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/* |
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* Copyright (c) 2002 Anders Johansson <ajh@atri.curtin.edu.au> |
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* Copyright (c) 2011 Clément Bœsch <u pkh me> |
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* Copyright (c) 2011 Nicolas George <nicolas.george@normalesup.org> |
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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 |
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* GNU 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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/** |
24 |
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* @file |
25 |
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* Audio panning filter (channels mixing) |
26 |
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* Original code written by Anders Johansson for MPlayer, |
27 |
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* reimplemented for FFmpeg. |
28 |
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*/ |
29 |
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30 |
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#include <stdio.h> |
31 |
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#include "libavutil/avstring.h" |
32 |
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#include "libavutil/channel_layout.h" |
33 |
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#include "libavutil/opt.h" |
34 |
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#include "libswresample/swresample.h" |
35 |
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#include "audio.h" |
36 |
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#include "avfilter.h" |
37 |
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#include "formats.h" |
38 |
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#include "internal.h" |
39 |
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40 |
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#define MAX_CHANNELS 64 |
41 |
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42 |
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typedef struct PanContext { |
43 |
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const AVClass *class; |
44 |
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char *args; |
45 |
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int64_t out_channel_layout; |
46 |
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double gain[MAX_CHANNELS][MAX_CHANNELS]; |
47 |
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int64_t need_renorm; |
48 |
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int need_renumber; |
49 |
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int nb_output_channels; |
50 |
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|
51 |
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int pure_gains; |
52 |
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/* channel mapping specific */ |
53 |
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int channel_map[MAX_CHANNELS]; |
54 |
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struct SwrContext *swr; |
55 |
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} PanContext; |
56 |
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57 |
|
206 |
static void skip_spaces(char **arg) |
58 |
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{ |
59 |
|
206 |
int len = 0; |
60 |
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61 |
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206 |
sscanf(*arg, " %n", &len); |
62 |
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206 |
*arg += len; |
63 |
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206 |
} |
64 |
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65 |
|
103 |
static int parse_channel_name(char **arg, int *rchannel, int *rnamed) |
66 |
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{ |
