Support mono to stereo conversion in audiomixer.Mixer

Author: relic-se

shared-module/audiocore/__init__.c

@@ -196,12 +196,12 @@ void audiosample_convert_s16s_u8s(uint8_t *buffer_out, const int16_t *buffer_in,
     }
 }
 
-void audiosample_must_match(audiosample_base_t *self, mp_obj_t other_in) {
+void audiosample_must_match(audiosample_base_t *self, mp_obj_t other_in, bool allow_mono_to_stereo) {
     const audiosample_base_t *other = audiosample_check(other_in);
     if (other->sample_rate != self->sample_rate) {
         mp_raise_ValueError_varg(MP_ERROR_TEXT("The sample's %q does not match"), MP_QSTR_sample_rate);
     }
-    if (other->channel_count != self->channel_count) {
+    if ((!allow_mono_to_stereo || (allow_mono_to_stereo && self->channel_count != 2)) && other->channel_count != self->channel_count) {
         mp_raise_ValueError_varg(MP_ERROR_TEXT("The sample's %q does not match"), MP_QSTR_channel_count);
     }
     if (other->bits_per_sample != self->bits_per_sample) {

shared-module/audiocore/__init__.h

@@ -89,7 +89,7 @@ static inline void audiosample_get_buffer_structure_checked(mp_obj_t self_in, bo
     audiosample_get_buffer_structure(audiosample_check(self_in), single_channel_output, single_buffer, samples_signed, max_buffer_length, spacing);
 }
 
-void audiosample_must_match(audiosample_base_t *self, mp_obj_t other);
+void audiosample_must_match(audiosample_base_t *self, mp_obj_t other, bool allow_mono_to_stereo);
 
 void audiosample_convert_u8m_s16s(int16_t *buffer_out, const uint8_t *buffer_in, size_t nframes);
 void audiosample_convert_u8s_s16s(int16_t *buffer_out, const uint8_t *buffer_in, size_t nframes);

shared-module/audiodelays/Chorus.c

@@ -166,7 +166,7 @@ bool common_hal_audiodelays_chorus_get_playing(audiodelays_chorus_obj_t *self) {
 }
 
 void common_hal_audiodelays_chorus_play(audiodelays_chorus_obj_t *self, mp_obj_t sample, bool loop) {
-    audiosample_must_match(&self->base, sample);
+    audiosample_must_match(&self->base, sample, false);
 
     self->sample = sample;
     self->loop = loop;

shared-module/audiodelays/Echo.c

@@ -204,7 +204,7 @@ bool common_hal_audiodelays_echo_get_playing(audiodelays_echo_obj_t *self) {
 }
 
 void common_hal_audiodelays_echo_play(audiodelays_echo_obj_t *self, mp_obj_t sample, bool loop) {
-    audiosample_must_match(&self->base, sample);
+    audiosample_must_match(&self->base, sample, false);
 
     self->sample = sample;
     self->loop = loop;

shared-module/audiodelays/MultiTapDelay.c

@@ -285,7 +285,7 @@ bool common_hal_audiodelays_multi_tap_delay_get_playing(audiodelays_multi_tap_de
 }
 
 void common_hal_audiodelays_multi_tap_delay_play(audiodelays_multi_tap_delay_obj_t *self, mp_obj_t sample, bool loop) {
-    audiosample_must_match(&self->base, sample);
+    audiosample_must_match(&self->base, sample, false);
 
     self->sample = sample;
     self->loop = loop;

shared-module/audiodelays/PitchShift.c

@@ -143,7 +143,7 @@ bool common_hal_audiodelays_pitch_shift_get_playing(audiodelays_pitch_shift_obj_
 }
 
 void common_hal_audiodelays_pitch_shift_play(audiodelays_pitch_shift_obj_t *self, mp_obj_t sample, bool loop) {
-    audiosample_must_match(&self->base, sample);
+    audiosample_must_match(&self->base, sample, false);
 
     self->sample = sample;
     self->loop = loop;

shared-module/audiofilters/Distortion.c

@@ -141,7 +141,7 @@ bool common_hal_audiofilters_distortion_get_playing(audiofilters_distortion_obj_
 }
 
 void common_hal_audiofilters_distortion_play(audiofilters_distortion_obj_t *self, mp_obj_t sample, bool loop) {
-    audiosample_must_match(&self->base, sample);
+    audiosample_must_match(&self->base, sample, false);
 
     self->sample = sample;
     self->loop = loop;

shared-module/audiofilters/Filter.c

@@ -143,7 +143,7 @@ bool common_hal_audiofilters_filter_get_playing(audiofilters_filter_obj_t *self)
 }
 
 void common_hal_audiofilters_filter_play(audiofilters_filter_obj_t *self, mp_obj_t sample, bool loop) {
-    audiosample_must_match(&self->base, sample);
+    audiosample_must_match(&self->base, sample, false);
 
     self->sample = sample;
     self->loop = loop;

shared-module/audiofilters/Phaser.c

@@ -130,7 +130,7 @@ bool common_hal_audiofilters_phaser_get_playing(audiofilters_phaser_obj_t *self)
 }
 
 void common_hal_audiofilters_phaser_play(audiofilters_phaser_obj_t *self, mp_obj_t sample, bool loop) {
-    audiosample_must_match(&self->base, sample);
+    audiosample_must_match(&self->base, sample, false);
 
     self->sample = sample;
     self->loop = loop;

shared-module/audiofreeverb/Freeverb.c

@@ -195,7 +195,7 @@ bool common_hal_audiofreeverb_freeverb_get_playing(audiofreeverb_freeverb_obj_t
 }
 
 void common_hal_audiofreeverb_freeverb_play(audiofreeverb_freeverb_obj_t *self, mp_obj_t sample, bool loop) {
-    audiosample_must_match(&self->base, sample);
+    audiosample_must_match(&self->base, sample, false);
 
     self->sample = sample;
     self->loop = loop;