mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-10-31 22:25:35 -04:00
Fix dshare plugin codes
Modify dshare plugin codes to follow the recent change of dmix: proper XRUN and poll handling, async data transfer.
This commit is contained in:
Takashi Iwai
parent
1661759351
commit
ddd9c29a0d
1 changed files with 128 additions and 60 deletions
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@ -49,6 +49,9 @@
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const char *_snd_module_pcm_dshare = "";
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#endif
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/* start is pending - this state happens when rate plugin does a delayed commit */
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#define STATE_RUN_PENDING 1024
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static void do_silence(snd_pcm_t *pcm)
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{
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snd_pcm_direct_t *dshare = pcm->private_data;
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@ -94,30 +97,51 @@ static void share_areas(snd_pcm_direct_t *dshare,
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/*
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* synchronize shm ring buffer with hardware
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*/
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static void snd_pcm_dshare_sync_area(snd_pcm_t *pcm, snd_pcm_uframes_t size)
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static void snd_pcm_dshare_sync_area(snd_pcm_t *pcm)
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{
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snd_pcm_direct_t *dshare = pcm->private_data;
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snd_pcm_uframes_t appl_ptr, slave_appl_ptr, transfer;
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snd_pcm_uframes_t appl_ptr, slave_appl_ptr, slave_bsize;
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snd_pcm_uframes_t size, slave_hw_ptr;
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const snd_pcm_channel_area_t *src_areas, *dst_areas;
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/* get the start of update area */
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appl_ptr = dshare->appl_ptr - size;
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if (appl_ptr > pcm->boundary)
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appl_ptr += pcm->boundary;
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appl_ptr %= pcm->buffer_size;
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/* calculate the size to transfer */
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size = dshare->appl_ptr - dshare->last_appl_ptr;
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if (! size)
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return;
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slave_bsize = dshare->shmptr->s.buffer_size;
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slave_hw_ptr = dshare->slave_hw_ptr;
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/* don't write on the last active period - this area may be cleared
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* by the driver during write operation...
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*/
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slave_hw_ptr -= slave_hw_ptr % dshare->shmptr->s.period_size;
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slave_hw_ptr += slave_bsize;
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if (dshare->slave_hw_ptr > dshare->slave_appl_ptr)
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slave_hw_ptr -= dshare->shmptr->s.boundary;
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if (dshare->slave_appl_ptr + size >= slave_hw_ptr)
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size = slave_hw_ptr - dshare->slave_appl_ptr;
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if (! size)
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return;
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/* add sample areas here */
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src_areas = snd_pcm_mmap_areas(pcm);
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dst_areas = snd_pcm_mmap_areas(dshare->spcm);
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slave_appl_ptr = dshare->slave_appl_ptr % dshare->shmptr->s.buffer_size;
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appl_ptr = dshare->last_appl_ptr % pcm->buffer_size;
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dshare->last_appl_ptr += size;
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dshare->last_appl_ptr %= pcm->boundary;
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slave_appl_ptr = dshare->slave_appl_ptr % slave_bsize;
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dshare->slave_appl_ptr += size;
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dshare->slave_appl_ptr %= dshare->shmptr->s.boundary;
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while (size > 0) {
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transfer = appl_ptr + size > pcm->buffer_size ? pcm->buffer_size - appl_ptr : size;
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transfer = slave_appl_ptr + transfer > dshare->shmptr->s.buffer_size ? dshare->shmptr->s.buffer_size - slave_appl_ptr : transfer;
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size -= transfer;
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for (;;) {
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snd_pcm_uframes_t transfer = size;
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if (appl_ptr + transfer > pcm->buffer_size)
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transfer = pcm->buffer_size - appl_ptr;
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if (slave_appl_ptr + transfer > slave_bsize)
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transfer = slave_bsize - slave_appl_ptr;
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share_areas(dshare, src_areas, dst_areas, appl_ptr, slave_appl_ptr, transfer);
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size -= transfer;
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if (! size)
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break;
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slave_appl_ptr += transfer;
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slave_appl_ptr %= dshare->shmptr->s.buffer_size;
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slave_appl_ptr %= slave_bsize;
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appl_ptr += transfer;
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appl_ptr %= pcm->buffer_size;
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}
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@ -146,6 +170,10 @@ static int snd_pcm_dshare_sync_ptr(snd_pcm_t *pcm)
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diff = slave_hw_ptr - old_slave_hw_ptr;
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if (diff == 0) /* fast path */
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return 0;
