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openh264enc: fix broken header AU emission by base class

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This encoder advertises alignment=au as output format, which means
each output frame should contain a full decodable access unit.

The video encoder base class is not aware of our output alignment
and will output spurious buffers with just the SPS/PPS inside when
we call gst_video_encoder_set_headers(), which is broken because
each buffer is supposed to contain a full decodable access unit
in our case.

Just don't tell the base class about our headers, they will be
sent at the beginning of each IDR frame anyway.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2178>
This commit is contained in:
Tim-Philipp Müller 2021-04-20 20:04:33 +01:00
parent 90c1732849
commit 67a49be61f
1 changed files with 0 additions and 25 deletions
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25
ext/openh264/gstopenh264enc.cpp
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@ -885,7 +885,6 @@ gst_openh264enc_handle_frame (GstVideoEncoder * encoder,
gfloat fps;
gint i, j;
gsize buf_length = 0;
GList* headers = NULL;
GST_OBJECT_LOCK (openh264enc);
@ -1034,34 +1033,10 @@ gst_openh264enc_handle_frame (GstVideoEncoder * encoder,
for (j = 0; j < frame_info.sLayerInfo[i].iNalCount; j++) {
layer_size += frame_info.sLayerInfo[i].pNalLengthInByte[j];
}
/* detect header with NON_VIDEO_CODING_LAYER and fill headers list */
if (frame_info.sLayerInfo[i].uiLayerType == NON_VIDEO_CODING_LAYER) {
int nal_type;
gint nal_offset = 0;
GstBuffer* hdr = gst_buffer_new_and_alloc (layer_size);
GST_BUFFER_FLAG_SET (hdr, GST_BUFFER_FLAG_HEADER);
for (j = 0; j < frame_info.sLayerInfo[i].iNalCount; j++) {
if (j > 0)
nal_offset = nal_offset + frame_info.sLayerInfo[i].pNalLengthInByte[j-1];
nal_type = ((* (frame_info.sLayerInfo[i].pBsBuf + nal_offset + 4)) & 0x1f);
/* Note: This only works if SPS/PPS are the first two NALs in which case
* nal_offset is the same for both the output and the bitstream buffer */
if (nal_type == NAL_SPS || nal_type == NAL_PPS) {
gst_buffer_fill (hdr, nal_offset,
frame_info.sLayerInfo[i].pBsBuf + nal_offset,
frame_info.sLayerInfo[i].pNalLengthInByte[j]);
}
}
headers = g_list_append (headers, hdr); /* take ownership of hdr */
}
gst_buffer_fill (frame->output_buffer, buf_length, frame_info.sLayerInfo[i].pBsBuf, layer_size);
buf_length += layer_size;
}
/*Set headers from the frame_info*/
if (headers)
gst_video_encoder_set_headers (encoder, headers);
GST_LOG_OBJECT (openh264enc, "openh264 picture %scoded OK!",
(ret != cmResultSuccess) ? "NOT " : "");