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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2025-01-26 17:18:15 +00:00
mpegtspacketizer: Reduce usage of GstAdapter
Peek as much as possible in one go. Ideally we should remove usage of adapter altogether, but for the time being it provides a big enough speedup (around 2 times faster per packet processed).
This commit is contained in:
Edward Hervey
parent
f0867c7247
commit
5f7ecaa0f1
1 changed files with 62 additions and 20 deletions
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@ -92,6 +92,12 @@ typedef struct
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struct _MpegTSPacketizerPrivate
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{
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/* Shortcuts for adapter usage */
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guint available;
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guint8 *mapped;
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guint offset;
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guint mapped_size;
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/* Used for bitrate calculation */
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/* FIXME : Replace this later on with a balanced tree or sequence */
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guint64 first_offset;
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@ -215,6 +221,11 @@ mpegts_packetizer_init (MpegTSPacketizer2 * packetizer)
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packetizer->calculate_offset = FALSE;
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mpegts_packetizer_reset_skew (packetizer);
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packetizer->priv->available = 0;
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packetizer->priv->mapped = NULL;
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packetizer->priv->mapped_size = 0;
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packetizer->priv->offset = 0;
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packetizer->priv->first_offset = -1;
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packetizer->priv->first_pcr = -1;
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packetizer->priv->first_pcr_ts = GST_CLOCK_TIME_NONE;
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@ -2247,6 +2258,10 @@ mpegts_packetizer_clear (MpegTSPacketizer2 * packetizer)
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gst_adapter_clear (packetizer->adapter);
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packetizer->offset = 0;
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packetizer->empty = TRUE;
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packetizer->priv->available = 0;
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packetizer->priv->mapped = NULL;
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packetizer->priv->mapped_size = 0;
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packetizer->priv->offset = 0;
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packetizer->priv->last_in_time = GST_CLOCK_TIME_NONE;
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}
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@ -2265,6 +2280,10 @@ mpegts_packetizer_flush (MpegTSPacketizer2 * packetizer)
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packetizer->offset = 0;
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packetizer->empty = TRUE;
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packetizer->priv->available = 0;
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packetizer->priv->mapped = NULL;
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packetizer->priv->offset = 0;
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packetizer->priv->mapped_size = 0;
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packetizer->priv->last_in_time = GST_CLOCK_TIME_NONE;
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}
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@ -2301,6 +2320,7 @@ mpegts_packetizer_push (MpegTSPacketizer2 * packetizer, GstBuffer * buffer)
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GST_DEBUG ("Pushing %" G_GSIZE_FORMAT " byte from offset %" G_GUINT64_FORMAT,
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gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
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gst_adapter_push (packetizer->adapter, buffer);
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packetizer->priv->available += gst_buffer_get_size (buffer);
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/* If buffer timestamp is valid, store it */
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if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buffer)))
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packetizer->priv->last_in_time = GST_BUFFER_TIMESTAMP (buffer);
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@ -2321,8 +2341,7 @@ mpegts_try_discover_packet_size (MpegTSPacketizer2 * packetizer)
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dest = g_malloc (MPEGTS_MAX_PACKETSIZE * 4);
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/* wait for 3 sync bytes */
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while (gst_adapter_available (packetizer->adapter) >=
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MPEGTS_MAX_PACKETSIZE * 4) {
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while (packetizer->priv->available >= MPEGTS_MAX_PACKETSIZE * 4) {
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/* check for sync bytes */
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gst_adapter_copy (packetizer->adapter, dest, 0, MPEGTS_MAX_PACKETSIZE * 4);
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@ -2358,6 +2377,7 @@ mpegts_try_discover_packet_size (MpegTSPacketizer2 * packetizer)
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/* Skip MPEGTS_MAX_PACKETSIZE */
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gst_adapter_flush (packetizer->adapter, MPEGTS_MAX_PACKETSIZE);
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packetizer->priv->available -= MPEGTS_MAX_PACKETSIZE;
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packetizer->offset += MPEGTS_MAX_PACKETSIZE;
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}
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@ -2371,6 +2391,7 @@ mpegts_try_discover_packet_size (MpegTSPacketizer2 * packetizer)
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GST_DEBUG ("Flushing out %d bytes", pos);
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gst_adapter_flush (packetizer->adapter, pos);
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packetizer->offset += pos;
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packetizer->priv->available -= MPEGTS_MAX_PACKETSIZE;
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}
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} else {
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/* drop invalid data and move to the next possible packets */
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@ -2387,7 +2408,7 @@ mpegts_packetizer_has_packets (MpegTSPacketizer2 * packetizer)
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if (!mpegts_try_discover_packet_size (packetizer))
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return FALSE;
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}
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return gst_adapter_available (packetizer->adapter) >= packetizer->packet_size;
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return packetizer->priv->available >= packetizer->packet_size;
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}
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MpegTSPacketizerPacketReturn
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@ -2395,19 +2416,27 @@ mpegts_packetizer_next_packet (MpegTSPacketizer2 * packetizer,
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MpegTSPacketizerPacket * packet)
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{
