split mjpeg.c into an encoder and a decoder file

Originally committed as revision 9048 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 1700 insertions, 0 deletions

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
new file mode 100644
index 0000000000..b3ced4d5fc
--- /dev/null
+++ b/libavcodec/mjpegdec.c
@@ -0,0 +1,1700 @@
+/*
+ * MJPEG decoder
+ * Copyright (c) 2000, 2001 Fabrice Bellard.
+ * Copyright (c) 2003 Alex Beregszaszi
+ * Copyright (c) 2003-2004 Michael Niedermayer
+ *
+ * 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 2.1 of the License, or (at your option) any later version.
+ *
+ * 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Support for external huffman table, various fixes (AVID workaround),
+ * aspecting, new decode_frame mechanism and apple mjpeg-b support
+ *                                  by Alex Beregszaszi
+ */
+
+/**
+ * @file mjpegdec.c
+ * MJPEG decoder.
+ */
+
+//#define DEBUG
+#include <assert.h>
+
+#include "avcodec.h"
+#include "dsputil.h"
+#include "bytestream.h"
+#include "mjpeg.h"
+#include "jpeglsdec.h"
+
+
+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, int use_static, int is_ac)
+{
+    uint8_t huff_size[256+16];
+    uint16_t huff_code[256+16];
+
+    assert(nb_codes <= 256);
+
+    memset(huff_size, 0, sizeof(huff_size));
+    build_huffman_codes(huff_size, huff_code, bits_table, val_table);
+
+    if(is_ac){
+        memmove(huff_size+16, huff_size, sizeof(uint8_t)*nb_codes);
+        memmove(huff_code+16, huff_code, sizeof(uint16_t)*nb_codes);
+        memset(huff_size, 0, sizeof(uint8_t)*16);
+        memset(huff_code, 0, sizeof(uint16_t)*16);
+        nb_codes += 16;
+    }
+
+    return init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, use_static);
+}
+
+static int mjpeg_decode_init(AVCodecContext *avctx)
+{
+    MJpegDecodeContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+    dsputil_init(&s->dsp, avctx);
+    ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
+    s->buffer_size = 0;
+    s->buffer = NULL;
+    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, 0, 0);
+    build_vlc(&s->vlcs[0][1], bits_dc_chrominance, val_dc_chrominance, 12, 0, 0);
+    build_vlc(&s->vlcs[1][0], bits_ac_luminance, val_ac_luminance, 251, 0, 1);
+    build_vlc(&s->vlcs[1][1], bits_ac_chrominance, val_ac_chrominance, 251, 0, 1);
+
+    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 */
+    }
+    if (avctx->extradata_size > 9 &&
+        AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) {
+        if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */
+            s->interlace_polarity = 1; /* bottom field first */
+            av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
+        }
+    }
+
+    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)
+        {
+            av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
+            return -1;
+        }
+        index = get_bits(&s->gb, 4);
+        if (index >= 4)
+            return -1;
+        av_log(s->avctx, AV_LOG_DEBUG, "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;
+        av_log(s->avctx, AV_LOG_DEBUG, "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]);
+        av_log(s->avctx, AV_LOG_DEBUG, "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, class > 0) < 0){
+            return -1;
+        }
+    }
+    return 0;
+}
+
+static int mjpeg_decode_sof(MJpegDecodeContext *s)
+{
+    int len, nb_components, i, width, height, pix_fmt_id;
+
+    /* 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);
+
+    //HACK for odd_height.mov
+    if(s->interlaced && s->width == width && s->height == height + 1)
+        height= s->height;
+
+    av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
+    if(avcodec_check_dimensions(s->avctx, width, height))
+        return -1;
+
+    nb_components = get_bits(&s->gb, 8);
+    if (nb_components <= 0 ||
+        nb_components > MAX_COMPONENTS)
+        return -1;
+    if (s->ls && !(s->bits <= 8 || nb_components == 1)){
+        av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
+        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;
+        av_log(s->avctx, AV_LOG_DEBUG, "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->ls && (s->h_max > 1 || s->v_max > 1)) {
+        av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
+        return -1;
+    }
+
+    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;
+        s->interlaced = 0;
+
+        /* 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;
+            s->picture.interlaced_frame = 1;
+            s->picture.top_field_first = !s->interlace_polarity;
+            height *= 2;
+        }
+
+        avcodec_set_dimensions(s->avctx, width, height);
+
+        s->qscale_table= av_mallocz((s->width+15)/16);
+
+        s->first_picture = 0;
+    }
+
+    if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
+        return 0;
+
+    /* XXX: not complete test ! */
+    pix_fmt_id = (s->h_count[0] << 20) | (s->v_count[0] << 16) |
+                 (s->h_count[1] << 12) | (s->v_count[1] <<  8) |
