aaru-dps/Aaru.Compression.Native
1
0
Fork 0
mirror of https://github.com/aaru-dps/Aaru.Compression.Native.git synced 2025-12-16 19:24:31 +00:00
Code Issues Packages Projects Releases Wiki Activity

Optimize FLAC decoding.

Browse Source
This commit is contained in:
Natalia Portillo
2021-10-20 03:37:02 +01:00
parent a6fce35a2c
commit f677b716f0
1 changed files with 16 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
flac.c
View File

@@ -88,20 +88,31 @@ static FLAC__StreamDecoderReadStatus
static FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder* decoder,
const FLAC__Frame* frame,
const FLAC__int32* const bufffer[],
const FLAC__int32* const buffer[],
void* client_data)
{
aaru_flac_ctx* ctx = (aaru_flac_ctx*)client_data;
size_t i;
uint16_t* buffer16 = (uint16_t*)(ctx->dst_buffer + ctx->dst_pos);
// Why FLAC does not interleave the channels as PCM do, oh the mistery, we could use memcpy instead of looping
for(i = 0; i < frame->header.blocksize && ctx->dst_pos < ctx->dst_len; i++)
{
// Left channel
ctx->dst_buffer[ctx->dst_pos++] = (FLAC__uint16)(FLAC__int16)bufffer[0][i];
ctx->dst_buffer[ctx->dst_pos++] = (FLAC__uint16)(FLAC__int16)bufffer[0][i] >> 8;
*(buffer16++) = (FLAC__int16)buffer[0][i];
// Right channel
ctx->dst_buffer[ctx->dst_pos++] = (FLAC__uint16)(FLAC__int16)bufffer[1][i];
ctx->dst_buffer[ctx->dst_pos++] = (FLAC__uint16)(FLAC__int16)bufffer[1][i] >> 8;
*(buffer16++) = (FLAC__int16)buffer[1][i];
ctx->dst_pos += 4;
/* TODO: Big-endian (use bswap?)
// Left channel
ctx->dst_buffer[ctx->dst_pos++] = (FLAC__uint16)(FLAC__int16)buffer[0][i];
ctx->dst_buffer[ctx->dst_pos++] = (FLAC__uint16)(FLAC__int16)buffer[0][i] >> 8;
// Right channel
ctx->dst_buffer[ctx->dst_pos++] = (FLAC__uint16)(FLAC__int16)buffer[1][i];
ctx->dst_buffer[ctx->dst_pos++] = (FLAC__uint16)(FLAC__int16)buffer[1][i] >> 8;
*/
}
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;