utvideoenc: Add missing AV_ prefix to codec ID
[ffmpeg.git] / libavcodec / pngdec.c
index 5711c8a..da63c5f 100644 (file)
@@ -2,26 +2,27 @@
  * PNG image format
  * Copyright (c) 2003 Fabrice Bellard
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
+#include "libavutil/imgutils.h"
 #include "avcodec.h"
 #include "bytestream.h"
 #include "png.h"
-#include "dsputil.h"
+#include "pngdsp.h"
 
 /* TODO:
  * - add 2, 4 and 16 bit depth support
 //#define DEBUG
 
 typedef struct PNGDecContext {
-    DSPContext dsp;
+    PNGDSPContext dsp;
 
-    const uint8_t *bytestream;
-    const uint8_t *bytestream_start;
-    const uint8_t *bytestream_end;
+    GetByteContext gb;
     AVFrame picture1, picture2;
     AVFrame *current_picture, *last_picture;
 
@@ -190,7 +189,7 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w
     }
 
 /* NOTE: 'dst' can be equal to 'last' */
-static void png_filter_row(DSPContext *dsp, uint8_t *dst, int filter_type,
+static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type,
                            uint8_t *src, uint8_t *last, int size, int bpp)
 {
     int i, p, r, g, b, a;
@@ -234,7 +233,7 @@ static void png_filter_row(DSPContext *dsp, uint8_t *dst, int filter_type,
         if(bpp > 1 && size > 4) {
             // would write off the end of the array if we let it process the last pixel with bpp=3
             int w = bpp==4 ? size : size-3;
-            dsp->add_png_paeth_prediction(dst+i, src+i, last+i, w-i, bpp);
+            dsp->add_paeth_prediction(dst+i, src+i, last+i, w-i, bpp);
             i = w;
         }
         ff_add_png_paeth_prediction(dst+i, src+i, last+i, size-i, bpp);
@@ -361,12 +360,9 @@ static void png_handle_row(PNGDecContext *s)
 static int png_decode_idat(PNGDecContext *s, int length)
 {
     int ret;
-    s->zstream.avail_in = length;
-    s->zstream.next_in = s->bytestream;
-    s->bytestream += length;
-
-    if(s->bytestream > s->bytestream_end)
-        return -1;
+    s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
+    s->zstream.next_in = s->gb.buffer;
+    bytestream2_skip(&s->gb, length);
 
     /* decode one line if possible */
     while (s->zstream.avail_in > 0) {
@@ -396,21 +392,19 @@ static int decode_frame(AVCodecContext *avctx,
     AVFrame *p;
     uint8_t *crow_buf_base = NULL;
     uint32_t tag, length;
-    int ret, crc;
+    int ret;
 
     FFSWAP(AVFrame *, s->current_picture, s->last_picture);
     avctx->coded_frame= s->current_picture;
     p = s->current_picture;
 
