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#include <stdio.h>
#include <stdlib.h>
#include <plibsys.h>
#include <portaudio.h>
#include <mossrose.h>
#include "channel.h"
struct mossrose_global_t {
PaStream *stream;
struct channel_t *channels;
int n_channels;
} mossrose_global;
static int callback(
const void *input,
void *output,
unsigned long frame_count,
const PaStreamCallbackTimeInfo* time_info,
PaStreamCallbackFlags status_flags,
void *user_data)
{
float *out = output;
float *left, *right;
float l, r;
for (int i=0; i<mossrose_global.n_channels; i++)
channel_update_shared(mossrose_global.channels + i);
for (int i=0; i<frame_count; i++) {
left = out + 2*i;
right = left + 1;
*left = 0;
*right = 0;
for (int j=0; j<mossrose_global.n_channels; j++) {
struct channel_t *chan = mossrose_global.channels + j;
channel_get_next_sample(&l, &r, chan);
*left += l;
*right += r;
}
}
return 0;
}
int mossrose_init(double sample_rate, int n_channels, bool init_plibsys)
{
/* optionally initialze plibsys */
if (init_plibsys)
p_libsys_init();
/* initialize channels */
mossrose_global.n_channels = n_channels;
mossrose_global.channels = malloc(n_channels * sizeof(struct channel_t));
if (mossrose_global.channels == NULL) {
fprintf(stderr, "failed to allocate memory for %d channels\n", n_channels);
return 1;
}
for (int i=0; i<n_channels; i++)
channel_init(mossrose_global.channels + i);
PaError err;
/* initialize portaudio */
err = Pa_Initialize();
if (err != paNoError) {
fprintf(stderr, "failed to initialize portaudio\n");
return 2;
}
/* initialize stream */
err = Pa_OpenDefaultStream(&(mossrose_global.stream), 0, 2, paFloat32, sample_rate, 0, callback, NULL);
if (err != paNoError) {
fprintf(stderr, "failed to open audio stream!\n");
return 3;
}
/* start stream */
err = Pa_StartStream(mossrose_global.stream);
if (err != paNoError) {
fprintf(stderr, "failed to start audio stream\n");
return 4;
}
return 0;
};
int mossrose_play(struct mossrose_sound_t *sound, int channel, int loops)
{
if (channel >= 0) {
/* play on specified channel */
if (channel_sound_load(mossrose_global.channels + channel, sound, true, loops) == 0)
return channel;
else
return -1;
}
else {
/* play on first available channel */
for (int i=0; i<mossrose_global.n_channels; i++) {
struct channel_t *chan = mossrose_global.channels + i;
if (channel_sound_load(chan, sound, false, loops) == 0) return i;
}
return -1;
}
}
void mossrose_channel_set_volume(int channel, float volume) {
struct channel_t *chan = mossrose_global.channels + channel;
channel_set_volume(chan, volume);
}
void mossrose_channel_set_pan(int channel, float left, float right) {
struct channel_t *chan = mossrose_global.channels + channel;
channel_set_pan(chan, left, right);
}
void mossrose_channel_pause(int channel) {
struct channel_t *chan = mossrose_global.channels + channel;
channel_pause(chan);
}
void mossrose_channel_resume(int channel) {
struct channel_t *chan = mossrose_global.channels + channel;
channel_resume(chan);
}
int mossrose_terminate()
{
Pa_AbortStream(mossrose_global.stream);
Pa_CloseStream(mossrose_global.stream);
Pa_Terminate();
return 0;
}
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