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b6293e2798
FFmpeg/libavcodec/mjpegdec.c
Luca Barbato 6765ee7b9c mjpeg: Check the unescaped size for overflows 
And contextually check init_get_bits success and fix the reporting
message.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
2013-06-30 08:48:51 +02:00

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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 Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; 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 "libavutil/opt.h"
#include "avcodec.h"
#include "internal.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] = { 0 };
uint16_t huff_code[256];
uint16_t huff_sym[256];
int i;
assert(nb_codes <= 256);
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 ff_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], avpriv_mjpeg_bits_dc_luminance,
avpriv_mjpeg_val_dc, 12, 0, 0);
build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance,
avpriv_mjpeg_val_dc, 12, 0, 0);
build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,
avpriv_mjpeg_val_ac_luminance, 251, 0, 1);
build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,
avpriv_mjpeg_val_ac_chrominance, 251, 0, 1);
build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,
avpriv_mjpeg_val_ac_luminance, 251, 0, 0);
build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,
avpriv_mjpeg_val_ac_chrominance, 251, 0, 0);
}
av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
{
MJpegDecodeContext *s = avctx->priv_data;
if (!s->picture_ptr)
s->picture_ptr = &s->picture;
s->avctx = avctx;
ff_hpeldsp_init(&s->hdsp, avctx->flags);
ff_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 (s->extern_huff) {
int ret;
av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
if ((ret = ff_mjpeg_decode_dht(s))) {
av_log(avctx, AV_LOG_ERROR,
"mjpeg: error using external huffman table\n");
return ret;
}
}
if (avctx->field_order == AV_FIELD_BB) { /* 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 == AV_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];
int ret = 0;
len = get_bits(&s->gb, 16) - 2;
while (len > 0) {
if (len < 17)
return AVERROR_INVALIDDATA;
class = get_bits(&s->gb, 4);
if (class >= 2)
return AVERROR_INVALIDDATA;
index = get_bits(&s->gb, 4);
if (index >= 4)
return AVERROR_INVALIDDATA;
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 AVERROR_INVALIDDATA;
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 */
ff_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 ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,
code_max + 1, 0, class > 0)) < 0)
return ret;
if (class > 0) {
ff_free_vlc(&s->vlcs[2][index]);
if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,
code_max + 1, 0, 0)) < 0)
return ret;
}
}
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 AVERROR_INVALIDDATA;
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)) {
avpriv_report_missing_feature(s->avctx,
"JPEG-LS that is not <= 8 "
"bits/component or 16-bit gray");
return AVERROR_PATCHWELCOME;
}
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 AVERROR_INVALIDDATA;
if (!s->h_count[i] || !s->v_count[i]) {
av_log(s->avctx, AV_LOG_ERROR,
"Invalid sampling factor in component %d %d:%d\n",
i, s->h_count[i], s->v_count[i]);
return AVERROR_INVALIDDATA;
}
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)) {
avpriv_report_missing_feature(s->avctx, "Subsampling in JPEG-LS");
return AVERROR_PATCHWELCOME;
}
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) {
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_ptr->interlaced_frame = 1;
s->picture_ptr->top_field_first = !s->interlace_polarity;
height *= 2;
}
avcodec_set_dimensions(s->avctx, width, height);
s->first_picture = 0;
}
if (!(s->interlaced && (s->bottom_field == !s->interlace_polarity))) {
/* 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 = AV_PIX_FMT_BGRA;
else
s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
assert(s->nb_components == 3);
break;
case 0x11000000:
s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
break;
case 0x12111100:
s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P;
break;
case 0x21111100:
s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
break;
case 0x22111100:
