lavc/htmlsubtitles: handle colors starting with many '#'
[ffmpeg.git] / libavcodec / exr.c
index cc0995c..7598807 100644 (file)
@@ -1,7 +1,10 @@
 /*
  * OpenEXR (.exr) image decoder
+ * Copyright (c) 2006 Industrial Light & Magic, a division of Lucas Digital Ltd. LLC
  * Copyright (c) 2009 Jimmy Christensen
  *
+ * B44/B44A, Tile, UINT32 added by Jokyo Images support by CNC - French National Center for Cinema
+ *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * For more information on the OpenEXR format, visit:
  *  http://openexr.com/
  *
- * exr_flt2uint() and exr_halflt2uint() is credited to  Reimar Döffinger
+ * exr_flt2uint() and exr_halflt2uint() is credited to Reimar Döffinger.
+ * exr_half2float() is credited to Aaftab Munshi, Dan Ginsburg, Dave Shreiner.
  */
 
+#include <float.h>
 #include <zlib.h>
 
+#include "libavutil/avassert.h"
+#include "libavutil/common.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/intfloat.h"
+#include "libavutil/opt.h"
+#include "libavutil/color_utils.h"
+
 #include "avcodec.h"
 #include "bytestream.h"
+
+#if HAVE_BIGENDIAN
+#include "bswapdsp.h"
+#endif
+
+#include "get_bits.h"
+#include "internal.h"
 #include "mathops.h"
 #include "thread.h"
-#include "libavutil/imgutils.h"
-#include "libavutil/avassert.h"
 
 enum ExrCompr {
-    EXR_RAW   = 0,
-    EXR_RLE   = 1,
-    EXR_ZIP1  = 2,
-    EXR_ZIP16 = 3,
-    EXR_PIZ   = 4,
-    EXR_PXR24 = 5,
-    EXR_B44   = 6,
-    EXR_B44A  = 7,
+    EXR_RAW,
+    EXR_RLE,
+    EXR_ZIP1,
+    EXR_ZIP16,
+    EXR_PIZ,
+    EXR_PXR24,
+    EXR_B44,
+    EXR_B44A,
+    EXR_DWA,
+    EXR_DWB,
+    EXR_UNKN,
 };
 
 enum ExrPixelType {
     EXR_UINT,
     EXR_HALF,
-    EXR_FLOAT
+    EXR_FLOAT,
+    EXR_UNKNOWN,
+};
+
+enum ExrTileLevelMode {
+    EXR_TILE_LEVEL_ONE,
+    EXR_TILE_LEVEL_MIPMAP,
+    EXR_TILE_LEVEL_RIPMAP,
+    EXR_TILE_LEVEL_UNKNOWN,
+};
+
+enum ExrTileLevelRound {
+    EXR_TILE_ROUND_UP,
+    EXR_TILE_ROUND_DOWN,
+    EXR_TILE_ROUND_UNKNOWN,
 };
 
 typedef struct EXRChannel {
-    int               xsub, ysub;
+    int xsub, ysub;
     enum ExrPixelType pixel_type;
 } EXRChannel;
 
+typedef struct EXRTileAttribute {
+    int32_t xSize;
+    int32_t ySize;
+    enum ExrTileLevelMode level_mode;
+    enum ExrTileLevelRound level_round;
+} EXRTileAttribute;
+
 typedef struct EXRThreadData {
     uint8_t *uncompressed_data;
     int uncompressed_size;
 
     uint8_t *tmp;
     int tmp_size;
+
+    uint8_t *bitmap;
+    uint16_t *lut;
+
+    int ysize, xsize;
+
+    int channel_line_size;
 } EXRThreadData;
 
 typedef struct EXRContext {
+    AVClass *class;
     AVFrame *picture;
-    int compr;
+    AVCodecContext *avctx;
+
+#if HAVE_BIGENDIAN
+    BswapDSPContext bbdsp;
+#endif
+
+    enum ExrCompr compression;
     enum ExrPixelType pixel_type;
     int channel_offsets[4]; // 0 = red, 1 = green, 2 = blue and 3 = alpha
     const AVPixFmtDescriptor *desc;
 
+    int w, h;
     uint32_t xmax, xmin;
     uint32_t ymax, ymin;
     uint32_t xdelta, ydelta;
 
-    int ysize;
-
-    uint64_t scan_line_size;
     int scan_lines_per_block;
 
-    const uint8_t *buf, *table;
+    EXRTileAttribute tile_attr; /* header data attribute of tile */
+    int is_tile; /* 0 if scanline, 1 if tile */
+
+    int is_luma;/* 1 if there is an Y plane */
+
+    GetByteContext gb;
+    const uint8_t *buf;
     int buf_size;
 
     EXRChannel *channels;
     int nb_channels;
+    int current_channel_offset;
 
     EXRThreadData *thread_data;
-    int thread_data_size;
+
+    const char *layer;
+
+    enum AVColorTransferCharacteristic apply_trc_type;
+    float gamma;
+    uint16_t gamma_table[65536];
 } EXRContext;
 
+/* -15 stored using a single precision bias of 127 */
+#define HALF_FLOAT_MIN_BIASED_EXP_AS_SINGLE_FP_EXP 0x38000000
+
+/* max exponent value in single precision that will be converted
+ * to Inf or Nan when stored as a half-float */
+#define HALF_FLOAT_MAX_BIASED_EXP_AS_SINGLE_FP_EXP 0x47800000
+
+/* 255 is the max exponent biased value */
+#define FLOAT_MAX_BIASED_EXP (0xFF << 23)
+
+#define HALF_FLOAT_MAX_BIASED_EXP (0x1F << 10)
+
+/**
+ * Convert a half float as a uint16_t into a full float.
+ *
+ * @param hf half float as uint16_t
+ *
+ * @return float value
+ */
+static union av_intfloat32 exr_half2float(uint16_t hf)
+{
+    unsigned int sign = (unsigned int) (hf >> 15);
+    unsigned int mantissa = (unsigned int) (hf & ((1 << 10) - 1));
+    unsigned int exp = (unsigned int) (hf & HALF_FLOAT_MAX_BIASED_EXP);
+    union av_intfloat32 f;
+
+    if (exp == HALF_FLOAT_MAX_BIASED_EXP) {
+        // we have a half-float NaN or Inf
+        // half-float NaNs will be converted to a single precision NaN
+        // half-float Infs will be converted to a single precision Inf
+        exp = FLOAT_MAX_BIASED_EXP;
+        if (mantissa)
+            mantissa = (1 << 23) - 1;    // set all bits to indicate a NaN
+    } else if (exp == 0x0) {
+        // convert half-float zero/denorm to single precision value
+        if (mantissa) {
+            mantissa <<= 1;
+            exp = HALF_FLOAT_MIN_BIASED_EXP_AS_SINGLE_FP_EXP;
+            // check for leading 1 in denorm mantissa
+            while ((mantissa & (1 << 10))) {
+                // for every leading 0, decrement single precision exponent by 1
+                // and shift half-float mantissa value to the left
+                mantissa <<= 1;
+                exp -= (1 << 23);
+            }
+            // clamp the mantissa to 10 bits
+            mantissa &= ((1 << 10) - 1);
+            // shift left to generate single-precision mantissa of 23 bits
+            mantissa <<= 13;
+        }
+    } else {
+        // shift left to generate single-precision mantissa of 23 bits
+        mantissa <<= 13;
+        // generate single precision biased exponent value
+        exp = (exp << 13) + HALF_FLOAT_MIN_BIASED_EXP_AS_SINGLE_FP_EXP;
+    }
+
+    f.i = (sign << 31) | exp | mantissa;
+
+    return f;
+}
+
+
 /**
- * Converts from 32-bit float as uint32_t to uint16_t
+ * Convert from 32-bit float as uint32_t to uint16_t.
  *
  * @param v 32-bit float
+ *
  * @return normalized 16-bit unsigned int
  */
-static inline uint16_t exr_flt2uint(uint32_t v)
+static inline uint16_t exr_flt2uint(int32_t v)
 {
-    unsigned int exp = v >> 23;
+    int32_t exp = v >> 23;
     // "HACK": negative values result in exp<  0, so clipping them to 0
     // is also handled by this condition, avoids explicit check for sign bit.
-    if (exp<= 127 + 7 - 24) // we would shift out all bits anyway
+    if (exp <= 127 + 7 - 24) // we would shift out all bits anyway
         return 0;
     if (exp >= 127)
         return 0xffff;
@@ -115,83 +244,32 @@ static inline uint16_t exr_flt2uint(uint32_t v)
 }
 
 /**
- * Converts from 16-bit float as uint16_t to uint16_t
+ * Convert from 16-bit float as uint16_t to uint16_t.
  *
  * @param v 16-bit float
+ *
  * @return normalized 16-bit unsigned int
  */
 static inline uint16_t exr_halflt2uint(uint16_t v)
 {
     unsigned exp = 14 - (v >> 10);
     if (exp >= 14) {
-        if (exp == 14) return (v >> 9) & 1;
-        else           return (v & 0x8000) ? 0 : 0xffff;
+        if (exp == 14)
+            return (v >> 9) & 1;
+        else
+            return (v & 0x8000) ? 0 : 0xffff;
     }
     v <<= 6;
     return (v + (1 << 16)) >> (exp + 1);
 }
 
-/**
- * Gets the size of the header variable
- *
- * @param **buf the current pointer location in the header where
- * the variable data starts
- * @param *buf_end pointer location of the end of the buffer
- * @return size of variable data
- */
-static unsigned int get_header_variable_length(const uint8_t **buf,
-                                               const uint8_t *buf_end)
-{
-    unsigned int variable_buffer_data_size = bytestream_get_le32(buf);
-    if (variable_buffer_data_size >= buf_end - *buf)
-        return 0;
-    return variable_buffer_data_size;
-}
-
-/**
- * Checks if the variable name corresponds with it's data type
- *
- * @param *avctx the AVCodecContext
- * @param **buf the current pointer location in the header where
- * the variable name starts
- * @param *buf_end pointer location of the end of the buffer
- * @param *value_name name of the varible to check
- * @param *value_type type of the varible to check
- * @param minimum_length minimum length of the variable data
- * @param variable_buffer_data_size variable length read from the header
- * after it's checked
- * @return negative if variable is invalid
- */
-static int check_header_variable(AVCodecContext *avctx,
-                                              const uint8_t **buf,
-                                              const uint8_t *buf_end,
-                                              const char *value_name,
-                                              const char *value_type,
-                                              unsigned int minimum_length,
-                                              unsigned int *variable_buffer_data_size)
-{
-    if (buf_end - *buf >= minimum_length && !strcmp(*buf, value_name)) {
-        *buf += strlen(value_name)+1;
-        if (!strcmp(*buf, value_type)) {
-            *buf += strlen(value_type)+1;
-            *variable_buffer_data_size = get_header_variable_length(buf, buf_end);
-            if (!*variable_buffer_data_size)
-                av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
-            return 1;
-        }
-        *buf -= strlen(value_name)+1;
-        av_log(avctx, AV_LOG_WARNING, "Unknown data type for header variable %s\n", value_name);
-    }
-    return -1;
-}
-
 static void predictor(uint8_t *src, int size)
 {
-    uint8_t *t = src + 1;
+    uint8_t *t    = src + 1;
     uint8_t *stop = src + size;
 
     while (t < stop) {
-        int d = (int)t[-1] + (int)t[0] - 128;
+        int d = (int) t[-1] + (int) t[0] - 128;
         t[0] = d;
         ++t;
     }
@@ -199,21 +277,17 @@ static void predictor(uint8_t *src, int size)
 
 static void reorder_pixels(uint8_t *src, uint8_t *dst, int size)
 {
-    const int8_t *t1 = src;
-    const int8_t *t2 = src + (size + 1) / 2;
-    int8_t *s = dst;
-    int8_t *stop = s + size;
-
-    while (1) {
-        if (s < stop)
-            *(s++) = *(t1++);
-        else
-            break;
+    const uint8_t *t1 = src;
+    int half_size     = size / 2;
+    const uint8_t *t2 = src + half_size;
+    uint8_t *s        = dst;
+    int i;
 
