diff options
Diffstat (limited to 'tinyDAV/src/codecs/gsm/tdav_codec_gsm.c')
-rw-r--r-- | tinyDAV/src/codecs/gsm/tdav_codec_gsm.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/tinyDAV/src/codecs/gsm/tdav_codec_gsm.c b/tinyDAV/src/codecs/gsm/tdav_codec_gsm.c new file mode 100644 index 0000000..8b5f1bc --- /dev/null +++ b/tinyDAV/src/codecs/gsm/tdav_codec_gsm.c @@ -0,0 +1,209 @@ +/* +* Copyright (C) 2010-2011 Mamadou Diop. +* +* Contact: Mamadou Diop <diopmamadou(at)doubango.org> +* +* This file is part of Open Source Doubango Framework. +* +* DOUBANGO is free software: you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation, either version 3 of the License, or +* (at your option) any later version. +* +* DOUBANGO is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with DOUBANGO. +* +*/ + +/**@file tdav_codec_gsm.c + * @brief GSM Full Rate Codec (Based on libgsm) + * + * @author Mamadou Diop <diopmamadou(at)doubango.org> + * + + */ +#include "tinydav/codecs/gsm/tdav_codec_gsm.h" + +#if HAVE_LIBGSM + +#include "tsk_string.h" +#include "tsk_memory.h" +#include "tsk_debug.h" + +#define TDAV_GSM_FRAME_SIZE 33 + +/* ============ GSM Plugin interface ================= */ + +#define tdav_codec_gsm_sdp_att_get tsk_null + +int tdav_codec_gsm_open(tmedia_codec_t* self) +{ + tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self; + + if(!gsm->encoder && !(gsm->encoder = gsm_create())){ + TSK_DEBUG_ERROR("Failed to create GSM encoder"); + return -2; + } + if(!gsm->decoder && !(gsm->decoder = gsm_create())){ + TSK_DEBUG_ERROR("Failed to create GSM decoder"); + return -3; + } + + return 0; +} + +int tdav_codec_gsm_close(tmedia_codec_t* self) +{ + tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self; + + if(gsm->encoder){ + gsm_destroy(gsm->encoder); + gsm->encoder = tsk_null; + } + if(gsm->decoder){ + gsm_destroy(gsm->decoder); + gsm->decoder = tsk_null; + } + + return 0; +} + +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) +{ + tsk_size_t out_size; + tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self; + + if(!self || !in_data || !in_size || !out_data){ + TSK_DEBUG_ERROR("Invalid parameter"); + return 0; + } + + out_size = ((in_size / (TMEDIA_CODEC_PCM_FRAME_SIZE_AUDIO_ENCODING(self) * sizeof(short))) * TDAV_GSM_FRAME_SIZE); + + /* allocate new buffer if needed */ + if(*out_max_size <out_size){ + if(!(*out_data = tsk_realloc(*out_data, out_size))){ + TSK_DEBUG_ERROR("Failed to allocate new buffer"); + *out_max_size = 0; + return 0; + } + *out_max_size = out_size; + } + + gsm_encode(gsm->encoder, (gsm_signal*)in_data, (gsm_byte*)*out_data); + + return out_size; +} + +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) +{ + tsk_size_t out_size; + int ret; + tdav_codec_gsm_t* gsm = (tdav_codec_gsm_t*)self; + + if(!self || !in_data || !in_size || !out_data || (in_size % TDAV_GSM_FRAME_SIZE)){ + TSK_DEBUG_ERROR("Invalid parameter"); + return 0; + } + + out_size = (in_size / TDAV_GSM_FRAME_SIZE) * (TMEDIA_CODEC_PCM_FRAME_SIZE_AUDIO_DECODING(self) * sizeof(short)); + + /* allocate new buffer if needed */ + if(*out_max_size <out_size){ + if(!(*out_data = tsk_realloc(*out_data, out_size))){ + TSK_DEBUG_ERROR("Failed to allocate new buffer"); + *out_max_size = 0; + return 0; + } + *out_max_size = out_size; + } + + ret = gsm_decode(gsm->decoder, (gsm_byte*)in_data, (gsm_signal*)*out_data); + + return out_size; +} + +tsk_bool_t tdav_codec_gsm_sdp_att_match(const tmedia_codec_t* codec, const char* att_name, const char* att_value) +{ /* always match */ + return tsk_true; +} + + +// +// GSM Plugin definition +// + +/* constructor */ +static tsk_object_t* tdav_codec_gsm_ctor(tsk_object_t * self, va_list * app) +{ + tdav_codec_gsm_t *gsm = self; + if(gsm){ + /* init base: called by tmedia_codec_create() */ + /* init self */ + } + return self; +} +/* destructor */ +static tsk_object_t* tdav_codec_gsm_dtor(tsk_object_t * self) +{ + tdav_codec_gsm_t *gsm = self; + if(gsm){ + /* deinit base */ + tmedia_codec_audio_deinit(gsm); + /* deinit self */ + if(gsm->encoder){ + gsm_destroy(gsm->encoder); + } + if(gsm->decoder){ + gsm_destroy(gsm->decoder); + } + } + + return self; +} +/* object definition */ +static const tsk_object_def_t tdav_codec_gsm_def_s = +{ + sizeof(tdav_codec_gsm_t), + tdav_codec_gsm_ctor, + tdav_codec_gsm_dtor, + tmedia_codec_cmp, +}; +/* plugin definition*/ +static const tmedia_codec_plugin_def_t tdav_codec_gsm_plugin_def_s = +{ + &tdav_codec_gsm_def_s, + + tmedia_audio, + tmedia_codec_id_gsm, + "GSM", + "GSM Full Rate (libgsm)", + TMEDIA_CODEC_FORMAT_GSM, + tsk_false, + 8000, // rate + + { /* audio */ + 1, // channels + 0 // ptime @deprecated + }, + + /* video */ + {0}, + + tsk_null, // set() + tdav_codec_gsm_open, + tdav_codec_gsm_close, + tdav_codec_gsm_encode, + tdav_codec_gsm_decode, + tdav_codec_gsm_sdp_att_match, + tdav_codec_gsm_sdp_att_get +}; +const tmedia_codec_plugin_def_t *tdav_codec_gsm_plugin_def_t = &tdav_codec_gsm_plugin_def_s; + + +#endif /* HAVE_LIBGSM */ |