123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104 |
- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef MEDIA_AUDIO_ALSA_ALSA_INPUT_H_
- #define MEDIA_AUDIO_ALSA_ALSA_INPUT_H_
- #include <alsa/asoundlib.h>
- #include <stdint.h>
- #include <memory>
- #include <string>
- #include "base/compiler_specific.h"
- #include "base/memory/raw_ptr.h"
- #include "base/memory/weak_ptr.h"
- #include "base/threading/thread.h"
- #include "base/time/time.h"
- #include "media/audio/agc_audio_stream.h"
- #include "media/audio/audio_io.h"
- #include "media/base/audio_parameters.h"
- namespace media {
- class AlsaWrapper;
- class AudioManagerBase;
- // Provides an input stream for audio capture based on the ALSA PCM interface.
- // This object is not thread safe and all methods should be invoked in the
- // thread that created the object.
- class MEDIA_EXPORT AlsaPcmInputStream
- : public AgcAudioStream<AudioInputStream> {
- public:
- // Pass this to the constructor if you want to attempt auto-selection
- // of the audio recording device.
- static const char kAutoSelectDevice[];
- // Create a PCM Output stream for the ALSA device identified by
- // |device_name|. If unsure of what to use for |device_name|, use
- // |kAutoSelectDevice|.
- AlsaPcmInputStream(AudioManagerBase* audio_manager,
- const std::string& device_name,
- const AudioParameters& params,
- AlsaWrapper* wrapper);
- AlsaPcmInputStream(const AlsaPcmInputStream&) = delete;
- AlsaPcmInputStream& operator=(const AlsaPcmInputStream&) = delete;
- ~AlsaPcmInputStream() override;
- // Implementation of AudioInputStream.
- OpenOutcome Open() override;
- void Start(AudioInputCallback* callback) override;
- void Stop() override;
- void Close() override;
- double GetMaxVolume() override;
- void SetVolume(double volume) override;
- double GetVolume() override;
- bool IsMuted() override;
- void SetOutputDeviceForAec(const std::string& output_device_id) override;
- private:
- // Logs the error and invokes any registered callbacks.
- void HandleError(const char* method, int error);
- // Reads one or more buffers of audio from the device, passes on to the
- // registered callback and schedules the next read.
- void ReadAudio();
- // Recovers from any device errors if possible.
- bool Recover(int error);
- // Set |running_| to false on |capture_thread_|.
- void StopRunningOnCaptureThread();
- // Non-refcounted pointer back to the audio manager.
- // The AudioManager indirectly holds on to stream objects, so we don't
- // want circular references. Additionally, stream objects live on the audio
- // thread, which is owned by the audio manager and we don't want to addref
- // the manager from that thread.
- raw_ptr<AudioManagerBase> audio_manager_;
- std::string device_name_;
- AudioParameters params_;
- int bytes_per_buffer_;
- raw_ptr<AlsaWrapper> wrapper_;
- base::TimeDelta buffer_duration_; // Length of each recorded buffer.
- raw_ptr<AudioInputCallback> callback_; // Valid during a recording session.
- base::TimeTicks next_read_time_; // Scheduled time for next read callback.
- raw_ptr<snd_pcm_t>
- device_handle_; // Handle to the ALSA PCM recording device.
- raw_ptr<snd_mixer_t> mixer_handle_; // Handle to the ALSA microphone mixer.
- raw_ptr<snd_mixer_elem_t>
- mixer_element_handle_; // Handle to the capture element.
- // Buffer used for reading audio data.
- std::unique_ptr<uint8_t[]> audio_buffer_;
- bool read_callback_behind_schedule_;
- std::unique_ptr<AudioBus> audio_bus_;
- base::Thread capture_thread_;
- bool running_;
- };
- } // namespace media
- #endif // MEDIA_AUDIO_ALSA_ALSA_INPUT_H_
|