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if (dshare->state != SND_PCM_STATE_RUNNING &&
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dshare->state != SND_PCM_STATE_DRAINING)
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/* not really started yet - don't update hw_ptr */
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return 0;
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if (diff < 0) {
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slave_hw_ptr += dshare->shmptr->s.boundary;
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diff = slave_hw_ptr - old_slave_hw_ptr;
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@ -155,17 +183,23 @@ static int snd_pcm_dshare_sync_ptr(snd_pcm_t *pcm)
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// printf("sync ptr diff = %li\n", diff);
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if (pcm->stop_threshold >= pcm->boundary) /* don't care */
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return 0;
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if ((avail = snd_pcm_mmap_playback_avail(pcm)) >= pcm->stop_threshold) {
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avail = snd_pcm_mmap_playback_avail(pcm);
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if (avail > dshare->avail_max)
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dshare->avail_max = avail;
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if (avail >= pcm->stop_threshold) {
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struct timeval tv;
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snd_timer_stop(dshare->timer);
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gettimeofday(&tv, 0);
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dshare->trigger_tstamp.tv_sec = tv.tv_sec;
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dshare->trigger_tstamp.tv_nsec = tv.tv_usec * 1000L;
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dshare->state = SND_PCM_STATE_XRUN;
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dshare->avail_max = avail;
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return -EPIPE;
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if (dshare->state == SND_PCM_STATE_RUNNING) {
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dshare->state = SND_PCM_STATE_XRUN;
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return -EPIPE;
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}
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dshare->state = SND_PCM_STATE_SETUP;
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/* clear queue to remove pending poll events */
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snd_pcm_direct_clear_timer_queue(dshare);
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}
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if (avail > dshare->avail_max)
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dshare->avail_max = avail;
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return 0;
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}
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@ -176,7 +210,6 @@ static int snd_pcm_dshare_sync_ptr(snd_pcm_t *pcm)
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static int snd_pcm_dshare_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
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{
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snd_pcm_direct_t *dshare = pcm->private_data;
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snd_pcm_state_t state;
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switch (dshare->state) {
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case SNDRV_PCM_STATE_DRAINING:
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@ -187,8 +220,7 @@ static int snd_pcm_dshare_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
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break;
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}
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memset(status, 0, sizeof(*status));
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state = snd_pcm_state(dshare->spcm);
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status->state = state == SND_PCM_STATE_RUNNING ? dshare->state : state;
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status->state = snd_pcm_state(dshare->spcm);
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status->trigger_tstamp = dshare->trigger_tstamp;
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status->tstamp = snd_pcm_hw_fast_tstamp(dshare->spcm);
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status->avail = snd_pcm_mmap_playback_avail(pcm);
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@ -204,11 +236,12 @@ static snd_pcm_state_t snd_pcm_dshare_state(snd_pcm_t *pcm)
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case SND_PCM_STATE_SUSPENDED:
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return SND_PCM_STATE_SUSPENDED;
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case SND_PCM_STATE_DISCONNECTED:
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dshare->state = SNDRV_PCM_STATE_DISCONNECTED;
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return -ENOTTY;
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return SND_PCM_STATE_DISCONNECTED;
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default:
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break;
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}
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if (dshare->state == STATE_RUN_PENDING)
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return SNDRV_PCM_STATE_RUNNING;
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return dshare->state;
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}
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@ -223,8 +256,10 @@ static int snd_pcm_dshare_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delayp)
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err = snd_pcm_dshare_sync_ptr(pcm);
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if (err < 0)
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return err;
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/* fallthru */
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case SNDRV_PCM_STATE_PREPARED:
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case SNDRV_PCM_STATE_SUSPENDED:
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case STATE_RUN_PENDING:
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*delayp = snd_pcm_mmap_playback_hw_avail(pcm);
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return 0;
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case SNDRV_PCM_STATE_XRUN:
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@ -263,7 +298,7 @@ static int snd_pcm_dshare_prepare(snd_pcm_t *pcm)
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snd_pcm_direct_check_interleave(dshare, pcm);
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// assert(pcm->boundary == dshare->shmptr->s.boundary); /* for sure */
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dshare->state = SND_PCM_STATE_PREPARED;
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dshare->appl_ptr = 0;
