1 files changed, 555 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libwavpack/wputils.c b/lib/rbcodec/codecs/libwavpack/wputils.c
new file mode 100644
index 0000000000..b0ccd3ba83
--- /dev/null
+++ b/lib/rbcodec/codecs/libwavpack/wputils.c
@@ -0,0 +1,555 @@
+////////////////////////////////////////////////////////////////////////////
+//                           **** WAVPACK ****                            //
+//                  Hybrid Lossless Wavefile Compressor                   //
+//              Copyright (c) 1998 - 2004 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>
+
+static void strcpy_loc (char *dst, char *src) { while ((*dst++ = *src++) != 0); }
+
+///////////////////////////// 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 IBSS_ATTR;
+
+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_loc (error, "invalid WavPack file!");
+            return NULL;
+        }
+
+        wps->block_bytes_left = wps->wphdr.ckSize - 24;
+
+        if ((wps->wphdr.flags & UNKNOWN_FLAGS) || wps->wphdr.version < MIN_STREAM_VERS ||
+            wps->wphdr.version > MAX_STREAM_VERS) {
+                strcpy_loc (error, "invalid 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_loc (error, wpc.error_message [0] ? wpc.error_message :
+                "invalid 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.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
+// 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 int32_t's for stereo files. The audio data is returned right-justified in
+// 32-bit int32_t's 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 is normalized to +/-1.0). 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;
+
+                wps->block_bytes_left = wps->wphdr.ckSize - 24;
+
+                if (wps->wphdr.version < MIN_STREAM_VERS || wps->wphdr.version > MAX_STREAM_VERS) {
+                    strcpy_loc (wpc->error_message, "invalid WavPack file!");
+                    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 int32_t's, 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 int32_t buffer and must be
+// left-shifted 8, 16, or 24 bits if normalized int32_t's 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) > 1024 * 1024)
+            return -1;
+    }
+}
+
+// Open context for writing WavPack files. The returned context pointer is used
+// in all following calls to the library. A return value of NULL indicates
+// that memory could not be allocated for the context.
+
+WavpackContext *WavpackOpenFileOutput (void)
+{
+    CLEAR (wpc);
+    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->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
+
+// config->bitrate              hybrid bitrate in either bits/sample or kbps
+// config->shaping_weight       hybrid noise shaping coefficient override
+// config->float_norm_exp       select floating-point data (127 for +/-1.0)
+
+// 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)
+{
+    WavpackStream *wps = &wpc->stream;
+    uint32_t flags = (config->bytes_per_sample - 1), shift = 0;
+    int num_chans = config->num_channels;
+    int i;
+
+    if ((wpc->config.flags & CONFIG_HYBRID_FLAG) ||
+        wpc->config.float_norm_exp ||
+        num_chans < 1 || num_chans > 2)
+            return FALSE;
+
+    wpc->total_samples = total_samples;
+    wpc->config.sample_rate = config->sample_rate;
+    wpc->config.num_channels = config->num_channels;
+    wpc->config.bits_per_sample = config->bits_per_sample;
+    wpc->config.bytes_per_sample = config->bytes_per_sample;
+    wpc->config.flags = config->flags;
+
+    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;
+    flags |= CROSS_DECORR;
+
+    if (!(config->flags & CONFIG_JOINT_OVERRIDE) || (config->flags & CONFIG_JOINT_STEREO))
+        flags |= JOINT_STEREO;
+
+    flags |= INITIAL_BLOCK | FINAL_BLOCK;
+
+    if (num_chans == 1) {
+        flags &= ~(JOINT_STEREO | CROSS_DECORR | HYBRID_BALANCE);
+        flags |= MONO_FLAG;
+    }
+
+    flags &= ~MAG_MASK;
+    flags += (1 << MAG_LSB) * ((flags & BYTES_STORED) * 8 + 7);
+
+    memcpy (wps->wphdr.ckID, "wvpk", 4);
+    wps->wphdr.ckSize = sizeof (WavpackHeader) - 8;
+    wps->wphdr.total_samples = wpc->total_samples;
+    wps->wphdr.version = CUR_STREAM_VERS;
+    wps->wphdr.flags = flags;
+
+    pack_init (wpc);
+    return TRUE;
+}
+
+// Add wrapper (currently RIFF only) to WavPack blocks. This should be called
+// before sending any audio samples. 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.
+
+void WavpackAddWrapper (WavpackContext *wpc, void *data, uint32_t bcount)
+{
+    wpc->wrapper_data = data;
+    wpc->wrapper_bytes = bcount;
+}
+
+// Start a WavPack block to be stored in the specified buffer. This must be
+// called before calling WavpackPackSamples(). Note that writing CANNOT wrap
+// in the buffer; the entire output block must fit in the buffer.
+
+int WavpackStartBlock (WavpackContext *wpc, uchar *begin, uchar *end)
+{
+    wpc->stream.blockbuff = begin;
+    wpc->stream.blockend = end;
+    return pack_start_block (wpc);
+}
+
+// Pack the specified samples. Samples must be stored in int32_ts 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. The caller must decide how many samples to place in each
+// WavPack block (1/2 second is common), but this function may be called as
+// many times as desired to build the final block (and performs the actual
+// compression during the call). A return of FALSE indicates an error.
+
+int WavpackPackSamples (WavpackContext *wpc, int32_t *sample_buffer, uint32_t sample_count)
+{
+    if (!sample_count || pack_samples (wpc, sample_buffer, sample_count))
+        return TRUE;
+
+    strcpy_loc (wpc->error_message, "output buffer overflowed!");
+    return FALSE;
+}
+
+// Finish the WavPack block being built, returning the total size of the
+// block in bytes. Note that the possible conversion of the WavPack header to
+// little-endian takes place here.
+
+uint32_t WavpackFinishBlock (WavpackContext *wpc)
+{
+    WavpackStream *wps = &wpc->stream;
+    uint32_t bcount;
+
+    pack_finish_block (wpc);
+    bcount = ((WavpackHeader *) wps->blockbuff)->ckSize + 8;
+    native_to_little_endian ((WavpackHeader *) wps->blockbuff, WavpackHeaderFormat);
+
+    return bcount;
+}
+
+// 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. 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)
+{
+    little_endian_to_native (wpc, WavpackHeaderFormat);
+    ((WavpackHeader *) first_block)->total_samples = WavpackGetSampleIndex (wpc);
+    native_to_little_endian (wpc, WavpackHeaderFormat);
+}
+
+// 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.
+// 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 *WavpackGetWrapperLocation (void *first_block)
+{
+    if (((uchar *) first_block) [32] == ID_RIFF_HEADER)
+        return ((uchar *) first_block) + 34;
+    else
+        return NULL;
+}
+