diff options
Diffstat (limited to 'plugins/audio/audio-alsa.c')
| -rw-r--r-- | plugins/audio/audio-alsa.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/plugins/audio/audio-alsa.c b/plugins/audio/audio-alsa.c new file mode 100644 index 00000000..8c08c8db --- /dev/null +++ b/plugins/audio/audio-alsa.c @@ -0,0 +1,82 @@ +#include "audio-api.h" +#include "audio-alsa.h" + +PUBLIC unsigned char _alsa_init (const char *name, audioCtxHandleT *ctx) { + + snd_pcm_t *dev; + snd_pcm_hw_params_t *params; + int num; + + if (snd_pcm_open (&dev, name, SND_PCM_STREAM_PLAYBACK, 0) < 0) + return 0; + + snd_pcm_hw_params_malloc (¶ms); + snd_pcm_hw_params_any (dev, params); + snd_pcm_hw_params_set_access (dev, params, SND_PCM_ACCESS_RW_INTERLEAVED); + snd_pcm_hw_params_set_format (dev, params, SND_PCM_FORMAT_S16_LE); + snd_pcm_hw_params_set_rate_near (dev, params, &ctx->rate, 0); + snd_pcm_hw_params_set_channels (dev, params, ctx->channels); + if (snd_pcm_hw_params (dev, params) < 0) { + snd_pcm_hw_params_free (params); + return 0; + } + snd_pcm_prepare (dev); + + /* allocate the global array if it hasn't been done */ + if (!dev_ctx) { + dev_ctx = (dev_ctx_T**) malloc (sizeof(dev_ctx_T)); + dev_ctx[0] = (dev_ctx_T*) malloc (sizeof(dev_ctx_T)); + dev_ctx[0]->name = NULL; + dev_ctx[0]->dev = NULL; + } + + /* is a card with similar name already opened ? */ + for (num = 0; num < (sizeof(dev_ctx)/sizeof(dev_ctx_T)); num++) { + if (dev_ctx[num]->name && + !strcmp (dev_ctx[num]->name, name)) + return 0; + } + num++; + + /* it's not... let us add it to the global array */ + dev_ctx[num] = (dev_ctx_T*) malloc (sizeof(dev_ctx_T)); + dev_ctx[num]->name = strdup (name); + dev_ctx[num]->dev = dev; + dev_ctx[num]->params = params; + + return 1; +} + +PUBLIC void _alsa_free (const char *name) { + + int num; + + for (num = 0; num < (sizeof(dev_ctx)/sizeof(dev_ctx_T)); num++) { + if (dev_ctx[num]->name && + !strcmp (dev_ctx[num]->name, name)) { + snd_pcm_close (dev_ctx[num]->dev); + snd_pcm_hw_params_free (dev_ctx[num]->params); + free (dev_ctx[num]->name); + dev_ctx[num]->name = NULL; + dev_ctx[num]->dev = NULL; + free(dev_ctx[num]); + return; + } + } +} + +PUBLIC void _alsa_play (unsigned int num, void *buf, int len) { + + if (!dev_ctx || !dev_ctx[num]) + return; + + int16_t *cbuf = (int16_t *)buf; + int frames = len / 2; + int res; + + if ((res = snd_pcm_writei (dev_ctx[num]->dev, cbuf, frames)) != frames) { + snd_pcm_recover (dev_ctx[num]->dev, res, 0); + snd_pcm_prepare (dev_ctx[num]->dev); + } + /* snd_pcm_drain (dev_ctx[num]->dev); */ +}
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