--- /dev/null
+/*
+** Copyright (C) 1999-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
+**
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU Lesser General Public License as published by
+** the Free Software Foundation; either version 2.1 of the License, or
+** (at your option) any later version.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+** GNU Lesser General Public License for more details.
+**
+** You should have received a copy of the GNU Lesser General Public License
+** along with this program; if not, write to the Free Software
+** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
+
+#include "sfconfig.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include "sndfile.h"
+#include "sfendian.h"
+#include "common.h"
+
+typedef struct IMA_ADPCM_PRIVATE_tag
+{ int (*decode_block) (SF_PRIVATE *psf, struct IMA_ADPCM_PRIVATE_tag *pima) ;
+ int (*encode_block) (SF_PRIVATE *psf, struct IMA_ADPCM_PRIVATE_tag *pima) ;
+
+ int channels, blocksize, samplesperblock, blocks ;
+ int blockcount, samplecount ;
+ int previous [2] ;
+ int stepindx [2] ;
+ unsigned char *block ;
+ short *samples ;
+#if HAVE_FLEXIBLE_ARRAY
+ short data [] ; /* ISO C99 struct flexible array. */
+#else
+ short data [0] ; /* This is a hack and might not work. */
+#endif
+} IMA_ADPCM_PRIVATE ;
+
+/*============================================================================================
+** Predefined IMA ADPCM data.
+*/
+
+static int ima_indx_adjust [16] =
+{ -1, -1, -1, -1, /* +0 - +3, decrease the step size */
+ 2, 4, 6, 8, /* +4 - +7, increase the step size */
+ -1, -1, -1, -1, /* -0 - -3, decrease the step size */
+ 2, 4, 6, 8, /* -4 - -7, increase the step size */
+} ;
+
+static int ima_step_size [89] =
+{ 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
+ 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130, 143, 157, 173, 190, 209, 230,
+ 253, 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, 876, 963,
+ 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327,
+ 3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630, 9493, 10442,
+ 11487, 12635, 13899, 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794,
+ 32767
+} ;
+
+static int ima_reader_init (SF_PRIVATE *psf, int blockalign, int samplesperblock) ;
+static int ima_writer_init (SF_PRIVATE *psf, int blockalign) ;
+
+static int ima_read_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, short *ptr, int len) ;
+static int ima_write_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, const short *ptr, int len) ;
+
+static sf_count_t ima_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
+static sf_count_t ima_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
+static sf_count_t ima_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
+static sf_count_t ima_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
+
+static sf_count_t ima_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len) ;
+static sf_count_t ima_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len) ;
+static sf_count_t ima_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len) ;
+static sf_count_t ima_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len) ;
+
+static sf_count_t ima_seek (SF_PRIVATE *psf, int mode, sf_count_t offset) ;
+
+static int ima_close (SF_PRIVATE *psf) ;
+
+static int wav_w64_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ;
+static int wav_w64_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ;
+
+/*-static int aiff_ima_reader_init (SF_PRIVATE *psf, int blockalign, int samplesperblock) ;-*/
+static int aiff_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ;
+static int aiff_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima) ;
+
+
+static inline int
+clamp_ima_step_index (int indx)
+{ if (indx < 0)
+ return 0 ;
+ if (indx >= ARRAY_LEN (ima_step_size))
+ return ARRAY_LEN (ima_step_size) - 1 ;
+
+ return indx ;
+} /* clamp_ima_step_index */
+
+/*============================================================================================
+** IMA ADPCM Reader initialisation function.
