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cog/Frameworks/WavPack/Files/unpack3_open.c

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////////////////////////////////////////////////////////////////////////////
// **** WAVPACK **** //
// Hybrid Lossless Wavefile Compressor //
// Copyright (c) 1998 - 2013 Conifer Software. //
// All Rights Reserved. //
// Distributed under the BSD Software License (see license.txt) //
////////////////////////////////////////////////////////////////////////////
// unpack3_open.c
// This module provides an extension to the open_utils.c module for handling
// WavPack files prior to version 4.0, not including "raw" files. As these
// modes are all obsolete and are no longer written, this code will not be
// fully documented other than the global functions. However, full documentation
// is provided in the version 3.97 source code. Note that this module only
// provides the functionality of opening the files and obtaining information
// from them; the actual audio decoding is located in the unpack3.c module.
#ifdef ENABLE_LEGACY
#include <stdlib.h>
#include <string.h>
#include "wavpack_local.h"
#include "unpack3.h"
#define ATTEMPT_ERROR_MUTING
// This provides an extension to the WavpackOpenFileRead () function contained
// in the wputils.c module. It is assumed that an 'R' had been read as the
// first character of the file/stream (indicating a non-raw pre version 4.0
// WavPack file) and had been pushed back onto the stream (or simply seeked
// back to).
WavpackContext *open_file3 (WavpackContext *wpc, char *error)
{
RiffChunkHeader RiffChunkHeader;
ChunkHeader ChunkHeader;
WavpackHeader3 wphdr;
WavpackStream3 *wps;
WaveHeader3 wavhdr;
CLEAR (wavhdr);
wpc->stream3 = wps = (WavpackStream3 *) malloc (sizeof (WavpackStream3));
CLEAR (*wps);
if (wpc->reader->read_bytes (wpc->wv_in, &RiffChunkHeader, sizeof (RiffChunkHeader)) !=
sizeof (RiffChunkHeader)) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
if (!strncmp (RiffChunkHeader.ckID, "RIFF", 4) && !strncmp (RiffChunkHeader.formType, "WAVE", 4)) {
if (wpc->open_flags & OPEN_WRAPPER) {
wpc->wrapper_data = (unsigned char *)malloc (wpc->wrapper_bytes = sizeof (RiffChunkHeader));
memcpy (wpc->wrapper_data, &RiffChunkHeader, sizeof (RiffChunkHeader));
}
// If the first chunk is a wave RIFF header, then read the various chunks
// until we get to the "data" chunk (and WavPack header should follow). If
// the first chunk is not a RIFF, then we assume a "raw" WavPack file and
// the WavPack header must be first.
while (1) {
if (wpc->reader->read_bytes (wpc->wv_in, &ChunkHeader, sizeof (ChunkHeader)) !=
sizeof (ChunkHeader)) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
else {
if (wpc->open_flags & OPEN_WRAPPER) {
wpc->wrapper_data = (unsigned char *)realloc (wpc->wrapper_data, wpc->wrapper_bytes + sizeof (ChunkHeader));
memcpy (wpc->wrapper_data + wpc->wrapper_bytes, &ChunkHeader, sizeof (ChunkHeader));
wpc->wrapper_bytes += sizeof (ChunkHeader);
}
WavpackLittleEndianToNative (&ChunkHeader, ChunkHeaderFormat);
if (!strncmp (ChunkHeader.ckID, "fmt ", 4)) {
if (ChunkHeader.ckSize < sizeof (wavhdr) ||
wpc->reader->read_bytes (wpc->wv_in, &wavhdr, sizeof (wavhdr)) != sizeof (wavhdr)) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
else if (wpc->open_flags & OPEN_WRAPPER) {
wpc->wrapper_data = (unsigned char *)realloc (wpc->wrapper_data, wpc->wrapper_bytes + sizeof (wavhdr));
memcpy (wpc->wrapper_data + wpc->wrapper_bytes, &wavhdr, sizeof (wavhdr));
wpc->wrapper_bytes += sizeof (wavhdr);
}
WavpackLittleEndianToNative (&wavhdr, WaveHeader3Format);
if (ChunkHeader.ckSize > sizeof (wavhdr)) {
uint32_t bytes_to_skip = (ChunkHeader.ckSize + 1 - sizeof (wavhdr)) & ~1L;
if (bytes_to_skip > 1024 * 1024) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
if (wpc->open_flags & OPEN_WRAPPER) {
wpc->wrapper_data = (unsigned char *)realloc (wpc->wrapper_data, wpc->wrapper_bytes + bytes_to_skip);
wpc->reader->read_bytes (wpc->wv_in, wpc->wrapper_data + wpc->wrapper_bytes, bytes_to_skip);
wpc->wrapper_bytes += bytes_to_skip;
}
else {
unsigned char *temp = (unsigned char *)malloc (bytes_to_skip);
wpc->reader->read_bytes (wpc->wv_in, temp, bytes_to_skip);
free (temp);
}
}
}
else if (!strncmp (ChunkHeader.ckID, "data", 4))
break;
else if ((ChunkHeader.ckSize + 1) & ~1L) {
uint32_t bytes_to_skip = (ChunkHeader.ckSize + 1) & ~1L;
if (bytes_to_skip > 1024 * 1024) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
