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vc1: Handle WVC1 interlaced stream

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Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Aneesh Dogra 2011-12-20 01:38:19 +05:30 committed by Martin Storsjö
parent 00aad121d8
commit 0a6aff6936
1 changed files with 15 additions and 10 deletions
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25
libavcodec/vc1dec.c
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@ -5425,8 +5425,8 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
MpegEncContext *s = &v->s;
AVFrame *pict = data;
uint8_t *buf2 = NULL;
uint8_t *buf_field2 = NULL;
const uint8_t *buf_start = buf;
uint8_t *tmp;
int mb_height, n_slices1;
struct {
uint8_t *buf;
@ -5492,9 +5492,6 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
slices[n_slices].mby_start = s->mb_height >> 1;
n_slices1 = n_slices - 1; // index of the last slice of the first field
n_slices++;
// not necessary, ad hoc until I find a way to handle WVC1i
buf_field2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
vc1_unescape_buffer(start + 4, size, buf_field2);
break;
}
case VC1_CODE_ENTRYPOINT: /* it should be before frame data */
@ -5522,14 +5519,26 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
}
} else if (v->interlace && ((buf[0] & 0xC0) == 0xC0)) { /* WVC1 interlaced stores both fields divided by marker */
const uint8_t *divider;
int buf_size3;
divider = find_next_marker(buf, buf + buf_size);
if ((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD) {
av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");
goto err;
} else { // found field marker, unescape second field
buf_field2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
vc1_unescape_buffer(divider + 4, buf + buf_size - divider - 4, buf_field2);
tmp = av_realloc(slices, sizeof(*slices) * (n_slices+1));
if (!tmp)
goto err;
slices = tmp;
slices[n_slices].buf = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!slices[n_slices].buf)
goto err;
buf_size3 = vc1_unescape_buffer(divider + 4, buf + buf_size - divider - 4, slices[n_slices].buf);
init_get_bits(&slices[n_slices].gb, slices[n_slices].buf,
buf_size3 << 3);
slices[n_slices].mby_start = s->mb_height >> 1;
n_slices1 = n_slices - 1;
n_slices++;
}
buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);
} else {
@ -5702,10 +5711,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
s->gb = slices[i].gb;
}
if (v->field_mode) {
av_free(buf_field2);
v->second_field = 0;
}
if (v->field_mode) {
if (s->pict_type == AV_PICTURE_TYPE_B) {
memcpy(v->mv_f_base, v->mv_f_next_base,
2 * (s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2));
@ -5760,7 +5766,6 @@ err:
for (i = 0; i < n_slices; i++)
av_free(slices[i].buf);
av_free(slices);
av_free(buf_field2);
return -1;
}