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h264decoder: Update output frame duration when second field frame is discarded

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In case of an interlaced stream, if each field picture belongs to
different GstVideoCodecFrame, updates output frame's duration
based on discarded second field picture's timestamp information.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7132>
This commit is contained in:
Seungha Yang 2024-07-03 22:57:58 +09:00 committed by GStreamer Marge Bot
parent 2a6967a8cd
commit 89096dde38
1 changed files with 38 additions and 2 deletions
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40
subprojects/gst-plugins-bad/gst-libs/gst/codecs/gsth264decoder.c
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@ -2180,10 +2180,46 @@ gst_h264_decoder_finish_picture (GstH264Decoder * self,
if (picture->second_field && picture->other_field &&
GST_CODEC_PICTURE_FRAME_NUMBER (picture) !=
GST_CODEC_PICTURE_FRAME_NUMBER (picture->other_field)) {
GstVideoCodecFrame *frame = gst_video_decoder_get_frame (decoder,
GstVideoCodecFrame *second_field = gst_video_decoder_get_frame (decoder,
GST_CODEC_PICTURE_FRAME_NUMBER (picture));
GstVideoCodecFrame *first_field = gst_video_decoder_get_frame (decoder,
GST_CODEC_PICTURE_FRAME_NUMBER (picture->other_field));
gst_video_decoder_release_frame (decoder, frame);
/* Update frame duration. since we output a frame for two input field
* pictures, output buffer duration should be first-field-duration +
* second-field-duration */
if (first_field) {
if (GST_CLOCK_TIME_IS_VALID (first_field->pts) &&
GST_CLOCK_TIME_IS_VALID (second_field->pts)) {
GstClockTime first_field_end_time = first_field->pts;
GstClockTime frame_end_time = second_field->pts;
GstClockTime frame_duration;
if (GST_CLOCK_TIME_IS_VALID (first_field->duration))
first_field_end_time += first_field->duration;
if (GST_CLOCK_TIME_IS_VALID (second_field->duration))
frame_end_time += second_field->duration;
frame_end_time = MAX (first_field_end_time, frame_end_time);
if (frame_end_time >= first_field->pts) {
frame_duration = frame_end_time - first_field->pts;
GST_LOG_OBJECT (self, "Updating frame duration %"
GST_TIME_FORMAT " -> %" GST_TIME_FORMAT,
GST_TIME_ARGS (first_field->duration),
GST_TIME_ARGS (frame_duration));
first_field->duration = frame_duration;
}
}
gst_video_codec_frame_unref (first_field);
} else {
GST_ERROR_OBJECT (self, "Couldn't get first field codec frame %u",
GST_CODEC_PICTURE_FRAME_NUMBER (picture->other_field));
}
gst_video_decoder_release_frame (decoder, second_field);
}
/* C.4.4 */