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
32typedef struct SampleFmtInfo {
33    const char *name;
34    int bits;
35} SampleFmtInfo;
36
37/** this table gives more information about formats */
38static 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
46const 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
53enum 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
63void 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
74static 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
82const 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
89int64_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
103static 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    { "5.1",         6,  CH_LAYOUT_5POINT1 },
114    { "5.1+downmix", 8,  CH_LAYOUT_5POINT1|CH_LAYOUT_STEREO_DOWNMIX, },
115    { "7.1",         8,  CH_LAYOUT_7POINT1 },
116    { "7.1(wide)",   8,  CH_LAYOUT_7POINT1_WIDE },
117    { "7.1+downmix", 10, CH_LAYOUT_7POINT1|CH_LAYOUT_STEREO_DOWNMIX, },
118    { 0 }
119};
120
121void avcodec_get_channel_layout_string(char *buf, int buf_size, int nb_channels, int64_t channel_layout)
122{
123    int i;
124
125    if (channel_layout==0)
126        channel_layout = avcodec_guess_channel_layout(nb_channels, CODEC_ID_NONE, NULL);
127
128    for (i=0; channel_layout_map[i].name; i++)
129        if (nb_channels    == channel_layout_map[i].nb_channels &&
130            channel_layout == channel_layout_map[i].layout) {
131            av_strlcpy(buf, channel_layout_map[i].name, buf_size);
132            return;
133        }
134
135    snprintf(buf, buf_size, "%d channels", nb_channels);
136    if (channel_layout) {
137        int i,ch;
138        av_strlcat(buf, " (", buf_size);
139        for(i=0,ch=0; i<64; i++) {
140            if ((channel_layout & (1L<<i))) {
141                const char *name = get_channel_name(i);
142                if (name) {
143                    if (ch>0) av_strlcat(buf, "|", buf_size);
144                    av_strlcat(buf, name, buf_size);
145                }
146                ch++;
147            }
148        }
149        av_strlcat(buf, ")", buf_size);
150    }
151}
152
153struct AVAudioConvert {
154    int in_channels, out_channels;
155    int fmt_pair;
156};
157
158AVAudioConvert *av_audio_convert_alloc(enum SampleFormat out_fmt, int out_channels,
159                                       enum SampleFormat in_fmt, int in_channels,
160                                       const float *matrix, int flags)
161{
162    AVAudioConvert *ctx;
163    if (in_channels!=out_channels)
164        return NULL;  /* FIXME: not supported */
165    ctx = av_malloc(sizeof(AVAudioConvert));
166    if (!ctx)
167        return NULL;
168    ctx->in_channels = in_channels;
169    ctx->out_channels = out_channels;
170    ctx->fmt_pair = out_fmt + SAMPLE_FMT_NB*in_fmt;
171    return ctx;
172}
173
174void av_audio_convert_free(AVAudioConvert *ctx)
175{
176    av_free(ctx);
177}
178
179int av_audio_convert(AVAudioConvert *ctx,
180                           void * const out[6], const int out_stride[6],
181                     const void * const  in[6], const int  in_stride[6], int len)
182{
183    int ch;
184
185    //FIXME optimize common cases
186
187    for(ch=0; ch<ctx->out_channels; ch++){
188        const int is=  in_stride[ch];
189        const int os= out_stride[ch];
190        const uint8_t *pi=  in[ch];
191        uint8_t *po= out[ch];
192        uint8_t *end= po + os*len;
193        if(!out[ch])
194            continue;
195
196#define CONV(ofmt, otype, ifmt, expr)\
197if(ctx->fmt_pair == ofmt + SAMPLE_FMT_NB*ifmt){\
198    do{\
199        *(otype*)po = expr; pi += is; po += os;\
200    }while(po < end);\
201}
202
203//FIXME put things below under ifdefs so we do not waste space for cases no codec will need
204//FIXME rounding and clipping ?
205
206             CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_U8 ,  *(const uint8_t*)pi)
207        else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<8)
208        else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)<<24)
209        else CONV(SAMPLE_FMT_FLT, float  , SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
210        else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_U8 , (*(const uint8_t*)pi - 0x80)*(1.0 / (1<<7)))
211        else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S16, (*(const int16_t*)pi>>8) + 0x80)
212        else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S16,  *(const int16_t*)pi)
213        else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S16,  *(const int16_t*)pi<<16)
214        else CONV(SAMPLE_FMT_FLT, float  , SAMPLE_FMT_S16,  *(const int16_t*)pi*(1.0 / (1<<15)))
215        else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_S16,  *(const int16_t*)pi*(1.0 / (1<<15)))
216        else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_S32, (*(const int32_t*)pi>>24) + 0x80)
217        else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_S32,  *(const int32_t*)pi>>16)
218        else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_S32,  *(const int32_t*)pi)
219        else CONV(SAMPLE_FMT_FLT, float  , SAMPLE_FMT_S32,  *(const int32_t*)pi*(1.0 / (1<<31)))
220        else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_S32,  *(const int32_t*)pi*(1.0 / (1<<31)))
221        else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_FLT, lrintf(*(const float*)pi * (1<<7)) + 0x80)
222        else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_FLT, lrintf(*(const float*)pi * (1<<15)))
223        else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_FLT, lrintf(*(const float*)pi * (1<<31)))
224        else CONV(SAMPLE_FMT_FLT, float  , SAMPLE_FMT_FLT, *(const float*)pi)
225        else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_FLT, *(const float*)pi)
226        else CONV(SAMPLE_FMT_U8 , uint8_t, SAMPLE_FMT_DBL, lrint(*(const double*)pi * (1<<7)) + 0x80)
227        else CONV(SAMPLE_FMT_S16, int16_t, SAMPLE_FMT_DBL, lrint(*(const double*)pi * (1<<15)))
228        else CONV(SAMPLE_FMT_S32, int32_t, SAMPLE_FMT_DBL, lrint(*(const double*)pi * (1<<31)))
229        else CONV(SAMPLE_FMT_FLT, float  , SAMPLE_FMT_DBL, *(const double*)pi)
230        else CONV(SAMPLE_FMT_DBL, double , SAMPLE_FMT_DBL, *(const double*)pi)
231        else return -1;
232    }
233    return 0;
234}
235