s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P;
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
return AVERROR_PATCHWELCOME;
}
if (s->ls) {
if (s->nb_components > 1)
s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
else if (s->bits <= 8)
s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
else
s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
}
av_frame_unref(s->picture_ptr);
if (ff_get_buffer(s->avctx, s->picture_ptr, AV_GET_BUFFER_FLAG_REF) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
s->picture_ptr->key_frame = 1;
s->got_picture = 1;
for (i = 0; i < 3; i++)
s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
av_dlog(s->avctx, "%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, int16_t *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 AVERROR_INVALIDDATA;
}
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 AVERROR_INVALIDDATA;
}
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, int16_t *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 AVERROR_INVALIDDATA;
}
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, int16_t *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 AVERROR_INVALIDDATA;
}
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 AVERROR_INVALIDDATA;
}
} 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, int16_t *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_ptr->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 nb_components)
{
int i, mb_x, mb_y;
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;
// FIXME optimize this crap
ptr = s->picture_ptr->data[c] +
(linesize * (v * mb_y + y)) +
(h * mb_x + x);
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;
// FIXME optimize this crap
ptr = s->picture_ptr->data[c] +
(linesize * (v * mb_y + y)) +
(h * mb_x + x);
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, const uint8_t *mb_bitmask,
const AVFrame *reference)
{
int i, mb_x, mb_y;
uint8_t *data[MAX_COMPONENTS];
const uint8_t *reference_data[MAX_COMPONENTS];
int linesize[MAX_COMPONENTS];
GetBitContext mb_bitmask_gb;
if (mb_bitmask)
init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
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_ptr->data[c];
reference_data[c] = reference ? reference->data[c] : NULL;
linesize[c] = s->linesize[c];
s->coefs_finished[c] |= 1;
if (s->flipped) {
// picture should be flipped upside-down for this codec
int offset = (linesize[c] * (s->v_scount[i] *
(8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
data[c] += offset;
reference_data[c] += offset;
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++) {
const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
if (s->restart_interval && !s->restart_count)
s->restart_count = s->restart_interval;
if (get_bits_left(&s->gb) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
-get_bits_left(&s->gb));
return AVERROR_INVALIDDATA;
}
for (i = 0; i < nb_components; i++) {
uint8_t *ptr;
int n, h, v, x, y, c, j;
int block_offset;
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++) {
block_offset = ((linesize[c] * (v * mb_y + y) * 8) +
(h * mb_x + x) * 8);
if (s->interlaced && s->bottom_field)
block_offset += linesize[c] >> 1;
ptr = data[c] + block_offset;
if (!s->progressive) {
if (copy_mb)
s->hdsp.put_pixels_tab[1][0](ptr,
reference_data[c] + block_offset,
linesize[c], 8);
else {
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 AVERROR_INVALIDDATA;
}
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);
int16_t *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 AVERROR_INVALIDDATA;
}
}
av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
av_dlog(s->avctx, "%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--;
i = 8 + ((-get_bits_count(&s->gb)) & 7);
/* skip RSTn */
if (show_bits(&s->gb, i) == (1 << i) - 1) {
int pos = get_bits_count(&s->gb);
align_get_bits(&s->gb);
while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
skip_bits(&s->gb, 8);
if ((get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
for (i = 0; i < nb_components; i++) /* reset dc */
s->last_dc[i] = 1024;
} else
skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
}
}
}
}
return 0;
}
static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
int se, int Ah, int Al,
