/* prepare a buffer for transmission by passing data through libvorbis */
static GstBuffer *
gst_vorbis_enc_buffer_from_packet (GstVorbisEnc * vorbisenc,
ogg_packet * packet)
{
GstBuffer *outbuf;
outbuf = gst_buffer_new_and_alloc (packet->bytes);
memcpy (GST_BUFFER_DATA (outbuf), packet->packet, packet->bytes);
/* see ext/ogg/README; OFFSET_END takes "our" granulepos, OFFSET its
* time representation */
GST_BUFFER_OFFSET_END (outbuf) = packet->granulepos +
vorbisenc->granulepos_offset;
GST_BUFFER_OFFSET (outbuf) = granulepos_to_timestamp (vorbisenc,
GST_BUFFER_OFFSET_END (outbuf));
GST_BUFFER_TIMESTAMP (outbuf) = vorbisenc->next_ts;
/* update the next timestamp, taking granulepos_offset and subgranule offset
* into account */
vorbisenc->next_ts =
granulepos_to_timestamp_offset (vorbisenc, packet->granulepos);
GST_BUFFER_DURATION (outbuf) =
vorbisenc->next_ts - GST_BUFFER_TIMESTAMP (outbuf);
if (vorbisenc->next_discont) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
vorbisenc->next_discont = FALSE;
}
GST_LOG_OBJECT (vorbisenc, "encoded buffer of %d bytes",
GST_BUFFER_SIZE (outbuf));
return outbuf;
}
/* prepare a buffer for transmission by passing data through libtheora */
static GstFlowReturn
theora_buffer_from_packet (GstTheoraEnc * enc, ogg_packet * packet,
GstClockTime timestamp, GstClockTime running_time,
GstClockTime duration, GstBuffer ** buffer)
{
GstBuffer *buf;
GstFlowReturn ret = GST_FLOW_OK;
buf = gst_buffer_new_and_alloc (packet->bytes);
if (!buf) {
GST_WARNING_OBJECT (enc, "Could not allocate buffer");
ret = GST_FLOW_ERROR;
goto done;
}
memcpy (GST_BUFFER_DATA (buf), packet->packet, packet->bytes);
gst_buffer_set_caps (buf, GST_PAD_CAPS (enc->srcpad));
/* see ext/ogg/README; OFFSET_END takes "our" granulepos, OFFSET its
* time representation */
GST_BUFFER_OFFSET_END (buf) =
granulepos_add (packet->granulepos, enc->granulepos_offset,
enc->granule_shift);
GST_BUFFER_OFFSET (buf) = granulepos_to_timestamp (enc,
GST_BUFFER_OFFSET_END (buf));
GST_BUFFER_TIMESTAMP (buf) = timestamp;
GST_BUFFER_DURATION (buf) = duration;
if (enc->next_discont) {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
enc->next_discont = FALSE;
}
/* the second most significant bit of the first data byte is cleared
* for keyframes */
if ((packet->packet[0] & 0x40) == 0) {
GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
} else {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
}
enc->packetno++;
done:
*buffer = buf;
return ret;
}
static GstFlowReturn
theora_enc_pre_push (GstVideoEncoder * benc, GstVideoCodecFrame * frame)
{
GstTheoraEnc *enc = GST_THEORA_ENC (benc);
guint64 pfn;
/* see ext/ogg/README; OFFSET_END takes "our" granulepos, OFFSET its
* time representation */
/* granulepos from sync frame */
pfn = frame->presentation_frame_number - frame->distance_from_sync;
/* correct to correspond to linear running time */
pfn -= enc->pfn_offset;
pfn += enc->granulepos_offset + 1;
/* granulepos */
GST_BUFFER_OFFSET_END (frame->output_buffer) =
(pfn << enc->info.keyframe_granule_shift) + frame->distance_from_sync;
GST_BUFFER_OFFSET (frame->output_buffer) = granulepos_to_timestamp (enc,
GST_BUFFER_OFFSET_END (frame->output_buffer));
return GST_FLOW_OK;
}