-        if (s < stop)
-            *(s++) = *(t2++);
-        else
-            break;
+    av_assert1(size % 2 == 0);
+
+    for (i = 0; i < half_size; i++) {
+        *(s++) = *(t1++);
+        *(s++) = *(t2++);
     }
 }
 
@@ -224,7 +298,7 @@ static int zip_uncompress(const uint8_t *src, int compressed_size,
 
     if (uncompress(td->tmp, &dest_len, src, compressed_size) != Z_OK ||
         dest_len != uncompressed_size)
-        return AVERROR(EINVAL);
+        return AVERROR_INVALIDDATA;
 
     predictor(td->tmp, uncompressed_size);
     reorder_pixels(td->tmp, td->uncompressed_data, uncompressed_size);
@@ -235,11 +309,11 @@ static int zip_uncompress(const uint8_t *src, int compressed_size,
 static int rle_uncompress(const uint8_t *src, int compressed_size,
                           int uncompressed_size, EXRThreadData *td)
 {
-    int8_t *d = (int8_t *)td->tmp;
-    const int8_t *s = (const int8_t *)src;
-    int ssize = compressed_size;
-    int dsize = uncompressed_size;
-    int8_t *dend = d + dsize;
+    uint8_t *d      = td->tmp;
+    const int8_t *s = src;
+    int ssize       = compressed_size;
+    int dsize       = uncompressed_size;
+    uint8_t *dend   = d + dsize;
     int count;
 
     while (ssize > 0) {
@@ -248,9 +322,9 @@ static int rle_uncompress(const uint8_t *src, int compressed_size,
         if (count < 0) {
             count = -count;
 
-            if ((dsize -= count    ) < 0 ||
+            if ((dsize -= count) < 0 ||
                 (ssize -= count + 1) < 0)
-                return -1;
+                return AVERROR_INVALIDDATA;
 
             while (count--)
                 *d++ = *s++;
@@ -258,8 +332,8 @@ static int rle_uncompress(const uint8_t *src, int compressed_size,
             count++;
 
             if ((dsize -= count) < 0 ||
-                (ssize -= 2    ) < 0)
-                return -1;
+                (ssize -= 2) < 0)
+                return AVERROR_INVALIDDATA;
 
             while (count--)
                 *d++ = *s;
@@ -277,21 +351,519 @@ static int rle_uncompress(const uint8_t *src, int compressed_size,
     return 0;
 }
 
