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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-07-03 13:16:04 +00:00
g726depay: implement RFC3551 packing
We implemented the AAL2 packing, add the encoding-name for those to the caps and a property to force AAL2 decoding (always TRUE for now). Implement RFC3551 unpacking for regular G726. See #567140.
This commit is contained in:
Wim Taymans
parent
c34d5aa016
commit
0802ba8730
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@ -49,9 +49,13 @@ enum
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LAST_SIGNAL
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};
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#define DEFAULT_FORCE_AAL2 TRUE
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enum
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{
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ARG_0
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PROP_0,
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PROP_FORCE_AAL2,
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PROP_LAST
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};
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static GstStaticPadTemplate gst_rtp_g726_depay_sink_template =
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@ -61,7 +65,8 @@ static GstStaticPadTemplate gst_rtp_g726_depay_sink_template =
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GST_STATIC_CAPS ("application/x-rtp, "
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"media = (string) \"audio\", "
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"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
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"encoding-name = (string) { \"G726\", \"G726-16\", \"G726-24\", \"G726-32\", \"G726-40\"}, "
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"encoding-name = (string) { \"G726\", \"G726-16\", \"G726-24\", \"G726-32\", \"G726-40\", "
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"\"AAL2-G726-16\", \"AAL2-G726-24\", \"AAL2-G726-32\", \"AAL2-G726-40\" }, "
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"clock-rate = (int) 8000;")
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);
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@ -122,6 +127,8 @@ gst_rtp_g726_depay_init (GstRtpG726Depay * rtpG726depay,
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depayload = GST_BASE_RTP_DEPAYLOAD (rtpG726depay);
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gst_pad_use_fixed_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload));
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rtpG726depay->force_aal2 = DEFAULT_FORCE_AAL2;
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}
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static gboolean
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@ -132,7 +139,9 @@ gst_rtp_g726_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
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gboolean ret;
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gint clock_rate;
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const gchar *encoding_name;
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gint bitrate;
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GstRtpG726Depay *depay;
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depay = GST_RTP_G726_DEPAY (depayload);
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structure = gst_caps_get_structure (caps, 0);
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@ -140,52 +149,173 @@ gst_rtp_g726_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
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clock_rate = 8000; /* default */
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depayload->clock_rate = clock_rate;
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depay->aal2 = FALSE;
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encoding_name = gst_structure_get_string (structure, "encoding-name");
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if (encoding_name == NULL || g_ascii_strcasecmp (encoding_name, "G726") == 0) {
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bitrate = DEFAULT_BIT_RATE;
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} else if (g_ascii_strcasecmp (encoding_name, "G726-16") == 0) {
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bitrate = 16000;
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} else if (g_ascii_strcasecmp (encoding_name, "G726-24") == 0) {
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bitrate = 24000;
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} else if (g_ascii_strcasecmp (encoding_name, "G726-32") == 0) {
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bitrate = 32000;
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} else if (g_ascii_strcasecmp (encoding_name, "G726-40") == 0) {
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bitrate = 40000;
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depay->bitrate = DEFAULT_BIT_RATE;
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} else {
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GST_WARNING ("Could not determine bitrate from encoding-name (%s)",
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encoding_name);
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ret = FALSE;
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goto done;
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if (g_str_has_prefix (encoding_name, "AAL2-")) {
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depay->aal2 = TRUE;
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encoding_name += 5;
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}
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if (g_ascii_strcasecmp (encoding_name, "G726-16") == 0) {
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depay->bitrate = 16000;
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} else if (g_ascii_strcasecmp (encoding_name, "G726-24") == 0) {
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depay->bitrate = 24000;
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} else if (g_ascii_strcasecmp (encoding_name, "G726-32") == 0) {
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depay->bitrate = 32000;
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} else if (g_ascii_strcasecmp (encoding_name, "G726-40") == 0) {
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depay->bitrate = 40000;
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} else
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goto unknown_encoding;
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}
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GST_DEBUG ("RTP G.726 depayloader, bitrate set to %d\n", bitrate);
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GST_DEBUG ("RTP G.726 depayloader, bitrate set to %d\n", depay->bitrate);
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srccaps = gst_caps_new_simple ("audio/x-adpcm",
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"channels", G_TYPE_INT, 1,
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"rate", G_TYPE_INT, clock_rate,
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"bitrate", G_TYPE_INT, bitrate,
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"bitrate", G_TYPE_INT, depay->bitrate,
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"layout", G_TYPE_STRING, LAYOUT_G726, NULL);
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ret = gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload), srccaps);
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gst_caps_unref (srccaps);
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done:
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return ret;
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/* ERRORS */
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unknown_encoding:
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{
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GST_WARNING ("Could not determine bitrate from encoding-name (%s)",
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encoding_name);
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return FALSE;
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}
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}
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static GstBuffer *
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gst_rtp_g726_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
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{
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GstRtpG726Depay *depay;
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GstBuffer *outbuf = NULL;
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gboolean marker;
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depay = GST_RTP_G726_DEPAY (depayload);
