Add support for playing audio during bootanimation

The bootanimation daemon will play 16 bit WAV files contained in bootanimation.zip
For this to work, the bootanimation.zip must contain an audio_conf.txt file,
which contains parameters to be used for the tinyalsa pcm_open call
as well as mixer parameters to set before attempting to play the sound.

If the bootanimation finds an audio_conf.txt file, then it will look for a file named
"audio.wav" in each of the part subdirectories. If audio.wav is found, it will play that
WAV file starting at the beginning of that part.

The code for this is based on the tinyplay utility in tinyalsa.

The audio_conf.txt and must begin with the following header:

card=<ALSA card number>
device=<ALSA device number>
period_size=<period size>
period_count=<period count>

This header is followed by zero or more mixer settings, each with the format:
mixer "<name>" = <value list>
Since mixer names can contain spaces, the name must be enclosed in double quotes.
The values in the value list can be integers, booleans (represented by 0 or 1)
or strings for enum values.

Finally I should mention that this change is not the right approach.
Instead of going straight to ALSA we should be using the mediaserver instead.
But mediaserver isn't ready in time due to interactions with the system server, and there
isn't time to fix this for the current release. We need to fix that for the next one.

Bug: 17674304

Change-Id: Ic391ade61c941d0a24f4d64fe005ac9375a23fa9

1 files changed, 47 insertions, 0 deletions

diff --git a/cmds/bootanimation/AudioPlayer.h b/cmds/bootanimation/AudioPlayer.h
new file mode 100644
index 0000000..7e82a07
--- /dev/null
+++ b/cmds/bootanimation/AudioPlayer.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2014 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 _BOOTANIMATION_AUDIOPLAYER_H
+#define _BOOTANIMATION_AUDIOPLAYER_H
+
+#include <utils/Thread.h>
+
+namespace android {
+
+class AudioPlayer : public Thread
+{
+public:
+                AudioPlayer();
+    virtual     ~AudioPlayer();
+    bool        init(const char* config);
+
+    void        playFile(struct FileMap* fileMap);
+
+private:
+    virtual bool        threadLoop();
+
+private:
+    int                 mCard;      // ALSA card to use
+    int                 mDevice;    // ALSA device to use
+    int                 mPeriodSize;
+    int                 mPeriodCount;
+
+    struct FileMap*     mCurrentFile;
+};
+
+} // namespace android
+
+#endif // _BOOTANIMATION_AUDIOPLAYER_H