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Code Issues Releases Activity

avcodec/h261dec: Export key frame information

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Implements ticket #8343.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-04-09 14:23:32 +02:00
parent 6a202c3431
commit 88d8150de7
1 changed files with 9 additions and 7 deletions
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16
libavcodec/h261dec.c
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@ -25,7 +25,6 @@
* H.261 decoder.
*/
#include "libavutil/avassert.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "codec_internal.h"
@ -458,7 +457,7 @@ intra:
* Decode the H.261 picture header.
* @return <0 if no startcode found
*/
static int h261_decode_picture_header(H261DecContext *h)
static int h261_decode_picture_header(H261DecContext *h, int *is_key)
{
MpegEncContext *const s = &h->s;
int format, i;
@ -482,7 +481,7 @@ static int h261_decode_picture_header(H261DecContext *h)
/* PTYPE starts here */
skip_bits1(&s->gb); /* split screen off */
skip_bits1(&s->gb); /* camera off */
skip_bits1(&s->gb); /* freeze picture release off */
*is_key = get_bits1(&s->gb); /* freeze picture release off */
format = get_bits1(&s->gb);
@ -545,7 +544,7 @@ static int h261_decode_frame(AVCodecContext *avctx, AVFrame *pict,
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MpegEncContext *s = &h->s;
int ret;
int ret, is_key;
ff_dlog(avctx, "*****frame %"PRId64" size=%d\n", avctx->frame_num, buf_size);
ff_dlog(avctx, "bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
@ -554,7 +553,7 @@ static int h261_decode_frame(AVCodecContext *avctx, AVFrame *pict,
init_get_bits(&s->gb, buf, buf_size * 8);
ret = h261_decode_picture_header(h);
ret = h261_decode_picture_header(h, &is_key);
/* skip if the header was thrashed */
if (ret < 0) {
@ -575,7 +574,7 @@ static int h261_decode_frame(AVCodecContext *avctx, AVFrame *pict,
return ret;
}
if ((avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I) ||
if ((avctx->skip_frame >= AVDISCARD_NONINTRA && !is_key) ||
avctx->skip_frame >= AVDISCARD_ALL)
return buf_size;
@ -595,7 +594,10 @@ static int h261_decode_frame(AVCodecContext *avctx, AVFrame *pict,
}
ff_mpv_frame_end(s);
av_assert0(s->pict_type == s->cur_pic.ptr->f->pict_type);
if (is_key) {
s->cur_pic.ptr->f->pict_type = AV_PICTURE_TYPE_I;
s->cur_pic.ptr->f->flags |= AV_FRAME_FLAG_KEY;
}
if ((ret = av_frame_ref(pict, s->cur_pic.ptr->f)) < 0)
return ret;