eb82084c53
Adjust IAXClient OpenAL backend so we can use the standard CMake finder for OpenAL (or OpenAL-soft).
319 lines
8.3 KiB
C
319 lines
8.3 KiB
C
#include "iaxclient_lib.h"
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// changed by James Turner to use non-prefixed OpenAL include paths,
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// which is what CMake official FindOpenAL.cmake and the OpenAL-soft Config.cmake
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// expect to provide. This avoids any pre-processor logic to decide which
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// prefix is correct.
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#include <al.h>
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#include <alc.h>
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struct openal_priv_data
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{
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int sample_rate;
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int num_buffers;
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int buffers_head;
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int buffers_tail;
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int buffers_free;
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ALuint* buffers;
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ALCcontext* out_ctx;
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ALuint source;
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ALCdevice* in_dev;
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float input_level;
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float output_level;
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};
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static struct iaxc_audio_device device = {
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"default",
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IAXC_AD_INPUT | IAXC_AD_OUTPUT | IAXC_AD_RING | IAXC_AD_INPUT_DEFAULT | IAXC_AD_OUTPUT_DEFAULT | IAXC_AD_RING_DEFAULT,
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0
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};
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static int openal_error(const char* function, int err)
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{
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fprintf(stderr, "OpenAl function %s failed with code %d\n", function, err);
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return -1;
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}
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int openal_input(struct iaxc_audio_driver *d, void *samples, int *nSamples)
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{
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int err;
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struct openal_priv_data* priv = (struct openal_priv_data*)(d->priv);
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ALCint available;
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ALCsizei request;
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alcGetIntegerv(priv->in_dev, ALC_CAPTURE_SAMPLES, sizeof(available), &available);
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/* do not return less data than caller wanted, iaxclient does not like it */
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request = (available < *nSamples) ? 0 : *nSamples;
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if (request > 0)
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{
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err = alcGetError(priv->in_dev);
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alcCaptureSamples(priv->in_dev, samples, request);
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err = alcGetError(priv->in_dev);
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if (err)
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{
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openal_error("alcCaptureSamples", err);
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*nSamples = 0;
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return 1;
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}
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// software mute, but keep data flowing for sync purposes
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if (priv->input_level == 0)
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{
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memset(samples, 0, 2 * request);
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}
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}
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*nSamples = request;
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return 0;
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}
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static void openal_unqueue(struct openal_priv_data* priv)
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{
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int i;
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ALint err;
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ALint processed;
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alGetSourcei(priv->source, AL_BUFFERS_PROCESSED, &processed);
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#ifdef OPENAL_DEBUG
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{
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ALint queued;
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ALint state;
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alGetSourcei(priv->source, AL_BUFFERS_QUEUED, &queued);
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alGetSourcei(priv->source, AL_SOURCE_STATE, &state);
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fprintf(stderr, "free: %d processed: %d queued: %d head: %d tail: %d state: %d\n",
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priv->buffers_free, processed, queued, priv->buffers_head, priv->buffers_tail, state);
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}
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#endif
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alGetError();
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for(i = 0; i < processed; i++)
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{
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alSourceUnqueueBuffers(priv->source, 1, priv->buffers + priv->buffers_tail);
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err = alGetError();
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if (err)
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{
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openal_error("alSourceUnqueueBuffers", err);
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break;
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}
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if (++priv->buffers_tail >= priv->num_buffers)
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{
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priv->buffers_tail = 0;
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}
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++priv->buffers_free;
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}
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}
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int openal_output(struct iaxc_audio_driver *d, void *samples, int nSamples)
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{
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struct openal_priv_data* priv = (struct openal_priv_data*)(d->priv);
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openal_unqueue(priv);
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/* If we run out of buffers, wait for an arbitrary number to become free */
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if (priv->buffers_free == 0)
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{
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while(priv->buffers_free < 4)
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{
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iaxc_millisleep(100);
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openal_unqueue(priv);
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}
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}
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if (priv->buffers_free > 0)
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{
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ALuint buffer = priv->buffers[priv->buffers_head++];
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if (priv->buffers_head >= priv->num_buffers)
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{
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priv->buffers_head = 0;
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}
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alBufferData(buffer, AL_FORMAT_MONO16, samples, nSamples * 2, priv->sample_rate);
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alSourceQueueBuffers(priv->source, 1, &buffer);
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--priv->buffers_free;
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/* delay start of output until we have 2 buffers */
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if (priv->buffers_free == priv->num_buffers - 2)
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{
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ALint state;
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alGetSourcei(priv->source, AL_SOURCE_STATE, &state);
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if (state != AL_PLAYING)
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{
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#ifdef OPENAL_DEBUG
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fprintf(stderr, "calling alSourcePlay\n");
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#endif
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alSourcePlay(priv->source);
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}
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}
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} else {
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fprintf(stderr, "openal_output buffer overflow\n");
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return 1;
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}
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return 0;
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}
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int openal_select_devices(struct iaxc_audio_driver *d, int input, int output, int ring)
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{
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return (input != 0 || output !=0 || ring != 0) ? -1 : 0;
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}
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int openal_selected_devices(struct iaxc_audio_driver *d, int *input, int *output, int *ring)
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{
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*input = 0;
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*output = 0;
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*ring = 0;
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return 0;
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}
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/*
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Apparently iaxclient calls openal_start a gazillion times and doesn't call openal_stop.
