3 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
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.
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.
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
25 * @author Michael Niedermayer <michaelni@gmx.at>
28 #include "libavutil/avstring.h"
29 #include "libavutil/libm.h"
30 #include "libavutil/samplefmt.h"
32 #include "audioconvert.h"
34 #if FF_API_OLD_SAMPLE_FMT
35 const char *avcodec_get_sample_fmt_name(int sample_fmt)
37 return av_get_sample_fmt_name(sample_fmt);
40 enum AVSampleFormat avcodec_get_sample_fmt(const char* name)
42 return av_get_sample_fmt(name);
45 void avcodec_sample_fmt_string (char *buf, int buf_size, int sample_fmt)
47 av_get_sample_fmt_string(buf, buf_size, sample_fmt);
51 int64_t avcodec_guess_channel_layout(int nb_channels, enum CodecID codec_id, const char *fmt_name)
54 case 1: return AV_CH_LAYOUT_MONO;
55 case 2: return AV_CH_LAYOUT_STEREO;
56 case 3: return AV_CH_LAYOUT_SURROUND;
57 case 4: return AV_CH_LAYOUT_QUAD;
58 case 5: return AV_CH_LAYOUT_5POINT0;
59 case 6: return AV_CH_LAYOUT_5POINT1;
60 case 8: return AV_CH_LAYOUT_7POINT1;
65 #if FF_API_OLD_AUDIOCONVERT
66 int64_t avcodec_get_channel_layout(const char *name)
68 return av_get_channel_layout(name);
71 void avcodec_get_channel_layout_string(char *buf, int buf_size, int nb_channels, int64_t channel_layout)
73 av_get_channel_layout_string(buf, buf_size, nb_channels, channel_layout);
76 int avcodec_channel_layout_num_channels(int64_t channel_layout)
78 return av_get_channel_layout_nb_channels(channel_layout);
82 struct AVAudioConvert {
83 int in_channels, out_channels;
87 AVAudioConvert *av_audio_convert_alloc(enum AVSampleFormat out_fmt, int out_channels,
88 enum AVSampleFormat in_fmt, int in_channels,
89 const float *matrix, int flags)
92 if (in_channels!=out_channels)
93 return NULL; /* FIXME: not supported */
94 ctx = av_malloc(sizeof(AVAudioConvert));
97 ctx->in_channels = in_channels;
98 ctx->out_channels = out_channels;
99 ctx->fmt_pair = out_fmt + AV_SAMPLE_FMT_NB*in_fmt;
103 void av_audio_convert_free(AVAudioConvert *ctx)
108 int av_audio_convert(AVAudioConvert *ctx,
109 void * const out[6], const int out_stride[6],
110 const void * const in[6], const int in_stride[6], int len)
114 //FIXME optimize common cases
116 for(ch=0; ch<ctx->out_channels; ch++){
117 const int is= in_stride[ch];
118 const int os= out_stride[ch];
119 const uint8_t *pi= in[ch];
120 uint8_t *po= out[ch];
121 uint8_t *end= po + os*len;
125 #define CONV(ofmt, otype, ifmt, expr)\
126 if(ctx->fmt_pair == ofmt + AV_SAMPLE_FMT_NB*ifmt){\
128 *(otype*)po = expr; pi += is; po += os;\
132 //FIXME put things below under ifdefs so we do not waste space for cases no codec will need
135 CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_U8 , *(const uint8_t*)pi)
136 else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<8)
137 else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<24)
138 else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
139 else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
140 else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80)
141 else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S16, *(const int16_t*)pi)
142 else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S16, *(const int16_t*)pi<<16)
143 else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15)))
144 else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15)))
145 else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80)
146 else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_S32, *(const int32_t*)pi>>16)
147 else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_S32, *(const int32_t*)pi)
148 else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1<<31)))
149 else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1<<31)))
150 else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_FLT, av_clip_uint8( lrintf(*(const float*)pi * (1<<7)) + 0x80))
151 else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, av_clip_int16( lrintf(*(const float*)pi * (1<<15))))
152 else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(const float*)pi * (1U<<31))))
153 else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_FLT, *(const float*)pi)
154 else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_FLT, *(const float*)pi)
155 else CONV(AV_SAMPLE_FMT_U8 , uint8_t, AV_SAMPLE_FMT_DBL, av_clip_uint8( lrint(*(const double*)pi * (1<<7)) + 0x80))
156 else CONV(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, av_clip_int16( lrint(*(const double*)pi * (1<<15))))
157 else CONV(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(const double*)pi * (1U<<31))))
158 else CONV(AV_SAMPLE_FMT_FLT, float , AV_SAMPLE_FMT_DBL, *(const double*)pi)
159 else CONV(AV_SAMPLE_FMT_DBL, double , AV_SAMPLE_FMT_DBL, *(const double*)pi)