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1 | /* |
2 | * Copyright (c) 2012 Google, Inc. | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | /** | |
22 | * @file | |
23 | * audio channel mapping filter | |
24 | */ | |
25 | ||
26 | #include <ctype.h> | |
27 | ||
28 | #include "libavutil/avstring.h" | |
29 | #include "libavutil/channel_layout.h" | |
30 | #include "libavutil/common.h" | |
31 | #include "libavutil/mathematics.h" | |
32 | #include "libavutil/opt.h" | |
33 | #include "libavutil/samplefmt.h" | |
34 | ||
35 | #include "audio.h" | |
36 | #include "avfilter.h" | |
37 | #include "formats.h" | |
38 | #include "internal.h" | |
39 | ||
40 | struct ChannelMap { | |
41 | uint64_t in_channel; | |
42 | uint64_t out_channel; | |
43 | int in_channel_idx; | |
44 | int out_channel_idx; | |
45 | }; | |
46 | ||
47 | enum MappingMode { | |
48 | MAP_NONE, | |
49 | MAP_ONE_INT, | |
50 | MAP_ONE_STR, | |
51 | MAP_PAIR_INT_INT, | |
52 | MAP_PAIR_INT_STR, | |
53 | MAP_PAIR_STR_INT, | |
54 | MAP_PAIR_STR_STR | |
55 | }; | |
56 | ||
57 | #define MAX_CH 64 | |
58 | typedef struct ChannelMapContext { | |
59 | const AVClass *class; | |
60 | AVFilterChannelLayouts *channel_layouts; | |
61 | char *mapping_str; | |
62 | char *channel_layout_str; | |
63 | uint64_t output_layout; | |
64 | struct ChannelMap map[MAX_CH]; | |
65 | int nch; | |
66 | enum MappingMode mode; | |
67 | } ChannelMapContext; | |
68 | ||
69 | #define OFFSET(x) offsetof(ChannelMapContext, x) | |
70 | #define A AV_OPT_FLAG_AUDIO_PARAM | |
71 | #define F AV_OPT_FLAG_FILTERING_PARAM | |
72 | static const AVOption channelmap_options[] = { | |
73 | { "map", "A comma-separated list of input channel numbers in output order.", | |
74 | OFFSET(mapping_str), AV_OPT_TYPE_STRING, .flags = A|F }, | |
75 | { "channel_layout", "Output channel layout.", | |
76 | OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A|F }, | |
77 | { NULL } | |
78 | }; | |
79 | ||
80 | AVFILTER_DEFINE_CLASS(channelmap); | |
81 | ||
82 | static char* split(char *message, char delim) { | |
83 | char *next = strchr(message, delim); | |
84 | if (next) | |
85 | *next++ = '\0'; | |
86 | return next; | |
87 | } | |
88 | ||
89 | static int get_channel_idx(char **map, int *ch, char delim, int max_ch) | |
90 | { | |
91 | char *next = split(*map, delim); | |
92 | int len; | |
93 | int n = 0; | |
94 | if (!next && delim == '-') | |
95 | return AVERROR(EINVAL); | |
96 | len = strlen(*map); | |
97 | sscanf(*map, "%d%n", ch, &n); | |
98 | if (n != len) | |
99 | return AVERROR(EINVAL); | |
100 | if (*ch < 0 || *ch > max_ch) | |
101 | return AVERROR(EINVAL); | |
102 | *map = next; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static int get_channel(char **map, uint64_t *ch, char delim) | |
107 | { | |
108 | char *next = split(*map, delim); | |
109 | if (!next && delim == '-') | |
110 | return AVERROR(EINVAL); | |
111 | *ch = av_get_channel_layout(*map); | |
112 | if (av_get_channel_layout_nb_channels(*ch) != 1) | |
113 | return AVERROR(EINVAL); | |
114 | *map = next; | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static av_cold int channelmap_init(AVFilterContext *ctx) | |
119 | { | |
120 | ChannelMapContext *s = ctx->priv; | |
121 | char *mapping, separator = '|'; | |
122 | int map_entries = 0; | |
123 | char buf[256]; | |
124 | enum MappingMode mode; | |
125 | uint64_t out_ch_mask = 0; | |
126 | int i; | |
127 | ||
128 | mapping = s->mapping_str; | |
129 | ||
130 | if (!mapping) { | |
