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https://github.com/FFmpeg/FFmpeg.git
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243 lines
8.6 KiB
C
243 lines
8.6 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 libavcodec/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 "libavutil/avstring.h"
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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_S32] = { .name = "s32", .bits = 32 },
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[SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32 },
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[SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64 },
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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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static const char* const channel_names[]={
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"FL", "FR", "FC", "LFE", "BL", "BR", "FLC", "FRC",
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"BC", "SL", "SR", "TC", "TFL", "TFC", "TFR", "TBL",
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"TBC", "TBR",
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[29] = "DL",
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[30] = "DR",
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};
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static const char *get_channel_name(int channel_id)
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{
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if (channel_id<0 || channel_id>=FF_ARRAY_ELEMS(channel_names))
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return NULL;
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return channel_names[channel_id];
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}
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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 CH_LAYOUT_MONO;
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case 2: return CH_LAYOUT_STEREO;
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case 3: return CH_LAYOUT_SURROUND;
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case 4: return CH_LAYOUT_QUAD;
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case 5: return CH_LAYOUT_5POINT0;
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case 6: return CH_LAYOUT_5POINT1;
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case 8: return CH_LAYOUT_7POINT1;
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default: return 0;
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}
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}
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static const struct {
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const char *name;
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int nb_channels;
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int64_t layout;
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} channel_layout_map[] = {
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{ "mono", 1, CH_LAYOUT_MONO },
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{ "stereo", 2, CH_LAYOUT_STEREO },
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{ "4.0", 4, CH_LAYOUT_4POINT0 },
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{ "quad", 4, CH_LAYOUT_QUAD },
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{ "5.0", 5, CH_LAYOUT_5POINT0 },
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{ "5.0", 5, CH_LAYOUT_5POINT0_BACK },
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{ "5.1", 6, CH_LAYOUT_5POINT1 },
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{ "5.1", 6, CH_LAYOUT_5POINT1_BACK },
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{ "5.1+downmix", 8, CH_LAYOUT_5POINT1|CH_LAYOUT_STEREO_DOWNMIX, },
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{ "7.1", 8, CH_LAYOUT_7POINT1 },
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{ "7.1(wide)", 8, CH_LAYOUT_7POINT1_WIDE },
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{ "7.1+downmix", 10, CH_LAYOUT_7POINT1|CH_LAYOUT_STEREO_DOWNMIX, },
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{ 0 }
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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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int i;
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for (i=0; channel_layout_map[i].name; i++)
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if (nb_channels == channel_layout_map[i].nb_channels &&
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channel_layout == channel_layout_map[i].layout) {
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av_strlcpy(buf, channel_layout_map[i].name, buf_size);
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return;
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}
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snprintf(buf, buf_size, "%d channels", nb_channels);
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if (channel_layout) {
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int i,ch;
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av_strlcat(buf, " (", buf_size);
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for(i=0,ch=0; i<64; i++) {
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if ((channel_layout & (1L<<i))) {
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const char *name = get_channel_name(i);
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if (name) {
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if (ch>0) av_strlcat(buf, "|", buf_size);
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av_strlcat(buf, name, buf_size);
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}
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ch++;
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}
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}
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av_strlcat(buf, ")", buf_size);
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}
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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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int count;
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uint64_t x = channel_layout;
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for (count = 0; x; count++)
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x &= x-1; // unset lowest set bit
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return count;
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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 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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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 + 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 , *(const uint8_t*)pi)
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else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<8)
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else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<24)
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else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
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else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
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else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80)
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else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S16, *(const int16_t*)pi)
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else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S16, *(const int16_t*)pi<<16)
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else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15)))
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else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15)))
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else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80)
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else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S32, *(const int32_t*)pi>>16)
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else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S32, *(const int32_t*)pi)
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else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1<<31)))
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else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1<<31)))
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else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_FLT, lrintf(*(const float*)pi * (1<<7)) + 0x80)
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else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_FLT, lrintf(*(const float*)pi * (1<<15)))
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else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_FLT, lrintf(*(const float*)pi * (1<<31)))
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else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_FLT, *(const float*)pi)
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else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_FLT, *(const float*)pi)
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else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_DBL, lrint(*(const double*)pi * (1<<7)) + 0x80)
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else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_DBL, lrint(*(const double*)pi * (1<<15)))
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else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_DBL, lrint(*(const double*)pi * (1<<31)))
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else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_DBL, *(const double*)pi)
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else CONV(SAMPLE_FMT_DBL, double , 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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