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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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77
src/module-alsa-sink.c
View file

@ -11,6 +11,7 @@
#include "modargs.h"
#include "util.h"
#include "sample-util.h"
#include "alsa-util.h"
struct userdata {
snd_pcm_t *pcm_handle;
@ -39,7 +40,7 @@ static const char* const valid_modargs[] = {
static void xrun_recovery(struct userdata *u) {
assert(u);
fprintf(stderr, "*** XRUN ***\n");
fprintf(stderr, "*** ALSA-XRUN (playback) ***\n");
if (snd_pcm_prepare(u->pcm_handle) < 0)
fprintf(stderr, "snd_pcm_prepare() failed\n");
@ -63,13 +64,10 @@ static void do_write(struct userdata *u) {
assert(memchunk->memblock && memchunk->memblock->data && memchunk->length && memchunk->memblock->length && (memchunk->length % u->frame_size) == 0);
assert(u->pcm_handle);
assert(memchunk->memblock);
assert(memchunk->memblock->data);
assert(memchunk->length);
assert(u->frame_size);
if ((frames = snd_pcm_writei(u->pcm_handle, memchunk->memblock->data + memchunk->index, memchunk->length / u->frame_size)) < 0) {
if (frames == -EAGAIN)
return;
if (frames == -EPIPE) {
xrun_recovery(u);
continue;
@ -80,8 +78,9 @@ static void do_write(struct userdata *u) {
}
if (memchunk == &u->memchunk) {
memchunk->index += frames * u->frame_size;
memchunk->length -= frames * u->frame_size;
size_t l = frames * u->frame_size;
memchunk->index += l;
memchunk->length -= l;
if (memchunk->length == 0) {
pa_memblock_unref(memchunk->memblock);
@ -125,23 +124,11 @@ int pa_module_init(struct pa_core *c, struct pa_module*m) {
struct pa_modargs *ma = NULL;
int ret = -1;
struct userdata *u = NULL;
snd_pcm_hw_params_t *hwparams;
const char *dev;
struct pollfd *pfds, *ppfd;
struct pa_sample_spec ss;
unsigned i, periods, fragsize;
unsigned periods, fragsize;
snd_pcm_uframes_t buffer_size;
void ** ios;
size_t frame_size;
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 (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
fprintf(stderr, __FILE__": failed to parse module arguments\n");
@ -169,20 +156,12 @@ int pa_module_init(struct pa_core *c, struct pa_module*m) {
m->userdata = u;
if (snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK) < 0) {
fprintf(stderr, "Error opening PCM device %s\n", dev);
fprintf(stderr, __FILE__": Error opening PCM device %s\n", dev);
goto fail;
}
snd_pcm_hw_params_alloca(&hwparams);
if (snd_pcm_hw_params_any(u->pcm_handle, hwparams) < 0 ||
snd_pcm_hw_params_set_access(u->pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0 ||
snd_pcm_hw_params_set_format(u->pcm_handle, hwparams, format_trans[ss.format]) < 0 ||
snd_pcm_hw_params_set_rate_near(u->pcm_handle, hwparams, &ss.rate, NULL) < 0 ||
snd_pcm_hw_params_set_channels(u->pcm_handle, hwparams, ss.channels) < 0 ||
snd_pcm_hw_params_set_periods_near(u->pcm_handle, hwparams, &periods, NULL) < 0 ||
snd_pcm_hw_params_set_buffer_size_near(u->pcm_handle, hwparams, &buffer_size) < 0 ||
snd_pcm_hw_params(u->pcm_handle, hwparams) < 0) {
fprintf(stderr, "Error setting HW params.\n");
if (pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &buffer_size) < 0) {
fprintf(stderr, __FILE__": Failed to set hardware parameters\n");
goto fail;
}
@ -194,28 +173,11 @@ int pa_module_init(struct pa_core *c, struct pa_module*m) {
pa_sink_set_owner(u->sink, m);
u->sink->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s'", dev);
u->n_io_sources = snd_pcm_poll_descriptors_count(u->pcm_handle);
pfds = malloc(sizeof(struct pollfd) * u->n_io_sources);
assert(pfds);
if (snd_pcm_poll_descriptors(u->pcm_handle, pfds, u->n_io_sources) < 0) {
printf("Unable to obtain poll descriptors for playback.\n");
free(pfds);
if (pa_create_io_sources(u->pcm_handle, c->mainloop, &u->io_sources, &u->n_io_sources, io_callback, u) < 0) {
fprintf(stderr, __FILE__": failed to obtain file descriptors\n");
goto fail;
}
u->io_sources = malloc(sizeof(void*) * u->n_io_sources);
assert(u->io_sources);
for (i = 0, ios = u->io_sources, ppfd = pfds; i < u->n_io_sources; i++, ios++, ppfd++) {
*ios = c->mainloop->source_io(c->mainloop, ppfd->fd,
((ppfd->events & POLLIN) ? PA_MAINLOOP_API_IO_EVENT_INPUT : 0) |
((ppfd->events & POLLOUT) ? PA_MAINLOOP_API_IO_EVENT_OUTPUT : 0), io_callback, u);
assert(*ios);
}
free(pfds);
u->frame_size = frame_size;
u->fragment_size = buffer_size*u->frame_size/periods;
@ -250,14 +212,11 @@ void pa_module_done(struct pa_core *c, struct pa_module*m) {
assert(c && m);
if ((u = m->userdata)) {
unsigned i;
void **ios;
pa_sink_free(u->sink);
if (u->sink)
pa_sink_free(u->sink);
for (ios = u->io_sources, i = 0; i < u->n_io_sources; i++, ios++)
c->mainloop->cancel_io(c->mainloop, *ios);
free(u->io_sources);
if (u->io_sources)
pa_free_io_sources(c->mainloop, u->io_sources, u->n_io_sources);
if (u->pcm_handle) {
snd_pcm_drop(u->pcm_handle);