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Diffstat (limited to 'libavcodec/mpeg4videodec.c')
-rw-r--r--libavcodec/mpeg4videodec.c237
1 files changed, 164 insertions, 73 deletions
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index ebc74a74b6..8bdc29363e 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -3,23 +3,26 @@
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#define UNCHECKED_BITSTREAM_READER 1
+
+#include "libavutil/opt.h"
#include "mpegvideo.h"
#include "mpeg4video.h"
#include "h263.h"
@@ -113,7 +116,7 @@ static inline int mpeg4_is_resync(MpegEncContext *s){
int bits_count= get_bits_count(&s->gb);
int v= show_bits(&s->gb, 16);
- if(s->workaround_bugs&FF_BUG_NO_PADDING){
+ if(s->workaround_bugs&FF_BUG_NO_PADDING && !s->resync_marker){
return 0;
}
@@ -130,10 +133,11 @@ static inline int mpeg4_is_resync(MpegEncContext *s){
v|= 0x7F >> (7-(bits_count&7));
if(v==0x7F)
- return 1;
+ return s->mb_num;
}else{
if(v == ff_mpeg4_resync_prefix[bits_count&7]){
- int len;
+ int len, mb_num;
+ int mb_num_bits= av_log2(s->mb_num - 1) + 1;
GetBitContext gb= s->gb;
skip_bits(&s->gb, 1);
@@ -143,16 +147,20 @@ static inline int mpeg4_is_resync(MpegEncContext *s){
if(get_bits1(&s->gb)) break;
}
+ mb_num= get_bits(&s->gb, mb_num_bits);
+ if(!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
+ mb_num= -1;
+
s->gb= gb;
if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
- return 1;
+ return mb_num;
}
}
return 0;
}
-static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
+static int mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
{
int i;
int a= 2<<s->sprite_warping_accuracy;
@@ -168,6 +176,9 @@ static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb
int h= s->height;
int min_ab;
+ if(w<=0 || h<=0)
+ return -1;
+
for(i=0; i<s->num_sprite_warping_points; i++){
int length;
int x=0, y=0;
@@ -340,6 +351,7 @@ static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb
}
s->real_sprite_warping_points= s->num_sprite_warping_points;
}
+ return 0;
}
/**
@@ -373,17 +385,6 @@ int ff_mpeg4_decode_video_packet_header(MpegEncContext *s)
av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
return -1;
}
- if(s->pict_type == AV_PICTURE_TYPE_B){
- int mb_x = 0, mb_y = 0;
-
- while (s->next_picture.f.mbskip_table[s->mb_index2xy[mb_num]]) {
- if (!mb_x)
- ff_thread_await_progress(&s->next_picture_ptr->f, mb_y++, 0);
- mb_num++;
- if (++mb_x == s->mb_width) mb_x = 0;
- }
- if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
- }
s->mb_x= mb_num % s->mb_width;
s->mb_y= mb_num / s->mb_width;
@@ -414,7 +415,8 @@ int ff_mpeg4_decode_video_packet_header(MpegEncContext *s)
skip_bits(&s->gb, 3); /* intra dc vlc threshold */
//FIXME don't just ignore everything
if(s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
- mpeg4_decode_sprite_trajectory(s, &s->gb);
+ if(mpeg4_decode_sprite_trajectory(s, &s->gb) < 0)
+ return -1;
av_log(s->avctx, AV_LOG_ERROR, "untested\n");
}
@@ -521,7 +523,7 @@ static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
if (code > 8){
if(get_bits1(&s->gb)==0){ /* marker */
- if(s->err_recognition&AV_EF_BITSTREAM){
+ if(s->err_recognition&(AV_EF_BITSTREAM|AV_EF_COMPLIANT)){
av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
return -1;
}
@@ -845,7 +847,7 @@ static inline int mpeg4_decode_block(MpegEncContext * s, int16_t * block,
int n, int coded, int intra, int rvlc)
{
int level, i, last, run;
- int dc_pred_dir;
+ int av_uninit(dc_pred_dir);
RLTable * rl;
RL_VLC_ELEM * rl_vlc;
const uint8_t * scan_table;
@@ -991,11 +993,33 @@ static inline int mpeg4_decode_block(MpegEncContext * s, int16_t * block,
SKIP_COUNTER(re, &s->gb, 1+12+1);
}
+#if 0
+ if(s->error_recognition >= FF_ER_COMPLIANT){
+ const int abs_level= FFABS(level);
+ if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
+ const int run1= run - rl->max_run[last][abs_level] - 1;
+ if(abs_level <= rl->max_level[last][run]){
+ av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
+ return -1;
+ }
+ if(s->error_recognition > FF_ER_COMPLIANT){
+ if(abs_level <= rl->max_level[last][run]*2){
+ av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
+ return -1;
+ }
+ if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
+ av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
+ return -1;
+ }
+ }
+ }
+ }
+#endif
if (level>0) level= level * qmul + qadd;
else level= level * qmul - qadd;
if((unsigned)(level + 2048) > 4095){
- if(s->err_recognition & AV_EF_BITSTREAM){
+ if(s->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)){
if(level > 2560 || level<-2560){
av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
return -1;
@@ -1155,7 +1179,7 @@ static int mpeg4_decode_mb(MpegEncContext *s,
static int8_t quant_tab[4] = { -1, -2, 1, 2 };
const int xy= s->mb_x + s->mb_y * s->mb_stride;
