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Diffstat (limited to 'src/wavpack/wputils.c')
| -rw-r--r-- | src/wavpack/wputils.c | 351 |
1 files changed, 0 insertions, 351 deletions
diff --git a/src/wavpack/wputils.c b/src/wavpack/wputils.c deleted file mode 100644 index 0d71af53..00000000 --- a/src/wavpack/wputils.c +++ /dev/null @@ -1,351 +0,0 @@ -//////////////////////////////////////////////////////////////////////////// -// **** 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 for decoding WavPack 4.0 audio -// streams and files. WavPack data is read with a stream reading callback. No -// direct seeking is provided for, but it is possible to start decoding -// anywhere in a WavPack stream. In this case, WavPack will be able to provide -// the sample-accurate position when it synchs with the data and begins -// decoding. - -#include "wavpack.h" - -#include <string.h> - -///////////////////////////// local table storage //////////////////////////// - -const uint32_t sample_rates [] = { 6000, 8000, 9600, 11025, 12000, 16000, 22050, - 24000, 32000, 44100, 48000, 64000, 88200, 96000, 192000 }; - -///////////////////////////// executable code //////////////////////////////// - -static uint32_t read_next_header (read_stream infile, WavpackHeader *wphdr); - -// This function reads data from the specified stream in search of a valid -// WavPack 4.0 audio block. If this fails in 1 megabyte (or an invalid or -// unsupported WavPack block is encountered) then an appropriate message is -// copied to "error" and NULL is returned, otherwise a pointer to a -// WavpackContext structure is returned (which is used to call all other -// functions in this module). This can be initiated at the beginning of a -// WavPack file, or anywhere inside a WavPack file. To determine the exact -// position within the file use WavpackGetSampleIndex(). For demonstration -// purposes this uses a single static copy of the WavpackContext structure, -// so obviously it cannot be used for more than one file at a time. Also, -// this function will not handle "correction" files, plays only the first -// two channels of multi-channel files, and is limited in resolution in some -// large integer or floating point files (but always provides at least 24 bits -// of resolution). - -static WavpackContext wpc; - -WavpackContext *WavpackOpenFileInput (read_stream infile, char *error) -{ - WavpackStream *wps = &wpc.stream; - uint32_t bcount; - - CLEAR (wpc); - wpc.infile = infile; - wpc.total_samples = (uint32_t) -1; - wpc.norm_offset = 0; - wpc.open_flags = 0; - - // open the source file for reading and store the size - - while (!wps->wphdr.block_samples) { - - bcount = read_next_header (wpc.infile, &wps->wphdr); - - if (bcount == (uint32_t) -1) { - strcpy (error, "not compatible with this version of WavPack file!"); - return NULL; - } - - if (wps->wphdr.block_samples && wps->wphdr.total_samples != (uint32_t) -1) - wpc.total_samples = wps->wphdr.total_samples; - - if (!unpack_init (&wpc)) { - strcpy (error, wpc.error_message [0] ? wpc.error_message : - "not compatible with this version of WavPack file!"); - - return NULL; - } - } - - 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.flags & FLOAT_DATA) { - wpc.config.bytes_per_sample = 3; - wpc.config.bits_per_sample = 24; - } - - 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 (!(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 file and returns -// a mask with the following bit values: - -// MODE_LOSSLESS: file is lossless (pure lossless only) -// MODE_HYBRID: file is hybrid mode (lossy part only) -// MODE_FLOAT: audio data is 32-bit ieee floating point (but will provided -// in 24-bit integers for convenience) -// MODE_HIGH: file was created in "high" mode (information only) -// MODE_FAST: file was created in "fast" mode (information only) - -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->lossy_blocks) - mode &= ~MODE_LOSSLESS; - - if (wpc->config.flags & CONFIG_FLOAT_DATA) - mode |= MODE_FLOAT; - - if (wpc->config.flags & CONFIG_HIGH_FLAG) - mode |= MODE_HIGH; - - if (wpc->config.flags & CONFIG_FAST_FLAG) - mode |= MODE_FAST; - } - - return mode; -} - -// 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. 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 will be returned as 24-bit integers (and may -// also be clipped). 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. - -uint32_t WavpackUnpackSamples (WavpackContext *wpc, int32_t *buffer, uint32_t samples) -{ - WavpackStream *wps = &wpc->stream; - uint32_t bcount, samples_unpacked = 0, samples_to_unpack; - int num_channels = wpc->config.num_channels; - - while (samples) { - if (!wps->wphdr.block_samples || !(wps->wphdr.flags & INITIAL_BLOCK) || - wps->sample_index >= wps->wphdr.block_index + wps->wphdr.block_samples) { - bcount = read_next_header (wpc->infile, &wps->wphdr); - - if (bcount == (uint32_t) -1) - break; - - if (!wps->wphdr.block_samples || wps->sample_index == wps->wphdr.block_index) - if (!unpack_init (wpc)) - break; - } - - 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 > 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; - - unpack_samples (wpc, buffer, samples_to_unpack); - - 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)) - wpc->crc_errors++; - } - - if (wps->sample_index == wpc->total_samples) - break; - } - - return samples_unpacked; -} - -// 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) - return wpc->stream.sample_index; - - 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; -} - -// 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, but this -// version can only decode the first two. - -int WavpackGetNumChannels (WavpackContext *wpc) -{ - return wpc ? wpc->config.num_channels : 2; -} - -// 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 longs, 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; -} - -// 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 multi-channel file. - -int WavpackGetReducedChannels (WavpackContext *wpc) -{ - if (wpc) - return wpc->reduced_channels ? wpc->reduced_channels : wpc->config.num_channels; - else - return 2; -} - -// 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 (read_stream infile, WavpackHeader *wphdr) -{ - char buffer [sizeof (*wphdr)], *sp = buffer + sizeof (*wphdr), *ep = sp; - uint32_t bytes_skipped = 0; - int bleft; - - while (1) { - if (sp < ep) { - bleft = ep - sp; - memcpy (buffer, sp, bleft); - } - else - bleft = 0; - - if (infile (buffer + bleft, sizeof (*wphdr) - bleft) != (int32_t) sizeof (*wphdr) - bleft) - return -1; - - sp = buffer; - - if (*sp++ == 'w' && *sp == 'v' && *++sp == 'p' && *++sp == 'k' && - !(*++sp & 1) && sp [2] < 16 && !sp [3] && sp [5] == 4 && - sp [4] >= (MIN_STREAM_VERS & 0xff) && sp [4] <= (MAX_STREAM_VERS & 0xff)) { - memcpy (wphdr, buffer, sizeof (*wphdr)); - little_endian_to_native (wphdr, WavpackHeaderFormat); - return bytes_skipped; - } - - while (sp < ep && *sp != 'w') - sp++; - - if ((bytes_skipped += sp - buffer) > 1048576L) - return -1; - } -} |