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Hosted PCM: Rework auto-muting code a bit

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* If AUDIOHW_MUTE_ON_PAUSE, no meaningful change
     * Unconditionally unmute on playback start
     * xduoox3ii:  Mute on sample rate change
     * rocker/xduoo:  Stay muted after startup

    This avoids the nasty "pop" on startup, without doing
    the full mute-on-pause stuff that causes unacceptable
    dropouts on the X3ii.

Change-Id: I2e3ee0bb8094e288f37a0acada86a80016ce5cac
This commit is contained in:
Solomon Peachy 2020-10-12 09:29:21 -04:00
parent 9ad30869b8
commit 141e91ef1f
5 changed files with 44 additions and 22 deletions
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42
firmware/target/hosted/pcm-alsa.c
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@ -81,8 +81,8 @@ static const snd_pcm_format_t format = SND_PCM_FORMAT_S16; /* sample format *
typedef short sample_t;
#endif
static const int channels = 2; /* count of channels */
static unsigned int sample_rate = 0;
static unsigned int real_sample_rate = 0;
static unsigned int last_sample_rate = 0;
static snd_pcm_t *handle = NULL;
static snd_pcm_sframes_t buffer_size;
@ -148,17 +148,17 @@ static int set_hwparams(snd_pcm_t *handle)
goto error;
}
/* set the stream rate */
sample_rate = srate = pcm_sampr;
srate = pcm_sampr;
err = snd_pcm_hw_params_set_rate_near(handle, params, &srate, 0);
if (err < 0)
{
logf("Rate %iHz not available for playback: %s\n", sample_rate, snd_strerror(err));
logf("Rate %iHz not available for playback: %s\n", pcm_sampr, snd_strerror(err));
goto error;
}
real_sample_rate = srate;
if (real_sample_rate != sample_rate)
if (real_sample_rate != pcm_sampr)
{
logf("Rate doesn't match (requested %iHz, get %iHz)\n", sample_rate, real_sample_rate);
logf("Rate doesn't match (requested %iHz, get %iHz)\n", pcm_sampr, real_sample_rate);
err = -EINVAL;
goto error;
}
@ -517,11 +517,13 @@ void pcm_play_unlock(void)
static void pcm_dma_apply_settings_nolock(void)
{
logf("PCM DMA Settings %d %d", sample_rate, pcm_sampr);
logf("PCM DMA Settings %d %d", last_sample_rate, pcm_sampr);
if (sample_rate != pcm_sampr)
if (last_sample_rate != pcm_sampr)
{
#ifdef AUDIOHW_MUTE_ON_PAUSE
last_sample_rate = pcm_sampr;
#ifdef AUDIOHW_MUTE_ON_SRATE_CHANGE
// XXX AK4450 (xDuoo X3ii) needs to be muted when switching rates.
audiohw_mute(true);
#endif
@ -531,8 +533,10 @@ static void pcm_dma_apply_settings_nolock(void)
/* Sony NWZ linux driver uses a nonstandard mecanism to set the sampling rate */
audiohw_set_frequency(pcm_sampr);
#endif
/* (Will be unmuted by pcm resuming) */
#ifdef AUDIOHW_MUTE_ON_SRATE_CHANGE
audiohw_mute(false);
#endif
/* (Will be unmuted by pcm resuming) */
}
}
@ -560,7 +564,7 @@ void pcm_play_dma_stop(void)
snd_pcm_nonblock(handle, 0);
snd_pcm_drain(handle);
snd_pcm_nonblock(handle, 1);
sample_rate = 0;
last_sample_rate = 0;
#ifdef AUDIOHW_MUTE_ON_PAUSE
audiohw_mute(true);
#endif
@ -575,6 +579,10 @@ void pcm_play_dma_start(const void *addr, size_t size)
pcm_data = addr;
pcm_size = size;
#if !defined(AUDIOHW_MUTE_ON_PAUSE) || !defined(AUDIOHW_MUTE_ON_SRATE_CHANGE)
audiohw_mute(false);
#endif
while (1)
{
snd_pcm_state_t state = snd_pcm_state(handle);
@ -605,14 +613,14 @@ void pcm_play_dma_start(const void *addr, size_t size)
int err = async_rw(handle);
if (err < 0) {
logf("Start error: %s\n", snd_strerror(err));
return;
}
return;
}
#ifdef AUDIOHW_MUTE_ON_PAUSE
audiohw_mute(false);
audiohw_mute(false);
#endif
if (err == 0)
return;
break;
if (err == 0)
return;
break;
}
case SND_PCM_STATE_PAUSED:
{ /* paused, simply resume */