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/* $Id: passthrough.c 4082 2012-04-24 13:09:14Z bennylp $ */
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* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
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* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program 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
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include <pjmedia-codec/passthrough.h>
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#include <pjmedia-codec/amr_sdp_match.h>
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#include <pjmedia/codec.h>
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#include <pjmedia/errno.h>
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#include <pjmedia/endpoint.h>
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#include <pjmedia/port.h>
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#include <pj/assert.h>
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#include <pj/string.h>
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* Only build this file if PJMEDIA_HAS_PASSTHROUGH_CODECS != 0
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#if defined(PJMEDIA_HAS_PASSTHROUGH_CODECS) && PJMEDIA_HAS_PASSTHROUGH_CODECS!=0
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#define THIS_FILE "passthrough.c"
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/* Prototypes for passthrough codecs factory */
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static pj_status_t test_alloc( pjmedia_codec_factory *factory,
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const pjmedia_codec_info *id );
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static pj_status_t default_attr( pjmedia_codec_factory *factory,
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const pjmedia_codec_info *id,
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pjmedia_codec_param *attr );
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static pj_status_t enum_codecs( pjmedia_codec_factory *factory,
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pjmedia_codec_info codecs[]);
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static pj_status_t alloc_codec( pjmedia_codec_factory *factory,
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const pjmedia_codec_info *id,
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pjmedia_codec **p_codec);
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static pj_status_t dealloc_codec( pjmedia_codec_factory *factory,
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pjmedia_codec *codec );
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/* Prototypes for passthrough codecs implementation. */
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static pj_status_t codec_init( pjmedia_codec *codec,
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static pj_status_t codec_open( pjmedia_codec *codec,
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pjmedia_codec_param *attr );
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static pj_status_t codec_close( pjmedia_codec *codec );
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static pj_status_t codec_modify(pjmedia_codec *codec,
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const pjmedia_codec_param *attr );
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static pj_status_t codec_parse( pjmedia_codec *codec,
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const pj_timestamp *ts,
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pjmedia_frame frames[]);
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static pj_status_t codec_encode( pjmedia_codec *codec,
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const struct pjmedia_frame *input,
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unsigned output_buf_len,
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struct pjmedia_frame *output);
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static pj_status_t codec_decode( pjmedia_codec *codec,
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const struct pjmedia_frame *input,
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unsigned output_buf_len,
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struct pjmedia_frame *output);
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static pj_status_t codec_recover( pjmedia_codec *codec,
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unsigned output_buf_len,
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struct pjmedia_frame *output);
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/* Definition for passthrough codecs operations. */
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static pjmedia_codec_op codec_op =
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/* Definition for passthrough codecs factory operations. */
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static pjmedia_codec_factory_op codec_factory_op =
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&pjmedia_codec_passthrough_deinit
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/* Passthrough codecs factory */
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static struct codec_factory {
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pjmedia_codec_factory base;
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pjmedia_endpt *endpt;
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/* Passthrough codecs private data. */
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typedef struct codec_private {
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pj_pool_t *pool; /**< Pool for each instance. */
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int codec_idx; /**< Codec index. */
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void *codec_setting; /**< Specific codec setting. */
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pj_uint16_t avg_frame_size; /**< Average of frame size. */
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unsigned samples_per_frame; /**< Samples per frame, for iLBC
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this can be 240 or 160, can
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only be known after codec is
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/* CUSTOM CALLBACKS */
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/* Parse frames from a packet. Default behaviour of frame parsing is
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* just separating frames based on calculating frame length derived
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* from bitrate. Implement this callback when the default behaviour is
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typedef pj_status_t (*parse_cb)(codec_private_t *codec_data, void *pkt,
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pj_size_t pkt_size, const pj_timestamp *ts,
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unsigned *frame_cnt, pjmedia_frame frames[]);
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/* Pack frames into a packet. Default behaviour of packing frames is
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* just stacking the frames with octet aligned without adding any
