static int alsa_play (const char *buff, const size_t size)
{
int to_write = size;
int buf_pos = 0;
assert (chunk_size > 0);
debug ("Got %d bytes to play", (int)size);
while (to_write) {
int to_copy = MIN((size_t)to_write,
sizeof(alsa_buf) - (size_t)alsa_buf_fill);
memcpy (alsa_buf + alsa_buf_fill, buff + buf_pos, to_copy);
to_write -= to_copy;
buf_pos += to_copy;
alsa_buf_fill += to_copy;
debug ("Copied %d bytes to alsa_buf (now is filled with %d "
"bytes)", to_copy, alsa_buf_fill);
if (play_buf_chunks() < 0)
return -1;
}
debug ("Played everything");
return size;
}
static void alsa_close ()
{
snd_pcm_sframes_t delay;
assert (handle != NULL);
/* play what remained in the buffer */
if (alsa_buf_fill) {
assert (alsa_buf_fill < chunk_size);
snd_pcm_format_set_silence (params.format,
alsa_buf + alsa_buf_fill,
(chunk_size - alsa_buf_fill) / bytes_per_frame
* params.channels);
alsa_buf_fill = chunk_size;
play_buf_chunks ();
}
/* Wait for ALSA buffers to empty.
* Do not be tempted to use snd_pcm_nonblock() and snd_pcm_drain()
* here; there are two bugs in ALSA which make it a bad idea (see
* the SVN commit log for r2550). Instead we sleep for the duration
* of the still unplayed samples. */
if (snd_pcm_delay (handle, &delay) == 0)
usleep ((uint64_t) delay * 1000000 / params.rate);
snd_pcm_close (handle);
logit ("ALSA device closed");
params.format = 0;
params.rate = 0;
params.channels = 0;
handle = NULL;
}
static void alsa_close ()
{
assert (handle != NULL);
/* play what remained in the buffer */
if (alsa_buf_fill) {
assert (alsa_buf_fill < chunk_size);
/* FIXME: why the last argument is multiplied by number of
* channels? */
snd_pcm_format_set_silence (params.format,
alsa_buf + alsa_buf_fill,
(chunk_size - alsa_buf_fill) / bytes_per_frame
* params.channels);
play_buf_chunks ();
}
params.format = 0;
params.rate = 0;
params.channels = 0;
snd_pcm_close (handle);
logit ("ALSA device closed");
handle = NULL;
}
static void alsa_close ()
{
assert (handle != NULL);
/* play what remained in the buffer */
if (alsa_buf_fill) {
assert (alsa_buf_fill < chunk_size);
snd_pcm_format_set_silence (params.format,
alsa_buf + alsa_buf_fill,
(chunk_size - alsa_buf_fill) / bytes_per_frame
* params.channels);
alsa_buf_fill = chunk_size;
play_buf_chunks ();
}
params.format = 0;
params.rate = 0;
params.channels = 0;
snd_pcm_close (handle);
logit ("ALSA device closed");
handle = NULL;
}
