static int instream_open_jack(struct SoundIoPrivate *si, struct SoundIoInStreamPrivate *is) {
SoundIoInStream *instream = &is->pub;
SoundIoInStreamJack *isj = &is->backend_data.jack;
SoundIoJack *sij = &si->backend_data.jack;
SoundIoDevice *device = instream->device;
SoundIoDevicePrivate *dev = (SoundIoDevicePrivate *)device;
SoundIoDeviceJack *dj = &dev->backend_data.jack;
if (sij->is_shutdown)
return SoundIoErrorBackendDisconnected;
if (!instream->name)
instream->name = "SoundIoInStream";
instream->software_latency = device->software_latency_current;
isj->period_size = sij->period_size;
jack_status_t status;
isj->client = jack_client_open(instream->name, JackNoStartServer, &status);
if (!isj->client) {
instream_destroy_jack(si, is);
assert(!(status & JackInvalidOption));
if (status & JackShmFailure)
return SoundIoErrorSystemResources;
if (status & JackNoSuchClient)
return SoundIoErrorNoSuchClient;
return SoundIoErrorOpeningDevice;
}
int err;
if ((err = jack_set_process_callback(isj->client, instream_process_callback, is))) {
instream_destroy_jack(si, is);
return SoundIoErrorOpeningDevice;
}
if ((err = jack_set_buffer_size_callback(isj->client, instream_buffer_size_callback, is))) {
instream_destroy_jack(si, is);
return SoundIoErrorOpeningDevice;
}
if ((err = jack_set_sample_rate_callback(isj->client, instream_sample_rate_callback, is))) {
instream_destroy_jack(si, is);
return SoundIoErrorOpeningDevice;
}
if ((err = jack_set_xrun_callback(isj->client, instream_xrun_callback, is))) {
instream_destroy_jack(si, is);
return SoundIoErrorOpeningDevice;
}
jack_on_shutdown(isj->client, instream_shutdown_callback, is);
jack_nframes_t max_port_latency = 0;
// register ports and map channels
int connected_count = 0;
for (int ch = 0; ch < instream->layout.channel_count; ch += 1) {
SoundIoChannelId my_channel_id = instream->layout.channels[ch];
const char *channel_name = soundio_get_channel_name(my_channel_id);
unsigned long flags = JackPortIsInput;
if (!instream->non_terminal_hint)
flags |= JackPortIsTerminal;
jack_port_t *jport = jack_port_register(isj->client, channel_name, JACK_DEFAULT_AUDIO_TYPE, flags, 0);
if (!jport) {
instream_destroy_jack(si, is);
return SoundIoErrorOpeningDevice;
}
SoundIoInStreamJackPort *isjp = &isj->ports[ch];
isjp->dest_port = jport;
// figure out which source port this connects to
SoundIoDeviceJackPort *djp = find_port_matching_channel(device, my_channel_id);
if (djp) {
isjp->source_port_name = djp->full_name;
isjp->source_port_name_len = djp->full_name_len;
connected_count += 1;
max_port_latency = max(max_port_latency, djp->latency_range.max);
}
}
// If nothing got connected, channel layouts aren't working. Just send the
// data in the order of the ports.