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dshare->appl_ptr = dshare->last_appl_ptr = 0;
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dshare->hw_ptr = 0;
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return snd_pcm_direct_set_timer_params(dshare);
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}
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@ -272,11 +307,24 @@ static int snd_pcm_dshare_reset(snd_pcm_t *pcm)
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{
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snd_pcm_direct_t *dshare = pcm->private_data;
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dshare->hw_ptr %= pcm->period_size;
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dshare->appl_ptr = dshare->hw_ptr;
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dshare->appl_ptr = dshare->last_appl_ptr = dshare->hw_ptr;
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dshare->slave_appl_ptr = dshare->slave_hw_ptr = *dshare->spcm->hw.ptr;
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return 0;
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}
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static int snd_pcm_dshare_start_timer(snd_pcm_direct_t *dshare)
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{
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int err;
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snd_pcm_hwsync(dshare->spcm);
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dshare->slave_appl_ptr = dshare->slave_hw_ptr = *dshare->spcm->hw.ptr;
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err = snd_timer_start(dshare->timer);
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if (err < 0)
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return err;
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dshare->state = SND_PCM_STATE_RUNNING;
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return 0;
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}
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static int snd_pcm_dshare_start(snd_pcm_t *pcm)
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{
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snd_pcm_direct_t *dshare = pcm->private_data;
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@ -286,18 +334,16 @@ static int snd_pcm_dshare_start(snd_pcm_t *pcm)
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if (dshare->state != SND_PCM_STATE_PREPARED)
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return -EBADFD;
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snd_pcm_hwsync(dshare->spcm);
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dshare->slave_appl_ptr = dshare->slave_hw_ptr = *dshare->spcm->hw.ptr;
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err = snd_timer_start(dshare->timer);
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if (err < 0)
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return err;
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dshare->state = SND_PCM_STATE_RUNNING;
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avail = snd_pcm_mmap_playback_hw_avail(pcm);
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if (avail < 0)
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if (avail == 0)
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dshare->state = STATE_RUN_PENDING;
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else if (avail < 0)
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return 0;
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if (avail > (snd_pcm_sframes_t)pcm->buffer_size)
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avail = pcm->buffer_size;
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snd_pcm_dshare_sync_area(pcm, avail);
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else {
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if ((err = snd_pcm_dshare_start_timer(dshare)) < 0)
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return err;
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snd_pcm_dshare_sync_area(pcm);
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}
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gettimeofday(&tv, 0);
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dshare->trigger_tstamp.tv_sec = tv.tv_sec;
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dshare->trigger_tstamp.tv_nsec = tv.tv_usec * 1000L;
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@ -309,7 +355,7 @@ static int snd_pcm_dshare_drop(snd_pcm_t *pcm)
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snd_pcm_direct_t *dshare = pcm->private_data;
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if (dshare->state == SND_PCM_STATE_OPEN)
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return -EBADFD;
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snd_timer_stop(dshare->timer);
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snd_pcm_direct_timer_stop(dshare);
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do_silence(pcm);
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dshare->state = SND_PCM_STATE_SETUP;
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return 0;
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@ -323,22 +369,34 @@ static int snd_pcm_dshare_drain(snd_pcm_t *pcm)
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if (dshare->state == SND_PCM_STATE_OPEN)
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return -EBADFD;
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if (pcm->mode & SND_PCM_NONBLOCK)
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return -EAGAIN;
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if (dshare->state == SND_PCM_STATE_PREPARED) {
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if (snd_pcm_mmap_playback_hw_avail(pcm) > 0)
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snd_pcm_dshare_start(pcm);
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else {
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snd_pcm_dshare_drop(pcm);
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return 0;
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}
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}
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stop_threshold = pcm->stop_threshold;
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if (pcm->stop_threshold > pcm->buffer_size)
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pcm->stop_threshold = pcm->buffer_size;
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if (dshare->state == SND_PCM_STATE_PREPARED &&
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snd_pcm_mmap_playback_hw_avail(pcm) > 0)
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snd_pcm_dshare_start(pcm);
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while (dshare->state == SND_PCM_STATE_RUNNING) {
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dshare->state = SND_PCM_STATE_DRAINING;
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do {
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err = snd_pcm_dshare_sync_ptr(pcm);
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if (err < 0)
