Merge remote-tracking branch 'qatar/master'
[ffmpeg.git] / libavcodec / mjpeg.c
index 8e6d90b..a5b1a80 100644 (file)
 /*
  * MJPEG encoder and decoder
- * Copyright (c) 2000, 2001 Fabrice Bellard.
+ * Copyright (c) 2000, 2001 Fabrice Bellard
  * Copyright (c) 2003 Alex Beregszaszi
  * Copyright (c) 2003-2004 Michael Niedermayer
  *
- * This library is free software; you can redistribute it and/or
+ * Support for external huffman table, various fixes (AVID workaround),
+ * aspecting, new decode_frame mechanism and apple mjpeg-b support
+ *                                  by Alex Beregszaszi
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
- * Support for external huffman table, various fixes (AVID workaround),
- * aspecting, new decode_frame mechanism and apple mjpeg-b support
- *                                  by Alex Beregszaszi <alex@naxine.org>
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
- * @file mjpeg.c
+ * @file
  * MJPEG encoder and decoder.
  */
-//#define DEBUG
-#include <assert.h>
-
-#include "avcodec.h"
-#include "dsputil.h"
-#include "mpegvideo.h"
-
-/* use two quantizer tables (one for luminance and one for chrominance) */
-/* not yet working */
-#undef TWOMATRIXES
-
-typedef struct MJpegContext {
-    uint8_t huff_size_dc_luminance[12]; //FIXME use array [3] instead of lumi / chrom, for easier addressing 
-    uint16_t huff_code_dc_luminance[12];
-    uint8_t huff_size_dc_chrominance[12];
-    uint16_t huff_code_dc_chrominance[12];
-
-    uint8_t huff_size_ac_luminance[256];
-    uint16_t huff_code_ac_luminance[256];
-    uint8_t huff_size_ac_chrominance[256];
-    uint16_t huff_code_ac_chrominance[256];
-} MJpegContext;
-
-/* JPEG marker codes */
-typedef enum {
-    /* start of frame */
-    SOF0  = 0xc0,      /* baseline */
-    SOF1  = 0xc1,      /* extended sequential, huffman */
-    SOF2  = 0xc2,      /* progressive, huffman */
-    SOF3  = 0xc3,      /* lossless, huffman */
-
-    SOF5  = 0xc5,      /* differential sequential, huffman */
-    SOF6  = 0xc6,      /* differential progressive, huffman */
-    SOF7  = 0xc7,      /* differential lossless, huffman */
-    JPG   = 0xc8,      /* reserved for JPEG extension */
-    SOF9  = 0xc9,      /* extended sequential, arithmetic */
-    SOF10 = 0xca,      /* progressive, arithmetic */
-    SOF11 = 0xcb,      /* lossless, arithmetic */
 
-    SOF13 = 0xcd,      /* differential sequential, arithmetic */
-    SOF14 = 0xce,      /* differential progressive, arithmetic */
-    SOF15 = 0xcf,      /* differential lossless, arithmetic */
+#include "mjpeg.h"
 
-    DHT   = 0xc4,      /* define huffman tables */
-
-    DAC   = 0xcc,      /* define arithmetic-coding conditioning */
-
-    /* restart with modulo 8 count "m" */
-    RST0  = 0xd0,
-    RST1  = 0xd1,
-    RST2  = 0xd2,
-    RST3  = 0xd3,
-    RST4  = 0xd4,
-    RST5  = 0xd5,
-    RST6  = 0xd6,
-    RST7  = 0xd7,
-
-    SOI   = 0xd8,      /* start of image */
-    EOI   = 0xd9,      /* end of image */
-    SOS   = 0xda,      /* start of scan */
-    DQT   = 0xdb,      /* define quantization tables */
-    DNL   = 0xdc,      /* define number of lines */
-    DRI   = 0xdd,      /* define restart interval */
-    DHP   = 0xde,      /* define hierarchical progression */
-    EXP   = 0xdf,      /* expand reference components */
-
-    APP0  = 0xe0,
-    APP1  = 0xe1,
-    APP2  = 0xe2,
-    APP3  = 0xe3,
-    APP4  = 0xe4,
-    APP5  = 0xe5,
-    APP6  = 0xe6,
-    APP7  = 0xe7,
-    APP8  = 0xe8,
-    APP9  = 0xe9,
-    APP10 = 0xea,
-    APP11 = 0xeb,
-    APP12 = 0xec,
-    APP13 = 0xed,
-    APP14 = 0xee,
-    APP15 = 0xef,
-
-    JPG0  = 0xf0,
-    JPG1  = 0xf1,
-    JPG2  = 0xf2,
-    JPG3  = 0xf3,
-    JPG4  = 0xf4,
-    JPG5  = 0xf5,
-    JPG6  = 0xf6,
-    JPG7  = 0xf7,
-    JPG8  = 0xf8,
-    JPG9  = 0xf9,
-    JPG10 = 0xfa,
-    JPG11 = 0xfb,
-    JPG12 = 0xfc,
-    JPG13 = 0xfd,
-
-    COM   = 0xfe,      /* comment */
-
-    TEM   = 0x01,      /* temporary private use for arithmetic coding */
-
-    /* 0x02 -> 0xbf reserved */
-} JPEG_MARKER;
 
 #if 0
 /* These are the sample quantization tables given in JPEG spec section K.1.
  * The spec says that the values given produce "good" quality, and
  * when divided by 2, "very good" quality.
  */
-static const unsigned char std_luminance_quant_tbl[64] = {
+const unsigned char std_luminance_quant_tbl[64] = {
     16,  11,  10,  16,  24,  40,  51,  61,
     12,  12,  14,  19,  26,  58,  60,  55,
     14,  13,  16,  24,  40,  57,  69,  56,
@@ -148,7 +48,7 @@ static const unsigned char std_luminance_quant_tbl[64] = {
     49,  64,  78,  87, 103, 121, 120, 101,
     72,  92,  95,  98, 112, 100, 103,  99
 };
-static const unsigned char std_chrominance_quant_tbl[64] = {
+const unsigned char std_chrominance_quant_tbl[64] = {
     17,  18,  24,  47,  99,  99,  99,  99,
     18,  21,  26,  66,  99,  99,  99,  99,
     24,  26,  56,  99,  99,  99,  99,  99,
@@ -162,19 +62,17 @@ static const unsigned char std_chrominance_quant_tbl[64] = {
 
 /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
 /* IMPORTANT: these are only valid for 8-bit data precision! */
-static const uint8_t bits_dc_luminance[17] =
+const uint8_t avpriv_mjpeg_bits_dc_luminance[17] =
 { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
-static const uint8_t val_dc_luminance[] =
+const uint8_t avpriv_mjpeg_val_dc[12] =
 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
 
-static const uint8_t bits_dc_chrominance[17] =
+const uint8_t avpriv_mjpeg_bits_dc_chrominance[17] =
 { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
-static const uint8_t val_dc_chrominance[] =
-{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
 
-static const uint8_t bits_ac_luminance[17] =
+const uint8_t avpriv_mjpeg_bits_ac_luminance[17] =
 { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
-static const uint8_t val_ac_luminance[] =
+const uint8_t avpriv_mjpeg_val_ac_luminance[] =
 { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
   0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
   0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
@@ -195,13 +93,13 @@ static const uint8_t val_ac_luminance[] =
   0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
   0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
   0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
-  0xf9, 0xfa 
+  0xf9, 0xfa
 };
 
-static const uint8_t bits_ac_chrominance[17] =
+const uint8_t avpriv_mjpeg_bits_ac_chrominance[17] =
 { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
 
-static const uint8_t val_ac_chrominance[] =
+const uint8_t avpriv_mjpeg_val_ac_chrominance[] =
 { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
   0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
   0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
@@ -222,12 +120,13 @@ static const uint8_t val_ac_chrominance[] =
   0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
   0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
   0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
-  0xf9, 0xfa 
+  0xf9, 0xfa
 };
 
 /* isn't this function nicer than the one in the libjpeg ? */
-static void build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
-                                const uint8_t *bits_table, const uint8_t *val_table)
+void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
+                                  const uint8_t *bits_table,
+                                  const uint8_t *val_table)
 {
     int i, j, k,nb, code, sym;
 
@@ -244,1983 +143,3 @@ static void build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
         code <<= 1;
     }
 }
-
-#ifdef CONFIG_ENCODERS
-int mjpeg_init(MpegEncContext *s)
-{
-    MJpegContext *m;
-    
-    m = av_malloc(sizeof(MJpegContext));
-    if (!m)
-        return -1;
-    
-    s->min_qcoeff=-1023;
-    s->max_qcoeff= 1023;
-
-    /* build all the huffman tables */
-    build_huffman_codes(m->huff_size_dc_luminance,
-                        m->huff_code_dc_luminance,
-                        bits_dc_luminance,
-                        val_dc_luminance);
-    build_huffman_codes(m->huff_size_dc_chrominance,
-                        m->huff_code_dc_chrominance,
-                        bits_dc_chrominance,
-                        val_dc_chrominance);
-    build_huffman_codes(m->huff_size_ac_luminance,
-                        m->huff_code_ac_luminance,
-                        bits_ac_luminance,
-                        val_ac_luminance);
-    build_huffman_codes(m->huff_size_ac_chrominance,
-                        m->huff_code_ac_chrominance,
-                        bits_ac_chrominance,
-                        val_ac_chrominance);
