tools/rbspeex/rbspeex.c

   1 /**************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  *
   9  * Copyright (C) 2007 Thom Johansen
  10  *
  11  * All files in this archive are subject to the GNU General Public License.
  12  * See the file COPYING in the source tree root for full license agreement.
  13  *
  14  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  15  * KIND, either express or implied.
  16  *
  17  ***************************************************************************/
  18
  19 #include <speex/speex.h>
  20 #include <speex/speex_resampler.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25
  26 #include "rbspeex.h"
  27
  28 /* Read an unaligned 32-bit little endian long from buffer. */
  29 unsigned int get_long_le(unsigned char *p)
  30 {
  31     return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
  32 }
  33
  34 void put_ushort_le(unsigned short x, unsigned char *out)
  35 {
  36     out[0] = x & 0xff;
  37     out[1] = x >> 8;
  38 }
  39
  40 void put_uint_le(unsigned int x, unsigned char *out)
  41 {
  42     out[0] = x & 0xff;
  43     out[1] = (x >> 8) & 0xff;
  44     out[2] = (x >> 16) & 0xff;
  45     out[3] = x >> 24;
  46 }
  47
  48
  49
  50 bool get_wave_metadata(FILE *fd, int *numchan, int *bps, int *sr, int *numsamples)
  51 {
  52     unsigned char buf[1024];
  53     unsigned long totalsamples = 0;
  54     unsigned long channels = 0;
  55     unsigned long bitspersample = 0;
  56     unsigned long numbytes = 0;
  57     size_t read_bytes;
  58     int i;
  59
  60     if ((read_bytes = fread(buf, 1, 12, fd)) < 12)
  61         return false;
  62
  63     if ((memcmp(buf, "RIFF",4) != 0) || (memcmp(&buf[8], "WAVE", 4) != 0))
  64         return false;
  65
  66     /* iterate over WAVE chunks until 'data' chunk */
  67     while (1) {
  68         /* get chunk header */
  69         if ((read_bytes = fread(buf, 1, 8, fd)) < 8)
  70             return false;
  71
  72         /* chunkSize */
  73         i = get_long_le(&buf[4]);
  74
  75         if (memcmp(buf, "fmt ", 4) == 0) {
  76             /* get rest of chunk */
  77             if ((read_bytes = fread(buf, 1, 16, fd)) < 16)
  78                 return false;
  79
  80             i -= 16;
  81
  82             channels = *numchan = buf[2] | (buf[3] << 8);
  83             *sr = get_long_le(&buf[4]);
  84             /* wBitsPerSample */
  85             bitspersample = *bps = buf[14] | (buf[15] << 8);
  86         } else if (memcmp(buf, "data", 4) == 0) {
  87             numbytes = i;
  88             break;
  89         } else if (memcmp(buf, "fact", 4) == 0) {
  90             /* dwSampleLength */
  91             if (i >= 4) {
  92                 /* get rest of chunk */
  93                 if ((read_bytes = fread(buf, 1, 4, fd)) < 4)
  94                     return false;
  95
  96                 i -= 4;
  97                 totalsamples = get_long_le(buf);
  98             }
  99         }
 100
 101         /* seek to next chunk (even chunk sizes must be padded) */
 102         if (i & 0x01)
 103             i++;
 104
 105         if (fseek(fd, i, SEEK_CUR) < 0)
 106             return false;
 107     }
 108
 109     if ((numbytes == 0) || (channels == 0))
 110         return false;
 111
 112     if (totalsamples == 0) {
 113         /* for PCM only */
 114         totalsamples = numbytes/((((bitspersample - 1) / 8) + 1)*channels);
 115     }
 116     *numsamples = totalsamples;
 117     return true;
 118 }
 119
 120 /* We'll eat an entire WAV file here, and encode it with Speex, packing the
 121  * bits as tightly as we can. Output is completely raw, with absolutely
 122  * nothing to identify the contents. Files are left open, so remember to close
 123  * them.
