Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / audioconvert.c
1 /*
2 * audio conversion
3 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * audio conversion
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28 #include "libavutil/avstring.h"
29 #include "libavutil/common.h"
30 #include "libavutil/libm.h"
31 #include "libavutil/samplefmt.h"
32 #include "avcodec.h"
33 #include "audioconvert.h"
34
35 #if FF_API_AUDIO_CONVERT
36
37 struct AVAudioConvert {
38 int in_channels, out_channels;
39 int fmt_pair;
40 };
41
42 AVAudioConvert *av_audio_convert_alloc(enum AVSampleFormat out_fmt, int out_channels,
43 enum AVSampleFormat in_fmt, int in_channels,
44 const float *matrix, int flags)
45 {
46 AVAudioConvert *ctx;
47 if (in_channels!=out_channels)
48 return NULL; /* FIXME: not supported */
49 ctx = av_malloc(sizeof(AVAudioConvert));
50 if (!ctx)
51 return NULL;
52 ctx->in_channels = in_channels;
53 ctx->out_channels = out_channels;
54 ctx->fmt_pair = out_fmt + AV_SAMPLE_FMT_NB*in_fmt;
55 return ctx;
56 }
57
58 void av_audio_convert_free(AVAudioConvert *ctx)
59 {
60 av_free(ctx);
61 }
62
63 int av_audio_convert(AVAudioConvert *ctx,
64 void * const out[6], const int out_stride[6],
65 const void * const in[6], const int in_stride[6], int len)
66 {
67 int ch;
68
69 //FIXME optimize common cases
70
71 for(ch=0; ch<ctx->out_channels; ch++){
72 const int is= in_stride[ch];
73 const int os= out_stride[ch];
74 const uint8_t *pi= in[ch];
75 uint8_t *po= out[ch];
76 uint8_t *end= po + os*len;
77 if(!out[ch])
78 continue;
79
80 #define CONV(ofmt, otype, ifmt, expr)\
81 if(ctx->fmt_pair == ofmt + AV_SAMPLE_FMT_NB*ifmt){\
82 do{\
83 *(otype*)po = expr; pi += is; po += os;\
84 }while(po < end);\
85 }
86
87 //FIXME put things below under ifdefs so we do not waste space for cases no codec will need
88 //FIXME rounding ?
89
90 CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_U8 , *(const uint8_t*)pi)
91 else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<8)
92 else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<24)
93 else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
94 else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
95 else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80)
96 else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S16, *(const int16_t*)pi)
97 else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S16, *(const int16_t*)pi<<16)
98 else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15)))
99 else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15)))
100 else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80)
101 else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S32, *(const int32_t*)pi>>16)
102 else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S32, *(const int32_t*)pi)
103 else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1U<<31)))
104 else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1U<<31)))
105 else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_FLT, av_clip_uint8( lrintf(*(const float*)pi * (1<<7)) + 0x80))
106 else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, av_clip_int16( lrintf(*(const float*)pi * (1<<15))))
107 else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(const float*)pi * (1U<<31))))
108 else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_FLT, *(const float*)pi)
109 else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_FLT, *(const float*)pi)
110 else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_DBL, av_clip_uint8( lrint(*(const double*)pi * (1<<7)) + 0x80))
111 else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, av_clip_int16( lrint(*(const double*)pi * (1<<15))))
112 else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(const double*)pi * (1U<<31))))
113 else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_DBL, *(const double*)pi)
114 else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_DBL, *(const double*)pi)
115 else return -1;
116 }
117 return 0;
118 }
119
120 #endif /* FF_API_AUDIO_CONVERT */