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FFmpeg/libavcodec/mjpegdec.c
Reinhard Tartler 737eb5976f Merge libavcore into libavutil 
It is pretty hopeless that other considerable projects will adopt
libavutil alone in other projects. Projects that need small footprint
are better off with more specialized libraries such as gnulib or rather
just copy the necessary parts that they need. With this in mind, nobody
is helped by having libavutil and libavcore split. In order to ease
maintenance inside and around FFmpeg and to reduce confusion where to
put common code, avcore's functionality is merged (back) to avutil.

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
2011-02-15 16:18:21 +01:00

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/*
* MJPEG decoder
* Copyright (c) 2000, 2001 Fabrice Bellard
* Copyright (c) 2003 Alex Beregszaszi
* Copyright (c) 2003-2004 Michael Niedermayer
*
* 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 2.1 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
*/
/**
* @file
* MJPEG decoder.
*/
//#define DEBUG
#include <assert.h>
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "dsputil.h"
#include "mjpeg.h"
#include "mjpegdec.h"
#include "jpeglsdec.h"
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];
uint16_t huff_code[256];
uint16_t huff_sym[256];
int i;
assert(nb_codes <= 256);
memset(huff_size, 0, sizeof(huff_size));
ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
for(i=0; i<256; i++)
huff_sym[i]= i + 16*is_ac;
if(is_ac) huff_sym[0]= 16*256;
return init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, huff_sym, 2, 2, use_static);
}
static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {
build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,
ff_mjpeg_val_dc, 12, 0, 0);
build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
ff_mjpeg_val_dc, 12, 0, 0);
build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
ff_mjpeg_val_ac_luminance, 251, 0, 1);
build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
ff_mjpeg_val_ac_chrominance, 251, 0, 1);
build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,
ff_mjpeg_val_ac_luminance, 251, 0, 0);
build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,
ff_mjpeg_val_ac_chrominance, 251, 0, 0);
}
av_cold int ff_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;
avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
build_basic_mjpeg_vlc(s);
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);
if (ff_mjpeg_decode_dht(s)) {
av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table, switching back to internal\n");
build_basic_mjpeg_vlc(s);
}
}
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");
}
}
if (avctx->codec->id == CODEC_ID_AMV)
s->flipped = 1;
return 0;
}
/* quantize tables */
int ff_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 */
int ff_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;
}
if(class>0){
free_vlc(&s->vlcs[2][index]);
if(build_vlc(&s->vlcs[2][index], bits_table, val_table, code_max + 1, 0, 0) < 0){
return -1;
}
}
}
return 0;
}
int ff_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(av_image_check_size(width, height, 0, s->avctx))
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] << 28) | (s->v_count[0] << 24) |
(s->h_count[1] << 20) | (s->v_count[1] << 16) |
(s->h_count[2] << 12) | (s->v_count[2] << 8) |
(s->h_count[3] << 4) | s->v_count[3];
av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
//NOTE we do not allocate pictures large enough for the possible padding of h/v_count being 4
if(!(pix_fmt_id & 0xD0D0D0D0))
pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1;
if(!(pix_fmt_id & 0x0D0D0D0D))
pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1;
switch(pix_fmt_id){
case 0x11111100:
if(s->rgb){
s->avctx->pix_fmt = PIX_FMT_BGRA;
}else
s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
assert(s->nb_components==3);
break;
case 0x11000000:
s->avctx->pix_fmt = PIX_FMT_GRAY8;
break;
case 0x12111100:
s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
break;
case 0x21111100:
s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
break;
case 0x22111100:
s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
return -1;
}
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= FF_I_TYPE;
s->picture.key_frame= 1;
s->got_picture = 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){
int bw = (width + s->h_max*8-1) / (s->h_max*8);
int bh = (height + s->v_max*8-1) / (s->v_max*8);
for(i=0; i<s->nb_components; i++) {
int size = bw * bh * s->h_count[i] * s->v_count[i];
av_freep(&s->blocks[i]);
av_freep(&s->last_nnz[i]);
s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
s->block_stride[i] = bw * s->h_count[i];
}
memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
}
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);
do {
UPDATE_CACHE(re, &s->gb);
GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
i += ((unsigned)code) >> 4;
code &= 0xf;
if(code){
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) {
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];
}
}while(i<63);
CLOSE_READER(re, &s->gb);}
return 0;
}
static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,
int dc_index, int16_t *quant_matrix, int Al)
{
int val;
s->dsp.clear_block(block);
