android/hal-audio: Add support to resume output stream

This patch adds support to resume output stream via Audio IPC.
Stream is automatically resumed on first write when stream is in
standby state.

diff --git a/android/hal-audio.c b/android/hal-audio.c
index 236d0c5..80128b6 100644 (file)
--- a/android/hal-audio.c
+++ b/android/hal-audio.c
@@ -415,6 +415,21 @@ static int ipc_close_stream_cmd(uint8_t endpoint_id)
        return result;
 }
 
+static int ipc_resume_stream_cmd(uint8_t endpoint_id)
+{
+       struct audio_cmd_resume_stream cmd;
+       int result;
+
+       DBG("");
+
+       cmd.id = endpoint_id;
+
+       result = audio_ipc_cmd(AUDIO_SERVICE_ID, AUDIO_OP_RESUME_STREAM,
+                               sizeof(cmd), &cmd, NULL, NULL, NULL);
+
+       return result;
+}
+
 static int register_endpoints(void)
 {
        struct audio_endpoint *ep = &audio_endpoints[0];
@@ -453,8 +468,26 @@ static void unregister_endpoints(void)
 static ssize_t out_write(struct audio_stream_out *stream, const void *buffer,
                                                                size_t bytes)
 {
-       DBG("");
-       return -ENOSYS;
+       struct a2dp_stream_out *out = (struct a2dp_stream_out *) stream;
+
+       /* We can auto-start only from standby */
+       if (out->audio_state == AUDIO_A2DP_STATE_STANDBY) {
+               DBG("stream in standby, auto-start");
+
+               if (ipc_resume_stream_cmd(out->ep->id) != AUDIO_STATUS_SUCCESS)
+                       return -1;
+
+               out->audio_state = AUDIO_A2DP_STATE_STARTED;
+       }
+
+       if (out->audio_state != AUDIO_A2DP_STATE_STARTED) {
+               DBG("stream not started");
+               return -1;
+       }
+
+       /* TODO: encode data using codec */
+
+       return bytes;
 }
 
 static uint32_t out_get_sample_rate(const struct audio_stream *stream)