* 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"
};
/**
- * predicts the ac.
+ * Predict the ac.
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir the ac prediction direction
*/
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;
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;
}
s->real_sprite_warping_points= s->num_sprite_warping_points;
}
+ return 0;
}
/**
- * decodes the next video packet.
+ * Decode the next video packet.
* @return <0 if something went wrong
*/
int 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");
}
}
/**
- * gets the average motion vector for a GMC MB.
+ * Get the average motion vector for a GMC MB.
* @param n either 0 for the x component or 1 for y
* @return the average MV for a GMC MB
*/
}
/**
- * decodes the dc value.
+ * Decode the dc value.
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir_ptr the prediction direction will be stored here
* @return the quantized dc
if (code > 8){
if(get_bits1(&s->gb)==0){ /* marker */
- if(s->error_recognition>=2){
+ if(s->err_recognition&(AV_EF_BITSTREAM|AV_EF_COMPLIANT)){
av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
return -1;
}
}
/**
- * decodes first partition.
+ * Decode first partition.
* @return number of MBs decoded or <0 if an error occurred
*/
static int mpeg4_decode_partition_a(MpegEncContext *s){
}
/**
- * decodes the first & second partition
+ * Decode the first and second partition.
* @return <0 if error (and sets error type in the error_status_table)
*/
int ff_mpeg4_decode_partitions(MpegEncContext *s)
{
int mb_num;
- const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (DC_ERROR|MV_ERROR) : MV_ERROR;
- const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (DC_END |MV_END) : MV_END;
+ const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_ERROR|ER_MV_ERROR) : ER_MV_ERROR;
+ const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (ER_DC_END |ER_MV_END) : ER_MV_END;
mb_num= mpeg4_decode_partition_a(s);
if(mb_num<0){
if( mpeg4_decode_partition_b(s, mb_num) < 0){
if(s->pict_type==AV_PICTURE_TYPE_P)
- ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR);
+ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_DC_ERROR);
return -1;
}else{
if(s->pict_type==AV_PICTURE_TYPE_P)
- ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END);
+ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_DC_END);
}
return 0;
}
/**
- * decodes a block.
+ * Decode a block.
* @return <0 if an error occurred
*/
static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
}; SKIP_CACHE(re, &s->gb, 1);
last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
- run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
+ run= SHOW_UBITS(re, &s->gb, 6);
SKIP_COUNTER(re, &s->gb, 1+1+6);
UPDATE_CACHE(re, &s->gb);
}; SKIP_CACHE(re, &s->gb, 5);
level= level * qmul + qadd;
- level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1);
+ level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
SKIP_COUNTER(re, &s->gb, 1+11+5+1);
i+= run + 1;
/* third escape */
SKIP_CACHE(re, &s->gb, 2);
last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
- run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
+ run= SHOW_UBITS(re, &s->gb, 6);
SKIP_COUNTER(re, &s->gb, 2+1+6);
UPDATE_CACHE(re, &s->gb);
if(SHOW_UBITS(re, &s->gb, 1)==0){
av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
return -1;
- }; LAST_SKIP_CACHE(re, &s->gb, 1);
+ }
SKIP_COUNTER(re, &s->gb, 1+12+1);
}
else level= level * qmul - qadd;
if((unsigned)(level + 2048) > 4095){
- if(s->error_recognition > FF_ER_COMPLIANT){
+ 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;
}
/**
- * decodes the user data stuff in the header.
+ * Decode the user data stuff in the header.
* Also initializes divx/xvid/lavc_version/build.
*/
static int decode_user_data(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");
}
}
/**
- * decode mpeg4 headers
+ * Decode mpeg4 headers.
* @return <0 if no VOP found (or a damaged one)
* FRAME_SKIPPED if a not coded VOP is found
* 0 if a VOP is found
projects / ffmpeg / blobdiff