- assert(s->h263_pred);
+ av_assert2(s->h263_pred);
if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
do{
@@ -1467,16 +1491,21 @@ end:
/* per-MB end of slice check */
if(s->codec_id==AV_CODEC_ID_MPEG4){
- if(mpeg4_is_resync(s)){
- const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
+ int next= mpeg4_is_resync(s);
+ if(next) {
+ if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
+ return -1;
+ } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
+ return SLICE_END;
- if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.f.mbskip_table[xy + delta]) {
+ if(s->pict_type==AV_PICTURE_TYPE_B){
+ const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
ff_thread_await_progress(&s->next_picture_ptr->f,
(s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y+1, s->mb_height-1) : s->mb_y, 0);
+ if (s->next_picture.f.mbskip_table[xy + delta])
+ return SLICE_OK;
}
- if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.f.mbskip_table[xy + delta])
- return SLICE_OK;
return SLICE_END;
}
}
@@ -1487,35 +1516,36 @@ end:
static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
int hours, minutes, seconds;
- unsigned time_code = show_bits(gb, 18);
-
- if (time_code & 0x40) { /* marker_bit */
- hours = time_code >> 13;
- minutes = time_code >> 7 & 0x3f;
- seconds = time_code & 0x3f;
- s->time_base = seconds + 60*(minutes + 60*hours);
- skip_bits(gb, 20); /* time_code, closed_gov, broken_link */
- } else {
- av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n");
+
+ if(!show_bits(gb, 23)){
+ av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
+ return -1;
}
+ hours= get_bits(gb, 5);
+ minutes= get_bits(gb, 6);
+ skip_bits1(gb);
+ seconds= get_bits(gb, 6);
+
+ s->time_base= seconds + 60*(minutes + 60*hours);
+
+ skip_bits1(gb);
+ skip_bits1(gb);
+
return 0;
}
static int mpeg4_decode_profile_level(MpegEncContext * s, GetBitContext *gb){
- int profile_and_level_indication;
- profile_and_level_indication = get_bits(gb, 8);
+ s->avctx->profile = get_bits(gb, 4);
+ s->avctx->level = get_bits(gb, 4);
- s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4;
- s->avctx->level = (profile_and_level_indication & 0x0f);
-
- // for Simple profile, level 0
- if (s->avctx->profile == 0 && s->avctx->level == 8) {
- s->avctx->level = 0;
- }
+ // for Simple profile, level 0
+ if (s->avctx->profile == 0 && s->avctx->level == 8) {
+ s->avctx->level = 0;
+ }
- return 0;
+ return 0;
}
static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
@@ -1558,7 +1588,7 @@ static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
skip_bits1(gb); /* marker */
}
}else{
- // set low delay flag only once the smartest? low delay detection won't be overriden
+ // set low delay flag only once the smartest? low delay detection won't be overridden
if(s->picture_number==0)
s->low_delay=0;
}
@@ -1647,6 +1677,9 @@ static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
s->quant_precision = get_bits(gb, 4); /* quant_precision */
if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
+ if(s->quant_precision<3 || s->quant_precision>9) {
+ s->quant_precision = 5;
+ }
} else {
s->quant_precision = 5;
}
@@ -1824,6 +1857,18 @@ no_cplx_est:
// bin shape stuff FIXME
}
}
+
+ if(s->avctx->debug&FF_DEBUG_PICT_INFO) {
+ av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
+ s->avctx->time_base.num, s->avctx->time_base.den,
+ s->time_increment_bits,
+ s->quant_precision,
+ s->progressive_sequence,
+ s->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
+ s->data_partitioning ? "partition " : "", s->rvlc ? "rvlc " : ""
+ );
+ }
+
return 0;
}
@@ -1918,6 +1963,9 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
}
av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
+ if (s->avctx->time_base.den && 4*s->avctx->time_base.den < 1<<s->time_increment_bits) {
+ s->avctx->time_base.den = 1<<s->time_increment_bits;
+ }
}
if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
@@ -1959,7 +2007,7 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
}
if(s->avctx->time_base.num)
- s->current_picture_ptr->f.pts = (s->time + s->avctx->time_base.num / 2) / s->avctx->time_base.num;
+ s->current_picture_ptr->f.pts = ROUNDED_DIV(s->time, s->avctx->time_base.num);
else
s->current_picture_ptr->f.pts = AV_NOPTS_VALUE;
if(s->avctx->debug&FF_DEBUG_PTS)
@@ -2008,6 +2056,10 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
if(s->pict_type == AV_PICTURE_TYPE_B)
skip_bits_long(gb, s->cplx_estimation_trash_b);
+ if(get_bits_left(gb) < 3) {
+ av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
+ return -1;
+ }
s->intra_dc_threshold= ff_mpeg4_dc_threshold[ get_bits(gb, 3) ];
if(!s->progressive_sequence){
s->top_field_first= get_bits1(gb);
@@ -2029,7 +2081,8 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
}