+*/
+
+int
+wav_w64_ima_init (SF_PRIVATE *psf, int blockalign, int samplesperblock)
+{ int error ;
+
+ if (psf->codec_data != NULL)
+ { psf_log_printf (psf, "*** psf->codec_data is not NULL.\n") ;
+ return SFE_INTERNAL ;
+ } ;
+
+ if (psf->file.mode == SFM_RDWR)
+ return SFE_BAD_MODE_RW ;
+
+ if (psf->file.mode == SFM_READ)
+ if ((error = ima_reader_init (psf, blockalign, samplesperblock)))
+ return error ;
+
+ if (psf->file.mode == SFM_WRITE)
+ if ((error = ima_writer_init (psf, blockalign)))
+ return error ;
+
+ psf->codec_close = ima_close ;
+ psf->seek = ima_seek ;
+
+ return 0 ;
+} /* wav_w64_ima_init */
+
+int
+aiff_ima_init (SF_PRIVATE *psf, int blockalign, int samplesperblock)
+{ int error ;
+
+ if (psf->file.mode == SFM_RDWR)
+ return SFE_BAD_MODE_RW ;
+
+ if (psf->file.mode == SFM_READ)
+ if ((error = ima_reader_init (psf, blockalign, samplesperblock)))
+ return error ;
+
+ if (psf->file.mode == SFM_WRITE)
+ if ((error = ima_writer_init (psf, blockalign)))
+ return error ;
+
+ psf->codec_close = ima_close ;
+
+ return 0 ;
+} /* aiff_ima_init */
+
+static int
+ima_close (SF_PRIVATE *psf)
+{ IMA_ADPCM_PRIVATE *pima ;
+
+ pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
+
+ if (psf->file.mode == SFM_WRITE)
+ { /* If a block has been partially assembled, write it out
+ ** as the final block.
+ */
+ if (pima->samplecount && pima->samplecount < pima->samplesperblock)
+ pima->encode_block (psf, pima) ;
+
+ psf->sf.frames = pima->samplesperblock * pima->blockcount / psf->sf.channels ;
+ } ;
+
+ return 0 ;
+} /* ima_close */
+
+/*============================================================================================
+** IMA ADPCM Read Functions.
+*/
+
+static int
+ima_reader_init (SF_PRIVATE *psf, int blockalign, int samplesperblock)
+{ IMA_ADPCM_PRIVATE *pima ;
+ int pimasize, count ;
+
+ if (psf->file.mode != SFM_READ)
+ return SFE_BAD_MODE_RW ;
+
+ pimasize = sizeof (IMA_ADPCM_PRIVATE) + blockalign * psf->sf.channels + 3 * psf->sf.channels * samplesperblock ;
+
+ if (! (pima = calloc (1, pimasize)))
+ return SFE_MALLOC_FAILED ;
+
+ psf->codec_data = (void*) pima ;
+
+ pima->samples = pima->data ;
+ pima->block = (unsigned char*) (pima->data + samplesperblock * psf->sf.channels) ;
+
+ pima->channels = psf->sf.channels ;
+ pima->blocksize = blockalign ;
+ pima->samplesperblock = samplesperblock ;
+
+ psf->filelength = psf_get_filelen (psf) ;
+ psf->datalength = (psf->dataend) ? psf->dataend - psf->dataoffset :
+ psf->filelength - psf->dataoffset ;
+
+ if (pima->blocksize == 0)
+ { psf_log_printf (psf, "*** Error : pima->blocksize should not be zero.\n") ;
+ return SFE_INTERNAL ;
+ } ;
+
+ if (psf->datalength % pima->blocksize)
+ pima->blocks = psf->datalength / pima->blocksize + 1 ;
+ else
+ pima->blocks = psf->datalength / pima->blocksize ;
+
+ switch (SF_CONTAINER (psf->sf.format))
+ { case SF_FORMAT_WAV :
+ case SF_FORMAT_W64 :
+ count = 2 * (pima->blocksize - 4 * pima->channels) / pima->channels + 1 ;
+
+ if (pima->samplesperblock != count)
+ { psf_log_printf (psf, "*** Error : samplesperblock should be %d.\n", count) ;
