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avdec_h265: Fix endless renegoation with alternate interlacing

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The picture parameter picture->top_field_first is reused in this mode
to signal the TOP fields. As a side effect, it will change every frame
and current code assumed that if this changes then a renegotiation is
needed. Fixed this by ignoring that change whenever we are decoding one field
only.

Fixes #1523

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3276>
This commit is contained in:
Nicolas Dufresne 2022-10-26 16:30:31 -04:00 committed by GStreamer Marge Bot
parent 2408ca2f18
commit 5c2eba666b
1 changed files with 10 additions and 6 deletions
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16
subprojects/gst-libav/ext/libav/gstavviddec.c
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@ -98,7 +98,7 @@ static GstFlowReturn gst_ffmpegviddec_finish (GstVideoDecoder * decoder);
static GstFlowReturn gst_ffmpegviddec_drain (GstVideoDecoder * decoder);
static gboolean picture_changed (GstFFMpegVidDec * ffmpegdec,
AVFrame * picture);
AVFrame * picture, gboolean one_field);
static gboolean context_changed (GstFFMpegVidDec * ffmpegdec,
AVCodecContext * context);
@ -1034,11 +1034,14 @@ no_frame:
}
static gboolean
picture_changed (GstFFMpegVidDec * ffmpegdec, AVFrame * picture)
picture_changed (GstFFMpegVidDec * ffmpegdec, AVFrame * picture,
gboolean one_field)
{
gint pic_field_order = 0;
if (picture->interlaced_frame) {
if (one_field) {
pic_field_order = ffmpegdec->pic_field_order;
} else if (picture->interlaced_frame) {
if (picture->repeat_pict)
pic_field_order |= GST_VIDEO_BUFFER_FLAG_RFF;
if (picture->top_field_first)
@ -1066,7 +1069,7 @@ context_changed (GstFFMpegVidDec * ffmpegdec, AVCodecContext * context)
static gboolean
update_video_context (GstFFMpegVidDec * ffmpegdec, AVCodecContext * context,
AVFrame * picture)
AVFrame * picture, gboolean one_field)
{
gint pic_field_order = 0;
@ -1077,7 +1080,7 @@ update_video_context (GstFFMpegVidDec * ffmpegdec, AVCodecContext * context,
pic_field_order |= GST_VIDEO_BUFFER_FLAG_TFF;
}
if (!picture_changed (ffmpegdec, picture)
if (!picture_changed (ffmpegdec, picture, one_field)
&& !context_changed (ffmpegdec, context))
return FALSE;
@ -1303,8 +1306,9 @@ gst_ffmpegviddec_negotiate (GstFFMpegVidDec * ffmpegdec,
GstStructure *in_s;
GstVideoInterlaceMode interlace_mode;
gint caps_height;
gboolean one_field = ! !(flags & GST_VIDEO_BUFFER_FLAG_ONEFIELD);
if (!update_video_context (ffmpegdec, context, picture))
if (!update_video_context (ffmpegdec, context, picture, one_field))
return TRUE;
caps_height = ffmpegdec->pic_height;