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];
s->last_dc[component] = val;
block[0] = val;
return 0;
}
/* decode block and dequantize - progressive JPEG version */
static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
int ac_index, int16_t *quant_matrix,
int ss, int se, int Al, int *EOBRUN)
{
int code, i, j, level, val, run;
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[2][ac_index].table, 9, 2);
run = ((unsigned) code) >> 4;
code &= 0xF;
if(code) {
i += run;
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{
if(run == 0xF){// ZRL - skip 15 coefficients
i += 15;
if (i >= se) {
av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
return -1;
}
}else{
val = (1 << run);
if(run){
UPDATE_CACHE(re, &s->gb);
val += NEG_USR32(GET_CACHE(re, &s->gb), run);
LAST_SKIP_BITS(re, &s->gb, run);
}
*EOBRUN = val - 1;
break;
}
}
}
CLOSE_READER(re, &s->gb);}
if(i > *last_nnz)
*last_nnz = i;
return 0;
}
#define REFINE_BIT(j) {\
UPDATE_CACHE(re, &s->gb);\
sign = block[j]>>15;\
block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\
LAST_SKIP_BITS(re, &s->gb, 1);\
}
#define ZERO_RUN \
for(;;i++) {\
if(i > last) {\
i += run;\
if(i > se) {\
av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\
return -1;\
}\
break;\
}\
j = s->scantable.permutated[i];\
if(block[j])\
REFINE_BIT(j)\
else if(run-- == 0)\
break;\
}
/* decode block and dequantize - progressive JPEG refinement pass */
static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
int ac_index, int16_t *quant_matrix,
int ss, int se, int Al, int *EOBRUN)
{
int code, i=ss, j, sign, val, run;
int last = FFMIN(se, *last_nnz);
OPEN_READER(re, &s->gb);
if(*EOBRUN)
(*EOBRUN)--;
else {
for(;;i++) {
UPDATE_CACHE(re, &s->gb);
GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
if(code & 0xF) {
run = ((unsigned) code) >> 4;
UPDATE_CACHE(re, &s->gb);
val = SHOW_UBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
ZERO_RUN;
j = s->scantable.permutated[i];
val--;
block[j] = ((quant_matrix[j]^val)-val) << Al;
if(i == se) {
if(i > *last_nnz)
*last_nnz = i;
CLOSE_READER(re, &s->gb);
return 0;
}
}else{
run = ((unsigned) code) >> 4;
if(run == 0xF){
ZERO_RUN;
}else{
val = run;
run = (1 << run);
if(val) {
UPDATE_CACHE(re, &s->gb);
run += SHOW_UBITS(re, &s->gb, val);
LAST_SKIP_BITS(re, &s->gb, val);
}
*EOBRUN = run - 1;
break;
}
}
}
if(i > *last_nnz)
*last_nnz = i;
}
for(;i<=last;i++) {
j = s->scantable.permutated[i];
if(block[j])
REFINE_BIT(j)
}
CLOSE_READER(re, &s->gb);
return 0;
}
#undef REFINE_BIT
#undef ZERO_RUN
static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
int i, mb_x, mb_y;
uint16_t (*buffer)[4];
int left[3], top[3], topleft[3];
const int linesize= s->linesize[0];
const int mask= (1<<s->bits)-1;
av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
buffer= s->ljpeg_buffer;
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][2];
ptr[4*mb_x+1] = buffer[mb_x][1];
ptr[4*mb_x+2] = buffer[mb_x][0];
}
}
}
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 Ah, int Al){
int i, mb_x, mb_y;
uint8_t* data[MAX_COMPONENTS];
int linesize[MAX_COMPONENTS];
if(s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
s->flipped = 0;
}
for(i=0; i < nb_components; i++) {
int c = s->comp_index[i];
data[c] = s->picture.data[c];
linesize[c]=s->linesize[c];
s->coefs_finished[c] |= 1;
if(s->flipped) {
//picture should be flipped upside-down for this codec
data[c] += (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
linesize[c] *= -1;
}
}
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++) {
ptr = data[c] +
(((linesize[c] * (v * mb_y + y) * 8) +
(h * mb_x + x) * 8) >> s->avctx->lowres);
if(s->interlaced && s->bottom_field)
ptr += linesize[c] >> 1;
if(!s->progressive) {
s->dsp.clear_block(s->block);
if(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;
}
s->dsp.idct_put(ptr, linesize[c], s->block);
} else {
int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);
DCTELEM *block = s->blocks[c][block_idx];
if(Ah)
block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;
else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 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);
//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 (++x == h) {
x = 0;
y++;
}
}
}
if (s->restart_interval && !--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_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){
int mb_x, mb_y;
int EOBRUN = 0;
int c = s->comp_index[0];
uint8_t* data = s->picture.data[c];
int linesize = s->linesize[c];
int last_scan = 0;
int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];
if(!Al) {
s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
last_scan = !~s->coefs_finished[c];
}
if(s->interlaced && s->bottom_field)
data += linesize >> 1;
for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);
int block_idx = mb_y * s->block_stride[c];
DCTELEM (*block)[64] = &s->blocks[c][block_idx];
uint8_t *last_nnz = &s->last_nnz[c][block_idx];
for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
int ret;
if(Ah)
ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
quant_matrix, ss, se, Al, &EOBRUN);
else
ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
quant_matrix, ss, se, Al, &EOBRUN);
if(ret < 0) {
av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
return -1;
}
if(last_scan) {
