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)
  50 {
  51     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
  52     int rpos, live, 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 = (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
  85         rpos = (rpos + convert_samples) % hw->samples;
  86         samples -= convert_samples;
  87         wav->total_samples += convert_samples;
  88     }
  89
  90     hw->rpos = rpos;
  91     return decr;
  92 }
  93
  94 static int wav_write_out (SWVoiceOut *sw, void *buf, int len)
  95 {
  96     return audio_pcm_sw_write (sw, buf, len);
  97 }
  98
  99 /* VICE code: Store number as little endian. */
 100 static void le_store (uint8_t *buf, uint32_t val, int len)
 101 {
 102     int i;
 103     for (i = 0; i < len; i++) {
 104         buf[i] = (uint8_t) (val & 0xff);
 105         val >>= 8;
 106     }
 107 }
 108
 109 static int wav_init_out (HWVoiceOut *hw, struct audsettings *as)
 110 {
 111     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
 112     int bits16 = 0, stereo = 0;
 113     uint8_t hdr[] = {
 114         0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
 115         0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
 116         0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
 117         0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
 118     };
 119     struct audsettings wav_as = conf.settings;
 120
 121     (void) as;
 122
 123     stereo = wav_as.nchannels == 2;
 124     switch (wav_as.fmt) {
 125     case AUD_FMT_S8:
 126     case AUD_FMT_U8:
 127         bits16 = 0;
 128         break;
 129
 130     case AUD_FMT_S16:
 131     case AUD_FMT_U16:
 132         bits16 = 1;
 133         break;
 134
 135     case AUD_FMT_S32:
 136     case AUD_FMT_U32:
 137         dolog ("WAVE files can not handle 32bit formats\n");
 138         return -1;
 139     }
 140
 141     hdr[34] = bits16 ? 0x10 : 0x08;
 142
 143     wav_as.endianness = 0;
 144     audio_pcm_init_info (&hw->info, &wav_as);
 145
 146     hw->samples = 1024;
 147     wav->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 148     if (!wav->pcm_buf) {
 149         dolog ("Could not allocate buffer (%d bytes)\n",
 150                hw->samples << hw->info.shift);
 151         return -1;
 152     }
 153
 154     le_store (hdr + 22, hw->info.nchannels, 2);
 155     le_store (hdr + 24, hw->info.freq, 4);
 156     le_store (hdr + 28, hw->info.freq << (bits16 + stereo), 4);
 157     le_store (hdr + 32, 1 << (bits16 + stereo), 2);
 158
 159     wav->f = qemu_fopen (conf.wav_path, "wb");
 160     if (!wav->f) {
 161         dolog ("Failed to open wave file `%s'\nReason: %s\n",
 162                conf.wav_path, strerror (errno));
 163         qemu_free (wav->pcm_buf);
 164         wav->pcm_buf = NULL;
 165         return -1;
 166     }
 167
 168     qemu_put_buffer (wav->f, hdr, sizeof (hdr));
 169     return 0;
 170 }
 171
 172 static void wav_fini_out (HWVoiceOut *hw)
 173 {
 174     WAVVoiceOut *wav = (WAVVoiceOut *) hw;
 175     uint8_t rlen[4];
 176     uint8_t dlen[4];
 177     uint32_t datalen = wav->total_samples << hw->info.shift;
 178     uint32_t rifflen = datalen + 36;
 179
 180     if (!wav->f) {
 181         return;
 182     }
 183
 184     le_store (rlen, rifflen, 4);
 185     le_store (dlen, datalen, 4);
 186
 187     qemu_fseek (wav->f, 4, SEEK_SET);
 188     qemu_put_buffer (wav->f, rlen, 4);
 189
 190     qemu_fseek (wav->f, 32, SEEK_CUR);
 191     qemu_put_buffer (wav->f, dlen, 4);
 192
 193     qemu_fclose (wav->f);
 194     wav->f = NULL;
 195
 196     qemu_free (wav->pcm_buf);
 197     wav->pcm_buf = NULL;
 198 }
 199
 200 static int wav_ctl_out (HWVoiceOut *hw, int cmd, ...)
 201 {
 202     (void) hw;
 203     (void) cmd;
 204     return 0;
 205 }
 206
 207 static void *wav_audio_init (void)
 208 {
 209     return &conf;
 210 }
 211
 212 static void wav_audio_fini (void *opaque)
 213 {
 214     (void) opaque;
 215     ldebug ("wav_fini");
 216 }
 217
 218 static struct audio_option wav_options[] = {
 219     {
 220         .name  = "FREQUENCY",
 221         .tag   = AUD_OPT_INT,
 222         .valp  = &conf.settings.freq,
 223         .descr = "Frequency"
 224     },
 225     {
 226         .name  = "FORMAT",
 227         .tag   = AUD_OPT_FMT,
 228         .valp  = &conf.settings.fmt,
 229         .descr = "Format"
 230     },
 231     {
 232         .name  = "DAC_FIXED_CHANNELS",
 233         .tag   = AUD_OPT_INT,
 234         .valp  = &conf.settings.nchannels,
 235         .descr = "Number of channels (1 - mono, 2 - stereo)"
 236     },
 237     {
 238         .name  = "PATH",
 239         .tag   = AUD_OPT_STR,
 240         .valp  = &conf.wav_path,
 241         .descr = "Path to wave file"
 242     },
 243     { /* End of list */ }
 244 };
 245
 246 static struct audio_pcm_ops wav_pcm_ops = {
 247     .init_out = wav_init_out,
 248     .fini_out = wav_fini_out,
 249     .run_out  = wav_run_out,
 250     .write    = wav_write_out,
 251     .ctl_out  = wav_ctl_out,
 252 };
 253
 254 struct audio_driver wav_audio_driver = {
 255     .name           = "wav",
 256     .descr          = "WAV renderer http://wikipedia.org/wiki/WAV",
 257     .options        = wav_options,
 258     .init           = wav_audio_init,
 259     .fini           = wav_audio_fini,
 260     .pcm_ops        = &wav_pcm_ops,
 261     .can_be_default = 0,
 262     .max_voices_out = 1,
 263     .max_voices_in  = 0,
 264     .voice_size_out = sizeof (WAVVoiceOut),
 265     .voice_size_in  = 0
 266 };