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Code Issues Releases Activity

rtpdec_vp8: Request a keyframe if RTP packets are lost

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Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-12-11 16:03:33 +02:00
parent 86d9181cf4
commit 6f72441120
1 changed files with 27 additions and 1 deletions
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28
libavformat/rtpdec_vp8.c
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@ -35,11 +35,21 @@ struct PayloadContext {
AVIOContext *data;
uint32_t timestamp;
int is_keyframe;
/* If sequence_ok is set, we keep returning data (even if we might have
* lost some data, but we haven't lost any too critical data that would
* cause the decoder to desynchronize and output random garbage).
*/
int sequence_ok;
int first_part_size;
uint16_t prev_seq;
int prev_pictureid;
int broken_frame;
/* If sequence_dirty is set, we have lost some data (critical or
* non-critical) and decoding will have some sort of artefacts, and
* we thus should request a new keyframe.
*/
int sequence_dirty;
int got_keyframe;
};
static void vp8_free_buffer(PayloadContext *vp8)
@ -141,11 +151,15 @@ static int vp8_handle_packet(AVFormatContext *ctx, PayloadContext *vp8,
vp8_free_buffer(vp8);
// Keyframe, decoding ok again
vp8->sequence_ok = 1;
vp8->sequence_dirty = 0;
vp8->got_keyframe = 1;
} else {
int can_continue = vp8->data && !vp8->is_keyframe &&
avio_tell(vp8->data) >= vp8->first_part_size;
if (!vp8->sequence_ok)
return AVERROR(EAGAIN);
if (!vp8->got_keyframe)
return vp8_broken_sequence(ctx, vp8, "Keyframe missing\n");
if (pictureid >= 0) {
if (pictureid != ((vp8->prev_pictureid + 1) & pictureid_mask)) {
return vp8_broken_sequence(ctx, vp8,
@ -179,6 +193,7 @@ static int vp8_handle_packet(AVFormatContext *ctx, PayloadContext *vp8,
}
}
if (vp8->data) {
vp8->sequence_dirty = 1;
if (avio_tell(vp8->data) >= vp8->first_part_size) {
int ret = ff_rtp_finalize_packet(pkt, &vp8->data, st->index);
if (ret < 0)
@ -220,6 +235,7 @@ static int vp8_handle_packet(AVFormatContext *ctx, PayloadContext *vp8,
"Missed part of a keyframe, sequence broken\n");
} else if (vp8->data && avio_tell(vp8->data) >= vp8->first_part_size) {
vp8->broken_frame = 1;
vp8->sequence_dirty = 1;
} else {
return vp8_broken_sequence(ctx, vp8,
"Missed part of the first partition, sequence broken\n");
@ -253,7 +269,11 @@ static int vp8_handle_packet(AVFormatContext *ctx, PayloadContext *vp8,
static PayloadContext *vp8_new_context(void)
{
return av_mallocz(sizeof(PayloadContext));
PayloadContext *vp8 = av_mallocz(sizeof(PayloadContext));
if (!vp8)
return NULL;
vp8->sequence_ok = 1;
return vp8;
}
static void vp8_free_context(PayloadContext *vp8)
@ -262,6 +282,11 @@ static void vp8_free_context(PayloadContext *vp8)
av_free(vp8);
}
static int vp8_need_keyframe(PayloadContext *vp8)
{
return vp8->sequence_dirty || !vp8->sequence_ok;
}
RTPDynamicProtocolHandler ff_vp8_dynamic_handler = {
.enc_name = "VP8",
.codec_type = AVMEDIA_TYPE_VIDEO,
@ -269,4 +294,5 @@ RTPDynamicProtocolHandler ff_vp8_dynamic_handler = {
.alloc = vp8_new_context,
.free = vp8_free_context,
.parse_packet = vp8_handle_packet,
.need_keyframe = vp8_need_keyframe,
};