131 | mode = MAP_NONE; | |
132 | } else { | |
133 | char *dash = strchr(mapping, '-'); | |
134 | if (!dash) { // short mapping | |
135 | if (av_isdigit(*mapping)) | |
136 | mode = MAP_ONE_INT; | |
137 | else | |
138 | mode = MAP_ONE_STR; | |
139 | } else if (av_isdigit(*mapping)) { | |
140 | if (av_isdigit(*(dash+1))) | |
141 | mode = MAP_PAIR_INT_INT; | |
142 | else | |
143 | mode = MAP_PAIR_INT_STR; | |
144 | } else { | |
145 | if (av_isdigit(*(dash+1))) | |
146 | mode = MAP_PAIR_STR_INT; | |
147 | else | |
148 | mode = MAP_PAIR_STR_STR; | |
149 | } | |
150 | #if FF_API_OLD_FILTER_OPTS | |
151 | if (strchr(mapping, ',')) { | |
152 | av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use " | |
153 | "'|' to separate the mappings.\n"); | |
154 | separator = ','; | |
155 | } | |
156 | #endif | |
157 | } | |
158 | ||
159 | if (mode != MAP_NONE) { | |
160 | char *sep = mapping; | |
161 | map_entries = 1; | |
162 | while ((sep = strchr(sep, separator))) { | |
163 | if (*++sep) // Allow trailing comma | |
164 | map_entries++; | |
165 | } | |
166 | } | |
167 | ||
168 | if (map_entries > MAX_CH) { | |
169 | av_log(ctx, AV_LOG_ERROR, "Too many channels mapped: '%d'.\n", map_entries); | |
170 | return AVERROR(EINVAL); | |
171 | } | |
172 | ||
173 | for (i = 0; i < map_entries; i++) { | |
174 | int in_ch_idx = -1, out_ch_idx = -1; | |
175 | uint64_t in_ch = 0, out_ch = 0; | |
176 | static const char err[] = "Failed to parse channel map\n"; | |
177 | switch (mode) { | |
178 | case MAP_ONE_INT: | |
179 | if (get_channel_idx(&mapping, &in_ch_idx, separator, MAX_CH) < 0) { | |
180 | av_log(ctx, AV_LOG_ERROR, err); | |
181 | return AVERROR(EINVAL); | |
182 | } | |
183 | s->map[i].in_channel_idx = in_ch_idx; | |
184 | s->map[i].out_channel_idx = i; | |
185 | break; | |
186 | case MAP_ONE_STR: | |
187 | if (get_channel(&mapping, &in_ch, separator) < 0) { | |
188 | av_log(ctx, AV_LOG_ERROR, err); | |
189 | return AVERROR(EINVAL); | |
190 | } | |
191 | s->map[i].in_channel = in_ch; | |
192 | s->map[i].out_channel_idx = i; | |
193 | break; | |
194 | case MAP_PAIR_INT_INT: | |
195 | if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 || | |
196 | get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) { | |
197 | av_log(ctx, AV_LOG_ERROR, err); | |
198 | return AVERROR(EINVAL); | |
199 | } | |
200 | s->map[i].in_channel_idx = in_ch_idx; | |
201 | s->map[i].out_channel_idx = out_ch_idx; | |
202 | break; | |
203 | case MAP_PAIR_INT_STR: | |
204 | if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 || | |
205 | get_channel(&mapping, &out_ch, separator) < 0 || | |
206 | out_ch & out_ch_mask) { | |
207 | av_log(ctx, AV_LOG_ERROR, err); | |
208 | return AVERROR(EINVAL); | |
209 | } | |
210 | s->map[i].in_channel_idx = in_ch_idx; | |
211 | s->map[i].out_channel = out_ch; | |
212 | out_ch_mask |= out_ch; | |
213 | break; | |
214 | case MAP_PAIR_STR_INT: | |
215 | if (get_channel(&mapping, &in_ch, '-') < 0 || | |
216 | get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) { | |
217 | av_log(ctx, AV_LOG_ERROR, err); | |
218 | return AVERROR(EINVAL); | |
219 | } | |
220 | s->map[i].in_channel = in_ch; | |
221 | s->map[i].out_channel_idx = out_ch_idx; | |
222 | break; | |
223 | case MAP_PAIR_STR_STR: | |
224 | if (get_channel(&mapping, &in_ch, '-') < 0 || | |
225 | get_channel(&mapping, &out_ch, separator) < 0 || | |
226 | out_ch & out_ch_mask) { | |
227 | av_log(ctx, AV_LOG_ERROR, err); | |
228 | return AVERROR(EINVAL); | |
