simpleaudio: handle any audio sample rate

src/minimodem.c

@@ -285,6 +285,9 @@ main( int argc, char*argv[] )
 
     simpleaudio * (*simpleaudio_open_system_audio)() = NULL;
 
+    unsigned int sample_rate = 48000;
+    unsigned int nchannels = 1; // FIXME: only works with one channel
+
     /* configure the default system audio mechanism */
 #if USE_PULSEAUDIO
     simpleaudio_open_system_audio = simpleaudio_open_stream_pulseaudio;
@@ -511,6 +514,7 @@ main( int argc, char*argv[] )
 	    tx_interactive = 0;
 #if USE_SNDFILE
 	    sa_out = simpleaudio_open_stream_sndfile(SA_STREAM_PLAYBACK,
+					sample_rate, nchannels,
 					filename);
 #endif
 	    if ( ! sa_out )
@@ -519,6 +523,7 @@ main( int argc, char*argv[] )
 
 	if ( ! sa_out )
 	    sa_out = simpleaudio_open_system_audio(SA_STREAM_PLAYBACK,
+					sample_rate, nchannels,
 					program_name, "output audio");
 	if ( ! sa_out )
 	    return 1;
@@ -540,7 +545,9 @@ main( int argc, char*argv[] )
     simpleaudio *sa = NULL;
     if ( filename ) {
 #if USE_SNDFILE
-	sa = simpleaudio_open_stream_sndfile(SA_STREAM_RECORD, filename);
+	sa = simpleaudio_open_stream_sndfile(SA_STREAM_RECORD,
+				sample_rate, nchannels,
+				filename);
 #endif
 	if ( ! sa )
 	    return 1;
@@ -548,15 +555,11 @@ main( int argc, char*argv[] )
 
     if ( ! sa )
 	sa = simpleaudio_open_system_audio(SA_STREAM_RECORD,
+				sample_rate, nchannels,
 				program_name, "input audio");
     if ( !sa )
         return 1;
 
-    unsigned int sample_rate = simpleaudio_get_rate(sa);
-    unsigned int nchannels = simpleaudio_get_channels(sa);
-
-    assert( nchannels == 1 );
-
 
     /*
      * Prepare the input sample chunk rate

src/simple-tone-generator.c

@@ -43,7 +43,7 @@ simpleaudio_tone(simpleaudio *sa_out, float tone_freq, size_t nsamples_dur)
 
     if ( tone_freq != 0 ) {
 
-	float wave_nsamples = 48000.0 / tone_freq;	// FIXME rate
+	float wave_nsamples = simpleaudio_get_rate(sa_out) / tone_freq;
 
 	size_t i;
 	for ( i=0; i<nsamples_dur; i++ )

src/simpleaudio-alsa.c

@@ -104,13 +104,10 @@ static const struct simpleaudio_backend simpleaudio_backend_alsa = {
 
 simpleaudio *
 simpleaudio_open_stream_alsa(
-		// unsigned int rate, unsigned int channels,
 		int sa_stream_direction,
+		unsigned int rate, unsigned int channels,
 		char *app_name, char *stream_name )
 {
-    unsigned int rate = 48000;
-    unsigned int channels = 1;
-
     snd_pcm_t *pcm;
     int error;
 

src/simpleaudio-pulse.c

@@ -88,8 +88,8 @@ static const struct simpleaudio_backend simpleaudio_backend_pulse = {
 
 simpleaudio *
 simpleaudio_open_stream_pulseaudio(
-		// unsigned int rate, unsigned int channels,
 		int sa_stream_direction,
+		unsigned int rate, unsigned int channels,
 		char *app_name, char *stream_name )
 {
     int error;
@@ -100,10 +100,8 @@ simpleaudio_open_stream_pulseaudio(
     /* The sample type to use */
     pa_sample_spec ss = {
         .format = PA_SAMPLE_FLOAT32,
-	// .rate = rate,
-	.rate = 48000,
-	// .channels = channels,
-	.channels = 1,
+	.rate = rate,
+	.channels = channels,
     };
 
     pa_buffer_attr attr = {

src/simpleaudio-sndfile.c

@@ -135,13 +135,14 @@ sndfile_format_from_path( const char *path )
 simpleaudio *
 simpleaudio_open_stream_sndfile(
 		int sa_stream_direction,
+		unsigned int rate, unsigned int channels,
 		char *path )
 {
     /* setting for SA_STREAM_PLAYBACK (file write) */
     SF_INFO sfinfo = {
 	.format = 0,
-	.samplerate = 48000,
-	.channels = 1,
+	.samplerate = rate,
+	.channels = channels,
     };
 
     if ( sa_stream_direction == SA_STREAM_PLAYBACK )

src/simpleaudio.h

@@ -38,19 +38,20 @@ enum {
 
 simpleaudio *
 simpleaudio_open_stream_pulseaudio(
-		// unsigned int rate, unsigned int channels,
 		int sa_stream_direction,
+		unsigned int rate, unsigned int channels,
 		char *app_name, char *stream_name );
 
 simpleaudio *
 simpleaudio_open_stream_alsa(
-		// unsigned int rate, unsigned int channels,
 		int sa_stream_direction,
+		unsigned int rate, unsigned int channels,
 		char *app_name, char *stream_name );
 
 simpleaudio *
 simpleaudio_open_stream_sndfile(
 		int sa_stream_direction,
+		unsigned int rate, unsigned int channels,
 		char *path );
 
 /*