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////////////////////////////////////////////////////////////////////////////
// **** WAVPACK **** //
// Hybrid Lossless Wavefile Compressor //
// Copyright (c) 1998 - 2006 Conifer Software. //
// All Rights Reserved. //
// Distributed under the BSD Software License (see license.txt) //
////////////////////////////////////////////////////////////////////////////
// wputils.c
// This module provides a high-level interface to reading and writing WavPack
// files. WavPack input files can be opened as standard "C" streams using a
// provided filename. However, an alternate entry uses stream-reading
// callbacks to make using another file I/O method easy. Note that in this
// case the user application is responsible for finding and opening the .wvc
// file if the use of them is desired.
// For writing WavPack files there are no I/O routines used; a callback for
// writing completed blocks is provided.
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <math.h>
#include <sys/stat.h>
#if defined (WIN32) || defined (__OS2__)
#include <io.h>
#endif
#ifndef LIBWAVPACK_VERSION_STRING
#include "wavpack_version.h"
#endif
#include "wavpack_local.h"
#ifdef WIN32
#define stricmp(x,y) _stricmp(x,y)
#define fileno _fileno
#else
#define stricmp(x,y) strcasecmp(x,y)
#endif
#ifdef DEBUG_ALLOC
#define malloc malloc_db
#define realloc realloc_db
#define free free_db
void *malloc_db (uint32_t size);
void *realloc_db (void *ptr, uint32_t size);
void free_db (void *ptr);
int32_t dump_alloc (void);
#endif
static void free_streams (WavpackContext *wpc);
///////////////////////////// local table storage ////////////////////////////
static const uint32_t sample_rates [] = { 6000, 8000, 9600, 11025, 12000, 16000, 22050,
24000, 32000, 44100, 48000, 64000, 88200, 96000, 192000 };
///////////////////////////// executable code ////////////////////////////////
#if !defined(NO_UNPACK) || defined(INFO_ONLY)
static uint32_t read_next_header (WavpackStreamReader *reader, void *id, WavpackHeader *wphdr);
static uint32_t seek_final_index (WavpackStreamReader *reader, void *id);
static int read_wvc_block (WavpackContext *wpc);
// This code provides an interface between the reader callback mechanism that
// WavPack uses internally and the standard fstream C library.
#ifndef NO_USE_FSTREAMS
static int32_t read_bytes (void *id, void *data, int32_t bcount)
{
return (int32_t) fread (data, 1, bcount, (FILE*) id);
}
static uint32_t get_pos (void *id)
{
return ftell ((FILE*) id);
}
static int set_pos_abs (void *id, uint32_t pos)
{
return fseek (id, pos, SEEK_SET);
}
static int set_pos_rel (void *id, int32_t delta, int mode)
{
return fseek (id, delta, mode);
}
static int push_back_byte (void *id, int c)
{
return ungetc (c, id);
}
static uint32_t get_length (void *id)
{
FILE *file = id;
struct stat statbuf;
if (!file || fstat (fileno (file), &statbuf) || !(statbuf.st_mode & S_IFREG))
return 0;
return statbuf.st_size;
}
static int can_seek (void *id)
{
FILE *file = id;
struct stat statbuf;
return file && !fstat (fileno (file), &statbuf) && (statbuf.st_mode & S_IFREG);
}
static int32_t write_bytes (void *id, void *data, int32_t bcount)
{
return (int32_t) fwrite (data, 1, bcount, (FILE*) id);
}
static WavpackStreamReader freader = {
read_bytes, get_pos, set_pos_abs, set_pos_rel, push_back_byte, get_length, can_seek,
write_bytes
};
// This function attempts to open the specified WavPack file for reading. If
// this fails for any reason then an appropriate message is copied to "error"
// (which must accept 80 characters) and NULL is returned, otherwise a
// pointer to a WavpackContext structure is returned (which is used to call
// all other functions in this module). A filename beginning with "-" is
// assumed to be stdin. The "flags" argument has the following bit mask
// values to specify details of the open operation:
// OPEN_WVC: attempt to open/read "correction" file
// OPEN_TAGS: attempt to read ID3v1 / APEv2 tags (requires seekable file)
// OPEN_WRAPPER: make audio wrapper available (i.e. RIFF) to caller
// OPEN_2CH_MAX: open only first stream of multichannel file (usually L/R)
// OPEN_NORMALIZE: normalize floating point data to +/- 1.0 (w/ offset exp)
// OPEN_STREAMING: blindly unpacks blocks w/o regard to header file position
// OPEN_EDIT_TAGS: allow editing of tags (file must be writable)
// Version 4.2 of the WavPack library adds the OPEN_STREAMING flag. This is
// essentially a "raw" mode where the library will simply decode any blocks
// fed it through the reader callback, regardless of where those blocks came
// from in a stream. The only requirement is that complete WavPack blocks are
// fed to the decoder (and this may require multiple blocks in multichannel
// mode) and that complete blocks are decoded (even if all samples are not
// actually required). All the blocks must contain the same number of channels
// and bit resolution, and the correction data must be either present or not.
// All other parameters may change from block to block (like lossy/lossless).
// Obviously, in this mode any seeking must be performed by the application
// (and again, decoding must start at the beginning of the block containing
// the seek sample).
WavpackContext *WavpackOpenFileInput (const char *infilename, char *error, int flags, int norm_offset)
{
char *file_mode = (flags & OPEN_EDIT_TAGS) ? "r+b" : "rb";
FILE *wv_id, *wvc_id;
WavpackContext *wpc;
if (*infilename == '-') {
wv_id = stdin;
#if defined(WIN32)
_setmode (fileno (stdin), O_BINARY);
#endif
#if defined(__OS2__)
setmode (fileno (stdin), O_BINARY);
#endif
}
else if ((wv_id = fopen (infilename, file_mode)) == NULL) {
strcpy (error, (flags & OPEN_EDIT_TAGS) ? "can't open file for editing" : "can't open file");
return NULL;
}
if (wv_id != stdin && (flags & OPEN_WVC)) {
char *in2filename = malloc (strlen (infilename) + 10);
strcpy (in2filename, infilename);
strcat (in2filename, "c");
wvc_id = fopen (in2filename, "rb");
free (in2filename);
}
else
wvc_id = NULL;
wpc = WavpackOpenFileInputEx (&freader, wv_id, wvc_id, error, flags, norm_offset);
if (!wpc) {
if (wv_id)
fclose (wv_id);
if (wvc_id)
fclose (wvc_id);
}
else
wpc->close_files = TRUE;
return wpc;
}
#endif
// This function is identical to WavpackOpenFileInput() except that instead
// of providing a filename to open, the caller provides a pointer to a set of
// reader callbacks and instances of up to two streams. The first of these
// streams is required and contains the regular WavPack data stream; the second
// contains the "correction" file if desired. Unlike the standard open
// function which handles the correction file transparently, in this case it
// is the responsibility of the caller to be aware of correction files.
WavpackContext *WavpackOpenFileInputEx (WavpackStreamReader *reader, void *wv_id, void *wvc_id, char *error, int flags, int norm_offset)
{
WavpackContext *wpc = malloc (sizeof (WavpackContext));
WavpackStream *wps;
int num_blocks = 0;
unsigned char first_byte;
uint32_t bcount;
if (!wpc) {
strcpy (error, "can't allocate memory");
return NULL;
}
CLEAR (*wpc);
wpc->wv_in = wv_id;
wpc->wvc_in = wvc_id;
wpc->reader = reader;
wpc->total_samples = (uint32_t) -1;
wpc->norm_offset = norm_offset;
wpc->max_streams = OLD_MAX_STREAMS; // use this until overwritten with actual number
wpc->open_flags = flags;
wpc->filelen = wpc->reader->get_length (wpc->wv_in);
#ifndef NO_TAGS
if ((flags & (OPEN_TAGS | OPEN_EDIT_TAGS)) && wpc->reader->can_seek (wpc->wv_in)) {
load_tag (wpc);
wpc->reader->set_pos_abs (wpc->wv_in, 0);
}
#endif
#ifndef VER4_ONLY
if (wpc->reader->read_bytes (wpc->wv_in, &first_byte, 1) != 1) {
strcpy (error, "can't read all of WavPack file!");
return WavpackCloseFile (wpc);
}
wpc->reader->push_back_byte (wpc->wv_in, first_byte);
if (first_byte == 'R')
return open_file3 (wpc, error);
#endif
wpc->streams = malloc ((wpc->num_streams = 1) * sizeof (wpc->streams [0]));
wpc->streams [0] = wps = malloc (sizeof (WavpackStream));
CLEAR (*wps);
while (!wps->wphdr.block_samples) {
wpc->filepos = wpc->reader->get_pos (wpc->wv_in);
bcount = read_next_header (wpc->reader, wpc->wv_in, &wps->wphdr);
if (bcount == (uint32_t) -1 ||
(!wps->wphdr.block_samples && num_blocks++ > 16)) {
