plugins/audio/Speex/libspeex/speex_callbacks.c

   1 /* Copyright (C) 2002 Jean-Marc Valin
   2    File speex_callbacks.c
   3    Callback handling and in-band signalling
   4
   5
   6    Redistribution and use in source and binary forms, with or without
   7    modification, are permitted provided that the following conditions
   8    are met:
   9
  10    - Redistributions of source code must retain the above copyright
  11    notice, this list of conditions and the following disclaimer.
  12
  13    - Redistributions in binary form must reproduce the above copyright
  14    notice, this list of conditions and the following disclaimer in the
  15    documentation and/or other materials provided with the distribution.
  16
  17    - Neither the name of the Xiph.org Foundation nor the names of its
  18    contributors may be used to endorse or promote products derived from
  19    this software without specific prior written permission.
  20
  21    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  25    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  26    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  27    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  28    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32
  33 */
  34
  35 #include "speex_callbacks.h"
  36 #include "misc.h"
  37
  38 int speex_inband_handler(SpeexBits *bits, SpeexCallback *callback_list, void *state)
  39 {
  40    int id;
  41    SpeexCallback *callback;
  42    /*speex_bits_advance(bits, 5);*/
  43    id=speex_bits_unpack_unsigned(bits, 4);
  44    callback = callback_list+id;
  45
  46    if (callback->func)
  47    {
  48       return callback->func(bits, state, callback->data);
  49    } else
  50       /*If callback is not registered, skip the right number of bits*/
  51    {
  52       int adv;
  53       if (id<2)
  54          adv = 1;
  55       else if (id<8)
  56          adv = 4;
  57       else if (id<10)
  58          adv = 8;
  59       else if (id<12)
  60          adv = 16;
  61       else if (id<14)
  62          adv = 32;
  63       else
  64          adv = 64;
  65       speex_bits_advance(bits, adv);
  66    }
  67    return 0;
  68 }
  69
  70 int speex_std_mode_request_handler(SpeexBits *bits, void *state, void *data)
  71 {
  72    int m;
  73    m = speex_bits_unpack_unsigned(bits, 4);
  74    speex_encoder_ctl(data, SPEEX_SET_MODE, &m);
  75    return 0;
  76 }
  77
  78 int speex_std_low_mode_request_handler(SpeexBits *bits, void *state, void *data)
  79 {
  80    int m;
  81    m = speex_bits_unpack_unsigned(bits, 4);
  82    speex_encoder_ctl(data, SPEEX_SET_LOW_MODE, &m);
  83    return 0;
  84 }
  85
  86 int speex_std_high_mode_request_handler(SpeexBits *bits, void *state, void *data)
  87 {
  88    int m;
  89    m = speex_bits_unpack_unsigned(bits, 4);
  90    speex_encoder_ctl(data, SPEEX_SET_HIGH_MODE, &m);
  91    return 0;
  92 }
  93
  94 int speex_std_vbr_request_handler(SpeexBits *bits, void *state, void *data)
  95 {
  96    int vbr;
  97    vbr = speex_bits_unpack_unsigned(bits, 1);
  98    speex_encoder_ctl(data, SPEEX_SET_VBR, &vbr);
  99    return 0;
 100 }
 101
 102 int speex_std_enh_request_handler(SpeexBits *bits, void *state, void *data)
 103 {
 104    int enh;
 105    enh = speex_bits_unpack_unsigned(bits, 1);
 106    speex_decoder_ctl(data, SPEEX_SET_ENH, &enh);
 107    return 0;
 108 }
 109
 110 int speex_std_vbr_quality_request_handler(SpeexBits *bits, void *state, void *data)
 111 {
 112    int qual;
 113    qual = speex_bits_unpack_unsigned(bits, 4);
 114    speex_encoder_ctl(data, SPEEX_SET_VBR_QUALITY, &qual);
 115    return 0;
 116 }
 117
 118
 119 int speex_std_char_handler(SpeexBits *bits, void *state, void *data)
 120 {
 121    unsigned char ch;
 122    ch = speex_bits_unpack_unsigned(bits, 8);
 123    _speex_putc(ch, data);
 124    return 0;
 125 }
 126
 127
 128
 129 /* Default handler for user callbacks: skip it */
 130 int speex_default_user_handler(SpeexBits *bits, void *state, void *data)
 131 {
 132    int req_size = speex_bits_unpack_unsigned(bits, 4);
 133    speex_bits_advance(bits, 5+8*req_size);
 134    return 0;
 135 }