if (connected_count == 0) {
max_port_latency = 0;
instream->layout_error = SoundIoErrorIncompatibleDevice;
int ch_count = min(instream->layout.channel_count, dj->port_count);
for (int ch = 0; ch < ch_count; ch += 1) {
SoundIoInStreamJackPort *isjp = &isj->ports[ch];
SoundIoDeviceJackPort *djp = &dj->ports[ch];
isjp->source_port_name = djp->full_name;
isjp->source_port_name_len = djp->full_name_len;
max_port_latency = max(max_port_latency, djp->latency_range.max);
}
}
isj->hardware_latency = max_port_latency / (double)instream->sample_rate;
return 0;
}
static int port_connected(struct GenesisNode *node) {
struct ResampleContext *resample_context = (struct ResampleContext *)node->userdata;
if (!resample_context->in_connected || !resample_context->out_connected)
return 0;
struct GenesisPort *audio_in_port = node->ports[0];
struct GenesisPort *audio_out_port = node->ports[1];
int in_sample_rate = genesis_audio_port_sample_rate(audio_in_port);
int out_sample_rate = genesis_audio_port_sample_rate(audio_out_port);
int gcd = greatest_common_denominator(in_sample_rate, out_sample_rate);
resample_context->upsample_factor = out_sample_rate / gcd;
resample_context->downsample_factor = in_sample_rate / gcd;
resample_context->oversampled_rate = in_sample_rate * resample_context->upsample_factor;
if (in_sample_rate == out_sample_rate) {
destroy(resample_context->impulse_response, resample_context->impulse_response_size);
resample_context->impulse_response = nullptr;
} else {
double cutoff_freq_hz = min(in_sample_rate, out_sample_rate) / 2.0;
double cutoff_freq_float = cutoff_freq_hz / (double)resample_context->oversampled_rate;
double transition_band = transition_band_hz / resample_context->oversampled_rate;
int window_size = ceil(4.0 / transition_band);
window_size += !(window_size % 2);
float *new_impulse_response = reallocate_safe(resample_context->impulse_response,
resample_context->impulse_response_size, window_size);
if (!new_impulse_response)
return GenesisErrorNoMem;
resample_context->impulse_response = new_impulse_response;
resample_context->impulse_response_size = window_size;
// create impulse response by sampling the sinc function and then
// multiplying by the blackman window
for (int i = 0; i < window_size; i += 1) {
// sample the sinc function
double sinc_sample = sinc(2.0 * cutoff_freq_float * (i - (window_size - 1) / 2.0));
double sample = sinc_sample * blackman_window(i, window_size);
resample_context->impulse_response[i] = sample;
}
}
// set up channel matrix
const struct SoundIoChannelLayout * in_channel_layout = genesis_audio_port_channel_layout(audio_in_port);
const struct SoundIoChannelLayout * out_channel_layout = genesis_audio_port_channel_layout(audio_out_port);
memset(resample_context->channel_matrix, 0, sizeof(resample_context->channel_matrix));
int in_contains[GENESIS_CHANNEL_ID_COUNT];
int out_contains[GENESIS_CHANNEL_ID_COUNT];
for (int id = 0; id < GENESIS_CHANNEL_ID_COUNT; id += 1) {
in_contains[id] = soundio_channel_layout_find_channel(in_channel_layout, (SoundIoChannelId)id);
out_contains[id] = soundio_channel_layout_find_channel(out_channel_layout, (SoundIoChannelId)id);
}
bool unaccounted[GENESIS_CHANNEL_ID_COUNT];
for (int id = 0; id < GENESIS_CHANNEL_ID_COUNT; id += 1) {
unaccounted[id] = in_contains[id] >= 0 && out_contains[id] == -1;
}
// route matching channel ids
for (int id = 0; id < GENESIS_CHANNEL_ID_COUNT; id += 1) {
if (in_contains[id] >= 0 && out_contains[id] >= 0)
resample_context->channel_matrix[out_contains[id]][in_contains[id]] = 1.0;
}
// mix front center to left/right
if (unaccounted[SoundIoChannelIdFrontCenter]) {
if (out_contains[SoundIoChannelIdFrontLeft] >= 0 && out_contains[SoundIoChannelIdFrontRight] >= 0) {
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontLeft]][in_contains[SoundIoChannelIdFrontCenter]] += M_SQRT1_2;
