audio/wavaudio.c

   1 /*
   2  * QEMU WAV audio driver
   3  *
   4  * Copyright (c) 2004-2005 Vassili Karpov (malc)
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "vl.h"
  25
  26 #define AUDIO_CAP "wav"
  27 #include "audio_int.h"
  28
  29 typedef struct WAVVoiceOut {
  30     HWVoiceOut hw;
  31     QEMUFile *f;
  32     int64_t old_ticks;
  33     void *pcm_buf;
  34     int total_samples;
  35 } WAVVoiceOut;
  36
  37 static struct {
  38     const char *wav_path;
  39 } conf = {
  40     .wav_path = "qemu.wav"
  41 };
  42
  43 static int wav_run_out (HWVoiceOut *hw)
  44 {
  45     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
  46     int rpos, live, decr, samples;
  47     uint8_t *dst;
  48     st_sample_t *src;
  49     int64_t now = qemu_get_clock (vm_clock);
  50     int64_t ticks = now - wav->old_ticks;
  51     int64_t bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec;
  52
  53     if (bytes > INT_MAX) {
  54         samples = INT_MAX >> hw->info.shift;
  55     }
  56     else {
  57         samples = bytes >> hw->info.shift;
  58     }
  59
  60     live = audio_pcm_hw_get_live_out (hw);
  61     if (!live) {
  62         return 0;
  63     }
  64
  65     wav->old_ticks = now;
  66     decr = audio_MIN (live, samples);
  67     samples = decr;
  68     rpos = hw->rpos;
  69     while (samples) {
  70         int left_till_end_samples = hw->samples - rpos;
  71         int convert_samples = audio_MIN (samples, left_till_end_samples);
  72
  73         src = hw->mix_buf + rpos;
  74         dst = advance (wav->pcm_buf, rpos << hw->info.shift);
  75
  76         hw->clip (dst, src, convert_samples);
  77         qemu_put_buffer (wav->f, dst, convert_samples << hw->info.shift);
  78         mixeng_clear (src, convert_samples);
  79
  80         rpos = (rpos + convert_samples) % hw->samples;
  81         samples -= convert_samples;
  82         wav->total_samples += convert_samples;
  83     }
  84
  85     hw->rpos = rpos;
  86     return decr;
  87 }
  88
  89 static int wav_write_out (SWVoiceOut *sw, void *buf, int len)
  90 {
  91     return audio_pcm_sw_write (sw, buf, len);
  92 }
  93
  94 /* VICE code: Store number as little endian. */
  95 static void le_store (uint8_t *buf, uint32_t val, int len)
  96 {
  97     int i;
  98     for (i = 0; i < len; i++) {
  99         buf[i] = (uint8_t) (val & 0xff);
 100         val >>= 8;
 101     }
 102 }
 103
 104 static int wav_init_out (HWVoiceOut *hw, int freq, int nchannels, audfmt_e fmt)
 105 {
 106     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
 107     int bits16;
 108     uint8_t hdr[] = {
 109         0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
 110         0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
 111         0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
 112         0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
 113     };
 114
 115     freq = audio_state.fixed_freq_out;
 116     fmt = audio_state.fixed_fmt_out;
 117     nchannels = audio_state.fixed_channels_out;
 118
 119     switch (fmt) {
 120     case AUD_FMT_S8:
 121     case AUD_FMT_U8:
 122         bits16 = 0;
 123         break;
 124
 125     case AUD_FMT_S16:
 126     case AUD_FMT_U16:
 127         bits16 = 1;
 128         break;
 129
 130     default:
 131         dolog ("Internal logic error bad format %d\n", fmt);
 132         return -1;