-    
-    s->mjpeg_ctx = m;
-    return 0;
-}
-
-void mjpeg_close(MpegEncContext *s)
-{
-    av_free(s->mjpeg_ctx);
-}
-#endif //CONFIG_ENCODERS
-
-#define PREDICT(ret, topleft, top, left, predictor)\
-    switch(predictor){\
-        case 1: ret= left; break;\
-        case 2: ret= top; break;\
-        case 3: ret= topleft; break;\
-        case 4: ret= left   +   top - topleft; break;\
-        case 5: ret= left   + ((top - topleft)>>1); break;\
-        case 6: ret= top + ((left   - topleft)>>1); break;\
-        default:\
-        case 7: ret= (left + top)>>1; break;\
-    }
-
-#ifdef CONFIG_ENCODERS
-static inline void put_marker(PutBitContext *p, int code)
-{
-    put_bits(p, 8, 0xff);
-    put_bits(p, 8, code);
-}
-
-/* table_class: 0 = DC coef, 1 = AC coefs */
-static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
-                             const uint8_t *bits_table, const uint8_t *value_table)
-{
-    PutBitContext *p = &s->pb;
-    int n, i;
-
-    put_bits(p, 4, table_class);
-    put_bits(p, 4, table_id);
-
-    n = 0;
-    for(i=1;i<=16;i++) {
-        n += bits_table[i];
-        put_bits(p, 8, bits_table[i]);
-    }
-
-    for(i=0;i<n;i++)
-        put_bits(p, 8, value_table[i]);
-
-    return n + 17;
-}
-
-static void jpeg_table_header(MpegEncContext *s)
-{
-    PutBitContext *p = &s->pb;
-    int i, j, size;
-    uint8_t *ptr;
-
-    /* quant matrixes */
-    put_marker(p, DQT);
-#ifdef TWOMATRIXES
-    put_bits(p, 16, 2 + 2 * (1 + 64));
-#else
-    put_bits(p, 16, 2 + 1 * (1 + 64));
-#endif
-    put_bits(p, 4, 0); /* 8 bit precision */
-    put_bits(p, 4, 0); /* table 0 */
-    for(i=0;i<64;i++) {
-        j = s->intra_scantable.permutated[i];
-        put_bits(p, 8, s->intra_matrix[j]);
-    }
-#ifdef TWOMATRIXES
-    put_bits(p, 4, 0); /* 8 bit precision */
-    put_bits(p, 4, 1); /* table 1 */
-    for(i=0;i<64;i++) {
-        j = s->intra_scantable.permutated[i];
-        put_bits(p, 8, s->chroma_intra_matrix[j]);
-    }
-#endif
-
-    /* huffman table */
-    put_marker(p, DHT);
-    flush_put_bits(p);
-    ptr = pbBufPtr(p);
-    put_bits(p, 16, 0); /* patched later */
-    size = 2;
-    size += put_huffman_table(s, 0, 0, bits_dc_luminance, val_dc_luminance);
-    size += put_huffman_table(s, 0, 1, bits_dc_chrominance, val_dc_chrominance);
-    
-    size += put_huffman_table(s, 1, 0, bits_ac_luminance, val_ac_luminance);
-    size += put_huffman_table(s, 1, 1, bits_ac_chrominance, val_ac_chrominance);
-    ptr[0] = size >> 8;
-    ptr[1] = size;
-}
-
-static void jpeg_put_comments(MpegEncContext *s)
-{
-    PutBitContext *p = &s->pb;
-    int size;
-    uint8_t *ptr;
-
-    if (s->aspect_ratio_info /* && !lossless */)
-    {
-    /* JFIF header */
-    put_marker(p, APP0);
-    put_bits(p, 16, 16);
-    put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
-    put_bits(p, 16, 0x0201); /* v 1.02 */
-    put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
-    put_bits(p, 16, s->avctx->sample_aspect_ratio.num);
-    put_bits(p, 16, s->avctx->sample_aspect_ratio.den);
-    put_bits(p, 8, 0); /* thumbnail width */
-    put_bits(p, 8, 0); /* thumbnail height */
-    }
-
-    /* comment */
-    if(!(s->flags & CODEC_FLAG_BITEXACT)){
-        put_marker(p, COM);
-        flush_put_bits(p);
-        ptr = pbBufPtr(p);
-        put_bits(p, 16, 0); /* patched later */
-        put_string(p, LIBAVCODEC_IDENT, 1);
-        size = strlen(LIBAVCODEC_IDENT)+3;
-        ptr[0] = size >> 8;
-        ptr[1] = size;
-    }
-}
-
-void mjpeg_picture_header(MpegEncContext *s)
-{
-    const int lossless= s->avctx->codec_id == CODEC_ID_LJPEG;
-
-    put_marker(&s->pb, SOI);
-
-    if (!s->mjpeg_data_only_frames)
-    {
-    jpeg_put_comments(s);    
-
-    if (s->mjpeg_write_tables) jpeg_table_header(s);
-
-    put_marker(&s->pb, lossless ? SOF3 : SOF0);
-
-    put_bits(&s->pb, 16, 17);
-    if(lossless && s->avctx->pix_fmt == PIX_FMT_RGBA32)
-        put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
-    else
-        put_bits(&s->pb, 8, 8); /* 8 bits/component */
-    put_bits(&s->pb, 16, s->height);
-    put_bits(&s->pb, 16, s->width);
-    put_bits(&s->pb, 8, 3); /* 3 components */
-    
-    /* Y component */
-    put_bits(&s->pb, 8, 1); /* component number */
-    put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
-    put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
-    put_bits(&s->pb, 8, 0); /* select matrix */
-    
-    /* Cb component */
-    put_bits(&s->pb, 8, 2); /* component number */
-    put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
-    put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
-#ifdef TWOMATRIXES
-    put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
-#else
-    put_bits(&s->pb, 8, 0); /* select matrix */
-#endif
-
-    /* Cr component */
-    put_bits(&s->pb, 8, 3); /* component number */
-    put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
-    put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
-#ifdef TWOMATRIXES
-    put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
-#else
-    put_bits(&s->pb, 8, 0); /* select matrix */
-#endif
-    }
-
-    /* scan header */
-    put_marker(&s->pb, SOS);
-    put_bits(&s->pb, 16, 12); /* length */
-    put_bits(&s->pb, 8, 3); /* 3 components */
-    
-    /* Y component */
-    put_bits(&s->pb, 8, 1); /* index */
-    put_bits(&s->pb, 4, 0); /* DC huffman table index */
-    put_bits(&s->pb, 4, 0); /* AC huffman table index */
-    
-    /* Cb component */
-    put_bits(&s->pb, 8, 2); /* index */
-    put_bits(&s->pb, 4, 1); /* DC huffman table index */
-    put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
-    
-    /* Cr component */
-    put_bits(&s->pb, 8, 3); /* index */
-    put_bits(&s->pb, 4, 1); /* DC huffman table index */
-    put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
-
-    put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
-    put_bits(&s->pb, 8, lossless ? 0 : 63); /* Se (not used) */
-    put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
-}
-
-static void escape_FF(MpegEncContext *s, int start)
-{
-    int size= put_bits_count(&s->pb) - start*8;
-    int i, ff_count;
-    uint8_t *buf= s->pb.buf + start;
-    int align= (-(size_t)(buf))&3;
-    
-    assert((size&7) == 0);
-    size >>= 3;
-    
-    ff_count=0;
-    for(i=0; i<size && i<align; i++){
-        if(buf[i]==0xFF) ff_count++;
-    }
-    for(; i<size-15; i+=16){
-        int acc, v;
-
-        v= *(uint32_t*)(&buf[i]);
-        acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
-        v= *(uint32_t*)(&buf[i+4]);
-        acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
-        v= *(uint32_t*)(&buf[i+8]);
-        acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
-        v= *(uint32_t*)(&buf[i+12]);
-        acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
-
-        acc>>=4;
-        acc+= (acc>>16);
-        acc+= (acc>>8);
-        ff_count+= acc&0xFF;
-    }
-    for(; i<size; i++){
-        if(buf[i]==0xFF) ff_count++;
-    }
-
-    if(ff_count==0) return;
-    
-    /* skip put bits */
-    for(i=0; i<ff_count-3; i+=4)
-        put_bits(&s->pb, 32, 0);
-    put_bits(&s->pb, (ff_count-i)*8, 0);
-    flush_put_bits(&s->pb); 
-
-    for(i=size-1; ff_count; i--){
-        int v= buf[i];
-
-        if(v==0xFF){
-//printf("%d %d\n", i, ff_count);
-            buf[i+ff_count]= 0;
-            ff_count--;
-        }
-
-        buf[i+ff_count]= v;
-    }
-}
-
-void ff_mjpeg_stuffing(PutBitContext * pbc)
-{
-    int length;
-    length= (-put_bits_count(pbc))&7;
-    if(length) put_bits(pbc, length, (1<<length)-1);
-}
-
-void mjpeg_picture_trailer(MpegEncContext *s)
-{
-    ff_mjpeg_stuffing(&s->pb);
-    flush_put_bits(&s->pb);
-
-    assert((s->header_bits&7)==0);
-    
-    escape_FF(s, s->header_bits>>3);
-
-    put_marker(&s->pb, EOI);
-}
-
-static inline void mjpeg_encode_dc(MpegEncContext *s, int val,
-                                  uint8_t *huff_size, uint16_t *huff_code)
-{
-    int mant, nbits;
-
-    if (val == 0) {
-        put_bits(&s->pb, huff_size[0], huff_code[0]);
-    } else {
-        mant = val;
-        if (val < 0) {
-            val = -val;
-            mant--;
-        }
-        
-        nbits= av_log2_16bit(val) + 1;
-            
-        put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
-        
-        put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
-    }
-}
-
-static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
-{
-    int mant, nbits, code, i, j;
-    int component, dc, run, last_index, val;
-    MJpegContext *m = s->mjpeg_ctx;
