static GstFlowReturn
gst_vdp_mpeg_dec_chain (GstPad * pad, GstBuffer * buffer)
{
GstVdpMpegDec *mpeg_dec = GST_VDP_MPEG_DEC (gst_pad_get_parent (pad));
GstVdpMpegPacketizer packetizer;
GstBuffer *buf;
GstFlowReturn ret = GST_FLOW_OK;
if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
GST_DEBUG_OBJECT (mpeg_dec, "Received discont buffer");
gst_vdp_mpeg_dec_flush (mpeg_dec);
}
gst_vdp_mpeg_packetizer_init (&packetizer, buffer);
while ((buf = gst_vdp_mpeg_packetizer_get_next_packet (&packetizer))) {
GstBitReader b_reader = GST_BIT_READER_INIT_FROM_BUFFER (buf);
guint32 sync_code;
guint8 start_code;
/* skip sync_code */
gst_bit_reader_get_bits_uint32 (&b_reader, &sync_code, 8 * 3);
/* start_code */
gst_bit_reader_get_bits_uint8 (&b_reader, &start_code, 8);
if (start_code >= MPEG_PACKET_SLICE_MIN
&& start_code <= MPEG_PACKET_SLICE_MAX) {
GST_DEBUG_OBJECT (mpeg_dec, "MPEG_PACKET_SLICE");
gst_buffer_ref (buf);
gst_adapter_push (mpeg_dec->adapter, buf);
mpeg_dec->vdp_info.slice_count++;
}
switch (start_code) {
case MPEG_PACKET_PICTURE:
GST_DEBUG_OBJECT (mpeg_dec, "MPEG_PACKET_PICTURE");
if (!gst_vdp_mpeg_dec_parse_picture (mpeg_dec, buf))
goto done;
break;
case MPEG_PACKET_SEQUENCE:
GST_DEBUG_OBJECT (mpeg_dec, "MPEG_PACKET_SEQUENCE");
gst_vdp_mpeg_dec_parse_sequence (mpeg_dec, buf);
break;
case MPEG_PACKET_EXTENSION:
{
guint8 ext_code;
GST_DEBUG_OBJECT (mpeg_dec, "MPEG_PACKET_EXTENSION");
/* ext_code */
gst_bit_reader_get_bits_uint8 (&b_reader, &ext_code, 4);
switch (ext_code) {
case MPEG_PACKET_EXT_PICTURE_CODING:
GST_DEBUG_OBJECT (mpeg_dec, "MPEG_PACKET_EXT_PICTURE_CODING");
gst_vdp_mpeg_dec_parse_picture_coding (mpeg_dec, buf);
break;
case MPEG_PACKET_EXT_QUANT_MATRIX:
GST_DEBUG_OBJECT (mpeg_dec, "MPEG_PACKET_EXT_QUANT_MATRIX");
gst_vdp_mpeg_dec_parse_quant_matrix (mpeg_dec, buf);
break;
default:
break;
}
break;
}
case MPEG_PACKET_GOP:
GST_DEBUG_OBJECT (mpeg_dec, "MPEG_PACKET_GOP");
gst_vdp_mpeg_dec_parse_gop (mpeg_dec, buf);
break;
default:
break;
}
gst_buffer_unref (buf);
}
if (mpeg_dec->state == GST_VDP_MPEG_DEC_NEED_SEQUENCE ||
mpeg_dec->state == GST_VDP_MPEG_DEC_NEED_GOP) {
gst_adapter_clear (mpeg_dec->adapter);
goto done;
}
if (mpeg_dec->vdp_info.slice_count > 0)
ret = gst_vdp_mpeg_dec_decode (mpeg_dec, GST_BUFFER_TIMESTAMP (buffer),
GST_BUFFER_SIZE (buffer));
done:
gst_object_unref (mpeg_dec);
return ret;
}
static gboolean
gst_rtp_mp4g_pay_parse_audio_config (GstRtpMP4GPay * rtpmp4gpay,
GstBuffer * buffer)
{
GstMapInfo map;
guint8 objectType = 0;
guint8 samplingIdx = 0;
guint8 channelCfg = 0;
GstBitReader br;
gst_buffer_map (buffer, &map, GST_MAP_READ);
gst_bit_reader_init (&br, map.data, map.size);
/* any object type is fine, we need to copy it to the profile-level-id field. */
if (!gst_bit_reader_get_bits_uint8 (&br, &objectType, 5))
goto too_short;
if (objectType == 0)
goto invalid_object;
if (!gst_bit_reader_get_bits_uint8 (&br, &samplingIdx, 4))
goto too_short;
/* only fixed values for now */
if (samplingIdx > 12 && samplingIdx != 15)
goto wrong_freq;
if (!gst_bit_reader_get_bits_uint8 (&br, &channelCfg, 4))
goto too_short;
if (channelCfg > 7)
goto wrong_channels;
/* rtp rate depends on sampling rate of the audio */
if (samplingIdx == 15) {
guint32 rate = 0;
/* index of 15 means we get the rate in the next 24 bits */
if (!gst_bit_reader_get_bits_uint32 (&br, &rate, 24))
goto too_short;
rtpmp4gpay->rate = rate;
} else {
/* else use the rate from the table */
rtpmp4gpay->rate = sampling_table[samplingIdx];
}
rtpmp4gpay->frame_len = 1024;
switch (objectType) {
case 1:
case 2:
case 3:
case 4:
case 6:
case 7:
{
guint8 frameLenFlag = 0;
if (gst_bit_reader_get_bits_uint8 (&br, &frameLenFlag, 1))
if (frameLenFlag)
rtpmp4gpay->frame_len = 960;
break;
}
default:
break;
}
/* extra rtp params contain the number of channels */
g_free (rtpmp4gpay->params);
rtpmp4gpay->params = g_strdup_printf ("%d", channelCfg);
/* audio stream type */
rtpmp4gpay->streamtype = "5";
/* mode only high bitrate for now */
rtpmp4gpay->mode = "AAC-hbr";
/* profile */
g_free (rtpmp4gpay->profile);
rtpmp4gpay->profile = g_strdup_printf ("%d", objectType);
GST_DEBUG_OBJECT (rtpmp4gpay,
"objectType: %d, samplingIdx: %d (%d), channelCfg: %d, frame_len %d",
objectType, samplingIdx, rtpmp4gpay->rate, channelCfg,
rtpmp4gpay->frame_len);
gst_buffer_unmap (buffer, &map);
return TRUE;
/* ERROR */
too_short:
{
GST_ELEMENT_ERROR (rtpmp4gpay, STREAM, FORMAT,
(NULL), ("config string too short"));
gst_buffer_unmap (buffer, &map);
return FALSE;
}
invalid_object:
{
GST_ELEMENT_ERROR (rtpmp4gpay, STREAM, FORMAT,
(NULL), ("invalid object type"));
gst_buffer_unmap (buffer, &map);
return FALSE;
}
wrong_freq:
{
GST_ELEMENT_ERROR (rtpmp4gpay, STREAM, NOT_IMPLEMENTED,
(NULL), ("unsupported frequency index %d", samplingIdx));
gst_buffer_unmap (buffer, &map);
return FALSE;
}
wrong_channels:
{
GST_ELEMENT_ERROR (rtpmp4gpay, STREAM, NOT_IMPLEMENTED,
(NULL), ("unsupported number of channels %d, must < 8", channelCfg));
gst_buffer_unmap (buffer, &map);
return FALSE;
}
}
