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codec: Make lookup table static constexpr (#5572)

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Allows compilers to elide needing to push these values on the stack
every time the function is called.

Co-authored-by: Lioncash <mathew1800@gmail.com>
This commit is contained in:
Tobias 2020-12-07 16:05:45 +01:00 • committed by GitHub
parent 702af87f0d
commit f0e3637c7a
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2 changed files with 4 additions and 3 deletions
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5
src/audio_core/codec.cpp
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@ -21,8 +21,9 @@ StereoBuffer16 DecodeADPCM(const u8* const data, const std::size_t sample_count,
constexpr std::size_t FRAME_LEN = 8;
constexpr std::size_t SAMPLES_PER_FRAME = 14;
constexpr std::array<int, 16> SIGNED_NIBBLES = {
{0, 1, 2, 3, 4, 5, 6, 7, -8, -7, -6, -5, -4, -3, -2, -1}};
static constexpr std::array<int, 16> SIGNED_NIBBLES{
0, 1, 2, 3, 4, 5, 6, 7, -8, -7, -6, -5, -4, -3, -2, -1,
};
const std::size_t ret_size =
sample_count % 2 == 0 ? sample_count : sample_count + 1; // Ensure multiple of two.

2
src/audio_core/codec.h
View file

@ -25,7 +25,7 @@ struct ADPCMState {
* @param state ADPCM state, this is updated with new state
* @return Decoded stereo signed PCM16 data, sample_count in length
*/
StereoBuffer16 DecodeADPCM(const u8* const data, const std::size_t sample_count,
StereoBuffer16 DecodeADPCM(const u8* data, const std::size_t sample_count,
const std::array<s16, 16>& adpcm_coeff, ADPCMState& state);
/**