-    uint8_t *huff_size_ac;
-    uint16_t *huff_code_ac;
-    
-    /* DC coef */
-    component = (n <= 3 ? 0 : n - 4 + 1);
-    dc = block[0]; /* overflow is impossible */
-    val = dc - s->last_dc[component];
-    if (n < 4) {
-        mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
-        huff_size_ac = m->huff_size_ac_luminance;
-        huff_code_ac = m->huff_code_ac_luminance;
-    } else {
-        mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
-        huff_size_ac = m->huff_size_ac_chrominance;
-        huff_code_ac = m->huff_code_ac_chrominance;
-    }
-    s->last_dc[component] = dc;
-    
-    /* AC coefs */
-    
-    run = 0;
-    last_index = s->block_last_index[n];
-    for(i=1;i<=last_index;i++) {
-        j = s->intra_scantable.permutated[i];
-        val = block[j];
-        if (val == 0) {
-            run++;
-        } else {
-            while (run >= 16) {
-                put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
-                run -= 16;
-            }
-            mant = val;
-            if (val < 0) {
-                val = -val;
-                mant--;
-            }
-            
-            nbits= av_log2(val) + 1;
-            code = (run << 4) | nbits;
-
-            put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
-        
-            put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
-            run = 0;
-        }
-    }
-
-    /* output EOB only if not already 64 values */
-    if (last_index < 63 || run != 0)
-        put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
-}
-
-void mjpeg_encode_mb(MpegEncContext *s, 
-                     DCTELEM block[6][64])
-{
-    int i;
-    for(i=0;i<6;i++) {
-        encode_block(s, block[i], i);
-    }
-}
-
-static int encode_picture_lossless(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
-    MpegEncContext * const s = avctx->priv_data;
-    MJpegContext * const m = s->mjpeg_ctx;
-    AVFrame *pict = data;
-    const int width= s->width;
-    const int height= s->height;
-    AVFrame * const p= (AVFrame*)&s->current_picture;
-    const int predictor= avctx->prediction_method+1;
-
-    init_put_bits(&s->pb, buf, buf_size);
-
-    *p = *pict;
-    p->pict_type= FF_I_TYPE;
-    p->key_frame= 1;
-    
-    mjpeg_picture_header(s);
-
-    s->header_bits= put_bits_count(&s->pb);
-
-    if(avctx->pix_fmt == PIX_FMT_RGBA32){
-        int x, y, i;
-        const int linesize= p->linesize[0];
-        uint16_t buffer[2048][4];
-        int left[3], top[3], topleft[3];
-
-        for(i=0; i<3; i++){
-            buffer[0][i]= 1 << (9 - 1);
-        }
-
-        for(y = 0; y < height; y++) {
-            const int modified_predictor= y ? predictor : 1;
-            uint8_t *ptr = p->data[0] + (linesize * y);
-
-            for(i=0; i<3; i++){
-                top[i]= left[i]= topleft[i]= buffer[0][i];
-            }
-            for(x = 0; x < width; x++) {
-                buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
-                buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
-                buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
-
-                for(i=0;i<3;i++) {
-                    int pred, diff;
-
-                    PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
-                        
-                    topleft[i]= top[i];
-                    top[i]= buffer[x+1][i];
-                    
-                    left[i]= buffer[x][i];
-
-                    diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
-                    
-                    if(i==0)
-                        mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
-                    else
-                        mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
-                }
-            }
-        }
-    }else{
-        int mb_x, mb_y, i;
-        const int mb_width  = (width  + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
-        const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
-        
-        for(mb_y = 0; mb_y < mb_height; mb_y++) {
-            for(mb_x = 0; mb_x < mb_width; mb_x++) {
-                if(mb_x==0 || mb_y==0){
-                    for(i=0;i<3;i++) {
-                        uint8_t *ptr;
-                        int x, y, h, v, linesize;
-                        h = s->mjpeg_hsample[i];
-                        v = s->mjpeg_vsample[i];
-                        linesize= p->linesize[i];
-
-                        for(y=0; y<v; y++){
-                            for(x=0; x<h; x++){
-                                int pred;
-
-                                ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
-                                if(y==0 && mb_y==0){
-                                    if(x==0 && mb_x==0){
-                                        pred= 128;
-                                    }else{
-                                        pred= ptr[-1];
-                                    }
-                                }else{
-                                    if(x==0 && mb_x==0){
-                                        pred= ptr[-linesize];
-                                    }else{
-                                        PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
-                                    }
-                                }
-                                
-                                if(i==0)
-                                    mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
-                                else
-                                    mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
-                            }
-                        }
-                    }
-                }else{
-                    for(i=0;i<3;i++) {
-                        uint8_t *ptr;
-                        int x, y, h, v, linesize;
-                        h = s->mjpeg_hsample[i];
-                        v = s->mjpeg_vsample[i];
-                        linesize= p->linesize[i];
-                             
-                        for(y=0; y<v; y++){
-                            for(x=0; x<h; x++){
-                                int pred;
-
-                                ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
-//printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr); 
-                                PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
-
-                                if(i==0)
-                                    mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
-                                else
-                                    mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
-                            }
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    emms_c();
-    
-    mjpeg_picture_trailer(s);
-    s->picture_number++;
-
-    flush_put_bits(&s->pb);
-    return pbBufPtr(&s->pb) - s->pb.buf;
-//    return (put_bits_count(&f->pb)+7)/8;
-}
-
-#endif //CONFIG_ENCODERS
-
-/******************************************/
-/* decoding */
-
-#define MAX_COMPONENTS 4
-
-typedef struct MJpegDecodeContext {
-    AVCodecContext *avctx;
-    GetBitContext gb;
-    int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
-
-    int start_code; /* current start code */
-    int buffer_size;
-    uint8_t *buffer;
-
-    int16_t quant_matrixes[4][64];
-    VLC vlcs[2][4];
-    int qscale[4];      ///< quantizer scale calculated from quant_matrixes
-
-    int org_height;  /* size given at codec init */
-    int first_picture;    /* true if decoding first picture */
-    int interlaced;     /* true if interlaced */
-    int bottom_field;   /* true if bottom field */
-    int lossless;
-    int rgb;
-    int rct;            /* standard rct */  
-    int pegasus_rct;    /* pegasus reversible colorspace transform */  
-    int bits;           /* bits per component */
-
-    int width, height;
-    int mb_width, mb_height;
-    int nb_components;
-    int component_id[MAX_COMPONENTS];
-    int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
-    int v_count[MAX_COMPONENTS];
-    int comp_index[MAX_COMPONENTS];
-    int dc_index[MAX_COMPONENTS];
-    int ac_index[MAX_COMPONENTS];
-    int nb_blocks[MAX_COMPONENTS];
-    int h_scount[MAX_COMPONENTS];
-    int v_scount[MAX_COMPONENTS];
-    int h_max, v_max; /* maximum h and v counts */
-    int quant_index[4];   /* quant table index for each component */
-    int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
-    AVFrame picture; /* picture structure */
-    int linesize[MAX_COMPONENTS];                   ///< linesize << interlaced
