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authorManuel Bachmann <manuel.bachmann@iot.bzh>2015-12-16 20:38:03 +0100
committerManuel Bachmann <manuel.bachmann@iot.bzh>2015-12-16 20:38:49 +0100
commit241a06586b3602962874e6d2ac09e258ad6173d2 (patch)
tree20aab5fb5c5efa3516b9579256fc0652a83475af /plugins/audio/audio-alsa.c
parent785a37416c58fb6f86d3d89cbff240ce9f2d7e74 (diff)
Initial Audio plugin
Signed-off-by: Manuel Bachmann <manuel.bachmann@iot.bzh>
Diffstat (limited to 'plugins/audio/audio-alsa.c')
-rw-r--r--plugins/audio/audio-alsa.c82
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 (&params);
+ 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); */
+} \ No newline at end of file