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/* $Id: speex_codec.c 3664 2011-07-19 03:42:28Z nanang $ */
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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/speex.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 <speex/speex.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_SPEEX_CODEC != 0
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#if defined(PJMEDIA_HAS_SPEEX_CODEC) && PJMEDIA_HAS_SPEEX_CODEC!=0
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#define THIS_FILE "speex_codec.c"
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/* Prototypes for Speex factory */
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static pj_status_t spx_test_alloc( pjmedia_codec_factory *factory,
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const pjmedia_codec_info *id );
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static pj_status_t spx_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 spx_enum_codecs( pjmedia_codec_factory *factory,
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pjmedia_codec_info codecs[]);
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static pj_status_t spx_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 spx_dealloc_codec( pjmedia_codec_factory *factory,
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pjmedia_codec *codec );
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/* Prototypes for Speex implementation. */
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static pj_status_t spx_codec_init( pjmedia_codec *codec,
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static pj_status_t spx_codec_open( pjmedia_codec *codec,
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pjmedia_codec_param *attr );
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static pj_status_t spx_codec_close( pjmedia_codec *codec );
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static pj_status_t spx_codec_modify(pjmedia_codec *codec,
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const pjmedia_codec_param *attr );
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static pj_status_t spx_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 spx_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 spx_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 spx_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 Speex codec operations. */
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static pjmedia_codec_op spx_op =
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/* Definition for Speex codec factory operations. */
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static pjmedia_codec_factory_op spx_factory_op =
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&pjmedia_codec_speex_deinit
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/* Index to Speex parameter. */
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PARAM_NB, /* Index for narrowband parameter. */
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PARAM_WB, /* Index for wideband parameter. */
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PARAM_UWB, /* Index for ultra-wideband parameter */
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/* Speex default parameter */
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int enabled; /* Is this mode enabled? */
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const SpeexMode *mode; /* Speex mode. */
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int pt; /* Payload type. */
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unsigned clock_rate; /* Default sampling rate to be used.*/
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int quality; /* Default encoder quality. */
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int complexity; /* Default encoder complexity. */
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int samples_per_frame; /* Samples per frame. */
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int framesize; /* Frame size for current mode. */
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int bitrate; /* Bit rate for current mode. */
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int max_bitrate; /* Max bit rate for current mode. */
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static struct spx_factory
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pjmedia_codec_factory base;
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pjmedia_endpt *endpt;
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pjmedia_codec codec_list;
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struct speex_param speex_param[3];
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/* Speex codec private data. */
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int param_id; /**< Index to speex param. */
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void *enc; /**< Encoder state. */
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SpeexBits enc_bits; /**< Encoder bits. */
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void *dec; /**< Decoder state. */
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SpeexBits dec_bits; /**< Decoder bits. */
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* Get codec bitrate and frame size.
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static pj_status_t get_speex_info( struct speex_param *p )
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/* Create temporary encoder */
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state = speex_encoder_init(p->mode);
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return PJMEDIA_CODEC_EFAILED;
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/* Set the quality */
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if (p->quality != -1)
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speex_encoder_ctl(state, SPEEX_SET_QUALITY, &p->quality);
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speex_encoder_ctl(state, SPEEX_SET_SAMPLING_RATE, &p->clock_rate);
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/* VAD off to have max bitrate */
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speex_encoder_ctl(state, SPEEX_SET_VAD, &tmp);
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if (p->complexity != -1)
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speex_encoder_ctl(state, SPEEX_SET_COMPLEXITY, &p->complexity);
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/* Now get the frame size */
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speex_encoder_ctl(state, SPEEX_GET_FRAME_SIZE, &p->samples_per_frame);
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/* Now get the average bitrate */
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speex_encoder_ctl(state, SPEEX_GET_BITRATE, &p->bitrate);
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/* Calculate framesize. */
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p->framesize = p->bitrate * 20 / 1000;
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/* Now get the maximum bitrate by using maximum quality (=10) */
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speex_encoder_ctl(state, SPEEX_SET_QUALITY, &tmp);
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speex_encoder_ctl(state, SPEEX_GET_BITRATE, &p->max_bitrate);
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/* Destroy encoder. */
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speex_encoder_destroy(state);
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* Initialize and register Speex codec factory to pjmedia endpoint.