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* payload header. Implement this callback when the default behaviour is
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typedef pj_status_t (*pack_cb)(codec_private_t *codec_data,
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const struct pjmedia_frame_ext *input,
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unsigned output_buf_len,
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struct pjmedia_frame *output);
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/* Custom callback implementations. */
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static pj_status_t parse_amr( codec_private_t *codec_data, void *pkt,
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pj_size_t pkt_size, const pj_timestamp *ts,
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unsigned *frame_cnt, pjmedia_frame frames[]);
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static pj_status_t pack_amr ( codec_private_t *codec_data,
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const struct pjmedia_frame_ext *input,
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unsigned output_buf_len,
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struct pjmedia_frame *output);
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/* Passthrough codec implementation descriptions. */
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static struct codec_desc {
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int enabled; /* Is this codec enabled? */
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const char *name; /* Codec name. */
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pj_uint8_t pt; /* Payload type. */
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pjmedia_format_id fmt_id; /* Source format. */
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unsigned clock_rate; /* Codec's clock rate. */
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unsigned channel_count; /* Codec's channel count. */
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unsigned samples_per_frame; /* Codec's samples count. */
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unsigned def_bitrate; /* Default bitrate of this codec. */
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unsigned max_bitrate; /* Maximum bitrate of this codec. */
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pj_uint8_t frm_per_pkt; /* Default num of frames per packet.*/
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pj_uint8_t vad; /* VAD enabled/disabled. */
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pj_uint8_t plc; /* PLC enabled/disabled. */
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parse_cb parse; /* Callback to parse bitstream. */
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pack_cb pack; /* Callback to pack bitstream. */
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pjmedia_codec_fmtp dec_fmtp; /* Decoder's fmtp params. */
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# if PJMEDIA_HAS_PASSTHROUGH_CODEC_AMR
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{1, "AMR", PJMEDIA_RTP_PT_AMR, PJMEDIA_FORMAT_AMR,
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7400, 12200, 2, 1, 1,
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&parse_amr, &pack_amr
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/*, {1, {{{"octet-align", 11}, {"1", 1}}} } */
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# if PJMEDIA_HAS_PASSTHROUGH_CODEC_G729
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{1, "G729", PJMEDIA_RTP_PT_G729, PJMEDIA_FORMAT_G729,
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# if PJMEDIA_HAS_PASSTHROUGH_CODEC_ILBC
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{1, "iLBC", PJMEDIA_RTP_PT_ILBC, PJMEDIA_FORMAT_ILBC,
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13333, 15200, 1, 1, 1,
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{1, {{{"mode", 4}, {"30", 2}}} }
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# if PJMEDIA_HAS_PASSTHROUGH_CODEC_PCMU
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{1, "PCMU", PJMEDIA_RTP_PT_PCMU, PJMEDIA_FORMAT_PCMU,
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64000, 64000, 2, 1, 1
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# if PJMEDIA_HAS_PASSTHROUGH_CODEC_PCMA
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{1, "PCMA", PJMEDIA_RTP_PT_PCMA, PJMEDIA_FORMAT_PCMA,
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64000, 64000, 2, 1, 1
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#if PJMEDIA_HAS_PASSTHROUGH_CODEC_AMR
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#include <pjmedia-codec/amr_helper.h>
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typedef struct amr_settings_t {
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pjmedia_codec_amr_pack_setting enc_setting;
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pjmedia_codec_amr_pack_setting dec_setting;
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/* Pack AMR payload */
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static pj_status_t pack_amr ( codec_private_t *codec_data,
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const struct pjmedia_frame_ext *input,
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unsigned output_buf_len,
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struct pjmedia_frame *output)
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enum {MAX_FRAMES_PER_PACKET = PJMEDIA_MAX_FRAME_DURATION_MS / 20};
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pjmedia_frame frames[MAX_FRAMES_PER_PACKET];
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amr_settings_t* setting = (amr_settings_t*)codec_data->codec_setting;
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pjmedia_codec_amr_pack_setting *enc_setting = &setting->enc_setting;
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pj_assert(input->subframe_cnt <= MAX_FRAMES_PER_PACKET);
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SID_FT = (pj_uint8_t)(enc_setting->amr_nb? 8 : 9);
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for (i = 0; i < input->subframe_cnt; ++i) {
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pjmedia_frame_ext_subframe *sf;
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pjmedia_codec_amr_bit_info *info;
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sf = pjmedia_frame_ext_get_subframe(input, i);
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len = (sf->bitlen + 7) >> 3;
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info = (pjmedia_codec_amr_bit_info*) &frames[i].bit_info;
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pj_bzero(info, sizeof(*info));
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info->frame_type = 15;
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info->frame_type = pjmedia_codec_amr_get_mode2(enc_setting->amr_nb,
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info->good_quality = 1;
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info->mode = setting->enc_mode;
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if (info->frame_type == SID_FT)