const uint8_t *mb_bitmask,
const AVFrame *reference)
{
int mb_x, mb_y;
int EOBRUN = 0;
int c = s->comp_index[0];
uint8_t *data = s->picture_ptr->data[c];
const uint8_t *reference_data = reference ? reference->data[c] : NULL;
int linesize = s->linesize[c];
int last_scan = 0;
int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
GetBitContext mb_bitmask_gb;
if (ss < 0 || ss >= 64 ||
se < ss || se >= 64 ||
Ah < 0 || Al < 0)
return AVERROR_INVALIDDATA;
if (mb_bitmask)
init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
if (!Al) {
s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
last_scan = !~s->coefs_finished[c];
}
if (s->interlaced && s->bottom_field) {
int offset = linesize >> 1;
data += offset;
reference_data += offset;
}
for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
int block_offset = mb_y * linesize * 8;
uint8_t *ptr = data + block_offset;
int block_idx = mb_y * s->block_stride[c];
int16_t (*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++) {
const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
if (!copy_mb) {
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 AVERROR_INVALIDDATA;
}
}
if (last_scan) {
if (copy_mb) {
s->hdsp.put_pixels_tab[1][0](ptr,
reference_data + block_offset,
linesize, 8);
} else {
s->dsp.idct_put(ptr, linesize, *block);
ptr += 8;
}
}
}
}
return 0;
}
int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
const AVFrame *reference)
{
int len, nb_components, i, h, v, predictor, point_transform;
int index, id, ret;
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 AVERROR_PATCHWELCOME;
}
if (len != 6 + 2 * nb_components) {
av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
return AVERROR_INVALIDDATA;
}
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 AVERROR_INVALIDDATA;
}
/* 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 */
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);
next_field:
for (i = 0; i < nb_components; i++)
s->last_dc[i] = 1024;
if (s->lossless) {
if (CONFIG_JPEGLS_DECODER && s->ls) {
// for () {
// reset_ls_coding_parameters(s, 0);
if ((ret = ff_jpegls_decode_picture(s, predictor,
point_transform, ilv)) < 0)
return ret;
} else {
if (s->rgb) {
if ((ret = ljpeg_decode_rgb_scan(s, predictor,
point_transform)) < 0)
return ret;
} else {
if ((ret = ljpeg_decode_yuv_scan(s, predictor,
point_transform,
nb_components)) < 0)
return ret;
}
}
} else {
if (s->progressive && predictor) {
if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
ilv, prev_shift,
point_transform,
mb_bitmask,
reference)) < 0)
return ret;
} else {
if ((ret = mjpeg_decode_scan(s, nb_components,
prev_shift, point_transform,
mb_bitmask, reference)) < 0)
return ret;
}
}
if (s->interlaced &&
get_bits_left(&s->gb) > 32 &&
show_bits(&s->gb, 8) == 0xFF) {
GetBitContext bak = s->gb;
align_get_bits(&bak);
if (show_bits(&bak, 16) == 0xFFD1) {
av_dlog(s->avctx, "AVRn interlaced picture marker found\n");
s->gb = bak;
skip_bits(&s->gb, 16);
s->bottom_field ^= 1;
goto next_field;
}
}
emms_c();
return 0;
out_of_range:
av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
return AVERROR_INVALIDDATA;
}
static int mjpeg_decode_dri(MJpegDecodeContext *s)
{
if (get_bits(&s->gb, 16) != 4)
return AVERROR_INVALIDDATA;
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 AVERROR_INVALIDDATA;
if (8 * len > get_bits_left(&s->gb))
return AVERROR_INVALIDDATA;
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
information, but it's always present in AVID-created 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;
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
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;
/* Apple MJPEG-A */
if (id == AV_RL32("mjpg")) {
#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_left(&s->gb)) {
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;
} 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;
}
/* 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_find_marker(MJpegDecodeContext *s,
const uint8_t **buf_ptr, const uint8_t *buf_end,
const uint8_t **unescaped_buf_ptr,
int *unescaped_buf_size)
{
int start_code;
start_code = find_marker(buf_ptr, buf_end);
av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
if (!s->buffer)
return AVERROR(ENOMEM);