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PJ_DEF(pj_status_t) pjmedia_codec_speex_init( pjmedia_endpt *endpt,
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pjmedia_codec_mgr *codec_mgr;
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if (spx_factory.pool != NULL) {
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/* Already initialized. */
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if (quality < 0) quality = PJMEDIA_CODEC_SPEEX_DEFAULT_QUALITY;
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if (complexity < 0) complexity = PJMEDIA_CODEC_SPEEX_DEFAULT_COMPLEXITY;
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/* Validate quality & complexity */
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PJ_ASSERT_RETURN(quality >= 0 && quality <= 10, PJ_EINVAL);
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PJ_ASSERT_RETURN(complexity >= 1 && complexity <= 10, PJ_EINVAL);
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/* Create Speex codec factory. */
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spx_factory.base.op = &spx_factory_op;
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spx_factory.base.factory_data = NULL;
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spx_factory.endpt = endpt;
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spx_factory.pool = pjmedia_endpt_create_pool(endpt, "speex",
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if (!spx_factory.pool)
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pj_list_init(&spx_factory.codec_list);
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status = pj_mutex_create_simple(spx_factory.pool, "speex",
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if (status != PJ_SUCCESS)
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/* Initialize default Speex parameter. */
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spx_factory.speex_param[PARAM_NB].enabled =
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((options & PJMEDIA_SPEEX_NO_NB) == 0);
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spx_factory.speex_param[PARAM_NB].pt = PJMEDIA_RTP_PT_SPEEX_NB;
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spx_factory.speex_param[PARAM_NB].mode = speex_lib_get_mode(SPEEX_MODEID_NB);
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spx_factory.speex_param[PARAM_NB].clock_rate = 8000;
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spx_factory.speex_param[PARAM_NB].quality = quality;
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spx_factory.speex_param[PARAM_NB].complexity = complexity;
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spx_factory.speex_param[PARAM_WB].enabled =
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((options & PJMEDIA_SPEEX_NO_WB) == 0);
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spx_factory.speex_param[PARAM_WB].pt = PJMEDIA_RTP_PT_SPEEX_WB;
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spx_factory.speex_param[PARAM_WB].mode = speex_lib_get_mode(SPEEX_MODEID_WB);
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spx_factory.speex_param[PARAM_WB].clock_rate = 16000;
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spx_factory.speex_param[PARAM_WB].quality = quality;
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spx_factory.speex_param[PARAM_WB].complexity = complexity;
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spx_factory.speex_param[PARAM_UWB].enabled =
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((options & PJMEDIA_SPEEX_NO_UWB) == 0);
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spx_factory.speex_param[PARAM_UWB].pt = PJMEDIA_RTP_PT_SPEEX_UWB;
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spx_factory.speex_param[PARAM_UWB].mode = speex_lib_get_mode(SPEEX_MODEID_UWB);
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spx_factory.speex_param[PARAM_UWB].clock_rate = 32000;
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spx_factory.speex_param[PARAM_UWB].quality = quality;
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spx_factory.speex_param[PARAM_UWB].complexity = complexity;
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/* Somehow quality <=4 is broken in linux. */
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if (quality <= 4 && quality >= 0) {
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PJ_LOG(5,(THIS_FILE, "Adjusting quality to 5 for uwb"));
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spx_factory.speex_param[PARAM_UWB].quality = 5;
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/* Get codec framesize and avg bitrate for each mode. */
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for (i=0; i<PJ_ARRAY_SIZE(spx_factory.speex_param); ++i) {
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status = get_speex_info(&spx_factory.speex_param[i]);
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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 codec factory to endpoint. */
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status = pjmedia_codec_mgr_register_factory(codec_mgr,
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if (status != PJ_SUCCESS)
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pj_pool_release(spx_factory.pool);
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spx_factory.pool = NULL;
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* Initialize with default settings.
