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https://developer.apple.com/documentation/audiounit Apple has a number of audio frameworks we could use. This uses the Audio Unit framework, as it gives us most control over the rendering of the audio frames (such as being able to quickly pause / discard buffers). From some reading, we could implement niceties such as fading playback in and out while seeking over a short (10ms) period. This patch does not implement such fancy features though. Co-Authored-By: Andrew Kaster <akaster@serenityos.org>
49 lines
2.0 KiB
C++
49 lines
2.0 KiB
C++
/*
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* Copyright (c) 2023, Gregory Bertilson <zaggy1024@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "PlaybackStream.h"
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#include <AK/Platform.h>
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#include <LibCore/ThreadedPromise.h>
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#if defined(AK_OS_SERENITY)
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# include <LibAudio/PlaybackStreamSerenity.h>
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#elif defined(HAVE_PULSEAUDIO)
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# include <LibAudio/PlaybackStreamPulseAudio.h>
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#elif defined(AK_OS_MACOS)
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# include <LibAudio/PlaybackStreamAudioUnit.h>
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#endif
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namespace Audio {
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#define TRY_OR_REJECT_AND_STOP(expression, promise) \
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({ \
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auto&& __temporary_result = (expression); \
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if (__temporary_result.is_error()) [[unlikely]] { \
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(promise)->reject(__temporary_result.release_error()); \
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return 1; \
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} \
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__temporary_result.release_value(); \
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})
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ErrorOr<NonnullRefPtr<PlaybackStream>> PlaybackStream::create(OutputState initial_output_state, u32 sample_rate, u8 channels, u32 target_latency_ms, AudioDataRequestCallback&& data_request_callback)
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{
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VERIFY(data_request_callback);
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// Create the platform-specific implementation for this stream.
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#if defined(AK_OS_SERENITY)
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return PlaybackStreamSerenity::create(initial_output_state, sample_rate, channels, target_latency_ms, move(data_request_callback));
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#elif defined(HAVE_PULSEAUDIO)
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return PlaybackStreamPulseAudio::create(initial_output_state, sample_rate, channels, target_latency_ms, move(data_request_callback));
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#elif defined(AK_OS_MACOS)
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return PlaybackStreamAudioUnit::create(initial_output_state, sample_rate, channels, target_latency_ms, move(data_request_callback));
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#else
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(void)initial_output_state, (void)sample_rate, (void)channels, (void)target_latency_ms;
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return Error::from_string_literal("Audio output is not available for this platform");
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#endif
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}
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}
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