1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_HARDWARE_STREAM_HAL_INTERFACE_H 18 #define ANDROID_HARDWARE_STREAM_HAL_INTERFACE_H 19 20 #include <vector> 21 22 #include <media/audiohal/EffectHalInterface.h> 23 #include <media/MicrophoneInfo.h> 24 #include <system/audio.h> 25 #include <utils/Errors.h> 26 #include <utils/RefBase.h> 27 #include <utils/String8.h> 28 29 namespace android { 30 31 class StreamHalInterface : public virtual RefBase 32 { 33 public: 34 // Return the sampling rate in Hz - eg. 44100. 35 virtual status_t getSampleRate(uint32_t *rate) = 0; 36 37 // Return size of input/output buffer in bytes for this stream - eg. 4800. 38 virtual status_t getBufferSize(size_t *size) = 0; 39 40 // Return the channel mask. 41 virtual status_t getChannelMask(audio_channel_mask_t *mask) = 0; 42 43 // Return the audio format - e.g. AUDIO_FORMAT_PCM_16_BIT. 44 virtual status_t getFormat(audio_format_t *format) = 0; 45 46 // Convenience method. 47 virtual status_t getAudioProperties( 48 uint32_t *sampleRate, audio_channel_mask_t *mask, audio_format_t *format) = 0; 49 50 // Set audio stream parameters. 51 virtual status_t setParameters(const String8& kvPairs) = 0; 52 53 // Get audio stream parameters. 54 virtual status_t getParameters(const String8& keys, String8 *values) = 0; 55 56 // Return the frame size (number of bytes per sample) of a stream. 57 virtual status_t getFrameSize(size_t *size) = 0; 58 59 // Add or remove the effect on the stream. 60 virtual status_t addEffect(sp<EffectHalInterface> effect) = 0; 61 virtual status_t removeEffect(sp<EffectHalInterface> effect) = 0; 62 63 // Put the audio hardware input/output into standby mode. 64 virtual status_t standby() = 0; 65 66 virtual status_t dump(int fd) = 0; 67 68 // Start a stream operating in mmap mode. 69 virtual status_t start() = 0; 70 71 // Stop a stream operating in mmap mode. 72 virtual status_t stop() = 0; 73 74 // Retrieve information on the data buffer in mmap mode. 75 virtual status_t createMmapBuffer(int32_t minSizeFrames, 76 struct audio_mmap_buffer_info *info) = 0; 77 78 // Get current read/write position in the mmap buffer 79 virtual status_t getMmapPosition(struct audio_mmap_position *position) = 0; 80 81 // Set the priority of the thread that interacts with the HAL 82 // (must match the priority of the audioflinger's thread that calls 'read' / 'write') 83 virtual status_t setHalThreadPriority(int priority) = 0; 84 85 protected: 86 // Subclasses can not be constructed directly by clients. 87 StreamHalInterface() {} 88 89 // The destructor automatically closes the stream. 90 virtual ~StreamHalInterface() {} 91 }; 92 93 class StreamOutHalInterfaceCallback : public virtual RefBase { 94 public: 95 virtual void onWriteReady() {} 96 virtual void onDrainReady() {} 97 virtual void onError() {} 98 99 protected: 100 StreamOutHalInterfaceCallback() {} 101 virtual ~StreamOutHalInterfaceCallback() {} 102 }; 103 104 class StreamOutHalInterface : public virtual StreamHalInterface { 105 public: 106 // Return the audio hardware driver estimated latency in milliseconds. 107 virtual status_t getLatency(uint32_t *latency) = 0; 108 109 // Use this method in situations where audio mixing is done in the hardware. 110 virtual status_t setVolume(float left, float right) = 0; 111 112 // Write audio buffer to driver. 113 virtual status_t write(const void *buffer, size_t bytes, size_t *written) = 0; 114 115 // Return the number of audio frames written by the audio dsp to DAC since 116 // the output has exited standby. 117 virtual status_t getRenderPosition(uint32_t *dspFrames) = 0; 118 119 // Get the local time at which the next write to the audio driver will be presented. 120 virtual status_t getNextWriteTimestamp(int64_t *timestamp) = 0; 121 122 // Set the callback for notifying completion of non-blocking write and drain. 123 // The callback must be owned by someone else. The output stream does not own it 124 // to avoid strong pointer loops. 125 virtual status_t setCallback(wp<StreamOutHalInterfaceCallback> callback) = 0; 126 127 // Returns whether pause and resume operations are supported. 128 virtual status_t supportsPauseAndResume(bool *supportsPause, bool *supportsResume) = 0; 129 130 // Notifies to the audio driver to resume playback following a pause. 131 virtual status_t pause() = 0; 132 133 // Notifies to the audio driver to resume playback following a pause. 134 virtual status_t resume() = 0; 135 136 // Returns whether drain operation is supported. 137 virtual status_t supportsDrain(bool *supportsDrain) = 0; 138 139 // Requests notification when data buffered by the driver/hardware has been played. 140 virtual status_t drain(bool earlyNotify) = 0; 141 142 // Notifies to the audio driver to flush the queued data. 143 virtual status_t flush() = 0; 144 145 // Return a recent count of the number of audio frames presented to an external observer. 146 virtual status_t getPresentationPosition(uint64_t *frames, struct timespec *timestamp) = 0; 147 148 struct SourceMetadata { 149 std::vector<playback_track_metadata_t> tracks; 150 }; 151 /** 152 * Called when the metadata of the stream's source has been changed. 153 * @param sourceMetadata Description of the audio that is played by the clients. 154 */ 155 virtual status_t updateSourceMetadata(const SourceMetadata& sourceMetadata) = 0; 156 157 protected: 158 virtual ~StreamOutHalInterface() {} 159 }; 160 161 class StreamInHalInterface : public virtual StreamHalInterface { 162 public: 163 // Set the input gain for the audio driver. 164 virtual status_t setGain(float gain) = 0; 165 166 // Read audio buffer in from driver. 167 virtual status_t read(void *buffer, size_t bytes, size_t *read) = 0; 168 169 // Return the amount of input frames lost in the audio driver. 170 virtual status_t getInputFramesLost(uint32_t *framesLost) = 0; 171 172 // Return a recent count of the number of audio frames received and 173 // the clock time associated with that frame count. 174 virtual status_t getCapturePosition(int64_t *frames, int64_t *time) = 0; 175 176 // Get active microphones 177 virtual status_t getActiveMicrophones(std::vector<media::MicrophoneInfo> *microphones) = 0; 178 179 struct SinkMetadata { 180 std::vector<record_track_metadata_t> tracks; 181 }; 182 /** 183 * Called when the metadata of the stream's sink has been changed. 184 * @param sinkMetadata Description of the audio that is suggested by the clients. 185 */ 186 virtual status_t updateSinkMetadata(const SinkMetadata& sinkMetadata) = 0; 187 188 protected: 189 virtual ~StreamInHalInterface() {} 190 }; 191 192 } // namespace android 193 194 #endif // ANDROID_HARDWARE_STREAM_HAL_INTERFACE_H 195