+ return SFE_INTERNAL ;
+ } ;
+
+ pima->decode_block = wav_w64_ima_decode_block ;
+
+ psf->sf.frames = pima->samplesperblock * pima->blocks ;
+ break ;
+
+ case SF_FORMAT_AIFF :
+ psf_log_printf (psf, "still need to check block count\n") ;
+ pima->decode_block = aiff_ima_decode_block ;
+ psf->sf.frames = pima->samplesperblock * pima->blocks / pima->channels ;
+ break ;
+
+ default :
+ psf_log_printf (psf, "ima_reader_init: bad psf->sf.format\n") ;
+ return SFE_INTERNAL ;
+ } ;
+
+ pima->decode_block (psf, pima) ; /* Read first block. */
+
+ psf->read_short = ima_read_s ;
+ psf->read_int = ima_read_i ;
+ psf->read_float = ima_read_f ;
+ psf->read_double = ima_read_d ;
+
+ return 0 ;
+} /* ima_reader_init */
+
+static int
+aiff_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima)
+{ unsigned char *blockdata ;
+ int chan, k, diff, bytecode, predictor ;
+ short step, stepindx, *sampledata ;
+
+static int count = 0 ;
+count ++ ;
+
+ pima->blockcount += pima->channels ;
+ pima->samplecount = 0 ;
+
+ if (pima->blockcount > pima->blocks)
+ { memset (pima->samples, 0, pima->samplesperblock * pima->channels * sizeof (short)) ;
+ return 1 ;
+ } ;
+
+ if ((k = psf_fread (pima->block, 1, pima->blocksize * pima->channels, psf)) != pima->blocksize * pima->channels)
+ psf_log_printf (psf, "*** Warning : short read (%d != %d).\n", k, pima->blocksize) ;
+
+ /* Read and check the block header. */
+ for (chan = 0 ; chan < pima->channels ; chan++)
+ { blockdata = pima->block + chan * 34 ;
+ sampledata = pima->samples + chan ;
+
+ predictor = (blockdata [0] << 8) | (blockdata [1] & 0x80) ;
+
+ stepindx = blockdata [1] & 0x7F ;
+ stepindx = clamp_ima_step_index (stepindx) ;
+
+ /*
+ ** Pull apart the packed 4 bit samples and store them in their
+ ** correct sample positions.
+ */
+ for (k = 0 ; k < pima->blocksize - 2 ; k++)
+ { bytecode = blockdata [k + 2] ;
+ sampledata [pima->channels * (2 * k + 0)] = bytecode & 0xF ;
+ sampledata [pima->channels * (2 * k + 1)] = (bytecode >> 4) & 0xF ;
+ } ;
+
+ /* Decode the encoded 4 bit samples. */
+ for (k = 0 ; k < pima->samplesperblock ; k ++)
+ { step = ima_step_size [stepindx] ;
+
+ bytecode = pima->samples [pima->channels * k + chan] ;
+
+ stepindx += ima_indx_adjust [bytecode] ;
+ stepindx = clamp_ima_step_index (stepindx) ;
+
+ diff = step >> 3 ;
+ if (bytecode & 1) diff += step >> 2 ;
+ if (bytecode & 2) diff += step >> 1 ;
+ if (bytecode & 4) diff += step ;
+ if (bytecode & 8) diff = -diff ;
+
+ predictor += diff ;
+ if (predictor < -32768)
+ predictor = -32768 ;
+ else if (predictor > 32767)
+ predictor = 32767 ;
+
+ pima->samples [pima->channels * k + chan] = predictor ;
+ } ;
+ } ;
+
+ return 1 ;
+} /* aiff_ima_decode_block */
+
+static int
+aiff_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima)
+{ int chan, k, step, diff, vpdiff, blockindx, indx ;
+ short bytecode, mask ;
+
+ /* Encode the block header. */
+ for (chan = 0 ; chan < pima->channels ; chan ++)
+ { blockindx = chan * pima->blocksize ;
+
+ pima->block [blockindx] = (pima->samples [chan] >> 8) & 0xFF ;
