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-rw-r--r--tinyDAV/src/codecs/gsm/tdav_codec_gsm.c208
1 files changed, 208 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..56748da
--- /dev/null
+++ b/tinyDAV/src/codecs/gsm/tdav_codec_gsm.c
@@ -0,0 +1,208 @@
+/*
+* Copyright (C) 2009-2010 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>
+ *
+ * @date Created: Sat Nov 8 16:54:58 2009 mdiop
+ */
+#include "tinydav/codecs/gsm/tdav_codec_gsm.h"
+
+#if HAVE_LIBGSM
+
+#include "tsk_memory.h"
+#include "tsk_debug.h"
+
+#define TDAV_GSM_FRAME_SIZE 33
+
+/* ============ GSM Plugin interface ================= */
+
+#define tdav_codec_gsm_fmtp_get tsk_null
+#define tdav_codec_gsm_fmtp_set 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(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(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_fmtp_match(const tmedia_codec_t* codec, const char* fmtp)
+{ /* 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,
+ "GSM",
+ "GSM Full Rate",
+ TMEDIA_CODEC_FORMAT_GSM,
+ tsk_false,
+ 8000, // rate
+
+ { /* audio */
+ 1, // channels
+ 20 // ptime
+ },
+
+ /* video */
+ {0},
+
+ tdav_codec_gsm_open,
+ tdav_codec_gsm_close,
+ tdav_codec_gsm_encode,
+ tdav_codec_gsm_decode,
+ tdav_codec_gsm_fmtp_match,
+ tdav_codec_gsm_fmtp_get,
+ tdav_codec_gsm_fmtp_set
+};
+const tmedia_codec_plugin_def_t *tdav_codec_gsm_plugin_def_t = &tdav_codec_gsm_plugin_def_s;
+
+
+#endif /* HAVE_LIBGSM */
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