djsundog/circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Fix voice ending in the middle of a buffer.

Browse Source
This commit is contained in:
Scott Shawcroft 2018-10-05 13:00:22 -07:00
parent 2ec7f98c90
commit 8587d8edf0
No known key found for this signature in database
GPG Key ID: FD0EDC4B6C53CA59
1 changed files with 29 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
shared-module/audioio/Mixer.c
View File

@ -244,30 +244,47 @@ audioio_get_buffer_result_t audioio_mixer_get_buffer(audioio_mixer_obj_t* self,
bool voices_active = false;
for (int32_t v = 0; v < self->voice_count; v++) {
audioio_mixer_voice_t* voice = &self->voice[v];
if (voice->sample == NULL) {
continue;
}
uint32_t j = 0;
bool voice_done = voice->sample == NULL;
for (uint32_t i = 0; i < self->len / sizeof(uint32_t); i++) {
if (j >= voice->buffer_length) {
if (!voice_done && j >= voice->buffer_length) {
if (!voice->more_data) {
if (voice->loop) {
audiosample_reset_buffer(voice->sample, false, 0);
} else {
voice->sample = NULL;
break;
voice_done = true;
}
}
// Load another buffer
audioio_get_buffer_result_t result = audiosample_get_buffer(voice->sample, false, 0, (uint8_t**) &voice->remaining_buffer, &voice->buffer_length);
// Track length in terms of words.
voice->buffer_length /= sizeof(uint32_t);
voice->more_data = result == GET_BUFFER_MORE_DATA;
j = 0;
if (!voice_done) {
// Load another buffer
audioio_get_buffer_result_t result = audiosample_get_buffer(voice->sample, false, 0, (uint8_t**) &voice->remaining_buffer, &voice->buffer_length);
// Track length in terms of words.
voice->buffer_length /= sizeof(uint32_t);
voice->more_data = result == GET_BUFFER_MORE_DATA;
j = 0;
}
}
// First active voice gets copied over verbatim.
uint32_t sample_value = voice->remaining_buffer[j];
uint32_t sample_value;
if (voice_done) {
// Exit early if another voice already set all samples once.
if (voices_active) {
continue;
}
sample_value = 0;
if (!self->samples_signed) {
if (self->bits_per_sample == 8) {
sample_value = 0x7f7f7f7f;
} else {
sample_value = 0x7fff7fff;
}
}
} else {
sample_value = voice->remaining_buffer[j];
}
if (!voices_active) {
word_buffer[i] = sample_value;
} else {
@ -293,20 +310,6 @@ audioio_get_buffer_result_t audioio_mixer_get_buffer(audioio_mixer_obj_t* self,
voices_active = true;
}
// No voice is active so zero out the signal.
if (!voices_active) {
uint32_t zero = 0;
if (!self->samples_signed) {
if (self->bits_per_sample == 8) {
zero = 0x7f7f7f7f;
} else {
zero = 0x7fff7fff;
}
}
for (uint32_t i = 0; i < self->len / sizeof(uint32_t); i++) {
word_buffer[i] = zero;
}
}
self->read_count += 1;
} else if (!self->use_first_buffer) {
*buffer = (uint8_t*) self->first_buffer;