+#define USHORT_RANGE (1 << 16)
+#define BITMAP_SIZE  (1 << 13)
+
+static uint16_t reverse_lut(const uint8_t *bitmap, uint16_t *lut)
+{
+    int i, k = 0;
+
+    for (i = 0; i < USHORT_RANGE; i++)
+        if ((i == 0) || (bitmap[i >> 3] & (1 << (i & 7))))
+            lut[k++] = i;
+
+    i = k - 1;
+
+    memset(lut + k, 0, (USHORT_RANGE - k) * 2);
+
+    return i;
+}
+
+static void apply_lut(const uint16_t *lut, uint16_t *dst, int dsize)
+{
+    int i;
+
+    for (i = 0; i < dsize; ++i)
+        dst[i] = lut[dst[i]];
+}
+
+#define HUF_ENCBITS 16  // literal (value) bit length
+#define HUF_DECBITS 14  // decoding bit size (>= 8)
+
+#define HUF_ENCSIZE ((1 << HUF_ENCBITS) + 1)  // encoding table size
+#define HUF_DECSIZE (1 << HUF_DECBITS)        // decoding table size
+#define HUF_DECMASK (HUF_DECSIZE - 1)
+
+typedef struct HufDec {
+    int len;
+    int lit;
+    int *p;
+} HufDec;
+
+static void huf_canonical_code_table(uint64_t *hcode)
+{
+    uint64_t c, n[59] = { 0 };
+    int i;
+
+    for (i = 0; i < HUF_ENCSIZE; ++i)
+        n[hcode[i]] += 1;
+
+    c = 0;
+    for (i = 58; i > 0; --i) {
+        uint64_t nc = ((c + n[i]) >> 1);
+        n[i] = c;
+        c    = nc;
+    }
+
+    for (i = 0; i < HUF_ENCSIZE; ++i) {
+        int l = hcode[i];
+
+        if (l > 0)
+            hcode[i] = l | (n[l]++ << 6);
+    }
+}
+
+#define SHORT_ZEROCODE_RUN  59
+#define LONG_ZEROCODE_RUN   63
+#define SHORTEST_LONG_RUN   (2 + LONG_ZEROCODE_RUN - SHORT_ZEROCODE_RUN)
+#define LONGEST_LONG_RUN    (255 + SHORTEST_LONG_RUN)
+
+static int huf_unpack_enc_table(GetByteContext *gb,
+                                int32_t im, int32_t iM, uint64_t *hcode)
+{
+    GetBitContext gbit;
+    int ret = init_get_bits8(&gbit, gb->buffer, bytestream2_get_bytes_left(gb));
+    if (ret < 0)
+        return ret;
+
+    for (; im <= iM; im++) {
+        uint64_t l = hcode[im] = get_bits(&gbit, 6);
+
+        if (l == LONG_ZEROCODE_RUN) {
+            int zerun = get_bits(&gbit, 8) + SHORTEST_LONG_RUN;
+
+            if (im + zerun > iM + 1)
+                return AVERROR_INVALIDDATA;
+
+            while (zerun--)
+                hcode[im++] = 0;
+
+            im--;
+        } else if (l >= SHORT_ZEROCODE_RUN) {
+            int zerun = l - SHORT_ZEROCODE_RUN + 2;
+
+            if (im + zerun > iM + 1)
+                return AVERROR_INVALIDDATA;
+
+            while (zerun--)
+                hcode[im++] = 0;
+
+            im--;
+        }
+    }
+
+    bytestream2_skip(gb, (get_bits_count(&gbit) + 7) / 8);
+    huf_canonical_code_table(hcode);
+
+    return 0;
+}
+
+static int huf_build_dec_table(const uint64_t *hcode, int im,
+                               int iM, HufDec *hdecod)
+{
+    for (; im <= iM; im++) {
+        uint64_t c = hcode[im] >> 6;
+        int i, l = hcode[im] & 63;
+
+        if (c >> l)
+            return AVERROR_INVALIDDATA;
+
+        if (l > HUF_DECBITS) {
+            HufDec *pl = hdecod + (c >> (l - HUF_DECBITS));
+            if (pl->len)
+                return AVERROR_INVALIDDATA;
+
+            pl->lit++;
+
+            pl->p = av_realloc(pl->p, pl->lit * sizeof(int));
+            if (!pl->p)
+                return AVERROR(ENOMEM);
+
+            pl->p[pl->lit - 1] = im;
+        } else if (l) {
+            HufDec *pl = hdecod + (c << (HUF_DECBITS - l));
+
+            for (i = 1 << (HUF_DECBITS - l); i > 0; i--, pl++) {
+                if (pl->len || pl->p)
+                    return AVERROR_INVALIDDATA;
+                pl->len = l;
+                pl->lit = im;
+            }
+        }
+    }
+
+    return 0;
+}
+
+#define get_char(c, lc, gb)                                                   \
+{                                                                             \
+        c   = (c << 8) | bytestream2_get_byte(gb);                            \
+        lc += 8;                                                              \
+}
+
+#define get_code(po, rlc, c, lc, gb, out, oe, outb)                           \
+{                                                                             \
+        if (po == rlc) {                                                      \
+            if (lc < 8)                                                       \
+                get_char(c, lc, gb);                                          \
+            lc -= 8;                                                          \
+                                                                              \
+            cs = c >> lc;                                                     \
+                                                                              \
+            if (out + cs > oe || out == outb)                                 \
+                return AVERROR_INVALIDDATA;                                   \
+                                                                              \
+            s = out[-1];                                                      \
+                                                                              \
+            while (cs-- > 0)                                                  \
+                *out++ = s;                                                   \
+        } else if (out < oe) {                                                \
+            *out++ = po;                                                      \
+        } else {                                                              \
+            return AVERROR_INVALIDDATA;                                       \
+        }                                                                     \
+}
+
+static int huf_decode(const uint64_t *hcode, const HufDec *hdecod,
+                      GetByteContext *gb, int nbits,
+                      int rlc, int no, uint16_t *out)
+{
+    uint64_t c        = 0;
+    uint16_t *outb    = out;
+    uint16_t *oe      = out + no;
+    const uint8_t *ie = gb->buffer + (nbits + 7) / 8; // input byte size
+    uint8_t cs;
+    uint16_t s;
+    int i, lc = 0;
+
+    while (gb->buffer < ie) {
+        get_char(c, lc, gb);
+
+        while (lc >= HUF_DECBITS) {
+            const HufDec pl = hdecod[(c >> (lc - HUF_DECBITS)) & HUF_DECMASK];
+
+            if (pl.len) {
+                lc -= pl.len;
+                get_code(pl.lit, rlc, c, lc, gb, out, oe, outb);
+            } else {
+                int j;
+
+                if (!pl.p)
+                    return AVERROR_INVALIDDATA;
+
+                for (j = 0; j < pl.lit; j++) {
+                    int l = hcode[pl.p[j]] & 63;
+
+                    while (lc < l && bytestream2_get_bytes_left(gb) > 0)
+                        get_char(c, lc, gb);
+
+                    if (lc >= l) {
+                        if ((hcode[pl.p[j]] >> 6) ==
+                            ((c >> (lc - l)) & ((1LL << l) - 1))) {
+                            lc -= l;
+                            get_code(pl.p[j], rlc, c, lc, gb, out, oe, outb);
+                            break;
+                        }
+                    }
+                }
+
+                if (j == pl.lit)
+                    return AVERROR_INVALIDDATA;
+            }
+        }
+    }
+
+    i   = (8 - nbits) & 7;
+    c >>= i;
+    lc -= i;
+
+    while (lc > 0) {
+        const HufDec pl = hdecod[(c << (HUF_DECBITS - lc)) & HUF_DECMASK];
+
+        if (pl.len) {
+            lc -= pl.len;
+            get_code(pl.lit, rlc, c, lc, gb, out, oe, outb);
+        } else {
+            return AVERROR_INVALIDDATA;
+        }
+    }
+
+    if (out - outb != no)
+        return AVERROR_INVALIDDATA;
+    return 0;
+}
+
+static int huf_uncompress(GetByteContext *gb,
+                          uint16_t *dst, int dst_size)
+{
+    int32_t src_size, im, iM;
+    uint32_t nBits;
+    uint64_t *freq;
+    HufDec *hdec;
+    int ret, i;
+
+    src_size = bytestream2_get_le32(gb);
+    im       = bytestream2_get_le32(gb);
+    iM       = bytestream2_get_le32(gb);
+    bytestream2_skip(gb, 4);
+    nBits = bytestream2_get_le32(gb);
+    if (im < 0 || im >= HUF_ENCSIZE ||
+        iM < 0 || iM >= HUF_ENCSIZE ||
+        src_size < 0)
+        return AVERROR_INVALIDDATA;
+
+    bytestream2_skip(gb, 4);
+
+    freq = av_mallocz_array(HUF_ENCSIZE, sizeof(*freq));
+    hdec = av_mallocz_array(HUF_DECSIZE, sizeof(*hdec));
+    if (!freq || !hdec) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    if ((ret = huf_unpack_enc_table(gb, im, iM, freq)) < 0)
+        goto fail;
+
+    if (nBits > 8 * bytestream2_get_bytes_left(gb)) {
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    if ((ret = huf_build_dec_table(freq, im, iM, hdec)) < 0)
+        goto fail;
+    ret = huf_decode(freq, hdec, gb, nBits, iM, dst_size, dst);
+
+fail:
+    for (i = 0; i < HUF_DECSIZE; i++)
+        if (hdec)
+            av_freep(&hdec[i].p);
+
+    av_free(freq);
+    av_free(hdec);
+
+    return ret;
+}
+
+static inline void wdec14(uint16_t l, uint16_t h, uint16_t *a, uint16_t *b)
+{
+    int16_t ls = l;
+    int16_t hs = h;
+    int hi     = hs;
+    int ai     = ls + (hi & 1) + (hi >> 1);
+    int16_t as = ai;
+    int16_t bs = ai - hi;
+
+    *a = as;
+    *b = bs;
+}
+
+#define NBITS      16
+#define A_OFFSET  (1 << (NBITS - 1))
+#define MOD_MASK  ((1 << NBITS) - 1)
+
+static inline void wdec16(uint16_t l, uint16_t h, uint16_t *a, uint16_t *b)
+{
+    int m  = l;
+    int d  = h;
+    int bb = (m - (d >> 1)) & MOD_MASK;
+    int aa = (d + bb - A_OFFSET) & MOD_MASK;
+    *b = bb;
+    *a = aa;
+}
+
+static void wav_decode(uint16_t *in, int nx, int ox,
+                       int ny, int oy, uint16_t mx)
+{
+    int w14 = (mx < (1 << 14));
+    int n   = (nx > ny) ? ny : nx;
+    int p   = 1;
+    int p2;
+
+    while (p <= n)
+        p <<= 1;
+
+    p >>= 1;
+    p2  = p;
+    p >>= 1;
+
+    while (p >= 1) {
+        uint16_t *py = in;
+        uint16_t *ey = in + oy * (ny - p2);
+        uint16_t i00, i01, i10, i11;
+        int oy1 = oy * p;
+        int oy2 = oy * p2;
+        int ox1 = ox * p;
+        int ox2 = ox * p2;
+
+        for (; py <= ey; py += oy2) {
+            uint16_t *px = py;
+            uint16_t *ex = py + ox * (nx - p2);
+
+            for (; px <= ex; px += ox2) {
+                uint16_t *p01 = px + ox1;
+                uint16_t *p10 = px + oy1;
+                uint16_t *p11 = p10 + ox1;
+
+                if (w14) {
+                    wdec14(*px, *p10, &i00, &i10);
+                    wdec14(*p01, *p11, &i01, &i11);
+                    wdec14(i00, i01, px, p01);
+                    wdec14(i10, i11, p10, p11);
+                } else {
+                    wdec16(*px, *p10, &i00, &i10);
+                    wdec16(*p01, *p11, &i01, &i11);
+                    wdec16(i00, i01, px, p01);
+                    wdec16(i10, i11, p10, p11);
+                }
+            }
+
+            if (nx & p) {
+                uint16_t *p10 = px + oy1;
+
+                if (w14)
+                    wdec14(*px, *p10, &i00, p10);
+                else
+                    wdec16(*px, *p10, &i00, p10);
+
+                *px = i00;
+            }
+        }
+
+        if (ny & p) {
+            uint16_t *px = py;
+            uint16_t *ex = py + ox * (nx - p2);
+
+            for (; px <= ex; px += ox2) {
+                uint16_t *p01 = px + ox1;
+
+                if (w14)
+                    wdec14(*px, *p01, &i00, p01);
+                else
+                    wdec16(*px, *p01, &i00, p01);
+
+                *px = i00;
+            }
+        }
+
+        p2  = p;
+        p >>= 1;
+    }
+}
+
+static int piz_uncompress(EXRContext *s, const uint8_t *src, int ssize,
+                          int dsize, EXRThreadData *td)
+{
+    GetByteContext gb;
+    uint16_t maxval, min_non_zero, max_non_zero;
+    uint16_t *ptr;
+    uint16_t *tmp = (uint16_t *)td->tmp;
+    uint16_t *out;
+    uint16_t *in;
+    int ret, i, j;
+    int pixel_half_size;/* 1 for half, 2 for float and uint32 */
+    EXRChannel *channel;
+    int tmp_offset;
+
+    if (!td->bitmap)
+        td->bitmap = av_malloc(BITMAP_SIZE);
+    if (!td->lut)
+        td->lut = av_malloc(1 << 17);
+    if (!td->bitmap || !td->lut) {
+        av_freep(&td->bitmap);
+        av_freep(&td->lut);
+        return AVERROR(ENOMEM);
+    }
+
+    bytestream2_init(&gb, src, ssize);
+    min_non_zero = bytestream2_get_le16(&gb);
+    max_non_zero = bytestream2_get_le16(&gb);
+
+    if (max_non_zero >= BITMAP_SIZE)
+        return AVERROR_INVALIDDATA;
+
+    memset(td->bitmap, 0, FFMIN(min_non_zero, BITMAP_SIZE));
+    if (min_non_zero <= max_non_zero)
+        bytestream2_get_buffer(&gb, td->bitmap + min_non_zero,
+                               max_non_zero - min_non_zero + 1);
+    memset(td->bitmap + max_non_zero + 1, 0, BITMAP_SIZE - max_non_zero - 1);
+
+    maxval = reverse_lut(td->bitmap, td->lut);
+
+    ret = huf_uncompress(&gb, tmp, dsize / sizeof(uint16_t));
+    if (ret)
+        return ret;
+
+    ptr = tmp;
+    for (i = 0; i < s->nb_channels; i++) {
+        channel = &s->channels[i];
+
+        if (channel->pixel_type == EXR_HALF)
+            pixel_half_size = 1;
+        else
+            pixel_half_size = 2;
+
+        for (j = 0; j < pixel_half_size; j++)
+            wav_decode(ptr + j, td->xsize, pixel_half_size, td->ysize,
+                       td->xsize * pixel_half_size, maxval);
+        ptr += td->xsize * td->ysize * pixel_half_size;
+    }
+
+    apply_lut(td->lut, tmp, dsize / sizeof(uint16_t));
+
+    out = (uint16_t *)td->uncompressed_data;
+    for (i = 0; i < td->ysize; i++) {
+        tmp_offset = 0;
+        for (j = 0; j < s->nb_channels; j++) {
+            channel = &s->channels[j];
+            if (channel->pixel_type == EXR_HALF)
+                pixel_half_size = 1;
+            else
+                pixel_half_size = 2;
+
+            in = tmp + tmp_offset * td->xsize * td->ysize + i * td->xsize * pixel_half_size;
+            tmp_offset += pixel_half_size;
+
+#if HAVE_BIGENDIAN
+            s->bbdsp.bswap16_buf(out, in, td->xsize * pixel_half_size);
+#else
+            memcpy(out, in, td->xsize * 2 * pixel_half_size);
+#endif
+            out += td->xsize * pixel_half_size;
+        }
+    }
+
+    return 0;
+}
+
 static int pxr24_uncompress(EXRContext *s, const uint8_t *src,
                             int compressed_size, int uncompressed_size,
                             EXRThreadData *td)
 {
-    unsigned long dest_len = uncompressed_size;
+    unsigned long dest_len, expected_len = 0;
     const uint8_t *in = td->tmp;
     uint8_t *out;
     int c, i, j;
 
-    if (uncompress(td->tmp, &dest_len, src, compressed_size) != Z_OK ||
-        dest_len != uncompressed_size)
-        return AVERROR(EINVAL);
+    for (i = 0; i < s->nb_channels; i++) {
+        if (s->channels[i].pixel_type == EXR_FLOAT) {
+            expected_len += (td->xsize * td->ysize * 3);/* PRX 24 store float in 24 bit instead of 32 */
+        } else if (s->channels[i].pixel_type == EXR_HALF) {
+            expected_len += (td->xsize * td->ysize * 2);
+        } else {//UINT 32
+            expected_len += (td->xsize * td->ysize * 4);
+        }
+    }
+
+    dest_len = expected_len;
+
+    if (uncompress(td->tmp, &dest_len, src, compressed_size) != Z_OK) {
+        return AVERROR_INVALIDDATA;
+    } else if (dest_len != expected_len) {
+        return AVERROR_INVALIDDATA;
+    }
 
     out = td->uncompressed_data;
-    for (i = 0; i < s->ysize; i++) {
+    for (i = 0; i < td->ysize; i++)
         for (c = 0; c < s->nb_channels; c++) {
             EXRChannel *channel = &s->channels[c];
             const uint8_t *ptr[4];
@@ -300,32 +872,175 @@ static int pxr24_uncompress(EXRContext *s, const uint8_t *src,
             switch (channel->pixel_type) {
             case EXR_FLOAT:
                 ptr[0] = in;
-                ptr[1] = ptr[0] + s->xdelta;
-                ptr[2] = ptr[1] + s->xdelta;
-                in = ptr[2] + s->xdelta;
+                ptr[1] = ptr[0] + td->xsize;
+                ptr[2] = ptr[1] + td->xsize;
+                in     = ptr[2] + td->xsize;
 