+ pima->block [blockindx + 1] = (pima->samples [chan] & 0x80) + (pima->stepindx [chan] & 0x7F) ;
+
+ pima->previous [chan] = pima->samples [chan] ;
+ } ;
+
+ /* Encode second and later samples for every block as a 4 bit value. */
+ for (k = pima->channels ; k < (pima->samplesperblock * pima->channels) ; k ++)
+ { chan = (pima->channels > 1) ? (k % 2) : 0 ;
+
+ diff = pima->samples [k] - pima->previous [chan] ;
+
+ bytecode = 0 ;
+ step = ima_step_size [pima->stepindx [chan]] ;
+ vpdiff = step >> 3 ;
+ if (diff < 0)
+ { bytecode = 8 ;
+ diff = -diff ;
+ } ;
+ mask = 4 ;
+ while (mask)
+ { if (diff >= step)
+ { bytecode |= mask ;
+ diff -= step ;
+ vpdiff += step ;
+ } ;
+ step >>= 1 ;
+ mask >>= 1 ;
+ } ;
+
+ if (bytecode & 8)
+ pima->previous [chan] -= vpdiff ;
+ else
+ pima->previous [chan] += vpdiff ;
+
+ if (pima->previous [chan] > 32767)
+ pima->previous [chan] = 32767 ;
+ else if (pima->previous [chan] < -32768)
+ pima->previous [chan] = -32768 ;
+
+ pima->stepindx [chan] += ima_indx_adjust [bytecode] ;
+
+ pima->stepindx [chan] = clamp_ima_step_index (pima->stepindx [chan]) ;
+ pima->samples [k] = bytecode ;
+ } ;
+
+ /* Pack the 4 bit encoded samples. */
+
+ for (chan = 0 ; chan < pima->channels ; chan ++)
+ { for (indx = pima->channels ; indx < pima->channels * pima->samplesperblock ; indx += 2 * pima->channels)
+ { blockindx = chan * pima->blocksize + 2 + indx / 2 ;
+
+ pima->block [blockindx] = pima->samples [indx] & 0x0F ;
+ pima->block [blockindx] |= (pima->samples [indx + chan] << 4) & 0xF0 ;
+ } ;
+ } ;
+
+ /* Write the block to disk. */
+
+ if ((k = psf_fwrite (pima->block, 1, pima->channels * pima->blocksize, psf)) != pima->channels * pima->blocksize)
+ psf_log_printf (psf, "*** Warning : short write (%d != %d).\n", k, pima->channels * pima->blocksize) ;
+
+ memset (pima->samples, 0, pima->channels * pima->samplesperblock * sizeof (short)) ;
+ pima->samplecount = 0 ;
+ pima->blockcount ++ ;
+
+ return 1 ;
+} /* aiff_ima_encode_block */
+
+static int
+wav_w64_ima_decode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima)
+{ int chan, k, predictor, blockindx, indx, indxstart, diff ;
+ short step, bytecode, stepindx [2] ;
+
+ pima->blockcount ++ ;
+ pima->samplecount = 0 ;
+
+ if (pima->blockcount > pima->blocks)
+ { memset (pima->samples, 0, pima->samplesperblock * pima->channels * sizeof (short)) ;
+ return 1 ;
+ } ;
+
+ if ((k = psf_fread (pima->block, 1, pima->blocksize, psf)) != pima->blocksize)
+ psf_log_printf (psf, "*** Warning : short read (%d != %d).\n", k, pima->blocksize) ;
+
+ /* Read and check the block header. */
+
+ for (chan = 0 ; chan < pima->channels ; chan++)
+ { predictor = pima->block [chan*4] | (pima->block [chan*4+1] << 8) ;
+ if (predictor & 0x8000)
+ predictor -= 0x10000 ;
+
+ stepindx [chan] = pima->block [chan*4+2] ;
+ stepindx [chan] = clamp_ima_step_index (stepindx [chan]) ;
+
+
+ if (pima->block [chan*4+3] != 0)
+ psf_log_printf (psf, "IMA ADPCM synchronisation error.\n") ;
+
+ pima->samples [chan] = predictor ;
+ } ;
+
+ /*
+ ** Pull apart the packed 4 bit samples and store them in their
+ ** correct sample positions.
