94c06f83df80e69547c15c68fe747224dc545bc2
[libav.git] / libavcodec / audioconvert.c
1 /*
2 * audio conversion
3 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file libavcodec/audioconvert.c
24 * audio conversion
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28 #include "libavutil/avstring.h"
29 #include "avcodec.h"
30 #include "audioconvert.h"
31
32 typedef struct SampleFmtInfo {
33 const char *name;
34 int bits;
35 } SampleFmtInfo;
36
37 /** this table gives more information about formats */
38 static const SampleFmtInfo sample_fmt_info[SAMPLE_FMT_NB] = {
39 [SAMPLE_FMT_U8] = { .name = "u8", .bits = 8 },
40 [SAMPLE_FMT_S16] = { .name = "s16", .bits = 16 },
41 [SAMPLE_FMT_S32] = { .name = "s32", .bits = 32 },
42 [SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32 },
43 [SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64 },
44 };
45
46 const char *avcodec_get_sample_fmt_name(int sample_fmt)
47 {
48 if (sample_fmt < 0 || sample_fmt >= SAMPLE_FMT_NB)
49 return NULL;
50 return sample_fmt_info[sample_fmt].name;
51 }
52
53 enum SampleFormat avcodec_get_sample_fmt(const char* name)
54 {
55 int i;
56
57 for (i=0; i < SAMPLE_FMT_NB; i++)
58 if (!strcmp(sample_fmt_info[i].name, name))
59 return i;
60 return SAMPLE_FMT_NONE;
61 }
62
63 void avcodec_sample_fmt_string (char *buf, int buf_size, int sample_fmt)
64 {
65 /* print header */
66 if (sample_fmt < 0)
67 snprintf (buf, buf_size, "name " " depth");
68 else if (sample_fmt < SAMPLE_FMT_NB) {
69 SampleFmtInfo info= sample_fmt_info[sample_fmt];
70 snprintf (buf, buf_size, "%-6s" " %2d ", info.name, info.bits);
71 }
72 }
73
74 static const char* const channel_names[]={
75 "FL", "FR", "FC", "LFE", "BL", "BR", "FLC", "FRC",
76 "BC", "SL", "SR", "TC", "TFL", "TFC", "TFR", "TBL",
77 "TBC", "TBR",
78 [29] = "DL",
79 [30] = "DR",
80 };
81
82 const char *get_channel_name(int channel_id)
83 {
84 if (channel_id<0 || channel_id>=FF_ARRAY_ELEMS(channel_names))
85 return NULL;
86 return channel_names[channel_id];
87 }
88
89 int64_t avcodec_guess_channel_layout(int nb_channels, enum CodecID codec_id, const char *fmt_name)
90 {
91 switch(nb_channels) {
92 case 1: return CH_LAYOUT_MONO;
93 case 2: return CH_LAYOUT_STEREO;
94 case 3: return CH_LAYOUT_SURROUND;
95 case 4: return CH_LAYOUT_QUAD;
96 case 5: return CH_LAYOUT_5POINT0;
97 case 6: return CH_LAYOUT_5POINT1;
98 case 8: return CH_LAYOUT_7POINT1;
99 default: return 0;
100 }
101 }
102
103 static const struct {
104 const char *name;
105 int nb_channels;
106 int64_t layout;
107 } channel_layout_map[] = {
108 { "mono", 1, CH_LAYOUT_MONO },
109 { "stereo", 2, CH_LAYOUT_STEREO },
110 { "surround", 3, CH_LAYOUT_SURROUND },
111 { "quad", 4, CH_LAYOUT_QUAD },
112 { "5.0", 5, CH_LAYOUT_5POINT0 },
113 { "5.0", 5, CH_LAYOUT_5POINT0_BACK },
114 { "5.1", 6, CH_LAYOUT_5POINT1 },
115 { "5.1", 6, CH_LAYOUT_5POINT1_BACK },
116 { "5.1+downmix", 8, CH_LAYOUT_5POINT1|CH_LAYOUT_STEREO_DOWNMIX, },
117 { "7.1", 8, CH_LAYOUT_7POINT1 },
118 { "7.1(wide)", 8, CH_LAYOUT_7POINT1_WIDE },
119 { "7.1+downmix", 10, CH_LAYOUT_7POINT1|CH_LAYOUT_STEREO_DOWNMIX, },
120 { 0 }
121 };
122
123 void avcodec_get_channel_layout_string(char *buf, int buf_size, int nb_channels, int64_t channel_layout)
124 {
125 int i;
126
127 if (channel_layout==0)
128 channel_layout = avcodec_guess_channel_layout(nb_channels, CODEC_ID_NONE, NULL);
129
130 for (i=0; channel_layout_map[i].name; i++)
131 if (nb_channels == channel_layout_map[i].nb_channels &&
132 channel_layout == channel_layout_map[i].layout) {
133 av_strlcpy(buf, channel_layout_map[i].name, buf_size);
134 return;
135 }
136
137 snprintf(buf, buf_size, "%d channels", nb_channels);
138 if (channel_layout) {
139 int i,ch;
140 av_strlcat(buf, " (", buf_size);
141 for(i=0,ch=0; i<64; i++) {
142 if ((channel_layout & (1L<<i))) {