if(s->pict_type == AV_PICTURE_TYPE_S && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
- mpeg4_decode_sprite_trajectory(s, gb);
+ if(mpeg4_decode_sprite_trajectory(s, gb) < 0)
+ return -1;
if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
}
@@ -2045,6 +2098,7 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
s->f_code = get_bits(gb, 3); /* fcode_for */
if(s->f_code==0){
av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
+ s->f_code=1;
return -1; // makes no sense to continue, as the MV decoding will break very quickly
}
}else
@@ -2052,16 +2106,25 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
if (s->pict_type == AV_PICTURE_TYPE_B) {
s->b_code = get_bits(gb, 3);
+ if(s->b_code==0){
+ av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (b_code=0)\n");
+ s->b_code=1;
+ return -1; // makes no sense to continue, as the MV decoding will break very quickly
+ }
}else
s->b_code=1;
if(s->avctx->debug&FF_DEBUG_PICT_INFO){
- av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n",
+ av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d time:%"PRId64" tincr:%d\n",
s->qscale, s->f_code, s->b_code,
s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
- s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold, s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b);
+ s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold,
+ s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b,
+ s->time,
+ time_increment
+ );
}
if(!s->scalability){
@@ -2119,8 +2182,8 @@ int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
startcode = 0xff;
for(;;) {
if(get_bits_count(gb) >= gb->size_in_bits){
- if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){
- av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
+ if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0) || s->codec_tag == AV_RL32("QMP4")){
+ av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
return FRAME_SKIPPED; //divx bug
}else
return -1; //end of stream
@@ -2192,23 +2255,10 @@ end:
return decode_vop_header(s, gb);
}
-static av_cold int decode_init(AVCodecContext *avctx)
-{
- MpegEncContext *s = avctx->priv_data;
- int ret;
+av_cold void ff_mpeg4videodec_static_init(void) {
static int done = 0;
- s->divx_version=
- s->divx_build=
- s->xvid_build=
- s->lavc_build= -1;
-
- if((ret=ff_h263_decode_init(avctx)) < 0)
- return ret;
-
if (!done) {
- done = 1;
-
ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
@@ -2227,10 +2277,27 @@ static av_cold int decode_init(AVCodecContext *avctx)
INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
&ff_mb_type_b_tab[0][1], 2, 1,
&ff_mb_type_b_tab[0][0], 2, 1, 16);
+ done = 1;
}
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+ MpegEncContext *s = avctx->priv_data;
+ int ret;
+
+ s->divx_version=
+ s->divx_build=
+ s->xvid_build=
+ s->lavc_build= -1;
+
+ if((ret=ff_h263_decode_init(avctx)) < 0)
+ return ret;
+
+ ff_mpeg4videodec_static_init();
s->h263_pred = 1;
- s->low_delay = 0; //default, might be overriden in the vol header during header parsing
+ s->low_delay = 0; //default, might be overridden in the vol header during header parsing
s->decode_mb= mpeg4_decode_mb;
s->time_increment_bits = 4; /* default value for broken headers */
avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
@@ -2255,6 +2322,27 @@ static const AVProfile mpeg4_video_profiles[] = {
{ FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
{ FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
{ FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
+ { FF_PROFILE_UNKNOWN },
+};
+
+static const AVOption mpeg4_options[] = {
+ {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
+ {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
+ {NULL}
+};
+
+static const AVClass mpeg4_class = {
+ "MPEG4 Video Decoder",
+ av_default_item_name,
+ mpeg4_options,
+ LIBAVUTIL_VERSION_INT,
+};
+
+static const AVClass mpeg4_vdpau_class = {
+ "MPEG4 Video VDPAU Decoder",
+ av_default_item_name,
+ mpeg4_options,
+ LIBAVUTIL_VERSION_INT,
};
AVCodec ff_mpeg4_decoder = {
@@ -2269,10 +2357,12 @@ AVCodec ff_mpeg4_decoder = {
CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
CODEC_CAP_FRAME_THREADS,
.flush = ff_mpeg_flush,
+ .max_lowres = 3,
.long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
- .pix_fmts = ff_hwaccel_pixfmt_list_420,
+ .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
.profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
.update_thread_context = ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context),
+ .priv_class = &mpeg4_class,
};
@@ -2290,5 +2380,6 @@ AVCodec ff_mpeg4_vdpau_decoder = {
.long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_VDPAU_MPEG4,
AV_PIX_FMT_NONE },
+ .priv_class = &mpeg4_vdpau_class,
};
#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 08:03:16 +0000