67 |
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char buf[8]; |
68 |
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103 |
int len, i, channel_id = 0; |
69 |
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int64_t layout, layout0; |
70 |
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71 |
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103 |
skip_spaces(arg); |
72 |
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/* try to parse a channel name, e.g. "FL" */ |
73 |
✓✓ |
103 |
if (sscanf(*arg, "%7[A-Z]%n", buf, &len)) { |
74 |
|
18 |
layout0 = layout = av_get_channel_layout(buf); |
75 |
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/* channel_id <- first set bit in layout */ |
76 |
✓✓ |
126 |
for (i = 32; i > 0; i >>= 1) { |
77 |
✓✓ |
108 |
if (layout >= (int64_t)1 << i) { |
78 |
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15 |
channel_id += i; |
79 |
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15 |
layout >>= i; |
80 |
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} |
81 |
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} |
82 |
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/* reject layouts that are not a single channel */ |
83 |
✓✗✗✓
|
18 |
if (channel_id >= MAX_CHANNELS || layout0 != (int64_t)1 << channel_id) |
84 |
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return AVERROR(EINVAL); |
85 |
|
18 |
*rchannel = channel_id; |
86 |
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18 |
*rnamed = 1; |
87 |
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18 |
*arg += len; |
88 |
|
18 |
return 0; |
89 |
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} |
90 |
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/* try to parse a channel number, e.g. "c2" */ |
91 |
✓✗ |
85 |
if (sscanf(*arg, "c%d%n", &channel_id, &len) && |
92 |
✓✗✓✗
|
85 |
channel_id >= 0 && channel_id < MAX_CHANNELS) { |
93 |
|
85 |
*rchannel = channel_id; |
94 |
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85 |
*rnamed = 0; |
95 |
|
85 |
*arg += len; |
96 |
|
85 |
return 0; |
97 |
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} |
98 |
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return AVERROR(EINVAL); |
99 |
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} |
100 |
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101 |
|
16 |
static av_cold int init(AVFilterContext *ctx) |
102 |
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{ |
103 |
|
16 |
PanContext *const pan = ctx->priv; |
104 |
|
16 |
char *arg, *arg0, *tokenizer, *args = av_strdup(pan->args); |
105 |
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16 |
int out_ch_id, in_ch_id, len, named, ret, sign = 1; |
106 |
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16 |
int nb_in_channels[2] = { 0, 0 }; // number of unnamed and named input channels |
107 |
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16 |
int used_out_ch[MAX_CHANNELS] = {0}; |
108 |
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double gain; |
109 |
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110 |
✗✓ |
16 |
if (!pan->args) { |
111 |
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av_log(ctx, AV_LOG_ERROR, |
112 |
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"pan filter needs a channel layout and a set " |
113 |
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"of channel definitions as parameter\n"); |
114 |
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return AVERROR(EINVAL); |
115 |
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} |
116 |
✗✓ |
16 |
if (!args) |
117 |
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return AVERROR(ENOMEM); |
118 |
|
16 |
arg = av_strtok(args, "|", &tokenizer); |
119 |
✗✓ |
16 |
if (!arg) { |
120 |
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av_log(ctx, AV_LOG_ERROR, "Channel layout not specified\n"); |
121 |
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ret = AVERROR(EINVAL); |
122 |
