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Diffstat (limited to 'audio/mixeng.c')
| -rw-r--r-- | audio/mixeng.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/audio/mixeng.c b/audio/mixeng.c new file mode 100644 index 0000000..b0bb412 --- /dev/null +++ b/audio/mixeng.c @@ -0,0 +1,255 @@ +/* + * QEMU Mixing engine + * + * Copyright (c) 2004 Vassili Karpov (malc) + * Copyright (c) 1998 Fabrice Bellard + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ +#include "vl.h" +//#define DEBUG_FP +#include "audio/mixeng.h" + +#define IN_T int8_t +#define IN_MIN CHAR_MIN +#define IN_MAX CHAR_MAX +#define SIGNED +#include "mixeng_template.h" +#undef SIGNED +#undef IN_MAX +#undef IN_MIN +#undef IN_T + +#define IN_T uint8_t +#define IN_MIN 0 +#define IN_MAX UCHAR_MAX +#include "mixeng_template.h" +#undef IN_MAX +#undef IN_MIN +#undef IN_T + +#define IN_T int16_t +#define IN_MIN SHRT_MIN +#define IN_MAX SHRT_MAX +#define SIGNED +#include "mixeng_template.h" +#undef SIGNED +#undef IN_MAX +#undef IN_MIN +#undef IN_T + +#define IN_T uint16_t +#define IN_MIN 0 +#define IN_MAX USHRT_MAX +#include "mixeng_template.h" +#undef IN_MAX +#undef IN_MIN +#undef IN_T + +t_sample *mixeng_conv[2][2][2] = { + { + { + conv_uint8_t_to_mono, + conv_uint16_t_to_mono + }, + { + conv_int8_t_to_mono, + conv_int16_t_to_mono + } + }, + { + { + conv_uint8_t_to_stereo, + conv_uint16_t_to_stereo + }, + { + conv_int8_t_to_stereo, + conv_int16_t_to_stereo + } + } +}; + +f_sample *mixeng_clip[2][2][2] = { + { + { + clip_uint8_t_from_mono, + clip_uint16_t_from_mono + }, + { + clip_int8_t_from_mono, + clip_int16_t_from_mono + } + }, + { + { + clip_uint8_t_from_stereo, + clip_uint16_t_from_stereo + }, + { + clip_int8_t_from_stereo, + clip_int16_t_from_stereo + } + } +}; + +/* + * August 21, 1998 + * Copyright 1998 Fabrice Bellard. + * + * [Rewrote completly the code of Lance Norskog And Sundry + * Contributors with a more efficient algorithm.] + * + * This source code is freely redistributable and may be used for + * any purpose. This copyright notice must be maintained. + * Lance Norskog And Sundry Contributors are not responsible for + * the consequences of using this software. + */ + +/* + * Sound Tools rate change effect file. + */ +/* + * Linear Interpolation. + * + * The use of fractional increment allows us to use no buffer. It + * avoid the problems at the end of the buffer we had with the old + * method which stored a possibly big buffer of size + * lcm(in_rate,out_rate). + * + * Limited to 16 bit samples and sampling frequency <= 65535 Hz. If + * the input & output frequencies are equal, a delay of one sample is + * introduced. Limited to processing 32-bit count worth of samples. + * + * 1 << FRAC_BITS evaluating to zero in several places. Changed with + * an (unsigned long) cast to make it safe. MarkMLl 2/1/99 + */ + +/* Private data */ +typedef struct ratestuff { + uint64_t opos; + uint64_t opos_inc; + uint32_t ipos; /* position in the input stream (integer) */ + st_sample_t ilast; /* last sample in the input stream */ +} *rate_t; + +/* + * Prepare processing. + */ +void *st_rate_start (int inrate, int outrate) +{ + rate_t rate = (rate_t) qemu_mallocz (sizeof (struct ratestuff)); + + if (!rate) { + exit (EXIT_FAILURE); + } + + if (inrate == outrate) { + // exit (EXIT_FAILURE); + } + + if (inrate >= 65535 || outrate >= 65535) { + // exit (EXIT_FAILURE); + } + + rate->opos = 0; + + /* increment */ + rate->opos_inc = (inrate * ((int64_t) UINT_MAX)) / outrate; + + rate->ipos = 0; + rate->ilast.l = 0; + rate->ilast.r = 0; + return rate; +} + +/* + * Processed signed long samples from ibuf to obuf. + * Return number of samples processed. + */ +void st_rate_flow (void *opaque, st_sample_t *ibuf, st_sample_t *obuf, + int *isamp, int *osamp) +{ + rate_t rate = (rate_t) opaque; + st_sample_t *istart, *iend; + st_sample_t *ostart, *oend; + st_sample_t ilast, icur, out; + int64_t t; + + ilast = rate->ilast; + + istart = ibuf; + iend = ibuf + *isamp; + + ostart = obuf; + oend = obuf + *osamp; + + if (rate->opos_inc == 1ULL << 32) { + int i, n = *isamp > *osamp ? *osamp : *isamp; + for (i = 0; i < n; i++) { + obuf[i].l += ibuf[i].r; + obuf[i].r += ibuf[i].r; + } + *isamp = n; + *osamp = n; + return; + } + + while (obuf < oend) { + + /* Safety catch to make sure we have input samples. */ + if (ibuf >= iend) + break; + + /* read as many input samples so that ipos > opos */ + + while (rate->ipos <= (rate->opos >> 32)) { + ilast = *ibuf++; + rate->ipos++; + /* See if we finished the input buffer yet */ + if (ibuf >= iend) goto the_end; + } + + icur = *ibuf; + + /* interpolate */ + t = rate->opos & 0xffffffff; + out.l = (ilast.l * (INT_MAX - t) + icur.l * t) / INT_MAX; + out.r = (ilast.r * (INT_MAX - t) + icur.r * t) / INT_MAX; + + /* output sample & increment position */ +#if 0 + *obuf++ = out; +#else + obuf->l += out.l; + obuf->r += out.r; + obuf += 1; +#endif + rate->opos += rate->opos_inc; + } + +the_end: + *isamp = ibuf - istart; + *osamp = obuf - ostart; + rate->ilast = ilast; +} + +void st_rate_stop (void *opaque) +{ + qemu_free (opaque); +} |