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implement alsa source

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split off alsa-util.c


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@76 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2004-07-16 17:03:11 +00:00
parent f2e08d53d0
commit 74bbf31c37
7 changed files with 344 additions and 67 deletions
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73
src/alsa-util.c Normal file
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#include <asoundlib.h>
#include "alsa-util.h"
#include "sample.h"
int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, struct pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *buffer_size) {
int ret = 0;
snd_pcm_hw_params_t *hwparams = NULL;
static const snd_pcm_format_t format_trans[] = {
[PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
[PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
[PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
[PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
[PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
[PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
[PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
};
if (snd_pcm_hw_params_malloc(&hwparams) < 0 ||
snd_pcm_hw_params_any(pcm_handle, hwparams) < 0 ||
snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0 ||
snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[ss->format]) < 0 ||
snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &ss->rate, NULL) < 0 ||
snd_pcm_hw_params_set_channels(pcm_handle, hwparams, ss->channels) < 0 ||
snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, periods, NULL) < 0 ||
snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, buffer_size) < 0 ||
snd_pcm_hw_params(pcm_handle, hwparams) < 0) {
ret = -1;
}
if (hwparams)
snd_pcm_hw_params_free(hwparams);
return ret;
}
int pa_create_io_sources(snd_pcm_t *pcm_handle, struct pa_mainloop_api* m, void ***io_sources, unsigned *n_io_sources, void (*cb)(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata), void *userdata) {
unsigned i;
struct pollfd *pfds, *ppfd;
void **ios;
assert(pcm_handle && m && io_sources && n_io_sources && cb);
*n_io_sources = snd_pcm_poll_descriptors_count(pcm_handle);
pfds = malloc(sizeof(struct pollfd) * *n_io_sources);
assert(pfds);
if (snd_pcm_poll_descriptors(pcm_handle, pfds, *n_io_sources) < 0) {
free(pfds);
return -1;
}
*io_sources = malloc(sizeof(void*) * *n_io_sources);
assert(io_sources);
for (i = 0, ios = *io_sources, ppfd = pfds; i < *n_io_sources; i++, ios++, ppfd++) {
*ios = m->source_io(m, ppfd->fd,
((ppfd->events & POLLIN) ? PA_MAINLOOP_API_IO_EVENT_INPUT : 0) |
((ppfd->events & POLLOUT) ? PA_MAINLOOP_API_IO_EVENT_OUTPUT : 0), cb, userdata);
assert(*ios);
}
free(pfds);
return 0;
}
void pa_free_io_sources(struct pa_mainloop_api* m, void **io_sources, unsigned n_io_sources) {
unsigned i;
void **ios;
assert(m && io_sources);
for (ios = io_sources, i = 0; i < n_io_sources; i++, ios++)
m->cancel_io(m, *ios);
free(io_sources);
}