diff options
Diffstat (limited to 'lib/wavpack/unpack.c')
| -rw-r--r-- | lib/wavpack/unpack.c | 785 |
1 files changed, 785 insertions, 0 deletions
diff --git a/lib/wavpack/unpack.c b/lib/wavpack/unpack.c new file mode 100644 index 00000000..e169c47f --- /dev/null +++ b/lib/wavpack/unpack.c @@ -0,0 +1,785 @@ +////////////////////////////////////////////////////////////////////////////
+// **** WAVPACK **** //
+// Hybrid Lossless Wavefile Compressor //
+// Copyright (c) 1998 - 2006 Conifer Software. //
+// All Rights Reserved. //
+// Distributed under the BSD Software License (see license.txt) //
+////////////////////////////////////////////////////////////////////////////
+
+// unpack.c
+
+// This module actually handles the decompression of the audio data, except
+// for the entropy decoding which is handled by the words.c module. For
+// maximum efficiency, the conversion is isolated to tight loops that handle
+// an entire buffer.
+
+#include "wavpack.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#define LOSSY_MUTE
+
+///////////////////////////// executable code ////////////////////////////////
+
+// This function initializes everything required to unpack a WavPack block
+// and must be called before unpack_samples() is called to obtain audio data.
+// It is assumed that the WavpackHeader has been read into the wps->wphdr
+// (in the current WavpackStream). This is where all the metadata blocks are
+// scanned up to the one containing the audio bitstream.
+
+int unpack_init (WavpackContext *wpc)
+{
+ WavpackStream *wps = &wpc->stream;
+ WavpackMetadata wpmd;
+
+ if (wps->wphdr.block_samples && wps->wphdr.block_index != (uint32_t) -1)
+ wps->sample_index = wps->wphdr.block_index;
+
+ wps->mute_error = FALSE;
+ wps->crc = 0xffffffff;
+ CLEAR (wps->wvbits);
+ CLEAR (wps->decorr_passes);
+ CLEAR (wps->w);
+
+ while (read_metadata_buff (wpc, &wpmd)) {
+ if (!process_metadata (wpc, &wpmd)) {
+ strcpy (wpc->error_message, "invalid metadata!");
+ return FALSE;
+ }
+
+ if (wpmd.id == ID_WV_BITSTREAM)
+ break;
+ }
+
+ if (wps->wphdr.block_samples && !bs_is_open (&wps->wvbits)) {
+ strcpy (wpc->error_message, "invalid WavPack file!");
+ return FALSE;
+ }
+
+ if (wps->wphdr.block_samples) {
+ if ((wps->wphdr.flags & INT32_DATA) && wps->int32_sent_bits)
+ wpc->lossy_blocks = TRUE;
+
+ if ((wps->wphdr.flags & FLOAT_DATA) &&
+ wps->float_flags & (FLOAT_EXCEPTIONS | FLOAT_ZEROS_SENT | FLOAT_SHIFT_SENT | FLOAT_SHIFT_SAME))
+ wpc->lossy_blocks = TRUE;
+ }
+
+ return TRUE;
+}
+
+// This function initialzes the main bitstream for audio samples, which must
+// be in the "wv" file.
+
+int init_wv_bitstream (WavpackContext *wpc, WavpackMetadata *wpmd)
+{
+ WavpackStream *wps = &wpc->stream;
+
+ if (wpmd->data)
+ bs_open_read (&wps->wvbits, wpmd->data, (unsigned char *) wpmd->data + wpmd->byte_length, NULL, NULL, 0);
+ else if (wpmd->byte_length)
+ bs_open_read (&wps->wvbits, wpc->read_buffer, wpc->read_buffer + sizeof (wpc->read_buffer),
+ wpc->infile, wpc->user_data, wpmd->byte_length + (wpmd->byte_length & 1));
+
+ return TRUE;
+}
+
+// Read decorrelation terms from specified metadata block into the
+// decorr_passes array. The terms range from -3 to 8, plus 17 & 18;
+// other values are reserved and generate errors for now. The delta
+// ranges from 0 to 7 with all values valid. Note that the terms are
+// stored in the opposite order in the decorr_passes array compared
+// to packing.