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontRight]][in_contains[SoundIoChannelIdFrontCenter]] += M_SQRT1_2;
unaccounted[SoundIoChannelIdFrontCenter] = false;
}
}
// mix back left/right to back center, side or front
if (unaccounted[SoundIoChannelIdBackLeft] && unaccounted[SoundIoChannelIdBackRight]) {
if (out_contains[SoundIoChannelIdBackCenter] >= 0) {
resample_context->channel_matrix[out_contains[SoundIoChannelIdBackCenter]][in_contains[SoundIoChannelIdBackLeft]] += M_SQRT1_2;
resample_context->channel_matrix[out_contains[SoundIoChannelIdBackCenter]][in_contains[SoundIoChannelIdBackRight]] += M_SQRT1_2;
unaccounted[SoundIoChannelIdBackLeft] = false;
unaccounted[SoundIoChannelIdBackRight] = false;
} else if (out_contains[SoundIoChannelIdSideLeft] >= 0 &&
out_contains[SoundIoChannelIdSideRight] >= 0)
{
if (in_contains[SoundIoChannelIdSideLeft] >= 0 &&
in_contains[SoundIoChannelIdSideRight] >= 0)
{
resample_context->channel_matrix[out_contains[SoundIoChannelIdSideLeft]][in_contains[SoundIoChannelIdBackLeft]] += M_SQRT1_2;
resample_context->channel_matrix[out_contains[SoundIoChannelIdSideRight]][in_contains[SoundIoChannelIdBackRight]] += M_SQRT1_2;
} else {
resample_context->channel_matrix[out_contains[SoundIoChannelIdSideLeft]][in_contains[SoundIoChannelIdBackLeft]] += 1.0;
resample_context->channel_matrix[out_contains[SoundIoChannelIdSideRight]][in_contains[SoundIoChannelIdBackRight]] += 1.0;
}
unaccounted[SoundIoChannelIdBackLeft] = false;
unaccounted[SoundIoChannelIdBackRight] = false;
} else if (out_contains[SoundIoChannelIdFrontLeft] >= 0 &&
out_contains[SoundIoChannelIdFrontRight] >= 0)
{
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontLeft]][in_contains[SoundIoChannelIdBackLeft]] += surround_mix_level * M_SQRT1_2;
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontRight]][in_contains[SoundIoChannelIdBackRight]] += surround_mix_level * M_SQRT1_2;
unaccounted[SoundIoChannelIdBackLeft] = false;
unaccounted[SoundIoChannelIdBackRight] = false;
} else if (out_contains[SoundIoChannelIdFrontCenter] >= 0) {
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontCenter]][in_contains[SoundIoChannelIdBackLeft]] += surround_mix_level * M_SQRT1_2;
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontCenter]][in_contains[SoundIoChannelIdBackRight]] += surround_mix_level * M_SQRT1_2;
unaccounted[SoundIoChannelIdBackLeft] = false;
unaccounted[SoundIoChannelIdBackRight] = false;
}
}
// mix side left/right into back or front
if (unaccounted[SoundIoChannelIdSideLeft] && unaccounted[SoundIoChannelIdSideRight]) {
if (out_contains[SoundIoChannelIdBackLeft] >= 0 &&
out_contains[SoundIoChannelIdBackRight] >= 0)
{
// if back channels do not exist in the input, just copy side
// channels to back channels, otherwise mix side into back
if (in_contains[SoundIoChannelIdBackLeft] >= 0 &&
in_contains[SoundIoChannelIdBackRight] >= 0)
{
resample_context->channel_matrix[out_contains[SoundIoChannelIdBackLeft]][in_contains[SoundIoChannelIdSideLeft]] += M_SQRT1_2;
resample_context->channel_matrix[out_contains[SoundIoChannelIdBackRight]][in_contains[SoundIoChannelIdSideRight]] += M_SQRT1_2;
} else {
resample_context->channel_matrix[out_contains[SoundIoChannelIdBackLeft]][in_contains[SoundIoChannelIdSideLeft]] += 1.0;
resample_context->channel_matrix[out_contains[SoundIoChannelIdBackRight]][in_contains[SoundIoChannelIdSideRight]] += 1.0;
}
unaccounted[SoundIoChannelIdSideLeft] = false;
unaccounted[SoundIoChannelIdSideRight] = false;
} else if (out_contains[SoundIoChannelIdBackCenter] >= 0) {
resample_context->channel_matrix[out_contains[SoundIoChannelIdBackCenter]][in_contains[SoundIoChannelIdSideLeft]] += M_SQRT1_2;
resample_context->channel_matrix[out_contains[SoundIoChannelIdBackCenter]][in_contains[SoundIoChannelIdSideRight]] += M_SQRT1_2;
unaccounted[SoundIoChannelIdSideLeft] = false;