+                 (s->h_count[2] <<  4) |  s->v_count[2];
+    av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
+    switch(pix_fmt_id){
+    case 0x222222:
+    case 0x111111:
+        if(s->rgb){
+            s->avctx->pix_fmt = PIX_FMT_RGB32;
+        }else if(s->nb_components==3)
+            s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
+        else
+            s->avctx->pix_fmt = PIX_FMT_GRAY8;
+        break;
+    case 0x211111:
+    case 0x221212:
+        s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
+        break;
+    default:
+    case 0x221111:
+        s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
+        break;
+    }
+    if(s->ls){
+        if(s->nb_components > 1)
+            s->avctx->pix_fmt = PIX_FMT_RGB24;
+        else if(s->bits <= 8)
+            s->avctx->pix_fmt = PIX_FMT_GRAY8;
+        else
+            s->avctx->pix_fmt = PIX_FMT_GRAY16;
+    }
+
+    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)))
+    {
+        av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
+    }
+
+    /* totally blank picture as progressive JPEG will only add details to it */
+    if(s->progressive){
+        memset(s->picture.data[0], 0, s->picture.linesize[0] * s->height);
+        memset(s->picture.data[1], 0, s->picture.linesize[1] * s->height >> (s->v_max - s->v_count[1]));
+        memset(s->picture.data[2], 0, s->picture.linesize[2] * s->height >> (s->v_max - s->v_count[2]));
+    }
+    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)
+    {
+        av_log(s->avctx, AV_LOG_WARNING, "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, int16_t *quant_matrix)
+{
+    int code, i, j, level, val;
+
+    /* DC coef */
+    val = mjpeg_decode_dc(s, dc_index);
+    if (val == 0xffff) {
+        av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
+        return -1;
+    }
+    val = val * quant_matrix[0] + s->last_dc[component];
+    s->last_dc[component] = val;
+    block[0] = val;
+    /* AC coefs */
+    i = 0;
+    {OPEN_READER(re, &s->gb)
+    for(;;) {
+        UPDATE_CACHE(re, &s->gb);
+        GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
+
+        /* EOB */
+        if (code == 0x10)
+            break;
+        i += ((unsigned)code) >> 4;
+        if(code != 0x100){
+            code &= 0xf;
+            if(code > MIN_CACHE_BITS - 16){
+                UPDATE_CACHE(re, &s->gb)
+            }
+            {
+                int cache=GET_CACHE(re,&s->gb);
+                int sign=(~cache)>>31;
+                level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
+            }
+
+            LAST_SKIP_BITS(re, &s->gb, code)
+
+            if (i >= 63) {
+                if(i == 63){
+                    j = s->scantable.permutated[63];
+                    block[j] = level * quant_matrix[j];
+                    break;
+                }
+                av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
+                return -1;
+            }
+            j = s->scantable.permutated[i];
+            block[j] = level * quant_matrix[j];
+        }
+    }
+    CLOSE_READER(re, &s->gb)}
+
+    return 0;
+}
+
+/* decode block and dequantize - progressive JPEG version */
+static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
+                        int component, int dc_index, int ac_index, int16_t *quant_matrix,
+                        int ss, int se, int Ah, int Al, int *EOBRUN)
+{
+    int code, i, j, level, val, run;
+
+    /* DC coef */
+    if(!ss){
+        val = mjpeg_decode_dc(s, dc_index);
+        if (val == 0xffff) {
+            av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
+            return -1;
+        }
+        val = (val * quant_matrix[0] << Al) + s->last_dc[component];
+    }else
+        val = 0;
+    s->last_dc[component] = val;
+    block[0] = val;
+    if(!se) return 0;
+    /* AC coefs */
+    if(*EOBRUN){
+        (*EOBRUN)--;
+        return 0;
+    }
+    {OPEN_READER(re, &s->gb)
+    for(i=ss;;i++) {
+        UPDATE_CACHE(re, &s->gb);
+        GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
+        /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
+        code -= 16;
+        if(code & 0xF) {
+            i += ((unsigned) code) >> 4;
+            code &= 0xf;
+            if(code > MIN_CACHE_BITS - 16){
+                UPDATE_CACHE(re, &s->gb)
+            }
+            {
+                int cache=GET_CACHE(re,&s->gb);
+                int sign=(~cache)>>31;
+                level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
+            }
+
+            LAST_SKIP_BITS(re, &s->gb, code)
+
+            if (i >= se) {
+                if(i == se){
+                    j = s->scantable.permutated[se];
+                    block[j] = level * quant_matrix[j] << Al;
+                    break;
+                }
+                av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
+                return -1;
+            }
+            j = s->scantable.permutated[i];
+            block[j] = level * quant_matrix[j] << Al;