+
+int read_decorr_terms (WavpackStream *wps, WavpackMetadata *wpmd)
+{
+ int termcnt = wpmd->byte_length;
+ uchar *byteptr = wpmd->data;
+ struct decorr_pass *dpp;
+
+ if (termcnt > MAX_NTERMS)
+ return FALSE;
+
+ wps->num_terms = termcnt;
+
+ for (dpp = wps->decorr_passes + termcnt - 1; termcnt--; dpp--) {
+ dpp->term = (int)(*byteptr & 0x1f) - 5;
+ dpp->delta = (*byteptr++ >> 5) & 0x7;
+
+ if (!dpp->term || dpp->term < -3 || (dpp->term > MAX_TERM && dpp->term < 17) || dpp->term > 18)
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+// Read decorrelation weights from specified metadata block into the
+// decorr_passes array. The weights range +/-1024, but are rounded and
+// truncated to fit in signed chars for metadata storage. Weights are
+// separate for the two channels and are specified from the "last" term
+// (first during encode). Unspecified weights are set to zero.
+
+int read_decorr_weights (WavpackStream *wps, WavpackMetadata *wpmd)
+{
+ int termcnt = wpmd->byte_length, tcount;
+ signed char *byteptr = wpmd->data;
+ struct decorr_pass *dpp;
+
+ if (!(wps->wphdr.flags & MONO_DATA))
+ termcnt /= 2;
+
+ if (termcnt > wps->num_terms)
+ return FALSE;
+
+ for (tcount = wps->num_terms, dpp = wps->decorr_passes; tcount--; dpp++)
+ dpp->weight_A = dpp->weight_B = 0;
+
+ while (--dpp >= wps->decorr_passes && termcnt--) {
+ dpp->weight_A = restore_weight (*byteptr++);
+
+ if (!(wps->wphdr.flags & MONO_DATA))
+ dpp->weight_B = restore_weight (*byteptr++);
+ }
+
+ return TRUE;
+}
+
+// Read decorrelation samples from specified metadata block into the
+// decorr_passes array. The samples are signed 32-bit values, but are
+// converted to signed log2 values for storage in metadata. Values are
+// stored for both channels and are specified from the "last" term
+// (first during encode) with unspecified samples set to zero. The
+// number of samples stored varies with the actual term value, so
+// those must obviously come first in the metadata.
+
+int read_decorr_samples (WavpackStream *wps, WavpackMetadata *wpmd)
+{
+ uchar *byteptr = wpmd->data;
+ uchar *endptr = byteptr + wpmd->byte_length;
+ struct decorr_pass *dpp;
+ int tcount;
+
+ for (tcount = wps->num_terms, dpp = wps->decorr_passes; tcount--; dpp++) {
+ CLEAR (dpp->samples_A);
+ CLEAR (dpp->samples_B);
+ }
+
+ if (wps->wphdr.version == 0x402 && (wps->wphdr.flags & HYBRID_FLAG)) {
+ byteptr += 2;
+
+ if (!(wps->wphdr.flags & MONO_DATA))
+ byteptr += 2;
+ }
+
+ while (dpp-- > wps->decorr_passes && byteptr < endptr)
+ if (dpp->term > MAX_TERM) {
+ dpp->samples_A [0] = exp2s ((short)(byteptr [0] + (byteptr [1] << 8)));
+ dpp->samples_A [1] = exp2s ((short)(byteptr [2] + (byteptr [3] << 8)));
+ byteptr += 4;
+
+ if (!(wps->wphdr.flags & MONO_DATA)) {
+ dpp->samples_B [0] = exp2s ((short)(byteptr [0] + (byteptr [1] << 8)));
+ dpp->samples_B [1] = exp2s ((short)(byteptr [2] + (byteptr [3] << 8)));
+ byteptr += 4;
+ }
+ }
+ else if (dpp->term < 0) {
+ dpp->samples_A [0] = exp2s ((short)(byteptr [0] + (byteptr [1] << 8)));
+ dpp->samples_B [0] = exp2s ((short)(byteptr [2] + (byteptr [3] << 8)));
+ byteptr += 4;
+ }
+ else {
+ int m = 0, cnt = dpp->term;
+
+ while (cnt--) {
+ dpp->samples_A [m] = exp2s ((short)(byteptr [0] + (byteptr [1] << 8)));
+ byteptr += 2;
+
+ if (!(wps->wphdr.flags & MONO_DATA)) {
+ dpp->samples_B [m] = exp2s ((short)(byteptr [0] + (byteptr [1] << 8)));
+ byteptr += 2;
+ }
+
+ m++;
+ }
+ }
+
+ return byteptr == endptr;
+}
+
+// Read the int32 data from the specified metadata into the specified stream.