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info->STI = (sf->data[4] >> 4) & 1;
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frames[i].buf = sf->data;
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frames[i].size = len;
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output->size = output_buf_len;
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return pjmedia_codec_amr_pack(frames, input->subframe_cnt, enc_setting,
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output->buf, &output->size);
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/* Parse AMR payload into frames. */
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static pj_status_t parse_amr(codec_private_t *codec_data, void *pkt,
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pj_size_t pkt_size, const pj_timestamp *ts,
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unsigned *frame_cnt, pjmedia_frame frames[])
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amr_settings_t* s = (amr_settings_t*)codec_data->codec_setting;
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pjmedia_codec_amr_pack_setting *setting;
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setting = &s->dec_setting;
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status = pjmedia_codec_amr_parse(pkt, pkt_size, ts, setting, frames,
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if (status != PJ_SUCCESS)
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// CMR is not supported for now.
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/* Check Change Mode Request. */
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//if ((setting->amr_nb && cmr <= 7) || (!setting->amr_nb && cmr <= 8)) {
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// s->enc_mode = cmr;
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#endif /* PJMEDIA_HAS_PASSTROUGH_CODEC_AMR */
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* Initialize and register passthrough codec factory to pjmedia endpoint.
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PJ_DEF(pj_status_t) pjmedia_codec_passthrough_init( pjmedia_endpt *endpt )
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pjmedia_codec_mgr *codec_mgr;
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if (codec_factory.pool != NULL) {
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/* Already initialized. */
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/* Create passthrough codec factory. */
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codec_factory.base.op = &codec_factory_op;
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codec_factory.base.factory_data = NULL;
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codec_factory.endpt = endpt;
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codec_factory.pool = pjmedia_endpt_create_pool(endpt, "Passthrough codecs",
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if (!codec_factory.pool)
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status = pj_mutex_create_simple(codec_factory.pool, "Passthrough codecs",
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&codec_factory.mutex);
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if (status != PJ_SUCCESS)
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/* Get the codec manager. */
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codec_mgr = pjmedia_endpt_get_codec_mgr(endpt);
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status = PJ_EINVALIDOP;
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/* Register format match callback. */
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#if PJMEDIA_HAS_PASSTROUGH_CODEC_AMR
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pj_cstr(&codec_name, "AMR");
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status = pjmedia_sdp_neg_register_fmt_match_cb(
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&pjmedia_codec_amr_match_sdp);
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if (status != PJ_SUCCESS)
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/* Suppress compile warning */
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PJ_UNUSED_ARG(codec_name);
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/* Register codec factory to endpoint. */
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status = pjmedia_codec_mgr_register_factory(codec_mgr,
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&codec_factory.base);
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if (status != PJ_SUCCESS)
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pj_pool_release(codec_factory.pool);
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codec_factory.pool = NULL;
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* Initialize and register passthrough codec factory to pjmedia endpoint.
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PJ_DEF(pj_status_t) pjmedia_codec_passthrough_init2(
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pjmedia_endpt *endpt,
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const pjmedia_codec_passthrough_setting *setting)
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if (codec_factory.pool != NULL) {
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/* Already initialized. */
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if (setting != NULL) {
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/* Enable/disable codecs based on the specified encoding formats */
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for (i = 0; i < PJ_ARRAY_SIZE(codec_desc); ++i) {
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pj_bool_t enabled = PJ_FALSE;
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for (j = 0; j < setting->fmt_cnt && !enabled; ++j) {
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if ((pj_uint32_t)codec_desc[i].fmt_id == setting->fmts[j].id)
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codec_desc[i].enabled = enabled;
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#if PJMEDIA_HAS_PASSTHROUGH_CODEC_ILBC
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/* Update iLBC codec description based on default mode setting. */
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for (i = 0; i < PJ_ARRAY_SIZE(codec_desc); ++i) {
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if (codec_desc[i].enabled &&
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codec_desc[i].fmt_id == PJMEDIA_FORMAT_ILBC)
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codec_desc[i].samples_per_frame =
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(setting->ilbc_mode == 20? 160 : 240);
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codec_desc[i].def_bitrate =
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(setting->ilbc_mode == 20? 15200 : 13333);
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pj_strset2(&codec_desc[i].dec_fmtp.param[0].val,
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(setting->ilbc_mode == 20? "20" : "30"));
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return pjmedia_codec_passthrough_init(endpt);
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* Unregister passthrough codecs factory from pjmedia endpoint.
