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163 lines
6.3 KiB
163 lines
6.3 KiB
/* |
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* audio conversion |
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* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* audio conversion |
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* @author Michael Niedermayer <michaelni@gmx.at> |
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*/ |
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#include "libavutil/avstring.h" |
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#include "libavutil/libm.h" |
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#include "libavutil/samplefmt.h" |
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#include "avcodec.h" |
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#include "audioconvert.h" |
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#if FF_API_OLD_SAMPLE_FMT |
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const char *avcodec_get_sample_fmt_name(int sample_fmt) |
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{ |
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return av_get_sample_fmt_name(sample_fmt); |
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} |
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enum AVSampleFormat avcodec_get_sample_fmt(const char* name) |
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{ |
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return av_get_sample_fmt(name); |
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} |
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void avcodec_sample_fmt_string (char *buf, int buf_size, int sample_fmt) |
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{ |
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av_get_sample_fmt_string(buf, buf_size, sample_fmt); |
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} |
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#endif |
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int64_t avcodec_guess_channel_layout(int nb_channels, enum CodecID codec_id, const char *fmt_name) |
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{ |
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switch(nb_channels) { |
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case 1: return AV_CH_LAYOUT_MONO; |
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case 2: return AV_CH_LAYOUT_STEREO; |
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case 3: return AV_CH_LAYOUT_SURROUND; |
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case 4: return AV_CH_LAYOUT_QUAD; |
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case 5: return AV_CH_LAYOUT_5POINT0; |
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case 6: return AV_CH_LAYOUT_5POINT1; |
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case 8: return AV_CH_LAYOUT_7POINT1; |
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default: return 0; |
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} |
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} |
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#if FF_API_OLD_AUDIOCONVERT |
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int64_t avcodec_get_channel_layout(const char *name) |
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{ |
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return av_get_channel_layout(name); |
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} |
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void avcodec_get_channel_layout_string(char *buf, int buf_size, int nb_channels, int64_t channel_layout) |
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{ |
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av_get_channel_layout_string(buf, buf_size, nb_channels, channel_layout); |
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} |
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int avcodec_channel_layout_num_channels(int64_t channel_layout) |
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{ |
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return av_get_channel_layout_nb_channels(channel_layout); |
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} |
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#endif |
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struct AVAudioConvert { |
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int in_channels, out_channels; |
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int fmt_pair; |
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}; |
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AVAudioConvert *av_audio_convert_alloc(enum AVSampleFormat out_fmt, int out_channels, |
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enum AVSampleFormat in_fmt, int in_channels, |
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const float *matrix, int flags) |
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{ |
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AVAudioConvert *ctx; |
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if (in_channels!=out_channels) |
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return NULL; /* FIXME: not supported */ |
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ctx = av_malloc(sizeof(AVAudioConvert)); |
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if (!ctx) |
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return NULL; |
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ctx->in_channels = in_channels; |
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ctx->out_channels = out_channels; |
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ctx->fmt_pair = out_fmt + AV_SAMPLE_FMT_NB*in_fmt; |
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return ctx; |
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} |
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void av_audio_convert_free(AVAudioConvert *ctx) |
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{ |
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av_free(ctx); |
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} |
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int av_audio_convert(AVAudioConvert *ctx, |
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void * const out[6], const int out_stride[6], |
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const void * const in[6], const int in_stride[6], int len) |
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{ |
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int ch; |
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//FIXME optimize common cases |
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for(ch=0; ch<ctx->out_channels; ch++){ |
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const int is= in_stride[ch]; |
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const int os= out_stride[ch]; |
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const uint8_t *pi= in[ch]; |
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uint8_t *po= out[ch]; |
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uint8_t *end= po + os*len; |
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if(!out[ch]) |
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continue; |
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#define CONV(ofmt, otype, ifmt, expr)\ |
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if(ctx->fmt_pair == ofmt + AV_SAMPLE_FMT_NB*ifmt){\ |
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do{\ |
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*(otype*)po = expr; pi += is; po += os;\ |
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}while(po < end);\ |
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} |
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//FIXME put things below under ifdefs so we do not waste space for cases no codec will need |
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//FIXME rounding ? |
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CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_U8 , *(const uint8_t*)pi) |
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else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<8) |
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else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<24) |
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else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7))) |
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else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7))) |
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else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80) |
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else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S16, *(const int16_t*)pi) |
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else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S16, *(const int16_t*)pi<<16) |
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else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15))) |
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else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15))) |
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else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80) |
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else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S32, *(const int32_t*)pi>>16) |
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else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S32, *(const int32_t*)pi) |
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else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1<<31))) |
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else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1<<31))) |
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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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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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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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else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_FLT, *(const float*)pi) |
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else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_FLT, *(const float*)pi) |
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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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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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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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else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_DBL, *(const double*)pi) |
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else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_DBL, *(const double*)pi) |
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else return -1; |
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} |
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return 0; |
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}
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