+// This data is used for integer data that has more than 24 bits of magnitude
+// or, in some cases, used to eliminate redundant bits from any audio stream.
+
+int read_int32_info (WavpackStream *wps, WavpackMetadata *wpmd)
+{
+ int bytecnt = wpmd->byte_length;
+ char *byteptr = wpmd->data;
+
+ if (bytecnt != 4)
+ return FALSE;
+
+ wps->int32_sent_bits = *byteptr++;
+ wps->int32_zeros = *byteptr++;
+ wps->int32_ones = *byteptr++;
+ wps->int32_dups = *byteptr;
+ return TRUE;
+}
+
+// Read multichannel information from metadata. The first byte is the total
+// number of channels and the following bytes represent the channel_mask
+// as described for Microsoft WAVEFORMATEX.
+
+int read_channel_info (WavpackContext *wpc, WavpackMetadata *wpmd)
+{
+ int bytecnt = wpmd->byte_length, shift = 0;
+ char *byteptr = wpmd->data;
+ uint32_t mask = 0;
+
+ if (!bytecnt || bytecnt > 5)
+ return FALSE;
+
+ wpc->config.num_channels = *byteptr++;
+
+ while (--bytecnt) {
+ mask |= (uint32_t) *byteptr++ << shift;
+ shift += 8;
+ }
+
+ wpc->config.channel_mask = mask;
+ return TRUE;
+}
+
+// Read configuration information from metadata.
+
+int read_config_info (WavpackContext *wpc, WavpackMetadata *wpmd)
+{
+ int bytecnt = wpmd->byte_length;
+ uchar *byteptr = wpmd->data;
+
+ if (bytecnt >= 3) {
+ wpc->config.flags &= 0xff;
+ wpc->config.flags |= (int32_t) *byteptr++ << 8;
+ wpc->config.flags |= (int32_t) *byteptr++ << 16;
+ wpc->config.flags |= (int32_t) *byteptr << 24;
+ }
+
+ return TRUE;
+}
+
+// This monster actually unpacks the WavPack bitstream(s) into the specified
+// buffer as 32-bit integers or floats (depending on orignal data). Lossy
+// samples will be clipped to their original limits (i.e. 8-bit samples are
+// clipped to -128/+127) but are still returned in int32_ts. It is up to the
+// caller to potentially reformat this for the final output including any
+// multichannel distribution, block alignment or endian compensation. The
+// function unpack_init() must have been called and the entire WavPack block
+// must still be visible (although wps->blockbuff will not be accessed again).
+// For maximum clarity, the function is broken up into segments that handle
+// various modes. This makes for a few extra infrequent flag checks, but
+// makes the code easier to follow because the nesting does not become so
+// deep. For maximum efficiency, the conversion is isolated to tight loops
+// that handle an entire buffer. The function returns the total number of
+// samples unpacked, which can be less than the number requested if an error
+// occurs or the end of the block is reached.