-                for (j = 0; j < s->xdelta; ++j) {
+                for (j = 0; j < td->xsize; ++j) {
                     uint32_t diff = (*(ptr[0]++) << 24) |
                                     (*(ptr[1]++) << 16) |
-                                    (*(ptr[2]++) <<  8);
+                                    (*(ptr[2]++) << 8);
                     pixel += diff;
                     bytestream_put_le32(&out, pixel);
                 }
                 break;
             case EXR_HALF:
                 ptr[0] = in;
-                ptr[1] = ptr[0] + s->xdelta;
-                in = ptr[1] + s->xdelta;
-                for (j = 0; j < s->xdelta; j++) {
+                ptr[1] = ptr[0] + td->xsize;
+                in     = ptr[1] + td->xsize;
+                for (j = 0; j < td->xsize; j++) {
                     uint32_t diff = (*(ptr[0]++) << 8) | *(ptr[1]++);
 
                     pixel += diff;
                     bytestream_put_le16(&out, pixel);
                 }
                 break;
+            case EXR_UINT:
+                ptr[0] = in;
+                ptr[1] = ptr[0] + s->xdelta;
+                ptr[2] = ptr[1] + s->xdelta;
+                ptr[3] = ptr[2] + s->xdelta;
+                in     = ptr[3] + s->xdelta;
+
+                for (j = 0; j < s->xdelta; ++j) {
+                    uint32_t diff = (*(ptr[0]++) << 24) |
+                    (*(ptr[1]++) << 16) |
+                    (*(ptr[2]++) << 8 ) |
+                    (*(ptr[3]++));
+                    pixel += diff;
+                    bytestream_put_le32(&out, pixel);
+                }
+                break;
             default:
-                av_assert1(0);
+                return AVERROR_INVALIDDATA;
+            }
+        }
+
+    return 0;
+}
+
+static void unpack_14(const uint8_t b[14], uint16_t s[16])
+{
+    unsigned short shift = (b[ 2] >> 2);
+    unsigned short bias = (0x20 << shift);
+    int i;
+
+    s[ 0] = (b[0] << 8) | b[1];
+
+    s[ 4] = s[ 0] + ((((b[ 2] << 4) | (b[ 3] >> 4)) & 0x3f) << shift) - bias;
+    s[ 8] = s[ 4] + ((((b[ 3] << 2) | (b[ 4] >> 6)) & 0x3f) << shift) - bias;
+    s[12] = s[ 8] +   ((b[ 4]                       & 0x3f) << shift) - bias;
+
+    s[ 1] = s[ 0] +   ((b[ 5] >> 2)                         << shift) - bias;
+    s[ 5] = s[ 4] + ((((b[ 5] << 4) | (b[ 6] >> 4)) & 0x3f) << shift) - bias;
+    s[ 9] = s[ 8] + ((((b[ 6] << 2) | (b[ 7] >> 6)) & 0x3f) << shift) - bias;
+    s[13] = s[12] +   ((b[ 7]                       & 0x3f) << shift) - bias;
+
+    s[ 2] = s[ 1] +   ((b[ 8] >> 2)                         << shift) - bias;
+    s[ 6] = s[ 5] + ((((b[ 8] << 4) | (b[ 9] >> 4)) & 0x3f) << shift) - bias;
+    s[10] = s[ 9] + ((((b[ 9] << 2) | (b[10] >> 6)) & 0x3f) << shift) - bias;
+    s[14] = s[13] +   ((b[10]                       & 0x3f) << shift) - bias;
+
+    s[ 3] = s[ 2] +   ((b[11] >> 2)                         << shift) - bias;
+    s[ 7] = s[ 6] + ((((b[11] << 4) | (b[12] >> 4)) & 0x3f) << shift) - bias;
+    s[11] = s[10] + ((((b[12] << 2) | (b[13] >> 6)) & 0x3f) << shift) - bias;
+    s[15] = s[14] +   ((b[13]                       & 0x3f) << shift) - bias;
+
+    for (i = 0; i < 16; ++i) {
+        if (s[i] & 0x8000)
+            s[i] &= 0x7fff;
+        else
+            s[i] = ~s[i];
+    }
+}
+
+static void unpack_3(const uint8_t b[3], uint16_t s[16])
+{
+    int i;
+
+    s[0] = (b[0] << 8) | b[1];
+
+    if (s[0] & 0x8000)
+        s[0] &= 0x7fff;
+    else
+        s[0] = ~s[0];
+
+    for (i = 1; i < 16; i++)
+        s[i] = s[0];
+}
+
+
+static int b44_uncompress(EXRContext *s, const uint8_t *src, int compressed_size,
+                          int uncompressed_size, EXRThreadData *td) {
+    const int8_t *sr = src;
+    int stay_to_uncompress = compressed_size;
+    int nb_b44_block_w, nb_b44_block_h;
+    int index_tl_x, index_tl_y, index_out, index_tmp;
+    uint16_t tmp_buffer[16]; /* B44 use 4x4 half float pixel */
+    int c, iY, iX, y, x;
+    int target_channel_offset = 0;
+
+    /* calc B44 block count */
+    nb_b44_block_w = td->xsize / 4;
+    if ((td->xsize % 4) != 0)
+        nb_b44_block_w++;
+
+    nb_b44_block_h = td->ysize / 4;
+    if ((td->ysize % 4) != 0)
+        nb_b44_block_h++;
+
+    for (c = 0; c < s->nb_channels; c++) {
+        if (s->channels[c].pixel_type == EXR_HALF) {/* B44 only compress half float data */
+            for (iY = 0; iY < nb_b44_block_h; iY++) {
+                for (iX = 0; iX < nb_b44_block_w; iX++) {/* For each B44 block */
+                    if (stay_to_uncompress < 3) {
+                        av_log(s, AV_LOG_ERROR, "Not enough data for B44A block: %d", stay_to_uncompress);
+                        return AVERROR_INVALIDDATA;
+                    }
+
+                    if (src[compressed_size - stay_to_uncompress + 2] == 0xfc) { /* B44A block */
+                        unpack_3(sr, tmp_buffer);
+                        sr += 3;
+                        stay_to_uncompress -= 3;
+                    }  else {/* B44 Block */
+                        if (stay_to_uncompress < 14) {
+                            av_log(s, AV_LOG_ERROR, "Not enough data for B44 block: %d", stay_to_uncompress);
+                            return AVERROR_INVALIDDATA;
+                        }
+                        unpack_14(sr, tmp_buffer);
+                        sr += 14;
+                        stay_to_uncompress -= 14;
+                    }
+
+                    /* copy data to uncompress buffer (B44 block can exceed target resolution)*/
+                    index_tl_x = iX * 4;
+                    index_tl_y = iY * 4;
+
+                    for (y = index_tl_y; y < FFMIN(index_tl_y + 4, td->ysize); y++) {
+                        for (x = index_tl_x; x < FFMIN(index_tl_x + 4, td->xsize); x++) {
+                            index_out = target_channel_offset * td->xsize + y * td->channel_line_size + 2 * x;
+                            index_tmp = (y-index_tl_y) * 4 + (x-index_tl_x);
+                            td->uncompressed_data[index_out] = tmp_buffer[index_tmp] & 0xff;
+                            td->uncompressed_data[index_out + 1] = tmp_buffer[index_tmp] >> 8;
+                        }
+                    }
+                }
+            }
+            target_channel_offset += 2;
+        } else {/* Float or UINT 32 channel */
+            if (stay_to_uncompress < td->ysize * td->xsize * 4) {
+                av_log(s, AV_LOG_ERROR, "Not enough data for uncompress channel: %d", stay_to_uncompress);
+                return AVERROR_INVALIDDATA;
             }
+
+            for (y = 0; y < td->ysize; y++) {
+                index_out = target_channel_offset * td->xsize + y * td->channel_line_size;
+                memcpy(&td->uncompressed_data[index_out], sr, td->xsize * 4);
+                sr += td->xsize * 4;
+            }
+            target_channel_offset += 4;
+
+            stay_to_uncompress -= td->ysize * td->xsize * 4;
         }
     }
 
@@ -341,369 +1056,645 @@ static int decode_block(AVCodecContext *avctx, void *tdata,
     const uint8_t *channel_buffer[4] = { 0 };
     const uint8_t *buf = s->buf;
     uint64_t line_offset, uncompressed_size;
-    uint32_t xdelta = s->xdelta;
     uint16_t *ptr_x;
     uint8_t *ptr;
-    int32_t data_size, line;
+    uint32_t data_size;
+    uint64_t line, col = 0;
+    uint64_t tile_x, tile_y, tile_level_x, tile_level_y;
     const uint8_t *src;
-    int axmax = (avctx->width - (s->xmax + 1)) * 2 * s->desc->nb_components;
-    int bxmin = s->xmin * 2 * s->desc->nb_components;
-    int ret, i, x, buf_size = s->buf_size;
+    int axmax = (avctx->width - (s->xmax + 1)) * 2 * s->desc->nb_components; /* nb pixel to add at the right of the datawindow */
+    int bxmin = s->xmin * 2 * s->desc->nb_components; /* nb pixel to add at the left of the datawindow */
+    int i, x, buf_size = s->buf_size;
+    int c, rgb_channel_count;
+    float one_gamma = 1.0f / s->gamma;
+    avpriv_trc_function trc_func = avpriv_get_trc_function_from_trc(s->apply_trc_type);
+    int ret;
+
+    line_offset = AV_RL64(s->gb.buffer + jobnr * 8);
+
+    if (s->is_tile) {
+        if (line_offset > buf_size - 20)
+            return AVERROR_INVALIDDATA;
 
-    line_offset = AV_RL64(s->table + jobnr * 8);
-    // Check if the buffer has the required bytes needed from the offset
-    if (line_offset > buf_size - 8)
-        return AVERROR_INVALIDDATA;
+        src  = buf + line_offset + 20;
 
-    src = buf + line_offset + 8;
-    line = AV_RL32(src - 8);
-    if (line < s->ymin || line > s->ymax)
-        return AVERROR_INVALIDDATA;
+        tile_x = AV_RL32(src - 20);
+        tile_y = AV_RL32(src - 16);
+        tile_level_x = AV_RL32(src - 12);
+        tile_level_y = AV_RL32(src - 8);
 
-    data_size = AV_RL32(src - 4);
-    if (data_size <= 0 || data_size > buf_size)
-        return AVERROR_INVALIDDATA;
+        data_size = AV_RL32(src - 4);
+        if (data_size <= 0 || data_size > buf_size)
+            return AVERROR_INVALIDDATA;
 
