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avviddec: Report a latency even without upstream framerate

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There are cases where upstream will not provide a framerate, or it won't be
fixed. But if there is latency introduced by the decoder we do want to report
it.

Therefore use the framerate stored in the actual decoder, which will have a
default.

Fixes hangs when playing back such streams with decodebin3 (where the multiqueue
will not have been informed of that downstream latency and not grow accordingly)

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3391>
This commit is contained in:
Edward Hervey 2022-11-11 09:06:55 +01:00 committed by GStreamer Marge Bot
parent d77fe9495a
commit c39400b52c
1 changed files with 20 additions and 10 deletions
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30
subprojects/gst-libav/ext/libav/gstavviddec.c
View file

@ -666,16 +666,20 @@ update_state:
gst_video_codec_state_unref (ffmpegdec->input_state);
ffmpegdec->input_state = gst_video_codec_state_ref (state);
if (ffmpegdec->input_state->info.fps_n) {
GstVideoInfo *info = &ffmpegdec->input_state->info;
/* Use the framerate values stored in the decoder for calculating latency. The
* upstream framerate might not be set but we still want to report a latency
* if needed. */
if (ffmpegdec->context->time_base.den && ffmpegdec->context->ticks_per_frame) {
gint fps_n =
ffmpegdec->context->time_base.den / ffmpegdec->context->ticks_per_frame;
gint fps_d = ffmpegdec->context->time_base.num;
latency = gst_util_uint64_scale_ceil (
(ffmpegdec->context->has_b_frames) * GST_SECOND, info->fps_d,
info->fps_n);
(ffmpegdec->context->has_b_frames) * GST_SECOND, fps_d, fps_n);
if (ffmpegdec->context->thread_type & FF_THREAD_FRAME) {
latency +=
gst_util_uint64_scale_ceil (ffmpegdec->context->thread_count *
GST_SECOND, info->fps_d, info->fps_n);
GST_SECOND, fps_d, fps_n);
}
}
@ -1453,8 +1457,7 @@ gst_ffmpegviddec_negotiate (GstFFMpegVidDec * ffmpegdec,
}
/* try to find a good framerate */
if ((in_info->fps_d && in_info->fps_n) ||
GST_VIDEO_INFO_FLAG_IS_SET (in_info, GST_VIDEO_FLAG_VARIABLE_FPS)) {
if ((in_info->fps_d && in_info->fps_n)) {
/* take framerate from input when it was specified (#313970) */
fps_n = in_info->fps_n;
fps_d = in_info->fps_d;
@ -1475,9 +1478,16 @@ gst_ffmpegviddec_negotiate (GstFFMpegVidDec * ffmpegdec,
}
}
GST_LOG_OBJECT (ffmpegdec, "setting framerate: %d/%d", fps_n, fps_d);
out_info->fps_n = fps_n;
out_info->fps_d = fps_d;
if (GST_VIDEO_INFO_FLAG_IS_SET (in_info, GST_VIDEO_FLAG_VARIABLE_FPS)) {
GST_LOG_OBJECT (ffmpegdec, "setting framerate: %d/%d", in_info->fps_n,
in_info->fps_d);
out_info->fps_n = in_info->fps_n;
out_info->fps_d = in_info->fps_d;
} else {
GST_LOG_OBJECT (ffmpegdec, "setting framerate: %d/%d", fps_n, fps_d);
out_info->fps_n = fps_n;
out_info->fps_d = fps_d;
}
/* calculate and update par now */
gst_ffmpegviddec_update_par (ffmpegdec, in_info, out_info);