+        }else{
+            run = ((unsigned) code) >> 4;
+            if(run == 0xF){// ZRL - skip 15 coefficients
+                i += 15;
+            }else{
+                val = run;
+                run = (1 << run);
+                UPDATE_CACHE(re, &s->gb);
+                run += (GET_CACHE(re, &s->gb) >> (32 - val)) & (run - 1);
+                if(val)
+                    LAST_SKIP_BITS(re, &s->gb, val);
+                *EOBRUN = run - 1;
+                break;
+            }
+        }
+    }
+    CLOSE_READER(re, &s->gb)}
+
+    return 0;
+}
+
+static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
+    int i, mb_x, mb_y;
+    uint16_t buffer[32768][4];
+    int left[3], top[3], topleft[3];
+    const int linesize= s->linesize[0];
+    const int mask= (1<<s->bits)-1;
+
+    if((unsigned)s->mb_width > 32768) //dynamic alloc
+        return -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 nb_components, int ss, int se, int Ah, int Al){
+    int i, mb_x, mb_y;
+    int EOBRUN = 0;
+
+    if(Ah) return 0; /* TODO decode refinement planes too */
+    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 (!s->progressive && decode_block(s, s->block, i,
+                                     s->dc_index[i], s->ac_index[i],
+                                     s->quant_matrixes[ s->quant_index[c] ]) < 0) {
+                        av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
+                        return -1;
+                    }
+                    if (s->progressive && decode_block_progressive(s, s->block, i,
+                                     s->dc_index[i], s->ac_index[i],
+                                     s->quant_matrixes[ s->quant_index[c] ], ss, se, Ah, Al, &EOBRUN) < 0) {
+                        av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
+                        return -1;
+                    }
+//                    av_log(s->avctx, AV_LOG_DEBUG, "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);
+                    if(!s->progressive)
+                        s->dsp.idct_put(ptr, s->linesize[c], s->block);
+                    else
+                        s->dsp.idct_add(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;
+    int ilv, prev_shift;
+
+    /* XXX: verify len field validity */
+    len = get_bits(&s->gb, 16);
+    nb_components = get_bits(&s->gb, 8);
+    if (len != 6+2*nb_components)
+    {
+        av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
+        return -1;
+    }
+    vmax = 0;
+    hmax = 0;
+    for(i=0;i<nb_components;i++) {
+        id = get_bits(&s->gb, 8) - 1;
+        av_log(s->avctx, AV_LOG_DEBUG, "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)
+        {
+            av_log(s->avctx, AV_LOG_ERROR, "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); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
+    ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */
+    prev_shift = get_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 if(!s->ls) { /* skip this for JPEG-LS */
+        h = s->h_max / s->h_scount[0];
+        v = s->v_max / s->v_scount[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 ilv:%d bits:%d %s\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "",
+               predictor, point_transform, ilv, s->bits,
+               s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
+
+
+    /* mjpeg-b can have padding bytes between sos and image data, skip them */
+    for (i = s->mjpb_skiptosod; i > 0; i--)
+        skip_bits(&s->gb, 8);
+
+    if(s->lossless){
+        if(s->ls){
+//            for(){
+//            reset_ls_coding_parameters(s, 0);
+
+            ff_jpegls_decode_picture(s, predictor, point_transform, ilv);
+        }else{
+            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, nb_components, predictor, ilv, prev_shift, point_transform) < 0)
+            return -1;
+    }
+    emms_c();
+    return 0;
+ out_of_range:
+    av_log(s->avctx, AV_LOG_ERROR, "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);
+    s->restart_count = 0;
+    av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
+
+    return 0;
+}
+
+static int mjpeg_decode_app(MJpegDecodeContext *s)
+{
+    int len, id, i;
+
+    len = get_bits(&s->gb, 16);
+    if (len < 5)
+        return -1;
+    if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
+        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");
+        i = get_bits(&s->gb, 8);
+        if     (i==2) s->bottom_field= 1;
+        else if(i==1) s->bottom_field= 0;
+#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)
+{
+    int len = get_bits(&s->gb, 16);
+    if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
+        char *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");
+            }
+            else if(!strcmp(cbuf, "CS=ITU601")){
+                s->cs_itu601= 1;
+            }
+
+            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
+    av_log(NULL, AV_LOG_VERBOSE, "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;
+
