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 "libavcore/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 SampleFormat 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 static const char* const channel_names[]={
52 "FL", "FR", "FC", "LFE", "BL", "BR", "FLC", "FRC",
53 "BC", "SL", "SR", "TC", "TFL", "TFC", "TFR", "TBL",
59 static const char *get_channel_name(int channel_id)
61 if (channel_id<0 || channel_id>=FF_ARRAY_ELEMS(channel_names))
63 return channel_names[channel_id];
66 int64_t avcodec_guess_channel_layout(int nb_channels, enum CodecID codec_id, const char *fmt_name)
69 case 1: return CH_LAYOUT_MONO;
70 case 2: return CH_LAYOUT_STEREO;
71 case 3: return CH_LAYOUT_SURROUND;
72 case 4: return CH_LAYOUT_QUAD;
73 case 5: return CH_LAYOUT_5POINT0;
74 case 6: return CH_LAYOUT_5POINT1;
75 case 8: return CH_LAYOUT_7POINT1;
84 } channel_layout_map[] = {
85 { "mono", 1, CH_LAYOUT_MONO },
86 { "stereo", 2, CH_LAYOUT_STEREO },
87 { "4.0", 4, CH_LAYOUT_4POINT0 },
88 { "quad", 4, CH_LAYOUT_QUAD },
89 { "5.0", 5, CH_LAYOUT_5POINT0 },
90 { "5.0", 5, CH_LAYOUT_5POINT0_BACK },
91 { "5.1", 6, CH_LAYOUT_5POINT1 },
92 { "5.1", 6, CH_LAYOUT_5POINT1_BACK },
93 { "5.1+downmix", 8, CH_LAYOUT_5POINT1|CH_LAYOUT_STEREO_DOWNMIX, },
94 { "7.1", 8, CH_LAYOUT_7POINT1 },
95 { "7.1(wide)", 8, CH_LAYOUT_7POINT1_WIDE },
96 { "7.1+downmix", 10, CH_LAYOUT_7POINT1|CH_LAYOUT_STEREO_DOWNMIX, },
100 int64_t avcodec_get_channel_layout(const char *name)
104 if (!strcmp(channel_layout_map[i].name, name))
105 return channel_layout_map[i].layout;
107 } while (channel_layout_map[i].name);
112 void avcodec_get_channel_layout_string(char *buf, int buf_size, int nb_channels, int64_t channel_layout)
116 for (i=0; channel_layout_map[i].name; i++)
117 if (nb_channels == channel_layout_map[i].nb_channels &&
118 channel_layout == channel_layout_map[i].layout) {
119 av_strlcpy(buf, channel_layout_map[i].name, buf_size);
123 snprintf(buf, buf_size, "%d channels", nb_channels);
124 if (channel_layout) {
126 av_strlcat(buf, " (", buf_size);
127 for(i=0,ch=0; i<64; i++) {
128 if ((channel_layout & (1L<<i))) {
129 const char *name = get_channel_name(i);
131 if (ch>0) av_strlcat(buf, "|", buf_size);
132 av_strlcat(buf, name, buf_size);
137 av_strlcat(buf, ")", buf_size);
141 int avcodec_channel_layout_num_channels(int64_t channel_layout)
144 uint64_t x = channel_layout;
145 for (count = 0; x; count++)
146 x &= x-1; // unset lowest set bit
150 struct AVAudioConvert {
151 int in_channels, out_channels;
155 AVAudioConvert *av_audio_convert_alloc(enum SampleFormat out_fmt, int out_channels,
156 enum SampleFormat in_fmt, int in_channels,
157 const float *matrix, int flags)
160 if (in_channels!=out_channels)
161 return NULL; /* FIXME: not supported */
162 ctx = av_malloc(sizeof(AVAudioConvert));
165 ctx->in_channels = in_channels;
166 ctx->out_channels = out_channels;
167 ctx->fmt_pair = out_fmt + SAMPLE_FMT_NB*in_fmt;
171 void av_audio_convert_free(AVAudioConvert *ctx)
176 int av_audio_convert(AVAudioConvert *ctx,
177 void * const out[6], const int out_stride[6],
178 const void * const in[6], const int in_stride[6], int len)
182 //FIXME optimize common cases
184 for(ch=0; ch<ctx->out_channels; ch++){
185 const int is= in_stride[ch];
186 const int os= out_stride[ch];
187 const uint8_t *pi= in[ch];
188 uint8_t *po= out[ch];
189 uint8_t *end= po + os*len;
193 #define CONV(ofmt, otype, ifmt, expr)\
194 if(ctx->fmt_pair == ofmt + SAMPLE_FMT_NB*ifmt){\
196 *(otype*)po = expr; pi += is; po += os;\
200 //FIXME put things below under ifdefs so we do not waste space for cases no codec will need
203 CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_U8 , *(const uint8_t*)pi)
204 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<8)
205 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<24)
206 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
207 else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
208 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80)
209 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S16, *(const int16_t*)pi)
210 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S16, *(const int16_t*)pi<<16)
211 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15)))
212 else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15)))
213 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80)
214 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S32, *(const int32_t*)pi>>16)
215 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S32, *(const int32_t*)pi)
216 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1<<31)))
217 else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1<<31)))
218 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_FLT, av_clip_uint8( lrintf(*(const float*)pi * (1<<7)) + 0x80))
219 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_FLT, av_clip_int16( lrintf(*(const float*)pi * (1<<15))))
220 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(const float*)pi * (1U<<31))))
221 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_FLT, *(const float*)pi)
222 else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_FLT, *(const float*)pi)
223 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_DBL, av_clip_uint8( lrint(*(const double*)pi * (1<<7)) + 0x80))
224 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_DBL, av_clip_int16( lrint(*(const double*)pi * (1<<15))))
225 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(const double*)pi * (1U<<31))))
226 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_DBL, *(const double*)pi)
227 else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_DBL, *(const double*)pi)