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hosted: Allow ALSA driver to switch output device at runtime

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* Allow output device name to be specified
 * Set hw/swparams prior to actual playback start, not at init
 * If told to open a new device, cleanly close down old one.

Change-Id: Ib97310ec23588136c031466ee9c22312ab0f9f5a
This commit is contained in:
Solomon Peachy 2020-10-21 08:53:12 -04:00
parent 6b13437aff
commit 884d8922e3
1 changed files with 28 additions and 19 deletions
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45
firmware/target/hosted/pcm-alsa.c
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@ -38,7 +38,6 @@
* supposedly safer, it appears to use more CPU (however I didn't measure it
* accurately, only looked at htop). At least, in this mode the "default"
* device works which doesnt break with other apps running.
* device works which doesnt break with other apps running.
*/
#include "autoconf.h"
@ -66,11 +65,13 @@
#include <pthread.h>
#include <signal.h>
#define USE_ASYNC_CALLBACK
/* plughw:0,0 works with both, however "default" is recommended.
* default doesnt seem to work with async callback but doesn't break
* with multple applications running */
static char device[] = "plughw:0,0"; /* playback device */
#define DEFAULT_PLAYBACK_DEVICE "plughw:0,0"
#define USE_ASYNC_CALLBACK
static const snd_pcm_access_t access_ = SND_PCM_ACCESS_RW_INTERLEAVED; /* access mode */
#if defined(SONY_NWZ_LINUX) || defined(HAVE_FIIO_LINUX_CODEC)
/* Sony NWZ must use 32-bit per sample */
@ -81,8 +82,8 @@ 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 real_sample_rate = 0;
static unsigned int last_sample_rate = 0;
static unsigned int real_sample_rate;
static unsigned int last_sample_rate;
static snd_pcm_t *handle = NULL;
static snd_pcm_sframes_t buffer_size;
@ -452,34 +453,39 @@ void cleanup(void)
free(frames);
frames = NULL;
snd_pcm_close(handle);
handle = NULL;
}
void pcm_play_dma_init(void)
static void open_hwdev(const char *device)
{
int err;
logf("PCM DMA Init");
logf("opendev %s (%p)", device, handle);
audiohw_preinit();
/* Close old handle first, if needed */
if (handle) {
pcm_play_dma_stop();
snd_pcm_close(handle);
handle = NULL;
}
if ((err = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) < 0)
{
panicf("%s(): Cannot open device %s: %s\n", __func__, device, snd_strerror(err));
}
if ((err = snd_pcm_nonblock(handle, 1)))
panicf("Could not set non-block mode: %s\n", snd_strerror(err));
if ((err = set_hwparams(handle)) < 0)
{
panicf("Setting of hwparams failed: %s\n", snd_strerror(err));
}
if ((err = set_swparams(handle)) < 0)
{
panicf("Setting of swparams failed: %s\n", snd_strerror(err));
last_sample_rate = 0;
}
pcm_dma_apply_settings();
void pcm_play_dma_init(void)
{
logf("PCM DMA Init");
audiohw_preinit();
open_hwdev(DEFAULT_PLAYBACK_DEVICE);
#ifdef USE_ASYNC_CALLBACK
pthread_mutexattr_t attr;
@ -527,7 +533,10 @@ static void pcm_dma_apply_settings_nolock(void)
audiohw_mute(true);
#endif
snd_pcm_drop(handle);
set_hwparams(handle);
set_hwparams(handle); // FIXME: check return code?
set_swparams(handle); // FIXME: check return code?
#if defined(HAVE_NWZ_LINUX_CODEC)
/* Sony NWZ linux driver uses a nonstandard mecanism to set the sampling rate */
audiohw_set_frequency(pcm_sampr);