229 | } | |
230 | s->map[i].in_channel = in_ch; | |
231 | s->map[i].out_channel = out_ch; | |
232 | out_ch_mask |= out_ch; | |
233 | break; | |
234 | } | |
235 | } | |
236 | s->mode = mode; | |
237 | s->nch = map_entries; | |
238 | s->output_layout = out_ch_mask ? out_ch_mask : | |
239 | av_get_default_channel_layout(map_entries); | |
240 | ||
241 | if (s->channel_layout_str) { | |
242 | uint64_t fmt; | |
243 | if ((fmt = av_get_channel_layout(s->channel_layout_str)) == 0) { | |
244 | av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout: '%s'.\n", | |
245 | s->channel_layout_str); | |
246 | return AVERROR(EINVAL); | |
247 | } | |
248 | if (mode == MAP_NONE) { | |
249 | int i; | |
250 | s->nch = av_get_channel_layout_nb_channels(fmt); | |
251 | for (i = 0; i < s->nch; i++) { | |
252 | s->map[i].in_channel_idx = i; | |
253 | s->map[i].out_channel_idx = i; | |
254 | } | |
255 | } else if (out_ch_mask && out_ch_mask != fmt) { | |
256 | av_get_channel_layout_string(buf, sizeof(buf), 0, out_ch_mask); | |
257 | av_log(ctx, AV_LOG_ERROR, | |
258 | "Output channel layout '%s' does not match the list of channel mapped: '%s'.\n", | |
259 | s->channel_layout_str, buf); | |
260 | return AVERROR(EINVAL); | |
261 | } else if (s->nch != av_get_channel_layout_nb_channels(fmt)) { | |
262 | av_log(ctx, AV_LOG_ERROR, | |
263 | "Output channel layout %s does not match the number of channels mapped %d.\n", | |
264 | s->channel_layout_str, s->nch); | |
265 | return AVERROR(EINVAL); | |
266 | } | |
267 | s->output_layout = fmt; | |
268 | } | |
269 | if (!s->output_layout) { | |
270 | av_log(ctx, AV_LOG_ERROR, "Output channel layout is not set and " | |
271 | "cannot be guessed from the maps.\n"); | |
272 | return AVERROR(EINVAL); | |
273 | } | |
274 | ||
275 | ff_add_channel_layout(&s->channel_layouts, s->output_layout); | |
276 | ||
277 | if (mode == MAP_PAIR_INT_STR || mode == MAP_PAIR_STR_STR) { | |
278 | for (i = 0; i < s->nch; i++) { | |
279 | s->map[i].out_channel_idx = av_get_channel_layout_channel_index( | |
280 | s->output_layout, s->map[i].out_channel); | |
281 | } | |
282 | } | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | static int channelmap_query_formats(AVFilterContext *ctx) | |
288 | { | |
289 | ChannelMapContext *s = ctx->priv; | |
f6fa7814 | 290 | AVFilterChannelLayouts *layouts; |
2ba45a60 DM |
291 | |
292 | ff_set_common_formats(ctx, ff_planar_sample_fmts()); | |
293 | ff_set_common_samplerates(ctx, ff_all_samplerates()); | |
f6fa7814 DM |
294 | |
295 | layouts = ff_all_channel_layouts(); | |
296 | if (!layouts) | |
297 | return AVERROR(ENOMEM); | |
298 | ||
299 | ff_channel_layouts_ref(layouts, &ctx->inputs[0]->out_channel_layouts); | |
2ba45a60 DM |
300 | ff_channel_layouts_ref(s->channel_layouts, &ctx->outputs[0]->in_channel_layouts); |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static int channelmap_filter_frame(AVFilterLink *inlink, AVFrame *buf) | |
306 | { | |
307 | AVFilterContext *ctx = inlink->dst; | |
308 | AVFilterLink *outlink = ctx->outputs[0]; | |
309 | const ChannelMapContext *s = ctx->priv; | |
310 | const int nch_in = av_get_channel_layout_nb_channels(inlink->channel_layout); | |
311 | const int nch_out = s->nch; | |
312 | int ch; | |
313 | uint8_t *source_planes[MAX_CH]; | |
314 | ||
315 | memcpy(source_planes, buf->extended_data, | |
316 | nch_in * sizeof(source_planes[0])); | |
317 | ||
318 | if (nch_out > nch_in) { | |
319 | if (nch_out > FF_ARRAY_ELEMS(buf->data)) { | |
