| /* GStreamer |
| * Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu> |
| * Copyright (C) 2005 Edgard Lima <edgard.lima@gmail.com> |
| * Copyright (C) 2005 Zeeshan Ali <zeenix@gmail.com> |
| * Copyright (C) 2008 Axis Communications <dev-gstreamer@axis.com> |
| * |
| * 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., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include "config.h" |
| #endif |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <gst/rtp/gstrtpbuffer.h> |
| #include <gst/audio/audio.h> |
| |
| #include "gstrtpg726depay.h" |
| #include "gstrtputils.h" |
| |
| GST_DEBUG_CATEGORY_STATIC (rtpg726depay_debug); |
| #define GST_CAT_DEFAULT (rtpg726depay_debug) |
| |
| #define DEFAULT_BIT_RATE 32000 |
| #define DEFAULT_BLOCK_ALIGN 4 |
| #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 |
| }; |
| |
| 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\", " |
| "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 }, " |
| "block_align = (int) { 2, 3, 4, 5 }, " "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 (GstRTPBaseDepayload * depayload, |
| GstRTPBuffer * rtp); |
| static gboolean gst_rtp_g726_depay_setcaps (GstRTPBaseDepayload * depayload, |
| GstCaps * caps); |
| |
| #define gst_rtp_g726_depay_parent_class parent_class |
| G_DEFINE_TYPE (GstRtpG726Depay, gst_rtp_g726_depay, |
| GST_TYPE_RTP_BASE_DEPAYLOAD); |
| |
| static void |
| gst_rtp_g726_depay_class_init (GstRtpG726DepayClass * klass) |
| { |
| GObjectClass *gobject_class; |
| GstElementClass *gstelement_class; |
| GstRTPBaseDepayloadClass *gstrtpbasedepayload_class; |
| |
| GST_DEBUG_CATEGORY_INIT (rtpg726depay_debug, "rtpg726depay", 0, |
| "G.726 RTP Depayloader"); |
| |
| gobject_class = (GObjectClass *) klass; |
| gstelement_class = (GstElementClass *) klass; |
| gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) 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)); |
| |
| gst_element_class_add_static_pad_template (gstelement_class, |
| &gst_rtp_g726_depay_src_template); |
| gst_element_class_add_static_pad_template (gstelement_class, |
| &gst_rtp_g726_depay_sink_template); |
| |
| gst_element_class_set_static_metadata (gstelement_class, |
| "RTP G.726 depayloader", "Codec/Depayloader/Network/RTP", |
| "Extracts G.726 audio from RTP packets", |
| "Axis Communications <dev-gstreamer@axis.com>"); |
| |
| gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_g726_depay_process; |
| gstrtpbasedepayload_class->set_caps = gst_rtp_g726_depay_setcaps; |
| } |
| |
| static void |
| gst_rtp_g726_depay_init (GstRtpG726Depay * rtpG726depay) |
| { |
| GstRTPBaseDepayload *depayload; |
| |
| depayload = GST_RTP_BASE_DEPAYLOAD (rtpG726depay); |
| |
| gst_pad_use_fixed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload)); |
| |
| rtpG726depay->force_aal2 = DEFAULT_FORCE_AAL2; |
| } |
| |
| static gboolean |
| gst_rtp_g726_depay_setcaps (GstRTPBaseDepayload * 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; |
| depay->block_align = DEFAULT_BLOCK_ALIGN; |
| } 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; |
| depay->block_align = 2; |
| } else if (g_ascii_strcasecmp (encoding_name, "G726-24") == 0) { |
| depay->bitrate = 24000; |
| depay->block_align = 3; |
| } else if (g_ascii_strcasecmp (encoding_name, "G726-32") == 0) { |
| depay->bitrate = 32000; |
| depay->block_align = 4; |
| } else if (g_ascii_strcasecmp (encoding_name, "G726-40") == 0) { |
| depay->bitrate = 40000; |
| depay->block_align = 5; |
| } 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, |
| "block_align", G_TYPE_INT, depay->block_align, |
| "layout", G_TYPE_STRING, LAYOUT_G726, NULL); |
| |
| ret = gst_pad_set_caps (GST_RTP_BASE_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 (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp) |
| { |
| GstRtpG726Depay *depay; |
| GstBuffer *outbuf = NULL; |
| gboolean marker; |
| |
| depay = GST_RTP_G726_DEPAY (depayload); |
| |
| marker = gst_rtp_buffer_get_marker (rtp); |
| |
| GST_DEBUG ("process : got %" G_GSIZE_FORMAT " bytes, mark %d ts %u seqn %d", |
| gst_buffer_get_size (rtp->buffer), marker, |
| gst_rtp_buffer_get_timestamp (rtp), gst_rtp_buffer_get_seq (rtp)); |
| |
| if (depay->aal2 || depay->force_aal2) { |
| /* AAL2, we can just copy the bytes */ |
| outbuf = gst_rtp_buffer_get_payload_buffer (rtp); |
| if (!outbuf) |
| goto bad_len; |
| gst_rtp_drop_non_audio_meta (depay, outbuf); |
| } else { |
| guint8 *in, *out, tmp; |
| guint len; |
| GstMapInfo map; |
| |
| in = gst_rtp_buffer_get_payload (rtp); |
| len = gst_rtp_buffer_get_payload_len (rtp); |
| |
| outbuf = gst_rtp_buffer_get_payload_buffer (rtp); |
| if (!outbuf) |
| goto bad_len; |
| outbuf = gst_buffer_make_writable (outbuf); |
| |
| gst_rtp_drop_non_audio_meta (depay, outbuf); |
| |
| gst_buffer_map (outbuf, &map, GST_MAP_WRITE); |
| out = map.data; |
| |
| /* 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; |
| } |
| } |
| gst_buffer_unmap (outbuf, &map); |
| } |
| |
| if (marker) { |
| /* mark start of talkspurt with RESYNC */ |
| GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_RESYNC); |
| } |
| |
| 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); |
| } |