+
+#if defined(CPU_COLDFIRE) && !defined(SIMULATOR)
+extern void decorr_stereo_pass_cont_mcf5249 (struct decorr_pass *dpp, int32_t *buffer, int32_t sample_count);
+#elif defined(CPU_ARM) && !defined(SIMULATOR)
+extern void decorr_stereo_pass_cont_arm (struct decorr_pass *dpp, int32_t *buffer, int32_t sample_count);
+extern void decorr_stereo_pass_cont_arml (struct decorr_pass *dpp, int32_t *buffer, int32_t sample_count);
+#else
+static void decorr_stereo_pass_cont (struct decorr_pass *dpp, int32_t *buffer, int32_t sample_count);
+#endif
+
+static void decorr_mono_pass (struct decorr_pass *dpp, int32_t *buffer, int32_t sample_count);
+static void decorr_stereo_pass (struct decorr_pass *dpp, int32_t *buffer, int32_t sample_count);
+static void fixup_samples (WavpackStream *wps, int32_t *buffer, uint32_t sample_count);
+
+int32_t unpack_samples (WavpackContext *wpc, int32_t *buffer, uint32_t sample_count)
+{
+ WavpackStream *wps = &wpc->stream;
+ uint32_t flags = wps->wphdr.flags, crc = wps->crc, i;
+ int32_t mute_limit = (1L << ((flags & MAG_MASK) >> MAG_LSB)) + 2;
+ struct decorr_pass *dpp;
+ int32_t *bptr, *eptr;
+ int tcount;
+
+ if (wps->sample_index + sample_count > wps->wphdr.block_index + wps->wphdr.block_samples)
+ sample_count = wps->wphdr.block_index + wps->wphdr.block_samples - wps->sample_index;
+
+ if (wps->mute_error) {
+ memset (buffer, 0, sample_count * (flags & MONO_FLAG ? 4 : 8));
+ wps->sample_index += sample_count;
+ return sample_count;
+ }
+
+ if (flags & HYBRID_FLAG)
+ mute_limit *= 2;
+
+ ///////////////////// handle version 4 mono data /////////////////////////
+
+ if (flags & MONO_DATA) {
+ eptr = buffer + sample_count;
+ i = get_words (buffer, sample_count, flags, &wps->w, &wps->wvbits);
+
+ for (tcount = wps->num_terms, dpp = wps->decorr_passes; tcount--; dpp++)
+ decorr_mono_pass (dpp, buffer, sample_count);
+
+ for (bptr = buffer; bptr < eptr; ++bptr) {
+ if (labs (bptr [0]) > mute_limit) {
+ i = bptr - buffer;
+ break;
+ }
+
+ crc = crc * 3 + bptr [0];
+ }
+ }
+
+ //////////////////// handle version 4 stereo data ////////////////////////
+
+ else {
+ eptr = buffer + (sample_count * 2);
+ i = get_words (buffer, sample_count, flags, &wps->w, &wps->wvbits);
+
+ if (sample_count < 16)
+ for (tcount = wps->num_terms, dpp = wps->decorr_passes; tcount--; dpp++)
+ decorr_stereo_pass (dpp, buffer, sample_count);
+ else
+ for (tcount = wps->num_terms, dpp = wps->decorr_passes; tcount--; dpp++) {
+ decorr_stereo_pass (dpp, buffer, 8);
+#if defined(CPU_COLDFIRE) && !defined(SIMULATOR)
+ decorr_stereo_pass_cont_mcf5249 (dpp, buffer + 16, sample_count - 8);
+#elif defined(CPU_ARM) && !defined(SIMULATOR)
+ if (((flags & MAG_MASK) >> MAG_LSB) > 15)
+ decorr_stereo_pass_cont_arml (dpp, buffer + 16, sample_count - 8);
+ else
+ decorr_stereo_pass_cont_arm (dpp, buffer + 16, sample_count - 8);
+#else
+ decorr_stereo_pass_cont (dpp, buffer + 16, sample_count - 8);
+#endif
+ }
+
+ if (flags & JOINT_STEREO)
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ bptr [0] += (bptr [1] -= (bptr [0] >> 1));
+
+ if (labs (bptr [0]) > mute_limit || labs (bptr [1]) > mute_limit) {