strcpy (error, "not compatible with this version of WavPack file!");
return WavpackCloseFile (wpc);
}
wpc->filepos += bcount;
wps->blockbuff = malloc (wps->wphdr.ckSize + 8);
memcpy (wps->blockbuff, &wps->wphdr, 32);
if (wpc->reader->read_bytes (wpc->wv_in, wps->blockbuff + 32, wps->wphdr.ckSize - 24) != wps->wphdr.ckSize - 24) {
strcpy (error, "can't read all of WavPack file!");
return WavpackCloseFile (wpc);
}
wps->init_done = FALSE;
if (wps->wphdr.block_samples && !(flags & OPEN_STREAMING)) {
if (wps->wphdr.block_index || wps->wphdr.total_samples == (uint32_t) -1) {
wpc->initial_index = wps->wphdr.block_index;
wps->wphdr.block_index = 0;
if (wpc->reader->can_seek (wpc->wv_in)) {
uint32_t pos_save = wpc->reader->get_pos (wpc->wv_in);
uint32_t final_index = seek_final_index (wpc->reader, wpc->wv_in);
if (final_index != (uint32_t) -1)
wpc->total_samples = final_index - wpc->initial_index;
wpc->reader->set_pos_abs (wpc->wv_in, pos_save);
}
}
else
wpc->total_samples = wps->wphdr.total_samples;
}
if (wpc->wvc_in && wps->wphdr.block_samples && (wps->wphdr.flags & HYBRID_FLAG)) {
wpc->file2len = wpc->reader->get_length (wpc->wvc_in);
wpc->wvc_flag = TRUE;
}
if (wpc->wvc_flag && !read_wvc_block (wpc)) {
strcpy (error, "not compatible with this version of correction file!");
return WavpackCloseFile (wpc);
}
if (!wps->init_done && !unpack_init (wpc)) {
strcpy (error, wpc->error_message [0] ? wpc->error_message :
"not compatible with this version of WavPack file!");
return WavpackCloseFile (wpc);
}
wps->init_done = TRUE;
}
wpc->config.flags &= ~0xff;
wpc->config.flags |= wps->wphdr.flags & 0xff;
wpc->config.bytes_per_sample = (wps->wphdr.flags & BYTES_STORED) + 1;
wpc->config.float_norm_exp = wps->float_norm_exp;
wpc->config.bits_per_sample = (wpc->config.bytes_per_sample * 8) -
((wps->wphdr.flags & SHIFT_MASK) >> SHIFT_LSB);
if (!wpc->config.sample_rate) {
if (!wps || !wps->wphdr.block_samples || (wps->wphdr.flags & SRATE_MASK) == SRATE_MASK)
wpc->config.sample_rate = 44100;
else
wpc->config.sample_rate = sample_rates [(wps->wphdr.flags & SRATE_MASK) >> SRATE_LSB];
}
if (!wpc->config.num_channels) {
wpc->config.num_channels = (wps->wphdr.flags & MONO_FLAG) ? 1 : 2;
wpc->config.channel_mask = 0x5 - wpc->config.num_channels;
}
if ((flags & OPEN_2CH_MAX) && !(wps->wphdr.flags & FINAL_BLOCK))
wpc->reduced_channels = (wps->wphdr.flags & MONO_FLAG) ? 1 : 2;
return wpc;
}
// This function obtains general information about an open input file and
// returns a mask with the following bit values:
// MODE_WVC: a .wvc file has been found and will be used for lossless
// MODE_LOSSLESS: file is lossless (either pure or hybrid)
// MODE_HYBRID: file is hybrid mode (either lossy or lossless)
// MODE_FLOAT: audio data is 32-bit ieee floating point
// MODE_VALID_TAG: file conatins a valid ID3v1 or APEv2 tag
// MODE_HIGH: file was created in "high" mode (information only)
// MODE_FAST: file was created in "fast" mode (information only)
// MODE_EXTRA: file was created using "extra" mode (information only)
// MODE_APETAG: file contains a valid APEv2 tag
// MODE_SFX: file was created as a "self-extracting" executable
// MODE_VERY_HIGH: file was created in the "very high" mode (or in
// the "high" mode prior to 4.4)
// MODE_MD5: file contains an MD5 checksum
// MODE_XMODE: level used for extra mode (1-6, 0=unknown)
// MODE_DNS: dynamic noise shaping
int WavpackGetMode (WavpackContext *wpc)
{
int mode = 0;
if (wpc) {
if (wpc->config.flags & CONFIG_HYBRID_FLAG)
mode |= MODE_HYBRID;
else if (!(wpc->config.flags & CONFIG_LOSSY_MODE))
mode |= MODE_LOSSLESS;
if (wpc->wvc_flag)
mode |= (MODE_LOSSLESS | MODE_WVC);
if (wpc->lossy_blocks)
mode &= ~MODE_LOSSLESS;
if (wpc->config.flags & CONFIG_FLOAT_DATA)
mode |= MODE_FLOAT;
if (wpc->config.flags & (CONFIG_HIGH_FLAG | CONFIG_VERY_HIGH_FLAG)) {
mode |= MODE_HIGH;
if ((wpc->config.flags & CONFIG_VERY_HIGH_FLAG) ||
(wpc->streams && wpc->streams [0] && wpc->streams [0]->wphdr.version < 0x405))
mode |= MODE_VERY_HIGH;
}
if (wpc->config.flags & CONFIG_FAST_FLAG)
mode |= MODE_FAST;
if (wpc->config.flags & CONFIG_EXTRA_MODE)
mode |= (MODE_EXTRA | (wpc->config.xmode << 12));
if (wpc->config.flags & CONFIG_CREATE_EXE)
mode |= MODE_SFX;
if (wpc->config.flags & CONFIG_MD5_CHECKSUM)
mode |= MODE_MD5;
if ((wpc->config.flags & CONFIG_HYBRID_FLAG) && (wpc->config.flags & CONFIG_DYNAMIC_SHAPING) &&
wpc->streams && wpc->streams [0] && wpc->streams [0]->wphdr.version >= 0x407)
mode |= MODE_DNS;
#ifndef NO_TAGS
if (valid_tag (&wpc->m_tag)) {
mode |= MODE_VALID_TAG;
if (valid_tag (&wpc->m_tag) == 'A')
mode |= MODE_APETAG;
}
#endif
}
return mode;
}
// This function returns the major version number of the WavPack program
// (or library) that created the open file. Currently, this can be 1 to 4.
// Minor versions are not recorded in WavPack files.
int WavpackGetVersion (WavpackContext *wpc)
{
if (wpc) {
#ifndef VER4_ONLY
if (wpc->stream3)
return get_version3 (wpc);
#endif
return 4;
}
return 0;
}
#endif
// This function returns a pointer to a string describing the last error
// generated by WavPack.
char *WavpackGetErrorMessage (WavpackContext *wpc)
{
return wpc->error_message;
}
#ifndef NO_UNPACK
// Unpack the specified number of samples from the current file position.
// Note that "samples" here refers to "complete" samples, which would be
// 2 longs for stereo files or even more for multichannel files, so the
// required memory at "buffer" is 4 * samples * num_channels bytes. The
// audio data is returned right-justified in 32-bit longs in the endian
// mode native to the executing processor. So, if the original data was
// 16-bit, then the values returned would be +/-32k. Floating point data
// can also be returned if the source was floating point data (and this
// can be optionally normalized to +/-1.0 by using the appropriate flag
// in the call to WavpackOpenFileInput ()). The actual number of samples
// unpacked is returned, which should be equal to the number requested unless
// the end of fle is encountered or an error occurs. After all samples have
// been unpacked then 0 will be returned.
uint32_t WavpackUnpackSamples (WavpackContext *wpc, int32_t *buffer, uint32_t samples)
{
WavpackStream *wps = wpc->streams ? wpc->streams [wpc->current_stream = 0] : NULL;
uint32_t bcount, samples_unpacked = 0, samples_to_unpack;
int num_channels = wpc->config.num_channels;
int file_done = FALSE;
#ifndef VER4_ONLY
if (wpc->stream3)
return unpack_samples3 (wpc, buffer, samples);
#endif
while (samples) {
if (!wps->wphdr.block_samples || !(wps->wphdr.flags & INITIAL_BLOCK) ||
wps->sample_index >= wps->wphdr.block_index + wps->wphdr.block_samples) {
if (wpc->wrapper_bytes >= MAX_WRAPPER_BYTES)
break;
free_streams (wpc);
wpc->filepos = wpc->reader->get_pos (wpc->wv_in);
bcount = read_next_header (wpc->reader, wpc->wv_in, &wps->wphdr);
if (bcount == (uint32_t) -1)
break;
if (wpc->open_flags & OPEN_STREAMING)
wps->wphdr.block_index = wps->sample_index = 0;
else
wps->wphdr.block_index -= wpc->initial_index;
wpc->filepos += bcount;
wps->blockbuff = malloc (wps->wphdr.ckSize + 8);
memcpy (wps->blockbuff, &wps->wphdr, 32);
if (wpc->reader->read_bytes (wpc->wv_in, wps->blockbuff + 32, wps->wphdr.ckSize - 24) !=
wps->wphdr.ckSize - 24) {
strcpy (wpc->error_message, "can't read all of last block!");
wps->wphdr.block_samples = 0;
wps->wphdr.ckSize = 24;
break;
}
wps->init_done = FALSE;
if (wps->wphdr.block_samples && wps->sample_index != wps->wphdr.block_index)
wpc->crc_errors++;
if (wps->wphdr.block_samples && wpc->wvc_flag)
read_wvc_block (wpc);
if (!wps->wphdr.block_samples) {
if (!wps->init_done && !unpack_init (wpc))
wpc->crc_errors++;
wps->init_done = TRUE;
}
}
if (!wps->wphdr.block_samples || !(wps->wphdr.flags & INITIAL_BLOCK) ||
wps->sample_index >= wps->wphdr.block_index + wps->wphdr.block_samples)
continue;
if (wps->sample_index < wps->wphdr.block_index) {
samples_to_unpack = wps->wphdr.block_index - wps->sample_index;
if (samples_to_unpack > 262144) {
strcpy (wpc->error_message, "discontinuity found, aborting file!");
wps->wphdr.block_samples = 0;
wps->wphdr.ckSize = 24;
break;
}
if (samples_to_unpack > samples)
samples_to_unpack = samples;
wps->sample_index += samples_to_unpack;