-    uint8_t *qscale_table;
-    DCTELEM block[64] __align8;
-    ScanTable scantable;
-    void (*idct_put)(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/);
-
-    int restart_interval;
-    int restart_count;
-
-    int buggy_avid;
-    int interlace_polarity;
-} MJpegDecodeContext;
-
-static int mjpeg_decode_dht(MJpegDecodeContext *s);
-
-static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table, 
-                      int nb_codes)
-{
-    uint8_t huff_size[256];
-    uint16_t huff_code[256];
-
-    memset(huff_size, 0, sizeof(huff_size));
-    build_huffman_codes(huff_size, huff_code, bits_table, val_table);
-    
-    return init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2);
-}
-
-static int mjpeg_decode_init(AVCodecContext *avctx)
-{
-    MJpegDecodeContext *s = avctx->priv_data;
-    MpegEncContext s2;
-
-    s->avctx = avctx;
-
-    /* ugly way to get the idct & scantable FIXME */
-    memset(&s2, 0, sizeof(MpegEncContext));
-    s2.avctx= avctx;
-//    s2->out_format = FMT_MJPEG;
-    dsputil_init(&s2.dsp, avctx);
-    DCT_common_init(&s2);
-
-    s->scantable= s2.intra_scantable;
-    s->idct_put= s2.dsp.idct_put;
-
-    s->mpeg_enc_ctx_allocated = 0;
-    s->buffer_size = 102400; /* smaller buffer should be enough,
-                               but photojpg files could ahive bigger sizes */
-    s->buffer = av_malloc(s->buffer_size);
-    if (!s->buffer)
-       return -1;
-    s->start_code = -1;
-    s->first_picture = 1;
-    s->org_height = avctx->coded_height;
-    
-    build_vlc(&s->vlcs[0][0], bits_dc_luminance, val_dc_luminance, 12);
-    build_vlc(&s->vlcs[0][1], bits_dc_chrominance, val_dc_chrominance, 12);
-    build_vlc(&s->vlcs[1][0], bits_ac_luminance, val_ac_luminance, 251);
-    build_vlc(&s->vlcs[1][1], bits_ac_chrominance, val_ac_chrominance, 251);
-
-    if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
-    {
-       av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
-       init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
-       mjpeg_decode_dht(s);
-       /* should check for error - but dunno */
-    }
-
-    return 0;
-}
-
-/* quantize tables */
-static int mjpeg_decode_dqt(MJpegDecodeContext *s)
-{
-    int len, index, i, j;
-    
-    len = get_bits(&s->gb, 16) - 2;
-
-    while (len >= 65) {
-        /* only 8 bit precision handled */
-        if (get_bits(&s->gb, 4) != 0)
-       {
-           dprintf("dqt: 16bit precision\n");
-            return -1;
-       }
-        index = get_bits(&s->gb, 4);
-        if (index >= 4)
-            return -1;
-        dprintf("index=%d\n", index);
-        /* read quant table */
-        for(i=0;i<64;i++) {
-            j = s->scantable.permutated[i];
-           s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
-        }
-
-        //XXX FIXME finetune, and perhaps add dc too
-        s->qscale[index]= FFMAX(
-            s->quant_matrixes[index][s->scantable.permutated[1]],
-            s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
-       dprintf("qscale[%d]: %d\n", index, s->qscale[index]);
-        len -= 65;
-    }
-    
-    return 0;
-}
-
-/* decode huffman tables and build VLC decoders */
-static int mjpeg_decode_dht(MJpegDecodeContext *s)
-{
-    int len, index, i, class, n, v, code_max;
-    uint8_t bits_table[17];
-    uint8_t val_table[256];
-    
-    len = get_bits(&s->gb, 16) - 2;
-
-    while (len > 0) {
-        if (len < 17)
-            return -1;
-        class = get_bits(&s->gb, 4);
-        if (class >= 2)
-            return -1;
-        index = get_bits(&s->gb, 4);
-        if (index >= 4)
-            return -1;
-        n = 0;
-        for(i=1;i<=16;i++) {
-            bits_table[i] = get_bits(&s->gb, 8);
-            n += bits_table[i];
-        }
-        len -= 17;
-        if (len < n || n > 256)
-            return -1;
-
-        code_max = 0;
-        for(i=0;i<n;i++) {
-            v = get_bits(&s->gb, 8);
-            if (v > code_max)
-                code_max = v;
-            val_table[i] = v;
-        }
-        len -= n;
-
-        /* build VLC and flush previous vlc if present */
-        free_vlc(&s->vlcs[class][index]);
-        dprintf("class=%d index=%d nb_codes=%d\n",
-               class, index, code_max + 1);
-        if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1) < 0){
-            return -1;
-        }
-    }
-    return 0;
-}
-
-static int mjpeg_decode_sof(MJpegDecodeContext *s)
-{
-    int len, nb_components, i, width, height;
-
-    /* XXX: verify len field validity */
-    len = get_bits(&s->gb, 16);
-    s->bits= get_bits(&s->gb, 8);
-    
-    if(s->pegasus_rct) s->bits=9;  
-    if(s->bits==9 && !s->pegasus_rct) s->rct=1;    //FIXME ugly
-
-    if (s->bits != 8 && !s->lossless){
-        av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
-        return -1;
-    }
-    height = get_bits(&s->gb, 16);
-    width = get_bits(&s->gb, 16);
-    dprintf("sof0: picture: %dx%d\n", width, height);
-
-    nb_components = get_bits(&s->gb, 8);
-    if (nb_components <= 0 ||
-        nb_components > MAX_COMPONENTS)
-        return -1;
-    s->nb_components = nb_components;
-    s->h_max = 1;
-    s->v_max = 1;
-    for(i=0;i<nb_components;i++) {
-        /* component id */
-        s->component_id[i] = get_bits(&s->gb, 8) - 1;
-        s->h_count[i] = get_bits(&s->gb, 4);
-        s->v_count[i] = get_bits(&s->gb, 4);
-        /* compute hmax and vmax (only used in interleaved case) */
-        if (s->h_count[i] > s->h_max)
-            s->h_max = s->h_count[i];
-        if (s->v_count[i] > s->v_max)
-            s->v_max = s->v_count[i];
-        s->quant_index[i] = get_bits(&s->gb, 8);
-        if (s->quant_index[i] >= 4)
-            return -1;
-        dprintf("component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
-           s->v_count[i], s->component_id[i], s->quant_index[i]);
-    }
-    
-    if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
-
-    /* if different size, realloc/alloc picture */
-    /* XXX: also check h_count and v_count */
-    if (width != s->width || height != s->height) {
-        av_freep(&s->qscale_table);
-            
-        s->width = width;
-        s->height = height;
-        avcodec_set_dimensions(s->avctx, width, height);
-
-        /* test interlaced mode */
-        if (s->first_picture &&
-            s->org_height != 0 &&
-            s->height < ((s->org_height * 3) / 4)) {
-            s->interlaced = 1;
-//         s->bottom_field = (s->interlace_polarity) ? 1 : 0;
-            s->bottom_field = 0;
-            s->avctx->height *= 2;
-        }
-
-        s->qscale_table= av_mallocz((s->width+15)/16);
-
-        s->first_picture = 0;
-    }
-    
-    if(s->interlaced && s->bottom_field)
-        return 0;
-    /* XXX: not complete test ! */
-    switch((s->h_count[0] << 4) | s->v_count[0]) {
-    case 0x11:
-        if(s->rgb){
-            s->avctx->pix_fmt = PIX_FMT_RGBA32;
-        }else if(s->nb_components==3)
-            s->avctx->pix_fmt = PIX_FMT_YUV444P;
-        else
-            s->avctx->pix_fmt = PIX_FMT_GRAY8;
-        break;
-    case 0x21:
-        s->avctx->pix_fmt = PIX_FMT_YUV422P;
-        break;
-    default:
-    case 0x22:
-        s->avctx->pix_fmt = PIX_FMT_YUV420P;
-        break;
-    }
-
-    if(s->picture.data[0])
-        s->avctx->release_buffer(s->avctx, &s->picture);
-
-    s->picture.reference= 0;
-    if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
-        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
-        return -1;
-    }
-    s->picture.pict_type= I_TYPE;
-    s->picture.key_frame= 1;
-    
-    for(i=0; i<3; i++){
-        s->linesize[i]= s->picture.linesize[i] << s->interlaced;
-    }
-
-//    printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
-    
-    if (len != (8+(3*nb_components)))
-    {
-       dprintf("decode_sof0: error, len(%d) mismatch\n", len);
-    }
-    
-    return 0;
-}
-
-static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
-{
-    int code;
-    code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
-    if (code < 0)
-    {
-       dprintf("mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
-                &s->vlcs[0][dc_index]);
-        return 0xffff;
-    }
-
-    if(code)
-        return get_xbits(&s->gb, code);
-    else
-        return 0;
-}
-
-/* decode block and dequantize */
-static int decode_block(MJpegDecodeContext *s, DCTELEM *block, 
-                        int component, int dc_index, int ac_index, int quant_index)
-{
-    int code, i, j, level, val;
-    VLC *ac_vlc;
-    int16_t *quant_matrix;
-
-    /* DC coef */