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goto fail; |
123 |
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} |
124 |
|
16 |
ret = ff_parse_channel_layout(&pan->out_channel_layout, |
125 |
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&pan->nb_output_channels, arg, ctx); |
126 |
✗✓ |
16 |
if (ret < 0) |
127 |
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goto fail; |
128 |
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129 |
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/* parse channel specifications */ |
130 |
✓✓ |
55 |
while ((arg = arg0 = av_strtok(NULL, "|", &tokenizer))) { |
131 |
|
39 |
int used_in_ch[MAX_CHANNELS] = {0}; |
132 |
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/* channel name */ |
133 |
✗✓ |
39 |
if (parse_channel_name(&arg, &out_ch_id, &named)) { |
134 |
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av_log(ctx, AV_LOG_ERROR, |
135 |
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"Expected out channel name, got \"%.8s\"\n", arg); |
136 |
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ret = AVERROR(EINVAL); |
137 |
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goto fail; |
138 |
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} |
139 |
✓✓ |
39 |
if (named) { |
140 |
✗✓ |
7 |
if (!((pan->out_channel_layout >> out_ch_id) & 1)) { |
141 |
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av_log(ctx, AV_LOG_ERROR, |
142 |
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"Channel \"%.8s\" does not exist in the chosen layout\n", arg0); |
143 |
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ret = AVERROR(EINVAL); |
144 |
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goto fail; |
145 |
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} |
146 |
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/* get the channel number in the output channel layout: |
147 |
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* out_channel_layout & ((1 << out_ch_id) - 1) are all the |
148 |
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* channels that come before out_ch_id, |
149 |
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* so their count is the index of out_ch_id */ |
150 |
|
7 |
out_ch_id = av_get_channel_layout_nb_channels(pan->out_channel_layout & (((int64_t)1 << out_ch_id) - 1)); |
151 |
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} |
152 |
✓✗✗✓
|
39 |
if (out_ch_id < 0 || out_ch_id >= pan->nb_output_channels) { |
153 |
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av_log(ctx, AV_LOG_ERROR, |
154 |
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"Invalid out channel name \"%.8s\"\n", arg0); |
155 |
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ret = AVERROR(EINVAL); |
156 |
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goto fail; |
157 |
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} |
158 |
✗✓ |
39 |
if (used_out_ch[out_ch_id]) { |
159 |
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av_log(ctx, AV_LOG_ERROR, |
160 |
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"Can not reference out channel %d twice\n", out_ch_id); |
161 |
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ret = AVERROR(EINVAL); |
162 |
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goto fail; |
163 |
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} |
164 |
|
39 |
used_out_ch[out_ch_id] = 1; |
165 |
|
39 |
skip_spaces(&arg); |
166 |
✓✓ |
39 |
if (*arg == '=') { |
167 |
|
35 |
arg++; |
168 |
✓✗ |
4 |
} else if (*arg == '<') { |
169 |
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4 |
pan->need_renorm |= (int64_t)1 << out_ch_id; |
170 |
|
4 |
arg++; |
171 |
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} else { |
172 |
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av_log(ctx, AV_LOG_ERROR, |
173 |
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"Syntax error after channel name in \"%.8s\"\n", arg0); |
174 |
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ret = AVERROR(EINVAL); |