320 | uint8_t **new_extended_data = | |
321 | av_mallocz_array(nch_out, sizeof(*buf->extended_data)); | |
322 | if (!new_extended_data) { | |
323 | av_frame_free(&buf); | |
324 | return AVERROR(ENOMEM); | |
325 | } | |
326 | if (buf->extended_data == buf->data) { | |
327 | buf->extended_data = new_extended_data; | |
328 | } else { | |
329 | av_free(buf->extended_data); | |
330 | buf->extended_data = new_extended_data; | |
331 | } | |
332 | } else if (buf->extended_data != buf->data) { | |
333 | av_free(buf->extended_data); | |
334 | buf->extended_data = buf->data; | |
335 | } | |
336 | } | |
337 | ||
338 | for (ch = 0; ch < nch_out; ch++) { | |
339 | buf->extended_data[s->map[ch].out_channel_idx] = | |
340 | source_planes[s->map[ch].in_channel_idx]; | |
341 | } | |
342 | ||
343 | if (buf->data != buf->extended_data) | |
344 | memcpy(buf->data, buf->extended_data, | |
345 | FFMIN(FF_ARRAY_ELEMS(buf->data), nch_out) * sizeof(buf->data[0])); | |
346 | ||
347 | buf->channel_layout = outlink->channel_layout; | |
348 | ||
349 | return ff_filter_frame(outlink, buf); | |
350 | } | |
351 | ||
352 | static int channelmap_config_input(AVFilterLink *inlink) | |
353 | { | |
354 | AVFilterContext *ctx = inlink->dst; | |
355 | ChannelMapContext *s = ctx->priv; | |
356 | int nb_channels = av_get_channel_layout_nb_channels(inlink->channel_layout); | |
357 | int i, err = 0; | |
358 | const char *channel_name; | |
359 | char layout_name[256]; | |
360 | ||
361 | for (i = 0; i < s->nch; i++) { | |
362 | struct ChannelMap *m = &s->map[i]; | |
363 | ||
364 | if (s->mode == MAP_PAIR_STR_INT || s->mode == MAP_PAIR_STR_STR) { | |
365 | m->in_channel_idx = av_get_channel_layout_channel_index( | |
366 | inlink->channel_layout, m->in_channel); | |
367 | } | |
368 | ||
369 | if (m->in_channel_idx < 0 || m->in_channel_idx >= nb_channels) { | |
370 | av_get_channel_layout_string(layout_name, sizeof(layout_name), | |
371 | 0, inlink->channel_layout); | |
372 | if (m->in_channel) { | |
373 | channel_name = av_get_channel_name(m->in_channel); | |
374 | av_log(ctx, AV_LOG_ERROR, | |
375 | "input channel '%s' not available from input layout '%s'\n", | |
376 | channel_name, layout_name); | |
377 | } else { | |
378 | av_log(ctx, AV_LOG_ERROR, | |
379 | "input channel #%d not available from input layout '%s'\n", | |
380 | m->in_channel_idx, layout_name); | |
381 | } | |
382 | err = AVERROR(EINVAL); | |
383 | } | |
384 | } | |
385 | ||
386 | return err; | |
387 | } | |
388 | ||
389 | static const AVFilterPad avfilter_af_channelmap_inputs[] = { | |
390 | { | |
391 | .name = "default", | |
392 | .type = AVMEDIA_TYPE_AUDIO, | |
393 | .filter_frame = channelmap_filter_frame, | |
394 | .config_props = channelmap_config_input, | |
395 | .needs_writable = 1, | |
396 | }, | |
397 | { NULL } | |
398 | }; | |
399 | ||
400 | static const AVFilterPad avfilter_af_channelmap_outputs[] = { | |
401 | { | |
402 | .name = "default", | |
403 | .type = AVMEDIA_TYPE_AUDIO | |
404 | }, | |
405 | { NULL } | |
406 | }; | |
407 | ||
408 | AVFilter ff_af_channelmap = { | |
409 | .name = "channelmap", | |
410 | .description = NULL_IF_CONFIG_SMALL("Remap audio channels."), | |
411 | .init = channelmap_init, | |
412 | .query_formats = channelmap_query_formats, | |
413 | .priv_size = sizeof(ChannelMapContext), | |
414 | .priv_class = &channelmap_class, | |
415 | .inputs = avfilter_af_channelmap_inputs, | |
416 | .outputs = avfilter_af_channelmap_outputs, | |
417 | }; |