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     QEMUFile *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 (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         qemu_put_buffer (wav->f, dst, convert_samples << hw->info.shift);
  80
  81         rpos = (rpos + convert_samples) % hw->samples;
  82         samples -= convert_samples;
  83         wav->total_samples += convert_samples;
  84     }
  85
  86     hw->rpos = rpos;
  87     return decr;
  88 }
  89
  90 static int wav_write_out (SWVoiceOut *sw, void *buf, int len)
  91 {
  92     return audio_pcm_sw_write (sw, buf, len);
  93 }
  94
  95 /* VICE code: Store number as little endian. */
  96 static void le_store (uint8_t *buf, uint32_t val, int len)
  97 {
  98     int i;
  99     for (i = 0; i < len; i++) {
 100         buf[i] = (uint8_t) (val & 0xff);
 101         val >>= 8;
 102     }
 103 }
 104
 105 static int wav_init_out (HWVoiceOut *hw, struct audsettings *as)
 106 {
 107     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
 108     int bits16 = 0, stereo = 0;
 109     uint8_t hdr[] = {
 110         0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
 111         0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
 112         0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
 113         0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
 114     };
 115     struct audsettings wav_as = conf.settings;
 116
 117     (void) as;
 118
 119     stereo = wav_as.nchannels == 2;
 120     switch (wav_as.fmt) {
 121     case AUD_FMT_S8:
 122     case AUD_FMT_U8:
 123         bits16 = 0;
 124         break;
 125
 126     case AUD_FMT_S16:
 127     case AUD_FMT_U16:
 128         bits16 = 1;
 129         break;
 130
 131     case AUD_FMT_S32:
 132     case AUD_FMT_U32:
 133         dolog ("WAVE files can not handle 32bit formats\n");
 134         return -1;
 135     }
 136
 137     hdr[34] = bits16 ? 0x10 : 0x08;
 138
 139     wav_as.endianness = 0;
 140     audio_pcm_init_info (&hw->info, &wav_as);
 141
 142     hw->samples = 1024;
 143     wav->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 144     if (!wav->pcm_buf) {
 145         dolog ("Could not allocate buffer (%d bytes)\n",
 146                hw->samples << hw->info.shift);
 147         return -1;
 148     }
 149
 150     le_store (hdr + 22, hw->info.nchannels, 2);
 151     le_store (hdr + 24, hw->info.freq, 4);
 152     le_store (hdr + 28, hw->info.freq << (bits16 + stereo), 4);
 153     le_store (hdr + 32, 1 << (bits16 + stereo), 2);
 154
 155     wav->f = qemu_fopen (conf.wav_path, "wb");
 156     if (!wav->f) {
 157         dolog ("Failed to open wave file `%s'\nReason: %s\n",
 158                conf.wav_path, strerror (errno));
 159         qemu_free (wav->pcm_buf);
 160         wav->pcm_buf = NULL;
 161         return -1;
 162     }
 163
 164     qemu_put_buffer (wav->f, hdr, sizeof (hdr));
 165     return 0;
 166 }
 167
 168 static void wav_fini_out (HWVoiceOut *hw)
 169 {
 170     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
 171     uint8_t rlen[4];
 172     uint8_t dlen[4];
 173     uint32_t datalen = wav->total_samples << hw->info.shift;
 174     uint32_t rifflen = datalen + 36;
 175
 176     if (!wav->f) {
 177         return;
 178     }
 179
 180     le_store (rlen, rifflen, 4);
 181     le_store (dlen, datalen, 4);
 182
 183     qemu_fseek (wav->f, 4, SEEK_SET);
 184     qemu_put_buffer (wav->f, rlen, 4);
 185
 186     qemu_fseek (wav->f, 32, SEEK_CUR);
 187     qemu_put_buffer (wav->f, dlen, 4);
 188
 189     qemu_fclose (wav->f);
 190     wav->f = NULL;
 191
 192     qemu_free (wav->pcm_buf);
 193     wav->pcm_buf = NULL;
 194 }
 195
 196 static int wav_ctl_out (HWVoiceOut *hw, int cmd, ...)
 197 {
 198     (void) hw;
 199     (void) cmd;
 200     return 0;
 201 }
 202
 203 static void *wav_audio_init (void)
 204 {
 205     return &conf;
 206 }
 207
 208 static void wav_audio_fini (void *opaque)
 209 {
 210     (void) opaque;
 211     ldebug ("wav_fini");
 212 }
 213
 214 static struct audio_option wav_options[] = {
 215     {
 216         .name  = "FREQUENCY",
 217         .tag   = AUD_OPT_INT,
 218         .valp  = &conf.settings.freq,
 219         .descr = "Frequency"
 220     },
 221     {
 222         .name  = "FORMAT",
 223         .tag   = AUD_OPT_FMT,
 224         .valp  = &conf.settings.fmt,
 225         .descr = "Format"
 226     },
 227     {
 228         .name  = "DAC_FIXED_CHANNELS",
 229         .tag   = AUD_OPT_INT,
 230         .valp  = &conf.settings.nchannels,
 231         .descr = "Number of channels (1 - mono, 2 - stereo)"
 232     },
 233     {
 234         .name  = "PATH",
 235         .tag   = AUD_OPT_STR,
 236         .valp  = &conf.wav_path,
 237         .descr = "Path to wave file"
 238     },
 239     { /* End of list */ }
 240 };
 241
 242 static struct audio_pcm_ops wav_pcm_ops = {
 243     .init_out = wav_init_out,
 244     .fini_out = wav_fini_out,
 245     .run_out  = wav_run_out,
 246     .write    = wav_write_out,
 247     .ctl_out  = wav_ctl_out,
 248 };
 249
 250 struct audio_driver wav_audio_driver = {
 251     .name           = "wav",
 252     .descr          = "WAV renderer http://wikipedia.org/wiki/WAV",
 253     .options        = wav_options,
 254     .init           = wav_audio_init,
 255     .fini           = wav_audio_fini,
 256     .pcm_ops        = &wav_pcm_ops,
 257     .can_be_default = 0,
 258     .max_voices_out = 1,
 259     .max_voices_in  = 0,
 260     .voice_size_out = sizeof (WAVVoiceOut),
 261     .voice_size_in  = 0
 262 };