175 |
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goto fail; |
176 |
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} |
177 |
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/* gains */ |
178 |
|
39 |
sign = 1; |
179 |
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while (1) { |
180 |
|
64 |
gain = 1; |
181 |
✓✓ |
64 |
if (sscanf(arg, "%lf%n *%n", &gain, &len, &len)) |
182 |
|
18 |
arg += len; |
183 |
✗✓ |
64 |
if (parse_channel_name(&arg, &in_ch_id, &named)){ |
184 |
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av_log(ctx, AV_LOG_ERROR, |
185 |
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"Expected in channel name, got \"%.8s\"\n", arg); |
186 |
|
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ret = AVERROR(EINVAL); |
187 |
|
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goto fail; |
188 |
|
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} |
189 |
|
64 |
nb_in_channels[named]++; |
190 |
✗✓ |
64 |
if (nb_in_channels[!named]) { |
191 |
|
|
av_log(ctx, AV_LOG_ERROR, |
192 |
|
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"Can not mix named and numbered channels\n"); |
193 |
|
|
ret = AVERROR(EINVAL); |
194 |
|
|
goto fail; |
195 |
|
|
} |
196 |
✗✓ |
64 |
if (used_in_ch[in_ch_id]) { |
197 |
|
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av_log(ctx, AV_LOG_ERROR, |
198 |
|
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"Can not reference in channel %d twice\n", in_ch_id); |
199 |
|
|
ret = AVERROR(EINVAL); |
200 |
|
|
goto fail; |
201 |
|
|
} |
202 |
|
64 |
used_in_ch[in_ch_id] = 1; |
203 |
|
64 |
pan->gain[out_ch_id][in_ch_id] = sign * gain; |
204 |
|
64 |
skip_spaces(&arg); |
205 |
✓✓ |
64 |
if (!*arg) |
206 |
|
39 |
break; |
207 |
✓✓ |
25 |
if (*arg == '-') { |
208 |
|
9 |
sign = -1; |
209 |
✗✓ |
16 |
} else if (*arg != '+') { |
210 |
|
|
av_log(ctx, AV_LOG_ERROR, "Syntax error near \"%.8s\"\n", arg); |
211 |
|
|
ret = AVERROR(EINVAL); |
212 |
|
|
goto fail; |
213 |
|
|
} else { |
214 |
|
16 |
sign = 1; |
215 |
|
|
} |
216 |
|
25 |
arg++; |
217 |
|
|
} |
218 |
|
|
} |
219 |
|
16 |
pan->need_renumber = !!nb_in_channels[1]; |
220 |
|
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|
221 |
|
16 |
ret = 0; |
222 |
|
16 |
fail: |
223 |
|
16 |
av_free(args); |
224 |
|
16 |
return ret; |
225 |
|
|
} |
226 |
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|
227 |
|
16 |
static int are_gains_pure(const PanContext *pan) |
228 |
|
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{ |
229 |
|
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int i, j; |
230 |
|
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|
231 |
✓✓ |
528 |
for (i = 0; i < MAX_CHANNELS; i++) { |
232 |
|
520 |
int nb_gain = 0; |
233 |
|
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|
234 |
✓✓ |
33296 |
for (j = 0; j < MAX_CHANNELS; j++) { |
235 |
|
32784 |
double gain = pan->gain[i][j]; |
236 |
|
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|
237 |
|
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/* channel mapping is effective only if 0% or 100% of a channel is |
238 |
|
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* selected... */ |
239 |
✓✓✓✓
|
32784 |
if (gain != 0. && gain != 1.) |
240 |
|
7 |
return 0; |
241 |
|
|
/* ...and if the output channel is only composed of one input */ |
242 |
✓✓✓✓
|
32777 |
if (gain && nb_gain++) |
243 |
|
1 |
return 0; |
244 |
|
|
} |
245 |
|
|
} |
246 |
|
8 |
return 1; |
247 |
|
|
} |
248 |
|
|
|
249 |
|
16 |
static int query_formats(AVFilterContext *ctx) |
250 |
|
|
{ |
251 |
|
16 |
PanContext *pan = ctx->priv; |
252 |
|
16 |
AVFilterLink *inlink = ctx->inputs[0]; |
253 |
|
16 |
AVFilterLink *outlink = ctx->outputs[0]; |
254 |
|
16 |
AVFilterFormats *formats = NULL; |
255 |
|
|
AVFilterChannelLayouts *layouts; |
256 |
|
|
int ret; |
257 |
|
|
|
258 |
|
16 |
pan->pure_gains = are_gains_pure(pan); |
259 |
|
|
/* libswr supports any sample and packing formats */ |
260 |
✗✓ |
16 |