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guint avail;
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int i;
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if (G_UNLIKELY (!packetizer->know_packet_size)) {
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if (!mpegts_try_discover_packet_size (packetizer))
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return PACKET_NEED_MORE;
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}
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while ((avail =
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gst_adapter_available (packetizer->adapter)) >=
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packetizer->packet_size) {
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guint i;
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packet->data_start = (guint8 *) gst_adapter_map (packetizer->adapter,
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packetizer->packet_size);
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while ((avail = packetizer->priv->available) >= packetizer->packet_size) {
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GST_DEBUG ("mapped:%p, mapped_size:%d, offset:%d",
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packetizer->priv->mapped,
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packetizer->priv->mapped_size, packetizer->priv->offset);
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if (packetizer->priv->mapped == NULL) {
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packetizer->priv->mapped_size =
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packetizer->priv->available -
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(packetizer->priv->available % packetizer->packet_size);
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packetizer->priv->mapped =
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(guint8 *) gst_adapter_map (packetizer->adapter,
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packetizer->priv->mapped_size);
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packetizer->priv->offset = 0;
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}
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packet->data_start = packetizer->priv->mapped + packetizer->priv->offset;
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/* M2TS packets don't start with the sync byte, all other variants do */
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if (packetizer->packet_size == MPEGTS_M2TS_PACKETSIZE)
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@ -2420,7 +2449,7 @@ mpegts_packetizer_next_packet (MpegTSPacketizer2 * packetizer,
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packet->offset = packetizer->offset;
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GST_DEBUG ("offset %" G_GUINT64_FORMAT, packet->offset);
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packetizer->offset += packetizer->packet_size;
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GST_MEMDUMP ("buffer", packet->data_start, 16);
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GST_MEMDUMP ("data_start", packet->data_start, 16);
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packet->origts = packetizer->priv->last_in_time;
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/* Check sync byte */
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@ -2434,11 +2463,6 @@ mpegts_packetizer_next_packet (MpegTSPacketizer2 * packetizer,
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if (packet->data_start[i] == 0x47)
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break;
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if (G_UNLIKELY (i == packetizer->packet_size)) {
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GST_ERROR ("REALLY lost the sync");
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goto done;
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}
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if (packetizer->packet_size == MPEGTS_M2TS_PACKETSIZE) {
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if (i >= 4)
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i -= 4;
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@ -2447,9 +2471,16 @@ mpegts_packetizer_next_packet (MpegTSPacketizer2 * packetizer,
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}
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gst_adapter_flush (packetizer->adapter, i);
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/* Pop out the remaining data... */
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packetizer->priv->offset += i;
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packetizer->priv->available -= i;
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if (G_UNLIKELY (packetizer->priv->available < packetizer->packet_size)) {
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gst_adapter_flush (packetizer->adapter, packetizer->priv->offset);
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packetizer->priv->mapped = NULL;
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}
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continue;
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}
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done:
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return PACKET_NEED_MORE;
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got_valid_packet:
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@ -2463,8 +2494,14 @@ mpegts_packetizer_process_next_packet (MpegTSPacketizer2 * packetizer)
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MpegTSPacketizerPacketReturn ret;
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ret = mpegts_packetizer_next_packet (packetizer, &packet);
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if (ret != PACKET_NEED_MORE)
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gst_adapter_flush (packetizer->adapter, packetizer->packet_size);
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if (ret != PACKET_NEED_MORE) {
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packetizer->priv->offset += packetizer->packet_size;
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packetizer->priv->available -= packetizer->packet_size;
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if (G_UNLIKELY (packetizer->priv->available < packetizer->packet_size)) {
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gst_adapter_flush (packetizer->adapter, packetizer->priv->offset);
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packetizer->priv->mapped = NULL;
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}
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}
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return ret;
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}
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@ -2473,7 +2510,12 @@ mpegts_packetizer_clear_packet (MpegTSPacketizer2 * packetizer,
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MpegTSPacketizerPacket * packet)
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{
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memset (packet, 0, sizeof (MpegTSPacketizerPacket));
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gst_adapter_flush (packetizer->adapter, packetizer->packet_size);
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packetizer->priv->offset += packetizer->packet_size;
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packetizer->priv->available -= packetizer->packet_size;
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if (G_UNLIKELY (packetizer->priv->available < packetizer->packet_size)) {
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gst_adapter_flush (packetizer->adapter, packetizer->priv->offset);
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packetizer->priv->mapped = NULL;
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}
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}
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gboolean
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