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Annotation of qemu/audio/noaudio.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * QEMU NULL audio output driver
        !             3:  * 
        !             4:  * Copyright (c) 2004 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: #include "audio/audio_int.h"
        !            27: 
        !            28: typedef struct NoVoice {
        !            29:     HWVoice hw;
        !            30:     int64_t old_ticks;
        !            31: } NoVoice;
        !            32: 
        !            33: #define dolog(...) AUD_log ("noaudio", __VA_ARGS__)
        !            34: #ifdef DEBUG
        !            35: #define ldebug(...) dolog (__VA_ARGS__)
        !            36: #else
        !            37: #define ldebug(...)
        !            38: #endif
        !            39: 
        !            40: static void no_hw_run (HWVoice *hw)
        !            41: {
        !            42:     NoVoice *no = (NoVoice *) hw;
        !            43:     int rpos, live, decr, samples;
        !            44:     st_sample_t *src;
        !            45:     int64_t now = qemu_get_clock (vm_clock);
        !            46:     int64_t ticks = now - no->old_ticks;
        !            47:     int64_t bytes = (ticks * hw->bytes_per_second) / ticks_per_sec;
        !            48: 
        !            49:     if (bytes > INT_MAX)
        !            50:         samples = INT_MAX >> hw->shift;
        !            51:     else
        !            52:         samples = bytes >> hw->shift;
        !            53: 
        !            54:     live = pcm_hw_get_live (hw);
        !            55:     if (live <= 0)
        !            56:         return;
        !            57: 
        !            58:     no->old_ticks = now;
        !            59:     decr = audio_MIN (live, samples);
        !            60:     samples = decr;
        !            61:     rpos = hw->rpos;
        !            62:     while (samples) {
        !            63:         int left_till_end_samples = hw->samples - rpos;
        !            64:         int convert_samples = audio_MIN (samples, left_till_end_samples);
        !            65: 
        !            66:         src = advance (hw->mix_buf, rpos * sizeof (st_sample_t));
        !            67:         memset (src, 0, convert_samples * sizeof (st_sample_t));
        !            68: 
        !            69:         rpos = (rpos + convert_samples) % hw->samples;
        !            70:         samples -= convert_samples;
        !            71:     }
        !            72: 
        !            73:     pcm_hw_dec_live (hw, decr);
        !            74:     hw->rpos = rpos;
        !            75: }
        !            76: 
        !            77: static int no_hw_write (SWVoice *sw, void *buf, int len)
        !            78: {
        !            79:     return pcm_hw_write (sw, buf, len);
        !            80: }
        !            81: 
        !            82: static int no_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
        !            83: {
        !            84:     hw->freq = freq;
        !            85:     hw->nchannels = nchannels;
        !            86:     hw->fmt = fmt;
        !            87:     hw->bufsize = 4096;
        !            88:     return 0;
        !            89: }
        !            90: 
        !            91: static void no_hw_fini (HWVoice *hw)
        !            92: {
        !            93:     (void) hw;
        !            94: }
        !            95: 
        !            96: static int no_hw_ctl (HWVoice *hw, int cmd, ...)
        !            97: {
        !            98:     (void) hw;
        !            99:     (void) cmd;
        !           100:     return 0;
        !           101: }
        !           102: 
        !           103: static void *no_audio_init (void)
        !           104: {
        !           105:     return &no_audio_init;
        !           106: }
        !           107: 
        !           108: static void no_audio_fini (void *opaque)
        !           109: {
        !           110: }
        !           111: 
        !           112: struct pcm_ops no_pcm_ops = {
        !           113:     no_hw_init,
        !           114:     no_hw_fini,
        !           115:     no_hw_run,
        !           116:     no_hw_write,
        !           117:     no_hw_ctl
        !           118: };
        !           119: 
        !           120: struct audio_output_driver no_output_driver = {
        !           121:     "none",
        !           122:     no_audio_init,
        !           123:     no_audio_fini,
        !           124:     &no_pcm_ops,
        !           125:     1,
        !           126:     1,
        !           127:     sizeof (NoVoice)
        !           128: };

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