 124  */
 125 bool encode_file(FILE *fin, FILE *fout, float quality, int complexity,
 126                  bool narrowband, float volume, char *errstr, size_t errlen)
 127 {
 128     spx_int16_t *in = NULL, *inpos;
 129     spx_int16_t enc_buf[640]; /* Max frame size */
 130     char cbits[200];
 131     void *st = NULL;
 132     SpeexResamplerState *resampler = NULL;
 133     SpeexBits bits;
 134     int i, tmp, target_sr, numchan, bps, sr, numsamples, frame_size, lookahead;
 135     int nbytes;
 136     bool ret = true;
 137
 138     if (!get_wave_metadata(fin, &numchan, &bps, &sr, &numsamples)) {
 139         snprintf(errstr, errlen, "invalid WAV file");
 140         return false;
 141     }
 142     if (numchan != 1) {
 143         snprintf(errstr, errlen, "input file must be mono");
 144         return false;
 145     }
 146     if (bps != 16) {
 147         snprintf(errstr, errlen, "samples must be 16 bit");
 148         return false;
 149     }
 150
 151     /* Allocate an encoder of specified type, defaults to wideband */
 152     st = speex_encoder_init(narrowband ? &speex_nb_mode : &speex_wb_mode);
 153     if (narrowband)
 154         target_sr = 8000;
 155     else
 156         target_sr = 16000;
 157     speex_bits_init(&bits);
 158
 159     /* VBR */
 160     tmp = 1;
 161     speex_encoder_ctl(st, SPEEX_SET_VBR, &tmp);
 162     /* Quality, 0-10 */
 163     speex_encoder_ctl(st, SPEEX_SET_VBR_QUALITY, &quality);
 164     /* Complexity, 0-10 */
 165     speex_encoder_ctl(st, SPEEX_SET_COMPLEXITY, &complexity);
 166     speex_encoder_ctl(st, SPEEX_GET_FRAME_SIZE, &frame_size);
 167     speex_encoder_ctl(st, SPEEX_GET_LOOKAHEAD, &lookahead);
 168
 169     /* Read input samples into a buffer */
 170     in = calloc(numsamples + lookahead, sizeof(spx_int16_t));
 171     if (in == NULL) {
 172         snprintf(errstr, errlen, "could not allocate clip memory");
 173         ret = false;
 174         goto finish;
 175     }
 176     if (fread(in, 2, numsamples, fin) != numsamples) {
 177         snprintf(errstr, errlen, "could not read input file data");
 178         ret = false;
 179         goto finish;
 180    }
 181
 182     if (volume != 1.0f) {
 183         for (i = 0; i < numsamples; ++i)
 184             in[i] *= volume;
 185     }
 186
 187     if (sr != target_sr) {
 188         resampler = speex_resampler_init(1, sr, target_sr, 10, NULL);
 189         speex_resampler_skip_zeros(resampler);
 190     }
 191
 192     /* There will be 'lookahead' samples of zero at the end of the array, to
 193      * make sure the Speex encoder is allowed to spit out all its data at clip
 194      * end */
 195     numsamples += lookahead;
 196
 197     inpos = in;
 198     while (numsamples > 0) {
 199         int samples = frame_size;
 200
 201         /* Check if we need to resample */
 202         if (sr != target_sr) {
 203             spx_uint32_t in_len = numsamples, out_len = frame_size;
 204             double resample_factor = (double)sr/(double)target_sr;
 205             /* Calculate how many input samples are needed for one full frame
 206              * out, and add some, just in case. */
 207             spx_uint32_t samples_in = frame_size*resample_factor + 50;
 208
 209             /* Limit this or resampler will try to allocate it all on stack */
 210             if (in_len > samples_in)
 211                 in_len = samples_in;
 212             speex_resampler_process_int(resampler, 0, inpos, &in_len,
 213                                         enc_buf, &out_len);
 214             inpos += in_len;
 215             samples = out_len;
 216             numsamples -= in_len;
 217         } else {
 218             if (samples > numsamples)
 219                 samples = numsamples;
 220             memcpy(enc_buf, inpos, samples*2);
 221             inpos += frame_size;
 222             numsamples -= frame_size;
 223         }
 224         /* Pad out with zeros if we didn't fill all input */
 225         memset(enc_buf + samples, 0, (frame_size - samples)*2);
 226
 227         if (speex_encode_int(st, enc_buf, &bits) < 0) {
 228             snprintf(errstr, errlen, "encoder error");
 229             ret = false;
 230             goto finish;
 231         }
 232
 233         /* Copy the bits to an array of char that can be written */
 234         nbytes = speex_bits_write_whole_bytes(&bits, cbits, 200);
 235
 236         /* Write the compressed data */
 237         if (fwrite(cbits, 1, nbytes, fout) != nbytes) {
 238             snprintf(errstr, errlen, "could not write output data");
 239             ret = false;
 240             goto finish;
 241         }
 242     }
 243     /* Squeeze out the last bits */
 244     nbytes = speex_bits_write(&bits, cbits, 200);
 245     if (fwrite(cbits, 1, nbytes, fout) != nbytes) {
 246         snprintf(errstr, errlen, "could not write output data");
 247         ret = false;
 248     }
 249
 250 finish:
 251     if (st != NULL)
 252         speex_encoder_destroy(st);
 253     speex_bits_destroy(&bits);
 254     if (resampler != NULL)
 255         speex_resampler_destroy(resampler);
 256     if (in != NULL)
 257         free(in);
 258     return ret;
 259 }
 260
 261