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Simplify ALSA backend code

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This commit is contained in:
Iwan Timmer
2014-05-25 12:44:03 +02:00
parent b59f74a96a
commit b9a39a5d89
1 changed files with 2 additions and 27 deletions
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jni/nv_alsa/nv_alsa.c
+2 -27
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@@ -1,6 +1,3 @@
/* Use the newer ALSA API */
#define ALSA_PCM_NEW_HW_PARAMS_API
/* All of the ALSA library API is defined /* All of the ALSA library API is defined
* in this header */ * in this header */
#include <alsa/asoundlib.h> #include <alsa/asoundlib.h>
@@ -9,42 +6,20 @@ snd_pcm_t *handle;
int nv_alsa_init(unsigned int channelCount, unsigned int sampleRate, unsigned char* device) { int nv_alsa_init(unsigned int channelCount, unsigned int sampleRate, unsigned char* device) {
int rc; int rc;
snd_pcm_hw_params_t *params;
int dir;
/* Open PCM device for playback. */ /* Open PCM device for playback. */
if ((rc = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) != 0) if ((rc = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) != 0)
return rc; return rc;
snd_pcm_hw_params_alloca(&params); if ((rc = snd_pcm_set_params(handle, SND_PCM_FORMAT_S16_LE, SND_PCM_ACCESS_RW_INTERLEAVED, channelCount, sampleRate, 1, 50000)) != 0) //50ms latency
snd_pcm_hw_params_any(handle, params);
if ((rc = snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED)) != 0)
return rc;
if ((rc = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE)) != 0)
return rc;
if ((rc = snd_pcm_hw_params_set_channels(handle, params, channelCount)) != 0)
return rc;
if ((rc = snd_pcm_hw_params_set_rate_near(handle, params, &sampleRate, &dir)) != 0)
return rc;
snd_pcm_uframes_t frames = 32;
if ((rc = snd_pcm_hw_params_set_period_size_near(handle, params, &frames, &dir)) != 0)
return rc;
if ((rc = snd_pcm_hw_params(handle, params)) != 0)
return rc; return rc;
} }
int nv_alsa_play(const unsigned char* indata, int data_len) { int nv_alsa_play(const unsigned char* indata, int data_len) {
int frames = data_len/4; /* 2 bytes/sample, 2 channels */ int frames = data_len/4; /* 2 bytes/sample, 2 channels */
int rc = snd_pcm_writei(handle, indata, frames); int rc = snd_pcm_writei(handle, indata, frames);
if (rc == -EPIPE) { if (rc == -EPIPE)
snd_pcm_prepare(handle); snd_pcm_prepare(handle);
}
return rc; return rc;
} }