if (wpc->open_flags & OPEN_WRAPPER) {
wpc->wrapper_data = (unsigned char *)realloc (wpc->wrapper_data, wpc->wrapper_bytes + bytes_to_skip);
wpc->reader->read_bytes (wpc->wv_in, wpc->wrapper_data + wpc->wrapper_bytes, bytes_to_skip);
wpc->wrapper_bytes += bytes_to_skip;
}
else {
unsigned char *temp = (unsigned char *)malloc (bytes_to_skip);
wpc->reader->read_bytes (wpc->wv_in, temp, bytes_to_skip);
free (temp);
}
}
}
}
}
else {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
if (wavhdr.FormatTag != 1 || !wavhdr.NumChannels || wavhdr.NumChannels > 2 ||
!wavhdr.SampleRate || wavhdr.BitsPerSample < 16 || wavhdr.BitsPerSample > 24 ||
wavhdr.BlockAlign / wavhdr.NumChannels > 3 || wavhdr.BlockAlign % wavhdr.NumChannels ||
wavhdr.BlockAlign / wavhdr.NumChannels < (wavhdr.BitsPerSample + 7) / 8) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
wpc->total_samples = ChunkHeader.ckSize / wavhdr.NumChannels /
((wavhdr.BitsPerSample > 16) ? 3 : 2);
if (wpc->reader->read_bytes (wpc->wv_in, &wphdr, 10) != 10) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
if (((char *) &wphdr) [8] == 2 && (wpc->reader->read_bytes (wpc->wv_in, ((char *) &wphdr) + 10, 2) != 2)) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
else if (((char *) &wphdr) [8] == 3 && (wpc->reader->read_bytes (wpc->wv_in, ((char *) &wphdr) + 10,
sizeof (wphdr) - 10) != sizeof (wphdr) - 10)) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
WavpackLittleEndianToNative (&wphdr, WavpackHeader3Format);
// make sure this is a version we know about
if (strncmp (wphdr.ckID, "wvpk", 4) || wphdr.version < 1 || wphdr.version > 3) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
// Because I ran out of flag bits in the WavPack header, an amazingly ugly
// kludge was forced upon me! This code takes care of preparing the flags
// field for internal use and checking for unknown formats we can't decode
if (wphdr.version == 3) {
if (wphdr.flags & EXTREME_DECORR) {
if ((wphdr.flags & NOT_STORED_FLAGS) ||
((wphdr.bits) &&
(((wphdr.flags & NEW_HIGH_FLAG) &&
(wphdr.flags & (FAST_FLAG | HIGH_FLAG))) ||
(wphdr.flags & CROSS_DECORR)))) {
if (error) strcpy (error, "not a valid WavPack file!");
return WavpackCloseFile (wpc);
}
if (wphdr.flags & CANCEL_EXTREME)
wphdr.flags &= ~(EXTREME_DECORR | CANCEL_EXTREME);
}
else
wphdr.flags &= ~CROSS_DECORR;
}
// check to see if we should look for a "correction" file, and if so try
// to open it for reading, then set WVC_FLAG accordingly
if (wpc->wvc_in && wphdr.version == 3 && wphdr.bits && (wphdr.flags & NEW_HIGH_FLAG)) {
wpc->file2len = wpc->reader->get_length (wpc->wvc_in);
wphdr.flags |= WVC_FLAG;
wpc->wvc_flag = TRUE;
}
else
wphdr.flags &= ~WVC_FLAG;
// check WavPack version to handle special requirements of versions
// before 3.0 that had smaller headers
if (wphdr.version < 3) {
wphdr.total_samples = (int32_t) wpc->total_samples;
wphdr.flags = wavhdr.NumChannels == 1 ? MONO_FLAG : 0;
wphdr.shift = 16 - wavhdr.BitsPerSample;
if (wphdr.version == 1)
wphdr.bits = 0;
}
wpc->config.sample_rate = wavhdr.SampleRate;
wpc->config.num_channels = wavhdr.NumChannels;
wpc->config.channel_mask = 5 - wavhdr.NumChannels;
if (wphdr.flags & MONO_FLAG)
wpc->config.flags |= CONFIG_MONO_FLAG;
if (wphdr.flags & EXTREME_DECORR)
wpc->config.flags |= CONFIG_HIGH_FLAG;
if (wphdr.bits) {
if (wphdr.flags & NEW_HIGH_FLAG)
wpc->config.flags |= CONFIG_HYBRID_FLAG;
else
wpc->config.flags |= CONFIG_LOSSY_MODE;
}
else if (!(wphdr.flags & HIGH_FLAG))
wpc->config.flags |= CONFIG_FAST_FLAG;
wpc->config.bytes_per_sample = (wphdr.flags & BYTES_3) ? 3 : 2;
wpc->config.bits_per_sample = wavhdr.BitsPerSample;
memcpy (&wps->wphdr, &wphdr, sizeof (wphdr));
wps->wvbits.bufsiz = wps->wvcbits.bufsiz = 1024 * 1024;
return wpc;
}
// return currently decoded sample index
uint32_t get_sample_index3 (WavpackContext *wpc)
{
WavpackStream3 *wps = (WavpackStream3 *) wpc->stream3;
return (wps) ? wps->sample_index : (uint32_t) -1;
}
int get_version3 (WavpackContext *wpc)
{
WavpackStream3 *wps = (WavpackStream3 *) wpc->stream3;
return (wps) ? wps->wphdr.version : 0;
}
void free_stream3 (WavpackContext *wpc)
{
WavpackStream3 *wps = (WavpackStream3 *) wpc->stream3;
if (wps) {
#ifndef NO_SEEKING
if (wps->unpack_data)
free (wps->unpack_data);
#endif
if ((wps->wphdr.flags & WVC_FLAG) && wps->wvcbits.buf)
free (wps->wvcbits.buf);
if (wps->wvbits.buf)
free (wps->wvbits.buf);
free (wps);
}
}
#endif // ENABLE_LEGACY
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