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PJ_DEF(pj_status_t) pjmedia_codec_passthrough_deinit(void)
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pjmedia_codec_mgr *codec_mgr;
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if (codec_factory.pool == NULL) {
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/* Already deinitialized */
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pj_mutex_lock(codec_factory.mutex);
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/* Get the codec manager. */
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codec_mgr = pjmedia_endpt_get_codec_mgr(codec_factory.endpt);
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pj_pool_release(codec_factory.pool);
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codec_factory.pool = NULL;
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return PJ_EINVALIDOP;
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/* Unregister passthrough codecs factory. */
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status = pjmedia_codec_mgr_unregister_factory(codec_mgr,
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&codec_factory.base);
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pj_mutex_destroy(codec_factory.mutex);
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pj_pool_release(codec_factory.pool);
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codec_factory.pool = NULL;
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/* Re-enable all codecs in the codec_desc. */
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for (i = 0; i < PJ_ARRAY_SIZE(codec_desc); ++i) {
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codec_desc[i].enabled = PJ_TRUE;
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* Check if factory can allocate the specified codec.
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static pj_status_t test_alloc( pjmedia_codec_factory *factory,
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const pjmedia_codec_info *info )
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PJ_UNUSED_ARG(factory);
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/* Type MUST be audio. */
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if (info->type != PJMEDIA_TYPE_AUDIO)
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return PJMEDIA_CODEC_EUNSUP;
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for (i = 0; i < PJ_ARRAY_SIZE(codec_desc); ++i) {
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pj_str_t name = pj_str((char*)codec_desc[i].name);
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if ((pj_stricmp(&info->encoding_name, &name) == 0) &&
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(info->clock_rate == (unsigned)codec_desc[i].clock_rate) &&
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(info->channel_cnt == (unsigned)codec_desc[i].channel_count) &&
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(codec_desc[i].enabled))
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/* Unsupported, or mode is disabled. */
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return PJMEDIA_CODEC_EUNSUP;
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* Generate default attribute.
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static pj_status_t default_attr ( pjmedia_codec_factory *factory,
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const pjmedia_codec_info *id,
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pjmedia_codec_param *attr )
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PJ_ASSERT_RETURN(factory==&codec_factory.base, PJ_EINVAL);
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pj_bzero(attr, sizeof(pjmedia_codec_param));
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for (i = 0; i < PJ_ARRAY_SIZE(codec_desc); ++i) {
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pj_str_t name = pj_str((char*)codec_desc[i].name);
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if ((pj_stricmp(&id->encoding_name, &name) == 0) &&
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(id->clock_rate == (unsigned)codec_desc[i].clock_rate) &&
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(id->channel_cnt == (unsigned)codec_desc[i].channel_count) &&
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(id->pt == (unsigned)codec_desc[i].pt))
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attr->info.pt = (pj_uint8_t)id->pt;
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attr->info.channel_cnt = codec_desc[i].channel_count;
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attr->info.clock_rate = codec_desc[i].clock_rate;
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attr->info.avg_bps = codec_desc[i].def_bitrate;
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attr->info.max_bps = codec_desc[i].max_bitrate;
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attr->info.pcm_bits_per_sample = 16;
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attr->info.frm_ptime = (pj_uint16_t)
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(codec_desc[i].samples_per_frame * 1000 /
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codec_desc[i].channel_count /
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codec_desc[i].clock_rate);
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attr->info.fmt_id = codec_desc[i].fmt_id;
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attr->setting.frm_per_pkt = codec_desc[i].frm_per_pkt;
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attr->setting.plc = codec_desc[i].plc;
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attr->setting.penh= 0;
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attr->setting.vad = codec_desc[i].vad;
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attr->setting.cng = attr->setting.vad;
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attr->setting.dec_fmtp = codec_desc[i].dec_fmtp;
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if (attr->setting.vad == 0) {
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#if PJMEDIA_HAS_PASSTHROUGH_CODEC_G729
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if (id->pt == PJMEDIA_RTP_PT_G729) {
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/* Signal G729 Annex B is being disabled */
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attr->setting.dec_fmtp.cnt = 1;
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pj_strset2(&attr->setting.dec_fmtp.param[0].name, "annexb");
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pj_strset2(&attr->setting.dec_fmtp.param[0].val, "no");
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return PJMEDIA_CODEC_EUNSUP;
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* Enum codecs supported by this factory.
