/** Create demo synthesizer channel derived from engine channel base */
static mrcp_engine_channel_t* mrcp_swift_engine_channel_create(mrcp_resource_engine_t *engine, apr_pool_t *pool)
{
swift_engine *synth_engine = engine->obj;
mrcp_swift_channel_t *synth_channel;
mrcp_engine_channel_t *channel;
swift_params *params;
swift_port *port;
mpf_codec_descriptor_t *codec_descriptor;
codec_descriptor = apr_palloc(pool,sizeof(mpf_codec_descriptor_t));
mpf_codec_descriptor_init(codec_descriptor);
codec_descriptor->channel_count = 1;
codec_descriptor->payload_type = 96;
apt_string_set(&codec_descriptor->name,"L16");
codec_descriptor->sampling_rate = 8000;
params = swift_params_new(NULL);
swift_params_set_string(params, "audio/encoding", "pcm16");
swift_params_set_int(params, "audio/sampling-rate", codec_descriptor->sampling_rate);
/* open swift port */
apt_log(APT_LOG_MARK,APT_PRIO_INFO,"Open Swift Port");
if((port = swift_port_open(synth_engine,params)) == NULL) {
apt_log(APT_LOG_MARK,APT_PRIO_WARNING,"Failed to Open Swift Port");
return NULL;
}
/* create swift synth channel */
synth_channel = apr_palloc(pool,sizeof(mrcp_swift_channel_t));
synth_channel->speak_request = NULL;
synth_channel->stop_response = NULL;
synth_channel->paused = FALSE;
synth_channel->channel = NULL;
synth_channel->port = port;
synth_channel->tts_stream = 0;
/* create engine channel base */
channel = mrcp_engine_source_channel_create(
engine, /* resource engine */
&channel_vtable, /* virtual methods table of engine channel */
&audio_stream_vtable, /* virtual methods table of audio stream */
synth_channel, /* object to associate */
codec_descriptor, /* codec descriptor might be NULL by default */
pool); /* pool to allocate memory from */
if(!channel) {
swift_port_close(port);
synth_channel->port = NULL;
return NULL;
}
synth_channel->audio_buffer = mpf_buffer_create(pool);
/* set swift_write_audio as a callback, with the output file as its param */
swift_port_set_callback(port, &mrcp_swift_write_audio, SWIFT_EVENT_AUDIO | SWIFT_EVENT_END, synth_channel);
synth_channel->channel = channel;
return channel;
}
mpf_codec_descriptor_t* mpf_codec_lpcm_descriptor_create(apr_uint16_t sampling_rate, apr_byte_t channel_count, apr_pool_t *pool)
{
mpf_codec_descriptor_t *descriptor = apr_palloc(pool,sizeof(mpf_codec_descriptor_t));
mpf_codec_descriptor_init(descriptor);
descriptor->payload_type = 96;
descriptor->name.buf = LPCM_CODEC_NAME;
descriptor->name.length = LPCM_CODEC_NAME_LENGTH;
descriptor->sampling_rate = sampling_rate;
descriptor->channel_count = channel_count;
return descriptor;
}
MPF_DECLARE(mpf_codec_descriptor_t*) mpf_event_descriptor_create(apr_uint16_t sampling_rate, apr_pool_t *pool)
{
mpf_codec_descriptor_t *descriptor = apr_palloc(pool,sizeof(mpf_codec_descriptor_t));
mpf_codec_descriptor_init(descriptor);
descriptor->payload_type = 101;
descriptor->name.buf = TEL_EVENT_NAME;
descriptor->name.length = TEL_EVENT_NAME_LENGTH;
descriptor->sampling_rate = sampling_rate;
descriptor->channel_count = 1;
descriptor->format.buf = TEL_EVENT_FMTP;
descriptor->format.length = TEL_EVENT_FMTP_LENGTH;
return descriptor;
}
static mpf_codec_t* mpf_termination_default_codec_create(mpf_termination_t *termination)
{
mpf_codec_t *codec;
const mpf_codec_descriptor_t *default_descriptor = l16_descriptor_get();
mpf_codec_descriptor_t *descriptor = apr_palloc(termination->pool,sizeof(mpf_codec_descriptor_t));
mpf_codec_descriptor_init(descriptor);
*descriptor = *default_descriptor;
codec = mpf_codec_manager_codec_get(
termination->codec_manager,
descriptor,
termination->pool);
return codec;
}