-    val = mjpeg_decode_dc(s, dc_index);
-    if (val == 0xffff) {
-        dprintf("error dc\n");
-        return -1;
-    }
-    quant_matrix = s->quant_matrixes[quant_index];
-    val = val * quant_matrix[0] + s->last_dc[component];
-    s->last_dc[component] = val;
-    block[0] = val;
-    /* AC coefs */
-    ac_vlc = &s->vlcs[1][ac_index];
-    i = 1;
-    for(;;) {
-       code = get_vlc2(&s->gb, s->vlcs[1][ac_index].table, 9, 2);
-
-        if (code < 0) {
-            dprintf("error ac\n");
-            return -1;
-        }
-        /* EOB */
-        if (code == 0)
-            break;
-        if (code == 0xf0) {
-            i += 16;
-        } else {
-            level = get_xbits(&s->gb, code & 0xf);
-            i += code >> 4;
-            if (i >= 64) {
-                dprintf("error count: %d\n", i);
-                return -1;
-            }
-            j = s->scantable.permutated[i];
-            block[j] = level * quant_matrix[j];
-            i++;
-            if (i >= 64)
-                break;
-        }
-    }
-    return 0;
-}
-
-static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
-    int i, mb_x, mb_y;
-    uint16_t buffer[2048][4];
-    int left[3], top[3], topleft[3];
-    const int linesize= s->linesize[0];
-    const int mask= (1<<s->bits)-1;
-    
-    for(i=0; i<3; i++){
-        buffer[0][i]= 1 << (s->bits + point_transform - 1);
-    }
-    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
-        const int modified_predictor= mb_y ? predictor : 1;
-        uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
-
-        if (s->interlaced && s->bottom_field)
-            ptr += linesize >> 1;
-
-        for(i=0; i<3; i++){
-            top[i]= left[i]= topleft[i]= buffer[0][i];
-        }
-        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
-            if (s->restart_interval && !s->restart_count)
-                s->restart_count = s->restart_interval;
-
-            for(i=0;i<3;i++) {
-                int pred;
-
-                topleft[i]= top[i];
-                top[i]= buffer[mb_x][i];
-
-                PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
-                
-                left[i]= 
-                buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
-            }
-
-            if (s->restart_interval && !--s->restart_count) {
-                align_get_bits(&s->gb);
-                skip_bits(&s->gb, 16); /* skip RSTn */
-            }
-        }
-
-        if(s->rct){
-            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
-                ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
-                ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
-                ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
-            }
-        }else if(s->pegasus_rct){
-            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
-                ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
-                ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
-                ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
-            }
-        }else{
-            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
-                ptr[4*mb_x+0] = buffer[mb_x][0];
-                ptr[4*mb_x+1] = buffer[mb_x][1];
-                ptr[4*mb_x+2] = buffer[mb_x][2];
-            }
-        }
-    }
-    return 0;
-}
-
-static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
-    int i, mb_x, mb_y;
-    const int nb_components=3;
-
-    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
-        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
-            if (s->restart_interval && !s->restart_count)
-                s->restart_count = s->restart_interval;
-
-            if(mb_x==0 || mb_y==0 || s->interlaced){
-                for(i=0;i<nb_components;i++) {
-                    uint8_t *ptr;
-                    int n, h, v, x, y, c, j, linesize;
-                    n = s->nb_blocks[i];
-                    c = s->comp_index[i];
-                    h = s->h_scount[i];
-                    v = s->v_scount[i];
-                    x = 0;
-                    y = 0;
-                    linesize= s->linesize[c];
-                    
-                    for(j=0; j<n; j++) {
-                        int pred;
-
-                        ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
-                        if(y==0 && mb_y==0){
-                            if(x==0 && mb_x==0){
-                                pred= 128 << point_transform;
-                            }else{
-                                pred= ptr[-1];
-                            }
-                        }else{
-                            if(x==0 && mb_x==0){
-                                pred= ptr[-linesize];
-                            }else{
-                                PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
-                            }
-                        }
-                        
-                        if (s->interlaced && s->bottom_field)
-                            ptr += linesize >> 1;
-                        *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
-
-                        if (++x == h) {
-                            x = 0;
-                            y++;
-                        }
-                    }
-                }
-            }else{
-                for(i=0;i<nb_components;i++) {
-                    uint8_t *ptr;
-                    int n, h, v, x, y, c, j, linesize;
-                    n = s->nb_blocks[i];
-                    c = s->comp_index[i];
-                    h = s->h_scount[i];
-                    v = s->v_scount[i];
-                    x = 0;
-                    y = 0;
-                    linesize= s->linesize[c];
-                    
-                    for(j=0; j<n; j++) {
-                        int pred;
-
-                        ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
-                        PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
-                        *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
-                        if (++x == h) {
-                            x = 0;
-                            y++;
-                        }
-                    }
-                }
-            }
-            if (s->restart_interval && !--s->restart_count) {
-                align_get_bits(&s->gb);
-                skip_bits(&s->gb, 16); /* skip RSTn */
-            }
-        }
-    }
-    return 0;
-}
-
-static int mjpeg_decode_scan(MJpegDecodeContext *s){
-    int i, mb_x, mb_y;
-    const int nb_components=3;
-
-    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
-        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
-            if (s->restart_interval && !s->restart_count)
-                s->restart_count = s->restart_interval;
-
-            for(i=0;i<nb_components;i++) {
-                uint8_t *ptr;
-                int n, h, v, x, y, c, j;
-                n = s->nb_blocks[i];
-                c = s->comp_index[i];
-                h = s->h_scount[i];
-                v = s->v_scount[i];
-                x = 0;
-                y = 0;
-                for(j=0;j<n;j++) {
-                    memset(s->block, 0, sizeof(s->block));
-                    if (decode_block(s, s->block, i, 
-                                     s->dc_index[i], s->ac_index[i], 
-                                     s->quant_index[c]) < 0) {
-                        dprintf("error y=%d x=%d\n", mb_y, mb_x);
-                        return -1;
-                    }
-//                 dprintf("mb: %d %d processed\n", mb_y, mb_x);
-                    ptr = s->picture.data[c] + 
-                        (((s->linesize[c] * (v * mb_y + y) * 8) + 
-                        (h * mb_x + x) * 8) >> s->avctx->lowres);
-                    if (s->interlaced && s->bottom_field)
-                        ptr += s->linesize[c] >> 1;
-//av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n", mb_x, mb_y, x, y, c, s->bottom_field, (v * mb_y + y) * 8, (h * mb_x + x) * 8);
-                    s->idct_put(ptr, s->linesize[c], s->block);
-                    if (++x == h) {
-                        x = 0;
-                        y++;
-                    }
-                }
-            }
-            /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */
-            if (s->restart_interval && (s->restart_interval < 1350) &&
-                !--s->restart_count) {
-                align_get_bits(&s->gb);
-                skip_bits(&s->gb, 16); /* skip RSTn */
