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LibAudio: Alow creating a Buffer from a FixedArray

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A FixedArray, due to its non-allocation guarantee, is great for audio
programming, so it's natural to have it interface with Buffer.
This commit is contained in:
kleines Filmröllchen 2021-12-17 18:40:53 +01:00 • committed by Andreas Kling
parent 59601b67a0
commit 30130904f5
1 changed files with 19 additions and 5 deletions
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24
Userland/Libraries/LibAudio/Buffer.h
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@ -9,6 +9,7 @@
#include <AK/ByteBuffer.h>
#include <AK/Error.h>
#include <AK/FixedArray.h>
#include <AK/MemoryStream.h>
#include <AK/NonnullRefPtr.h>
#include <AK/RefPtr.h>
@ -77,6 +78,10 @@ public:
{
return adopt_nonnull_ref_or_enomem(new (nothrow) Buffer(move(samples)));
}
static ErrorOr<NonnullRefPtr<Buffer>> create_with_samples(FixedArray<Sample>&& samples)
{
return adopt_nonnull_ref_or_enomem(new (nothrow) Buffer(move(samples)));
}
static ErrorOr<NonnullRefPtr<Buffer>> create_with_anonymous_buffer(Core::AnonymousBuffer buffer, i32 buffer_id, int sample_count)
{
return adopt_nonnull_ref_or_enomem(new (nothrow) Buffer(move(buffer), buffer_id, sample_count));
@ -84,18 +89,27 @@ public:
static NonnullRefPtr<Buffer> create_empty()
{
// If we can't allocate an empty buffer, things are in a very bad state.
return MUST(adopt_nonnull_ref_or_enomem(new (nothrow) Buffer({})));
return MUST(adopt_nonnull_ref_or_enomem(new (nothrow) Buffer(FixedArray<Sample> {})));
}
const Sample* samples() const { return (const Sample*)data(); }
Sample const* samples() const { return (const Sample*)data(); }
int sample_count() const { return m_sample_count; }
const void* data() const { return m_buffer.data<void>(); }
void const* data() const { return m_buffer.data<void>(); }
int size_in_bytes() const { return m_sample_count * (int)sizeof(Sample); }
int id() const { return m_id; }
const Core::AnonymousBuffer& anonymous_buffer() const { return m_buffer; }
Core::AnonymousBuffer const& anonymous_buffer() const { return m_buffer; }
private:
explicit Buffer(const Vector<Sample> samples)
explicit Buffer(Vector<Sample>&& samples)
// FIXME: AnonymousBuffers can't be empty, so even for empty buffers we create a buffer of size 1 here,
// although the sample count is set to 0 to mark this.
: m_buffer(Core::AnonymousBuffer::create_with_size(max(samples.size(), 1) * sizeof(Sample)).release_value())
, m_id(allocate_id())
, m_sample_count(samples.size())
{
memcpy(m_buffer.data<void>(), samples.data(), samples.size() * sizeof(Sample));
}
explicit Buffer(FixedArray<Sample>&& samples)
// FIXME: AnonymousBuffers can't be empty, so even for empty buffers we create a buffer of size 1 here,
// although the sample count is set to 0 to mark this.
: m_buffer(Core::AnonymousBuffer::create_with_size(max(samples.size(), 1) * sizeof(Sample)).release_value())