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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 */ |