samples_unpacked += samples_to_unpack;
samples -= samples_to_unpack;
if (wpc->reduced_channels)
samples_to_unpack *= wpc->reduced_channels;
else
samples_to_unpack *= num_channels;
while (samples_to_unpack--)
*buffer++ = 0;
continue;
}
samples_to_unpack = wps->wphdr.block_index + wps->wphdr.block_samples - wps->sample_index;
if (samples_to_unpack > samples)
samples_to_unpack = samples;
if (!wps->init_done && !unpack_init (wpc))
wpc->crc_errors++;
wps->init_done = TRUE;
if (!wpc->reduced_channels && !(wps->wphdr.flags & FINAL_BLOCK)) {
int32_t *temp_buffer = malloc (samples_to_unpack * 8), *src, *dst;
int offset = 0;
uint32_t samcnt;
while (1) {
if (wpc->current_stream == wpc->num_streams) {
wpc->streams = realloc (wpc->streams, (wpc->num_streams + 1) * sizeof (wpc->streams [0]));
wps = wpc->streams [wpc->num_streams++] = malloc (sizeof (WavpackStream));
CLEAR (*wps);
bcount = read_next_header (wpc->reader, wpc->wv_in, &wps->wphdr);
if (bcount == (uint32_t) -1) {
wpc->streams [0]->wphdr.block_samples = 0;
wpc->streams [0]->wphdr.ckSize = 24;
file_done = TRUE;
break;
}
if (wpc->open_flags & OPEN_STREAMING)
wps->wphdr.block_index = wps->sample_index = 0;
else
wps->wphdr.block_index -= wpc->initial_index;
wps->blockbuff = malloc (wps->wphdr.ckSize + 8);
memcpy (wps->blockbuff, &wps->wphdr, 32);
if (wpc->reader->read_bytes (wpc->wv_in, wps->blockbuff + 32, wps->wphdr.ckSize - 24) !=
wps->wphdr.ckSize - 24) {
wpc->streams [0]->wphdr.block_samples = 0;
wpc->streams [0]->wphdr.ckSize = 24;
file_done = TRUE;
break;
}
wps->init_done = FALSE;
if (wpc->wvc_flag)
read_wvc_block (wpc);
if (!wps->init_done && !unpack_init (wpc))
wpc->crc_errors++;
wps->init_done = TRUE;
}
else
wps = wpc->streams [wpc->current_stream];
unpack_samples (wpc, src = temp_buffer, samples_to_unpack);
samcnt = samples_to_unpack;
dst = buffer + offset;
if (wps->wphdr.flags & MONO_FLAG) {
while (samcnt--) {
dst [0] = *src++;
dst += num_channels;
}
offset++;
}
else if (offset == num_channels - 1) {
while (samcnt--) {
dst [0] = src [0];
dst += num_channels;
src += 2;
}
wpc->crc_errors++;
offset++;
}
else {
while (samcnt--) {
dst [0] = *src++;
dst [1] = *src++;
dst += num_channels;
}
offset += 2;
}
if ((wps->wphdr.flags & FINAL_BLOCK) || wpc->current_stream == wpc->max_streams - 1 || offset == num_channels)
break;
else
wpc->current_stream++;
}
wps = wpc->streams [wpc->current_stream = 0];
free (temp_buffer);
}
else
unpack_samples (wpc, buffer, samples_to_unpack);
if (file_done) {
strcpy (wpc->error_message, "can't read all of last block!");
break;
}
if (wpc->reduced_channels)
buffer += samples_to_unpack * wpc->reduced_channels;
else
buffer += samples_to_unpack * num_channels;
samples_unpacked += samples_to_unpack;
samples -= samples_to_unpack;
if (wps->sample_index == wps->wphdr.block_index + wps->wphdr.block_samples) {
if (check_crc_error (wpc) && wps->blockbuff) {
if (wpc->reader->can_seek (wpc->wv_in)) {
int32_t rseek = ((WavpackHeader *) wps->blockbuff)->ckSize / 3;
wpc->reader->set_pos_rel (wpc->wv_in, (rseek > 16384) ? -16384 : -rseek, SEEK_CUR);
}
if (wpc->wvc_flag && wps->block2buff && wpc->reader->can_seek (wpc->wvc_in)) {
int32_t rseek = ((WavpackHeader *) wps->block2buff)->ckSize / 3;
wpc->reader->set_pos_rel (wpc->wvc_in, (rseek > 16384) ? -16384 : -rseek, SEEK_CUR);
}
wpc->crc_errors++;
}
}
if (wpc->total_samples != (uint32_t) -1 && wps->sample_index == wpc->total_samples)
break;
}
return samples_unpacked;
}
#ifndef NO_SEEKING
static uint32_t find_sample (WavpackContext *wpc, void *infile, uint32_t header_pos, uint32_t sample);
// Seek to the specifed sample index, returning TRUE on success. Note that
// files generated with version 4.0 or newer will seek almost immediately.
// Older files can take quite long if required to seek through unplayed
// portions of the file, but will create a seek map so that reverse seeks
// (or forward seeks to already scanned areas) will be very fast. After a
// FALSE return the file should not be accessed again (other than to close
// it); this is a fatal error.
int WavpackSeekSample (WavpackContext *wpc, uint32_t sample)
{
WavpackStream *wps = wpc->streams ? wpc->streams [wpc->current_stream = 0] : NULL;
uint32_t bcount, samples_to_skip;
int32_t *buffer;
if (wpc->total_samples == (uint32_t) -1 || sample >= wpc->total_samples ||
!wpc->reader->can_seek (wpc->wv_in) || (wpc->open_flags & OPEN_STREAMING) ||
(wpc->wvc_flag && !wpc->reader->can_seek (wpc->wvc_in)))
return FALSE;
#ifndef VER4_ONLY
if (wpc->stream3)
return seek_sample3 (wpc, sample);
#endif
if (!wps->wphdr.block_samples || !(wps->wphdr.flags & INITIAL_BLOCK) || sample < wps->wphdr.block_index ||
sample >= wps->wphdr.block_index + wps->wphdr.block_samples) {
free_streams (wpc);
wpc->filepos = find_sample (wpc, wpc->wv_in, wpc->filepos, sample);
if (wpc->filepos == (uint32_t) -1)
return FALSE;
if (wpc->wvc_flag) {
wpc->file2pos = find_sample (wpc, wpc->wvc_in, 0, sample);
if (wpc->file2pos == (uint32_t) -1)
return FALSE;
}
}
if (!wps->blockbuff) {
wpc->reader->set_pos_abs (wpc->wv_in, wpc->filepos);
wpc->reader->read_bytes (wpc->wv_in, &wps->wphdr, sizeof (WavpackHeader));
little_endian_to_native (&wps->wphdr, WavpackHeaderFormat);
wps->wphdr.block_index -= wpc->initial_index;
wps->blockbuff = malloc (wps->wphdr.ckSize + 8);
memcpy (wps->blockbuff, &wps->wphdr, sizeof (WavpackHeader));
if (wpc->reader->read_bytes (wpc->wv_in, wps->blockbuff + sizeof (WavpackHeader), wps->wphdr.ckSize - 24) !=
wps->wphdr.ckSize - 24) {
free_streams (wpc);
return FALSE;
}
wps->init_done = FALSE;
if (wpc->wvc_flag) {
wpc->reader->set_pos_abs (wpc->wvc_in, wpc->file2pos);
wpc->reader->read_bytes (wpc->wvc_in, &wps->wphdr, sizeof (WavpackHeader));
little_endian_to_native (&wps->wphdr, WavpackHeaderFormat);
wps->wphdr.block_index -= wpc->initial_index;
wps->block2buff = malloc (wps->wphdr.ckSize + 8);
memcpy (wps->block2buff, &wps->wphdr, sizeof (WavpackHeader));
if (wpc->reader->read_bytes (wpc->wvc_in, wps->block2buff + sizeof (WavpackHeader), wps->wphdr.ckSize - 24) !=
wps->wphdr.ckSize - 24) {
free_streams (wpc);
return FALSE;
}
}
if (!wps->init_done && !unpack_init (wpc)) {
free_streams (wpc);
return FALSE;
}
wps->init_done = TRUE;
}
while (!wpc->reduced_channels && !(wps->wphdr.flags & FINAL_BLOCK)) {
if (++wpc->current_stream == wpc->num_streams) {
if (wpc->num_streams == wpc->max_streams) {
free_streams (wpc);
return FALSE;
}
wpc->streams = realloc (wpc->streams, (wpc->num_streams + 1) * sizeof (wpc->streams [0]));
wps = wpc->streams [wpc->num_streams++] = malloc (sizeof (WavpackStream));
CLEAR (*wps);
bcount = read_next_header (wpc->reader, wpc->wv_in, &wps->wphdr);
if (bcount == (uint32_t) -1) {
free_streams (wpc);
return FALSE;
}
wps->blockbuff = malloc (wps->wphdr.ckSize + 8);
memcpy (wps->blockbuff, &wps->wphdr, 32);
if (wpc->reader->read_bytes (wpc->wv_in, wps->blockbuff + 32, wps->wphdr.ckSize - 24) !=
wps->wphdr.ckSize - 24) {
free_streams (wpc);
return FALSE;
}
wps->init_done = FALSE;
if (wpc->wvc_flag && !read_wvc_block (wpc)) {
free_streams (wpc);
return FALSE;
}
if (!wps->init_done && !unpack_init (wpc)) {
free_streams (wpc);
return FALSE;
}
wps->init_done = TRUE;
}
else
wps = wpc->streams [wpc->current_stream];
}
if (sample < wps->sample_index) {
for (wpc->current_stream = 0; wpc->current_stream < wpc->num_streams; wpc->current_stream++)
if (!unpack_init (wpc))
return FALSE;
else
wpc->streams [wpc->current_stream]->init_done = TRUE;
}
samples_to_skip = sample - wps->sample_index;
if (samples_to_skip > 131072) {
free_streams (wpc);
return FALSE;
}
if (samples_to_skip) {
buffer = malloc (samples_to_skip * 8);
for (wpc->current_stream = 0; wpc->current_stream < wpc->num_streams; wpc->current_stream++)
unpack_samples (wpc, buffer, samples_to_skip);
free (buffer);
}
wpc->current_stream = 0;
return TRUE;
}
#endif
#endif
#ifndef NO_PACK
// Open context for writing WavPack files. The returned context pointer is used
// in all following calls to the library. The "blockout" function will be used
// to store the actual completed WavPack blocks and will be called with the id
// pointers containing user defined data (one for the wv file and one for the
// wvc file). A return value of NULL indicates that memory could not be
// allocated for the context.
