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218 lines
5.9 KiB
C
218 lines
5.9 KiB
C
/* GStreamer
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* Copyright (C) <2007> Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gst/rtp/gstrtpbuffer.h>
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#include <string.h>
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#include "gstrtpac3depay.h"
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GST_DEBUG_CATEGORY_STATIC (rtpac3depay_debug);
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#define GST_CAT_DEFAULT (rtpac3depay_debug)
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static GstStaticPadTemplate gst_rtp_ac3_depay_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/ac3")
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);
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static GstStaticPadTemplate gst_rtp_ac3_depay_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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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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"clock-rate = (int) { 32000, 44100, 48000 }, "
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"encoding-name = (string) \"AC3\"")
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);
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GST_BOILERPLATE (GstRtpAC3Depay, gst_rtp_ac3_depay, GstBaseRTPDepayload,
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GST_TYPE_BASE_RTP_DEPAYLOAD);
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static gboolean gst_rtp_ac3_depay_setcaps (GstBaseRTPDepayload * depayload,
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GstCaps * caps);
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static GstBuffer *gst_rtp_ac3_depay_process (GstBaseRTPDepayload * depayload,
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GstBuffer * buf);
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static void
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gst_rtp_ac3_depay_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtp_ac3_depay_src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtp_ac3_depay_sink_template));
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gst_element_class_set_details_simple (element_class, "RTP AC3 depayloader",
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"Codec/Depayloader/Network/RTP",
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"Extracts AC3 audio from RTP packets (RFC 4184)",
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"Wim Taymans <wim.taymans@gmail.com>");
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}
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static void
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gst_rtp_ac3_depay_class_init (GstRtpAC3DepayClass * klass)
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{
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GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
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gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
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gstbasertpdepayload_class->set_caps = gst_rtp_ac3_depay_setcaps;
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gstbasertpdepayload_class->process = gst_rtp_ac3_depay_process;
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GST_DEBUG_CATEGORY_INIT (rtpac3depay_debug, "rtpac3depay", 0,
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"AC3 Audio RTP Depayloader");
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}
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static void
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gst_rtp_ac3_depay_init (GstRtpAC3Depay * rtpac3depay,
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GstRtpAC3DepayClass * klass)
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{
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/* needed because of GST_BOILERPLATE */
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}
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static gboolean
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gst_rtp_ac3_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
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{
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GstStructure *structure;
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gint clock_rate;
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GstCaps *srccaps;
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gboolean res;
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structure = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
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clock_rate = 90000; /* default */
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depayload->clock_rate = clock_rate;
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srccaps = gst_caps_new_simple ("audio/ac3", NULL);
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res = gst_pad_set_caps (depayload->srcpad, srccaps);
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gst_caps_unref (srccaps);
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return res;
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}
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struct frmsize_s
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{
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guint16 bit_rate;
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guint16 frm_size[3];
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};
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static const struct frmsize_s frmsizecod_tbl[] = {
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{32, {64, 69, 96}},
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{32, {64, 70, 96}},
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{40, {80, 87, 120}},
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{40, {80, 88, 120}},
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{48, {96, 104, 144}},
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{48, {96, 105, 144}},
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{56, {112, 121, 168}},
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{56, {112, 122, 168}},
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{64, {128, 139, 192}},
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{64, {128, 140, 192}},
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{80, {160, 174, 240}},
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{80, {160, 175, 240}},
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{96, {192, 208, 288}},
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{96, {192, 209, 288}},
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{112, {224, 243, 336}},
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{112, {224, 244, 336}},
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{128, {256, 278, 384}},
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{128, {256, 279, 384}},
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{160, {320, 348, 480}},
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{160, {320, 349, 480}},
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{192, {384, 417, 576}},
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{192, {384, 418, 576}},
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{224, {448, 487, 672}},
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{224, {448, 488, 672}},
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{256, {512, 557, 768}},
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{256, {512, 558, 768}},
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{320, {640, 696, 960}},
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{320, {640, 697, 960}},
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{384, {768, 835, 1152}},
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{384, {768, 836, 1152}},
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{448, {896, 975, 1344}},
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{448, {896, 976, 1344}},
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{512, {1024, 1114, 1536}},
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{512, {1024, 1115, 1536}},
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{576, {1152, 1253, 1728}},
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{576, {1152, 1254, 1728}},
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{640, {1280, 1393, 1920}},
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{640, {1280, 1394, 1920}}
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};
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static GstBuffer *
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gst_rtp_ac3_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
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{
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GstRtpAC3Depay *rtpac3depay;
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GstBuffer *outbuf;
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rtpac3depay = GST_RTP_AC3_DEPAY (depayload);
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{
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guint8 *payload;
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guint16 FT, NF;
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if (gst_rtp_buffer_get_payload_len (buf) < 2)
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goto empty_packet;
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payload = gst_rtp_buffer_get_payload (buf);
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/* strip off header
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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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* | MBZ | FT| NF |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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FT = payload[0] & 0x3;
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NF = payload[1];
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GST_DEBUG_OBJECT (rtpac3depay, "FT: %d, NF: %d", FT, NF);
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/* We don't bother with fragmented packets yet */
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outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, 2, -1);
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GST_DEBUG_OBJECT (rtpac3depay, "pushing buffer of size %d",
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GST_BUFFER_SIZE (outbuf));
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return outbuf;
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}
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return NULL;
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/* ERRORS */
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empty_packet:
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{
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GST_ELEMENT_WARNING (rtpac3depay, STREAM, DECODE,
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("Empty Payload."), (NULL));
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return NULL;
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}
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}
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gboolean
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gst_rtp_ac3_depay_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "rtpac3depay",
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GST_RANK_SECONDARY, GST_TYPE_RTP_AC3_DEPAY);
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}
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