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Minor fixes for interleaved .vag loop points

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spicyjpeg
2025-12-05 02:26:01 +01:00
parent ae864bf940
commit d1bc6e2f5f
2 changed files with 12 additions and 8 deletions
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11
README.md
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@@ -80,17 +80,16 @@ Notes:
[.vag header](https://psx-spx.consoledev.net/cdromfileformats/#cdrom-file-audio-single-samples-vag-sony)
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 changing the signature
to `VAGi` and adding the following fields:
using the `-a` option (2048 bytes by default). The `vagi` format extends the
standard .vag header by adding 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`.
- The `spu`, `vag`, `spui` and `vagi` formats support setting a loop start
point. If the input file is either a .wav file with sampler metadata (`smpl`
- 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
driver. If the input file is either a .wav file with sampler metadata (`smpl`
chunk) or in a format FFmpeg supports parsing cue/chapter markers from, the
first marker will be used as the loop point by default. The `-l` and `-n`
options can be used to manually set a loop point or ignore the one present in

9
psxavenc/filefmt.c
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@@ -307,6 +307,8 @@ void encode_file_spui(const args_t *args, decoder_t *decoder, FILE *output) {
if (args->format == FORMAT_VAGI)
fseek(output, header_size, SEEK_SET);
else if (args->audio_loop_point >= 0 && !(args->flags & FLAG_QUIET))
fprintf(stderr, "Warning: ignoring loop point as there is no header to store it in\n");
int audio_state_size = sizeof(psx_audio_encoder_channel_state_t) * args->audio_channels;
psx_audio_encoder_channel_state_t *audio_state = malloc(audio_state_size);
@@ -342,12 +344,15 @@ void encode_file_spui(const args_t *args, decoder_t *decoder, FILE *output) {
if (length > 0) {
uint8_t *last_block = chunk_ptr + length - PSX_AUDIO_SPU_BLOCK_SIZE;
if (args->flags & FLAG_SPU_ENABLE_LOOP) {
if (
(args->flags & FLAG_SPU_ENABLE_LOOP) ||
(decoder->end_of_input && args->audio_loop_point >= 0)
) {
last_block[1] = PSX_AUDIO_SPU_LOOP_REPEAT;
} else if (decoder->end_of_input) {
// HACK: the trailing block should in theory be appended to
// the existing data, but it's easier to just zerofill and
// repurpose the last encoded block
// repurpose the last encoded block.
memset(last_block, 0, PSX_AUDIO_SPU_BLOCK_SIZE);
last_block[1] = PSX_AUDIO_SPU_LOOP_TRAP;
}