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Optimize PSX padding finder

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This commit is contained in:
bnnm 2021-07-08 22:16:43 +02:00
parent bbc55c2036
commit 6fb4178103
1 changed files with 30 additions and 15 deletions
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45
src/coding/psx_decoder.c
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@ -184,7 +184,7 @@ void decode_psx_configurable(VGMSTREAMCHANNEL* stream, sample_t* outbuf, int cha
}
/* PS-ADPCM from Pivotal games, exactly like psx_cfg but with float math (reverse engineered from the exe) */
void decode_psx_pivotal(VGMSTREAMCHANNEL * stream, sample_t * outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do, int frame_size) {
void decode_psx_pivotal(VGMSTREAMCHANNEL* stream, sample_t* outbuf, int channelspacing, int32_t first_sample, int32_t samples_to_do, int frame_size) {
uint8_t frame[0x50] = {0};
off_t frame_offset;
int i, frames_in, sample_count = 0;
@ -250,7 +250,7 @@ void decode_psx_pivotal(VGMSTREAMCHANNEL * stream, sample_t * outbuf, int channe
* - 0x7 (0111): End marker and don't decode
* - 0x8+(1NNN): Not valid
*/
static int ps_find_loop_offsets_internal(STREAMFILE *sf, off_t start_offset, size_t data_size, int channels, size_t interleave, int32_t * p_loop_start, int32_t * p_loop_end, int config) {
static int ps_find_loop_offsets_internal(STREAMFILE* sf, off_t start_offset, size_t data_size, int channels, size_t interleave, int32_t * p_loop_start, int32_t * p_loop_end, int config) {
int num_samples = 0, loop_start = 0, loop_end = 0;
int loop_start_found = 0, loop_end_found = 0;
off_t offset = start_offset;
@ -343,19 +343,22 @@ static int ps_find_loop_offsets_internal(STREAMFILE *sf, off_t start_offset, siz
return 0; /* no loop */
}
int ps_find_loop_offsets(STREAMFILE *sf, off_t start_offset, size_t data_size, int channels, size_t interleave, int32_t *p_loop_start, int32_t *p_loop_end) {
int ps_find_loop_offsets(STREAMFILE* sf, off_t start_offset, size_t data_size, int channels, size_t interleave, int32_t* p_loop_start, int32_t* p_loop_end) {
return ps_find_loop_offsets_internal(sf, start_offset, data_size, channels, interleave, p_loop_start, p_loop_end, 0);
}
int ps_find_loop_offsets_full(STREAMFILE *sf, off_t start_offset, size_t data_size, int channels, size_t interleave, int32_t *p_loop_start, int32_t *p_loop_end) {
int ps_find_loop_offsets_full(STREAMFILE* sf, off_t start_offset, size_t data_size, int channels, size_t interleave, int32_t* p_loop_start, int32_t* p_loop_end) {
return ps_find_loop_offsets_internal(sf, start_offset, data_size, channels, interleave, p_loop_start, p_loop_end, 1);
}
size_t ps_find_padding(STREAMFILE *streamFile, off_t start_offset, size_t data_size, int channels, size_t interleave, int discard_empty) {
off_t min_offset, offset;
size_t ps_find_padding(STREAMFILE* sf, off_t start_offset, size_t data_size, int channels, size_t interleave, int discard_empty) {
off_t min_offset, offset, read_offset = 0;
size_t frame_size = 0x10;
size_t padding_size = 0;
size_t interleave_consumed = 0;
uint8_t buf[0x8000];
int buf_pos = 0;
int bytes;
if (data_size == 0 || channels == 0 || (channels > 1 && interleave == 0))
@ -374,12 +377,22 @@ size_t ps_find_padding(STREAMFILE *streamFile, off_t start_offset, size_t data_s
uint8_t flag;
int is_empty = 0;
/* read in chunks to optimize (less SF rebuffering since we go in reverse) */
if (offset < read_offset || buf_pos <= 0) {
read_offset = offset - sizeof(buf);
if (read_offset < 0)
read_offset = 0; //?
bytes = read_streamfile(buf, read_offset, sizeof(buf), sf);
buf_pos = (bytes / frame_size * frame_size);
}
buf_pos -= frame_size;
offset -= frame_size;
f1 = read_32bitBE(offset+0x00,streamFile);
f2 = read_32bitBE(offset+0x04,streamFile);
f3 = read_32bitBE(offset+0x08,streamFile);
f4 = read_32bitBE(offset+0x0c,streamFile);
f1 = get_u32be(buf+buf_pos+0x00);
f2 = get_u32be(buf+buf_pos+0x04);
f3 = get_u32be(buf+buf_pos+0x08);
f4 = get_u32be(buf+buf_pos+0x0c);
flag = (f1 >> 16) & 0xFF;
if (f1 == 0 && f2 == 0 && f3 == 0 && f4 == 0)
@ -406,9 +419,11 @@ size_t ps_find_padding(STREAMFILE *streamFile, off_t start_offset, size_t data_s
if (interleave_consumed == interleave) {
interleave_consumed = 0;
offset -= interleave * (channels - 1);
buf_pos -= interleave * (channels - 1);
}
}
//;VGM_LOG("PSX PAD: total size %x\n", padding_size);
return padding_size;
}
@ -424,14 +439,14 @@ size_t ps_cfg_bytes_to_samples(size_t bytes, size_t frame_size, int channels) {
}
/* test PS-ADPCM frames for correctness */
int ps_check_format(STREAMFILE *streamFile, off_t offset, size_t max) {
int ps_check_format(STREAMFILE* sf, off_t offset, size_t max) {
off_t max_offset = offset + max;
if (max_offset > get_streamfile_size(streamFile))
max_offset = get_streamfile_size(streamFile);
if (max_offset > get_streamfile_size(sf))
max_offset = get_streamfile_size(sf);
while (offset < max_offset) {
uint8_t predictor = (read_8bit(offset+0x00,streamFile) >> 4) & 0x0f;
uint8_t flags = read_8bit(offset+0x01,streamFile);
uint8_t predictor = (read_8bit(offset+0x00,sf) >> 4) & 0x0f;
uint8_t flags = read_8bit(offset+0x01,sf);
if (predictor > 5 || flags > 7) {
return 0;