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LibAudio: Add generic Audio::Loader class

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The Audio::Loader class is able to load different types of audio files
by using a generic plugin interface for all file formats. Every new
loader will have to derive from Audio::LoaderPlugin to provide a common
API.

This makes it easy to add support for more audio file formats in the future.
This commit is contained in:
Julian Offenhäuser 2020-12-01 19:55:41 +01:00 • committed by Andreas Kling
parent 0b086c759a
commit 1f47b01e3b
5 changed files with 161 additions and 19 deletions
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18
Libraries/LibAudio/WavLoader.cpp
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@ -33,7 +33,7 @@
namespace Audio {
WavLoader::WavLoader(const StringView& path)
WavLoaderPlugin::WavLoaderPlugin(const StringView& path)
: m_file(Core::File::construct(path))
{
if (!m_file->open(Core::IODevice::ReadOnly)) {
@ -41,13 +41,19 @@ WavLoader::WavLoader(const StringView& path)
return;
}
if (!parse_header())
valid = parse_header();
if (!valid)
return;
m_resampler = make<ResampleHelper>(m_sample_rate, 44100);
}
RefPtr<Buffer> WavLoader::get_more_samples(size_t max_bytes_to_read_from_input)
bool WavLoaderPlugin::sniff()
{
return valid;
}
RefPtr<Buffer> WavLoaderPlugin::get_more_samples(size_t max_bytes_to_read_from_input)
{
#ifdef AWAVLOADER_DEBUG
dbgln("Read WAV of format PCM with num_channels {} sample rate {}, bits per sample {}", m_num_channels, m_sample_rate, m_bits_per_sample);
@ -64,7 +70,7 @@ RefPtr<Buffer> WavLoader::get_more_samples(size_t max_bytes_to_read_from_input)
return buffer;
}
void WavLoader::seek(const int position)
void WavLoaderPlugin::seek(const int position)
{
if (position < 0 || position > m_total_samples)
return;
@ -73,12 +79,12 @@ void WavLoader::seek(const int position)
m_file->seek(position * m_num_channels * (m_bits_per_sample / 8));
}
void WavLoader::reset()
void WavLoaderPlugin::reset()
{
seek(0);
}
bool WavLoader::parse_header()
bool WavLoaderPlugin::parse_header()
{
Core::IODeviceStreamReader stream(*m_file);