+ */
+
+ blockindx = 4 * pima->channels ;
+
+ indxstart = pima->channels ;
+ while (blockindx < pima->blocksize)
+ { for (chan = 0 ; chan < pima->channels ; chan++)
+ { indx = indxstart + chan ;
+ for (k = 0 ; k < 4 ; k++)
+ { bytecode = pima->block [blockindx++] ;
+ pima->samples [indx] = bytecode & 0x0F ;
+ indx += pima->channels ;
+ pima->samples [indx] = (bytecode >> 4) & 0x0F ;
+ indx += pima->channels ;
+ } ;
+ } ;
+ indxstart += 8 * pima->channels ;
+ } ;
+
+ /* Decode the encoded 4 bit samples. */
+
+ for (k = pima->channels ; k < (pima->samplesperblock * pima->channels) ; k ++)
+ { chan = (pima->channels > 1) ? (k % 2) : 0 ;
+
+ bytecode = pima->samples [k] & 0xF ;
+
+ step = ima_step_size [stepindx [chan]] ;
+ predictor = pima->samples [k - pima->channels] ;
+
+ diff = step >> 3 ;
+ if (bytecode & 1)
+ diff += step >> 2 ;
+ if (bytecode & 2)
+ diff += step >> 1 ;
+ if (bytecode & 4)
+ diff += step ;
+ if (bytecode & 8)
+ diff = -diff ;
+
+ predictor += diff ;
+
+ if (predictor > 32767)
+ predictor = 32767 ;
+ else if (predictor < -32768)
+ predictor = -32768 ;
+
+ stepindx [chan] += ima_indx_adjust [bytecode] ;
+ stepindx [chan] = clamp_ima_step_index (stepindx [chan]) ;
+
+ pima->samples [k] = predictor ;
+ } ;
+
+ return 1 ;
+} /* wav_w64_ima_decode_block */
+
+static int
+wav_w64_ima_encode_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima)
+{ int chan, k, step, diff, vpdiff, blockindx, indx, indxstart ;
+ short bytecode, mask ;
+
+ /* Encode the block header. */
+ for (chan = 0 ; chan < pima->channels ; chan++)
+ { pima->block [chan*4] = pima->samples [chan] & 0xFF ;
+ pima->block [chan*4+1] = (pima->samples [chan] >> 8) & 0xFF ;
+
+ pima->block [chan*4+2] = pima->stepindx [chan] ;
+ pima->block [chan*4+3] = 0 ;
+
+ pima->previous [chan] = pima->samples [chan] ;
+ } ;
+
+ /* Encode the samples as 4 bit. */
+
+ for (k = pima->channels ; k < (pima->samplesperblock * pima->channels) ; k ++)
+ { chan = (pima->channels > 1) ? (k % 2) : 0 ;
+
+ diff = pima->samples [k] - pima->previous [chan] ;
+
+ bytecode = 0 ;
+ step = ima_step_size [pima->stepindx [chan]] ;
+ vpdiff = step >> 3 ;
+ if (diff < 0)
+ { bytecode = 8 ;
+ diff = -diff ;
+ } ;
+ mask = 4 ;
+ while (mask)
+ { if (diff >= step)
+ { bytecode |= mask ;
+ diff -= step ;
+ vpdiff += step ;
+ } ;
+ step >>= 1 ;
+ mask >>= 1 ;
+ } ;
+
+ if (bytecode & 8)
+ pima->previous [chan] -= vpdiff ;
+ else
+ pima->previous [chan] += vpdiff ;
+
+ if (pima->previous [chan] > 32767)
+ pima->previous [chan] = 32767 ;
+ else if (pima->previous [chan] < -32768)
+ pima->previous [chan] = -32768 ;
+
+ pima->stepindx [chan] += ima_indx_adjust [bytecode] ;
+ pima->stepindx [chan] = clamp_ima_step_index (pima->stepindx [chan]) ;
+
+ pima->samples [k] = bytecode ;
+ } ;
+
+ /* Pack the 4 bit encoded samples. */
+
+ blockindx = 4 * pima->channels ;
+
+ indxstart = pima->channels ;
+ while (blockindx < pima->blocksize)
+ { for (chan = 0 ; chan < pima->channels ; chan++)
+ { indx = indxstart + chan ;
+ for (k = 0 ; k < 4 ; k++)
+ { pima->block [blockindx] = pima->samples [indx] & 0x0F ;
+ indx += pima->channels ;
+ pima->block [blockindx] |= (pima->samples [indx] << 4) & 0xF0 ;
+ indx += pima->channels ;
+ blockindx ++ ;
+ } ;
+ } ;