-    s->ysize = FFMIN(s->scan_lines_per_block, s->ymax - line + 1);
-    uncompressed_size = s->scan_line_size * s->ysize;
-    if ((s->compr == EXR_RAW && (data_size != uncompressed_size ||
-                                 line_offset > buf_size - uncompressed_size)) ||
-        (s->compr != EXR_RAW && (data_size > uncompressed_size ||
-                                 line_offset > buf_size - data_size))) {
-        return AVERROR_INVALIDDATA;
+        if (tile_level_x || tile_level_y) { /* tile level, is not the full res level */
+            avpriv_report_missing_feature(s->avctx, "Subres tile before full res tile");
+            return AVERROR_PATCHWELCOME;
+        }
+
+        if (s->xmin || s->ymin) {
+            avpriv_report_missing_feature(s->avctx, "Tiles with xmin/ymin");
+            return AVERROR_PATCHWELCOME;
+        }
+
+        line = s->tile_attr.ySize * tile_y;
+        col = s->tile_attr.xSize * tile_x;
+
+        if (line < s->ymin || line > s->ymax ||
+            col  < s->xmin || col  > s->xmax)
+            return AVERROR_INVALIDDATA;
+
+        td->ysize = FFMIN(s->tile_attr.ySize, s->ydelta - tile_y * s->tile_attr.ySize);
+        td->xsize = FFMIN(s->tile_attr.xSize, s->xdelta - tile_x * s->tile_attr.xSize);
+
+        if (col) { /* not the first tile of the line */
+            bxmin = 0; /* doesn't add pixel at the left of the datawindow */
+        }
+
+        if ((col + td->xsize) != s->xdelta)/* not the last tile of the line */
+            axmax = 0; /* doesn't add pixel at the right of the datawindow */
+
+        td->channel_line_size = td->xsize * s->current_channel_offset;/* uncompress size of one line */
+        uncompressed_size = td->channel_line_size * (uint64_t)td->ysize;/* uncompress size of the block */
+    } else {
+        if (line_offset > buf_size - 8)
+            return AVERROR_INVALIDDATA;
+
+        src  = buf + line_offset + 8;
+        line = AV_RL32(src - 8);
+
+        if (line < s->ymin || line > s->ymax)
+            return AVERROR_INVALIDDATA;
+
+        data_size = AV_RL32(src - 4);
+        if (data_size <= 0 || data_size > buf_size)
+            return AVERROR_INVALIDDATA;
+
+        td->ysize          = FFMIN(s->scan_lines_per_block, s->ymax - line + 1); /* s->ydelta - line ?? */
+        td->xsize          = s->xdelta;
+
+        td->channel_line_size = td->xsize * s->current_channel_offset;/* uncompress size of one line */
+        uncompressed_size = td->channel_line_size * (uint64_t)td->ysize;/* uncompress size of the block */
+
+        if ((s->compression == EXR_RAW && (data_size != uncompressed_size ||
+                                           line_offset > buf_size - uncompressed_size)) ||
+            (s->compression != EXR_RAW && (data_size > uncompressed_size ||
+                                           line_offset > buf_size - data_size))) {
+            return AVERROR_INVALIDDATA;
+        }
     }
 
-    if (data_size < uncompressed_size) {
-        av_fast_padded_malloc(&td->uncompressed_data, &td->uncompressed_size, uncompressed_size);
+    if (data_size < uncompressed_size || s->is_tile) { /* td->tmp is use for tile reorganization */
         av_fast_padded_malloc(&td->tmp, &td->tmp_size, uncompressed_size);
-        if (!td->uncompressed_data || !td->tmp)
+        if (!td->tmp)
+            return AVERROR(ENOMEM);
+    }
+
+    if (data_size < uncompressed_size) {
+        av_fast_padded_malloc(&td->uncompressed_data,
+                              &td->uncompressed_size, uncompressed_size);
+
+        if (!td->uncompressed_data)
             return AVERROR(ENOMEM);
 
-        switch (s->compr) {
+        ret = AVERROR_INVALIDDATA;
+        switch (s->compression) {
         case EXR_ZIP1:
         case EXR_ZIP16:
             ret = zip_uncompress(src, data_size, uncompressed_size, td);
             break;
+        case EXR_PIZ:
+            ret = piz_uncompress(s, src, data_size, uncompressed_size, td);
+            break;
         case EXR_PXR24:
             ret = pxr24_uncompress(s, src, data_size, uncompressed_size, td);
             break;
         case EXR_RLE:
             ret = rle_uncompress(src, data_size, uncompressed_size, td);
+            break;
+        case EXR_B44:
+        case EXR_B44A:
+            ret = b44_uncompress(s, src, data_size, uncompressed_size, td);
+            break;
+        }
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_ERROR, "decode_block() failed.\n");
+            return ret;
         }
-
         src = td->uncompressed_data;
     }
 
-    channel_buffer[0] = src + xdelta * s->channel_offsets[0];
-    channel_buffer[1] = src + xdelta * s->channel_offsets[1];
-    channel_buffer[2] = src + xdelta * s->channel_offsets[2];
+    if (!s->is_luma) {
+        channel_buffer[0] = src + td->xsize * s->channel_offsets[0];
+        channel_buffer[1] = src + td->xsize * s->channel_offsets[1];
+        channel_buffer[2] = src + td->xsize * s->channel_offsets[2];
+        rgb_channel_count = 3;
+    } else { /* put y data in the first channel_buffer */
+        channel_buffer[0] = src + td->xsize * s->channel_offsets[1];
+        rgb_channel_count = 1;
+    }
     if (s->channel_offsets[3] >= 0)
-        channel_buffer[3] = src + xdelta * s->channel_offsets[3];
+        channel_buffer[3] = src + td->xsize * s->channel_offsets[3];
+
+    ptr = p->data[0] + line * p->linesize[0] + (col * s->desc->nb_components * 2);
+
+    for (i = 0;
+         i < td->ysize; i++, ptr += p->linesize[0]) {
 
-    ptr = p->data[0] + line * p->linesize[0];
-    for (i = 0; i < s->scan_lines_per_block && line + i <= s->ymax; i++, ptr += p->linesize[0]) {
-        const uint8_t *r, *g, *b, *a;
+        const uint8_t * a;
+        const uint8_t *rgb[3];
+
+        for (c = 0; c < rgb_channel_count; c++){
+            rgb[c] = channel_buffer[c];
+        }
 
-        r = channel_buffer[0];
-        g = channel_buffer[1];
-        b = channel_buffer[2];
         if (channel_buffer[3])
             a = channel_buffer[3];
 
-        ptr_x = (uint16_t *)ptr;
+        ptr_x = (uint16_t *) ptr;
 
         // Zero out the start if xmin is not 0
         memset(ptr_x, 0, bxmin);
         ptr_x += s->xmin * s->desc->nb_components;
+
         if (s->pixel_type == EXR_FLOAT) {
             // 32-bit
-            for (x = 0; x < xdelta; x++) {
-                *ptr_x++ = exr_flt2uint(bytestream_get_le32(&r));
-                *ptr_x++ = exr_flt2uint(bytestream_get_le32(&g));
-                *ptr_x++ = exr_flt2uint(bytestream_get_le32(&b));
-                if (channel_buffer[3])
-                    *ptr_x++ = exr_flt2uint(bytestream_get_le32(&a));
+            if (trc_func) {
+                for (x = 0; x < td->xsize; x++) {
+                    union av_intfloat32 t;
+
+                    for (c = 0; c < rgb_channel_count; c++) {
+                        t.i = bytestream_get_le32(&rgb[c]);
+                        t.f = trc_func(t.f);
+                        *ptr_x++ = exr_flt2uint(t.i);
+                    }
+                    if (channel_buffer[3])
+                        *ptr_x++ = exr_flt2uint(bytestream_get_le32(&a));
+                }
+            } else {
+                for (x = 0; x < td->xsize; x++) {
+                    union av_intfloat32 t;
+                    int c;
+
+                    for (c = 0; c < rgb_channel_count; c++) {
+                        t.i = bytestream_get_le32(&rgb[c]);
+                        if (t.f > 0.0f)  /* avoid negative values */
+                            t.f = powf(t.f, one_gamma);
+                        *ptr_x++ = exr_flt2uint(t.i);
+                    }
+
+                    if (channel_buffer[3])
+                        *ptr_x++ = exr_flt2uint(bytestream_get_le32(&a));
+                }
             }
-        } else {
+        } else if (s->pixel_type == EXR_HALF) {
             // 16-bit
-            for (x = 0; x < xdelta; x++) {
-                *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&r));
-                *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&g));
-                *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&b));
+            for (x = 0; x < td->xsize; x++) {
+                int c;
+                for (c = 0; c < rgb_channel_count; c++) {
+                    *ptr_x++ = s->gamma_table[bytestream_get_le16(&rgb[c])];
+                }
+
                 if (channel_buffer[3])
                     *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&a));
             }
+        } else if (s->pixel_type == EXR_UINT) {
+            for (x = 0; x < td->xsize; x++) {
+                for (c = 0; c < rgb_channel_count; c++) {
+                    *ptr_x++ = bytestream_get_le32(&rgb[c]) >> 16;
+                }
+
+                if (channel_buffer[3])
+                    *ptr_x++ = bytestream_get_le32(&a) >> 16;
+            }
         }
 
         // Zero out the end if xmax+1 is not w
         memset(ptr_x, 0, axmax);
 
-        channel_buffer[0] += s->scan_line_size;
-        channel_buffer[1] += s->scan_line_size;
-        channel_buffer[2] += s->scan_line_size;
+        channel_buffer[0] += td->channel_line_size;
+        channel_buffer[1] += td->channel_line_size;
+        channel_buffer[2] += td->channel_line_size;
         if (channel_buffer[3])
-            channel_buffer[3] += s->scan_line_size;
+            channel_buffer[3] += td->channel_line_size;
     }
 
     return 0;
 }
 
-static int decode_frame(AVCodecContext *avctx,
-                        void *data,
-                        int *got_frame,
-                        AVPacket *avpkt)
+/**
+ * Check if the variable name corresponds to its data type.
+ *
+ * @param s              the EXRContext
+ * @param value_name     name of the variable to check
+ * @param value_type     type of the variable to check
+ * @param minimum_length minimum length of the variable data
+ *
+ * @return bytes to read containing variable data
+ *         -1 if variable is not found
+ *         0 if buffer ended prematurely
+ */
+static int check_header_variable(EXRContext *s,
+                                 const char *value_name,
+                                 const char *value_type,
+                                 unsigned int minimum_length)
 {
-    const uint8_t *buf      = avpkt->data;
-    unsigned int   buf_size = avpkt->size;
-    const uint8_t *buf_end  = buf + buf_size;
-
-    EXRContext *const s = avctx->priv_data;
-    ThreadFrame frame = { .f = data };
-    AVFrame *picture  = data;
-    uint8_t *ptr;
-
-    int i, y, magic_number, version, flags, ret;
-    int w = 0;
-    int h = 0;
-
-    int out_line_size;
-    int scan_line_blocks;
+    int var_size = -1;
+
+    if (bytestream2_get_bytes_left(&s->gb) >= minimum_length &&
+        !strcmp(s->gb.buffer, value_name)) {
+        // found value_name, jump to value_type (null terminated strings)
+        s->gb.buffer += strlen(value_name) + 1;
+        if (!strcmp(s->gb.buffer, value_type)) {
+            s->gb.buffer += strlen(value_type) + 1;
+            var_size = bytestream2_get_le32(&s->gb);
+            // don't go read past boundaries
+            if (var_size > bytestream2_get_bytes_left(&s->gb))
+                var_size = 0;
+        } else {
+            // value_type not found, reset the buffer
+            s->gb.buffer -= strlen(value_name) + 1;
+            av_log(s->avctx, AV_LOG_WARNING,
+                   "Unknown data type %s for header variable %s.\n",
+                   value_type, value_name);
+        }
+    }
 
