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65 lines
2.2 KiB
65 lines
2.2 KiB
// Copyright 2019 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CAST_STANDALONE_RECEIVER_SDL_AUDIO_PLAYER_H_
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#define CAST_STANDALONE_RECEIVER_SDL_AUDIO_PLAYER_H_
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#include <string>
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#include <vector>
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#include "cast/standalone_receiver/sdl_player_base.h"
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namespace openscreen {
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namespace cast {
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// Consumes frames from a Receiver, decodes them, and renders them to an
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// internally-owned SDL audio device.
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class SDLAudioPlayer final : public SDLPlayerBase {
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public:
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// |error_callback| is run only if a fatal error occurs, at which point the
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// player has halted and set |error_status()|.
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SDLAudioPlayer(ClockNowFunctionPtr now_function,
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TaskRunner* task_runner,
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Receiver* receiver,
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AudioCodec codec,
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std::function<void()> error_callback);
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~SDLAudioPlayer() final;
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private:
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// SDLPlayerBase implementation.
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ErrorOr<Clock::time_point> RenderNextFrame(
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const SDLPlayerBase::PresentableFrame& frame) final;
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bool RenderWhileIdle(const SDLPlayerBase::PresentableFrame* frame) final;
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void Present() final;
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// Maps an AVSampleFormat enum to the SDL_AudioFormat equivalent.
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static SDL_AudioFormat GetSDLAudioFormat(AVSampleFormat format);
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// The audio format determined by the last call to RenderCurrentFrame().
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SDL_AudioSpec pending_audio_spec_{};
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// The amount of time before a target presentation time to call Present(), to
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// account for audio buffering (the latency until samples reach the hardware).
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Clock::duration approximate_lead_time_{};
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// When the decoder provides planar data, this buffer is used for storing the
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// interleaved conversion.
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std::vector<uint8_t> interleaved_audio_buffer_;
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// Points to the memory containing the next chunk of interleaved audio.
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absl::Span<const uint8_t> pending_audio_;
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// The currently-open SDL audio device (or zero, if not open).
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SDL_AudioDeviceID device_ = 0;
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// The audio format being used by the currently-open SDL audio device.
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SDL_AudioSpec device_spec_{};
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};
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} // namespace cast
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} // namespace openscreen
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#endif // CAST_STANDALONE_RECEIVER_SDL_AUDIO_PLAYER_H_
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