| 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 */ |