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if (err < 0) {
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snd_pcm_dshare_drop(pcm);
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break;
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if (pcm->mode & SND_PCM_NONBLOCK)
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return -EAGAIN;
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snd_pcm_wait(pcm, -1);
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}
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}
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if (dshare->state == SND_PCM_STATE_DRAINING) {
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snd_pcm_dshare_sync_area(pcm);
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snd_pcm_wait_nocheck(pcm, -1);
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snd_pcm_direct_clear_timer_queue(dshare); /* force poll to wait */
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}
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} while (dshare->state == SND_PCM_STATE_DRAINING);
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pcm->stop_threshold = stop_threshold;
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return snd_pcm_dshare_drop(pcm);
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return 0;
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}
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static int snd_pcm_dshare_pause(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int enable ATTRIBUTE_UNUSED)
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@ -346,18 +404,22 @@ static int snd_pcm_dshare_pause(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int enable ATTR
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return -EIO;
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}
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static snd_pcm_sframes_t snd_pcm_dshare_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
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static snd_pcm_sframes_t snd_pcm_dshare_rewind(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_uframes_t frames ATTRIBUTE_UNUSED)
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{
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#if 0
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/* FIXME: substract samples from the mix ring buffer, too? */
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snd_pcm_mmap_appl_backward(pcm, frames);
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return frames;
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#else
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return -EIO;
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#endif
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}
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static snd_pcm_sframes_t snd_pcm_dshare_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
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{
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snd_pcm_sframes_t avail;
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avail = snd_pcm_mmap_avail(pcm);
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avail = snd_pcm_mmap_playback_avail(pcm);
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if (avail < 0)
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return 0;
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if (frames > (snd_pcm_uframes_t)avail)
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@ -425,28 +487,34 @@ static snd_pcm_sframes_t snd_pcm_dshare_mmap_commit(snd_pcm_t *pcm,
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default:
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break;
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}
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if (! size)
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return 0;
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snd_pcm_mmap_appl_forward(pcm, size);
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if (dshare->state == SND_PCM_STATE_RUNNING) {
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err = snd_pcm_dshare_sync_ptr(pcm);
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if (err < 0)
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if (dshare->state == STATE_RUN_PENDING) {
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if ((err = snd_pcm_dshare_start_timer(dshare)) < 0)
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return err;
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} else if (dshare->state == SND_PCM_STATE_RUNNING ||
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dshare->state == SND_PCM_STATE_DRAINING)
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snd_pcm_dshare_sync_ptr(pcm);
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if (dshare->state == SND_PCM_STATE_RUNNING ||
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dshare->state == SND_PCM_STATE_DRAINING) {
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/* ok, we commit the changes after the validation of area */
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/* it's intended, although the result might be crappy */
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snd_pcm_dshare_sync_area(pcm, size);
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snd_pcm_dshare_sync_area(pcm);
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/* clear timer queue to avoid a bogus return from poll */
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if (snd_pcm_mmap_playback_avail(pcm) < pcm->avail_min)
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snd_pcm_direct_clear_timer_queue(dshare);
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}
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return size;
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}
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static snd_pcm_sframes_t snd_pcm_dshare_avail_update(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
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static snd_pcm_sframes_t snd_pcm_dshare_avail_update(snd_pcm_t *pcm)
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{
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snd_pcm_direct_t *dshare = pcm->private_data;
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int err;
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if (dshare->state == SND_PCM_STATE_RUNNING) {
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err = snd_pcm_dshare_sync_ptr(pcm);
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if (err < 0)
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return err;
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}
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if (dshare->state == SND_PCM_STATE_RUNNING ||
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dshare->state == SND_PCM_STATE_DRAINING)
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snd_pcm_dshare_sync_ptr(pcm);
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return snd_pcm_mmap_playback_avail(pcm);
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}
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