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static pj_status_t enum_codecs( pjmedia_codec_factory *factory,
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pjmedia_codec_info codecs[])
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PJ_UNUSED_ARG(factory);
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PJ_ASSERT_RETURN(codecs && *count > 0, PJ_EINVAL);
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for (i = 0, *count = 0; i < PJ_ARRAY_SIZE(codec_desc) && *count < max; ++i)
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if (!codec_desc[i].enabled)
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pj_bzero(&codecs[*count], sizeof(pjmedia_codec_info));
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codecs[*count].encoding_name = pj_str((char*)codec_desc[i].name);
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codecs[*count].pt = codec_desc[i].pt;
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codecs[*count].type = PJMEDIA_TYPE_AUDIO;
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codecs[*count].clock_rate = codec_desc[i].clock_rate;
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codecs[*count].channel_cnt = codec_desc[i].channel_count;
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* Allocate a new codec instance.
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static pj_status_t alloc_codec( pjmedia_codec_factory *factory,
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const pjmedia_codec_info *id,
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pjmedia_codec **p_codec)
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codec_private_t *codec_data;
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pjmedia_codec *codec;
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PJ_ASSERT_RETURN(factory && id && p_codec, PJ_EINVAL);
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PJ_ASSERT_RETURN(factory == &codec_factory.base, PJ_EINVAL);
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pj_mutex_lock(codec_factory.mutex);
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/* Find codec's index */
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for (i = 0; i < PJ_ARRAY_SIZE(codec_desc); ++i) {
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pj_str_t name = pj_str((char*)codec_desc[i].name);
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if ((pj_stricmp(&id->encoding_name, &name) == 0) &&
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(id->clock_rate == (unsigned)codec_desc[i].clock_rate) &&
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(id->channel_cnt == (unsigned)codec_desc[i].channel_count) &&
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(codec_desc[i].enabled))
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return PJMEDIA_CODEC_EUNSUP;
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/* Create pool for codec instance */
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pool = pjmedia_endpt_create_pool(codec_factory.endpt, "passthroughcodec",
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codec = PJ_POOL_ZALLOC_T(pool, pjmedia_codec);
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codec->op = &codec_op;
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codec->factory = factory;
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codec->codec_data = PJ_POOL_ZALLOC_T(pool, codec_private_t);
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codec_data = (codec_private_t*) codec->codec_data;
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codec_data->pool = pool;
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codec_data->codec_idx = idx;
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pj_mutex_unlock(codec_factory.mutex);
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static pj_status_t dealloc_codec( pjmedia_codec_factory *factory,