s->dsp.idct_put(ptr, linesize, *block);
ptr += 8 >> s->avctx->lowres;
}
}
}
return 0;
}
int ff_mjpeg_decode_sos(MJpegDecodeContext *s)
{
int len, nb_components, i, h, v, predictor, point_transform;
int 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 (nb_components == 0 || nb_components > MAX_COMPONENTS){
av_log(s->avctx, AV_LOG_ERROR, "decode_sos: nb_components (%d) unsupported\n", nb_components);
return -1;
}
if (len != 6+2*nb_components)
{
av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
return -1;
}
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;
}
/* Metasoft MJPEG codec has Cb and Cr swapped */
if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
&& nb_components == 3 && s->nb_components == 3 && i)
index = 3 - i;
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 (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)
goto out_of_range;
}
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" : "sequential 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(CONFIG_JPEGLS_DECODER && s->ls){
// for(){
// reset_ls_coding_parameters(s, 0);
if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
return -1;
}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(s->progressive && predictor) {
if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)
return -1;
} else {
if(mjpeg_decode_scan(s, nb_components, 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_long(&s->gb, 32);
id = av_be2ne32(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 == AV_RL32("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 == AV_RL32("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 == AV_RL32("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 == AV_RL32("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_long(&s->gb, 32);
id = av_be2ne32(id);
len -= 4;
if (id == AV_RL32("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;
}
else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
(len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){
s->flipped = 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(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
{
const 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:
av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
*pbuf_ptr = buf_ptr;
return val;
}
int ff_mjpeg_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MJpegDecodeContext *s = avctx->priv_data;
const uint8_t *buf_end, *buf_ptr;
int start_code;
AVFrame *picture = data;
s->got_picture = 0; // picture from previous image can not be reused
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=%td\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)
{
const 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 %td bytes\n",
(buf_end - buf_ptr) - (dst - s->buffer));
}
else if(start_code == SOS && s->ls){
const 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:
ff_mjpeg_decode_dqt(s);
break;
case DHT:
if(ff_mjpeg_decode_dht(s) < 0){
av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
return -1;
}
break;
case SOF0:
case SOF1:
s->lossless=0;
s->ls=0;
s->progressive=0;
if (ff_mjpeg_decode_sof(s) < 0)
return -1;
break;
case SOF2:
s->lossless=0;
s->ls=0;
s->progressive=1;
if (ff_mjpeg_decode_sof(s) < 0)
return -1;
break;
case SOF3:
s->lossless=1;
s->ls=0;
s->progressive=0;
if (ff_mjpeg_decode_sof(s) < 0)
return -1;
break;
case SOF48:
s->lossless=1;
s->ls=1;
s->progressive=0;
if (ff_mjpeg_decode_sof(s) < 0)
return -1;
break;
case LSE:
if (!CONFIG_JPEGLS_DECODER || 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->got_picture) {
av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");
break;
}
{
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= FFMAX3(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:
if (!s->got_picture) {
av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");
break;
}
ff_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 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));
}
}
}
if (s->got_picture) {
av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
goto eoi_parser;
}
av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
return -1;
the_end:
av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
// return buf_end - buf_ptr;
return buf_ptr - buf;
}
av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
{
MJpegDecodeContext *s = avctx->priv_data;
int i, j;
if (s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
av_free(s->buffer);
av_free(s->qscale_table);
av_freep(&s->ljpeg_buffer);
s->ljpeg_buffer_size=0;
for(i=0;i<3;i++) {
for(j=0;j<4;j++)
free_vlc(&s->vlcs[i][j]);
}
for(i=0; i<MAX_COMPONENTS; i++) {
av_freep(&s->blocks[i]);
av_freep(&s->last_nnz[i]);
}
return 0;
}
AVCodec ff_mjpeg_decoder = {
"mjpeg",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_MJPEG,
sizeof(MJpegDecodeContext),
ff_mjpeg_decode_init,
NULL,
ff_mjpeg_decode_end,
ff_mjpeg_decode_frame,
CODEC_CAP_DR1,
NULL,
.max_lowres = 4,
.long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
};
AVCodec ff_thp_decoder = {
"thp",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_THP,
sizeof(MJpegDecodeContext),
ff_mjpeg_decode_init,
NULL,
ff_mjpeg_decode_end,
ff_mjpeg_decode_frame,
CODEC_CAP_DR1,
NULL,
.max_lowres = 3,
.long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
};
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