-                for (i=0; i<nb_components; i++) /* reset dc */
-                    s->last_dc[i] = 1024;
-            }
-        }
-    }
-    return 0;
-}
-
-static int mjpeg_decode_sos(MJpegDecodeContext *s)
-{
-    int len, nb_components, i, h, v, predictor, point_transform;
-    int vmax, hmax, index, id;
-    const int block_size= s->lossless ? 1 : 8;
-
-    /* XXX: verify len field validity */
-    len = get_bits(&s->gb, 16);
-    nb_components = get_bits(&s->gb, 8);
-    if (len != 6+2*nb_components)
-    {
-       dprintf("decode_sos: invalid len (%d)\n", len);
-       return -1;
-    }
-    /* XXX: only interleaved scan accepted */
-    if (nb_components != s->nb_components)
-    {
-       dprintf("decode_sos: components(%d) mismatch\n", nb_components);
-        return -1;
-    }
-    vmax = 0;
-    hmax = 0;
-    for(i=0;i<nb_components;i++) {
-        id = get_bits(&s->gb, 8) - 1;
-       dprintf("component: %d\n", id);
-        /* find component index */
-        for(index=0;index<s->nb_components;index++)
-            if (id == s->component_id[index])
-                break;
-        if (index == s->nb_components)
-       {
-           dprintf("decode_sos: index(%d) out of components\n", index);
-            return -1;
-       }
-
-        s->comp_index[i] = index;
-
-        s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
-        s->h_scount[i] = s->h_count[index];
-        s->v_scount[i] = s->v_count[index];
-
-        s->dc_index[i] = get_bits(&s->gb, 4);
-        s->ac_index[i] = get_bits(&s->gb, 4);
-
-       if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
-           s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
-           goto out_of_range;
-#if 0 //buggy
-       switch(s->start_code)
-       {
-           case SOF0:
-               if (dc_index[i] > 1 || ac_index[i] > 1)
-                   goto out_of_range;
-               break;
-           case SOF1:
-           case SOF2:
-               if (dc_index[i] > 3 || ac_index[i] > 3)
-                   goto out_of_range;
-               break;
-           case SOF3:
-               if (dc_index[i] > 3 || ac_index[i] != 0)
-                   goto out_of_range;
-               break;  
-       }
-#endif
-    }
-
-    predictor= get_bits(&s->gb, 8); /* lossless predictor or start of spectral (Ss) */
-    skip_bits(&s->gb, 8); /* Se */
-    skip_bits(&s->gb, 4); /* Ah */
-    point_transform= get_bits(&s->gb, 4); /* Al */
-
-    for(i=0;i<nb_components;i++) 
-        s->last_dc[i] = 1024;
-
-    if (nb_components > 1) {
-        /* interleaved stream */
-        s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
-        s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
-    } else {
-        h = s->h_max / s->h_scount[s->comp_index[0]];
-        v = s->v_max / s->v_scount[s->comp_index[0]];
-        s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);
-        s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
-        s->nb_blocks[0] = 1;
-        s->h_scount[0] = 1;
-        s->v_scount[0] = 1;
-    }
-
-    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
-        av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "", predictor, point_transform);
-    
-    if(s->lossless){
-            if(s->rgb){
-                if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
-                    return -1;
-            }else{
-                if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
-                    return -1;
-            }
-    }else{
-        if(mjpeg_decode_scan(s) < 0)
-            return -1;
-    }
-    emms_c();
-    return 0;
- out_of_range:
-    dprintf("decode_sos: ac/dc index out of range\n");
-    return -1;
-}
-
-static int mjpeg_decode_dri(MJpegDecodeContext *s)
-{
-    if (get_bits(&s->gb, 16) != 4)
-       return -1;
-    s->restart_interval = get_bits(&s->gb, 16);
-    dprintf("restart interval: %d\n", s->restart_interval);
-
-    return 0;
-}
-
-static int mjpeg_decode_app(MJpegDecodeContext *s)
-{
-    int len, id;
-
-    /* XXX: verify len field validity */
-    len = get_bits(&s->gb, 16);
-    if (len < 5)
-       return -1;
-
-    id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
-    id = be2me_32(id);
-    len -= 6;
-
-    if(s->avctx->debug & FF_DEBUG_STARTCODE){
-        av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id); 
-    }
-    
-    /* buggy AVID, it puts EOI only at every 10th frame */
-    /* also this fourcc is used by non-avid files too, it holds some
-       informations, but it's always present in AVID creates files */
-    if (id == ff_get_fourcc("AVI1"))
-    {
-       /* structure:
-           4bytes      AVI1
-           1bytes      polarity
-           1bytes      always zero
-           4bytes      field_size
-           4bytes      field_size_less_padding
-       */
-       s->buggy_avid = 1;
-//     if (s->first_picture)
-//         printf("mjpeg: workarounding buggy AVID\n");
-       s->interlace_polarity = get_bits(&s->gb, 8);
-#if 0
-       skip_bits(&s->gb, 8);
-       skip_bits(&s->gb, 32);
-       skip_bits(&s->gb, 32);
-       len -= 10;
-#endif
-//     if (s->interlace_polarity)
-//         printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
-       goto out;
-    }
-    
-//    len -= 2;
-    
-    if (id == ff_get_fourcc("JFIF"))
-    {
-       int t_w, t_h, v1, v2;
-       skip_bits(&s->gb, 8); /* the trailing zero-byte */
-       v1= get_bits(&s->gb, 8);
-        v2= get_bits(&s->gb, 8);
-        skip_bits(&s->gb, 8);
-
-        s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
-        s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
-
-        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
-            av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
-                v1, v2,
-                s->avctx->sample_aspect_ratio.num,
-                s->avctx->sample_aspect_ratio.den
-            );
-
-       t_w = get_bits(&s->gb, 8);
-       t_h = get_bits(&s->gb, 8);
-       if (t_w && t_h)
-       {
-           /* skip thumbnail */
-           if (len-10-(t_w*t_h*3) > 0)
-               len -= t_w*t_h*3;
-       }
-       len -= 10;
-       goto out;
-    }
-    
-    if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))
-    {
-        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
-            av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
-       skip_bits(&s->gb, 16); /* version */
-       skip_bits(&s->gb, 16); /* flags0 */
-       skip_bits(&s->gb, 16); /* flags1 */
-       skip_bits(&s->gb, 8); /* transform */
-       len -= 7;
-       goto out;
-    }
-
-    if (id == ff_get_fourcc("LJIF")){
-        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
-            av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
-       skip_bits(&s->gb, 16); /* version ? */
-       skip_bits(&s->gb, 16); /* unknwon always 0? */
-       skip_bits(&s->gb, 16); /* unknwon always 0? */
-       skip_bits(&s->gb, 16); /* unknwon always 0? */
-        switch( get_bits(&s->gb, 8)){
-        case 1:
-            s->rgb= 1;
-            s->pegasus_rct=0;
-            break;
-        case 2:
-            s->rgb= 1;
-            s->pegasus_rct=1;
-            break;
-        default:
-            av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
-        }
-        len -= 9;
-        goto out;
-    }
-    
-    /* Apple MJPEG-A */
-    if ((s->start_code == APP1) && (len > (0x28 - 8)))
-    {
-       id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
-       id = be2me_32(id);
-       len -= 4;
-       if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */
-       {
-#if 0
-           skip_bits(&s->gb, 32); /* field size */
-           skip_bits(&s->gb, 32); /* pad field size */
-           skip_bits(&s->gb, 32); /* next off */
-           skip_bits(&s->gb, 32); /* quant off */
-           skip_bits(&s->gb, 32); /* huff off */
-           skip_bits(&s->gb, 32); /* image off */
-           skip_bits(&s->gb, 32); /* scan off */
-           skip_bits(&s->gb, 32); /* data off */
-#endif
-            if (s->avctx->debug & FF_DEBUG_PICT_INFO)
-               av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
-       }
-    }
-
-out:
-    /* slow but needed for extreme adobe jpegs */
-    if (len < 0)
-       av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
-    while(--len > 0)
-       skip_bits(&s->gb, 8);
-
-    return 0;
-}
-
-static int mjpeg_decode_com(MJpegDecodeContext *s)
-{
-    /* XXX: verify len field validity */
-    int len = get_bits(&s->gb, 16);
-    if (len >= 2 && len < 32768) {
-       /* XXX: any better upper bound */
