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performance optimizations

This commit is contained in:
Šerif Rami 2025-10-14 17:51:09 +02:00
parent 4f08a0fb56
commit 88d48174eb
2 changed files with 36 additions and 20 deletions
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10
us144mkii_capture.c
View File

@ -122,22 +122,20 @@ static void decode_tascam_capture_block(const u8 *src_block, s32 *dst_block)
{
int frame, bit;
memset(dst_block, 0,
FRAMES_PER_DECODE_BLOCK * DECODED_CHANNELS_PER_FRAME *
DECODED_SAMPLE_SIZE);
for (frame = 0; frame < FRAMES_PER_DECODE_BLOCK; ++frame) {
const u8 *p_src_frame_base = src_block + frame * 64;
s32 *p_dst_frame = dst_block + frame * 4;
s32 ch[4] = { 0 };
for (bit = 0; bit < 24; ++bit) {
u8 byte1 = p_src_frame_base[bit];
u8 byte2 = p_src_frame_base[bit + 32];
ch[0] = (ch[0] << 1) | (byte1 & 1);
ch[2] = (ch[2] << 1) | ((byte1 >> 1) & 1);
}
for (bit = 0; bit < 24; ++bit) {
u8 byte2 = p_src_frame_base[bit + 32];
ch[1] = (ch[1] << 1) | (byte2 & 1);
ch[3] = (ch[3] << 1) | ((byte2 >> 1) & 1);

46
us144mkii_pcm.c
View File

@ -57,26 +57,44 @@ void process_playback_routing_us144mkii(struct tascam_card *tascam,
size_t frames)
{
size_t f;
const u8 *src_12, *src_34;
u8 *dst_line, *dst_digital;
/*
* If no routing is needed and the operation is in-place, we can
* skip everything.
*/
if (tascam->line_out_source == 0 && tascam->digital_out_source == 1 &&
src_buffer == dst_buffer)
return;
for (f = 0; f < frames; ++f) {
src_12 = src_buffer + f * BYTES_PER_FRAME;
src_34 = src_12 + (2 * BYTES_PER_SAMPLE);
dst_line = dst_buffer + f * BYTES_PER_FRAME;
dst_digital = dst_line + (2 * BYTES_PER_SAMPLE);
const u8 *frame_base = src_buffer + f * BYTES_PER_FRAME;
u8 *dst_frame_base = dst_buffer + f * BYTES_PER_FRAME;
/*
* Use a temporary buffer for the source frame to prevent data
* corruption during in-place routing operations.
*/
u8 temp_src_frame[BYTES_PER_FRAME];
const u8 *src_12;
const u8 *src_34;
memcpy(temp_src_frame, frame_base, BYTES_PER_FRAME);
src_12 = temp_src_frame;
src_34 = temp_src_frame + (2 * BYTES_PER_SAMPLE);
/* LINE OUTPUTS (ch1/2 on device) */
if (tascam->line_out_source == 0) /* "ch1 and ch2" */
memcpy(dst_line, src_12, 2 * BYTES_PER_SAMPLE);
else /* "ch3 and ch4" */
memcpy(dst_line, src_34, 2 * BYTES_PER_SAMPLE);
if (tascam->line_out_source == 0) /* "Playback 1-2" */
memcpy(dst_frame_base, src_12, 2 * BYTES_PER_SAMPLE);
else /* "Playback 3-4" */
memcpy(dst_frame_base, src_34, 2 * BYTES_PER_SAMPLE);
/* DIGITAL OUTPUTS (ch3/4 on device) */
if (tascam->digital_out_source == 0) /* "ch1 and ch2" */
memcpy(dst_digital, src_12, 2 * BYTES_PER_SAMPLE);
else /* "ch3 and ch4" */
memcpy(dst_digital, src_34, 2 * BYTES_PER_SAMPLE);
if (tascam->digital_out_source == 0) /* "Playback 1-2" */
memcpy(dst_frame_base + (2 * BYTES_PER_SAMPLE), src_12,
2 * BYTES_PER_SAMPLE);
else /* "Playback 3-4" */
memcpy(dst_frame_base + (2 * BYTES_PER_SAMPLE), src_34,
2 * BYTES_PER_SAMPLE);
}
}