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PJ_DEF(pj_status_t) pjmedia_codec_speex_init_default(pjmedia_endpt *endpt)
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return pjmedia_codec_speex_init(endpt, 0, -1, -1);
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* Change the settings of Speex codec.
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PJ_DEF(pj_status_t) pjmedia_codec_speex_set_param(unsigned clock_rate,
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if (quality < 0) quality = PJMEDIA_CODEC_SPEEX_DEFAULT_QUALITY;
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if (complexity < 0) complexity = PJMEDIA_CODEC_SPEEX_DEFAULT_COMPLEXITY;
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/* Validate quality & complexity */
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PJ_ASSERT_RETURN(quality >= 0 && quality <= 10, PJ_EINVAL);
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PJ_ASSERT_RETURN(complexity >= 1 && complexity <= 10, PJ_EINVAL);
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/* Apply the settings */
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for (i=0; i<PJ_ARRAY_SIZE(spx_factory.speex_param); ++i) {
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if (spx_factory.speex_param[i].clock_rate == clock_rate) {
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spx_factory.speex_param[i].quality = quality;
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spx_factory.speex_param[i].complexity = complexity;
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/* Somehow quality<=4 is broken in linux. */
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if (i == PARAM_UWB && quality <= 4 && quality >= 0) {
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PJ_LOG(5,(THIS_FILE, "Adjusting quality to 5 for uwb"));
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spx_factory.speex_param[PARAM_UWB].quality = 5;
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status = get_speex_info(&spx_factory.speex_param[i]);
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* Unregister Speex codec factory from pjmedia endpoint and deinitialize
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* the Speex codec library.
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PJ_DEF(pj_status_t) pjmedia_codec_speex_deinit(void)
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pjmedia_codec_mgr *codec_mgr;
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if (spx_factory.pool == NULL) {
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/* Already deinitialized */
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pj_mutex_lock(spx_factory.mutex);
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/* We don't want to deinit if there's outstanding codec. */
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/* This is silly, as we'll always have codec in the list if
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we ever allocate a codec! A better behavior maybe is to
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deallocate all codecs in the list.
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if (!pj_list_empty(&spx_factory.codec_list)) {
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pj_mutex_unlock(spx_factory.mutex);
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/* Get the codec manager. */
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codec_mgr = pjmedia_endpt_get_codec_mgr(spx_factory.endpt);
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pj_pool_release(spx_factory.pool);
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spx_factory.pool = NULL;
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return PJ_EINVALIDOP;
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/* Unregister Speex codec factory. */
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status = pjmedia_codec_mgr_unregister_factory(codec_mgr,
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pj_mutex_destroy(spx_factory.mutex);
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pj_pool_release(spx_factory.pool);
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spx_factory.pool = NULL;
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* Check if factory can allocate the specified codec.
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static pj_status_t spx_test_alloc( pjmedia_codec_factory *factory,
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const pjmedia_codec_info *info )
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const pj_str_t speex_tag = { "speex", 5};
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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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/* Check encoding name. */
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if (pj_stricmp(&info->encoding_name, &speex_tag) != 0)
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return PJMEDIA_CODEC_EUNSUP;
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/* Check clock-rate */
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for (i=0; i<PJ_ARRAY_SIZE(spx_factory.speex_param); ++i) {
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if (info->clock_rate == spx_factory.speex_param[i].clock_rate) {
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/* Okay, let's Speex! */
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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 spx_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==&spx_factory.base, PJ_EINVAL);
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pj_bzero(attr, sizeof(pjmedia_codec_param));
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attr->info.pt = (pj_uint8_t)id->pt;
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attr->info.channel_cnt = 1;
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if (id->clock_rate <= 8000) {
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attr->info.clock_rate = spx_factory.speex_param[PARAM_NB].clock_rate;
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attr->info.avg_bps = spx_factory.speex_param[PARAM_NB].bitrate;
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attr->info.max_bps = spx_factory.speex_param[PARAM_NB].max_bitrate;
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} else if (id->clock_rate <= 16000) {
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attr->info.clock_rate = spx_factory.speex_param[PARAM_WB].clock_rate;
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attr->info.avg_bps = spx_factory.speex_param[PARAM_WB].bitrate;
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attr->info.max_bps = spx_factory.speex_param[PARAM_WB].max_bitrate;
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/* Wow.. somebody is doing ultra-wideband. Cool...! */
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attr->info.clock_rate = spx_factory.speex_param[PARAM_UWB].clock_rate;
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attr->info.avg_bps = spx_factory.speex_param[PARAM_UWB].bitrate;
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attr->info.max_bps = spx_factory.speex_param[PARAM_UWB].max_bitrate;
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attr->info.pcm_bits_per_sample = 16;
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attr->info.frm_ptime = 20;
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attr->info.pt = (pj_uint8_t)id->pt;
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attr->setting.frm_per_pkt = 1;
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attr->setting.cng = 1;
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attr->setting.plc = 1;
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attr->setting.penh =1 ;
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attr->setting.vad = 1;
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* Enum codecs supported by this factory (i.e. only Speex!).