+ indxstart += 8 * pima->channels ;
+ } ;
+
+ /* Write the block to disk. */
+
+ if ((k = psf_fwrite (pima->block, 1, pima->blocksize, psf)) != pima->blocksize)
+ psf_log_printf (psf, "*** Warning : short write (%d != %d).\n", k, pima->blocksize) ;
+
+ memset (pima->samples, 0, pima->samplesperblock * sizeof (short)) ;
+ pima->samplecount = 0 ;
+ pima->blockcount ++ ;
+
+ return 1 ;
+} /* wav_w64_ima_encode_block */
+
+static int
+ima_read_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, short *ptr, int len)
+{ int count, total = 0, indx = 0 ;
+
+ while (indx < len)
+ { if (pima->blockcount >= pima->blocks && pima->samplecount >= pima->samplesperblock)
+ { memset (&(ptr [indx]), 0, (size_t) ((len - indx) * sizeof (short))) ;
+ return total ;
+ } ;
+
+ if (pima->samplecount >= pima->samplesperblock)
+ pima->decode_block (psf, pima) ;
+
+ count = (pima->samplesperblock - pima->samplecount) * pima->channels ;
+ count = (len - indx > count) ? count : len - indx ;
+
+ memcpy (&(ptr [indx]), &(pima->samples [pima->samplecount * pima->channels]), count * sizeof (short)) ;
+ indx += count ;
+ pima->samplecount += count / pima->channels ;
+ total = indx ;
+ } ;
+
+ return total ;
+} /* ima_read_block */
+
+static sf_count_t
+ima_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len)
+{ IMA_ADPCM_PRIVATE *pima ;
+ int readcount, count ;
+ sf_count_t total = 0 ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
+
+ while (len > 0)
+ { readcount = (len > 0x10000000) ? 0x10000000 : (int) len ;
+
+ count = ima_read_block (psf, pima, ptr, readcount) ;
+
+ total += count ;
+ len -= count ;
+ if (count != readcount)
+ break ;
+ } ;
+
+ return total ;
+} /* ima_read_s */
+
+static sf_count_t
+ima_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len)
+{ IMA_ADPCM_PRIVATE *pima ;
+ short *sptr ;
+ int k, bufferlen, readcount, count ;
+ sf_count_t total = 0 ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
+
+ sptr = psf->u.sbuf ;
+ bufferlen = ARRAY_LEN (psf->u.sbuf) ;
+ while (len > 0)
+ { readcount = (len >= bufferlen) ? bufferlen : (int) len ;
+ count = ima_read_block (psf, pima, sptr, readcount) ;
+ for (k = 0 ; k < readcount ; k++)
+ ptr [total + k] = ((int) sptr [k]) << 16 ;
+ total += count ;
+ len -= readcount ;
+ if (count != readcount)
+ break ;
+ } ;
+
+ return total ;
+} /* ima_read_i */
+
+static sf_count_t
+ima_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len)
+{ IMA_ADPCM_PRIVATE *pima ;
+ short *sptr ;
+ int k, bufferlen, readcount, count ;
+ sf_count_t total = 0 ;
+ float normfact ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
+
+ normfact = (psf->norm_float == SF_TRUE) ? 1.0 / ((float) 0x8000) : 1.0 ;
+
+ sptr = psf->u.sbuf ;
+ bufferlen = ARRAY_LEN (psf->u.sbuf) ;
+ while (len > 0)
+ { readcount = (len >= bufferlen) ? bufferlen : (int) len ;
+ count = ima_read_block (psf, pima, sptr, readcount) ;
+ for (k = 0 ; k < readcount ; k++)
+ ptr [total + k] = normfact * (float) (sptr [k]) ;
+ total += count ;
+ len -= readcount ;
+ if (count != readcount)
+ break ;
+ } ;
+
+ return total ;
+} /* ima_read_f */
+
+static sf_count_t
+ima_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len)
+{ IMA_ADPCM_PRIVATE *pima ;
+ short *sptr ;
+ int k, bufferlen, readcount, count ;