-    unsigned int current_channel_offset = 0;
+    return var_size;
+}
 
-    s->xmin = ~0;
-    s->xmax = ~0;
-    s->ymin = ~0;
-    s->ymax = ~0;
-    s->xdelta = ~0;
-    s->ydelta = ~0;
+static int decode_header(EXRContext *s, AVFrame *frame)
+{
+    AVDictionary *metadata = NULL;
+    int magic_number, version, i, flags, sar = 0;
+    int layer_match = 0;
+
+    s->current_channel_offset = 0;
+    s->xmin               = ~0;
+    s->xmax               = ~0;
+    s->ymin               = ~0;
+    s->ymax               = ~0;
+    s->xdelta             = ~0;
+    s->ydelta             = ~0;
     s->channel_offsets[0] = -1;
     s->channel_offsets[1] = -1;
     s->channel_offsets[2] = -1;
     s->channel_offsets[3] = -1;
-    s->pixel_type = -1;
-    s->nb_channels = 0;
-    s->compr = -1;
-    s->buf = buf;
-    s->buf_size = buf_size;
-
-    if (buf_size < 10) {
-        av_log(avctx, AV_LOG_ERROR, "Too short header to parse\n");
+    s->pixel_type         = EXR_UNKNOWN;
+    s->compression        = EXR_UNKN;
+    s->nb_channels        = 0;
+    s->w                  = 0;
+    s->h                  = 0;
+    s->tile_attr.xSize    = -1;
+    s->tile_attr.ySize    = -1;
+    s->is_tile            = 0;
+    s->is_luma            = 0;
+
+    if (bytestream2_get_bytes_left(&s->gb) < 10) {
+        av_log(s->avctx, AV_LOG_ERROR, "Header too short to parse.\n");
         return AVERROR_INVALIDDATA;
     }
 
-    magic_number = bytestream_get_le32(&buf);
-    if (magic_number != 20000630) { // As per documentation of OpenEXR it's supposed to be int 20000630 little-endian
-        av_log(avctx, AV_LOG_ERROR, "Wrong magic number %d\n", magic_number);
+    magic_number = bytestream2_get_le32(&s->gb);
+    if (magic_number != 20000630) {
+        /* As per documentation of OpenEXR, it is supposed to be
+         * int 20000630 little-endian */
+        av_log(s->avctx, AV_LOG_ERROR, "Wrong magic number %d.\n", magic_number);
         return AVERROR_INVALIDDATA;
     }
 
-    version = bytestream_get_byte(&buf);
+    version = bytestream2_get_byte(&s->gb);
     if (version != 2) {
-        av_log(avctx, AV_LOG_ERROR, "Unsupported version %d\n", version);
+        avpriv_report_missing_feature(s->avctx, "Version %d", version);
         return AVERROR_PATCHWELCOME;
     }
 
-    flags = bytestream_get_le24(&buf);
-    if (flags & 0x2) {
-        av_log(avctx, AV_LOG_ERROR, "Tile based images are not supported\n");
+    flags = bytestream2_get_le24(&s->gb);
+
+    if (flags == 0x00)
+        s->is_tile = 0;
+    else if (flags & 0x02)
+        s->is_tile = 1;
+    else{
+        avpriv_report_missing_feature(s->avctx, "flags %d", flags);
         return AVERROR_PATCHWELCOME;
     }
 
     // Parse the header
-    while (buf < buf_end && buf[0]) {
-        unsigned int variable_buffer_data_size;
-        // Process the channel list
-        if (check_header_variable(avctx, &buf, buf_end, "channels", "chlist", 38, &variable_buffer_data_size) >= 0) {
-            const uint8_t *channel_list_end;
-            if (!variable_buffer_data_size)
+    while (bytestream2_get_bytes_left(&s->gb) > 0 && *s->gb.buffer) {
+        int var_size;
+        if ((var_size = check_header_variable(s, "channels",
+                                              "chlist", 38)) >= 0) {
+            GetByteContext ch_gb;
+            if (!var_size)
                 return AVERROR_INVALIDDATA;
 
-            channel_list_end = buf + variable_buffer_data_size;
-            while (channel_list_end - buf >= 19) {
+            bytestream2_init(&ch_gb, s->gb.buffer, var_size);
+
+            while (bytestream2_get_bytes_left(&ch_gb) >= 19) {
                 EXRChannel *channel;
-                int current_pixel_type = -1;
+                enum ExrPixelType current_pixel_type;
                 int channel_index = -1;
                 int xsub, ysub;
 
-                if (!strcmp(buf, "R"))
-                    channel_index = 0;
-                else if (!strcmp(buf, "G"))
-                    channel_index = 1;
-                else if (!strcmp(buf, "B"))
-                    channel_index = 2;
-                else if (!strcmp(buf, "A"))
-                    channel_index = 3;
-                else
-                    av_log(avctx, AV_LOG_WARNING, "Unsupported channel %.256s\n", buf);
+                if (strcmp(s->layer, "") != 0) {
+                    if (strncmp(ch_gb.buffer, s->layer, strlen(s->layer)) == 0) {
+                        layer_match = 1;
+                        av_log(s->avctx, AV_LOG_INFO,
+                               "Channel match layer : %s.\n", ch_gb.buffer);
+                        ch_gb.buffer += strlen(s->layer);
+                        if (*ch_gb.buffer == '.')
+                            ch_gb.buffer++;         /* skip dot if not given */
+                    } else {
+                        av_log(s->avctx, AV_LOG_INFO,
+                               "Channel doesn't match layer : %s.\n", ch_gb.buffer);
+                    }
+                } else {
+                    layer_match = 1;
+                }
+
+                if (layer_match) { /* only search channel if the layer match is valid */
+                    if (!strcmp(ch_gb.buffer, "R") ||
+                        !strcmp(ch_gb.buffer, "X") ||
+                        !strcmp(ch_gb.buffer, "U")) {
+                        channel_index = 0;
+                        s->is_luma = 0;
+                    } else if (!strcmp(ch_gb.buffer, "G") ||
+                               !strcmp(ch_gb.buffer, "V")) {
+                        channel_index = 1;
+                        s->is_luma = 0;
+                    } else if (!strcmp(ch_gb.buffer, "Y")) {
+                        channel_index = 1;
+                        s->is_luma = 1;
+                    } else if (!strcmp(ch_gb.buffer, "B") ||
+                               !strcmp(ch_gb.buffer, "Z") ||
+                               !strcmp(ch_gb.buffer, "W")){
+                               channel_index = 2;
+                        s->is_luma = 0;
+                    } else if (!strcmp(ch_gb.buffer, "A")) {
+                        channel_index = 3;
+                    } else {
+                        av_log(s->avctx, AV_LOG_WARNING,
+                               "Unsupported channel %.256s.\n", ch_gb.buffer);
+                    }
+                }
 
-                while (bytestream_get_byte(&buf) && buf < channel_list_end)
-                    continue; /* skip */
+                /* skip until you get a 0 */
+                while (bytestream2_get_bytes_left(&ch_gb) > 0 &&
+                       bytestream2_get_byte(&ch_gb))
+                    continue;
 
-                if (channel_list_end - * &buf < 4) {
-                    av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
+                if (bytestream2_get_bytes_left(&ch_gb) < 4) {
+                    av_log(s->avctx, AV_LOG_ERROR, "Incomplete header.\n");
                     return AVERROR_INVALIDDATA;
                 }
 
-                current_pixel_type = bytestream_get_le32(&buf);
-                if (current_pixel_type > 2) {
-                    av_log(avctx, AV_LOG_ERROR, "Unknown pixel type\n");
-                    return AVERROR_INVALIDDATA;
+                current_pixel_type = bytestream2_get_le32(&ch_gb);
+                if (current_pixel_type >= EXR_UNKNOWN) {
+                    avpriv_report_missing_feature(s->avctx, "Pixel type %d",
+                                                  current_pixel_type);
+                    return AVERROR_PATCHWELCOME;
                 }
 
-                buf += 4;
-                xsub = bytestream_get_le32(&buf);
-                ysub = bytestream_get_le32(&buf);
+                bytestream2_skip(&ch_gb, 4);
+                xsub = bytestream2_get_le32(&ch_gb);
+                ysub = bytestream2_get_le32(&ch_gb);
+
                 if (xsub != 1 || ysub != 1) {
-                    av_log(avctx, AV_LOG_ERROR, "Unsupported subsampling %dx%d\n", xsub, ysub);
+                    avpriv_report_missing_feature(s->avctx,
+                                                  "Subsampling %dx%d",
+                                                  xsub, ysub);
                     return AVERROR_PATCHWELCOME;
                 }
 
-                if (channel_index >= 0) {
-                    if (s->pixel_type != -1 && s->pixel_type != current_pixel_type) {
-                        av_log(avctx, AV_LOG_ERROR, "RGB channels not of the same depth\n");
+                if (channel_index >= 0 && s->channel_offsets[channel_index] == -1) { /* channel has not been previously assigned */
+                    if (s->pixel_type != EXR_UNKNOWN &&
+                        s->pixel_type != current_pixel_type) {
+                        av_log(s->avctx, AV_LOG_ERROR,
+                               "RGB channels not of the same depth.\n");
                         return AVERROR_INVALIDDATA;
                     }
-                    s->pixel_type = current_pixel_type;
-                    s->channel_offsets[channel_index] = current_channel_offset;
+                    s->pixel_type                     = current_pixel_type;
+                    s->channel_offsets[channel_index] = s->current_channel_offset;
                 }
 
-                s->channels = av_realloc_f(s->channels, ++s->nb_channels, sizeof(EXRChannel));
+                s->channels = av_realloc(s->channels,
+                                         ++s->nb_channels * sizeof(EXRChannel));
                 if (!s->channels)
                     return AVERROR(ENOMEM);
-                channel = &s->channels[s->nb_channels - 1];
+                channel             = &s->channels[s->nb_channels - 1];
                 channel->pixel_type = current_pixel_type;
-                channel->xsub = xsub;
-                channel->ysub = ysub;
+                channel->xsub       = xsub;
+                channel->ysub       = ysub;
 
-                current_channel_offset += 1 << current_pixel_type;
+                if (current_pixel_type == EXR_HALF) {
+                    s->current_channel_offset += 2;
+                } else {/* Float or UINT32 */
+                    s->current_channel_offset += 4;
+                }
             }
 
             /* Check if all channels are set with an offset or if the channels
              * are causing an overflow  */
-
-            if (FFMIN3(s->channel_offsets[0],
-                       s->channel_offsets[1],
-                       s->channel_offsets[2]) < 0) {
-                if (s->channel_offsets[0] < 0)
-                    av_log(avctx, AV_LOG_ERROR, "Missing red channel\n");
-                if (s->channel_offsets[1] < 0)
-                    av_log(avctx, AV_LOG_ERROR, "Missing green channel\n");
-                if (s->channel_offsets[2] < 0)
-                    av_log(avctx, AV_LOG_ERROR, "Missing blue channel\n");
-                return AVERROR_INVALIDDATA;
+            if (!s->is_luma){/* if we expected to have at least 3 channels */
+                if (FFMIN3(s->channel_offsets[0],
+                           s->channel_offsets[1],
+                           s->channel_offsets[2]) < 0) {
+                    if (s->channel_offsets[0] < 0)
+                        av_log(s->avctx, AV_LOG_ERROR, "Missing red channel.\n");
+                    if (s->channel_offsets[1] < 0)
+                        av_log(s->avctx, AV_LOG_ERROR, "Missing green channel.\n");
+                    if (s->channel_offsets[2] < 0)
+                        av_log(s->avctx, AV_LOG_ERROR, "Missing blue channel.\n");
+                    return AVERROR_INVALIDDATA;
+                }
             }
 
