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Flip loop point endianness, add notes to README

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spicyjpeg
2025-12-05 08:57:13 +01:00
parent d1bc6e2f5f
commit 9a22336cec
2 changed files with 12 additions and 10 deletions
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9
README.md
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@@ -81,11 +81,14 @@ Notes:
at the beginning of the file. The header is always 48 bytes long for `vag`
files, while in the case of `vagi` files it is padded to the size specified
using the `-a` option (2048 bytes by default). The `vagi` format extends the
standard .vag header by adding the following fields:
header with the following fields:
- the file's interleave size at offset `0x08-0x0B` (little endian);
- the loop start offset in bytes-per-channel, if any, at offset `0x14-0x17`
(little endian);
- the file's channel count at offset `0x1E`.
(big endian). *Note that this field is specific to psxavenc and not part of*
*the standard interleaved .vag header*;
- the file's channel count at offset `0x1E`. *This field is not part of the*
*interleaved .vag header either, but can be found in other variants of the*
*format.*
- The `spu` and `vag` formats support encoding a loop point as part of the ADPCM
data, while `vagi` supports storing one in the header for use by the stream

13
psxavenc/filefmt.c
View File

@@ -131,7 +131,7 @@ static void write_vag_header(const args_t *args, int size_per_channel, uint8_t *
header[0x12] = (uint8_t)(args->audio_frequency >> 8);
header[0x13] = (uint8_t)args->audio_frequency;
// Loop point in bytes (little endian, non-standard)
// Loop point in bytes (big endian, non-standard)
if (args->format == FORMAT_VAGI && args->audio_loop_point >= 0) {
int loop_start_block = (args->audio_loop_point * args->audio_frequency) / (PSX_AUDIO_SPU_SAMPLES_PER_BLOCK * 1000);
@@ -139,15 +139,14 @@ static void write_vag_header(const args_t *args, int size_per_channel, uint8_t *
loop_start_block++;
int loop_point = loop_start_block * PSX_AUDIO_SPU_BLOCK_SIZE;
header[0x14] = (uint8_t)loop_point;
header[0x15] = (uint8_t)(loop_point >> 8);
header[0x16] = (uint8_t)(loop_point >> 16);
header[0x17] = (uint8_t)(loop_point >> 24);
header[0x14] = (uint8_t)(loop_point >> 24);
header[0x15] = (uint8_t)(loop_point >> 16);
header[0x16] = (uint8_t)(loop_point >> 8);
header[0x17] = (uint8_t)loop_point;
}
// Number of channels (little endian, non-standard)
// Number of channels (non-standard)
header[0x1E] = (uint8_t)args->audio_channels;
header[0x1F] = 0x00;
// Filename
int name_offset = strlen(args->output_file);