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marker = gst_rtp_buffer_get_marker (buf);
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GST_DEBUG ("process : got %d bytes, mark %d ts %u seqn %d",
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GST_BUFFER_SIZE (buf), marker,
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gst_rtp_buffer_get_timestamp (buf), gst_rtp_buffer_get_seq (buf));
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outbuf = gst_rtp_buffer_get_payload_buffer (buf);
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if (depay->aal2 || depay->force_aal2) {
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/* AAL2, we can just copy the bytes */
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outbuf = gst_rtp_buffer_get_payload_buffer (buf);
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} else {
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guint8 *in, *out, tmp;
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guint len;
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in = gst_rtp_buffer_get_payload (buf);
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len = gst_rtp_buffer_get_payload_len (buf);
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if (gst_buffer_is_writable (buf)) {
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outbuf = gst_rtp_buffer_get_payload_buffer (buf);
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} else {
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GstBuffer *copy;
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/* copy buffer */
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copy = gst_buffer_copy (buf);
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outbuf = gst_rtp_buffer_get_payload_buffer (copy);
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gst_buffer_unref (copy);
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}
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out = GST_BUFFER_DATA (outbuf);
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/* we need to reshuffle the bytes */
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switch (depay->bitrate) {
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case 16000:
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{
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/* 0
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* 0 1 2 3 4 5 6 7
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* +-+-+-+-+-+-+-+-+-
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* |D D|C C|B B|A A| ...
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* |0 1|0 1|0 1|0 1|
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* +-+-+-+-+-+-+-+-+-
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*/
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while (len > 0) {
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tmp = *in++;
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*out++ = ((tmp & 0xc0) >> 6) |
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((tmp & 0x30) >> 2) | ((tmp & 0x0c) << 2) | ((tmp & 0x03) << 6);
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len--;
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}
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break;
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}
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case 24000:
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{
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/* 0 1 2
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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* |C C|B B B|A A A|F|E E E|D D D|C|H H H|G G G|F F| ...
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* |1 2|0 1 2|0 1 2|2|0 1 2|0 1 2|0|0 1 2|0 1 2|0 1|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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*/
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while (len > 2) {
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tmp = *in++;
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*out++ = ((tmp & 0xe0) >> 5) |
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((tmp & 0x1c) << 1) | ((tmp & 0x03) << 6);
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tmp = *in++;
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*out++ = ((tmp & 0x80) >> 7) |
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((tmp & 0x70) >> 3) | ((tmp & 0x0e) << 4) | ((tmp & 0x01) << 7);
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tmp = *in++;
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*out++ = ((tmp & 0xc0) >> 6) |
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((tmp & 0x38) >> 1) | ((tmp & 0x07) << 5);
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len -= 3;
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}
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break;
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}
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case 32000:
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{
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/* 0 1
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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* |B B B B|A A A A|D D D D|C C C C| ...
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* |0 1 2 3|0 1 2 3|0 1 2 3|0 1 2 3|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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*/
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while (len > 0) {
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tmp = *in++;
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*out++ = ((tmp & 0xf0) >> 4) | ((tmp & 0x0f) << 4);
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len--;
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}
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break;
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}
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case 40000:
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{
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/* 0 1 2 3 4
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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* |B B B|A A A A A|D|C C C C C|B B|E E E E|D D D D|G G|F F F F F|E|H H H H H|G G G|
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* |2 3 4|0 1 2 3 4|4|0 1 2 3 4|0 1|1 2 3 4|0 1 2 3|3 4|0 1 2 3 4|0|0 1 2 3 4|0 1 2|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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*/
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while (len > 4) {
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tmp = *in++;
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*out++ = ((tmp & 0xf8) >> 3) | ((tmp & 0x07) << 5);
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tmp = *in++;
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*out++ = ((tmp & 0xc0) >> 6) |
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((tmp & 0x3e) << 1) | ((tmp & 0x01) << 7);
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tmp = *in++;
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*out++ = ((tmp & 0xf0) >> 4) | ((tmp & 0x0f) << 4);
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tmp = *in++;
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*out++ = ((tmp & 0x80) >> 7) |
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((tmp & 0x7c) >> 1) | ((tmp & 0x03) << 6);
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tmp = *in++;
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*out++ = ((tmp & 0xe0) >> 5) | ((tmp & 0x1f) << 3);
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len -= 5;
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}
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break;
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}
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}
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}
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if (marker) {
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/* mark start of talkspurt with discont */
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@ -38,6 +38,10 @@ typedef struct _GstRtpG726DepayClass GstRtpG726DepayClass;
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struct _GstRtpG726Depay
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{
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GstBaseRTPDepayload depayload;
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gboolean aal2;
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gboolean force_aal2;
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gint bitrate;
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};
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struct _GstRtpG726DepayClass
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