-            buf = channel_list_end;
+            // skip one last byte and update main gb
+            s->gb.buffer = ch_gb.buffer + 1;
             continue;
-        } else if (check_header_variable(avctx, &buf, buf_end, "dataWindow", "box2i", 31, &variable_buffer_data_size) >= 0) {
-            if (!variable_buffer_data_size)
+        } else if ((var_size = check_header_variable(s, "dataWindow", "box2i",
+                                                     31)) >= 0) {
+            if (!var_size)
                 return AVERROR_INVALIDDATA;
 
-            s->xmin = AV_RL32(buf);
-            s->ymin = AV_RL32(buf + 4);
-            s->xmax = AV_RL32(buf + 8);
-            s->ymax = AV_RL32(buf + 12);
+            s->xmin   = bytestream2_get_le32(&s->gb);
+            s->ymin   = bytestream2_get_le32(&s->gb);
+            s->xmax   = bytestream2_get_le32(&s->gb);
+            s->ymax   = bytestream2_get_le32(&s->gb);
             s->xdelta = (s->xmax - s->xmin) + 1;
             s->ydelta = (s->ymax - s->ymin) + 1;
 
-            buf += variable_buffer_data_size;
             continue;
-        } else if (check_header_variable(avctx, &buf, buf_end, "displayWindow", "box2i", 34, &variable_buffer_data_size) >= 0) {
-            if (!variable_buffer_data_size)
+        } else if ((var_size = check_header_variable(s, "displayWindow",
+                                                     "box2i", 34)) >= 0) {
+            if (!var_size)
                 return AVERROR_INVALIDDATA;
 
-            w = AV_RL32(buf + 8) + 1;
-            h = AV_RL32(buf + 12) + 1;
+            bytestream2_skip(&s->gb, 8);
+            s->w = bytestream2_get_le32(&s->gb) + 1;
+            s->h = bytestream2_get_le32(&s->gb) + 1;
 
-            buf += variable_buffer_data_size;
             continue;
-        } else if (check_header_variable(avctx, &buf, buf_end, "lineOrder", "lineOrder", 25, &variable_buffer_data_size) >= 0) {
-            if (!variable_buffer_data_size)
+        } else if ((var_size = check_header_variable(s, "lineOrder",
+                                                     "lineOrder", 25)) >= 0) {
+            int line_order;
+            if (!var_size)
                 return AVERROR_INVALIDDATA;
 
-            av_log(avctx, AV_LOG_DEBUG, "line order : %d\n", *buf);
-            if (*buf > 2) {
-                av_log(avctx, AV_LOG_ERROR, "Unknown line order\n");
+            line_order = bytestream2_get_byte(&s->gb);
+            av_log(s->avctx, AV_LOG_DEBUG, "line order: %d.\n", line_order);
+            if (line_order > 2) {
+                av_log(s->avctx, AV_LOG_ERROR, "Unknown line order.\n");
                 return AVERROR_INVALIDDATA;
             }
 
-            buf += variable_buffer_data_size;
             continue;
-        } else if (check_header_variable(avctx, &buf, buf_end, "pixelAspectRatio", "float", 31, &variable_buffer_data_size) >= 0) {
-            if (!variable_buffer_data_size)
+        } else if ((var_size = check_header_variable(s, "pixelAspectRatio",
+                                                     "float", 31)) >= 0) {
+            if (!var_size)
                 return AVERROR_INVALIDDATA;
 
-            avctx->sample_aspect_ratio = av_d2q(av_int2float(AV_RL32(buf)), 255);
+            sar = bytestream2_get_le32(&s->gb);
 
-            buf += variable_buffer_data_size;
             continue;
-        } else if (check_header_variable(avctx, &buf, buf_end, "compression", "compression", 29, &variable_buffer_data_size) >= 0) {
-            if (!variable_buffer_data_size)
+        } else if ((var_size = check_header_variable(s, "compression",
+                                                     "compression", 29)) >= 0) {
+            if (!var_size)
                 return AVERROR_INVALIDDATA;
 
-            if (s->compr == -1)
-                s->compr = *buf;
+            if (s->compression == EXR_UNKN)
+                s->compression = bytestream2_get_byte(&s->gb);
             else
-                av_log(avctx, AV_LOG_WARNING, "Found more than one compression attribute\n");
+                av_log(s->avctx, AV_LOG_WARNING,
+                       "Found more than one compression attribute.\n");
+
+            continue;
+        } else if ((var_size = check_header_variable(s, "tiles",
+                                                     "tiledesc", 22)) >= 0) {
+            char tileLevel;
+
+            if (!s->is_tile)
+                av_log(s->avctx, AV_LOG_WARNING,
+                       "Found tile attribute and scanline flags. Exr will be interpreted as scanline.\n");
+
+            s->tile_attr.xSize = bytestream2_get_le32(&s->gb);
+            s->tile_attr.ySize = bytestream2_get_le32(&s->gb);
+
+            tileLevel = bytestream2_get_byte(&s->gb);
+            s->tile_attr.level_mode = tileLevel & 0x0f;
+            s->tile_attr.level_round = (tileLevel >> 4) & 0x0f;
+
+            if (s->tile_attr.level_mode >= EXR_TILE_LEVEL_UNKNOWN){
+                avpriv_report_missing_feature(s->avctx, "Tile level mode %d",
+                                              s->tile_attr.level_mode);
+                return AVERROR_PATCHWELCOME;
+            }
+
+            if (s->tile_attr.level_round >= EXR_TILE_ROUND_UNKNOWN) {
+                avpriv_report_missing_feature(s->avctx, "Tile level round %d",
+                                              s->tile_attr.level_round);
+                return AVERROR_PATCHWELCOME;
+            }
+
+            continue;
+        } else if ((var_size = check_header_variable(s, "writer",
+                                                     "string", 1)) >= 0) {
+            uint8_t key[256] = { 0 };
+
+            bytestream2_get_buffer(&s->gb, key, FFMIN(sizeof(key) - 1, var_size));
+            av_dict_set(&metadata, "writer", key, 0);
 
-            buf += variable_buffer_data_size;
             continue;
         }
 
-        // Check if there is enough bytes for a header
-        if (buf_end - buf <= 9) {
-            av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
+        // Check if there are enough bytes for a header
+        if (bytestream2_get_bytes_left(&s->gb) <= 9) {
+            av_log(s->avctx, AV_LOG_ERROR, "Incomplete header\n");
             return AVERROR_INVALIDDATA;
         }
 
         // Process unknown variables
-        for (i = 0; i < 2; i++) {
-            // Skip variable name/type
-            while (++buf < buf_end)
-                if (buf[0] == 0x0)
-                    break;
-        }
-        buf++;
+        for (i = 0; i < 2; i++) // value_name and value_type
+            while (bytestream2_get_byte(&s->gb) != 0);
+
         // Skip variable length
-        if (buf_end - buf >= 5) {
-            variable_buffer_data_size = get_header_variable_length(&buf, buf_end);
-            if (!variable_buffer_data_size) {
-                av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
-                return AVERROR_INVALIDDATA;
-            }
-            buf += variable_buffer_data_size;
-        }
+        bytestream2_skip(&s->gb, bytestream2_get_le32(&s->gb));
     }
 
-    if (s->compr == -1) {
-        av_log(avctx, AV_LOG_ERROR, "Missing compression attribute\n");
+    ff_set_sar(s->avctx, av_d2q(av_int2float(sar), 255));
+
+    if (s->compression == EXR_UNKN) {
+        av_log(s->avctx, AV_LOG_ERROR, "Missing compression attribute.\n");
         return AVERROR_INVALIDDATA;
     }
 
-    if (buf >= buf_end) {
-        av_log(avctx, AV_LOG_ERROR, "Incomplete frame\n");
+    if (s->is_tile) {
+        if (s->tile_attr.xSize < 1 || s->tile_attr.ySize < 1) {
+            av_log(s->avctx, AV_LOG_ERROR, "Invalid tile attribute.\n");
+            return AVERROR_INVALIDDATA;
+        }
+    }
+
+    if (bytestream2_get_bytes_left(&s->gb) <= 0) {
+        av_log(s->avctx, AV_LOG_ERROR, "Incomplete frame.\n");
         return AVERROR_INVALIDDATA;
     }
-    buf++;
+
+    frame->metadata = metadata;
+
+    // aaand we are done
+    bytestream2_skip(&s->gb, 1);
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data,
+                        int *got_frame, AVPacket *avpkt)
+{
+    EXRContext *s = avctx->priv_data;
+    ThreadFrame frame = { .f = data };
+    AVFrame *picture = data;
+    uint8_t *ptr;
+
+    int y, ret;
+    int out_line_size;
+    int nb_blocks;   /* nb scanline or nb tile */
+    uint64_t start_offset_table;
+    uint64_t start_next_scanline;
+    PutByteContext offset_table_writer;
+
+    bytestream2_init(&s->gb, avpkt->data, avpkt->size);
+
+    if ((ret = decode_header(s, picture)) < 0)
+        return ret;
 
     switch (s->pixel_type) {
     case EXR_FLOAT:
     case EXR_HALF:
-        if (s->channel_offsets[3] >= 0)
-            avctx->pix_fmt = AV_PIX_FMT_RGBA64;
-        else
-            avctx->pix_fmt = AV_PIX_FMT_RGB48;
-        break;
     case EXR_UINT:
-        av_log_missing_feature(avctx, "32-bit unsigned int", 1);
-        return AVERROR_PATCHWELCOME;
+        if (s->channel_offsets[3] >= 0) {
+            if (!s->is_luma) {
+                avctx->pix_fmt = AV_PIX_FMT_RGBA64;
+            } else {
+                avctx->pix_fmt = AV_PIX_FMT_YA16;
+            }
+        } else {
+            if (!s->is_luma) {
+                avctx->pix_fmt = AV_PIX_FMT_RGB48;
+            } else {
+                avctx->pix_fmt = AV_PIX_FMT_GRAY16;
+            }
+        }
+        break;
     default:
-        av_log(avctx, AV_LOG_ERROR, "Missing channel list\n");
+        av_log(avctx, AV_LOG_ERROR, "Missing channel list.\n");
         return AVERROR_INVALIDDATA;
     }
 
-    switch (s->compr) {
+    if (s->apply_trc_type != AVCOL_TRC_UNSPECIFIED)
+        avctx->color_trc = s->apply_trc_type;
+
+    switch (s->compression) {
     case EXR_RAW:
     case EXR_RLE:
     case EXR_ZIP1:
@@ -713,56 +1704,72 @@ static int decode_frame(AVCodecContext *avctx,
     case EXR_ZIP16:
         s->scan_lines_per_block = 16;
         break;
+    case EXR_PIZ:
+    case EXR_B44:
+    case EXR_B44A:
+        s->scan_lines_per_block = 32;
+        break;
     default:
-        av_log(avctx, AV_LOG_ERROR, "Compression type %d is not supported\n", s->compr);
+        avpriv_report_missing_feature(avctx, "Compression %d", s->compression);
         return AVERROR_PATCHWELCOME;
     }
 