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static pj_status_t spx_enum_codecs(pjmedia_codec_factory *factory,
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pjmedia_codec_info codecs[])
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int i; /* Must be signed */
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PJ_UNUSED_ARG(factory);
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PJ_ASSERT_RETURN(codecs && *count > 0, PJ_EINVAL);
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* We return three codecs here, and in this order:
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* - ultra-wideband, wideband, and narrowband.
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for (i=PJ_ARRAY_SIZE(spx_factory.speex_param)-1; i>=0 && *count<max; --i) {
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if (!spx_factory.speex_param[i].enabled)
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pj_bzero(&codecs[*count], sizeof(pjmedia_codec_info));
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codecs[*count].encoding_name = pj_str("speex");
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codecs[*count].pt = spx_factory.speex_param[i].pt;
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codecs[*count].type = PJMEDIA_TYPE_AUDIO;
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codecs[*count].clock_rate = spx_factory.speex_param[i].clock_rate;
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codecs[*count].channel_cnt = 1;
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* Allocate a new Speex codec instance.
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static pj_status_t spx_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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pjmedia_codec *codec;
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struct spx_private *spx;
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PJ_ASSERT_RETURN(factory && id && p_codec, PJ_EINVAL);
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PJ_ASSERT_RETURN(factory == &spx_factory.base, PJ_EINVAL);
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pj_mutex_lock(spx_factory.mutex);
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/* Get free nodes, if any. */
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if (!pj_list_empty(&spx_factory.codec_list)) {
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codec = spx_factory.codec_list.next;
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pj_list_erase(codec);
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codec = PJ_POOL_ZALLOC_T(spx_factory.pool, pjmedia_codec);
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PJ_ASSERT_RETURN(codec != NULL, PJ_ENOMEM);
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codec->factory = factory;
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codec->codec_data = pj_pool_alloc(spx_factory.pool,
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sizeof(struct spx_private));
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pj_mutex_unlock(spx_factory.mutex);
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spx = (struct spx_private*) codec->codec_data;
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if (id->clock_rate <= 8000)
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spx->param_id = PARAM_NB;
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else if (id->clock_rate <= 16000)
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spx->param_id = PARAM_WB;
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spx->param_id = PARAM_UWB;
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static pj_status_t spx_dealloc_codec( pjmedia_codec_factory *factory,
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pjmedia_codec *codec )
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struct spx_private *spx;
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PJ_ASSERT_RETURN(factory && codec, PJ_EINVAL);
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PJ_ASSERT_RETURN(factory == &spx_factory.base, PJ_EINVAL);
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/* Close codec, if it's not closed. */
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spx = (struct spx_private*) codec->codec_data;
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if (spx->enc != NULL || spx->dec != NULL) {
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spx_codec_close(codec);
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/* Put in the free list. */
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pj_mutex_lock(spx_factory.mutex);
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pj_list_push_front(&spx_factory.codec_list, codec);
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pj_mutex_unlock(spx_factory.mutex);
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static pj_status_t spx_codec_init( pjmedia_codec *codec,
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PJ_UNUSED_ARG(codec);
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static pj_status_t spx_codec_open( pjmedia_codec *codec,
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pjmedia_codec_param *attr )
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struct spx_private *spx;
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spx = (struct spx_private*) codec->codec_data;
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* Create and initialize encoder.