 133     }
 134
 135     hdr[34] = bits16 ? 0x10 : 0x08;
 136     audio_pcm_init_info (
 137         &hw->info,
 138         freq,
 139         nchannels,
 140         bits16 ? AUD_FMT_S16 : AUD_FMT_U8,
 141         audio_need_to_swap_endian (0)
 142         );
 143     hw->bufsize = 4096;
 144     wav->pcm_buf = qemu_mallocz (hw->bufsize);
 145     if (!wav->pcm_buf) {
 146         dolog ("Can not initialize WAV buffer of %d bytes\n",
 147                hw->bufsize);
 148         return -1;
 149     }
 150
 151     le_store (hdr + 22, hw->info.nchannels, 2);
 152     le_store (hdr + 24, hw->info.freq, 4);
 153     le_store (hdr + 28, hw->info.freq << (bits16 + (nchannels == 2)), 4);
 154     le_store (hdr + 32, 1 << (bits16 + (nchannels == 2)), 2);
 155
 156     wav->f = fopen (conf.wav_path, "wb");
 157     if (!wav->f) {
 158         dolog ("Failed to open wave file `%s'\nReason: %s\n",
 159                conf.wav_path, strerror (errno));
 160         qemu_free (wav->pcm_buf);
 161         wav->pcm_buf = NULL;
 162         return -1;
 163     }
 164
 165     qemu_put_buffer (wav->f, hdr, sizeof (hdr));
 166     return 0;
 167 }
 168
 169 static void wav_fini_out (HWVoiceOut *hw)
 170 {
 171     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
 172     int stereo = hw->info.nchannels == 2;
 173     uint8_t rlen[4];
 174     uint8_t dlen[4];
 175     uint32_t rifflen = (wav->total_samples << stereo) + 36;
 176     uint32_t datalen = wav->total_samples << stereo;
 177
 178     if (!wav->f || !hw->active) {
 179         return;
 180     }
 181
 182     le_store (rlen, rifflen, 4);
 183     le_store (dlen, datalen, 4);
 184
 185     qemu_fseek (wav->f, 4, SEEK_SET);
 186     qemu_put_buffer (wav->f, rlen, 4);
 187
 188     qemu_fseek (wav->f, 32, SEEK_CUR);
 189     qemu_put_buffer (wav->f, dlen, 4);
 190
 191     fclose (wav->f);
 192     wav->f = NULL;
 193
 194     qemu_free (wav->pcm_buf);
 195     wav->pcm_buf = NULL;
 196 }
 197
 198 static int wav_ctl_out (HWVoiceOut *hw, int cmd, ...)
 199 {
 200     (void) hw;
 201     (void) cmd;
 202     return 0;
 203 }
 204
 205 static void *wav_audio_init (void)
 206 {
 207     return &conf;
 208 }
 209
 210 static void wav_audio_fini (void *opaque)
 211 {
 212     (void) opaque;
 213     ldebug ("wav_fini");
 214 }
 215
 216 struct audio_option wav_options[] = {
 217     {"PATH", AUD_OPT_STR, &conf.wav_path,
 218      "Path to wave file", NULL, 0},
 219     {NULL, 0, NULL, NULL, NULL, 0}
 220 };
 221
 222 struct audio_pcm_ops wav_pcm_ops = {
 223     wav_init_out,
 224     wav_fini_out,
 225     wav_run_out,
 226     wav_write_out,
 227     wav_ctl_out,
 228
 229     NULL,
 230     NULL,
 231     NULL,
 232     NULL,
 233     NULL
 234 };
 235
 236 struct audio_driver wav_audio_driver = {
 237     INIT_FIELD (name           = ) "wav",
 238     INIT_FIELD (descr          = )
 239     "WAV renderer http://wikipedia.org/wiki/WAV",
 240     INIT_FIELD (options        = ) wav_options,
 241     INIT_FIELD (init           = ) wav_audio_init,
 242     INIT_FIELD (fini           = ) wav_audio_fini,
 243     INIT_FIELD (pcm_ops        = ) &wav_pcm_ops,
 244     INIT_FIELD (can_be_default = ) 0,
 245     INIT_FIELD (max_voices_out = ) 1,
 246     INIT_FIELD (max_voices_in  = ) 0,
 247     INIT_FIELD (voice_size_out = ) sizeof (WAVVoiceOut),
 248     INIT_FIELD (voice_size_in  = ) 0
 249 };