-    if (av_image_check_size(w, h, 0, avctx))
-        return AVERROR_INVALIDDATA;
-
-    // Verify the xmin, xmax, ymin, ymax and xdelta before setting the actual image size
-    if (s->xmin > s->xmax ||
-        s->ymin > s->ymax ||
+    /* Verify the xmin, xmax, ymin, ymax and xdelta before setting
+     * the actual image size. */
+    if (s->xmin > s->xmax                  ||
+        s->ymin > s->ymax                  ||
         s->xdelta != s->xmax - s->xmin + 1 ||
-        s->xmax >= w || s->ymax >= h) {
-        av_log(avctx, AV_LOG_ERROR, "Wrong sizing or missing size information\n");
+        s->xmax >= s->w                    ||
+        s->ymax >= s->h) {
+        av_log(avctx, AV_LOG_ERROR, "Wrong or missing size information.\n");
         return AVERROR_INVALIDDATA;
     }
 
-    if (w != avctx->width || h != avctx->height) {
-        avcodec_set_dimensions(avctx, w, h);
+    if ((ret = ff_set_dimensions(avctx, s->w, s->h)) < 0)
+        return ret;
+
+    s->desc          = av_pix_fmt_desc_get(avctx->pix_fmt);
+    if (!s->desc)
+        return AVERROR_INVALIDDATA;
+    out_line_size    = avctx->width * 2 * s->desc->nb_components;
+
+    if (s->is_tile) {
+        nb_blocks = ((s->xdelta + s->tile_attr.xSize - 1) / s->tile_attr.xSize) *
+        ((s->ydelta + s->tile_attr.ySize - 1) / s->tile_attr.ySize);
+    } else { /* scanline */
+        nb_blocks = (s->ydelta + s->scan_lines_per_block - 1) /
+        s->scan_lines_per_block;
     }
 
-    s->desc = av_pix_fmt_desc_get(avctx->pix_fmt);
-    out_line_size = avctx->width * 2 * s->desc->nb_components;
-    s->scan_line_size = s->xdelta * current_channel_offset;
-    scan_line_blocks = (s->ydelta + s->scan_lines_per_block - 1) / s->scan_lines_per_block;
+    if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
+        return ret;
 
-    if (s->compr != EXR_RAW) {
-        size_t thread_data_size, prev_size;
-        EXRThreadData *m;
+    if (bytestream2_get_bytes_left(&s->gb) < nb_blocks * 8)
+        return AVERROR_INVALIDDATA;
 
-        prev_size = s->thread_data_size;
-        if (av_size_mult(avctx->thread_count, sizeof(EXRThreadData), &thread_data_size))
-            return AVERROR(EINVAL);
+    // check offset table and recreate it if need
+    if (!s->is_tile && bytestream2_peek_le64(&s->gb) == 0) {
+        av_log(s->avctx, AV_LOG_DEBUG, "recreating invalid scanline offset table\n");
 
-        m = av_fast_realloc(s->thread_data, &s->thread_data_size, thread_data_size);
-        if (!m)
-            return AVERROR(ENOMEM);
-        s->thread_data = m;
-        memset(s->thread_data + prev_size, 0, s->thread_data_size - prev_size);
-    }
+        start_offset_table = bytestream2_tell(&s->gb);
+        start_next_scanline = start_offset_table + nb_blocks * 8;
+        bytestream2_init_writer(&offset_table_writer, &avpkt->data[start_offset_table], nb_blocks * 8);
 
-    if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
-        return ret;
+        for (y = 0; y < nb_blocks; y++) {
+            /* write offset of prev scanline in offset table */
+            bytestream2_put_le64(&offset_table_writer, start_next_scanline);
+
+            /* get len of next scanline */
+            bytestream2_seek(&s->gb, start_next_scanline + 4, SEEK_SET);/* skip line number */
+            start_next_scanline += (bytestream2_get_le32(&s->gb) + 8);
+        }
+        bytestream2_seek(&s->gb, start_offset_table, SEEK_SET);
     }
 
-    if (buf_end - buf < scan_line_blocks * 8)
-        return AVERROR_INVALIDDATA;
-    s->table = buf;
-    ptr = picture->data[0];
+    // save pointer we are going to use in decode_block
+    s->buf      = avpkt->data;
+    s->buf_size = avpkt->size;
+    ptr         = picture->data[0];
 
     // Zero out the start if ymin is not 0
     for (y = 0; y < s->ymin; y++) {
@@ -771,44 +1778,165 @@ static int decode_frame(AVCodecContext *avctx,
     }
 
     s->picture = picture;
-    avctx->execute2(avctx, decode_block, s->thread_data, NULL, scan_line_blocks);
+
+    avctx->execute2(avctx, decode_block, s->thread_data, NULL, nb_blocks);
 
     // Zero out the end if ymax+1 is not h
+    ptr = picture->data[0] + ((s->ymax+1) * picture->linesize[0]);
     for (y = s->ymax + 1; y < avctx->height; y++) {
         memset(ptr, 0, out_line_size);
         ptr += picture->linesize[0];
     }
 
+    picture->pict_type = AV_PICTURE_TYPE_I;
     *got_frame = 1;
 
-    return buf_size;
+    return avpkt->size;
 }
 
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    EXRContext *s = avctx->priv_data;
+    uint32_t i;
+    union av_intfloat32 t;
+    float one_gamma = 1.0f / s->gamma;
+    avpriv_trc_function trc_func = NULL;
+
+    s->avctx              = avctx;
+
+#if HAVE_BIGENDIAN
+    ff_bswapdsp_init(&s->bbdsp);
+#endif
+
+    trc_func = avpriv_get_trc_function_from_trc(s->apply_trc_type);
+    if (trc_func) {
+        for (i = 0; i < 65536; ++i) {
+            t = exr_half2float(i);
+            t.f = trc_func(t.f);
+            s->gamma_table[i] = exr_flt2uint(t.i);
+        }
+    } else {
+        if (one_gamma > 0.9999f && one_gamma < 1.0001f) {
+            for (i = 0; i < 65536; ++i)
+                s->gamma_table[i] = exr_halflt2uint(i);
+        } else {
+            for (i = 0; i < 65536; ++i) {
+                t = exr_half2float(i);
+                /* If negative value we reuse half value */
+                if (t.f <= 0.0f) {
+                    s->gamma_table[i] = exr_halflt2uint(i);
+                } else {
+                    t.f = powf(t.f, one_gamma);
+                    s->gamma_table[i] = exr_flt2uint(t.i);
+                }
+            }
+        }
+    }
+
+    // allocate thread data, used for non EXR_RAW compression types
+    s->thread_data = av_mallocz_array(avctx->thread_count, sizeof(EXRThreadData));
+    if (!s->thread_data)
+        return AVERROR_INVALIDDATA;
+
+    return 0;
+}
+
+#if HAVE_THREADS
+static int decode_init_thread_copy(AVCodecContext *avctx)
+{    EXRContext *s = avctx->priv_data;
+
+    // allocate thread data, used for non EXR_RAW compression types
+    s->thread_data = av_mallocz_array(avctx->thread_count, sizeof(EXRThreadData));
+    if (!s->thread_data)
+        return AVERROR_INVALIDDATA;
+
+    return 0;
+}
+#endif
+
 static av_cold int decode_end(AVCodecContext *avctx)
 {
     EXRContext *s = avctx->priv_data;
     int i;
-
-    for (i = 0; i < s->thread_data_size / sizeof(EXRThreadData); i++) {
+    for (i = 0; i < avctx->thread_count; i++) {
         EXRThreadData *td = &s->thread_data[i];
-        av_free(td->uncompressed_data);
-        av_free(td->tmp);
+        av_freep(&td->uncompressed_data);
+        av_freep(&td->tmp);
+        av_freep(&td->bitmap);
+        av_freep(&td->lut);
     }
 
     av_freep(&s->thread_data);
-    s->thread_data_size = 0;
     av_freep(&s->channels);
 
     return 0;
 }
 
+#define OFFSET(x) offsetof(EXRContext, x)
+#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+    { "layer", "Set the decoding layer", OFFSET(layer),
+        AV_OPT_TYPE_STRING, { .str = "" }, 0, 0, VD },
+    { "gamma", "Set the float gamma value when decoding", OFFSET(gamma),
+        AV_OPT_TYPE_FLOAT, { .dbl = 1.0f }, 0.001, FLT_MAX, VD },
+
+    // XXX: Note the abuse of the enum using AVCOL_TRC_UNSPECIFIED to subsume the existing gamma option
+    { "apply_trc", "color transfer characteristics to apply to EXR linear input", OFFSET(apply_trc_type),
+        AV_OPT_TYPE_INT, {.i64 = AVCOL_TRC_UNSPECIFIED }, 1, AVCOL_TRC_NB-1, VD, "apply_trc_type"},
+    { "bt709",        "BT.709",           0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_BT709 },        INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "gamma",        "gamma",            0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_UNSPECIFIED },  INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "gamma22",      "BT.470 M",         0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_GAMMA22 },      INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "gamma28",      "BT.470 BG",        0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_GAMMA28 },      INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "smpte170m",    "SMPTE 170 M",      0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_SMPTE170M },    INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "smpte240m",    "SMPTE 240 M",      0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_SMPTE240M },    INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "linear",       "Linear",           0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_LINEAR },       INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "log",          "Log",              0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_LOG },          INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "log_sqrt",     "Log square root",  0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_LOG_SQRT },     INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "iec61966_2_4", "IEC 61966-2-4",    0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_IEC61966_2_4 }, INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "bt1361",       "BT.1361",          0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_BT1361_ECG },   INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "iec61966_2_1", "IEC 61966-2-1",    0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_IEC61966_2_1 }, INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "bt2020_10bit", "BT.2020 - 10 bit", 0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_BT2020_10 },    INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "bt2020_12bit", "BT.2020 - 12 bit", 0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_BT2020_12 },    INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "smpte2084",    "SMPTE ST 2084",    0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_SMPTEST2084 },  INT_MIN, INT_MAX, VD, "apply_trc_type"},
+    { "smpte428_1",   "SMPTE ST 428-1",   0,
+        AV_OPT_TYPE_CONST, {.i64 = AVCOL_TRC_SMPTEST428_1 }, INT_MIN, INT_MAX, VD, "apply_trc_type"},
+
+    { NULL },
+};
+
+static const AVClass exr_class = {
+    .class_name = "EXR",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
 AVCodec ff_exr_decoder = {
-    .name               = "exr",
-    .type               = AVMEDIA_TYPE_VIDEO,
-    .id                 = AV_CODEC_ID_EXR,
-    .priv_data_size     = sizeof(EXRContext),
-    .close              = decode_end,
-    .decode             = decode_frame,
-    .capabilities       = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS | CODEC_CAP_SLICE_THREADS,
-    .long_name          = NULL_IF_CONFIG_SMALL("OpenEXR image"),
+    .name             = "exr",
+    .long_name        = NULL_IF_CONFIG_SMALL("OpenEXR image"),
+    .type             = AVMEDIA_TYPE_VIDEO,
+    .id               = AV_CODEC_ID_EXR,
+    .priv_data_size   = sizeof(EXRContext),
+    .init             = decode_init,
+    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
+    .close            = decode_end,
+    .decode           = decode_frame,
+    .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
+                        AV_CODEC_CAP_SLICE_THREADS,
+    .priv_class       = &exr_class,
 };