56d351c50eef29719228f1155ac4fb31318a8e6e
[libav.git] / libavcodec / audioconvert.c
1 /*
2 * audio conversation
3 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 */
20
21 /**
22 * @file audioconvert.c
23 * audio conversation
24 * @author Michael Niedermayer <michaelni@gmx.at>
25 */
26
27 #include "avcodec.h"
28
29 int av_audio_convert(void *maybe_dspcontext_or_something_av_convert_specific,
30 void *out[6], int out_stride[6], enum SampleFormat out_fmt,
31 void * in[6], int in_stride[6], enum SampleFormat in_fmt, int len){
32 int ch;
33 const int isize= FFMIN( in_fmt+1, 4);
34 const int osize= FFMIN(out_fmt+1, 4);
35 const int fmt_pair= out_fmt + 5*in_fmt;
36
37 //FIXME optimize common cases
38
39 for(ch=0; ch<6; ch++){
40 const int is= in_stride[ch] * isize;
41 const int os= out_stride[ch] * osize;
42 uint8_t *pi= in[ch];
43 uint8_t *po= out[ch];
44 uint8_t *end= po + os;
45 if(!out[ch])
46 continue;
47
48 #define CONV(ofmt, otype, ifmt, expr)\
49 if(fmt_pair == ofmt + 5*ifmt){\
50 do{\
51 *(otype*)po = expr; pi += is; po += os;\
52 }while(po < end);\
53 }
54
55 //FIXME put things below under ifdefs so we dont waste space for cases no codec will need
56 //FIXME rounding and cliping ?
57
58 CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_U8 , *(uint8_t*)pi)
59 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)<<8)
60 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)<<24)
61 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
62 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S16, (*(int16_t*)pi>>8) + 0x80)
63 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S16, *(int16_t*)pi)
64 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S16, *(int16_t*)pi<<16)
65 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S16, *(int16_t*)pi*(1.0 / (1<<15)))
66 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S32, (*(int32_t*)pi>>24) + 0x80)
67 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S32, *(int32_t*)pi>>16)
68 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S32, *(int32_t*)pi)
69 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S32, *(int32_t*)pi*(1.0 / (1<<31)))
70 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<7)) + 0x80)
71 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<15)))
72 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<31)))
73 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_FLT, *(float*)pi)
74 else return -1;
75 }
76 return 0;
77 }