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https://github.com/moonlight-stream/moonlight-embedded.git
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56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/* Use the newer ALSA API */
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#define ALSA_PCM_NEW_HW_PARAMS_API
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/* All of the ALSA library API is defined
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* in this header */
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#include <alsa/asoundlib.h>
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snd_pcm_t *handle;
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int nv_alsa_init(unsigned int channelCount, unsigned int sampleRate, unsigned char* device) {
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int rc;
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snd_pcm_hw_params_t *params;
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int dir;
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/* Open PCM device for playback. */
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if ((rc = snd_pcm_open(&handle, device, SND_PCM_STREAM_PLAYBACK, 0)) != 0)
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return rc;
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snd_pcm_hw_params_alloca(¶ms);
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snd_pcm_hw_params_any(handle, params);
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if ((rc = snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED)) != 0)
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return rc;
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if ((rc = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE)) != 0)
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return rc;
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if ((rc = snd_pcm_hw_params_set_channels(handle, params, channelCount)) != 0)
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return rc;
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if ((rc = snd_pcm_hw_params_set_rate_near(handle, params, &sampleRate, &dir)) != 0)
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return rc;
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snd_pcm_uframes_t frames = 32;
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if ((rc = snd_pcm_hw_params_set_period_size_near(handle, params, &frames, &dir)) != 0)
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return rc;
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if ((rc = snd_pcm_hw_params(handle, params)) != 0)
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return rc;
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}
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int nv_alsa_play(const unsigned char* indata, int data_len) {
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int frames = data_len/4; /* 2 bytes/sample, 2 channels */
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int rc = snd_pcm_writei(handle, indata, frames);
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if (rc == -EPIPE) {
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snd_pcm_prepare(handle);
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}
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return rc;
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}
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int nv_alsa_close(void) {
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snd_pcm_drain(handle);
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snd_pcm_close(handle);
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}
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