209 lines
5.3 KiB
C
Executable File
209 lines
5.3 KiB
C
Executable File
/*
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* Copyright (C) 2010-2011 Mamadou Diop.
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*
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* Contact: Mamadou Diop <diopmamadou(at)doubango.org>
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*
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* This file is part of Open Source Doubango Framework.
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*
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* DOUBANGO 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 3 of the License, or
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* (at your option) any later version.
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*
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* DOUBANGO 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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*
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* You should have received a copy of the GNU General Public License
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* along with DOUBANGO.
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*
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*/
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/**@file tdav_codec_gsm.c
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* @brief GSM Full Rate Codec (Based on libgsm)
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*
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* @author Mamadou Diop <diopmamadou(at)doubango.org>
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*
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*/
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#include "tinydav/codecs/gsm/tdav_codec_gsm.h"
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#if HAVE_LIBGSM
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#include "tsk_string.h"
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#include "tsk_memory.h"
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#include "tsk_debug.h"
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#define TDAV_GSM_FRAME_SIZE 33
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/* ============ GSM Plugin interface ================= */
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#define tdav_codec_gsm_sdp_att_get tsk_null
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int tdav_codec_gsm_open(tmedia_codec_t* self)
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{
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tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self;
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if(!gsm->encoder && !(gsm->encoder = gsm_create())) {
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TSK_DEBUG_ERROR("Failed to create GSM encoder");
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return -2;
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}
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if(!gsm->decoder && !(gsm->decoder = gsm_create())) {
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TSK_DEBUG_ERROR("Failed to create GSM decoder");
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return -3;
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}
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return 0;
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}
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int tdav_codec_gsm_close(tmedia_codec_t* self)
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{
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tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self;
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if(gsm->encoder) {
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gsm_destroy(gsm->encoder);
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gsm->encoder = tsk_null;
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}
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if(gsm->decoder) {
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gsm_destroy(gsm->decoder);
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gsm->decoder = tsk_null;
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}
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return 0;
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}
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tsk_size_t tdav_codec_gsm_encode(tmedia_codec_t* self, const void* in_data, tsk_size_t in_size, void** out_data, tsk_size_t* out_max_size)
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{
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tsk_size_t out_size;
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tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self;
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if(!self || !in_data || !in_size || !out_data) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return 0;
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}
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out_size = ((in_size / (TMEDIA_CODEC_PCM_FRAME_SIZE_AUDIO_ENCODING(self) * sizeof(short))) * TDAV_GSM_FRAME_SIZE);
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/* allocate new buffer if needed */
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if(*out_max_size <out_size) {
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if(!(*out_data = tsk_realloc(*out_data, out_size))) {
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TSK_DEBUG_ERROR("Failed to allocate new buffer");
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*out_max_size = 0;
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return 0;
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}
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*out_max_size = out_size;
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}
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gsm_encode(gsm->encoder, (gsm_signal*)in_data, (gsm_byte*)*out_data);
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return out_size;
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}
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tsk_size_t tdav_codec_gsm_decode(tmedia_codec_t* self, const void* in_data, tsk_size_t in_size, void** out_data, tsk_size_t* out_max_size, const tsk_object_t* proto_hdr)
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{
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tsk_size_t out_size;
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int ret;
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tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self;
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if(!self || !in_data || !in_size || !out_data || (in_size % TDAV_GSM_FRAME_SIZE)) {
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TSK_DEBUG_ERROR("Invalid parameter");
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return 0;
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}
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out_size = (in_size / TDAV_GSM_FRAME_SIZE) * (TMEDIA_CODEC_PCM_FRAME_SIZE_AUDIO_DECODING(self) * sizeof(short));
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/* allocate new buffer if needed */
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if(*out_max_size <out_size) {
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if(!(*out_data = tsk_realloc(*out_data, out_size))) {
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TSK_DEBUG_ERROR("Failed to allocate new buffer");
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*out_max_size = 0;
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return 0;
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}
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*out_max_size = out_size;
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}
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ret = gsm_decode(gsm->decoder, (gsm_byte*)in_data, (gsm_signal*)*out_data);
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return out_size;
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}
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tsk_bool_t tdav_codec_gsm_sdp_att_match(const tmedia_codec_t* codec, const char* att_name, const char* att_value)
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{
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/* always match */
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return tsk_true;
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}
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//
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// GSM Plugin definition
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//
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/* constructor */
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static tsk_object_t* tdav_codec_gsm_ctor(tsk_object_t * self, va_list * app)
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{
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tdav_codec_gsm_t *gsm = self;
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if(gsm) {
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/* init base: called by tmedia_codec_create() */
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/* init self */
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}
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return self;
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}
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/* destructor */
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static tsk_object_t* tdav_codec_gsm_dtor(tsk_object_t * self)
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{
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tdav_codec_gsm_t *gsm = self;
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if(gsm) {
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/* deinit base */
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tmedia_codec_audio_deinit(gsm);
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/* deinit self */
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if(gsm->encoder) {
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gsm_destroy(gsm->encoder);
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}
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if(gsm->decoder) {
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gsm_destroy(gsm->decoder);
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}
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}
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return self;
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}
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/* object definition */
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static const tsk_object_def_t tdav_codec_gsm_def_s = {
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sizeof(tdav_codec_gsm_t),
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tdav_codec_gsm_ctor,
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tdav_codec_gsm_dtor,
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tmedia_codec_cmp,
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};
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/* plugin definition*/
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static const tmedia_codec_plugin_def_t tdav_codec_gsm_plugin_def_s = {
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&tdav_codec_gsm_def_s,
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tmedia_audio,
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tmedia_codec_id_gsm,
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"GSM",
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"GSM Full Rate (libgsm)",
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TMEDIA_CODEC_FORMAT_GSM,
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tsk_false,
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8000, // rate
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{ /* audio */
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1, // channels
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0 // ptime @deprecated
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},
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/* video */
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{0},
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tsk_null, // set()
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tdav_codec_gsm_open,
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tdav_codec_gsm_close,
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tdav_codec_gsm_encode,
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tdav_codec_gsm_decode,
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tdav_codec_gsm_sdp_att_match,
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tdav_codec_gsm_sdp_att_get
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};
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const tmedia_codec_plugin_def_t *tdav_codec_gsm_plugin_def_t = &tdav_codec_gsm_plugin_def_s;
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#endif /* HAVE_LIBGSM */
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