WavpackContext *WavpackOpenFileOutput (WavpackBlockOutput blockout, void *wv_id, void *wvc_id)
{
WavpackContext *wpc = malloc (sizeof (WavpackContext));
if (!wpc)
return NULL;
CLEAR (*wpc);
wpc->blockout = blockout;
wpc->wv_out = wv_id;
wpc->wvc_out = wvc_id;
return wpc;
}
// Set configuration for writing WavPack files. This must be done before
// sending any actual samples, however it is okay to send wrapper or other
// metadata before calling this. The "config" structure contains the following
// required information:
// config->bytes_per_sample see WavpackGetBytesPerSample() for info
// config->bits_per_sample see WavpackGetBitsPerSample() for info
// config->channel_mask Microsoft standard (mono = 4, stereo = 3)
// config->num_channels self evident
// config->sample_rate self evident
// In addition, the following fields and flags may be set:
// config->flags:
// --------------
// o CONFIG_HYBRID_FLAG select hybrid mode (must set bitrate)
// o CONFIG_JOINT_STEREO select joint stereo (must set override also)
// o CONFIG_JOINT_OVERRIDE override default joint stereo selection
// o CONFIG_HYBRID_SHAPE select hybrid noise shaping (set override &
// shaping_weight != 0.0)
// o CONFIG_SHAPE_OVERRIDE override default hybrid noise shaping
// (set CONFIG_HYBRID_SHAPE and shaping_weight)
// o CONFIG_FAST_FLAG "fast" compression mode
// o CONFIG_HIGH_FLAG "high" compression mode
// o CONFIG_BITRATE_KBPS hybrid bitrate is kbps, not bits / sample
// o CONFIG_CREATE_WVC create correction file
// o CONFIG_OPTIMIZE_WVC maximize bybrid compression (-cc option)
// o CONFIG_CALC_NOISE calc noise in hybrid mode
// o CONFIG_EXTRA_MODE extra processing mode (slow!)
// o CONFIG_SKIP_WVX no wvx stream for floats & large ints
// o CONFIG_MD5_CHECKSUM specify if you plan to store MD5 signature
// o CONFIG_CREATE_EXE specify if you plan to prepend sfx module
// o CONFIG_OPTIMIZE_MONO detect and optimize for mono files posing as
// stereo (uses a more recent stream format that
// is not compatible with decoders < 4.3)
// config->bitrate hybrid bitrate in either bits/sample or kbps
// config->shaping_weight hybrid noise shaping coefficient override
// config->block_samples force samples per WavPack block (0 = use deflt)
// config->float_norm_exp select floating-point data (127 for +/-1.0)
// config->xmode extra mode processing value override
// If the number of samples to be written is known then it should be passed
// here. If the duration is not known then pass -1. In the case that the size
// is not known (or the writing is terminated early) then it is suggested that
// the application retrieve the first block written and let the library update
// the total samples indication. A function is provided to do this update and
// it should be done to the "correction" file also. If this cannot be done
// (because a pipe is being used, for instance) then a valid WavPack will still
// be created, but when applications want to access that file they will have
// to seek all the way to the end to determine the actual duration. Also, if
// a RIFF header has been included then it should be updated as well or the
// WavPack file will not be directly unpackable to a valid wav file (although
// it will still be usable by itself). A return of FALSE indicates an error.
int WavpackSetConfiguration (WavpackContext *wpc, WavpackConfig *config, uint32_t total_samples)
{
uint32_t flags = (config->bytes_per_sample - 1), bps = 0, shift = 0;
uint32_t chan_mask = config->channel_mask;
int num_chans = config->num_channels;
int i;
wpc->total_samples = total_samples;
wpc->config.sample_rate = config->sample_rate;
wpc->config.num_channels = config->num_channels;
wpc->config.channel_mask = config->channel_mask;
wpc->config.bits_per_sample = config->bits_per_sample;
wpc->config.bytes_per_sample = config->bytes_per_sample;
wpc->config.block_samples = config->block_samples;
wpc->config.flags = config->flags;
if (config->flags & CONFIG_VERY_HIGH_FLAG)
wpc->config.flags |= CONFIG_HIGH_FLAG;
if (config->float_norm_exp) {
wpc->config.float_norm_exp = config->float_norm_exp;
wpc->config.flags |= CONFIG_FLOAT_DATA;
flags |= FLOAT_DATA;
}
else
shift = (config->bytes_per_sample * 8) - config->bits_per_sample;
for (i = 0; i < 15; ++i)
if (wpc->config.sample_rate == sample_rates [i])
break;
flags |= i << SRATE_LSB;
flags |= shift << SHIFT_LSB;
if (config->flags & CONFIG_HYBRID_FLAG) {
flags |= HYBRID_FLAG | HYBRID_BITRATE | HYBRID_BALANCE;
if (!(wpc->config.flags & CONFIG_SHAPE_OVERRIDE)) {
wpc->config.flags |= CONFIG_HYBRID_SHAPE | CONFIG_AUTO_SHAPING;
flags |= HYBRID_SHAPE | NEW_SHAPING;
}
else if (wpc->config.flags & CONFIG_HYBRID_SHAPE) {
wpc->config.shaping_weight = config->shaping_weight;
flags |= HYBRID_SHAPE | NEW_SHAPING;
}
if (wpc->config.flags & CONFIG_OPTIMIZE_WVC)
flags |= CROSS_DECORR;
if (config->flags & CONFIG_BITRATE_KBPS) {
bps = (uint32_t) floor (config->bitrate * 256000.0 / config->sample_rate / config->num_channels + 0.5);
if (bps > (64 << 8))
bps = 64 << 8;
}
else
bps = (uint32_t) floor (config->bitrate * 256.0 + 0.5);
}
else
flags |= CROSS_DECORR;
if (!(config->flags & CONFIG_JOINT_OVERRIDE) || (config->flags & CONFIG_JOINT_STEREO))
flags |= JOINT_STEREO;
if (config->flags & CONFIG_CREATE_WVC)
wpc->wvc_flag = TRUE;
wpc->stream_version = (config->flags & CONFIG_OPTIMIZE_MONO) ? MAX_STREAM_VERS : CUR_STREAM_VERS;
for (wpc->current_stream = 0; num_chans; wpc->current_stream++) {
WavpackStream *wps = malloc (sizeof (WavpackStream));
uint32_t stereo_mask, mono_mask;
int pos, chans = 0;
wpc->streams = realloc (wpc->streams, (wpc->current_stream + 1) * sizeof (wpc->streams [0]));
wpc->streams [wpc->current_stream] = wps;
CLEAR (*wps);
for (pos = 1; pos <= 18; ++pos) {
stereo_mask = 3 << (pos - 1);
mono_mask = 1 << (pos - 1);
if ((chan_mask & stereo_mask) == stereo_mask && (mono_mask & 0x251)) {
chan_mask &= ~stereo_mask;
chans = 2;
break;
}
else if (chan_mask & mono_mask) {
chan_mask &= ~mono_mask;
chans = 1;
break;
}
}
if (!chans) {
if (config->flags & CONFIG_PAIR_UNDEF_CHANS)
chans = num_chans > 1 ? 2 : 1;
else
chans = 1;
}
num_chans -= chans;
if (num_chans && wpc->current_stream == NEW_MAX_STREAMS - 1)
break;
memcpy (wps->wphdr.ckID, "wvpk", 4);
wps->wphdr.ckSize = sizeof (WavpackHeader) - 8;
wps->wphdr.total_samples = wpc->total_samples;
wps->wphdr.version = wpc->stream_version;
wps->wphdr.flags = flags;
wps->bits = bps;
if (!wpc->current_stream)
wps->wphdr.flags |= INITIAL_BLOCK;
if (!num_chans)
wps->wphdr.flags |= FINAL_BLOCK;
if (chans == 1) {
wps->wphdr.flags &= ~(JOINT_STEREO | CROSS_DECORR | HYBRID_BALANCE);
wps->wphdr.flags |= MONO_FLAG;
}
}
wpc->num_streams = wpc->current_stream;
wpc->current_stream = 0;
if (num_chans) {
strcpy (wpc->error_message, "too many channels!");
return FALSE;
}
if (config->flags & CONFIG_EXTRA_MODE)
wpc->config.xmode = config->xmode ? config->xmode : 1;
return TRUE;
}
// Prepare to actually pack samples by determining the size of the WavPack
// blocks and allocating sample buffers and initializing each stream. Call
// after WavpackSetConfiguration() and before WavpackPackSamples(). A return
// of FALSE indicates an error.
int WavpackPackInit (WavpackContext *wpc)
{
if (wpc->metabytes > 16384) // 16384 bytes still leaves plenty of room for audio
write_metadata_block (wpc); // in this block (otherwise write a special one)
if (wpc->config.flags & CONFIG_HIGH_FLAG)
wpc->block_samples = wpc->config.sample_rate;
else if (!(wpc->config.sample_rate % 2))
wpc->block_samples = wpc->config.sample_rate / 2;
else
wpc->block_samples = wpc->config.sample_rate;
while (wpc->block_samples * wpc->config.num_channels > 150000)
wpc->block_samples /= 2;
while (wpc->block_samples * wpc->config.num_channels < 40000)
wpc->block_samples *= 2;
if (wpc->config.block_samples) {
if ((wpc->config.flags & CONFIG_MERGE_BLOCKS) &&
wpc->block_samples > (uint32_t) wpc->config.block_samples) {
wpc->block_boundary = wpc->config.block_samples;
wpc->block_samples /= wpc->config.block_samples;
wpc->block_samples *= wpc->config.block_samples;
}
else
wpc->block_samples = wpc->config.block_samples;
}
wpc->ave_block_samples = wpc->block_samples;
wpc->max_samples = wpc->block_samples + (wpc->block_samples >> 1);
for (wpc->current_stream = 0; wpc->current_stream < wpc->num_streams; wpc->current_stream++) {
WavpackStream *wps = wpc->streams [wpc->current_stream];
wps->sample_buffer = malloc (wpc->max_samples * (wps->wphdr.flags & MONO_FLAG ? 4 : 8));
pack_init (wpc);
}
return TRUE;
}
// Pack the specified samples. Samples must be stored in longs in the native
// endian format of the executing processor. The number of samples specified
// indicates composite samples (sometimes called "frames"). So, the actual
// number of data points would be this "sample_count" times the number of
// channels. Note that samples are accumulated here until enough exist to
// create a complete WavPack block (or several blocks for multichannel audio).