+ sf_count_t total = 0 ;
+ double normfact ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
+
+ normfact = (psf->norm_double == SF_TRUE) ? 1.0 / ((double) 0x8000) : 1.0 ;
+
+ sptr = psf->u.sbuf ;
+ bufferlen = ARRAY_LEN (psf->u.sbuf) ;
+ while (len > 0)
+ { readcount = (len >= bufferlen) ? bufferlen : (int) len ;
+ count = ima_read_block (psf, pima, sptr, readcount) ;
+ for (k = 0 ; k < readcount ; k++)
+ ptr [total + k] = normfact * (double) (sptr [k]) ;
+ total += count ;
+ len -= readcount ;
+ if (count != readcount)
+ break ;
+ } ;
+
+ return total ;
+} /* ima_read_d */
+
+static sf_count_t
+ima_seek (SF_PRIVATE *psf, int mode, sf_count_t offset)
+{ IMA_ADPCM_PRIVATE *pima ;
+ int newblock, newsample ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
+
+ if (psf->datalength < 0 || psf->dataoffset < 0)
+ { psf->error = SFE_BAD_SEEK ;
+ return PSF_SEEK_ERROR ;
+ } ;
+
+ if (offset == 0)
+ { psf_fseek (psf, psf->dataoffset, SEEK_SET) ;
+ pima->blockcount = 0 ;
+ pima->decode_block (psf, pima) ;
+ pima->samplecount = 0 ;
+ return 0 ;
+ } ;
+
+ if (offset < 0 || offset > pima->blocks * pima->samplesperblock)
+ { psf->error = SFE_BAD_SEEK ;
+ return PSF_SEEK_ERROR ;
+ } ;
+
+ newblock = offset / pima->samplesperblock ;
+ newsample = offset % pima->samplesperblock ;
+
+ if (mode == SFM_READ)
+ { psf_fseek (psf, psf->dataoffset + newblock * pima->blocksize, SEEK_SET) ;
+ pima->blockcount = newblock ;
+ pima->decode_block (psf, pima) ;
+ pima->samplecount = newsample ;
+ }
+ else
+ { /* What to do about write??? */
+ psf->error = SFE_BAD_SEEK ;
+ return PSF_SEEK_ERROR ;
+ } ;
+
+ return newblock * pima->samplesperblock + newsample ;
+} /* ima_seek */
+
+/*==========================================================================================
+** IMA ADPCM Write Functions.
+*/
+
+static int
+ima_writer_init (SF_PRIVATE *psf, int blockalign)
+{ IMA_ADPCM_PRIVATE *pima ;
+ int samplesperblock ;
+ unsigned int pimasize ;
+
+ if (psf->file.mode != SFM_WRITE)
+ return SFE_BAD_MODE_RW ;
+
+ samplesperblock = 2 * (blockalign - 4 * psf->sf.channels) / psf->sf.channels + 1 ;
+
+ pimasize = sizeof (IMA_ADPCM_PRIVATE) + blockalign + 3 * psf->sf.channels * samplesperblock ;
+
+ if ((pima = calloc (1, pimasize)) == NULL)
+ return SFE_MALLOC_FAILED ;
+
+ psf->codec_data = (void*) pima ;
+
+ pima->channels = psf->sf.channels ;
+ pima->blocksize = blockalign ;
+ pima->samplesperblock = samplesperblock ;
+
+ pima->block = (unsigned char*) pima->data ;
+ pima->samples = (short*) (pima->data + blockalign) ;
+
+ pima->samplecount = 0 ;
+
+ switch (SF_CONTAINER (psf->sf.format))
+ { case SF_FORMAT_WAV :
+ case SF_FORMAT_W64 :
+ pima->encode_block = wav_w64_ima_encode_block ;
+ break ;
+
+ case SF_FORMAT_AIFF :
+ pima->encode_block = aiff_ima_encode_block ;
+ break ;
+
+ default :
+ psf_log_printf (psf, "ima_reader_init: bad psf->sf.format\n") ;
+ return SFE_INTERNAL ;
+ } ;
+
+ psf->write_short = ima_write_s ;
+ psf->write_int = ima_write_i ;
+ psf->write_float = ima_write_f ;
+ psf->write_double = ima_write_d ;
+
+ return 0 ;
+} /* ima_writer_init */
+
+/*==========================================================================================
+*/
+
+static int
+ima_write_block (SF_PRIVATE *psf, IMA_ADPCM_PRIVATE *pima, const short *ptr, int len)