if ((ret = ff_set_common_formats(ctx, ff_all_formats(AVMEDIA_TYPE_AUDIO))) < 0) |
261 |
|
|
return ret; |
262 |
|
|
|
263 |
|
16 |
formats = ff_all_samplerates(); |
264 |
✗✓ |
16 |
if ((ret = ff_set_common_samplerates(ctx, formats)) < 0) |
265 |
|
|
return ret; |
266 |
|
|
|
267 |
|
|
// inlink supports any channel layout |
268 |
|
16 |
layouts = ff_all_channel_counts(); |
269 |
✗✓ |
16 |
if ((ret = ff_channel_layouts_ref(layouts, &inlink->outcfg.channel_layouts)) < 0) |
270 |
|
|
return ret; |
271 |
|
|
|
272 |
|
|
// outlink supports only requested output channel layout |
273 |
|
16 |
layouts = NULL; |
274 |
✗✓ |
16 |
if ((ret = ff_add_channel_layout(&layouts, |
275 |
✓✓ |
16 |
pan->out_channel_layout ? pan->out_channel_layout : |
276 |
|
5 |
FF_COUNT2LAYOUT(pan->nb_output_channels))) < 0) |
277 |
|
|
return ret; |
278 |
|
16 |
return ff_channel_layouts_ref(layouts, &outlink->incfg.channel_layouts); |
279 |
|
|
} |
280 |
|
|
|
281 |
|
16 |
static int config_props(AVFilterLink *link) |
282 |
|
|
{ |
283 |
|
16 |
AVFilterContext *ctx = link->dst; |
284 |
|
16 |
PanContext *pan = ctx->priv; |
285 |
|
|
char buf[1024], *cur; |
286 |
|
|
int i, j, k, r; |
287 |
|
|
double t; |
288 |
|
|
|
289 |
✓✓ |
16 |
if (pan->need_renumber) { |
290 |
|
|
// input channels were given by their name: renumber them |
291 |
✓✓ |
195 |
for (i = j = 0; i < MAX_CHANNELS; i++) { |
292 |
✓✓ |
192 |
if ((link->channel_layout >> i) & 1) { |
293 |
✓✓ |
25 |
for (k = 0; k < pan->nb_output_channels; k++) |
294 |
|
16 |
pan->gain[k][j] = pan->gain[k][i]; |
295 |
|
9 |
j++; |
296 |
|
|
} |
297 |
|
|
} |
298 |
|
|
} |
299 |
|
|
|
300 |
|
|
// sanity check; can't be done in query_formats since the inlink |
301 |
|
|
// channel layout is unknown at that time |
302 |
✓✗ |
16 |
if (link->channels > MAX_CHANNELS || |
303 |
✗✓ |
16 |
pan->nb_output_channels > MAX_CHANNELS) { |
304 |
|
|
av_log(ctx, AV_LOG_ERROR, |
305 |
|
|
"af_pan supports a maximum of %d channels. " |
306 |
|
|
"Feel free to ask for a higher limit.\n", MAX_CHANNELS); |
307 |
|
|
return AVERROR_PATCHWELCOME; |
308 |
|
|
} |
309 |
|
|
|
310 |
|
|
// init libswresample context |
311 |
|
32 |
pan->swr = swr_alloc_set_opts(pan->swr, |
312 |
|
16 |
pan->out_channel_layout, link->format, link->sample_rate, |
313 |
|
16 |
link->channel_layout, link->format, link->sample_rate, |
314 |
|
|
0, ctx); |
315 |
✗✓ |
16 |
if (!pan->swr) |
316 |
|
|
return AVERROR(ENOMEM); |
317 |
✓✓ |
16 |
if (!link->channel_layout) { |
318 |
✗✓ |
3 |
if (av_opt_set_int(pan->swr, "ich", link->channels, 0) < 0) |
319 |
|
|
return AVERROR(EINVAL); |
320 |
|
|
} |
321 |
✓✓ |
16 |
if (!pan->out_channel_layout) { |
322 |
✗✓ |
5 |
if (av_opt_set_int(pan->swr, "och", pan->nb_output_channels, 0) < 0) |
323 |
|
|
return AVERROR(EINVAL); |
324 |
|
|
} |
325 |
|
|
|
326 |
|
|
// gains are pure, init the channel mapping |
327 |
✓✓ |
16 |
if (pan->pure_gains) { |
328 |
|
|
|
329 |
|
|
// get channel map from the pure gains |
330 |
✓✓ |
21 |
for (i = 0; i < pan->nb_output_channels; i++) { |
331 |
|
13 |
int ch_id = -1; |
332 |
✓✓ |
21 |
for (j = 0; j < link->channels; j++) { |
333 |
✓✓ |
19 |
if (pan->gain[i][j]) { |
334 |
|
11 |
ch_id = j; |
335 |
|
11 |
break; |
336 |
|
|
} |
337 |
|
|
} |
338 |
|
13 |
pan->channel_map[i] = ch_id; |
339 |
|
|
} |
340 |
|
|
|
341 |
|
8 |
av_opt_set_int(pan->swr, "icl", pan->out_channel_layout, 0); |
342 |
|
8 |
av_opt_set_int(pan->swr, "uch", pan->nb_output_channels, 0); |
343 |
|
8 |
swr_set_channel_mapping(pan->swr, pan->channel_map); |
344 |
|
|
} else { |
345 |
|
|
// renormalize |
346 |
✓✓ |
35 |
for (i = 0; i < pan->nb_output_channels; i++) { |
347 |
✓✓ |
27 |
if (!((pan->need_renorm >> i) & 1)) |
348 |
|
23 |
continue; |
349 |
|
4 |
t = 0; |
350 |
✓✓ |
16 |
for (j = 0; j < link->channels; j++) |
351 |
|
12 |
t += fabs(pan->gain[i][j]); |
352 |
✓✗✗✓
|
4 |
if (t > -1E-5 && t < 1E-5) { |
353 |
|
|
// t is almost 0 but not exactly, this is probably a mistake |
354 |
|
|
if (t) |
355 |
|
|
av_log(ctx, AV_LOG_WARNING, |