// If an application wants to break a block at a specific sample, then it must
// simply call WavpackFlushSamples() to force an early termination. Completed
// WavPack blocks are send to the function provided in the initial call to
// WavpackOpenFileOutput(). A return of FALSE indicates an error.
static int pack_streams (WavpackContext *wpc, uint32_t block_samples);
static int create_riff_header (WavpackContext *wpc);
int WavpackPackSamples (WavpackContext *wpc, int32_t *sample_buffer, uint32_t sample_count)
{
int nch = wpc->config.num_channels;
while (sample_count) {
int32_t *source_pointer = sample_buffer;
unsigned int samples_to_copy;
if (!wpc->riff_header_added && !wpc->riff_header_created && !create_riff_header (wpc))
return FALSE;
if (wpc->acc_samples + sample_count > wpc->max_samples)
samples_to_copy = wpc->max_samples - wpc->acc_samples;
else
samples_to_copy = sample_count;
for (wpc->current_stream = 0; wpc->current_stream < wpc->num_streams; wpc->current_stream++) {
WavpackStream *wps = wpc->streams [wpc->current_stream];
int32_t *dptr, *sptr, cnt;
dptr = wps->sample_buffer + wpc->acc_samples * (wps->wphdr.flags & MONO_FLAG ? 1 : 2);
sptr = source_pointer;
cnt = samples_to_copy;
if (wps->wphdr.flags & MONO_FLAG) {
while (cnt--) {
*dptr++ = *sptr;
sptr += nch;
}
source_pointer++;
}
else {
while (cnt--) {
*dptr++ = sptr [0];
*dptr++ = sptr [1];
sptr += nch;
}
source_pointer += 2;
}
}
sample_buffer += samples_to_copy * nch;
sample_count -= samples_to_copy;
if ((wpc->acc_samples += samples_to_copy) == wpc->max_samples &&
!pack_streams (wpc, wpc->block_samples))
return FALSE;
}
return TRUE;
}
// Flush all accumulated samples into WavPack blocks. This is normally called
// after all samples have been sent to WavpackPackSamples(), but can also be
// called to terminate a WavPack block at a specific sample (in other words it
// is possible to continue after this operation). This is also called to
// dump non-audio blocks like those holding metadata for various purposes.
// A return of FALSE indicates an error.
int WavpackFlushSamples (WavpackContext *wpc)
{
while (wpc->acc_samples) {
uint32_t block_samples;
if (wpc->acc_samples > wpc->block_samples)
block_samples = wpc->acc_samples / 2;
else
block_samples = wpc->acc_samples;
if (!pack_streams (wpc, block_samples))
return FALSE;
}
if (wpc->metacount)
write_metadata_block (wpc);
return TRUE;
}
// Note: The following function is no longer required because a proper wav
// header is now automatically generated for the application. However, if the
// application wants to generate its own header or wants to include additional
// chunks, then this function can still be used in which case the automatic
// wav header generation is suppressed.
// Add wrapper (currently RIFF only) to WavPack blocks. This should be called
// before sending any audio samples for the RIFF header or after all samples
// have been sent for any RIFF trailer. WavpackFlushSamples() should be called
// between sending the last samples and calling this for trailer data to make
// sure that headers and trailers don't get mixed up in very short files. If
// the exact contents of the RIFF header are not known because, for example,
// the file duration is uncertain or trailing chunks are possible, simply write
// a "dummy" header of the correct length. When all data has been written it
// will be possible to read the first block written and update the header
// directly. An example of this can be found in the Audition filter. A
// return of FALSE indicates an error.
int WavpackAddWrapper (WavpackContext *wpc, void *data, uint32_t bcount)
{
uint32_t index = WavpackGetSampleIndex (wpc);
unsigned char meta_id;
if (!index || index == (uint32_t) -1) {
wpc->riff_header_added = TRUE;
meta_id = ID_RIFF_HEADER;
}
else {
wpc->riff_trailer_bytes += bcount;
meta_id = ID_RIFF_TRAILER;
}
return add_to_metadata (wpc, data, bcount, meta_id);
}
// Store computed MD5 sum in WavPack metadata. Note that the user must compute
// the 16 byte sum; it is not done here. A return of FALSE indicates an error.
int WavpackStoreMD5Sum (WavpackContext *wpc, unsigned char data [16])
{
return add_to_metadata (wpc, data, 16, ID_MD5_CHECKSUM);
}
static int create_riff_header (WavpackContext *wpc)
{
RiffChunkHeader riffhdr;
ChunkHeader datahdr, fmthdr;
WaveHeader wavhdr;
uint32_t total_samples = wpc->total_samples, total_data_bytes;
int32_t channel_mask = wpc->config.channel_mask;
int32_t sample_rate = wpc->config.sample_rate;
int bytes_per_sample = wpc->config.bytes_per_sample;
int bits_per_sample = wpc->config.bits_per_sample;
int format = (wpc->config.float_norm_exp) ? 3 : 1;
int num_channels = wpc->config.num_channels;
int wavhdrsize = 16;
wpc->riff_header_created = TRUE;
if (format == 3 && wpc->config.float_norm_exp != 127) {
strcpy (wpc->error_message, "can't create valid RIFF wav header for non-normalized floating data!");
return FALSE;
}
if (total_samples == (uint32_t) -1)
total_samples = 0x7ffff000 / (bytes_per_sample * num_channels);
total_data_bytes = total_samples * bytes_per_sample * num_channels;
CLEAR (wavhdr);
wavhdr.FormatTag = format;
wavhdr.NumChannels = num_channels;
wavhdr.SampleRate = sample_rate;
wavhdr.BytesPerSecond = sample_rate * num_channels * bytes_per_sample;
wavhdr.BlockAlign = bytes_per_sample * num_channels;
wavhdr.BitsPerSample = bits_per_sample;
if (num_channels > 2 || channel_mask != 0x5 - num_channels) {
wavhdrsize = sizeof (wavhdr);
wavhdr.cbSize = 22;
wavhdr.ValidBitsPerSample = bits_per_sample;
wavhdr.SubFormat = format;
wavhdr.ChannelMask = channel_mask;
wavhdr.FormatTag = 0xfffe;
wavhdr.BitsPerSample = bytes_per_sample * 8;
wavhdr.GUID [4] = 0x10;
wavhdr.GUID [6] = 0x80;
wavhdr.GUID [9] = 0xaa;
wavhdr.GUID [11] = 0x38;
wavhdr.GUID [12] = 0x9b;
wavhdr.GUID [13] = 0x71;
}
strncpy (riffhdr.ckID, "RIFF", sizeof (riffhdr.ckID));
strncpy (riffhdr.formType, "WAVE", sizeof (riffhdr.formType));
riffhdr.ckSize = sizeof (riffhdr) + wavhdrsize + sizeof (datahdr) + total_data_bytes;
strncpy (fmthdr.ckID, "fmt ", sizeof (fmthdr.ckID));
fmthdr.ckSize = wavhdrsize;
strncpy (datahdr.ckID, "data", sizeof (datahdr.ckID));
datahdr.ckSize = total_data_bytes;
// write the RIFF chunks up to just before the data starts
native_to_little_endian (&riffhdr, ChunkHeaderFormat);
native_to_little_endian (&fmthdr, ChunkHeaderFormat);
native_to_little_endian (&wavhdr, WaveHeaderFormat);
native_to_little_endian (&datahdr, ChunkHeaderFormat);
return add_to_metadata (wpc, &riffhdr, sizeof (riffhdr), ID_RIFF_HEADER) &&
add_to_metadata (wpc, &fmthdr, sizeof (fmthdr), ID_RIFF_HEADER) &&
add_to_metadata (wpc, &wavhdr, wavhdrsize, ID_RIFF_HEADER) &&
add_to_metadata (wpc, &datahdr, sizeof (datahdr), ID_RIFF_HEADER);
}
static int pack_streams (WavpackContext *wpc, uint32_t block_samples)
{
uint32_t max_blocksize, bcount;
unsigned char *outbuff, *outend, *out2buff, *out2end;
int result = TRUE;
if ((wpc->config.flags & CONFIG_FLOAT_DATA) && !(wpc->config.flags & CONFIG_SKIP_WVX))
max_blocksize = block_samples * 16 + 4096;
else
max_blocksize = block_samples * 10 + 4096;
out2buff = (wpc->wvc_flag) ? malloc (max_blocksize) : NULL;
out2end = out2buff + max_blocksize;
outbuff = malloc (max_blocksize);
outend = outbuff + max_blocksize;
for (wpc->current_stream = 0; wpc->current_stream < wpc->num_streams; wpc->current_stream++) {
WavpackStream *wps = wpc->streams [wpc->current_stream];
uint32_t flags = wps->wphdr.flags;
flags &= ~MAG_MASK;
flags += (1 << MAG_LSB) * ((flags & BYTES_STORED) * 8 + 7);
wps->wphdr.block_index = wps->sample_index;
wps->wphdr.block_samples = block_samples;
wps->wphdr.flags = flags;
wps->block2buff = out2buff;
wps->block2end = out2end;
wps->blockbuff = outbuff;
wps->blockend = outend;
result = pack_block (wpc, wps->sample_buffer);
wps->blockbuff = wps->block2buff = NULL;
if (wps->wphdr.block_samples != block_samples)
block_samples = wps->wphdr.block_samples;
if (!result) {
strcpy (wpc->error_message, "output buffer overflowed!");
break;
}
bcount = ((WavpackHeader *) outbuff)->ckSize + 8;
native_to_little_endian ((WavpackHeader *) outbuff, WavpackHeaderFormat);
result = wpc->blockout (wpc->wv_out, outbuff, bcount);
if (!result) {
strcpy (wpc->error_message, "can't write WavPack data, disk probably full!");
break;
}
wpc->filelen += bcount;
if (out2buff) {
bcount = ((WavpackHeader *) out2buff)->ckSize + 8;
native_to_little_endian ((WavpackHeader *) out2buff, WavpackHeaderFormat);
result = wpc->blockout (wpc->wvc_out, out2buff, bcount);
if (!result) {
strcpy (wpc->error_message, "can't write WavPack data, disk probably full!");
break;
}
wpc->file2len += bcount;
}
if (wpc->acc_samples != block_samples)
memcpy (wps->sample_buffer, wps->sample_buffer + block_samples * (flags & MONO_FLAG ? 1 : 2),
(wpc->acc_samples - block_samples) * sizeof (int32_t) * (flags & MONO_FLAG ? 1 : 2));
}
wpc->current_stream = 0;
wpc->ave_block_samples = (wpc->ave_block_samples * 0x7 + block_samples + 0x4) >> 3;
wpc->acc_samples -= block_samples;
free (outbuff);
if (out2buff)
free (out2buff);
return result;
}
// Given the pointer to the first block written (to either a .wv or .wvc file),
// update the block with the actual number of samples written. If the wav
// header was generated by the library, then it is updated also. This should
// be done if WavpackSetConfiguration() was called with an incorrect number
// of samples (or -1). It is the responsibility of the application to read and
// rewrite the block. An example of this can be found in the Audition filter.
