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LibAudio: Create a playback class with a PulseAudio implementation

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This adds an abstract `Audio::PlaybackStream` class to allow cross-
platform audio playback to be done in an opaque manner by applications
in both Serenity and Lagom.

Currently, the only supported audio API is PulseAudio, but a Serenity
implementation should be added shortly as well.
This commit is contained in:
Zaggy1024 2023-07-04 04:55:53 -05:00 • committed by Andrew Kaster
parent fe672989a9
commit bc4d4f0f95
9 changed files with 1041 additions and 0 deletions
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39
Userland/Libraries/LibAudio/PlaybackStream.cpp Normal file
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/*
* Copyright (c) 2023, Gregory Bertilson <zaggy1024@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "PlaybackStream.h"
#include <LibCore/ThreadedPromise.h>
#if defined(HAVE_PULSEAUDIO)
# include <LibAudio/PlaybackStreamPulseAudio.h>
#endif
namespace Audio {
#define TRY_OR_REJECT_AND_STOP(expression, promise) \
({ \
auto&& __temporary_result = (expression); \
if (__temporary_result.is_error()) [[unlikely]] { \
(promise)->reject(__temporary_result.release_error()); \
return 1; \
} \
__temporary_result.release_value(); \
})
ErrorOr<NonnullRefPtr<PlaybackStream>> PlaybackStream::create(OutputState initial_output_state, u32 sample_rate, u8 channels, u32 target_latency_ms, AudioDataRequestCallback&& data_request_callback)
{
VERIFY(data_request_callback);
// Create the platform-specific implementation for this stream.
#if defined(HAVE_PULSEAUDIO)
return PlaybackStreamPulseAudio::create(initial_output_state, sample_rate, channels, target_latency_ms, move(data_request_callback));
#else
(void)initial_output_state, (void)sample_rate, (void)channels, (void)target_latency_ms;
return Error::from_string_literal("Audio output is not available for this platform");
#endif
}
}