143 const char *name = get_channel_name(i);
144 if (name) {
145 if (ch>0) av_strlcat(buf, "|", buf_size);
146 av_strlcat(buf, name, buf_size);
147 }
148 ch++;
149 }
150 }
151 av_strlcat(buf, ")", buf_size);
152 }
153 }
154
155 struct AVAudioConvert {
156 int in_channels, out_channels;
157 int fmt_pair;
158 };
159
160 AVAudioConvert *av_audio_convert_alloc(enum SampleFormat out_fmt, int out_channels,
161 enum SampleFormat in_fmt, int in_channels,
162 const float *matrix, int flags)
163 {
164 AVAudioConvert *ctx;
165 if (in_channels!=out_channels)
166 return NULL; /* FIXME: not supported */
167 ctx = av_malloc(sizeof(AVAudioConvert));
168 if (!ctx)
169 return NULL;
170 ctx->in_channels = in_channels;
171 ctx->out_channels = out_channels;
172 ctx->fmt_pair = out_fmt + SAMPLE_FMT_NB*in_fmt;
173 return ctx;
174 }
175
176 void av_audio_convert_free(AVAudioConvert *ctx)
177 {
178 av_free(ctx);
179 }
180
181 int av_audio_convert(AVAudioConvert *ctx,
182 void * const out[6], const int out_stride[6],
183 const void * const in[6], const int in_stride[6], int len)
184 {
185 int ch;
186
187 //FIXME optimize common cases
188
189 for(ch=0; ch<ctx->out_channels; ch++){
190 const int is= in_stride[ch];
191 const int os= out_stride[ch];
192 const uint8_t *pi= in[ch];
193 uint8_t *po= out[ch];
194 uint8_t *end= po + os*len;
195 if(!out[ch])
196 continue;
197
198 #define CONV(ofmt, otype, ifmt, expr)\
199 if(ctx->fmt_pair == ofmt + SAMPLE_FMT_NB*ifmt){\
200 do{\
201 *(otype*)po = expr; pi += is; po += os;\
202 }while(po < end);\
203 }
204
205 //FIXME put things below under ifdefs so we do not waste space for cases no codec will need
206 //FIXME rounding and clipping ?
207
208 CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_U8 , *(const uint8_t*)pi)
209 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<8)
210 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<24)
211 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
212 else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
213 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80)
214 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S16, *(const int16_t*)pi)
215 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S16, *(const int16_t*)pi<<16)
216 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15)))
217 else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_S16, *(const int16_t*)pi*(1.0 / (1<<15)))
218 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80)
219 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S32, *(const int32_t*)pi>>16)
220 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S32, *(const int32_t*)pi)
221 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1<<31)))
222 else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_S32, *(const int32_t*)pi*(1.0 / (1<<31)))
223 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_FLT, lrintf(*(const float*)pi * (1<<7)) + 0x80)
224 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_FLT, lrintf(*(const float*)pi * (1<<15)))
225 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_FLT, lrintf(*(const float*)pi * (1<<31)))
226 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_FLT, *(const float*)pi)
227 else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_FLT, *(const float*)pi)
228 else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_DBL, lrint(*(const double*)pi * (1<<7)) + 0x80)
229 else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_DBL, lrint(*(const double*)pi * (1<<15)))
230 else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_DBL, lrint(*(const double*)pi * (1<<31)))
231 else CONV(SAMPLE_FMT_FLT, float , SAMPLE_FMT_DBL, *(const double*)pi)
232 else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_DBL, *(const double*)pi)
233 else return -1;
234 }
235 return 0;
236 }