void WavpackUpdateNumSamples (WavpackContext *wpc, void *first_block)
{
uint32_t wrapper_size;
little_endian_to_native (first_block, WavpackHeaderFormat);
((WavpackHeader *) first_block)->total_samples = WavpackGetSampleIndex (wpc);
/* note that since the RIFF wrapper will not necessarily be properly aligned,
we copy it into a newly allocated buffer before modifying it */
if (wpc->riff_header_created) {
if (WavpackGetWrapperLocation (first_block, &wrapper_size)) {
uint32_t data_size = WavpackGetSampleIndex (wpc) * WavpackGetNumChannels (wpc) * WavpackGetBytesPerSample (wpc);
RiffChunkHeader *riffhdr;
ChunkHeader *datahdr;
void *wrapper_buff;
riffhdr = wrapper_buff = malloc (wrapper_size);
memcpy (wrapper_buff, WavpackGetWrapperLocation (first_block, NULL), wrapper_size);
datahdr = (ChunkHeader *)((char *) riffhdr + wrapper_size - sizeof (ChunkHeader));
if (!strncmp (riffhdr->ckID, "RIFF", 4)) {
little_endian_to_native (riffhdr, ChunkHeaderFormat);
riffhdr->ckSize = wrapper_size + data_size - 8 + wpc->riff_trailer_bytes;
native_to_little_endian (riffhdr, ChunkHeaderFormat);
}
if (!strncmp (datahdr->ckID, "data", 4)) {
little_endian_to_native (datahdr, ChunkHeaderFormat);
datahdr->ckSize = data_size;
native_to_little_endian (datahdr, ChunkHeaderFormat);
}
memcpy (WavpackGetWrapperLocation (first_block, NULL), wrapper_buff, wrapper_size);
free (wrapper_buff);
}
}
native_to_little_endian (first_block, WavpackHeaderFormat);
}
// Note: The following function is no longer required because the wav header
// automatically generated for the application will also be updated by
// WavpackUpdateNumSamples (). However, if the application wants to generate
// its own header or wants to include additional chunks, then this function
// still must be used to update the application generated header.
// Given the pointer to the first block written to a WavPack file, this
// function returns the location of the stored RIFF header that was originally
// written with WavpackAddWrapper(). This would normally be used to update
// the wav header to indicate that a different number of samples was actually
// written or if additional RIFF chunks are written at the end of the file.
// The "size" parameter can be set to non-NULL to obtain the exact size of the
// RIFF header, and the function will return FALSE if the header is not found
// in the block's metadata (or it is not a valid WavPack block). It is the
// responsibility of the application to read and rewrite the block. An example
// of this can be found in the Audition filter.
static void *find_metadata (void *wavpack_block, int desired_id, uint32_t *size);
void *WavpackGetWrapperLocation (void *first_block, uint32_t *size)
{
void *loc;
little_endian_to_native (first_block, WavpackHeaderFormat);
loc = find_metadata (first_block, ID_RIFF_HEADER, size);
native_to_little_endian (first_block, WavpackHeaderFormat);
return loc;
}
static void *find_metadata (void *wavpack_block, int desired_id, uint32_t *size)
{
WavpackHeader *wphdr = wavpack_block;
unsigned char *dp, meta_id, c1, c2;
int32_t bcount, meta_bc;
if (strncmp (wphdr->ckID, "wvpk", 4))
return NULL;
bcount = wphdr->ckSize - sizeof (WavpackHeader) + 8;
dp = (unsigned char *)(wphdr + 1);
while (bcount >= 2) {
meta_id = *dp++;
c1 = *dp++;
meta_bc = c1 << 1;
bcount -= 2;
if (meta_id & ID_LARGE) {
if (bcount < 2)
break;
c1 = *dp++;
c2 = *dp++;
meta_bc += ((uint32_t) c1 << 9) + ((uint32_t) c2 << 17);
bcount -= 2;
}
if ((meta_id & ID_UNIQUE) == desired_id) {
if ((bcount - meta_bc) >= 0) {
if (size)
*size = meta_bc - ((meta_id & ID_ODD_SIZE) ? 1 : 0);
return dp;
}
else
return NULL;
}
bcount -= meta_bc;
dp += meta_bc;
}
return NULL;
}
#endif
// Get total number of samples contained in the WavPack file, or -1 if unknown
uint32_t WavpackGetNumSamples (WavpackContext *wpc)
{
return wpc ? wpc->total_samples : (uint32_t) -1;
}
// Get the current sample index position, or -1 if unknown
uint32_t WavpackGetSampleIndex (WavpackContext *wpc)
{
if (wpc) {
#if !defined(VER4_ONLY) && !defined(NO_UNPACK)
if (wpc->stream3)
return get_sample_index3 (wpc);
else if (wpc->streams && wpc->streams [0])
return wpc->streams [0]->sample_index;
#else
if (wpc->streams && wpc->streams [0])
return wpc->streams [0]->sample_index;
#endif
}
return (uint32_t) -1;
}
// Get the number of errors encountered so far
int WavpackGetNumErrors (WavpackContext *wpc)
{
return wpc ? wpc->crc_errors : 0;
}
// return TRUE if any uncorrected lossy blocks were actually written or read
int WavpackLossyBlocks (WavpackContext *wpc)
{
return wpc ? wpc->lossy_blocks : 0;
}
// Calculate the progress through the file as a double from 0.0 (for begin)
// to 1.0 (for done). A return value of -1.0 indicates that the progress is
// unknown.
double WavpackGetProgress (WavpackContext *wpc)
{
if (wpc && wpc->total_samples != (uint32_t) -1 && wpc->total_samples != 0)
return (double) WavpackGetSampleIndex (wpc) / wpc->total_samples;
else
return -1.0;
}
// Return the total size of the WavPack file(s) in bytes.
uint32_t WavpackGetFileSize (WavpackContext *wpc)
{
return wpc ? wpc->filelen + wpc->file2len : 0;
}
// Calculate the ratio of the specified WavPack file size to the size of the
// original audio data as a double greater than 0.0 and (usually) smaller than
// 1.0. A value greater than 1.0 represents "negative" compression and a
// return value of 0.0 indicates that the ratio cannot be determined.
double WavpackGetRatio (WavpackContext *wpc)
{
if (wpc && wpc->total_samples != (uint32_t) -1 && wpc->filelen) {
double output_size = (double) wpc->total_samples * wpc->config.num_channels *
wpc->config.bytes_per_sample;
double input_size = (double) wpc->filelen + wpc->file2len;
if (output_size >= 1.0 && input_size >= 1.0)
return input_size / output_size;
}
return 0.0;
}
// Calculate the average bitrate of the WavPack file in bits per second. A
// return of 0.0 indicates that the bitrate cannot be determined. An option is
// provided to use (or not use) any attendant .wvc file.
double WavpackGetAverageBitrate (WavpackContext *wpc, int count_wvc)
{
if (wpc && wpc->total_samples != (uint32_t) -1 && wpc->filelen) {
double output_time = (double) wpc->total_samples / wpc->config.sample_rate;
double input_size = (double) wpc->filelen + (count_wvc ? wpc->file2len : 0);
if (output_time >= 0.1 && input_size >= 1.0)
return input_size * 8.0 / output_time;
}
return 0.0;
}
#ifndef NO_UNPACK
// Calculate the bitrate of the current WavPack file block in bits per second.
// This can be used for an "instant" bit display and gets updated from about
// 1 to 4 times per second. A return of 0.0 indicates that the bitrate cannot
// be determined.
double WavpackGetInstantBitrate (WavpackContext *wpc)
{
if (wpc && wpc->stream3)
return WavpackGetAverageBitrate (wpc, TRUE);
if (wpc && wpc->streams && wpc->streams [0] && wpc->streams [0]->wphdr.block_samples) {
double output_time = (double) wpc->streams [0]->wphdr.block_samples / wpc->config.sample_rate;
double input_size = 0;
int si;
for (si = 0; si < wpc->num_streams; ++si) {
if (wpc->streams [si]->blockbuff)
input_size += ((WavpackHeader *) wpc->streams [si]->blockbuff)->ckSize;
if (wpc->streams [si]->block2buff)
input_size += ((WavpackHeader *) wpc->streams [si]->block2buff)->ckSize;
}
if (output_time > 0.0 && input_size >= 1.0)
return input_size * 8.0 / output_time;
}
return 0.0;
}
#endif
// Close the specified WavPack file and release all resources used by it.
// Returns NULL.