+    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 {
+                av_log(avctx, AV_LOG_DEBUG, "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 + FF_INPUT_BUFFER_PADDING_SIZE);
+                    av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
+                        s->buffer_size);
+                }
+
+                /* unescape buffer of SOS, use special treatment for JPEG-LS */
+                if (start_code == SOS && !s->ls)
+                {
+                    uint8_t *src = buf_ptr;
+                    uint8_t *dst = s->buffer;
+
+                    while (src<buf_end)
+                    {
+                        uint8_t x = *(src++);
+
+                        *(dst++) = x;
+                        if (avctx->codec_id != CODEC_ID_THP)
+                        {
+                            if (x == 0xff) {
+                                while (src < buf_end && x == 0xff)
+                                    x = *(src++);
+
+                                if (x >= 0xd0 && x <= 0xd7)
+                                    *(dst++) = x;
+                                else if (x)
+                                    break;
+                            }
+                        }
+                    }
+                    init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
+
+                    av_log(avctx, AV_LOG_DEBUG, "escaping removed %d bytes\n",
+                           (buf_end - buf_ptr) - (dst - s->buffer));
+                }
+                else if(start_code == SOS && s->ls){
+                    uint8_t *src = buf_ptr;
+                    uint8_t *dst = s->buffer;
+                    int bit_count = 0;
+                    int t = 0, b = 0;
+                    PutBitContext pb;
+
+                    s->cur_scan++;
+
+                    /* find marker */
+                    while (src + t < buf_end){
+                        uint8_t x = src[t++];
+                        if (x == 0xff){
+                            while((src + t < buf_end) && x == 0xff)
+                                x = src[t++];
+                            if (x & 0x80) {
+                                t -= 2;
+                                break;
+                            }
+                        }
+                    }
+                    bit_count = t * 8;
+
+                    init_put_bits(&pb, dst, t);
+
+                    /* unescape bitstream */
+                    while(b < t){
+                        uint8_t x = src[b++];
+                        put_bits(&pb, 8, x);
+                        if(x == 0xFF){
+                            x = src[b++];
+                            put_bits(&pb, 7, x);
+                            bit_count--;
+                        }
+                    }
+                    flush_put_bits(&pb);
+
+                    init_get_bits(&s->gb, dst, bit_count);
+                }
+                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(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
+                }
+
+                /* process markers */
+                if (start_code >= 0xd0 && start_code <= 0xd7) {
+                    av_log(avctx, AV_LOG_DEBUG, "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;
+
+                    s->restart_count = 0;
+                    /* nothing to do on SOI */
+                    break;
+                case DQT:
+                    mjpeg_decode_dqt(s);
+                    break;
+                case DHT:
+                    if(mjpeg_decode_dht(s) < 0){
+                        av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
+                        return -1;
+                    }
+                    break;
+                case SOF0:
+                    s->lossless=0;
+                    s->ls=0;
+                    s->progressive=0;
+                    if (mjpeg_decode_sof(s) < 0)
+                        return -1;
+                    break;
+                case SOF2:
+                    s->lossless=0;
+                    s->ls=0;
+                    s->progressive=1;
+                    if (mjpeg_decode_sof(s) < 0)
+                        return -1;
+                    break;
+                case SOF3:
+                    s->lossless=1;
+                    s->ls=0;
+                    s->progressive=0;
+                    if (mjpeg_decode_sof(s) < 0)
+                        return -1;
+                    break;
+                case SOF48:
+                    s->lossless=1;
+                    s->ls=1;
+                    s->progressive=0;
+                    if (mjpeg_decode_sof(s) < 0)
+                        return -1;
+                    break;
+                case LSE:
+                    if (ff_jpegls_decode_lse(s) < 0)
+                        return -1;
+                    break;
+                case EOI:
+                    s->cur_scan = 0;
+                    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 == !s->interlace_polarity)