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pjmedia_codec *codec )
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codec_private_t *codec_data;
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PJ_ASSERT_RETURN(factory && codec, PJ_EINVAL);
654
PJ_ASSERT_RETURN(factory == &codec_factory.base, PJ_EINVAL);
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/* Close codec, if it's not closed. */
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codec_data = (codec_private_t*) codec->codec_data;
660
pj_pool_release(codec_data->pool);
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static pj_status_t codec_init( pjmedia_codec *codec,
671
PJ_UNUSED_ARG(codec);
679
static pj_status_t codec_open( pjmedia_codec *codec,
680
pjmedia_codec_param *attr )
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codec_private_t *codec_data = (codec_private_t*) codec->codec_data;
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struct codec_desc *desc = &codec_desc[codec_data->codec_idx];
687
pool = codec_data->pool;
689
/* Cache samples per frame value */
690
codec_data->samples_per_frame = desc->samples_per_frame;
692
/* Calculate bitstream size */
693
i = attr->info.avg_bps * codec_data->samples_per_frame;
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j = desc->clock_rate << 3;
695
codec_data->avg_frame_size = (pj_uint16_t)(i / j);
696
if (i % j) ++codec_data->avg_frame_size;
698
#if PJMEDIA_HAS_PASSTHROUGH_CODEC_AMR
699
/* Init AMR settings */
700
if (desc->pt == PJMEDIA_RTP_PT_AMR || desc->pt == PJMEDIA_RTP_PT_AMRWB) {
702
pj_uint8_t octet_align = 0;
705
enc_mode = pjmedia_codec_amr_get_mode(attr->info.avg_bps);
706
pj_assert(enc_mode >= 0 && enc_mode <= 8);
708
for (i = 0; i < attr->setting.dec_fmtp.cnt; ++i) {
709
const pj_str_t STR_FMTP_OCTET_ALIGN = {"octet-align", 11};
711
/* Fetch octet-align setting. It should be fine to fetch only
712
* the decoder, since encoder & decoder must use the same setting
713
* (RFC 4867 section 8.3.1).
715
if (pj_stricmp(&attr->setting.dec_fmtp.param[i].name,
716
&STR_FMTP_OCTET_ALIGN) == 0)
718
octet_align=(pj_uint8_t)
719
(pj_strtoul(&attr->setting.dec_fmtp.param[i].val));
724
for (i = 0; i < attr->setting.enc_fmtp.cnt; ++i) {
725
const pj_str_t STR_FMTP_MODE_SET = {"mode-set", 8};
727
/* mode-set, encoding mode is chosen based on local default mode
729
* - if local default mode is included in the mode-set, use it
730
* - otherwise, find the closest mode to local default mode;
731
* if there are two closest modes, prefer to use the higher
732
* one, e.g: local default mode is 4, the mode-set param
733
* contains '2,3,5,6', then 5 will be chosen.
735
if (pj_stricmp(&attr->setting.enc_fmtp.param[i].name,
736
&STR_FMTP_MODE_SET) == 0)
742
p = pj_strbuf(&attr->setting.enc_fmtp.param[i].val);
743
l = pj_strlen(&attr->setting.enc_fmtp.param[i].val);
746
if ((desc->pt==PJMEDIA_RTP_PT_AMR && *p>='0' && *p<='7') ||
747
(desc->pt==PJMEDIA_RTP_PT_AMRWB && *p>='0' && *p<='8'))
749
pj_int8_t tmp = (pj_int8_t)(*p - '0' - enc_mode);
751
if (PJ_ABS(diff) > PJ_ABS(tmp) ||
752
(PJ_ABS(diff) == PJ_ABS(tmp) && tmp > diff))
755
if (diff == 0) break;
762
return PJMEDIA_CODEC_EFAILED;
764
enc_mode = (pj_int8_t)(enc_mode + diff);
770
s = PJ_POOL_ZALLOC_T(pool, amr_settings_t);
771
codec_data->codec_setting = s;
773
s->enc_mode = enc_mode;
775
return PJMEDIA_CODEC_EINMODE;
777
s->enc_setting.amr_nb = (pj_uint8_t)(desc->pt == PJMEDIA_RTP_PT_AMR);
778
s->enc_setting.octet_aligned = octet_align;
779
s->enc_setting.reorder = PJ_FALSE; /* Note this! passthrough codec
780
doesn't do sensitivity bits
782
s->enc_setting.cmr = 15;
784
s->dec_setting.amr_nb = (pj_uint8_t)(desc->pt == PJMEDIA_RTP_PT_AMR);
785
s->dec_setting.octet_aligned = octet_align;
786
s->dec_setting.reorder = PJ_FALSE; /* Note this! passthrough codec
787
doesn't do sensitivity bits
790
/* Return back bitrate info to application */
791
attr->info.avg_bps = s->enc_setting.amr_nb?