WavpackContext *WavpackCloseFile (WavpackContext *wpc)
{
if (wpc->streams) {
free_streams (wpc);
if (wpc->streams [0])
free (wpc->streams [0]);
free (wpc->streams);
}
#if !defined(VER4_ONLY) && !defined(NO_UNPACK)
if (wpc->stream3)
free_stream3 (wpc);
#endif
#if !defined(NO_UNPACK) || defined(INFO_ONLY)
if (wpc->close_files) {
#ifndef NO_USE_FSTREAMS
if (wpc->wv_in != NULL)
fclose (wpc->wv_in);
if (wpc->wvc_in != NULL)
fclose (wpc->wvc_in);
#endif
}
WavpackFreeWrapper (wpc);
#endif
#ifndef NO_TAGS
free_tag (&wpc->m_tag);
#endif
free (wpc);
return NULL;
}
// Returns the sample rate of the specified WavPack file
uint32_t WavpackGetSampleRate (WavpackContext *wpc)
{
return wpc ? wpc->config.sample_rate : 44100;
}
// Returns the number of channels of the specified WavPack file. Note that
// this is the actual number of channels contained in the file even if the
// OPEN_2CH_MAX flag was specified when the file was opened.
int WavpackGetNumChannels (WavpackContext *wpc)
{
return wpc ? wpc->config.num_channels : 2;
}
// Returns the standard Microsoft channel mask for the specified WavPack
// file. A value of zero indicates that there is no speaker assignment
// information.
int WavpackGetChannelMask (WavpackContext *wpc)
{
return wpc ? wpc->config.channel_mask : 0;
}
// Return the normalization value for floating point data (valid only
// if floating point data is present). A value of 127 indicates that
// the floating point range is +/- 1.0. Higher values indicate a
// larger floating point range.
int WavpackGetFloatNormExp (WavpackContext *wpc)
{
return wpc->config.float_norm_exp;
}
// Returns the actual number of valid bits per sample contained in the
// original file, which may or may not be a multiple of 8. Floating data
// always has 32 bits, integers may be from 1 to 32 bits each. When this
// value is not a multiple of 8, then the "extra" bits are located in the
// LSBs of the results. That is, values are right justified when unpacked
// into ints, but are left justified in the number of bytes used by the
// original data.
int WavpackGetBitsPerSample (WavpackContext *wpc)
{
return wpc ? wpc->config.bits_per_sample : 16;
}
// Returns the number of bytes used for each sample (1 to 4) in the original
// file. This is required information for the user of this module because the
// audio data is returned in the LOWER bytes of the long buffer and must be
// left-shifted 8, 16, or 24 bits if normalized longs are required.
int WavpackGetBytesPerSample (WavpackContext *wpc)
{
return wpc ? wpc->config.bytes_per_sample : 2;
}
#if !defined(NO_UNPACK) || defined(INFO_ONLY)
// If the OPEN_2CH_MAX flag is specified when opening the file, this function
// will return the actual number of channels decoded from the file (which may
// or may not be less than the actual number of channels, but will always be
// 1 or 2). Normally, this will be the front left and right channels of a
// multichannel file.
int WavpackGetReducedChannels (WavpackContext *wpc)
{
if (wpc)
return wpc->reduced_channels ? wpc->reduced_channels : wpc->config.num_channels;
else
return 2;
}
// These routines are used to access (and free) header and trailer data that
// was retrieved from the Wavpack file. The header will be available before
// the samples are decoded and the trailer will be available after all samples
// have been read.
uint32_t WavpackGetWrapperBytes (WavpackContext *wpc)
{
return wpc ? wpc->wrapper_bytes : 0;
}
unsigned char *WavpackGetWrapperData (WavpackContext *wpc)
{
return wpc ? wpc->wrapper_data : NULL;
}
void WavpackFreeWrapper (WavpackContext *wpc)
{
if (wpc && wpc->wrapper_data) {
free (wpc->wrapper_data);
wpc->wrapper_data = NULL;
wpc->wrapper_bytes = 0;
}
}
// Normally the trailing wrapper will not be available when a WavPack file is first
// opened for reading because it is stored in the final block of the file. This
// function forces a seek to the end of the file to pick up any trailing wrapper
// stored there (then use WavPackGetWrapper**() to obtain). This can obviously only
// be used for seekable files (not pipes) and is not available for pre-4.0 WavPack
// files.
static void seek_riff_trailer (WavpackContext *wpc);
void WavpackSeekTrailingWrapper (WavpackContext *wpc)
{
if ((wpc->open_flags & OPEN_WRAPPER) &&
wpc->reader->can_seek (wpc->wv_in) && !wpc->stream3) {
uint32_t pos_save = wpc->reader->get_pos (wpc->wv_in);
seek_riff_trailer (wpc);
wpc->reader->set_pos_abs (wpc->wv_in, pos_save);
}
}
// Get any MD5 checksum stored in the metadata (should be called after reading
// last sample or an extra seek will occur). A return value of FALSE indicates
// that no MD5 checksum was stored.
static int seek_md5 (WavpackStreamReader *reader, void *id, unsigned char data [16]);
int WavpackGetMD5Sum (WavpackContext *wpc, unsigned char data [16])
{
if (wpc->config.flags & CONFIG_MD5_CHECKSUM) {
if (wpc->config.md5_read) {
memcpy (data, wpc->config.md5_checksum, 16);
return TRUE;
}
else if (wpc->reader->can_seek (wpc->wv_in)) {
uint32_t pos_save = wpc->reader->get_pos (wpc->wv_in);
wpc->config.md5_read = seek_md5 (wpc->reader, wpc->wv_in, wpc->config.md5_checksum);
wpc->reader->set_pos_abs (wpc->wv_in, pos_save);
if (wpc->config.md5_read) {
memcpy (data, wpc->config.md5_checksum, 16);
return TRUE;
}
else
return FALSE;
}
}
return FALSE;
}
#endif
// Free all memory allocated for raw WavPack blocks (for all allocated streams)
// and free all additonal streams. This does not free the default stream ([0])
// which is always kept around.
static void free_streams (WavpackContext *wpc)
{
int si = wpc->num_streams;
while (si--) {
if (wpc->streams [si]->blockbuff) {
free (wpc->streams [si]->blockbuff);
wpc->streams [si]->blockbuff = NULL;
}
if (wpc->streams [si]->block2buff) {
free (wpc->streams [si]->block2buff);
wpc->streams [si]->block2buff = NULL;
}
if (wpc->streams [si]->sample_buffer) {
free (wpc->streams [si]->sample_buffer);
wpc->streams [si]->sample_buffer = NULL;
}
if (wpc->streams [si]->dc.shaping_data) {
free (wpc->streams [si]->dc.shaping_data);
wpc->streams [si]->dc.shaping_data = NULL;
}
if (si) {
wpc->num_streams--;
free (wpc->streams [si]);
wpc->streams [si] = NULL;
}
}
wpc->current_stream = 0;
}
#if !defined(NO_UNPACK) || defined(INFO_ONLY)
// Read from current file position until a valid 32-byte WavPack 4.0 header is
// found and read into the specified pointer. The number of bytes skipped is
// returned. If no WavPack header is found within 1 meg, then a -1 is returned
// to indicate the error. No additional bytes are read past the header and it
// is returned in the processor's native endian mode. Seeking is not required.
static uint32_t read_next_header (WavpackStreamReader *reader, void *id, WavpackHeader *wphdr)
{
unsigned char buffer [sizeof (*wphdr)], *sp = buffer + sizeof (*wphdr), *ep = sp;
uint32_t bytes_skipped = 0;
int bleft;
while (1) {
if (sp < ep) {
bleft = (int)(ep - sp);
memcpy (buffer, sp, bleft);
}
else
bleft = 0;
if (reader->read_bytes (id, buffer + bleft, sizeof (*wphdr) - bleft) != sizeof (*wphdr) - bleft)
return -1;
sp = buffer;
if (*sp++ == 'w' && *sp == 'v' && *++sp == 'p' && *++sp == 'k' &&
!(*++sp & 1) && sp [2] < 16 && !sp [3] && (sp [2] || sp [1] || *sp >= 24) && sp [5] == 4 &&
sp [4] >= (MIN_STREAM_VERS & 0xff) && sp [4] <= (MAX_STREAM_VERS & 0xff) && sp [18] < 3 && !sp [19]) {
memcpy (wphdr, buffer, sizeof (*wphdr));
little_endian_to_native (wphdr, WavpackHeaderFormat);
return bytes_skipped;
}
while (sp < ep && *sp != 'w')
sp++;
if ((bytes_skipped += (uint32_t)(sp - buffer)) > 1024 * 1024)
return -1;
}
}
// This function is used to seek to end of a file to determine its actual
// length in samples by reading the last header block containing data.
// Currently, all WavPack files contain the sample length in the first block
// containing samples, however this might not always be the case. Obviously,
// this function requires a seekable file or stream and leaves the file
// pointer undefined. A return value of -1 indicates the length could not
// be determined.
