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