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us144mkii
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working capture 

using correct decode func fixed capture. Needs more optimization to work in lower latency
This commit is contained in:
serifpersia 2025-07-17 20:34:58 +02:00
parent 10142e053c
commit 2b8520aff3
1 changed files with 23 additions and 17 deletions
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us144mkii.c
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@ -82,9 +82,9 @@ static int dev_idx;
#define FEEDBACK_ACCUMULATOR_SIZE 128
/* --- Capture Decoding Defines --- */
#define DECODED_CHANNELS_PER_FRAME 24
#define DECODED_CHANNELS_PER_FRAME 4
#define DECODED_SAMPLE_SIZE 4 /* 32-bit */
#define FRAMES_PER_DECODE_BLOCK 4
#define FRAMES_PER_DECODE_BLOCK 8
#define RAW_BYTES_PER_DECODE_BLOCK 512
/* --- Main Driver Data Structure --- */
@ -1065,30 +1065,36 @@ unlock_and_continue:
static void decode_tascam_capture_block(const u8 *src_block, s32 *dst_block)
{
int frame, bit_idx, ch_idx;
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 __le16 *p_src_frame = (const __le16 *)(src_block + (frame * (RAW_BYTES_PER_DECODE_BLOCK / FRAMES_PER_DECODE_BLOCK)));
s32 *p_dst_frame = dst_block + (frame * DECODED_CHANNELS_PER_FRAME);
const u8 *p_src_frame_base = src_block + frame * 64;
s32 *p_dst_frame = dst_block + frame * 4;
const __le16 *src_half_even_ch = p_src_frame;
const __le16 *src_half_odd_ch = p_src_frame + 32;
const u8 *p1 = p_src_frame_base;
const u8 *p2 = p_src_frame_base + 32;
for (bit_idx = 0; bit_idx < 24; ++bit_idx) {
u16 word_even = le16_to_cpu(src_half_even_ch[bit_idx]);
u16 word_odd = le16_to_cpu(src_half_odd_ch[bit_idx]);
s32 ch0 = 0, ch1 = 0, ch2 = 0, ch3 = 0;
for (ch_idx = 0; ch_idx < 12; ++ch_idx) {
p_dst_frame[ch_idx * 2] = (p_dst_frame[ch_idx * 2] << 1) | ((word_even >> ch_idx) & 1);
p_dst_frame[ch_idx * 2 + 1] = (p_dst_frame[ch_idx * 2 + 1] << 1) | ((word_odd >> ch_idx) & 1);
}
for (bit = 0; bit < 24; ++bit) {
u8 byte1 = p1[bit];
ch0 = (ch0 << 1) | (byte1 & 1);
ch2 = (ch2 << 1) | ((byte1 >> 1) & 1);
}
}
for (frame = 0; frame < FRAMES_PER_DECODE_BLOCK * DECODED_CHANNELS_PER_FRAME; ++frame)
dst_block[frame] <<= 8;
for (bit = 0; bit < 24; ++bit) {
u8 byte2 = p2[bit];
ch1 = (ch1 << 1) | (byte2 & 1);
ch3 = (ch3 << 1) | ((byte2 >> 1) & 1);
}
p_dst_frame[0] = ch0 << 8;
p_dst_frame[1] = ch1 << 8;
p_dst_frame[2] = ch2 << 8;
p_dst_frame[3] = ch3 << 8;
}
}
static void process_capture_data(struct tascam_card *tascam)