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spx->enc = speex_encoder_init(spx_factory.speex_param[id].mode);
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return PJMEDIA_CODEC_EFAILED;
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speex_bits_init(&spx->enc_bits);
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if (spx_factory.speex_param[id].quality != -1) {
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speex_encoder_ctl(spx->enc, SPEEX_SET_QUALITY,
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&spx_factory.speex_param[id].quality);
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tmp = attr->info.clock_rate;
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speex_encoder_ctl(spx->enc, SPEEX_SET_SAMPLING_RATE,
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&spx_factory.speex_param[id].clock_rate);
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tmp = (attr->setting.vad != 0);
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speex_encoder_ctl(spx->enc, SPEEX_SET_VAD, &tmp);
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speex_encoder_ctl(spx->enc, SPEEX_SET_DTX, &tmp);
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if (spx_factory.speex_param[id].complexity != -1) {
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speex_encoder_ctl(spx->enc, SPEEX_SET_COMPLEXITY,
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&spx_factory.speex_param[id].complexity);
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* Create and initialize decoder.
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spx->dec = speex_decoder_init(spx_factory.speex_param[id].mode);
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spx_codec_close(codec);
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return PJMEDIA_CODEC_EFAILED;
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speex_bits_init(&spx->dec_bits);
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speex_decoder_ctl(spx->dec, SPEEX_SET_SAMPLING_RATE,
651
&spx_factory.speex_param[id].clock_rate);
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tmp = attr->setting.penh;
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speex_decoder_ctl(spx->dec, SPEEX_SET_ENH, &tmp);
663
static pj_status_t spx_codec_close( pjmedia_codec *codec )
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struct spx_private *spx;
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spx = (struct spx_private*) codec->codec_data;
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speex_encoder_destroy( spx->enc );
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speex_bits_destroy( &spx->enc_bits );
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/* Destroy decoder */
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speex_decoder_destroy( spx->dec);
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speex_bits_destroy( &spx->dec_bits );
688
* Modify codec settings.
690
static pj_status_t spx_codec_modify(pjmedia_codec *codec,
691
const pjmedia_codec_param *attr )
693
struct spx_private *spx;
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spx = (struct spx_private*) codec->codec_data;
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tmp = (attr->setting.vad != 0);
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speex_encoder_ctl(spx->enc, SPEEX_SET_VAD, &tmp);
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speex_encoder_ctl(spx->enc, SPEEX_SET_DTX, &tmp);
704
tmp = attr->setting.penh;
705
speex_decoder_ctl(spx->dec, SPEEX_SET_ENH, &tmp);
711
# define TRACE__(args) PJ_LOG(5,args)
713
# define TRACE__(args)
717
#define THIS_FUNC "speex_get_next_frame"
719
#define NB_SUBMODES 16
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#define NB_SUBMODE_BITS 4
722
#define SB_SUBMODES 8
723
#define SB_SUBMODE_BITS 3
725
/* This function will iterate frames & submodes in the Speex bits.
726
* Returns 0 if a frame found, otherwise returns -1.