/* 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 (s->avctx->codec_id != AV_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;
}
}
}
*unescaped_buf_ptr = s->buffer;
*unescaped_buf_size = dst - s->buffer;
memset(s->buffer + *unescaped_buf_size, 0,
FF_INPUT_BUFFER_PADDING_SIZE);
av_log(s->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);
*unescaped_buf_ptr = dst;
*unescaped_buf_size = (bit_count + 7) >> 3;
memset(s->buffer + *unescaped_buf_size, 0,
FF_INPUT_BUFFER_PADDING_SIZE);
} else {
*unescaped_buf_ptr = *buf_ptr;
*unescaped_buf_size = buf_end - *buf_ptr;
}
return start_code;
}
int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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;
const uint8_t *unescaped_buf_ptr;
int unescaped_buf_size;
int start_code;
int ret = 0;
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 = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
&unescaped_buf_ptr,
&unescaped_buf_size);
/* EOF */
if (start_code < 0) {
goto the_end;
} else if (unescaped_buf_size > INT_MAX / 8) {
av_log(avctx, AV_LOG_ERROR,
"MJPEG packet 0x%x too big (%d/%d), corrupt data?\n",
start_code, unescaped_buf_size, buf_size);
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
start_code, buf_end - buf_ptr);
ret = init_get_bits(&s->gb, unescaped_buf_ptr,
unescaped_buf_size * 8);
if (ret < 0)
return ret;
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);
if (!CONFIG_JPEGLS_DECODER &&
(start_code == SOF48 || start_code == LSE)) {
av_log(avctx, AV_LOG_ERROR, "JPEG-LS support not enabled.\n");
return AVERROR(ENOSYS);
}
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 ((ret = ff_mjpeg_decode_dht(s)) < 0) {
av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
return ret;
}
break;
case SOF0:
case SOF1:
s->lossless = 0;
s->ls = 0;
s->progressive = 0;
if ((ret = ff_mjpeg_decode_sof(s)) < 0)
return ret;
break;
case SOF2:
s->lossless = 0;
s->ls = 0;
s->progressive = 1;
if ((ret = ff_mjpeg_decode_sof(s)) < 0)
return ret;
break;
case SOF3:
s->lossless = 1;
s->ls = 0;
s->progressive = 0;
if ((ret = ff_mjpeg_decode_sof(s)) < 0)
return ret;
break;
case SOF48:
s->lossless = 1;
s->ls = 1;
s->progressive = 0;
if ((ret = ff_mjpeg_decode_sof(s)) < 0)
return ret;
break;
case LSE:
if (!CONFIG_JPEGLS_DECODER ||
(ret = ff_jpegls_decode_lse(s)) < 0)
return ret;
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;
}
if ((ret = av_frame_ref(data, s->picture_ptr)) < 0)
return ret;
*got_frame = 1;
if (!s->lossless &&
avctx->debug & FF_DEBUG_QP) {
av_log(avctx, AV_LOG_DEBUG,
"QP: %d\n", FFMAX3(s->qscale[0],
s->qscale[1],
s->qscale[2]));
}
goto the_end;
case SOS:
if (!s->got_picture) {
av_log(avctx, AV_LOG_WARNING,
"Can not process SOS before SOF, skipping\n");
break;
}
if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 &&
(avctx->err_recognition & AV_EF_EXPLODE))
return ret;
/* 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;
}
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 AVERROR_INVALIDDATA;
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_ptr)
av_frame_unref(s->picture_ptr);
av_free(s->buffer);
av_freep(&s->ljpeg_buffer);
s->ljpeg_buffer_size = 0;
for (i = 0; i < 3; i++) {
for (j = 0; j < 4; j++)
ff_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;
}
#define OFFSET(x) offsetof(MJpegDecodeContext, x)
#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "extern_huff", "Use external huffman table.",
OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
{ NULL },
};
static const AVClass mjpegdec_class = {
.class_name = "MJPEG decoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_mjpeg_decoder = {
.name = "mjpeg",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MJPEG,
.priv_data_size = sizeof(MJpegDecodeContext),
.init = ff_mjpeg_decode_init,
.close = ff_mjpeg_decode_end,
.decode = ff_mjpeg_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
.priv_class = &mjpegdec_class,
};
AVCodec ff_thp_decoder = {
.name = "thp",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_THP,
.priv_data_size = sizeof(MJpegDecodeContext),
.init = ff_mjpeg_decode_init,
.close = ff_mjpeg_decode_end,
.decode = ff_mjpeg_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
};
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