792
pjmedia_codec_amrnb_bitrates[s->enc_mode]:
793
pjmedia_codec_amrwb_bitrates[s->enc_mode];
797
#if PJMEDIA_HAS_PASSTHROUGH_CODEC_ILBC
798
/* Init iLBC settings */
799
if (desc->pt == PJMEDIA_RTP_PT_ILBC)
801
enum { DEFAULT_MODE = 30 };
802
static pj_str_t STR_MODE = {"mode", 4};
803
pj_uint16_t dec_fmtp_mode = DEFAULT_MODE,
804
enc_fmtp_mode = DEFAULT_MODE;
806
/* Get decoder mode */
807
for (i = 0; i < attr->setting.dec_fmtp.cnt; ++i) {
808
if (pj_stricmp(&attr->setting.dec_fmtp.param[i].name, &STR_MODE) == 0)
810
dec_fmtp_mode = (pj_uint16_t)
811
pj_strtoul(&attr->setting.dec_fmtp.param[i].val);
816
/* Decoder mode must be set */
817
PJ_ASSERT_RETURN(dec_fmtp_mode == 20 || dec_fmtp_mode == 30,
818
PJMEDIA_CODEC_EINMODE);
820
/* Get encoder mode */
821
for (i = 0; i < attr->setting.enc_fmtp.cnt; ++i) {
822
if (pj_stricmp(&attr->setting.enc_fmtp.param[i].name, &STR_MODE) == 0)
824
enc_fmtp_mode = (pj_uint16_t)
825
pj_strtoul(&attr->setting.enc_fmtp.param[i].val);
830
PJ_ASSERT_RETURN(enc_fmtp_mode==20 || enc_fmtp_mode==30,
831
PJMEDIA_CODEC_EINMODE);
833
/* Both sides of a bi-directional session MUST use the same "mode" value.
834
* In this point, possible values are only 20 or 30, so when encoder and
835
* decoder modes are not same, just use the default mode, it is 30.
837
if (enc_fmtp_mode != dec_fmtp_mode) {
838
enc_fmtp_mode = dec_fmtp_mode = DEFAULT_MODE;
839
PJ_LOG(4,(pool->obj_name,
840
"Normalized iLBC encoder and decoder modes to %d",
844
/* Update some attributes based on negotiated mode. */
845
attr->info.avg_bps = (dec_fmtp_mode == 30? 13333 : 15200);
846
attr->info.frm_ptime = dec_fmtp_mode;
848
/* Override average frame size */
849
codec_data->avg_frame_size = (dec_fmtp_mode == 30? 50 : 38);
851
/* Override samples per frame */
852
codec_data->samples_per_frame = (dec_fmtp_mode == 30? 240 : 160);
862
static pj_status_t codec_close( pjmedia_codec *codec )
864
PJ_UNUSED_ARG(codec);
871
* Modify codec settings.
873
static pj_status_t codec_modify( pjmedia_codec *codec,
874
const pjmedia_codec_param *attr )
876
/* Not supported yet. */
877
PJ_UNUSED_ARG(codec);
884
* Get frames in the packet.