-       uint8_t *cbuf = av_malloc(len - 1);
-       if (cbuf) {
-           int i;
-           for (i = 0; i < len - 2; i++)
-               cbuf[i] = get_bits(&s->gb, 8);
-           if (i > 0 && cbuf[i-1] == '\n')
-               cbuf[i-1] = 0;
-           else
-               cbuf[i] = 0;
-
-            if(s->avctx->debug & FF_DEBUG_PICT_INFO)
-                av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
-
-           /* buggy avid, it puts EOI only at every 10th frame */
-           if (!strcmp(cbuf, "AVID"))
-           {
-               s->buggy_avid = 1;
-               //      if (s->first_picture)
-               //          printf("mjpeg: workarounding buggy AVID\n");
-           }
-
-           av_free(cbuf);
-       }
-    }
-
-    return 0;
-}
-
-#if 0
-static int valid_marker_list[] =
-{
-        /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
-/* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-/* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-/* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-/* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-/* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
-}
-#endif
-
-/* return the 8 bit start code value and update the search
-   state. Return -1 if no start code found */
-static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)
-{
-    uint8_t *buf_ptr;
-    unsigned int v, v2;
-    int val;
-#ifdef DEBUG
-    int skipped=0;
-#endif
-
-    buf_ptr = *pbuf_ptr;
-    while (buf_ptr < buf_end) {
-        v = *buf_ptr++;
-       v2 = *buf_ptr;
-        if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
-           val = *buf_ptr++;
-           goto found;
-        }
-#ifdef DEBUG
-       skipped++;
-#endif
-    }
-    val = -1;
-found:
-#ifdef DEBUG
-    dprintf("find_marker skipped %d bytes\n", skipped);
-#endif
-    *pbuf_ptr = buf_ptr;
-    return val;
-}
-
-static int mjpeg_decode_frame(AVCodecContext *avctx, 
-                              void *data, int *data_size,
-                              uint8_t *buf, int buf_size)
-{
-    MJpegDecodeContext *s = avctx->priv_data;
-    uint8_t *buf_end, *buf_ptr;
-    int start_code;
-    AVFrame *picture = data;
-
-    /* no supplementary picture */
-    if (buf_size == 0)
-        return 0;
-
-    buf_ptr = buf;
-    buf_end = buf + buf_size;
-    while (buf_ptr < buf_end) {
-        /* find start next marker */
-        start_code = find_marker(&buf_ptr, buf_end);
-       {
-           /* EOF */
-            if (start_code < 0) {
-               goto the_end;
-            } else {
-                dprintf("marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);
-               
-               if ((buf_end - buf_ptr) > s->buffer_size)
-               {
-                   av_free(s->buffer);
-                   s->buffer_size = buf_end-buf_ptr;
-                   s->buffer = av_malloc(s->buffer_size);
-                   dprintf("buffer too small, expanding to %d bytes\n",
-                       s->buffer_size);
-               }
-               
-               /* unescape buffer of SOS */
-               if (start_code == SOS)
-               {
-                   uint8_t *src = buf_ptr;
-                   uint8_t *dst = s->buffer;
-
-                   while (src<buf_end)
-                   {
-                       uint8_t x = *(src++);
-
-                       *(dst++) = x;
-                       if (x == 0xff)
-                       {
-                           while(*src == 0xff) src++;
-
-                           x = *(src++);
-                           if (x >= 0xd0 && x <= 0xd7)
-                               *(dst++) = x;
-                           else if (x)
-                               break;
-                       }
-                   }
-                   init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
-                   
-                   dprintf("escaping removed %d bytes\n",
-                       (buf_end - buf_ptr) - (dst - s->buffer));
-               }
-               else
-                   init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
-               
-               s->start_code = start_code;
-                if(s->avctx->debug & FF_DEBUG_STARTCODE){
-                    av_log(s->avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
-                }
-
-               /* process markers */
-               if (start_code >= 0xd0 && start_code <= 0xd7) {
-                   dprintf("restart marker: %d\n", start_code&0x0f);
-                   /* APP fields */
-               } else if (start_code >= APP0 && start_code <= APP15) {
-                   mjpeg_decode_app(s);
-                   /* Comment */
-               } else if (start_code == COM){
-                   mjpeg_decode_com(s);
-               }
-
-                switch(start_code) {
-                case SOI:
-                   s->restart_interval = 0;
-                    /* nothing to do on SOI */
-                    break;
-                case DQT:
-                    mjpeg_decode_dqt(s);
-                    break;
-                case DHT:
-                    if(mjpeg_decode_dht(s) < 0){
-                        av_log(s->avctx, AV_LOG_ERROR, "huffman table decode error\n");
-                        return -1;
-                    }
-                    break;
-                case SOF0:
-                    s->lossless=0;
-                    if (mjpeg_decode_sof(s) < 0) 
-                       return -1;
-                    break;
-                case SOF3:
-                    s->lossless=1;
-                    if (mjpeg_decode_sof(s) < 0) 
-                       return -1;
-                    break;
-               case EOI:
-                   if ((s->buggy_avid && !s->interlaced) || s->restart_interval) 
-                        break;
-eoi_parser:
-                   {
-                        if (s->interlaced) {
-                            s->bottom_field ^= 1;
-                            /* if not bottom field, do not output image yet */
-                            if (s->bottom_field)
-                                goto not_the_end;
-                        }
-                        *picture = s->picture;
-                        *data_size = sizeof(AVFrame);
-
-                        if(!s->lossless){
-                            picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]); 
-                            picture->qstride= 0;
-                            picture->qscale_table= s->qscale_table;
-                            memset(picture->qscale_table, picture->quality, (s->width+15)/16);
-                            if(avctx->debug & FF_DEBUG_QP)
-                                av_log(s->avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
-                            picture->quality*= FF_QP2LAMBDA;
-                        }
-                        
-                        goto the_end;
-                    }
-                   break;
-                case SOS:
-                    mjpeg_decode_sos(s);
-                   /* buggy avid puts EOI every 10-20th frame */
-                   /* if restart period is over process EOI */
-                   if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
-                       goto eoi_parser;
-                    break;
-               case DRI:
-                   mjpeg_decode_dri(s);
-                   break;
-               case SOF1:
-               case SOF2:
-               case SOF5:
-               case SOF6:
-               case SOF7:
-               case SOF9:
-               case SOF10:
-               case SOF11:
-               case SOF13:
-               case SOF14:
-               case SOF15:
-               case JPG:
-                   av_log(s->avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
-                   break;
-//             default:
-//                 printf("mjpeg: unsupported marker (%x)\n", start_code);
-//                 break;
-                }
-
-not_the_end:
-               /* eof process start code */
-               buf_ptr += (get_bits_count(&s->gb)+7)/8;
-               dprintf("marker parser used %d bytes (%d bits)\n",
-                   (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
-            }
-        }
-    }
-the_end:
-    dprintf("mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);
-//    return buf_end - buf_ptr;
-    return buf_ptr - buf;
-}
-
-static int mjpegb_decode_frame(AVCodecContext *avctx, 
-                              void *data, int *data_size,
-                              uint8_t *buf, int buf_size)
-{
-    MJpegDecodeContext *s = avctx->priv_data;
