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 "hw/hw.h"
  25 #include "qemu/timer.h"
  26 #include "audio.h"
  27
  28 #define AUDIO_CAP "wav"
  29 #include "audio_int.h"
  30
  31 typedef struct WAVVoiceOut {
  32     HWVoiceOut hw;
  33     FILE *f;
  34     int64_t old_ticks;
  35     void *pcm_buf;
  36     int total_samples;
  37 } WAVVoiceOut;
  38
  39 static struct {
  40     struct audsettings settings;
  41     const char *wav_path;
  42 } conf = {
  43     .settings.freq      = 44100,
  44     .settings.nchannels = 2,
  45     .settings.fmt       = AUD_FMT_S16,
  46     .wav_path           = "qemu.wav"
  47 };
  48
  49 static int wav_run_out (HWVoiceOut *hw, int live)
  50 {
  51     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
  52     int rpos, decr, samples;
  53     uint8_t *dst;
  54     struct st_sample *src;
  55     int64_t now = qemu_get_clock_ns (vm_clock);
  56     int64_t ticks = now - wav->old_ticks;
  57     int64_t bytes =
  58         muldiv64 (ticks, hw->info.bytes_per_second, get_ticks_per_sec ());
  59
  60     if (bytes > INT_MAX) {
  61         samples = INT_MAX >> hw->info.shift;
  62     }
  63     else {
  64         samples = bytes >> hw->info.shift;
  65     }
  66
  67     wav->old_ticks = now;
  68     decr = audio_MIN (live, samples);
  69     samples = decr;
  70     rpos = hw->rpos;
  71     while (samples) {
  72         int left_till_end_samples = hw->samples - rpos;
  73         int convert_samples = audio_MIN (samples, left_till_end_samples);
  74
  75         src = hw->mix_buf + rpos;
  76         dst = advance (wav->pcm_buf, rpos << hw->info.shift);
  77
  78         hw->clip (dst, src, convert_samples);
  79         if (fwrite (dst, convert_samples << hw->info.shift, 1, wav->f) != 1) {
  80             dolog ("wav_run_out: fwrite of %d bytes failed\nReaons: %s\n",
  81                    convert_samples << hw->info.shift, strerror (errno));
  82         }
  83
  84         rpos = (rpos + convert_samples) % hw->samples;
  85         samples -= convert_samples;
  86         wav->total_samples += convert_samples;
  87     }
  88
  89     hw->rpos = rpos;
  90     return decr;
  91 }
  92
  93 static int wav_write_out (SWVoiceOut *sw, void *buf, int len)
  94 {
  95     return audio_pcm_sw_write (sw, buf, len);
  96 }
  97
  98 /* VICE code: Store number as little endian. */
  99 static void le_store (uint8_t *buf, uint32_t val, int len)
 100 {
 101     int i;
 102     for (i = 0; i < len; i++) {
 103         buf[i] = (uint8_t) (val & 0xff);
 104         val >>= 8;
 105     }
 106 }
 107
 108 static int wav_init_out (HWVoiceOut *hw, struct audsettings *as)
 109 {
 110     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
 111     int bits16 = 0, stereo = 0;
 112     uint8_t hdr[] = {
 113         0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
 114         0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
 115         0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
 116         0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
 117     };
 118     struct audsettings wav_as = conf.settings;
 119
 120     (void) as;
 121
 122     stereo = wav_as.nchannels == 2;
 123     switch (wav_as.fmt) {
 124     case AUD_FMT_S8:
 125     case AUD_FMT_U8:
 126         bits16 = 0;
 127         break;
 128
 129     case AUD_FMT_S16:
 130     case AUD_FMT_U16:
 131         bits16 = 1;
 132         break;
 133
 134     case AUD_FMT_S32:
 135     case AUD_FMT_U32:
 136         dolog ("WAVE files can not handle 32bit formats\n");
 137         return -1;
 138     }
 139
 140     hdr[34] = bits16 ? 0x10 : 0x08;
 141
 142     wav_as.endianness = 0;
 143     audio_pcm_init_info (&hw->info, &wav_as);
 144
 145     hw->samples = 1024;
 146     wav->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 147     if (!wav->pcm_buf) {
 148         dolog ("Could not allocate buffer (%d bytes)\n",
 149                hw->samples << hw->info.shift);
 150         return -1;
 151     }
 152
 153     le_store (hdr + 22, hw->info.nchannels, 2);