-    s->bytestream_start=
-    s->bytestream= buf;
-    s->bytestream_end= buf + buf_size;
-
     /* check signature */
-    if (memcmp(s->bytestream, ff_pngsig, 8) != 0 &&
-        memcmp(s->bytestream, ff_mngsig, 8) != 0)
+    if (buf_size < 8 ||
+        memcmp(buf, ff_pngsig, 8) != 0 &&
+        memcmp(buf, ff_mngsig, 8) != 0)
         return -1;
-    s->bytestream+= 8;
+
+    bytestream2_init(&s->gb, buf + 8, buf_size - 8);
     s->y=
     s->state=0;
 //    memset(s, 0, sizeof(PNGDecContext));
@@ -422,43 +416,37 @@ static int decode_frame(AVCodecContext *avctx,
     if (ret != Z_OK)
         return -1;
     for(;;) {
-        int tag32;
-        if (s->bytestream >= s->bytestream_end)
+        if (bytestream2_get_bytes_left(&s->gb) <= 0)
             goto fail;
-        length = bytestream_get_be32(&s->bytestream);
+        length = bytestream2_get_be32(&s->gb);
         if (length > 0x7fffffff)
             goto fail;
-        tag32 = bytestream_get_be32(&s->bytestream);
-        tag = bswap_32(tag32);
-#ifdef DEBUG
-        av_log(avctx, AV_LOG_DEBUG, "png: tag=%c%c%c%c length=%u\n",
-               (tag & 0xff),
-               ((tag >> 8) & 0xff),
-               ((tag >> 16) & 0xff),
-               ((tag >> 24) & 0xff), length);
-#endif
+        tag = bytestream2_get_le32(&s->gb);
+        av_dlog(avctx, "png: tag=%c%c%c%c length=%u\n",
+                (tag & 0xff),
+                ((tag >> 8) & 0xff),
+                ((tag >> 16) & 0xff),
+                ((tag >> 24) & 0xff), length);
         switch(tag) {
         case MKTAG('I', 'H', 'D', 'R'):
             if (length != 13)
                 goto fail;
-            s->width = bytestream_get_be32(&s->bytestream);
-            s->height = bytestream_get_be32(&s->bytestream);
-            if(avcodec_check_dimensions(avctx, s->width, s->height)){
+            s->width  = bytestream2_get_be32(&s->gb);
+            s->height = bytestream2_get_be32(&s->gb);
+            if(av_image_check_size(s->width, s->height, 0, avctx)){
                 s->width= s->height= 0;
                 goto fail;
             }
-            s->bit_depth = *s->bytestream++;
-            s->color_type = *s->bytestream++;
-            s->compression_type = *s->bytestream++;
-            s->filter_type = *s->bytestream++;
-            s->interlace_type = *s->bytestream++;
-            crc = bytestream_get_be32(&s->bytestream);
+            s->bit_depth        = bytestream2_get_byte(&s->gb);
+            s->color_type       = bytestream2_get_byte(&s->gb);
+            s->compression_type = bytestream2_get_byte(&s->gb);
+            s->filter_type      = bytestream2_get_byte(&s->gb);
+            s->interlace_type   = bytestream2_get_byte(&s->gb);
+            bytestream2_skip(&s->gb, 4); /* crc */
             s->state |= PNG_IHDR;
-#ifdef DEBUG
-            av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d compression_type=%d filter_type=%d interlace_type=%d\n",
-                   s->width, s->height, s->bit_depth, s->color_type,
-                   s->compression_type, s->filter_type, s->interlace_type);
-#endif
+            av_dlog(avctx, "width=%d height=%d depth=%d color_type=%d compression_type=%d filter_type=%d interlace_type=%d\n",
+                    s->width, s->height, s->bit_depth, s->color_type,
+                    s->compression_type, s->filter_type, s->interlace_type);
             break;
         case MKTAG('I', 'D', 'A', 'T'):
             if (!(s->state & PNG_IHDR))
@@ -491,8 +479,12 @@ static int decode_frame(AVCodecContext *avctx,
                 } else if (s->bit_depth == 1 &&
                            s->color_type == PNG_COLOR_TYPE_GRAY) {
                     avctx->pix_fmt = PIX_FMT_MONOBLACK;
-                } else if (s->color_type == PNG_COLOR_TYPE_PALETTE) {
+                } else if (s->bit_depth == 8 &&
+                           s->color_type == PNG_COLOR_TYPE_PALETTE) {
                     avctx->pix_fmt = PIX_FMT_PAL8;
+                } else if (s->bit_depth == 8 &&
+                           s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
+                    avctx->pix_fmt = PIX_FMT_Y400A;
                 } else {
                     goto fail;
                 }
@@ -504,7 +496,7 @@ static int decode_frame(AVCodecContext *avctx,
                     av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
                     goto fail;
                 }
-                p->pict_type= FF_I_TYPE;
+                p->pict_type= AV_PICTURE_TYPE_I;
                 p->key_frame= 1;
                 p->interlaced_frame = !!s->interlace_type;
 