+ i = (bptr - buffer) / 2;
+ break;
+ }
+
+ crc = (crc * 3 + bptr [0]) * 3 + bptr [1];
+ }
+ else
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ if (labs (bptr [0]) > mute_limit || labs (bptr [1]) > mute_limit) {
+ i = (bptr - buffer) / 2;
+ break;
+ }
+
+ crc = (crc * 3 + bptr [0]) * 3 + bptr [1];
+ }
+ }
+
+ if (i != sample_count) {
+ memset (buffer, 0, sample_count * (flags & MONO_FLAG ? 4 : 8));
+ wps->mute_error = TRUE;
+ i = sample_count;
+ }
+
+ fixup_samples (wps, buffer, i);
+
+ if (flags & FALSE_STEREO) {
+ int32_t *dptr = buffer + i * 2;
+ int32_t *sptr = buffer + i;
+ int32_t c = i;
+
+ while (c--) {
+ *--dptr = *--sptr;
+ *--dptr = *sptr;
+ }
+ }
+
+ wps->sample_index += i;
+ wps->crc = crc;
+
+ return i;
+}
+
+static void decorr_stereo_pass (struct decorr_pass *dpp, int32_t *buffer, int32_t sample_count)
+{
+ int32_t delta = dpp->delta, weight_A = dpp->weight_A, weight_B = dpp->weight_B;
+ int32_t *bptr, *eptr = buffer + (sample_count * 2), sam_A, sam_B;
+ int m, k;
+
+ switch (dpp->term) {
+
+ case 17:
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ sam_A = 2 * dpp->samples_A [0] - dpp->samples_A [1];
+ dpp->samples_A [1] = dpp->samples_A [0];
+ dpp->samples_A [0] = apply_weight (weight_A, sam_A) + bptr [0];
+ update_weight (weight_A, delta, sam_A, bptr [0]);
+ bptr [0] = dpp->samples_A [0];
+
+ sam_A = 2 * dpp->samples_B [0] - dpp->samples_B [1];
+ dpp->samples_B [1] = dpp->samples_B [0];
+ dpp->samples_B [0] = apply_weight (weight_B, sam_A) + bptr [1];
+ update_weight (weight_B, delta, sam_A, bptr [1]);
+ bptr [1] = dpp->samples_B [0];
+ }
+
+ break;
+
+ case 18:
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ sam_A = (3 * dpp->samples_A [0] - dpp->samples_A [1]) >> 1;
+ dpp->samples_A [1] = dpp->samples_A [0];
+ dpp->samples_A [0] = apply_weight (weight_A, sam_A) + bptr [0];
+ update_weight (weight_A, delta, sam_A, bptr [0]);
+ bptr [0] = dpp->samples_A [0];
+
+ sam_A = (3 * dpp->samples_B [0] - dpp->samples_B [1]) >> 1;
+ dpp->samples_B [1] = dpp->samples_B [0];
+ dpp->samples_B [0] = apply_weight (weight_B, sam_A) + bptr [1];
+ update_weight (weight_B, delta, sam_A, bptr [1]);
+ bptr [1] = dpp->samples_B [0];
+ }
+
+ break;
+
+ default:
+ for (m = 0, k = dpp->term & (MAX_TERM - 1), bptr = buffer; bptr < eptr; bptr += 2) {
+ sam_A = dpp->samples_A [m];
+ dpp->samples_A [k] = apply_weight (weight_A, sam_A) + bptr [0];
+ update_weight (weight_A, delta, sam_A, bptr [0]);
+ bptr [0] = dpp->samples_A [k];
+
+ sam_A = dpp->samples_B [m];
+ dpp->samples_B [k] = apply_weight (weight_B, sam_A) + bptr [1];
+ update_weight (weight_B, delta, sam_A, bptr [1]);
+ bptr [1] = dpp->samples_B [k];
+
+ m = (m + 1) & (MAX_TERM - 1);
+ k = (k + 1) & (MAX_TERM - 1);
+ }
+
+ if (m) {
+ int32_t temp_samples [MAX_TERM];
+
+ memcpy (temp_samples, dpp->samples_A, sizeof (dpp->samples_A));
+
+ for (k = 0; k < MAX_TERM; k++, m++)
+ dpp->samples_A [k] = temp_samples [m & (MAX_TERM - 1)];
+
+ memcpy (temp_samples, dpp->samples_B, sizeof (dpp->samples_B));
+
+ for (k = 0; k < MAX_TERM; k++, m++)
+ dpp->samples_B [k] = temp_samples [m & (MAX_TERM - 1)];
