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LibAudio: Support 32 and 64-bit float WAV files

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LibAudio's WavLoader plugin for loading WAV files now supports loading
audio files with 32-bit float or 64-bit float samples.

By supporting these new non-int sample formats, Audio::Buffer now stores
the sample format (out of a list of supported formats) instead of the
raw bit depth. (The bit depth is easily calculated with
pcm_bits_per_sample)
This commit is contained in:
kleines Filmröllchen 2021-04-26 17:13:04 +02:00 • committed by Andreas Kling
parent 91c210c39a
commit 563cc17a50
5 changed files with 127 additions and 35 deletions
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12
Userland/Libraries/LibAudio/WavLoader.h
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, kleines Filmröllchen <malu.bertsch@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -19,6 +20,13 @@
namespace Audio {
class Buffer;
// defines for handling the WAV header data
#define WAVE_FORMAT_PCM 0x0001 // PCM
#define WAVE_FORMAT_IEEE_FLOAT 0x0003 // IEEE float
#define WAVE_FORMAT_ALAW 0x0006 // 8-bit ITU-T G.711 A-law
#define WAVE_FORMAT_MULAW 0x0007 // 8-bit ITU-T G.711 µ-law
#define WAVE_FORMAT_EXTENSIBLE 0xFFFE // Determined by SubFormat
// Parses a WAV file and produces an Audio::Buffer.
class WavLoaderPlugin : public LoaderPlugin {
public:
@ -39,7 +47,7 @@ public:
virtual int total_samples() override { return m_total_samples; }
virtual u32 sample_rate() override { return m_sample_rate; }
virtual u16 num_channels() override { return m_num_channels; }
virtual u16 bits_per_sample() override { return m_bits_per_sample; }
virtual PcmSampleFormat pcm_format() override { return m_sample_format; }
virtual RefPtr<Core::File> file() override { return m_file; }
private:
@ -53,7 +61,7 @@ private:
u32 m_sample_rate { 0 };
u16 m_num_channels { 0 };
u16 m_bits_per_sample { 0 };
PcmSampleFormat m_sample_format;
int m_loaded_samples { 0 };
int m_total_samples { 0 };