728
int speex_get_next_frame(SpeexBits *bits)
730
static const int inband_skip_table[NB_SUBMODES] =
731
{1, 1, 4, 4, 4, 4, 4, 4, 8, 8, 16, 16, 32, 32, 64, 64 };
732
static const int wb_skip_table[SB_SUBMODES] =
733
{SB_SUBMODE_BITS+1, 36, 112, 192, 352, -1, -1, -1};
736
unsigned nb_count = 0;
738
while (speex_bits_remaining(bits) >= 5) {
739
unsigned wb_count = 0;
740
unsigned bit_ptr = bits->bitPtr;
741
unsigned char_ptr = bits->charPtr;
744
while ((speex_bits_remaining(bits) >= 4)
745
&& speex_bits_unpack_unsigned(bits, 1))
749
submode = speex_bits_unpack_unsigned(bits, 3);
750
advance = wb_skip_table[submode];
752
TRACE__((THIS_FUNC, "Invalid mode encountered. "
753
"The stream is corrupted."));
756
TRACE__((THIS_FUNC, "WB layer skipped: %d bits", advance));
757
advance -= (SB_SUBMODE_BITS+1);
758
speex_bits_advance(bits, advance);
760
bit_ptr = bits->bitPtr;
761
char_ptr = bits->charPtr;
763
/* Consecutive subband frames may not exceed 2 frames */
768
/* End of bits, return the frame */
769
if (speex_bits_remaining(bits) < 4) {
770
TRACE__((THIS_FUNC, "End of stream"));
774
/* Stop iteration, return the frame */
776
bits->bitPtr = bit_ptr;
777
bits->charPtr = char_ptr;
781
/* Get control bits */
782
submode = speex_bits_unpack_unsigned(bits, 4);
783
TRACE__((THIS_FUNC, "Control bits: %d at %d",
784
submode, bits->charPtr*8+bits->bitPtr));
787
TRACE__((THIS_FUNC, "Found submode: terminator"));
789
} else if (submode == 14) {
790
/* in-band signal; next 4 bits contain signal id */
791
submode = speex_bits_unpack_unsigned(bits, 4);
792
TRACE__((THIS_FUNC, "Found submode: in-band %d bits",
793
inband_skip_table[submode]));
794
speex_bits_advance(bits, inband_skip_table[submode]);
795
} else if (submode == 13) {
796
/* user in-band; next 5 bits contain msg len */
797
submode = speex_bits_unpack_unsigned(bits, 5);
798
TRACE__((THIS_FUNC, "Found submode: user-band %d bytes", submode));
799
speex_bits_advance(bits, submode * 8);
800
} else if (submode > 8) {
801
TRACE__((THIS_FUNC, "Unknown sub-mode %d", submode));
805
unsigned int advance = submode;
806
speex_mode_query(&speex_nb_mode, SPEEX_SUBMODE_BITS_PER_FRAME, &advance);
808
TRACE__((THIS_FUNC, "Invalid mode encountered. "
809
"The stream is corrupted."));
812
TRACE__((THIS_FUNC, "Submode %d: %d bits", submode, advance));
813
advance -= (NB_SUBMODE_BITS+1);
814
speex_bits_advance(bits, advance);
825
* Get frames in the packet.
827
static pj_status_t spx_codec_parse( pjmedia_codec *codec,
830
const pj_timestamp *ts,
832
pjmedia_frame frames[])
834
struct spx_private *spx = (struct spx_private*) codec->codec_data;
835
unsigned samples_per_frame;
840
samples_per_frame=spx_factory.speex_param[spx->param_id].samples_per_frame;
842
/* Copy the data into the speex bit-stream */
843
speex_bits_read_from(&spx->dec_bits, (char*)pkt, pkt_size);
845
while (speex_get_next_frame(&spx->dec_bits) == 0 &&
846
spx->dec_bits.charPtr != char_ptr)
848
frames[count].buf = (char*)pkt + char_ptr;
849
/* Bit info contains start bit offset of the frame */
850
frames[count].bit_info = bit_ptr;
851
frames[count].type = PJMEDIA_FRAME_TYPE_AUDIO;
852
frames[count].timestamp.u64 = ts->u64 + count * samples_per_frame;
853
frames[count].size = spx->dec_bits.charPtr - char_ptr;
854
if (spx->dec_bits.bitPtr)
855
++frames[count].size;
857