+{ int count, total = 0, indx = 0 ;
+
+ while (indx < len)
+ { count = (pima->samplesperblock - pima->samplecount) * pima->channels ;
+
+ if (count > len - indx)
+ count = len - indx ;
+
+ memcpy (&(pima->samples [pima->samplecount * pima->channels]), &(ptr [total]), count * sizeof (short)) ;
+ indx += count ;
+ pima->samplecount += count / pima->channels ;
+ total = indx ;
+
+ if (pima->samplecount >= pima->samplesperblock)
+ pima->encode_block (psf, pima) ;
+ } ;
+
+ return total ;
+} /* ima_write_block */
+
+static sf_count_t
+ima_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len)
+{ IMA_ADPCM_PRIVATE *pima ;
+ int writecount, count ;
+ sf_count_t total = 0 ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
+
+ while (len)
+ { writecount = (len > 0x10000000) ? 0x10000000 : (int) len ;
+
+ count = ima_write_block (psf, pima, ptr, writecount) ;
+
+ total += count ;
+ len -= count ;
+ if (count != writecount)
+ break ;
+ } ;
+
+ return total ;
+} /* ima_write_s */
+
+static sf_count_t
+ima_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len)
+{ IMA_ADPCM_PRIVATE *pima ;
+ short *sptr ;
+ int k, bufferlen, writecount, count ;
+ sf_count_t total = 0 ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
+
+ sptr = psf->u.sbuf ;
+ bufferlen = ARRAY_LEN (psf->u.sbuf) ;
+ while (len > 0)
+ { writecount = (len >= bufferlen) ? bufferlen : (int) len ;
+ for (k = 0 ; k < writecount ; k++)
+ sptr [k] = ptr [total + k] >> 16 ;
+ count = ima_write_block (psf, pima, sptr, writecount) ;
+ total += count ;
+ len -= writecount ;
+ if (count != writecount)
+ break ;
+ } ;
+
+ return total ;
+} /* ima_write_i */
+
+static sf_count_t
+ima_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len)
+{ IMA_ADPCM_PRIVATE *pima ;
+ short *sptr ;
+ int k, bufferlen, writecount, count ;
+ sf_count_t total = 0 ;
+ float normfact ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
+
+ normfact = (psf->norm_float == SF_TRUE) ? (1.0 * 0x7FFF) : 1.0 ;
+
+ sptr = psf->u.sbuf ;
+ bufferlen = ARRAY_LEN (psf->u.sbuf) ;
+ while (len > 0)
+ { writecount = (len >= bufferlen) ? bufferlen : (int) len ;
+ for (k = 0 ; k < writecount ; k++)
+ sptr [k] = lrintf (normfact * ptr [total + k]) ;
+ count = ima_write_block (psf, pima, sptr, writecount) ;
+ total += count ;
+ len -= writecount ;
+ if (count != writecount)
+ break ;
+ } ;
+
+ return total ;
+} /* ima_write_f */
+
+static sf_count_t
+ima_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len)
+{ IMA_ADPCM_PRIVATE *pima ;
+ short *sptr ;
+ int k, bufferlen, writecount, count ;
+ sf_count_t total = 0 ;
+ double normfact ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pima = (IMA_ADPCM_PRIVATE*) psf->codec_data ;
+
+ normfact = (psf->norm_double == SF_TRUE) ? (1.0 * 0x7FFF) : 1.0 ;
+
+ sptr = psf->u.sbuf ;
+ bufferlen = ARRAY_LEN (psf->u.sbuf) ;
+ while (len > 0)
+ { writecount = (len >= bufferlen) ? bufferlen : (int) len ;
+ for (k = 0 ; k < writecount ; k++)
+ sptr [k] = lrint (normfact * ptr [total + k]) ;
+ count = ima_write_block (psf, pima, sptr, writecount) ;
+ total += count ;
+ len -= writecount ;
+ if (count != writecount)
+ break ;
+ } ;
+
+ return total ;
+} /* ima_write_d */
+
projects / Faustine.git / blobdiff