886
static pj_status_t codec_parse( pjmedia_codec *codec,
889
const pj_timestamp *ts,
891
pjmedia_frame frames[])
893
codec_private_t *codec_data = (codec_private_t*) codec->codec_data;
894
struct codec_desc *desc = &codec_desc[codec_data->codec_idx];
897
PJ_ASSERT_RETURN(frame_cnt, PJ_EINVAL);
899
if (desc->parse != NULL) {
900
return desc->parse(codec_data, pkt, pkt_size, ts, frame_cnt, frames);
903
while (pkt_size >= codec_data->avg_frame_size && count < *frame_cnt) {
904
frames[count].type = PJMEDIA_FRAME_TYPE_AUDIO;
905
frames[count].buf = pkt;
906
frames[count].size = codec_data->avg_frame_size;
907
frames[count].timestamp.u64 = ts->u64 +
908
count * codec_data->samples_per_frame;
910
pkt = (pj_uint8_t*)pkt + codec_data->avg_frame_size;
911
pkt_size -= codec_data->avg_frame_size;
916
if (pkt_size && count < *frame_cnt) {
917
frames[count].type = PJMEDIA_FRAME_TYPE_AUDIO;
918
frames[count].buf = pkt;
919
frames[count].size = pkt_size;
920
frames[count].timestamp.u64 = ts->u64 +
921
count * codec_data->samples_per_frame;
932
static pj_status_t codec_encode( pjmedia_codec *codec,
933
const struct pjmedia_frame *input,
934
unsigned output_buf_len,
935
struct pjmedia_frame *output)
937
codec_private_t *codec_data = (codec_private_t*) codec->codec_data;
938
struct codec_desc *desc = &codec_desc[codec_data->codec_idx];
939
const pjmedia_frame_ext *input_ = (const pjmedia_frame_ext*) input;
941
pj_assert(input && input->type == PJMEDIA_FRAME_TYPE_EXTENDED);
943
if (desc->pack != NULL) {
944
desc->pack(codec_data, input_, output_buf_len, output);
946
if (input_->subframe_cnt == 0) {
950
output->type = PJMEDIA_FRAME_TYPE_NONE;
953
pj_uint8_t *p = output->buf;
955
output->type = PJMEDIA_FRAME_TYPE_AUDIO;
958
for (i = 0; i < input_->subframe_cnt; ++i) {
959
pjmedia_frame_ext_subframe *sf;
962
sf = pjmedia_frame_ext_get_subframe(input_, i);
965
sf_len = (sf->bitlen + 7) >> 3;
967
pj_memcpy(p, sf->data, sf_len);
969
output->size += sf_len;
971
/* If there is SID or DTX frame, break the loop. */
972
if (desc->pt == PJMEDIA_RTP_PT_G729 &&
973
sf_len < codec_data->avg_frame_size)
982
output->timestamp = input->timestamp;
990
static pj_status_t codec_decode( pjmedia_codec *codec,
991
const struct pjmedia_frame *input,
992
unsigned output_buf_len,
993
struct pjmedia_frame *output)
995
codec_private_t *codec_data = (codec_private_t*) codec->codec_data;
996
#if PJMEDIA_HAS_PASSTHROUGH_CODEC_AMR
997
struct codec_desc *desc = &codec_desc[codec_data->codec_idx];
999
pjmedia_frame_ext *output_ = (pjmedia_frame_ext*) output;
1002
PJ_UNUSED_ARG(output_buf_len);
1004
#if PJMEDIA_HAS_PASSTHROUGH_CODEC_AMR
1005
/* Need to rearrange the AMR bitstream, since the bitstream may not be
1006
* started from bit 0 or may need to be reordered from sensitivity order
1007
* into encoder bits order.
1009
if (desc->pt == PJMEDIA_RTP_PT_AMR || desc->pt == PJMEDIA_RTP_PT_AMRWB) {
1010
pjmedia_frame input_;
1011
pjmedia_codec_amr_pack_setting *setting;
1013
setting = &((amr_settings_t*)codec_data->codec_setting)->dec_setting;
1016
pjmedia_codec_amr_predecode(input, setting, &input_);
1018
pjmedia_frame_ext_append_subframe(output_, input_.buf,
1019
(pj_uint16_t)(input_.size << 3),
1020
(pj_uint16_t)codec_data->samples_per_frame);
1021
output->timestamp = input->timestamp;
1027
pjmedia_frame_ext_append_subframe(output_, input->buf,
1028
(pj_uint16_t)(input->size << 3),
1029
(pj_uint16_t)codec_data->samples_per_frame);
1030
output->timestamp = input->timestamp;
1036
* Recover lost frame.
1038
static pj_status_t codec_recover( pjmedia_codec *codec,
1039
unsigned output_buf_len,
1040
struct pjmedia_frame *output)
1042
codec_private_t *codec_data = (codec_private_t*) codec->codec_data;
1043
pjmedia_frame_ext *output_ = (pjmedia_frame_ext*) output;
1045
PJ_UNUSED_ARG(output_buf_len);
1047
pjmedia_frame_ext_append_subframe(output_, NULL, 0,
1048
(pj_uint16_t)codec_data->samples_per_frame);
1053
#endif /* PJMEDIA_HAS_PASSTHROUGH_CODECS */