bit_ptr = spx->dec_bits.bitPtr;
858
char_ptr = spx->dec_bits.charPtr;
871
static pj_status_t spx_codec_encode( pjmedia_codec *codec,
872
const struct pjmedia_frame *input,
873
unsigned output_buf_len,
874
struct pjmedia_frame *output)
876
struct spx_private *spx;
877
unsigned samples_per_frame;
879
spx_int16_t *pcm_in = (spx_int16_t*)input->buf;
882
spx = (struct spx_private*) codec->codec_data;
884
if (input->type != PJMEDIA_FRAME_TYPE_AUDIO) {
887
output->timestamp = input->timestamp;
888
output->type = input->type;
892
nsamples = input->size >> 1;
893
samples_per_frame=spx_factory.speex_param[spx->param_id].samples_per_frame;
895
PJ_ASSERT_RETURN(nsamples % samples_per_frame == 0,
896
PJMEDIA_CODEC_EPCMFRMINLEN);
898
/* Flush all the bits in the struct so we can encode a new frame */
899
speex_bits_reset(&spx->enc_bits);
901
/* Encode the frames */
902
while (nsamples >= samples_per_frame) {
903
tx += speex_encode_int(spx->enc, pcm_in, &spx->enc_bits);
904
pcm_in += samples_per_frame;
905
nsamples -= samples_per_frame;
908
/* Check if we need not to transmit the frame (DTX) */
912
output->timestamp.u64 = input->timestamp.u64;
913
output->type = PJMEDIA_FRAME_TYPE_NONE;
918
pj_assert(speex_bits_nbytes(&spx->enc_bits) <= (int)output_buf_len);
920
/* Copy the bits to an array of char that can be written */
921
output->size = speex_bits_write(&spx->enc_bits,
922
(char*)output->buf, output_buf_len);
923
output->type = PJMEDIA_FRAME_TYPE_AUDIO;
924
output->timestamp = input->timestamp;
932
static pj_status_t spx_codec_decode( pjmedia_codec *codec,
933
const struct pjmedia_frame *input,
934
unsigned output_buf_len,
935
struct pjmedia_frame *output)
937
struct spx_private *spx;
938
unsigned samples_per_frame;
940
spx = (struct spx_private*) codec->codec_data;
941
samples_per_frame=spx_factory.speex_param[spx->param_id].samples_per_frame;
943
PJ_ASSERT_RETURN(output_buf_len >= samples_per_frame << 1,
944
PJMEDIA_CODEC_EPCMTOOSHORT);
946
if (input->type != PJMEDIA_FRAME_TYPE_AUDIO) {
947
pjmedia_zero_samples((pj_int16_t*)output->buf, samples_per_frame);
948
output->size = samples_per_frame << 1;
949
output->timestamp.u64 = input->timestamp.u64;
950
output->type = PJMEDIA_FRAME_TYPE_AUDIO;
954
/* Copy the data into the bit-stream struct */
955
speex_bits_read_from(&spx->dec_bits, (char*)input->buf, input->size);
957
/* Set Speex dec_bits pointer to the start bit of the frame */
958
speex_bits_advance(&spx->dec_bits, input->bit_info);
960
/* Decode the data */
961
speex_decode_int(spx->dec, &spx->dec_bits, (spx_int16_t*)output->buf);
963
output->type = PJMEDIA_FRAME_TYPE_AUDIO;
964
output->size = samples_per_frame << 1;
965
output->timestamp.u64 = input->timestamp.u64;
971
* Recover lost frame.
973
static pj_status_t spx_codec_recover(pjmedia_codec *codec,
974
unsigned output_buf_len,
975
struct pjmedia_frame *output)
977
struct spx_private *spx;
980
/* output_buf_len is unreferenced when building in Release mode */
981
PJ_UNUSED_ARG(output_buf_len);
983
spx = (struct spx_private*) codec->codec_data;
985
count = spx_factory.speex_param[spx->param_id].clock_rate * 20 / 1000;
986
pj_assert(count <= output_buf_len/2);
988
/* Recover packet loss */
989
speex_decode_int(spx->dec, NULL, (spx_int16_t*) output->buf);
991
output->size = count * 2;
997
#endif /* PJMEDIA_HAS_SPEEX_CODEC */