+ }
+
+ break;
+
+ case -1:
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ sam_A = bptr [0] + apply_weight (weight_A, dpp->samples_A [0]);
+ update_weight_clip (weight_A, delta, dpp->samples_A [0], bptr [0]);
+ bptr [0] = sam_A;
+ dpp->samples_A [0] = bptr [1] + apply_weight (weight_B, sam_A);
+ update_weight_clip (weight_B, delta, sam_A, bptr [1]);
+ bptr [1] = dpp->samples_A [0];
+ }
+
+ break;
+
+ case -2:
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ sam_B = bptr [1] + apply_weight (weight_B, dpp->samples_B [0]);
+ update_weight_clip (weight_B, delta, dpp->samples_B [0], bptr [1]);
+ bptr [1] = sam_B;
+ dpp->samples_B [0] = bptr [0] + apply_weight (weight_A, sam_B);
+ update_weight_clip (weight_A, delta, sam_B, bptr [0]);
+ bptr [0] = dpp->samples_B [0];
+ }
+
+ break;
+
+ case -3:
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ sam_A = bptr [0] + apply_weight (weight_A, dpp->samples_A [0]);
+ update_weight_clip (weight_A, delta, dpp->samples_A [0], bptr [0]);
+ sam_B = bptr [1] + apply_weight (weight_B, dpp->samples_B [0]);
+ update_weight_clip (weight_B, delta, dpp->samples_B [0], bptr [1]);
+ bptr [0] = dpp->samples_B [0] = sam_A;
+ bptr [1] = dpp->samples_A [0] = sam_B;
+ }
+
+ break;
+ }
+
+ dpp->weight_A = weight_A;
+ dpp->weight_B = weight_B;
+}
+
+#if (!defined(CPU_COLDFIRE) && !defined(CPU_ARM)) || defined(SIMULATOR)
+
+static void decorr_stereo_pass_cont (struct decorr_pass *dpp, int32_t *buffer, int32_t sample_count)
+{
+ int32_t delta = dpp->delta, weight_A = dpp->weight_A, weight_B = dpp->weight_B;
+ int32_t *bptr, *tptr, *eptr = buffer + (sample_count * 2), sam_A, sam_B;
+ int k, i;
+
+ switch (dpp->term) {
+
+ case 17:
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ sam_A = 2 * bptr [-2] - bptr [-4];
+ bptr [0] = apply_weight (weight_A, sam_A) + (sam_B = bptr [0]);
+ update_weight (weight_A, delta, sam_A, sam_B);
+
+ sam_A = 2 * bptr [-1] - bptr [-3];
+ bptr [1] = apply_weight (weight_B, sam_A) + (sam_B = bptr [1]);
+ update_weight (weight_B, delta, sam_A, sam_B);
+ }
+
+ dpp->samples_B [0] = bptr [-1];
+ dpp->samples_A [0] = bptr [-2];
+ dpp->samples_B [1] = bptr [-3];
+ dpp->samples_A [1] = bptr [-4];
+ break;
+
+ case 18:
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ sam_A = (3 * bptr [-2] - bptr [-4]) >> 1;
+ bptr [0] = apply_weight (weight_A, sam_A) + (sam_B = bptr [0]);
+ update_weight (weight_A, delta, sam_A, sam_B);
+
+ sam_A = (3 * bptr [-1] - bptr [-3]) >> 1;
+ bptr [1] = apply_weight (weight_B, sam_A) + (sam_B = bptr [1]);
+ update_weight (weight_B, delta, sam_A, sam_B);
+ }
+
+ dpp->samples_B [0] = bptr [-1];
+ dpp->samples_A [0] = bptr [-2];
+ dpp->samples_B [1] = bptr [-3];
+ dpp->samples_A [1] = bptr [-4];
+ break;
+
+ default:
+ for (bptr = buffer, tptr = buffer - (dpp->term * 2); bptr < eptr; bptr += 2, tptr += 2) {
+ bptr [0] = apply_weight (weight_A, tptr [0]) + (sam_A = bptr [0]);
+ update_weight (weight_A, delta, tptr [0], sam_A);
+
+ bptr [1] = apply_weight (weight_B, tptr [1]) + (sam_A = bptr [1]);
+ update_weight (weight_B, delta, tptr [1], sam_A);
+ }
+
