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https://git.ffmpeg.org/ffmpeg.git
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82cee279a5
Originally committed as revision 14496 to svn://svn.ffmpeg.org/ffmpeg/trunk
146 lines
5.0 KiB
C
146 lines
5.0 KiB
C
/*
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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 audioconvert.c
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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 "avcodec.h"
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#include "audioconvert.h"
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typedef struct SampleFmtInfo {
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const char *name;
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int bits;
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} SampleFmtInfo;
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/** this table gives more information about formats */
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static const SampleFmtInfo sample_fmt_info[SAMPLE_FMT_NB] = {
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[SAMPLE_FMT_U8] = { .name = "u8", .bits = 8 },
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[SAMPLE_FMT_S16] = { .name = "s16", .bits = 16 },
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[SAMPLE_FMT_S24] = { .name = "s24", .bits = 24 },
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[SAMPLE_FMT_S32] = { .name = "s32", .bits = 32 },
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[SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32 }
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};
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const char *avcodec_get_sample_fmt_name(int sample_fmt)
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{
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if (sample_fmt < 0 || sample_fmt >= SAMPLE_FMT_NB)
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return NULL;
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return sample_fmt_info[sample_fmt].name;
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}
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enum SampleFormat avcodec_get_sample_fmt(const char* name)
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{
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int i;
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for (i=0; i < SAMPLE_FMT_NB; i++)
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if (!strcmp(sample_fmt_info[i].name, name))
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return i;
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return SAMPLE_FMT_NONE;
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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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/* print header */
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if (sample_fmt < 0)
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snprintf (buf, buf_size, "name " " depth");
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else if (sample_fmt < SAMPLE_FMT_NB) {
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SampleFmtInfo info= sample_fmt_info[sample_fmt];
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snprintf (buf, buf_size, "%-6s" " %2d ", info.name, info.bits);
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}
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}
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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 SampleFormat out_fmt, int out_channels,
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enum SampleFormat in_fmt, int in_channels,
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const 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 + 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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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 + 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 and clipping ?
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CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_U8 , *(uint8_t*)pi)
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else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)<<8)
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else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)<<24)
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else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_U8 , (*(uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
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else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S16, (*(int16_t*)pi>>8) + 0x80)
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else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S16, *(int16_t*)pi)
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else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S16, *(int16_t*)pi<<16)
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else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S16, *(int16_t*)pi*(1.0 / (1<<15)))
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else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S32, (*(int32_t*)pi>>24) + 0x80)
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else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S32, *(int32_t*)pi>>16)
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else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S32, *(int32_t*)pi)
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else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S32, *(int32_t*)pi*(1.0 / (1<<31)))
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else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<7)) + 0x80)
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else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<15)))
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else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_FLT, lrintf(*(float*)pi * (1<<31)))
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else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_FLT, *(float*)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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