/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define WAVPACK_BLOCK_SIZE 4096
typedef struct {
// char ckID [4]; // "wvpk"
uint32_t ckSize; // size of entire block (minus 8, of course)
uint16_t version; // 0x402 to 0x410 are currently valid for decode
u_char track_no; // track number (0 if not used, like now)
u_char index_no; // track sub-index (0 if not used, like now)
uint32_t total_samples; // total samples for entire file, but this is
// only valid if block_index == 0 and a value of
// -1 indicates unknown length
uint32_t block_index; // index of first sample in block relative to
// beginning of file (normally this would start
// at 0 for the first block)
uint32_t block_samples; // number of samples in this block (0 = no audio)
uint32_t flags; // various flags for id and decoding
uint32_t crc; // crc for actual decoded data
} WavpackHeader;
typedef struct {
unsigned short FormatTag, NumChannels;
uint32_t SampleRate, BytesPerSecond;
unsigned short BlockAlign, BitsPerSample;
} WaveHeader3;
typedef struct {
// char ckID [4];
int32_t ckSize;
short version;
short bits; // added for version 2.00
short flags, shift; // added for version 3.00
int32_t total_samples; //, crc, crc2;
// char extension [4], extra_bc, extras [3];
} WavpackHeader3;
typedef struct wvpinfo {
PerlIO *infile;
char *file;
Buffer *buf;
HV *info;
off_t file_size;
off_t file_offset;
off_t audio_offset;
WavpackHeader *header; // current block header data
uint8_t seeking; // flag if we're seeking
} wvpinfo;
const int wavpack_sample_rates[] = {
6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 64000, 88200, 96000, 192000
};
#define ID_UNIQUE 0x3f
#define ID_OPTIONAL_DATA 0x20
#define ID_ODD_SIZE 0x40
#define ID_LARGE 0x80
#define ID_DUMMY 0x0
#define ID_ENCODER_INFO 0x1
#define ID_DECORR_TERMS 0x2
#define ID_DECORR_WEIGHTS 0x3
#define ID_DECORR_SAMPLES 0x4
#define ID_ENTROPY_VARS 0x5
#define ID_HYBRID_PROFILE 0x6
#define ID_SHAPING_WEIGHTS 0x7
#define ID_FLOAT_INFO 0x8
#define ID_INT32_INFO 0x9
#define ID_WV_BITSTREAM 0xa
#define ID_WVC_BITSTREAM 0xb
#define ID_WVX_BITSTREAM 0xc
#define ID_CHANNEL_INFO 0xd
#define ID_RIFF_HEADER (ID_OPTIONAL_DATA | 0x1)
#define ID_RIFF_TRAILER (ID_OPTIONAL_DATA | 0x2)
#define ID_REPLAY_GAIN (ID_OPTIONAL_DATA | 0x3) // never used (APEv2)
#define ID_CUESHEET (ID_OPTIONAL_DATA | 0x4) // never used (APEv2)
#define ID_CONFIG_BLOCK (ID_OPTIONAL_DATA | 0x5)
#define ID_MD5_CHECKSUM (ID_OPTIONAL_DATA | 0x6)
#define ID_SAMPLE_RATE (ID_OPTIONAL_DATA | 0x7)
static int get_wavpack_info(PerlIO *infile, char *file, HV *info);
wvpinfo * _wavpack_parse(PerlIO *infile, char *file, HV *info, uint8_t seeking);
int _wavpack_parse_block(wvpinfo *wvp);
int _wavpack_parse_sample_rate(wvpinfo *wvp, uint32_t size);
int _wavpack_parse_channel_info(wvpinfo *wvp, uint32_t size);
void _wavpack_skip(wvpinfo *wvp, uint32_t size);
int _wavpack_parse_old(wvpinfo *wvp);