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     },
  46     "qemu.wav"
  47 };
  48
  49 static int wav_run_out (HWVoiceOut *hw)
  50 {
  51     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
  52     int rpos, live, decr, samples;
  53     uint8_t *dst;
  54     st_sample_t *src;
  55     int64_t now = qemu_get_clock (vm_clock);
  56     int64_t ticks = now - wav->old_ticks;
  57     int64_t bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec;
  58
  59     if (bytes > INT_MAX) {
  60         samples = INT_MAX >> hw->info.shift;
  61     }
  62     else {
  63         samples = bytes >> hw->info.shift;
  64     }
  65
  66     live = audio_pcm_hw_get_live_out (hw);
  67     if (!live) {
  68         return 0;
  69     }
  70
  71     wav->old_ticks = now;
  72     decr = audio_MIN (live, samples);
  73     samples = decr;
  74     rpos = hw->rpos;
  75     while (samples) {
  76         int left_till_end_samples = hw->samples - rpos;
  77         int convert_samples = audio_MIN (samples, left_till_end_samples);
  78
  79         src = hw->mix_buf + rpos;
  80         dst = advance (wav->pcm_buf, rpos << hw->info.shift);
  81
  82         hw->clip (dst, src, convert_samples);
  83         qemu_put_buffer (wav->f, dst, convert_samples << hw->info.shift);
  84         mixeng_clear (src, convert_samples);
  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
 137     hdr[34] = bits16 ? 0x10 : 0x08;
 138
 139     audio_pcm_init_info (&hw->info, &wav_as, audio_need_to_swap_endian (0));
 140
 141     hw->samples = 1024;
 142     wav->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 143     if (!wav->pcm_buf) {
 144         dolog ("Could not allocate buffer (%d bytes)\n",
 145                hw->samples << hw->info.shift);
 146         return -1;
 147     }
 148
 149     le_store (hdr + 22, hw->info.nchannels, 2);
 150     le_store (hdr + 24, hw->info.freq, 4);
 151     le_store (hdr + 28, hw->info.freq << (bits16 + stereo), 4);
 152     le_store (hdr + 32, 1 << (bits16 + stereo), 2);
 153
 154     wav->f = fopen (conf.wav_path, "wb");
 155     if (!wav->f) {
 156         dolog ("Failed to open wave file `%s'\nReason: %s\n",
 157                conf.wav_path, strerror (errno));
 158         qemu_free (wav->pcm_buf);
 159         wav->pcm_buf = NULL;
 160         return -1;
 161     }
 162
 163     qemu_put_buffer (wav->f, hdr, sizeof (hdr));
 164     return 0;
 165 }
 166
 167 static void wav_fini_out (HWVoiceOut *hw)
 168 {
 169     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
 170     uint8_t rlen[4];
 171     uint8_t dlen[4];
 172     uint32_t datalen = wav->total_samples << hw->info.shift;
 173     uint32_t rifflen = datalen + 36;
 174
 175     if (!wav->f) {
 176         return;
 177     }
 178
 179     le_store (rlen, rifflen, 4);
 180     le_store (dlen, datalen, 4);
 181
 182     qemu_fseek (wav->f, 4, SEEK_SET);
 183     qemu_put_buffer (wav->f, rlen, 4);
 184
 185     qemu_fseek (wav->f, 32, SEEK_CUR);
 186     qemu_put_buffer (wav->f, dlen, 4);
 187
 188     fclose (wav->f);
 189     wav->f = NULL;
 190
 191     qemu_free (wav->pcm_buf);
 192     wav->pcm_buf = NULL;
 193 }
 194
 195 static int wav_ctl_out (HWVoiceOut *hw, int cmd, ...)
 196 {
 197     (void) hw;
 198     (void) cmd;
 199     return 0;
 200 }
 201
 202 static void *wav_audio_init (void)
 203 {
 204     return &conf;
 205 }
 206
 207 static void wav_audio_fini (void *opaque)
 208 {
 209     (void) opaque;
 210     ldebug ("wav_fini");
 211 }
 212
 213 struct audio_option wav_options[] = {
 214     {"FREQUENCY", AUD_OPT_INT, &conf.settings.freq,
 215      "Frequency", NULL, 0},
 216
 217     {"FORMAT", AUD_OPT_FMT, &conf.settings.fmt,
 218      "Format", NULL, 0},
 219
 220     {"DAC_FIXED_CHANNELS", AUD_OPT_INT, &conf.settings.nchannels,
 221      "Number of channels (1 - mono, 2 - stereo)", NULL, 0},
 222
 223     {"PATH", AUD_OPT_STR, &conf.wav_path,
 224      "Path to wave file", NULL, 0},
 225     {NULL, 0, NULL, NULL, NULL, 0}
 226 };
 227
 228 struct audio_pcm_ops wav_pcm_ops = {
 229     wav_init_out,
 230     wav_fini_out,
 231     wav_run_out,
 232     wav_write_out,
 233     wav_ctl_out,
 234
 235     NULL,
 236     NULL,
 237     NULL,
 238     NULL,
 239     NULL
 240 };
 241
 242 struct audio_driver wav_audio_driver = {
 243     INIT_FIELD (name           = ) "wav",
 244     INIT_FIELD (descr          = )
 245     "WAV renderer http://wikipedia.org/wiki/WAV",
 246     INIT_FIELD (options        = ) wav_options,
 247     INIT_FIELD (init           = ) wav_audio_init,
 248     INIT_FIELD (fini           = ) wav_audio_fini,
 249     INIT_FIELD (pcm_ops        = ) &wav_pcm_ops,
 250     INIT_FIELD (can_be_default = ) 0,
 251     INIT_FIELD (max_voices_out = ) 1,
 252     INIT_FIELD (max_voices_in  = ) 0,
 253     INIT_FIELD (voice_size_out = ) sizeof (WAVVoiceOut),
 254     INIT_FIELD (voice_size_in  = ) 0
 255 };