/* GStreamer * Copyright (C) 1999 Erik Walthinsen * Copyright (C) 2005 Edgard Lima * Copyright (C) 2005 Zeeshan Ali * Copyright (C) 2008 Axis Communications * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include "gstrtpg726depay.h" GST_DEBUG_CATEGORY_STATIC (rtpg726depay_debug); #define GST_CAT_DEFAULT (rtpg726depay_debug) #define DEFAULT_BIT_RATE 32000 #define SAMPLE_RATE 8000 #define LAYOUT_G726 "g726" /* RtpG726Depay signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; #define DEFAULT_FORCE_AAL2 TRUE enum { PROP_0, PROP_FORCE_AAL2, PROP_LAST }; static GstStaticPadTemplate gst_rtp_g726_depay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp, " "media = (string) \"audio\", " "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " "encoding-name = (string) { \"G726\", \"G726-16\", \"G726-24\", \"G726-32\", \"G726-40\", " "\"AAL2-G726-16\", \"AAL2-G726-24\", \"AAL2-G726-32\", \"AAL2-G726-40\" }, " "clock-rate = (int) 8000;") ); static GstStaticPadTemplate gst_rtp_g726_depay_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-adpcm, " "channels = (int) 1, " "rate = (int) 8000, " "bitrate = (int) { 16000, 24000, 32000, 40000 }, " "layout = (string) \"g726\"") ); static void gst_rtp_g726_depay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_rtp_g726_depay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static GstBuffer *gst_rtp_g726_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf); static gboolean gst_rtp_g726_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps); GST_BOILERPLATE (GstRtpG726Depay, gst_rtp_g726_depay, GstBaseRTPDepayload, GST_TYPE_BASE_RTP_DEPAYLOAD); static void gst_rtp_g726_depay_base_init (gpointer klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_g726_depay_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_g726_depay_sink_template)); gst_element_class_set_details_simple (element_class, "RTP G.726 depayloader", "Codec/Depayloader/Network/RTP", "Extracts G.726 audio from RTP packets", "Axis Communications "); } static void gst_rtp_g726_depay_class_init (GstRtpG726DepayClass * klass) { GObjectClass *gobject_class; GstBaseRTPDepayloadClass *gstbasertpdepayload_class; gobject_class = (GObjectClass *) klass; gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass; gobject_class->set_property = gst_rtp_g726_depay_set_property; gobject_class->get_property = gst_rtp_g726_depay_get_property; g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FORCE_AAL2, g_param_spec_boolean ("force-aal2", "Force AAL2", "Force AAL2 decoding for compatibility with bad payloaders", DEFAULT_FORCE_AAL2, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstbasertpdepayload_class->process = gst_rtp_g726_depay_process; gstbasertpdepayload_class->set_caps = gst_rtp_g726_depay_setcaps; GST_DEBUG_CATEGORY_INIT (rtpg726depay_debug, "rtpg726depay", 0, "G.726 RTP Depayloader"); } static void gst_rtp_g726_depay_init (GstRtpG726Depay * rtpG726depay, GstRtpG726DepayClass * klass) { GstBaseRTPDepayload *depayload; depayload = GST_BASE_RTP_DEPAYLOAD (rtpG726depay); gst_pad_use_fixed_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload)); rtpG726depay->force_aal2 = DEFAULT_FORCE_AAL2; } static gboolean gst_rtp_g726_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps) { GstCaps *srccaps; GstStructure *structure; gboolean ret; gint clock_rate; const gchar *encoding_name; GstRtpG726Depay *depay; depay = GST_RTP_G726_DEPAY (depayload); structure = gst_caps_get_structure (caps, 0); if (!gst_structure_get_int (structure, "clock-rate", &clock_rate)) clock_rate = 8000; /* default */ depayload->clock_rate = clock_rate; depay->aal2 = FALSE; encoding_name = gst_structure_get_string (structure, "encoding-name"); if (encoding_name == NULL || g_ascii_strcasecmp (encoding_name, "G726") == 0) { depay->bitrate = DEFAULT_BIT_RATE; } else { if (g_str_has_prefix (encoding_name, "AAL2-")) { depay->aal2 = TRUE; encoding_name += 5; } if (g_ascii_strcasecmp (encoding_name, "G726-16") == 0) { depay->bitrate = 16000; } else if (g_ascii_strcasecmp (encoding_name, "G726-24") == 0) { depay->bitrate = 24000; } else if (g_ascii_strcasecmp (encoding_name, "G726-32") == 0) { depay->bitrate = 32000; } else if (g_ascii_strcasecmp (encoding_name, "G726-40") == 0) { depay->bitrate = 40000; } else goto unknown_encoding; } GST_DEBUG ("RTP G.726 