unaccounted[SoundIoChannelIdSideRight] = false;
} else if (out_contains[SoundIoChannelIdFrontLeft] >= 0 &&
out_contains[SoundIoChannelIdFrontRight] >= 0)
{
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontLeft]][in_contains[SoundIoChannelIdSideLeft]] += surround_mix_level;
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontRight]][in_contains[SoundIoChannelIdSideRight]] += surround_mix_level;
unaccounted[SoundIoChannelIdSideLeft] = false;
unaccounted[SoundIoChannelIdSideRight] = false;
} else if (out_contains[SoundIoChannelIdFrontCenter] >= 0) {
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontCenter]][in_contains[SoundIoChannelIdSideLeft]] += surround_mix_level;
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontCenter]][in_contains[SoundIoChannelIdSideRight]] += surround_mix_level;
unaccounted[SoundIoChannelIdSideLeft] = false;
unaccounted[SoundIoChannelIdSideRight] = false;
}
}
// mix left of center/right of center into front left/right or center
if (unaccounted[SoundIoChannelIdFrontLeftCenter] &&
unaccounted[SoundIoChannelIdFrontRightCenter])
{
if (out_contains[SoundIoChannelIdFrontLeft] >= 0 && out_contains[SoundIoChannelIdFrontRight] >= 0) {
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontLeft]][in_contains[SoundIoChannelIdFrontLeftCenter]] += 1.0;
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontRight]][in_contains[SoundIoChannelIdFrontRightCenter]] += 1.0;
unaccounted[SoundIoChannelIdFrontLeftCenter] = false;
unaccounted[SoundIoChannelIdFrontRightCenter] = false;
} else if (out_contains[SoundIoChannelIdFrontCenter] >= 0) {
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontCenter]][in_contains[SoundIoChannelIdFrontLeftCenter]] += M_SQRT1_2;
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontCenter]][in_contains[SoundIoChannelIdFrontRightCenter]] += M_SQRT1_2;
unaccounted[SoundIoChannelIdFrontLeftCenter] = false;
unaccounted[SoundIoChannelIdFrontRightCenter] = false;
}
}
// mix LFE into front left/right or center
if (unaccounted[SoundIoChannelIdLfe]) {
if (out_contains[SoundIoChannelIdFrontCenter] >= 0) {
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontCenter]][in_contains[SoundIoChannelIdLfe]] += lfe_mix_level;
unaccounted[SoundIoChannelIdLfe] = false;
} else if (out_contains[SoundIoChannelIdFrontLeft] >= 0 &&
out_contains[SoundIoChannelIdFrontRight] >= 0)
{
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontLeft]][in_contains[SoundIoChannelIdLfe]] += lfe_mix_level * M_SQRT1_2;
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontRight]][in_contains[SoundIoChannelIdLfe]] += lfe_mix_level * M_SQRT1_2;
unaccounted[SoundIoChannelIdLfe] = false;
}
}
// mix front left/right to front center
if (unaccounted[SoundIoChannelIdFrontLeft] && unaccounted[SoundIoChannelIdFrontRight]) {
if (out_contains[SoundIoChannelIdFrontCenter] >= 0) {
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontCenter]][in_contains[SoundIoChannelIdFrontLeft]] += 0.5;
resample_context->channel_matrix[out_contains[SoundIoChannelIdFrontCenter]][in_contains[SoundIoChannelIdFrontRight]] += 0.5;
unaccounted[SoundIoChannelIdFrontLeft] = false;
unaccounted[SoundIoChannelIdFrontRight] = false;
}
}
// make sure all input channels are accounted for
for (int id = 0; id < GENESIS_CHANNEL_ID_COUNT; id += 1) {
if (unaccounted[id]) {
fprintf(stderr, "unaccounted: %s\n", soundio_get_channel_name((SoundIoChannelId)id));
return GenesisErrorUnimplemented;
}
}
// normalize per channel
for (int out_ch = 0; out_ch < out_channel_layout->channel_count; out_ch += 1) {
double sum = 0.0;
for (int in_ch = 0; in_ch < in_channel_layout->channel_count; in_ch += 1) {
sum += resample_context->channel_matrix[out_ch][in_ch];
}
if (sum > 0.0) {
for (int in_ch = 0; in_ch < in_channel_layout->channel_count; in_ch += 1) {
resample_context->channel_matrix[out_ch][in_ch] *= 1.0 / sum;
}
}
}
return 0;
}