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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 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 | } |