+                                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(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 SOF5:
+                case SOF6:
+                case SOF7:
+                case SOF9:
+                case SOF10:
+                case SOF11:
+                case SOF13:
+                case SOF14:
+                case SOF15:
+                case JPG:
+                    av_log(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;
+                av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
+                       (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
+            }
+        }
+    }
+the_end:
+    av_log(avctx, AV_LOG_DEBUG, "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, sod_offs;
+
+    buf_ptr = buf;
+    buf_end = buf + buf_size;
+
+read_header:
+    /* reset on every SOI */
+    s->restart_interval = 0;
+    s->restart_count = 0;
+    s->mjpb_skiptosod = 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) != MKBETAG('m','j','p','g'))
+    {
+        av_log(avctx, AV_LOG_WARNING, "not mjpeg-b (bad fourcc)\n");
+        return 0;
+    }
+
+    field_size = get_bits_long(&hgb, 32); /* field size */
+    av_log(avctx, AV_LOG_DEBUG, "field size: 0x%x\n", field_size);
+    skip_bits(&hgb, 32); /* padded field size */
+    second_field_offs = get_bits_long(&hgb, 32);
+    av_log(avctx, AV_LOG_DEBUG, "second field offs: 0x%x\n", second_field_offs);
+
+    dqt_offs = get_bits_long(&hgb, 32);
+    av_log(avctx, AV_LOG_DEBUG, "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);
+    av_log(avctx, AV_LOG_DEBUG, "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);
+    av_log(avctx, AV_LOG_DEBUG, "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);
+    av_log(avctx, AV_LOG_DEBUG, "sos offs: 0x%x\n", sos_offs);
+    sod_offs = get_bits_long(&hgb, 32);
+    av_log(avctx, AV_LOG_DEBUG, "sod offs: 0x%x\n", sod_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->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));
+        s->start_code = SOS;
+        mjpeg_decode_sos(s);
+    }
+
+    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;
+
+    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 = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;
+    s->interlaced = 0;
+
+    s->picture.reference = 0;
+    if (avctx->get_buffer(avctx, &s->picture) < 0)
+    {
+        av_log(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;
+
+    /* 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;
+}
+
+static int mjpega_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
+                              uint8_t **poutbuf, int *poutbuf_size,
+                              const uint8_t *buf, int buf_size, int keyframe)
+{
+    uint8_t *poutbufp;
+    int i;
+
+    if (avctx->codec_id != CODEC_ID_MJPEG) {
+        av_log(avctx, AV_LOG_ERROR, "mjpega bitstream filter only applies to mjpeg codec\n");
+        return 0;
+    }
+
+    *poutbuf_size = 0;
+    *poutbuf = av_malloc(buf_size + 44 + FF_INPUT_BUFFER_PADDING_SIZE);
+    poutbufp = *poutbuf;
+    bytestream_put_byte(&poutbufp, 0xff);
+    bytestream_put_byte(&poutbufp, SOI);
+    bytestream_put_byte(&poutbufp, 0xff);
+    bytestream_put_byte(&poutbufp, APP1);
+    bytestream_put_be16(&poutbufp, 42); /* size */
+    bytestream_put_be32(&poutbufp, 0);
+    bytestream_put_buffer(&poutbufp, "mjpg", 4);
+    bytestream_put_be32(&poutbufp, buf_size + 44); /* field size */
+    bytestream_put_be32(&poutbufp, buf_size + 44); /* pad field size */
+    bytestream_put_be32(&poutbufp, 0);             /* next ptr */
+
+    for (i = 0; i < buf_size - 1; i++) {
+        if (buf[i] == 0xff) {
+            switch (buf[i + 1]) {
+            case DQT:  /* quant off */
+            case DHT:  /* huff  off */
+            case SOF0: /* image off */
+                bytestream_put_be32(&poutbufp, i + 46);
+                break;
+            case SOS:
+                bytestream_put_be32(&poutbufp, i + 46); /* scan off */
+                bytestream_put_be32(&poutbufp, i + 46 + AV_RB16(buf + i + 2)); /* data off */
+                bytestream_put_buffer(&poutbufp, buf + 2, buf_size - 2); /* skip already written SOI */
+                *poutbuf_size = poutbufp - *poutbuf;
+                return 1;
+            case APP1:
+                if (i + 8 < buf_size && AV_RL32(buf + i + 8) == ff_get_fourcc("mjpg")) {
+                    av_log(avctx, AV_LOG_ERROR, "bitstream already formatted\n");
+                    memcpy(*poutbuf, buf, buf_size);
+                    *poutbuf_size = buf_size;
+                    return 1;
+                }
+            }
+        }
+    }
+    av_freep(poutbuf);
+    av_log(avctx, AV_LOG_ERROR, "could not find SOS marker in bitstream\n");
+    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 thp_decoder = {
+    "thp",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_THP,
+    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_MJPEGA_DUMP_HEADER_BSF
+AVBitStreamFilter mjpega_dump_header_bsf = {
+    "mjpegadump",
+    0,
+    mjpega_dump_header,
+};
+#endif