static uint32_t seek_final_index (WavpackStreamReader *reader, void *id)
{
uint32_t result = (uint32_t) -1, bcount;
WavpackHeader wphdr;
unsigned char *tempbuff;
if (reader->get_length (id) > 1200000L)
reader->set_pos_rel (id, -1048576L, SEEK_END);
else
reader->set_pos_abs (id, 0);
while (1) {
bcount = read_next_header (reader, id, &wphdr);
if (bcount == (uint32_t) -1)
return result;
tempbuff = malloc (wphdr.ckSize + 8);
memcpy (tempbuff, &wphdr, 32);
if (reader->read_bytes (id, tempbuff + 32, wphdr.ckSize - 24) != wphdr.ckSize - 24) {
free (tempbuff);
return result;
}
free (tempbuff);
if (wphdr.block_samples && (wphdr.flags & FINAL_BLOCK))
result = wphdr.block_index + wphdr.block_samples;
}
}
static int seek_md5 (WavpackStreamReader *reader, void *id, unsigned char data [16])
{
unsigned char meta_id, c1, c2;
uint32_t bcount, meta_bc;
WavpackHeader wphdr;
if (reader->get_length (id) > 1200000L)
reader->set_pos_rel (id, -1048576L, SEEK_END);
while (1) {
bcount = read_next_header (reader, id, &wphdr);
if (bcount == (uint32_t) -1)
return FALSE;
bcount = wphdr.ckSize - sizeof (WavpackHeader) + 8;
while (bcount >= 2) {
if (reader->read_bytes (id, &meta_id, 1) != 1 ||
reader->read_bytes (id, &c1, 1) != 1)
return FALSE;
meta_bc = c1 << 1;
bcount -= 2;
if (meta_id & ID_LARGE) {
if (bcount < 2 || reader->read_bytes (id, &c1, 1) != 1 ||
reader->read_bytes (id, &c2, 1) != 1)
return FALSE;
meta_bc += ((uint32_t) c1 << 9) + ((uint32_t) c2 << 17);
bcount -= 2;
}
if (meta_id == ID_MD5_CHECKSUM)
return (meta_bc == 16 && bcount >= 16 &&
reader->read_bytes (id, data, 16) == 16);
reader->set_pos_rel (id, meta_bc, SEEK_CUR);
bcount -= meta_bc;
}
}
}
static void seek_riff_trailer (WavpackContext *wpc)
{
WavpackStreamReader *reader = wpc->reader;
void *id = wpc->wv_in;
unsigned char meta_id, c1, c2;
uint32_t bcount, meta_bc;
WavpackHeader wphdr;
if (reader->get_length (id) > 1200000L)
reader->set_pos_rel (id, -1048576L, SEEK_END);
while (1) {
bcount = read_next_header (reader, id, &wphdr);
if (bcount == (uint32_t) -1)
return;
bcount = wphdr.ckSize - sizeof (WavpackHeader) + 8;
while (bcount >= 2) {
if (reader->read_bytes (id, &meta_id, 1) != 1 ||
reader->read_bytes (id, &c1, 1) != 1)
return;
meta_bc = c1 << 1;
bcount -= 2;
if (meta_id & ID_LARGE) {
if (bcount < 2 || reader->read_bytes (id, &c1, 1) != 1 ||
reader->read_bytes (id, &c2, 1) != 1)
return;
meta_bc += ((uint32_t) c1 << 9) + ((uint32_t) c2 << 17);
bcount -= 2;
}
if ((meta_id & ID_UNIQUE) == ID_RIFF_TRAILER) {
wpc->wrapper_data = realloc (wpc->wrapper_data, wpc->wrapper_bytes + meta_bc);
if (reader->read_bytes (id, wpc->wrapper_data + wpc->wrapper_bytes, meta_bc) == meta_bc)
wpc->wrapper_bytes += meta_bc;
else
return;
}
else
reader->set_pos_rel (id, meta_bc, SEEK_CUR);
bcount -= meta_bc;
}
}
}
// Compare the regular wv file block header to a potential matching wvc
// file block header and return action code based on analysis:
//
// 0 = use wvc block (assuming rest of block is readable)
// 1 = bad match; try to read next wvc block
// -1 = bad match; ignore wvc file for this block and backup fp (if
// possible) and try to use this block next time
static int match_wvc_header (WavpackHeader *wv_hdr, WavpackHeader *wvc_hdr)
{
if (wv_hdr->block_index == wvc_hdr->block_index &&
wv_hdr->block_samples == wvc_hdr->block_samples) {
int wvi = 0, wvci = 0;
if (wv_hdr->flags == wvc_hdr->flags)
return 0;
if (wv_hdr->flags & INITIAL_BLOCK)
wvi -= 1;
if (wv_hdr->flags & FINAL_BLOCK)
wvi += 1;
if (wvc_hdr->flags & INITIAL_BLOCK)
wvci -= 1;
if (wvc_hdr->flags & FINAL_BLOCK)
wvci += 1;
return (wvci - wvi < 0) ? 1 : -1;
}
if ((int32_t)(wvc_hdr->block_index - wv_hdr->block_index) < 0)
return 1;
else
return -1;
}
// Read the wvc block that matches the regular wv block that has been
// read for the current stream. If an exact match is not found then
// we either keep reading or back up and (possibly) use the block
// later. The skip_wvc flag is set if not matching wvc block is found
// so that we can still decode using only the lossy version (although
// we flag this as an error). A return of FALSE indicates a serious
// error (not just that we missed one wvc block).
static int read_wvc_block (WavpackContext *wpc)
{
WavpackStream *wps = wpc->streams [wpc->current_stream];
uint32_t bcount, file2pos;
WavpackHeader wphdr;
int compare_result;
while (1) {
file2pos = wpc->reader->get_pos (wpc->wvc_in);
bcount = read_next_header (wpc->reader, wpc->wvc_in, &wphdr);
if (bcount == (uint32_t) -1) {
wps->wvc_skip = TRUE;
wpc->crc_errors++;
return FALSE;
}
if (wpc->open_flags & OPEN_STREAMING)
wphdr.block_index = wps->sample_index = 0;
else
wphdr.block_index -= wpc->initial_index;
if (wphdr.flags & INITIAL_BLOCK)
wpc->file2pos = file2pos + bcount;
compare_result = match_wvc_header (&wps->wphdr, &wphdr);
if (!compare_result) {
wps->block2buff = malloc (wphdr.ckSize + 8);
memcpy (wps->block2buff, &wphdr, 32);
if (wpc->reader->read_bytes (wpc->wvc_in, wps->block2buff + 32, wphdr.ckSize - 24) !=
wphdr.ckSize - 24 || (wphdr.flags & UNKNOWN_FLAGS)) {
free (wps->block2buff);
wps->block2buff = NULL;
wps->wvc_skip = TRUE;
wpc->crc_errors++;
return FALSE;
}
wps->wvc_skip = FALSE;
memcpy (&wps->wphdr, &wphdr, 32);
return TRUE;
}
else if (compare_result == -1) {
wps->wvc_skip = TRUE;
wpc->reader->set_pos_rel (wpc->wvc_in, -32, SEEK_CUR);
wpc->crc_errors++;
return TRUE;
}
}
}
#ifndef NO_SEEKING
// Find a valid WavPack header, searching either from the current file position
// (or from the specified position if not -1) and store it (endian corrected)
// at the specified pointer. The return value is the exact file position of the
// header, although we may have actually read past it. Because this function
// is used for seeking to a specific audio sample, it only considers blocks
// that contain audio samples for the initial stream to be valid.
#define BUFSIZE 4096
static uint32_t find_header (WavpackStreamReader *reader, void *id, uint32_t filepos, WavpackHeader *wphdr)
{
unsigned char *buffer = malloc (BUFSIZE), *sp = buffer, *ep = buffer;
if (filepos != (uint32_t) -1 && reader->set_pos_abs (id, filepos)) {
free (buffer);
return -1;
}
while (1) {
int bleft;
if (sp < ep) {
bleft = (int)(ep - sp);
memcpy (buffer, sp, bleft);
ep -= (sp - buffer);
sp = buffer;
}
else {
if (sp > ep)
if (reader->set_pos_rel (id, (int32_t)(sp - ep), SEEK_CUR)) {
free (buffer);
return -1;
}
sp = ep = buffer;
bleft = 0;
}
ep += reader->read_bytes (id, ep, BUFSIZE - bleft);
if (ep - sp < 32) {
free (buffer);
return -1;
}
while (sp + 32 <= ep)
if (*sp++ == 'w' && *sp == 'v' && *++sp == 'p' && *++sp == 'k' &&
!(*++sp & 1) && sp [2] < 16 && !sp [3] && (sp [2] || sp [1] || *sp >= 24) && sp [5] == 4 &&
sp [4] >= (MIN_STREAM_VERS & 0xff) && sp [4] <= (MAX_STREAM_VERS & 0xff) && sp [18] < 3 && !sp [19]) {
memcpy (wphdr, sp - 4, sizeof (*wphdr));
little_endian_to_native (wphdr, WavpackHeaderFormat);
if (wphdr->block_samples && (wphdr->flags & INITIAL_BLOCK)) {
free (buffer);
return reader->get_pos (id) - (ep - sp + 4);
}
if (wphdr->ckSize > 1024)
sp += wphdr->ckSize - 1024;
}
}
}
// Find the WavPack block that contains the specified sample. If "header_pos"
// is zero, then no information is assumed except the total number of samples
// in the file and its size in bytes. If "header_pos" is non-zero then we
// assume that it is the file position of the valid header image contained in
// the first stream and we can limit our search to either the portion above
// or below that point. If a .wvc file is being used, then this must be called
// for that file also.
static uint32_t find_sample (WavpackContext *wpc, void *infile, uint32_t header_pos, uint32_t sample)
{
WavpackStream *wps = wpc->streams [wpc->current_stream];
uint32_t file_pos1 = 0, file_pos2 = wpc->reader->get_length (infile);
uint32_t sample_pos1 = 0, sample_pos2 = wpc->total_samples;
double ratio = 0.96;
int file_skip = 0;
if (sample >= wpc->total_samples)
return -1;
if (header_pos && wps->wphdr.block_samples) {
if (wps->wphdr.block_index > sample) {
sample_pos2 = wps->wphdr.block_index;
file_pos2 = header_pos;
}
else if (wps->wphdr.block_index + wps->wphdr.block_samples <= sample) {
sample_pos1 = wps->wphdr.block_index;
file_pos1 = header_pos;
}
else
return header_pos;
}
while (1) {
double bytes_per_sample;
uint32_t seek_pos;
bytes_per_sample = file_pos2 - file_pos1;
bytes_per_sample /= sample_pos2 - sample_pos1;
seek_pos = file_pos1 + (file_skip ? 32 : 0);
seek_pos += (uint32_t)(bytes_per_sample * (sample - sample_pos1) * ratio);
seek_pos = find_header (wpc->reader, infile, seek_pos, &wps->wphdr);
if (seek_pos != (uint32_t) -1)
wps->wphdr.block_index -= wpc->initial_index;
if (seek_pos == (uint32_t) -1 || seek_pos >= file_pos2) {
if (ratio > 0.0) {
if ((ratio -= 0.24) < 0.0)
ratio = 0.0;
}
else
return -1;
}
else if (wps->wphdr.block_index > sample) {
sample_pos2 = wps->wphdr.block_index;
file_pos2 = seek_pos;
}
else if (wps->wphdr.block_index + wps->wphdr.block_samples <= sample) {
if (seek_pos == file_pos1)
file_skip = 1;
else {
sample_pos1 = wps->wphdr.block_index;
file_pos1 = seek_pos;
}
}
else
return seek_pos;
}
}
#endif
#endif
void WavpackLittleEndianToNative (void *data, char *format)
{
little_endian_to_native (data, format);
}
void WavpackNativeToLittleEndian (void *data, char *format)
{
native_to_little_endian (data, format);
}
uint32_t WavpackGetLibraryVersion (void)
{
return (LIBWAVPACK_MAJOR<<16)
|(LIBWAVPACK_MINOR<<8)
|(LIBWAVPACK_MICRO<<0);
}
const char *WavpackGetLibraryVersionString (void)
{
return LIBWAVPACK_VERSION_STRING;
}
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