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So let's just make them no-ops.
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*/
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int openal_start(struct iaxc_audio_driver *d)
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{
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int iret = 0;
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struct openal_priv_data* priv = (struct openal_priv_data*)(d->priv);
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if (priv) /* just to stop compiler noise */
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iret = 0;
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return iret;
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}
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int openal_stop(struct iaxc_audio_driver *d)
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{
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int iret = 0;
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struct openal_priv_data* priv = (struct openal_priv_data*)(d->priv);
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if (priv) /* just to stop compiler noise */
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iret = 0;
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return iret;
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}
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float openal_input_level_get(struct iaxc_audio_driver *d)
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{
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struct openal_priv_data* priv = (struct openal_priv_data*)(d->priv);
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return priv->input_level;
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}
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float openal_output_level_get(struct iaxc_audio_driver *d)
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{
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struct openal_priv_data* priv = (struct openal_priv_data*)(d->priv);
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return priv->output_level;
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}
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int openal_input_level_set(struct iaxc_audio_driver *d, float level)
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{
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struct openal_priv_data* priv = (struct openal_priv_data*)(d->priv);
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priv->input_level = (level < 0.5) ? 0 : 1;
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return 0;
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}
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int openal_output_level_set(struct iaxc_audio_driver *d, float level)
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{
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struct openal_priv_data* priv = (struct openal_priv_data*)(d->priv);
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priv->output_level = level;
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alSourcef(priv->source, AL_GAIN, level);
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return 0;
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}
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int openal_play_sound(struct iaxc_sound *s, int ring)
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{
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return 0;
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}
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int openal_stop_sound(int id)
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{
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return 0;
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}
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int openal_mic_boost_get(struct iaxc_audio_driver *d)
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{
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return 0;
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}
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int openal_mic_boost_set(struct iaxc_audio_driver *d, int enable)
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{
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return 0;
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}
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int openal_destroy(struct iaxc_audio_driver *d)
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{
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struct openal_priv_data* priv = (struct openal_priv_data*)(d->priv);
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alcCaptureStop(priv->in_dev);
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alcCaptureCloseDevice(priv->in_dev);
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alDeleteSources(1, &priv->source);
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return 0;
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}
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int openal_initialize(struct iaxc_audio_driver *d, int sample_rate)
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{
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struct openal_priv_data* priv = malloc(sizeof(struct openal_priv_data));
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int err = alGetError();
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d->priv = priv;
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// First we are looking for output device
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priv->out_ctx = alcGetCurrentContext();
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if( priv->out_ctx == NULL ) { // FGCom standalone only
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ALCdevice* out_dev = alcOpenDevice(NULL);
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if (out_dev == 0) return openal_error("alcOpenDevice", alGetError());
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priv->out_ctx = alcCreateContext(out_dev, 0);
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if (priv->out_ctx == 0) return openal_error("alcCreateContext", alGetError());
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}
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alcMakeContextCurrent(priv->out_ctx);
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if ((err = alGetError())) return openal_error("alcMakeContextCurrent", err);
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// Then we look for input device
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priv->in_dev = alcCaptureOpenDevice(NULL, 8000, AL_FORMAT_MONO16, 800);
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if (!priv->in_dev) return openal_error("alcCaptureOpenDevice", alGetError());
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if ((err = alGetError())) return openal_error("alcCaptureOpenDevice1", alGetError());
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alcCaptureStart(priv->in_dev);
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if ((err = alGetError())) return openal_error("alcCaptureStart", err);
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priv->sample_rate = sample_rate;
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priv->num_buffers = 20;
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priv->input_level = 0;
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priv->output_level = 1;
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priv->buffers_head = 0;
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priv->buffers_tail = 0;
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priv->buffers_free = priv->num_buffers;
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priv->buffers = (ALuint*)malloc(sizeof(ALuint) * priv->num_buffers);
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alGenBuffers(priv->num_buffers, priv->buffers);
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if ((err = alGetError())) return openal_error("alGenBuffers", err);
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alGenSources(1, &priv->source);
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if ((err = alGetError())) return openal_error("alGenSources", err);
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d->initialize = openal_initialize;
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d->destroy = openal_destroy;
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d->select_devices = openal_select_devices;
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d->selected_devices = openal_selected_devices;
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d->start = openal_start;
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d->stop = openal_stop;
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d->output = openal_output;
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d->input = openal_input;
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d->input_level_get = openal_input_level_get;
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d->input_level_set = openal_input_level_set;
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d->output_level_get = openal_output_level_get;
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d->output_level_set = openal_output_level_set;
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d->mic_boost_get = openal_mic_boost_get;
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d->mic_boost_set = openal_mic_boost_set;
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d->play_sound = openal_play_sound;
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d->stop_sound = openal_stop_sound;
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d->nDevices = 1;
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d->devices = &device;
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return 0;
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}
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