 154     le_store (hdr + 24, hw->info.freq, 4);
 155     le_store (hdr + 28, hw->info.freq << (bits16 + stereo), 4);
 156     le_store (hdr + 32, 1 << (bits16 + stereo), 2);
 157
 158     wav->f = fopen (conf.wav_path, "wb");
 159     if (!wav->f) {
 160         dolog ("Failed to open wave file `%s'\nReason: %s\n",
 161                conf.wav_path, strerror (errno));
 162         g_free (wav->pcm_buf);
 163         wav->pcm_buf = NULL;
 164         return -1;
 165     }
 166
 167     if (fwrite (hdr, sizeof (hdr), 1, wav->f) != 1) {
 168         dolog ("wav_init_out: failed to write header\nReason: %s\n",
 169                strerror(errno));
 170         return -1;
 171     }
 172     return 0;
 173 }
 174
 175 static void wav_fini_out (HWVoiceOut *hw)
 176 {
 177     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
 178     uint8_t rlen[4];
 179     uint8_t dlen[4];
 180     uint32_t datalen = wav->total_samples << hw->info.shift;
 181     uint32_t rifflen = datalen + 36;
 182
 183     if (!wav->f) {
 184         return;
 185     }
 186
 187     le_store (rlen, rifflen, 4);
 188     le_store (dlen, datalen, 4);
 189
 190     if (fseek (wav->f, 4, SEEK_SET)) {
 191         dolog ("wav_fini_out: fseek to rlen failed\nReason: %s\n",
 192                strerror(errno));
 193         goto doclose;
 194     }
 195     if (fwrite (rlen, 4, 1, wav->f) != 1) {
 196         dolog ("wav_fini_out: failed to write rlen\nReason: %s\n",
 197                strerror (errno));
 198         goto doclose;
 199     }
 200     if (fseek (wav->f, 32, SEEK_CUR)) {
 201         dolog ("wav_fini_out: fseek to dlen failed\nReason: %s\n",
 202                strerror (errno));
 203         goto doclose;
 204     }
 205     if (fwrite (dlen, 4, 1, wav->f) != 1) {
 206         dolog ("wav_fini_out: failed to write dlen\nReaons: %s\n",
 207                strerror (errno));
 208         goto doclose;
 209     }
 210
 211  doclose:
 212     if (fclose (wav->f))  {
 213         dolog ("wav_fini_out: fclose %p failed\nReason: %s\n",
 214                wav->f, strerror (errno));
 215     }
 216     wav->f = NULL;
 217
 218     g_free (wav->pcm_buf);
 219     wav->pcm_buf = NULL;
 220 }
 221
 222 static int wav_ctl_out (HWVoiceOut *hw, int cmd, ...)
 223 {
 224     (void) hw;
 225     (void) cmd;
 226     return 0;
 227 }
 228
 229 static void *wav_audio_init (void)
 230 {
 231     return &conf;
 232 }
 233
 234 static void wav_audio_fini (void *opaque)
 235 {
 236     (void) opaque;
 237     ldebug ("wav_fini");
 238 }
 239
 240 static struct audio_option wav_options[] = {
 241     {
 242         .name  = "FREQUENCY",
 243         .tag   = AUD_OPT_INT,
 244         .valp  = &conf.settings.freq,
 245         .descr = "Frequency"
 246     },
 247     {
 248         .name  = "FORMAT",
 249         .tag   = AUD_OPT_FMT,
 250         .valp  = &conf.settings.fmt,
 251         .descr = "Format"
 252     },
 253     {
 254         .name  = "DAC_FIXED_CHANNELS",
 255         .tag   = AUD_OPT_INT,
 256         .valp  = &conf.settings.nchannels,
 257         .descr = "Number of channels (1 - mono, 2 - stereo)"
 258     },
 259     {
 260         .name  = "PATH",
 261         .tag   = AUD_OPT_STR,
 262         .valp  = &conf.wav_path,
 263         .descr = "Path to wave file"
 264     },
 265     { /* End of list */ }
 266 };
 267
 268 static struct audio_pcm_ops wav_pcm_ops = {
 269     .init_out = wav_init_out,
 270     .fini_out = wav_fini_out,
 271     .run_out  = wav_run_out,
 272     .write    = wav_write_out,
 273     .ctl_out  = wav_ctl_out,
 274 };
 275
 276 struct audio_driver wav_audio_driver = {
 277     .name           = "wav",
 278     .descr          = "WAV renderer http://wikipedia.org/wiki/WAV",
 279     .options        = wav_options,
 280     .init           = wav_audio_init,
 281     .fini           = wav_audio_fini,
 282     .pcm_ops        = &wav_pcm_ops,
 283     .can_be_default = 0,
 284     .max_voices_out = 1,
 285     .max_voices_in  = 0,
 286     .voice_size_out = sizeof (WAVVoiceOut),
 287     .voice_size_in  = 0
 288 };