+ for (k = dpp->term - 1, i = 8; i--; k--) {
+ dpp->samples_B [k & (MAX_TERM - 1)] = *--bptr;
+ dpp->samples_A [k & (MAX_TERM - 1)] = *--bptr;
+ }
+
+ break;
+
+ case -1:
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ bptr [0] = apply_weight (weight_A, bptr [-1]) + (sam_A = bptr [0]);
+ update_weight_clip (weight_A, delta, bptr [-1], sam_A);
+ bptr [1] = apply_weight (weight_B, bptr [0]) + (sam_A = bptr [1]);
+ update_weight_clip (weight_B, delta, bptr [0], sam_A);
+ }
+
+ dpp->samples_A [0] = bptr [-1];
+ break;
+
+ case -2:
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ bptr [1] = apply_weight (weight_B, bptr [-2]) + (sam_A = bptr [1]);
+ update_weight_clip (weight_B, delta, bptr [-2], sam_A);
+ bptr [0] = apply_weight (weight_A, bptr [1]) + (sam_A = bptr [0]);
+ update_weight_clip (weight_A, delta, bptr [1], sam_A);
+ }
+
+ dpp->samples_B [0] = bptr [-2];
+ break;
+
+ case -3:
+ for (bptr = buffer; bptr < eptr; bptr += 2) {
+ bptr [0] = apply_weight (weight_A, bptr [-1]) + (sam_A = bptr [0]);
+ update_weight_clip (weight_A, delta, bptr [-1], sam_A);
+ bptr [1] = apply_weight (weight_B, bptr [-2]) + (sam_A = bptr [1]);
+ update_weight_clip (weight_B, delta, bptr [-2], sam_A);
+ }
+
+ dpp->samples_A [0] = bptr [-1];
+ dpp->samples_B [0] = bptr [-2];
+ break;
+ }
+
+ dpp->weight_A = weight_A;
+ dpp->weight_B = weight_B;
+}
+
+#endif
+
+static void decorr_mono_pass (struct decorr_pass *dpp, int32_t *buffer, int32_t sample_count)
+{
+ int32_t delta = dpp->delta, weight_A = dpp->weight_A;
+ int32_t *bptr, *eptr = buffer + sample_count, sam_A;
+ int m, k;
+
+ switch (dpp->term) {
+
+ case 17:
+ for (bptr = buffer; bptr < eptr; bptr++) {
+ sam_A = 2 * dpp->samples_A [0] - dpp->samples_A [1];
+ dpp->samples_A [1] = dpp->samples_A [0];
+ dpp->samples_A [0] = apply_weight (weight_A, sam_A) + bptr [0];
+ update_weight (weight_A, delta, sam_A, bptr [0]);
+ bptr [0] = dpp->samples_A [0];
+ }
+
+ break;
+
+ case 18:
+ for (bptr = buffer; bptr < eptr; bptr++) {
+ sam_A = (3 * dpp->samples_A [0] - dpp->samples_A [1]) >> 1;
+ dpp->samples_A [1] = dpp->samples_A [0];
+ dpp->samples_A [0] = apply_weight (weight_A, sam_A) + bptr [0];
+ update_weight (weight_A, delta, sam_A, bptr [0]);
+ bptr [0] = dpp->samples_A [0];
+ }
+
+ break;
+
+ default:
+ for (m = 0, k = dpp->term & (MAX_TERM - 1), bptr = buffer; bptr < eptr; bptr++) {
+ sam_A = dpp->samples_A [m];
+ dpp->samples_A [k] = apply_weight (weight_A, sam_A) + bptr [0];
+ update_weight (weight_A, delta, sam_A, bptr [0]);
+ bptr [0] = dpp->samples_A [k];
+ m = (m + 1) & (MAX_TERM - 1);
+ k = (k + 1) & (MAX_TERM - 1);
+ }
+
+ if (m) {
+ int32_t temp_samples [MAX_TERM];
+
+ memcpy (temp_samples, dpp->samples_A, sizeof (dpp->samples_A));
+
+ for (k = 0; k < MAX_TERM; k++, m++)
+ dpp->samples_A [k] = temp_samples [m & (MAX_TERM - 1)];
+ }
+
+ break;
+ }
+
+ dpp->weight_A = weight_A;
+}
+
+
+// This is a helper function for unpack_samples() that applies several final
+// operations. First, if the data is 32-bit float data, then that conversion
+// is done in the float.c module (whether lossy or lossless) and we return.
