diff options
| -rw-r--r-- | include/tinyalsa/asoundlib.h | 4 | ||||
| -rw-r--r-- | pcm.c | 19 |
2 files changed, 23 insertions, 0 deletions
diff --git a/include/tinyalsa/asoundlib.h b/include/tinyalsa/asoundlib.h index bd0cdee..14511c9 100644 --- a/include/tinyalsa/asoundlib.h +++ b/include/tinyalsa/asoundlib.h @@ -97,6 +97,10 @@ unsigned int pcm_get_latency(struct pcm *pcm); int pcm_write(struct pcm *pcm, void *data, unsigned int count); int pcm_read(struct pcm *pcm, void *data, unsigned int count); +/* Start and stop a PCM channel that doesn't transfer data */ +int pcm_start(struct pcm *pcm); +int pcm_stop(struct pcm *pcm); + /* * MIXER API @@ -350,3 +350,22 @@ int pcm_is_ready(struct pcm *pcm) { return pcm->fd >= 0; } + +int pcm_start(struct pcm *pcm) +{ + if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE) < 0) + return oops(pcm, errno, "cannot prepare channel"); + if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START) < 0) + return oops(pcm, errno, "cannot start channel"); + + return 0; +} + +int pcm_stop(struct pcm *pcm) +{ + if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_DROP) < 0) + return oops(pcm, errno, "cannot stop channel"); + + return 0; +} + |