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fixing h263 decoding (did segfault) 

Originally committed as revision 1049 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-10-19 01:31:26 +00:00
parent fb8a9e2f37
commit 8b32880cc9
2 changed files with 32 additions and 28 deletions
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5
libavcodec/h263dec.c
View File

@ -475,13 +475,14 @@ uint64_t time= rdtsc();
break;
}
if(s->msmpeg4_version!=4)
if(s->msmpeg4_version!=4 && s->h263_pred)
ff_mpeg4_clean_buffers(s);
decode_slice(s);
s->error_status_table[s->resync_mb_x + s->resync_mb_y*s->mb_width]|= VP_START;
}
if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE)
if(msmpeg4_decode_ext_header(s, buf_size) < 0) return -1;

55
libavcodec/mpegvideo.c
View File

@ -225,8 +225,8 @@ int DCT_common_init(MpegEncContext *s)
/* init common structure for both encoder and decoder */
int MPV_common_init(MpegEncContext *s)
{
int c_size, i;
UINT8 *pict;
int y_size, c_size, yc_size, i;
DCT_common_init(s);
@ -235,6 +235,10 @@ int MPV_common_init(MpegEncContext *s)
s->mb_width = (s->width + 15) / 16;
s->mb_height = (s->height + 15) / 16;
y_size = (2 * s->mb_width + 2) * (2 * s->mb_height + 2);
c_size = (s->mb_width + 2) * (s->mb_height + 2);
yc_size = y_size + 2 * c_size;
/* set default edge pos, will be overriden in decode_header if needed */
s->h_edge_pos= s->mb_width*16;
s->v_edge_pos= s->mb_height*16;
@ -246,36 +250,37 @@ int MPV_common_init(MpegEncContext *s)
+ (toupper((s->avctx->fourcc>>24)&0xFF)<<24);
s->mb_num = s->mb_width * s->mb_height;
if(!(s->flags&CODEC_FLAG_DR1)){
s->linesize = s->mb_width * 16 + 2 * EDGE_WIDTH;
s->uvlinesize = s->mb_width * 8 + EDGE_WIDTH;
for(i=0;i<3;i++) {
int w, h, shift, pict_start;
int w, h, shift, pict_start, size;
w = s->linesize;
h = s->mb_height * 16 + 2 * EDGE_WIDTH;
shift = (i == 0) ? 0 : 1;
c_size = (s->linesize>>shift) * (h >> shift);
size = (s->linesize>>shift) * (h >> shift);
pict_start = (s->linesize>>shift) * (EDGE_WIDTH >> shift) + (EDGE_WIDTH >> shift);
CHECKED_ALLOCZ(pict, c_size)
CHECKED_ALLOCZ(pict, size)
s->last_picture_base[i] = pict;
s->last_picture[i] = pict + pict_start;
if(i>0) memset(s->last_picture_base[i], 128, c_size);
if(i>0) memset(s->last_picture_base[i], 128, size);
CHECKED_ALLOCZ(pict, c_size)
CHECKED_ALLOCZ(pict, size)
s->next_picture_base[i] = pict;
s->next_picture[i] = pict + pict_start;
if(i>0) memset(s->next_picture_base[i], 128, c_size);
if(i>0) memset(s->next_picture_base[i], 128, size);
if (s->has_b_frames || s->codec_id==CODEC_ID_MPEG4) {
/* Note the MPEG4 stuff is here cuz of buggy encoders which dont set the low_delay flag but
do low-delay encoding, so we cant allways distinguish b-frame containing streams from low_delay streams */
CHECKED_ALLOCZ(pict, c_size)
CHECKED_ALLOCZ(pict, size)
s->aux_picture_base[i] = pict;
s->aux_picture[i] = pict + pict_start;
if(i>0) memset(s->aux_picture_base[i], 128, c_size);
if(i>0) memset(s->aux_picture_base[i], 128, size);
}
}
s->ip_buffer_count= 2;
@ -310,14 +315,14 @@ int MPV_common_init(MpegEncContext *s)
for(j=0; j<REORDER_BUFFER_SIZE; j++){
int i;
for(i=0;i<3;i++) {
int w, h, shift;
int w, h, shift, size;
w = s->linesize;
h = s->mb_height * 16;
shift = (i == 0) ? 0 : 1;
c_size = (w >> shift) * (h >> shift);
size = (w >> shift) * (h >> shift);
CHECKED_ALLOCZ(pict, c_size);
CHECKED_ALLOCZ(pict, size);
s->picture_buffer[j][i] = pict;
}
}
@ -356,21 +361,8 @@ int MPV_common_init(MpegEncContext *s)
CHECKED_ALLOCZ(s->co_located_type_table, s->mb_num * sizeof(UINT8))
if (s->h263_pred || s->h263_plus) {
int y_size, c_size, i, size;
/* dc values */
y_size = (2 * s->mb_width + 2) * (2 * s->mb_height + 2);
c_size = (s->mb_width + 2) * (s->mb_height + 2);
size = y_size + 2 * c_size;
CHECKED_ALLOCZ(s->dc_val[0], size * sizeof(INT16));
s->dc_val[1] = s->dc_val[0] + y_size;
s->dc_val[2] = s->dc_val[1] + c_size;
for(i=0;i<size;i++)
s->dc_val[0][i] = 1024;
/* ac values */
CHECKED_ALLOCZ(s->ac_val[0], size * sizeof(INT16) * 16);
CHECKED_ALLOCZ(s->ac_val[0], yc_size * sizeof(INT16) * 16);
s->ac_val[1] = s->ac_val[0] + y_size;
s->ac_val[2] = s->ac_val[1] + c_size;
@ -384,6 +376,17 @@ int MPV_common_init(MpegEncContext *s)
CHECKED_ALLOCZ(s->cbp_table , s->mb_num * sizeof(UINT8))
CHECKED_ALLOCZ(s->pred_dir_table, s->mb_num * sizeof(UINT8))
}
if (s->h263_pred || s->h263_plus || !s->encoding) {
/* dc values */
//MN: we need these for error resilience of intra-frames
CHECKED_ALLOCZ(s->dc_val[0], yc_size * sizeof(INT16));
s->dc_val[1] = s->dc_val[0] + y_size;
s->dc_val[2] = s->dc_val[1] + c_size;
for(i=0;i<yc_size;i++)
s->dc_val[0][i] = 1024;
}
CHECKED_ALLOCZ(s->qscale_table , s->mb_num * sizeof(UINT8))
/* which mb is a intra block */