+// Otherwise, if the extended integer data applies, then that operation is
+// executed first. If the unpacked data is lossy (and not corrected) then
+// it is clipped and shifted in a single operation. Otherwise, if it's
+// lossless then the last step is to apply the final shift (if any).
+
+static void fixup_samples (WavpackStream *wps, int32_t *buffer, uint32_t sample_count)
+{
+ uint32_t flags = wps->wphdr.flags;
+ int shift = (flags & SHIFT_MASK) >> SHIFT_LSB;
+
+ if (flags & FLOAT_DATA) {
+ float_values (wps, buffer, (flags & MONO_FLAG) ? sample_count : sample_count * 2);
+ return;
+ }
+
+ if (flags & INT32_DATA) {
+ uint32_t count = (flags & MONO_FLAG) ? sample_count : sample_count * 2;
+ int sent_bits = wps->int32_sent_bits, zeros = wps->int32_zeros;
+ int ones = wps->int32_ones, dups = wps->int32_dups;
+ int32_t *dptr = buffer;
+
+ if (!(flags & HYBRID_FLAG) && !sent_bits && (zeros + ones + dups))
+ while (count--) {
+ if (zeros)
+ *dptr <<= zeros;
+ else if (ones)
+ *dptr = ((*dptr + 1) << ones) - 1;
+ else if (dups)
+ *dptr = ((*dptr + (*dptr & 1)) << dups) - (*dptr & 1);
+
+ dptr++;
+ }
+ else
+ shift += zeros + sent_bits + ones + dups;
+ }
+
+ if (flags & HYBRID_FLAG) {
+ int32_t min_value, max_value, min_shifted, max_shifted;
+
+ switch (flags & BYTES_STORED) {
+ case 0:
+ min_shifted = (min_value = -128 >> shift) << shift;
+ max_shifted = (max_value = 127 >> shift) << shift;
+ break;
+
+ case 1:
+ min_shifted = (min_value = -32768 >> shift) << shift;
+ max_shifted = (max_value = 32767 >> shift) << shift;
+ break;
+
+ case 2:
+ min_shifted = (min_value = -8388608 >> shift) << shift;
+ max_shifted = (max_value = 8388607 >> shift) << shift;
+ break;
+
+ case 3:
+ default:
+ min_shifted = (min_value = (int32_t) 0x80000000 >> shift) << shift;
+ max_shifted = (max_value = (int32_t) 0x7FFFFFFF >> shift) << shift;
+ break;
+ }
+
+ if (!(flags & MONO_FLAG))
+ sample_count *= 2;
+
+ while (sample_count--) {
+ if (*buffer < min_value)
+ *buffer++ = min_shifted;
+ else if (*buffer > max_value)
+ *buffer++ = max_shifted;
+ else
+ *buffer++ <<= shift;
+ }
+ }
+ else if (shift) {
+ if (!(flags & MONO_FLAG))
+ sample_count *= 2;
+
+ while (sample_count--)
+ *buffer++ <<= shift;
+ }
+}
+
+// This function checks the crc value(s) for an unpacked block, returning the
+// number of actual crc errors detected for the block. The block must be
+// completely unpacked before this test is valid. For losslessly unpacked
+// blocks of float or extended integer data the extended crc is also checked.
+// Note that WavPack's crc is not a CCITT approved polynomial algorithm, but
+// is a much simpler method that is virtually as robust for real world data.
+
+int check_crc_error (WavpackContext *wpc)
+{
+ WavpackStream *wps = &wpc->stream;
+ int result = 0;
+
+ if (wps->crc != wps->wphdr.crc)
+ ++result;
+
+ return result;
+}
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