1 files changed, 77 insertions, 0 deletions
diff --git a/libaudio/alsa_audio.h b/libaudio/alsa_audio.h
new file mode 100644
index 0000000..3cb86d9
--- /dev/null
+++ b/libaudio/alsa_audio.h
@@ -0,0 +1,77 @@
+/*
+** Copyright 2010, The Android Open-Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+#ifndef _AUDIO_H_
+#define _AUDIO_H_
+
+struct pcm;
+
+#define PCM_OUT        0x00000000
+#define PCM_IN         0x10000000
+
+#define PCM_STEREO     0x00000000
+#define PCM_MONO       0x01000000
+
+#define PCM_44100HZ    0x00000000
+#define PCM_48000HZ    0x00100000
+#define PCM_8000HZ     0x00200000
+#define PCM_RATE_MASK  0x00F00000
+
+#define PCM_PERIOD_CNT_MIN 2
+#define PCM_PERIOD_CNT_SHIFT 16
+#define PCM_PERIOD_CNT_MASK (0xF << PCM_PERIOD_CNT_SHIFT)
+#define PCM_PERIOD_SZ_MIN 128
+#define PCM_PERIOD_SZ_SHIFT 12
+#define PCM_PERIOD_SZ_MASK (0xF << PCM_PERIOD_SZ_SHIFT)
+
+/* Acquire/release a pcm channel.
+ * Returns non-zero on error
+ */
+struct pcm *pcm_open(unsigned flags);
+int pcm_close(struct pcm *pcm);
+int pcm_ready(struct pcm *pcm);
+
+/* Returns a human readable reason for the last error. */
+const char *pcm_error(struct pcm *pcm);
+
+/* Returns the buffer size (int bytes) that should be used for pcm_write.
+ * This will be 1/2 of the actual fifo size.
+ */
+unsigned pcm_buffer_size(struct pcm *pcm);
+
+/* Write data to the fifo.
+ * Will start playback on the first write or on a write that
+ * occurs after a fifo underrun.
+ */
+int pcm_write(struct pcm *pcm, void *data, unsigned count);
+int pcm_read(struct pcm *pcm, void *data, unsigned count);
+
+struct mixer;
+struct mixer_ctl;
+
+struct mixer *mixer_open(void);
+void mixer_close(struct mixer *mixer);
+void mixer_dump(struct mixer *mixer);
+
+struct mixer_ctl *mixer_get_control(struct mixer *mixer,
+                                    const char *name, unsigned index);
+struct mixer_ctl *mixer_get_nth_control(struct mixer *mixer, unsigned n);
+
+int mixer_ctl_set(struct mixer_ctl *ctl, unsigned percent);
+int mixer_ctl_select(struct mixer_ctl *ctl, const char *value);
+void mixer_ctl_print(struct mixer_ctl *ctl);
+
+#endif