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/*
* Copyright (C) 2016 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.
*/
#pragma once
#include <memory>
#include "common/libs/utils/simulated_buffer.h"
#include "common/vsoc/lib/vsoc_audio_message.h"
#include "guest/hals/audio/legacy/audio_hal.h"
namespace cvd {
namespace {
static const int IN_BUFFER_BYTES = 4096;
}
class GceAudio;
// Defines static callback functions for generic_stream_in HAL interface.
class GceAudioInputStream : public audio_stream_in {
public:
// These methods are internal to the GCE audio implementation.
// Factory for new input streams.
static int Open(
GceAudio* dev, audio_io_handle_t handle,
audio_devices_t devices, const audio_config& config,
GceAudioInputStream** stream_in);
// Gets a description of this stream
gce_audio_message GetStreamDescriptor(
uint32_t stream_number, gce_audio_message::message_t event);
// audio_stream_in implementation. These definitions follow the ones
// in hardware/libhardware/include/hardware/audio.h
// Returns the sampling rate in Hz - eg. 44100.
uint32_t GetSampleRate() const { return config_.sample_rate; }
// Sets the sample rate
// no direct calls from JB and later, but called indirectly from
// GceAudio::SetStreamParamters when it finds
// AUDIO_PARAMETER_STREAM_SAMPLING_RATE
int SetSampleRate(uint32_t rate);
// Returns the size of input/output buffer in bytes for this stream - eg.
// 4800.
// It should be a multiple of the frame size. See also get_input_buffer_size
size_t GetBufferSize() const {
return IN_BUFFER_BYTES;
}
// Returns the channel mask -
// e.g. AUDIO_CHANNEL_OUT_STEREO or AUDIO_CHANNEL_IN_STEREO
audio_channel_mask_t GetChannels() const {
return config_.channel_mask;
}
// Returns the audio format - e.g. AUDIO_FORMAT_PCM_16_BIT
audio_format_t GetFormat() const {
return config_.format;
}
// Sets the audio format
// no direct calls from JB and later, but called indirectly from
// GceAudio::SetStreamParamters when it finds
// AUDIO_PARAMETER_STREAM_FORMAT
int SetFormat(audio_format_t format);
// Puts the audio hardware input/output into standby mode.
// Driver should exit from standby mode at the next I/O operation.
// Returns 0 on success and <0 on failure.
int Standby() { return 0; }
// Dumps the state of the audio input/output device
int Dump(int fd) const;
// Returns the set of device(s) which this stream is connected to
audio_devices_t GetDevice() const {
return device_;
}
// Sets the device this stream is connected to.
// no direct calls from JB and later, but called indirectly from
// GceAudio::SetStreamParamters when it finds
// AUDIO_PARAMETER_STREAM_ROUTING for both input and output.
// AUDIO_PARAMETER_STREAM_INPUT_SOURCE is an additional information used by
// input streams only.
int SetDevice(audio_devices_t device) { device_ = device; return 0; }
// sets audio stream parameters. The function accepts a list of
// parameter key value pairs in the form: key1=value1;key2=value2;...
//
// Some keys are reserved for standard parameters (See AudioParameter class)
//
// If the implementation does not accept a parameter change while
// the output is active but the parameter is acceptable otherwise, it must
// return -ENOSYS.
// The audio flinger will put the stream in standby and then change the
// parameter value.
// Uses GceAudio::SetStreamParameters
// Returns a pointer to a heap allocated string. The caller is responsible
// for freeing the memory for it using free().
char* GetParameters(const char* keys) const;
int AddAudioEffect(effect_handle_t /*effect*/) const {
return 0;
}
int RemoveAudioEffect(effect_handle_t /*effect*/) const {
return 0;
}
// Input stream specific methods
// Sets the input gain for the audio driver. This method is for
// for future use as of M.
int SetGain(float gain) {
gain_ = gain;
return 0;
}
// Reads audio buffer in from audio driver. Returns number of bytes read, or
// a negative android::status_t. If at least one frame was read prior to the error,
// read should return that byte count and then return an error in the
// subsequent call.
ssize_t Read(void* buffer, size_t bytes);
// Return the amount of input frames lost in the audio driver since the
// last call of this function.
// Audio driver is expected to reset the value to 0 and restart counting
// upon returning the current value by this function call.
// Such loss typically occurs when the user space process is blocked
// longer than the capacity of audio driver buffers.
//
// Unit: the number of input audio frames
uint32_t GetInputFramesLost() {
int64_t cur_lost_frames = buffer_model_->GetLostInputItems();
uint32_t rval = cur_lost_frames - reported_lost_frames_;
reported_lost_frames_ = cur_lost_frames;
return rval;
}
private:
GceAudioInputStream(cvd::GceAudio* dev, audio_devices_t devices,
const audio_config& config);
std::unique_ptr<SimulatedInputBuffer> buffer_model_;
cvd::GceAudio *dev_;
audio_config config_;
float gain_;
audio_devices_t device_;
size_t frame_size_;
int64_t reported_lost_frames_;
};
}
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