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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | * audio conversion |
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3 | * Copyright (c) 2006 Michael Niedermayer |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | /** |
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23 | * @file |
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24 | * audio conversion |
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25 | * @author Michael Niedermayer |
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26 | */ |
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27 | |||
28 | #include "libavutil/avstring.h" |
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29 | #include "libavutil/common.h" |
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30 | #include "libavutil/libm.h" |
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31 | #include "libavutil/samplefmt.h" |
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32 | #include "avcodec.h" |
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33 | #include "audioconvert.h" |
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34 | |||
35 | struct AVAudioConvert { |
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36 | int in_channels, out_channels; |
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37 | int fmt_pair; |
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38 | }; |
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39 | |||
40 | AVAudioConvert *av_audio_convert_alloc(enum AVSampleFormat out_fmt, int out_channels, |
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41 | enum AVSampleFormat in_fmt, int in_channels, |
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42 | const float *matrix, int flags) |
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43 | { |
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44 | AVAudioConvert *ctx; |
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45 | if (in_channels!=out_channels) |
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46 | return NULL; /* FIXME: not supported */ |
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47 | ctx = av_malloc(sizeof(AVAudioConvert)); |
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48 | if (!ctx) |
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49 | return NULL; |
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50 | ctx->in_channels = in_channels; |
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51 | ctx->out_channels = out_channels; |
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52 | ctx->fmt_pair = out_fmt + AV_SAMPLE_FMT_NB*in_fmt; |
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53 | return ctx; |
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54 | } |
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55 | |||
56 | void av_audio_convert_free(AVAudioConvert *ctx) |
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57 | { |
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58 | av_free(ctx); |
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59 | } |
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60 | |||
61 | int av_audio_convert(AVAudioConvert *ctx, |
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62 | void * const out[6], const int out_stride[6], |
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63 | const void * const in[6], const int in_stride[6], int len) |
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64 | { |
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65 | int ch; |
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66 | |||
67 | //FIXME optimize common cases |
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68 | |||
69 | for(ch=0; ch |
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70 | const int is= in_stride[ch]; |
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71 | const int os= out_stride[ch]; |
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72 | const uint8_t *pi= in[ch]; |
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73 | uint8_t *po= out[ch]; |
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74 | uint8_t *end= po + os*len; |
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75 | if(!out[ch]) |
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76 | continue; |
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77 | |||
78 | #define CONV(ofmt, otype, ifmt, expr)\ |
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79 | if(ctx->fmt_pair == ofmt + AV_SAMPLE_FMT_NB*ifmt){\ |
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80 | do{\ |
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81 | *(otype*)po = expr; pi += is; po += os;\ |
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82 | }while(po < end);\ |
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83 | } |
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84 | |||
85 | //FIXME put things below under ifdefs so we do not waste space for cases no codec will need |
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86 | //FIXME rounding ? |
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87 | |||
88 | CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_U8 , *(const uint8_t*)pi) |
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89 | else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<8) |
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90 | else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<24) |
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91 | else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7))) |
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92 | else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7))) |
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93 | else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80) |
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94 | else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S16, *(const int16_t*)pi) |
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95 | else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S16, *(const int16_t*)pi<<16) |
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96 | else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15))) |
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97 | else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15))) |
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98 | else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80) |
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99 | else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S32, *(const int32_t*)pi>>16) |
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100 | else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S32, *(const int32_t*)pi) |
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101 | else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1U<<31))) |
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102 | else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1U<<31))) |
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103 | else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_FLT, av_clip_uint8( lrintf(*(const float*)pi * (1<<7)) + 0x80)) |
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104 | else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, av_clip_int16( lrintf(*(const float*)pi * (1<<15)))) |
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105 | else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(const float*)pi * (1U<<31)))) |
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106 | else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_FLT, *(const float*)pi) |
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107 | else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_FLT, *(const float*)pi) |
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108 | else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_DBL, av_clip_uint8( lrint(*(const double*)pi * (1<<7)) + 0x80)) |
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109 | else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, av_clip_int16( lrint(*(const double*)pi * (1<<15)))) |
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110 | else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(const double*)pi * (1U<<31)))) |
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111 | else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_DBL, *(const double*)pi) |
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112 | else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_DBL, *(const double*)pi) |
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113 | else return -1; |
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114 | } |
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115 | return 0; |
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116 | }31)))) |