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externals: Add option to use system SoundTouch (#6971)

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SachinVin 2023-09-17 03:16:32 +05:30 • committed by GitHub
parent d2d37411bc
commit 8aee625a14
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5 changed files with 84 additions and 7 deletions
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43
src/audio_core/time_stretch.cpp
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@ -5,7 +5,10 @@
#include <algorithm>
#include <cmath>
#include <cstddef>
#include <limits>
#include <memory>
#include <type_traits>
#include <vector>
#include <SoundTouch.h>
#include "audio_core/audio_types.h"
#include "audio_core/time_stretch.h"
@ -62,8 +65,44 @@ std::size_t TimeStretcher::Process(const s16* in, std::size_t num_in, s16* out,
LOG_TRACE(Audio, "{:5}/{:5} ratio:{:0.6f} backlog:{:0.6f}", num_in, num_out, stretch_ratio,
backlog_fullness);
sound_touch->putSamples(in, static_cast<u32>(num_in));
return sound_touch->receiveSamples(out, static_cast<u32>(num_out));
if constexpr (std::is_floating_point<soundtouch::SAMPLETYPE>()) {
// The SoundTouch library on most systems expects float samples
// use this vector to store input if soundtouch::SAMPLETYPE is a float
std::vector<soundtouch::SAMPLETYPE> float_in(2 * num_in);
std::vector<soundtouch::SAMPLETYPE> float_out(2 * num_out);
for (std::size_t i = 0; i < (2 * num_in); i++) {
// Conventional integer PCM uses a range of -32768 to 32767,
// but float samples use -1 to 1
// As a result we need to scale sample values during conversion
const float temp = static_cast<float>(in[i]) / std::numeric_limits<s16>::max();
float_in[i] = static_cast<soundtouch::SAMPLETYPE>(temp);
}
sound_touch->putSamples(float_in.data(), static_cast<u32>(num_in));
const std::size_t samples_received =
sound_touch->receiveSamples(float_out.data(), static_cast<u32>(num_out));
// Converting output samples back to shorts so we can use them
for (std::size_t i = 0; i < (2 * num_out); i++) {
const s16 temp = static_cast<s16>(float_out[i] * std::numeric_limits<s16>::max());
out[i] = temp;
}
return samples_received;
} else if (std::is_same<soundtouch::SAMPLETYPE, s16>()) {
// Use reinterpret_cast to workaround compile error when SAMPLETYPE is float.
sound_touch->putSamples(reinterpret_cast<const soundtouch::SAMPLETYPE*>(in),
static_cast<u32>(num_in));
return sound_touch->receiveSamples(reinterpret_cast<soundtouch::SAMPLETYPE*>(out),
static_cast<u32>(num_out));
} else {
static_assert(std::is_floating_point<soundtouch::SAMPLETYPE>() ||
std::is_same<soundtouch::SAMPLETYPE, s16>());
UNREACHABLE_MSG("Invalid SAMPLETYPE {}", typeid(soundtouch::SAMPLETYPE).name());
return 0;
}
}
void TimeStretcher::Clear() {