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Add atrac9_parse_config util

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This commit is contained in:
bnnm 2018-08-15 16:42:34 +02:00
parent f9f93e74e7
commit cab8605959
2 changed files with 33 additions and 0 deletions
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32
src/coding/atrac9_decoder.c
View File

@ -221,4 +221,36 @@ size_t atrac9_bytes_to_samples(size_t bytes, atrac9_codec_data *data) {
fail:
return 0;
}
int atrac9_parse_config(uint32_t atrac9_config, int *out_sample_rate, int *out_channels, size_t *out_frame_size) {
static const int sample_rate_table[16] = {
11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000,
44100, 48000, 64000, 88200, 96000,128000,176400,192000
};
static const int channel_table[8] = {
1, 2, 2, 6, 8, 4, 0, 0
};
uint32_t sync = (atrac9_config >> 24) & 0xff; /* 8b */
uint8_t sample_rate_index = (atrac9_config >> 20) & 0x0f; /* 4b */
uint8_t channels_index = (atrac9_config >> 17) & 0x07; /* 3b */
/* uint8_t validation bit = (atrac9_config >> 16) & 0x01; */ /* 1b */
size_t frame_size = (atrac9_config >> 5) & 0x7FF; /* 11b */
size_t superframe_index = (atrac9_config >> 3) & 0x3; /* 2b */
/* uint8_t unused = (atrac9_config >> 0) & 0x7);*/ /* 3b */
if (sync != 0xFE)
goto fail;
if (out_sample_rate)
*out_sample_rate = sample_rate_table[sample_rate_index];
if (out_channels)
*out_channels = channel_table[channels_index];
if (out_frame_size)
*out_frame_size = (frame_size+1) * (1 << superframe_index);
return 1;
fail:
return 0;
}
#endif

1
src/coding/coding.h
View File

@ -241,6 +241,7 @@ void reset_atrac9(VGMSTREAM *vgmstream);
void seek_atrac9(VGMSTREAM *vgmstream, int32_t num_sample);
void free_atrac9(atrac9_codec_data *data);
size_t atrac9_bytes_to_samples(size_t bytes, atrac9_codec_data *data);
int atrac9_parse_config(uint32_t atrac9_config, int *out_sample_rate, int *out_channels, size_t *out_frame_size);
#endif
#ifdef VGM_USE_CELT