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     {
  44         44100,
  45         2,
  46         AUD_FMT_S16,
  47         0
  48     },
  49     "qemu.wav"
  50 };
  51
  52 static int wav_run_out (HWVoiceOut *hw)
  53 {
  54     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
  55     int rpos, live, decr, samples;
  56     uint8_t *dst;
  57     struct st_sample *src;
  58     int64_t now = qemu_get_clock (vm_clock);
  59     int64_t ticks = now - wav->old_ticks;
  60     int64_t bytes = (ticks * hw->info.bytes_per_second) / ticks_per_sec;
  61
  62     if (bytes > INT_MAX) {
  63         samples = INT_MAX >> hw->info.shift;
  64     }
  65     else {
  66         samples = bytes >> hw->info.shift;
  67     }
  68
  69     live = audio_pcm_hw_get_live_out (hw);
  70     if (!live) {
  71         return 0;
  72     }
  73
  74     wav->old_ticks = now;
  75     decr = audio_MIN (live, samples);
  76     samples = decr;
  77     rpos = hw->rpos;
  78     while (samples) {
  79         int left_till_end_samples = hw->samples - rpos;
  80         int convert_samples = audio_MIN (samples, left_till_end_samples);
  81
  82         src = hw->mix_buf + rpos;
  83         dst = advance (wav->pcm_buf, rpos << hw->info.shift);
  84
  85         hw->clip (dst, src, convert_samples);
  86         qemu_put_buffer (wav->f, dst, convert_samples << hw->info.shift);
  87
  88         rpos = (rpos + convert_samples) % hw->samples;
  89         samples -= convert_samples;
  90         wav->total_samples += convert_samples;
  91     }
  92
  93     hw->rpos = rpos;
  94     return decr;
  95 }
  96
  97 static int wav_write_out (SWVoiceOut *sw, void *buf, int len)
  98 {
  99     return audio_pcm_sw_write (sw, buf, len);
 100 }
 101
 102 /* VICE code: Store number as little endian. */
 103 static void le_store (uint8_t *buf, uint32_t val, int len)
 104 {
 105     int i;
 106     for (i = 0; i < len; i++) {
 107         buf[i] = (uint8_t) (val & 0xff);
 108         val >>= 8;
 109     }
 110 }
 111
 112 static int wav_init_out (HWVoiceOut *hw, struct audsettings *as)
 113 {
 114     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
 115     int bits16 = 0, stereo = 0;
 116     uint8_t hdr[] = {
 117         0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
 118         0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
 119         0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
 120         0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
 121     };
 122     struct audsettings wav_as = conf.settings;
 123
 124     (void) as;
 125
 126     stereo = wav_as.nchannels == 2;
 127     switch (wav_as.fmt) {
 128     case AUD_FMT_S8:
 129     case AUD_FMT_U8:
 130         bits16 = 0;
 131         break;
 132
 133     case AUD_FMT_S16:
 134     case AUD_FMT_U16:
 135         bits16 = 1;
 136         break;
 137
 138     case AUD_FMT_S32:
 139     case AUD_FMT_U32:
 140         dolog ("WAVE files can not handle 32bit formats\n");
 141         return -1;
 142     }
 143
 144     hdr[34] = bits16 ? 0x10 : 0x08;
 145
 146     wav_as.endianness = 0;
 147     audio_pcm_init_info (&hw->info, &wav_as);
 148
 149     hw->samples = 1024;
 150     wav->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 151     if (!wav->pcm_buf) {
 152         dolog ("Could not allocate buffer (%d bytes)\n",
 153                hw->samples << hw->info.shift);
 154         return -1;
 155     }
 156
 157     le_store (hdr + 22, hw->info.nchannels, 2);
 158     le_store (hdr + 24, hw->info.freq, 4);
 159     le_store (hdr + 28, hw->info.freq << (bits16 + stereo), 4);
 160     le_store (hdr + 32, 1 << (bits16 + stereo), 2);
 161
 162     wav->f = qemu_fopen (conf.wav_path, "wb");
 163     if (!wav->f) {
 164         dolog ("Failed to open wave file `%s'\nReason: %s\n",
 165                conf.wav_path, strerror (errno));
 166         qemu_free (wav->pcm_buf);
 167         wav->pcm_buf = NULL;
 168         return -1;
 169     }
 170
 171     qemu_put_buffer (wav->f, hdr, sizeof (hdr));
 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     qemu_fseek (wav->f, 4, SEEK_SET);
 191     qemu_put_buffer (wav->f, rlen, 4);
 192
 193     qemu_fseek (wav->f, 32, SEEK_CUR);
 194     qemu_put_buffer (wav->f, dlen, 4);
 195
 196     qemu_fclose (wav->f);
 197     wav->f = NULL;
 198
 199     qemu_free (wav->pcm_buf);
 200     wav->pcm_buf = NULL;
 201 }
 202
 203 static int wav_ctl_out (HWVoiceOut *hw, int cmd, ...)
 204 {
 205     (void) hw;
 206     (void) cmd;
 207     return 0;
 208 }
 209
 210 static void *wav_audio_init (void)
 211 {
 212     return &conf;
 213 }
 214
 215 static void wav_audio_fini (void *opaque)
 216 {
 217     (void) opaque;
 218     ldebug ("wav_fini");
 219 }
 220
 221 static struct audio_option wav_options[] = {
 222     {"FREQUENCY", AUD_OPT_INT, &conf.settings.freq,
 223      "Frequency", NULL, 0},
 224
 225     {"FORMAT", AUD_OPT_FMT, &conf.settings.fmt,
 226      "Format", NULL, 0},
 227
 228     {"DAC_FIXED_CHANNELS", AUD_OPT_INT, &conf.settings.nchannels,
 229      "Number of channels (1 - mono, 2 - stereo)", NULL, 0},
 230
 231     {"PATH", AUD_OPT_STR, &conf.wav_path,
 232      "Path to wave file", NULL, 0},
 233     {NULL, 0, NULL, NULL, NULL, 0}
 234 };
 235
 236 static struct audio_pcm_ops wav_pcm_ops = {
 237     wav_init_out,
 238     wav_fini_out,
 239     wav_run_out,
 240     wav_write_out,
 241     wav_ctl_out,
 242
 243     NULL,
 244     NULL,
 245     NULL,
 246     NULL,
 247     NULL
 248 };
 249
 250 struct audio_driver wav_audio_driver = {
 251     INIT_FIELD (name           = ) "wav",
 252     INIT_FIELD (descr          = )
 253     "WAV renderer http://wikipedia.org/wiki/WAV",
 254     INIT_FIELD (options        = ) wav_options,
 255     INIT_FIELD (init           = ) wav_audio_init,
 256     INIT_FIELD (fini           = ) wav_audio_fini,
 257     INIT_FIELD (pcm_ops        = ) &wav_pcm_ops,
 258     INIT_FIELD (can_be_default = ) 0,
 259     INIT_FIELD (max_voices_out = ) 1,
 260     INIT_FIELD (max_voices_in  = ) 0,
 261     INIT_FIELD (voice_size_out = ) sizeof (WAVVoiceOut),
 262     INIT_FIELD (voice_size_in  = ) 0
 263 };