depayloader, bitrate set to %d\n", depay->bitrate); srccaps = gst_caps_new_simple ("audio/x-adpcm", "channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, clock_rate, "bitrate", G_TYPE_INT, depay->bitrate, "layout", G_TYPE_STRING, LAYOUT_G726, NULL); ret = gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload), srccaps); gst_caps_unref (srccaps); return ret; /* ERRORS */ unknown_encoding: { GST_WARNING ("Could not determine bitrate from encoding-name (%s)", encoding_name); return FALSE; } } static GstBuffer * gst_rtp_g726_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf) { GstRtpG726Depay *depay; GstBuffer *outbuf = NULL; gboolean marker; depay = GST_RTP_G726_DEPAY (depayload); marker = gst_rtp_buffer_get_marker (buf); GST_DEBUG ("process : got %d bytes, mark %d ts %u seqn %d", GST_BUFFER_SIZE (buf), marker, gst_rtp_buffer_get_timestamp (buf), gst_rtp_buffer_get_seq (buf)); if (depay->aal2 || depay->force_aal2) { /* AAL2, we can just copy the bytes */ outbuf = gst_rtp_buffer_get_payload_buffer (buf); if (!outbuf) goto bad_len; } else { guint8 *in, *out, tmp; guint len; in = gst_rtp_buffer_get_payload (buf); len = gst_rtp_buffer_get_payload_len (buf); if (gst_buffer_is_writable (buf)) { outbuf = gst_rtp_buffer_get_payload_buffer (buf); } else { GstBuffer *copy; /* copy buffer */ copy = gst_buffer_copy (buf); outbuf = gst_rtp_buffer_get_payload_buffer (copy); gst_buffer_unref (copy); } if (!outbuf) goto bad_len; out = GST_BUFFER_DATA (outbuf); /* we need to reshuffle the bytes, input is always of the form * A B C D ... with the number of bits depending on the bitrate. */ switch (depay->bitrate) { case 16000: { /* 0 * 0 1 2 3 4 5 6 7 * +-+-+-+-+-+-+-+-+- * |D D|C C|B B|A A| ... * |0 1|0 1|0 1|0 1| * +-+-+-+-+-+-+-+-+- */ while (len > 0) { tmp = *in++; *out++ = ((tmp & 0xc0) >> 6) | ((tmp & 0x30) >> 2) | ((tmp & 0x0c) << 2) | ((tmp & 0x03) << 6); len--; } break; } case 24000: { /* 0 1 2 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- * |C C|B B B|A A A|F|E E E|D D D|C|H H H|G G G|F F| ... * |1 2|0 1 2|0 1 2|2|0 1 2|0 1 2|0|0 1 2|0 1 2|0 1| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */ while (len > 2) { tmp = *in++; *out++ = ((tmp & 0xe0) >> 5) | ((tmp & 0x1c) << 1) | ((tmp & 0x03) << 6); tmp = *in++; *out++ = ((tmp & 0x80) >> 7) | ((tmp & 0x70) >> 3) | ((tmp & 0x0e) << 4) | ((tmp & 0x01) << 7); tmp = *in++; *out++ = ((tmp & 0xc0) >> 6) | ((tmp & 0x38) >> 1) | ((tmp & 0x07) << 5); len -= 3; } break; } case 32000: { /* 0 1 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- * |B B B B|A A A A|D D D D|C C C C| ... * |0 1 2 3|0 1 2 3|0 1 2 3|0 1 2 3| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */ while (len > 0) { tmp = *in++; *out++ = ((tmp & 0xf0) >> 4) | ((tmp & 0x0f) << 4); len--; } break; } case 40000: { /* 0 1 2 3 4 * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- * |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| * |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| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */ while (len > 4) { tmp = *in++; *out++ = ((tmp & 0xf8) >> 3) | ((tmp & 0x07) << 5); tmp = *in++; *out++ = ((tmp & 0xc0) >> 6) | ((tmp & 0x3e) << 1) | ((tmp & 0x01) << 7); tmp = *in++; *out++ = ((tmp & 0xf0) >> 4) | ((tmp & 0x0f) << 4); tmp = *in++; *out++ = ((tmp & 0x80) >> 7) | ((tmp & 0x7c) >> 1) | ((tmp & 0x03) << 6); tmp = *in++; *out++ = ((tmp & 0xe0) >> 5) | ((tmp & 0x1f) << 3); len -= 5; } break; } } } if (marker) { /* mark start of talkspurt with discont */ GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT); } return outbuf; bad_len: return NULL; } static void gst_rtp_g726_depay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstRtpG726Depay *rtpg726depay; rtpg726depay = GST_RTP_G726_DEPAY (object); switch (prop_id) { case PROP_FORCE_AAL2: rtpg726depay->force_aal2 = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_rtp_g726_depay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstRtpG726Depay *rtpg726depay; rtpg726depay = GST_RTP_G726_DEPAY (object); switch (prop_id) { case PROP_FORCE_AAL2: g_value_set_boolean (value, rtpg726depay->force_aal2); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } gboolean gst_rtp_g726_depay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtpg726depay", GST_RANK_SECONDARY, GST_TYPE_RTP_G726_DEPAY); }