/* locked version */ static int __snd_pcm_dshare_drain(snd_pcm_t *pcm) { snd_pcm_direct_t *dshare = pcm->private_data; snd_pcm_uframes_t stop_threshold; int err; switch (snd_pcm_state(dshare->spcm)) { case SND_PCM_STATE_SUSPENDED: return -ESTRPIPE; default: break; } if (dshare->state == SND_PCM_STATE_OPEN) return -EBADFD; if (pcm->mode & SND_PCM_NONBLOCK) return -EAGAIN; if (dshare->state == SND_PCM_STATE_PREPARED) { if (snd_pcm_mmap_playback_hw_avail(pcm) > 0) snd_pcm_dshare_start(pcm); else { snd_pcm_dshare_drop(pcm); return 0; } } if (dshare->state == SND_PCM_STATE_XRUN) { snd_pcm_dshare_drop(pcm); return 0; } stop_threshold = pcm->stop_threshold; if (pcm->stop_threshold > pcm->buffer_size) pcm->stop_threshold = pcm->buffer_size; dshare->state = SND_PCM_STATE_DRAINING; do { err = snd_pcm_dshare_sync_ptr(pcm); if (err < 0) { snd_pcm_dshare_drop(pcm); break; } if (dshare->state == SND_PCM_STATE_DRAINING) { snd_pcm_dshare_sync_area(pcm); snd_pcm_wait_nocheck(pcm, -1); snd_pcm_direct_clear_timer_queue(dshare); /* force poll to wait */ switch (snd_pcm_state(dshare->spcm)) { case SND_PCM_STATE_SUSPENDED: return -ESTRPIPE; default: break; } } } while (dshare->state == SND_PCM_STATE_DRAINING); pcm->stop_threshold = stop_threshold; return 0; }
static int snd_pcm_dshare_start(snd_pcm_t *pcm) { snd_pcm_direct_t *dshare = pcm->private_data; snd_pcm_sframes_t avail; int err; if (dshare->state != SND_PCM_STATE_PREPARED) return -EBADFD; avail = snd_pcm_mmap_playback_hw_avail(pcm); if (avail == 0) dshare->state = STATE_RUN_PENDING; else if (avail < 0) return 0; else { if ((err = snd_pcm_dshare_start_timer(dshare)) < 0) return err; snd_pcm_dshare_sync_area(pcm); } gettimestamp(&dshare->trigger_tstamp, pcm->tstamp_type); return 0; }
static int snd_pcm_dshare_start(snd_pcm_t *pcm) { snd_pcm_direct_t *dshare = pcm->private_data; snd_pcm_sframes_t avail; struct timeval tv; int err; if (dshare->state != SND_PCM_STATE_PREPARED) return -EBADFD; avail = snd_pcm_mmap_playback_hw_avail(pcm); if (avail == 0) dshare->state = STATE_RUN_PENDING; else if (avail < 0) return 0; else { if ((err = snd_pcm_dshare_start_timer(dshare)) < 0) return err; snd_pcm_dshare_sync_area(pcm); } gettimeofday(&tv, 0); dshare->trigger_tstamp.tv_sec = tv.tv_sec; dshare->trigger_tstamp.tv_nsec = tv.tv_usec * 1000L; return 0; }