1 files changed, 83 insertions, 0 deletions
diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h
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+++ b/include/private/media/AudioTrackShared.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2007 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 ANDROID_AUDIO_TRACK_SHARED_H
+#define ANDROID_AUDIO_TRACK_SHARED_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <utils/threads.h>
+
+namespace android {
+
+// ----------------------------------------------------------------------------
+
+#define MAX_SAMPLE_RATE     65535
+#define THREAD_PRIORITY_AUDIO_CLIENT (ANDROID_PRIORITY_AUDIO)
+// Maximum cumulated timeout milliseconds before restarting audioflinger thread
+#define MAX_STARTUP_TIMEOUT_MS  3000    // Longer timeout period at startup to cope with A2DP init time
+#define MAX_RUN_TIMEOUT_MS      1000
+#define WAIT_PERIOD_MS          10
+
+
+struct audio_track_cblk_t
+{
+
+    // The data members are grouped so that members accessed frequently and in the same context
+    // are in the same line of data cache.
+                Mutex       lock;
+                Condition   cv;
+    volatile    uint32_t    user;
+    volatile    uint32_t    server;
+                uint32_t    userBase;
+                uint32_t    serverBase;
+    void*       buffers;
+    uint32_t    frameCount;
+    // Cache line boundary
+    uint32_t    loopStart;
+    uint32_t    loopEnd;
+    int         loopCount;
+    volatile    union {
+                    uint16_t    volume[2];
+                    uint32_t    volumeLR;
+                };
+                uint16_t    sampleRate;
+                uint16_t    channels;
+                int16_t     flowControlFlag; // underrun (out) or overrrun (in) indication
+                uint8_t     out;        // out equals 1 for AudioTrack and 0 for AudioRecord
+                uint8_t     forceReady; 
+                uint16_t    bufferTimeoutMs; // Maximum cumulated timeout before restarting audioflinger
+                uint16_t    waitTimeMs;      // Cumulated wait time
+                // Padding ensuring that data buffer starts on a cache line boundary (32 bytes). 
+                // See AudioFlinger::TrackBase constructor
+                int32_t     Padding[3];
+                
+                            audio_track_cblk_t();
+                uint32_t    stepUser(uint32_t frameCount);
+                bool        stepServer(uint32_t frameCount);
+                void*       buffer(uint32_t offset) const;
+                uint32_t    framesAvailable();
+                uint32_t    framesAvailable_l();
+                uint32_t    framesReady();
+};
+
+
+// ----------------------------------------------------------------------------
+
+}; // namespace android
+
+#endif // ANDROID_AUDIO_TRACK_SHARED_H