-    uint8_t *buf_end, *buf_ptr;
-    AVFrame *picture = data;
-    GetBitContext hgb; /* for the header */
-    uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;
-    uint32_t field_size;
-
-    /* no supplementary picture */
-    if (buf_size == 0)
-        return 0;
-
-    buf_ptr = buf;
-    buf_end = buf + buf_size;
-    
-read_header:
-    /* reset on every SOI */
-    s->restart_interval = 0;
-
-    init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);
-
-    skip_bits(&hgb, 32); /* reserved zeros */
-    
-    if (get_bits_long(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))
-    {
-       dprintf("not mjpeg-b (bad fourcc)\n");
-       return 0;
-    }
-
-    field_size = get_bits_long(&hgb, 32); /* field size */
-    dprintf("field size: 0x%x\n", field_size);
-    skip_bits(&hgb, 32); /* padded field size */
-    second_field_offs = get_bits_long(&hgb, 32);
-    dprintf("second field offs: 0x%x\n", second_field_offs);
-    if (second_field_offs)
-       s->interlaced = 1;
-
-    dqt_offs = get_bits_long(&hgb, 32);
-    dprintf("dqt offs: 0x%x\n", dqt_offs);
-    if (dqt_offs)
-    {
-       init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);
-       s->start_code = DQT;
-       mjpeg_decode_dqt(s);
-    }
-    
-    dht_offs = get_bits_long(&hgb, 32);
-    dprintf("dht offs: 0x%x\n", dht_offs);
-    if (dht_offs)
-    {
-       init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);
-       s->start_code = DHT;
-       mjpeg_decode_dht(s);
-    }
-
-    sof_offs = get_bits_long(&hgb, 32);
-    dprintf("sof offs: 0x%x\n", sof_offs);
-    if (sof_offs)
-    {
-       init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);
-       s->start_code = SOF0;
-       if (mjpeg_decode_sof(s) < 0)
-           return -1;
-    }
-
-    sos_offs = get_bits_long(&hgb, 32);
-    dprintf("sos offs: 0x%x\n", sos_offs);
-    if (sos_offs)
-    {
-//     init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);
-       init_get_bits(&s->gb, buf+sos_offs, field_size*8);
-       s->start_code = SOS;
-       mjpeg_decode_sos(s);
-    }
-
-    skip_bits(&hgb, 32); /* start of data offset */
-
-    if (s->interlaced) {
-        s->bottom_field ^= 1;
-        /* if not bottom field, do not output image yet */
-        if (s->bottom_field && second_field_offs)
-       {
-           buf_ptr = buf + second_field_offs;
-           second_field_offs = 0;
-           goto read_header;
-       }
-    }
-
-    //XXX FIXME factorize, this looks very similar to the EOI code
-
-    *picture= s->picture;
-    *data_size = sizeof(AVFrame);
-    
-    if(!s->lossless){
-        picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]); 
-        picture->qstride= 0;
-        picture->qscale_table= s->qscale_table;
-        memset(picture->qscale_table, picture->quality, (s->width+15)/16);
-        if(avctx->debug & FF_DEBUG_QP)
-            av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
-        picture->quality*= FF_QP2LAMBDA;
-    }
-
-    return buf_ptr - buf;
-}
-
-#include "sp5x.h"
-
-static int sp5x_decode_frame(AVCodecContext *avctx, 
-                              void *data, int *data_size,
-                              uint8_t *buf, int buf_size)
-{
-#if 0
-    MJpegDecodeContext *s = avctx->priv_data;
-#endif
-    const int qscale = 5;
-    uint8_t *buf_ptr, *buf_end, *recoded;
-    int i = 0, j = 0;
-
-    /* no supplementary picture */
-    if (buf_size == 0)
-        return 0;
-
-    if (!avctx->width || !avctx->height)
-       return -1;
-
-    buf_ptr = buf;
-    buf_end = buf + buf_size;
-
-#if 1
-    recoded = av_mallocz(buf_size + 1024);
-    if (!recoded)
-       return -1;
-
-    /* SOI */
-    recoded[j++] = 0xFF;
-    recoded[j++] = 0xD8;
-
-    memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
-    memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
-    memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
-    j += sizeof(sp5x_data_dqt);
-
-    memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
-    j += sizeof(sp5x_data_dht);
-
-    memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
-    recoded[j+5] = (avctx->coded_height >> 8) & 0xFF;
-    recoded[j+6] = avctx->coded_height & 0xFF;
-    recoded[j+7] = (avctx->coded_width >> 8) & 0xFF;
-    recoded[j+8] = avctx->coded_width & 0xFF;
-    j += sizeof(sp5x_data_sof);
-
-    memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
-    j += sizeof(sp5x_data_sos);
-
-    for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
-    {
-       recoded[j++] = buf[i];
-       if (buf[i] == 0xff)
-           recoded[j++] = 0;
-    }
-
-    /* EOI */
-    recoded[j++] = 0xFF;
-    recoded[j++] = 0xD9;
-
-    i = mjpeg_decode_frame(avctx, data, data_size, recoded, j);
-
-    av_free(recoded);
-
-#else
-    /* SOF */
-    s->bits = 8;
-    s->width  = avctx->coded_width;
-    s->height = avctx->coded_height;
-    s->nb_components = 3;
-    s->component_id[0] = 0;
-    s->h_count[0] = 2;
-    s->v_count[0] = 2;
-    s->quant_index[0] = 0;
-    s->component_id[1] = 1;
-    s->h_count[1] = 1;
-    s->v_count[1] = 1;
-    s->quant_index[1] = 1;
-    s->component_id[2] = 2;
-    s->h_count[2] = 1;
-    s->v_count[2] = 1;
-    s->quant_index[2] = 1;
-    s->h_max = 2;
-    s->v_max = 2;
-    
-    s->qscale_table = av_mallocz((s->width+15)/16);
-    avctx->pix_fmt = PIX_FMT_YUV420P;
-    s->interlaced = 0;
-    
-    s->picture.reference = 0;
-    if (avctx->get_buffer(avctx, &s->picture) < 0)
-    {
-       fprintf(stderr, "get_buffer() failed\n");
-       return -1;
-    }
-
-    s->picture.pict_type = I_TYPE;
-    s->picture.key_frame = 1;
-
-    for (i = 0; i < 3; i++)
-       s->linesize[i] = s->picture.linesize[i] << s->interlaced;
-
-    /* DQT */
-    for (i = 0; i < 64; i++)
-    {
-       j = s->scantable.permutated[i];
-       s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];
-    }
-    s->qscale[0] = FFMAX(
-       s->quant_matrixes[0][s->scantable.permutated[1]],
-       s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;
-
-    for (i = 0; i < 64; i++)
-    {
-       j = s->scantable.permutated[i];
-       s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];
-    }
-    s->qscale[1] = FFMAX(
-       s->quant_matrixes[1][s->scantable.permutated[1]],
-       s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;
-
-    /* DHT */
-
-    /* SOS */
-    s->comp_index[0] = 0;
-    s->nb_blocks[0] = s->h_count[0] * s->v_count[0];
-    s->h_scount[0] = s->h_count[0];
-    s->v_scount[0] = s->v_count[0];
-    s->dc_index[0] = 0;
-    s->ac_index[0] = 0;
-
-    s->comp_index[1] = 1;
-    s->nb_blocks[1] = s->h_count[1] * s->v_count[1];
-    s->h_scount[1] = s->h_count[1];
-    s->v_scount[1] = s->v_count[1];
-    s->dc_index[1] = 1;
-    s->ac_index[1] = 1;
-
-    s->comp_index[2] = 2;
-    s->nb_blocks[2] = s->h_count[2] * s->v_count[2];
-    s->h_scount[2] = s->h_count[2];
-    s->v_scount[2] = s->v_count[2];
-    s->dc_index[2] = 1;
-    s->ac_index[2] = 1;
-    
-    for (i = 0; i < 3; i++)
-       s->last_dc[i] = 1024;
-
-    s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8);
-    s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8);
-
-    init_get_bits(&s->gb, buf+14, (buf_size-14)*8);
-    
-    return mjpeg_decode_scan(s);
-#endif
-
-    return i;
-}
-
-static int mjpeg_decode_end(AVCodecContext *avctx)
-{
-    MJpegDecodeContext *s = avctx->priv_data;
-    int i, j;
-
-    av_free(s->buffer);
-    av_free(s->qscale_table);
-    
-    for(i=0;i<2;i++) {
-        for(j=0;j<4;j++)
-            free_vlc(&s->vlcs[i][j]);
-    }
-    return 0;
-}
-
-AVCodec mjpeg_decoder = {
-    "mjpeg",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_MJPEG,
-    sizeof(MJpegDecodeContext),
-    mjpeg_decode_init,
-    NULL,
-    mjpeg_decode_end,
-    mjpeg_decode_frame,
-    CODEC_CAP_DR1,
-    NULL
-};
-
-AVCodec mjpegb_decoder = {
-    "mjpegb",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_MJPEGB,
-    sizeof(MJpegDecodeContext),
-    mjpeg_decode_init,
-    NULL,
-    mjpeg_decode_end,
-    mjpegb_decode_frame,
-    CODEC_CAP_DR1,
-    NULL
-};
-
-AVCodec sp5x_decoder = {
-    "sp5x",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_SP5X,
-    sizeof(MJpegDecodeContext),
-    mjpeg_decode_init,
-    NULL,
-    mjpeg_decode_end,
-    sp5x_decode_frame,
-    CODEC_CAP_DR1,
-    NULL
-};
-
-#ifdef CONFIG_ENCODERS
-AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them
-    "ljpeg",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_LJPEG,
-    sizeof(MpegEncContext),
-    MPV_encode_init,
-    encode_picture_lossless,
-    MPV_encode_end,
-};
-#endif