@@ -518,10 +510,8 @@ static int decode_frame(AVCodecContext *avctx,
                                                          s->width);
                     s->crow_size = s->pass_row_size + 1;
                 }
-#ifdef DEBUG
-                av_log(avctx, AV_LOG_DEBUG, "row_size=%d crow_size =%d\n",
-                       s->row_size, s->crow_size);
-#endif
+                av_dlog(avctx, "row_size=%d crow_size =%d\n",
+                        s->row_size, s->crow_size);
                 s->image_buf = p->data[0];
                 s->image_linesize = p->linesize[0];
                 /* copy the palette if needed */
@@ -550,8 +540,7 @@ static int decode_frame(AVCodecContext *avctx,
             s->state |= PNG_IDAT;
             if (png_decode_idat(s, length) < 0)
                 goto fail;
-            /* skip crc */
-            crc = bytestream_get_be32(&s->bytestream);
+            bytestream2_skip(&s->gb, 4); /* crc */
             break;
         case MKTAG('P', 'L', 'T', 'E'):
             {
@@ -562,16 +551,16 @@ static int decode_frame(AVCodecContext *avctx,
                 /* read the palette */
                 n = length / 3;
                 for(i=0;i<n;i++) {
-                    r = *s->bytestream++;
-                    g = *s->bytestream++;
-                    b = *s->bytestream++;
+                    r = bytestream2_get_byte(&s->gb);
+                    g = bytestream2_get_byte(&s->gb);
+                    b = bytestream2_get_byte(&s->gb);
                     s->palette[i] = (0xff << 24) | (r << 16) | (g << 8) | b;
                 }
                 for(;i<256;i++) {
                     s->palette[i] = (0xff << 24);
                 }
                 s->state |= PNG_PLTE;
-                crc = bytestream_get_be32(&s->bytestream);
+                bytestream2_skip(&s->gb, 4); /* crc */
             }
             break;
         case MKTAG('t', 'R', 'N', 'S'):
@@ -584,28 +573,28 @@ static int decode_frame(AVCodecContext *avctx,
                     !(s->state & PNG_PLTE))
                     goto skip_tag;
                 for(i=0;i<length;i++) {
-                    v = *s->bytestream++;
+                    v = bytestream2_get_byte(&s->gb);
                     s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24);
                 }
-                crc = bytestream_get_be32(&s->bytestream);
+                bytestream2_skip(&s->gb, 4); /* crc */
             }
             break;
         case MKTAG('I', 'E', 'N', 'D'):
             if (!(s->state & PNG_ALLIMAGE))
                 goto fail;
-            crc = bytestream_get_be32(&s->bytestream);
+            bytestream2_skip(&s->gb, 4); /* crc */
             goto exit_loop;
         default:
             /* skip tag */
         skip_tag:
-            s->bytestream += length + 4;
+            bytestream2_skip(&s->gb, length + 4);
             break;
         }
     }
  exit_loop:
      /* handle p-frames only if a predecessor frame is available */
      if(s->last_picture->data[0] != NULL) {
-         if(!(avpkt->flags & PKT_FLAG_KEY)) {
+         if(!(avpkt->flags & AV_PKT_FLAG_KEY)) {
             int i, j;
             uint8_t *pd = s->current_picture->data[0];
             uint8_t *pd_last = s->last_picture->data[0];
@@ -623,7 +612,7 @@ static int decode_frame(AVCodecContext *avctx,
     *picture= *s->current_picture;
     *data_size = sizeof(AVFrame);
 
-    ret = s->bytestream - s->bytestream_start;
+    ret = bytestream2_tell(&s->gb);
  the_end:
     inflateEnd(&s->zstream);
     av_free(crow_buf_base);
@@ -643,21 +632,31 @@ static av_cold int png_dec_init(AVCodecContext *avctx){
     s->last_picture = &s->picture2;
     avcodec_get_frame_defaults(&s->picture1);
     avcodec_get_frame_defaults(&s->picture2);
-    dsputil_init(&s->dsp, avctx);
+    ff_pngdsp_init(&s->dsp);
+
+    return 0;
+}
+
+static av_cold int png_dec_end(AVCodecContext *avctx)
+{
+    PNGDecContext *s = avctx->priv_data;
+
+    if (s->picture1.data[0])
+        avctx->release_buffer(avctx, &s->picture1);
+    if (s->picture2.data[0])
+        avctx->release_buffer(avctx, &s->picture2);
 
     return 0;
 }
 
-AVCodec png_decoder = {
-    "png",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_PNG,
-    sizeof(PNGDecContext),
-    png_dec_init,
-    NULL,
-    NULL, //decode_end,
-    decode_frame,
-    CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
-    NULL,
-    .long_name = NULL_IF_CONFIG_SMALL("PNG image"),
+AVCodec ff_png_decoder = {
+    .name           = "png",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_PNG,
+    .priv_data_size = sizeof(PNGDecContext),
+    .init           = png_dec_init,
+    .close          = png_dec_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
+    .long_name      = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"),
 };