356 |
|
|
"Degenerate coefficients while renormalizing\n"); |
357 |
|
|
continue; |
358 |
|
|
} |
359 |
✓✓ |
16 |
for (j = 0; j < link->channels; j++) |
360 |
|
12 |
pan->gain[i][j] /= t; |
361 |
|
|
} |
362 |
|
8 |
av_opt_set_int(pan->swr, "icl", link->channel_layout, 0); |
363 |
|
8 |
av_opt_set_int(pan->swr, "ocl", pan->out_channel_layout, 0); |
364 |
|
8 |
swr_set_matrix(pan->swr, pan->gain[0], pan->gain[1] - pan->gain[0]); |
365 |
|
|
} |
366 |
|
|
|
367 |
|
16 |
r = swr_init(pan->swr); |
368 |
✗✓ |
16 |
if (r < 0) |
369 |
|
|
return r; |
370 |
|
|
|
371 |
|
|
// summary |
372 |
✓✓ |
56 |
for (i = 0; i < pan->nb_output_channels; i++) { |
373 |
|
40 |
cur = buf; |
374 |
✓✓ |
207 |
for (j = 0; j < link->channels; j++) { |
375 |
✓✓ |
167 |
r = snprintf(cur, buf + sizeof(buf) - cur, "%s%.3g i%d", |
376 |
|
|
j ? " + " : "", pan->gain[i][j], j); |
377 |
✓✗ |
167 |
cur += FFMIN(buf + sizeof(buf) - cur, r); |
378 |
|
|
} |
379 |
|
40 |
av_log(ctx, AV_LOG_VERBOSE, "o%d = %s\n", i, buf); |
380 |
|
|
} |
381 |
|
|
// add channel mapping summary if possible |
382 |
✓✓ |
16 |
if (pan->pure_gains) { |
383 |
|
8 |
av_log(ctx, AV_LOG_INFO, "Pure channel mapping detected:"); |
384 |
✓✓ |
21 |
for (i = 0; i < pan->nb_output_channels; i++) |
385 |
✓✓ |
13 |
if (pan->channel_map[i] < 0) |
386 |
|
2 |
av_log(ctx, AV_LOG_INFO, " M"); |
387 |
|
|
else |
388 |
|
11 |
av_log(ctx, AV_LOG_INFO, " %d", pan->channel_map[i]); |
389 |
|
8 |
av_log(ctx, AV_LOG_INFO, "\n"); |
390 |
|
8 |
return 0; |
391 |
|
|
} |
392 |
|
8 |
return 0; |
393 |
|
|
} |
394 |
|
|
|
395 |
|
2076 |
static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) |
396 |
|
|
{ |
397 |
|
|
int ret; |
398 |
|
2076 |
int n = insamples->nb_samples; |
399 |
|
2076 |
AVFilterLink *const outlink = inlink->dst->outputs[0]; |
400 |
|
2076 |
AVFrame *outsamples = ff_get_audio_buffer(outlink, n); |
401 |
|
2076 |
PanContext *pan = inlink->dst->priv; |
402 |
|
|
|
403 |
✗✓ |
2076 |
if (!outsamples) { |
404 |
|
|
av_frame_free(&insamples); |
405 |
|
|
return AVERROR(ENOMEM); |
406 |
|
|
} |
407 |
|
2076 |
swr_convert(pan->swr, outsamples->extended_data, n, |
408 |
|
2076 |
(void *)insamples->extended_data, n); |
409 |
|
2076 |
av_frame_copy_props(outsamples, insamples); |
410 |
|
2076 |
outsamples->channel_layout = outlink->channel_layout; |
411 |
|
2076 |
outsamples->channels = outlink->channels; |
412 |
|
|
|
413 |
|
2076 |
ret = ff_filter_frame(outlink, outsamples); |
414 |
|
2076 |
av_frame_free(&insamples); |
415 |
|
2076 |
return ret; |
416 |
|
|
} |
417 |
|
|
|
418 |
|
16 |
static av_cold void uninit(AVFilterContext *ctx) |
419 |
|
|
{ |
420 |
|
16 |
PanContext *pan = ctx->priv; |
421 |
|
16 |
swr_free(&pan->swr); |
422 |
|
16 |
} |
423 |
|
|
|
424 |
|
|
#define OFFSET(x) offsetof(PanContext, x) |
425 |
|
|
|
426 |
|
|
static const AVOption pan_options[] = { |
427 |
|
|
{ "args", NULL, OFFSET(args), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM }, |
428 |
|
|
{ NULL } |
429 |
|
|
}; |
430 |
|
|
|
431 |
|
|
AVFILTER_DEFINE_CLASS(pan); |
432 |
|
|
|
433 |
|
|
static const AVFilterPad pan_inputs[] = { |
434 |
|
|
{ |
435 |
|
|
.name = "default", |
436 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
437 |
|
|
.config_props = config_props, |
438 |
|
|
.filter_frame = filter_frame, |
439 |
|
|
}, |
440 |
|
|
{ NULL } |
441 |
|
|
}; |
442 |
|
|
|
443 |
|
|
static const AVFilterPad pan_outputs[] = { |
444 |
|
|
{ |
445 |
|
|
.name = "default", |
446 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
447 |
|
|
}, |
448 |
|
|
{ NULL } |
449 |
|
|
}; |
450 |
|
|
|
451 |
|
|
AVFilter ff_af_pan = { |
452 |
|
|
.name = "pan", |
453 |
|
|
.description = NULL_IF_CONFIG_SMALL("Remix channels with coefficients (panning)."), |
454 |
|
|
.priv_size = sizeof(PanContext), |
455 |
|
|
.priv_class = &pan_class, |
456 |
|
|
.init = init, |
457 |
|
|
.uninit = uninit, |
458 |
|
|
.query_formats = query_formats, |
459 |
|
|
.inputs = pan_inputs, |
460 |
|
|
.outputs = pan_outputs, |
461 |
|
|
}; |