AudioFlinger: Add datapath subproject
Test: ALLOW_LOCAL_TIDY_TRUE=1 mm -j .
Bug: 287521708
Merged-In: I1fbe85ff5c5fc58a3e49fa137b4247b33f919ecb
Change-Id: I1fbe85ff5c5fc58a3e49fa137b4247b33f919ecb
(cherry picked from commit 76913a08cba261ea59ca436ee99ff1ea3f2de6e8)
diff --git a/services/audioflinger/datapath/SpdifStreamOut.h b/services/audioflinger/datapath/SpdifStreamOut.h
new file mode 100644
index 0000000..c8dc89f
--- /dev/null
+++ b/services/audioflinger/datapath/SpdifStreamOut.h
@@ -0,0 +1,123 @@
+/*
+**
+** Copyright 2015, 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_SPDIF_STREAM_OUT_H
+#define ANDROID_SPDIF_STREAM_OUT_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <system/audio.h>
+
+#include "AudioStreamOut.h"
+
+#include <audio_utils/spdif/SPDIFEncoder.h>
+
+namespace android {
+
+/**
+ * Stream that is a PCM data burst in the HAL but looks like an encoded stream
+ * to the AudioFlinger. Wraps encoded data in an SPDIF wrapper per IEC61973-3.
+ */
+class SpdifStreamOut : public AudioStreamOut {
+public:
+
+ SpdifStreamOut(AudioHwDevice *dev, audio_output_flags_t flags,
+ audio_format_t format);
+
+ ~SpdifStreamOut() override = default;
+
+ status_t open(
+ audio_io_handle_t handle,
+ audio_devices_t devices,
+ struct audio_config *config,
+ const char *address) override;
+
+ /**
+ * Write audio buffer to driver. Returns number of bytes written, or a
+ * negative status_t. If at least one frame was written successfully prior to the error,
+ * it is suggested that the driver return that successful (short) byte count
+ * and then return an error in the subsequent call.
+ *
+ * If set_callback() has previously been called to enable non-blocking mode
+ * the write() is not allowed to block. It must write only the number of
+ * bytes that currently fit in the driver/hardware buffer and then return
+ * this byte count. If this is less than the requested write size the
+ * callback function must be called when more space is available in the
+ * driver/hardware buffer.
+ */
+ ssize_t write(const void* buffer, size_t bytes) override;
+
+ /**
+ * @return frame size from the perspective of the application and the AudioFlinger.
+ */
+ [[nodiscard]] size_t getFrameSize() const override { return sizeof(int8_t); }
+
+ /**
+ * @return format from the perspective of the application and the AudioFlinger.
+ */
+ [[nodiscard]] virtual audio_format_t getFormat() const { return mApplicationFormat; }
+
+ /**
+ * The HAL may be running at a higher sample rate if, for example, playing wrapped EAC3.
+ * @return sample rate from the perspective of the application and the AudioFlinger.
+ */
+ [[nodiscard]] virtual uint32_t getSampleRate() const { return mApplicationSampleRate; }
+
+ /**
+ * The HAL is in stereo mode when playing multi-channel compressed audio over HDMI.
+ * @return channel mask from the perspective of the application and the AudioFlinger.
+ */
+ [[nodiscard]] virtual audio_channel_mask_t getChannelMask() const {
+ return mApplicationChannelMask;
+ }
+
+ status_t flush() override;
+ status_t standby() override;
+
+private:
+
+ class MySPDIFEncoder : public SPDIFEncoder
+ {
+ public:
+ MySPDIFEncoder(SpdifStreamOut *spdifStreamOut, audio_format_t format)
+ : SPDIFEncoder(format)
+ , mSpdifStreamOut(spdifStreamOut)
+ {
+ }
+
+ ssize_t writeOutput(const void* buffer, size_t bytes) override
+ {
+ return mSpdifStreamOut->writeDataBurst(buffer, bytes);
+ }
+ protected:
+ SpdifStreamOut * const mSpdifStreamOut;
+ };
+
+ MySPDIFEncoder mSpdifEncoder;
+ audio_format_t mApplicationFormat = AUDIO_FORMAT_DEFAULT;
+ uint32_t mApplicationSampleRate = 0;
+ audio_channel_mask_t mApplicationChannelMask = AUDIO_CHANNEL_NONE;
+
+ ssize_t writeDataBurst(const void* data, size_t bytes);
+ ssize_t writeInternal(const void* buffer, size_t bytes);
+
+};
+
+} // namespace android
+
+#endif // ANDROID_SPDIF_STREAM_OUT_H