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path: root/libavfilter/af_channelmap.c (plain)
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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
40struct ChannelMap {
41 uint64_t in_channel;
42 uint64_t out_channel;
43 int in_channel_idx;
44 int out_channel_idx;
45};
46
47enum 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
58typedef struct ChannelMapContext {
59 const AVClass *class;
60 char *mapping_str;
61 char *channel_layout_str;
62 uint64_t output_layout;
63 struct ChannelMap map[MAX_CH];
64 int nch;
65 enum MappingMode mode;
66} ChannelMapContext;
67
68#define OFFSET(x) offsetof(ChannelMapContext, x)
69#define A AV_OPT_FLAG_AUDIO_PARAM
70#define F AV_OPT_FLAG_FILTERING_PARAM
71static const AVOption channelmap_options[] = {
72 { "map", "A comma-separated list of input channel numbers in output order.",
73 OFFSET(mapping_str), AV_OPT_TYPE_STRING, .flags = A|F },
74 { "channel_layout", "Output channel layout.",
75 OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A|F },
76 { NULL }
77};
78
79AVFILTER_DEFINE_CLASS(channelmap);
80
81static char* split(char *message, char delim) {
82 char *next = strchr(message, delim);
83 if (next)
84 *next++ = '\0';
85 return next;
86}
87
88static int get_channel_idx(char **map, int *ch, char delim, int max_ch)
89{
90 char *next;
91 int len;
92 int n = 0;
93 if (!*map)
94 return AVERROR(EINVAL);
95 next = split(*map, delim);
96 if (!next && delim == '-')
97 return AVERROR(EINVAL);
98 len = strlen(*map);
99 sscanf(*map, "%d%n", ch, &n);
100 if (n != len)
101 return AVERROR(EINVAL);
102 if (*ch < 0 || *ch > max_ch)
103 return AVERROR(EINVAL);
104 *map = next;
105 return 0;
106}
107
108static int get_channel(char **map, uint64_t *ch, char delim)
109{
110 char *next = split(*map, delim);
111 if (!next && delim == '-')
112 return AVERROR(EINVAL);
113 *ch = av_get_channel_layout(*map);
114 if (av_get_channel_layout_nb_channels(*ch) != 1)
115 return AVERROR(EINVAL);
116 *map = next;
117 return 0;
118}
119
120static av_cold int channelmap_init(AVFilterContext *ctx)
121{
122 ChannelMapContext *s = ctx->priv;
123 char *mapping, separator = '|';
124 int map_entries = 0;
125 char buf[256];
126 enum MappingMode mode;
127 uint64_t out_ch_mask = 0;
128 int i;
129
130 mapping = s->mapping_str;
131
132 if (!mapping) {
133 mode = MAP_NONE;
134 } else {
135 char *dash = strchr(mapping, '-');
136 if (!dash) { // short mapping
137 if (av_isdigit(*mapping))
138 mode = MAP_ONE_INT;
139 else
140 mode = MAP_ONE_STR;
141 } else if (av_isdigit(*mapping)) {
142 if (av_isdigit(*(dash+1)))
143 mode = MAP_PAIR_INT_INT;
144 else
145 mode = MAP_PAIR_INT_STR;
146 } else {
147 if (av_isdigit(*(dash+1)))
148 mode = MAP_PAIR_STR_INT;
149 else
150 mode = MAP_PAIR_STR_STR;
151 }
152#if FF_API_OLD_FILTER_OPTS
153 if (strchr(mapping, ',')) {
154 av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use "
155 "'|' to separate the mappings.\n");
156 separator = ',';
157 }
158#endif
159 }
160
161 if (mode != MAP_NONE) {
162 char *sep = mapping;
163 map_entries = 1;
164 while ((sep = strchr(sep, separator))) {
165 if (*++sep) // Allow trailing comma
166 map_entries++;
167 }
168 }
169
170 if (map_entries > MAX_CH) {
171 av_log(ctx, AV_LOG_ERROR, "Too many channels mapped: '%d'.\n", map_entries);
172 return AVERROR(EINVAL);
173 }
174
175 for (i = 0; i < map_entries; i++) {
176 int in_ch_idx = -1, out_ch_idx = -1;
177 uint64_t in_ch = 0, out_ch = 0;
178 static const char err[] = "Failed to parse channel map\n";
179 switch (mode) {
180 case MAP_ONE_INT:
181 if (get_channel_idx(&mapping, &in_ch_idx, separator, MAX_CH) < 0) {
182 av_log(ctx, AV_LOG_ERROR, err);
183 return AVERROR(EINVAL);
184 }
185 s->map[i].in_channel_idx = in_ch_idx;
186 s->map[i].out_channel_idx = i;
187 break;
188 case MAP_ONE_STR:
189 if (get_channel(&mapping, &in_ch, separator) < 0) {
190 av_log(ctx, AV_LOG_ERROR, err);
191 return AVERROR(EINVAL);
192 }
193 s->map[i].in_channel = in_ch;
194 s->map[i].out_channel_idx = i;
195 break;
196 case MAP_PAIR_INT_INT:
197 if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 ||
198 get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) {
199 av_log(ctx, AV_LOG_ERROR, err);
200 return AVERROR(EINVAL);
201 }
202 s->map[i].in_channel_idx = in_ch_idx;
203 s->map[i].out_channel_idx = out_ch_idx;
204 break;
205 case MAP_PAIR_INT_STR:
206 if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 ||
207 get_channel(&mapping, &out_ch, separator) < 0 ||
208 out_ch & out_ch_mask) {
209 av_log(ctx, AV_LOG_ERROR, err);
210 return AVERROR(EINVAL);
211 }
212 s->map[i].in_channel_idx = in_ch_idx;
213 s->map[i].out_channel = out_ch;
214 out_ch_mask |= out_ch;
215 break;
216 case MAP_PAIR_STR_INT:
217 if (get_channel(&mapping, &in_ch, '-') < 0 ||
218 get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) {
219 av_log(ctx, AV_LOG_ERROR, err);
220 return AVERROR(EINVAL);
221 }
222 s->map[i].in_channel = in_ch;
223 s->map[i].out_channel_idx = out_ch_idx;
224 break;
225 case MAP_PAIR_STR_STR:
226 if (get_channel(&mapping, &in_ch, '-') < 0 ||
227 get_channel(&mapping, &out_ch, separator) < 0 ||
228 out_ch & out_ch_mask) {
229 av_log(ctx, AV_LOG_ERROR, err);
230 return AVERROR(EINVAL);
231 }
232 s->map[i].in_channel = in_ch;
233 s->map[i].out_channel = out_ch;
234 out_ch_mask |= out_ch;
235 break;
236 }
237 }
238 s->mode = mode;
239 s->nch = map_entries;
240 s->output_layout = out_ch_mask ? out_ch_mask :
241 av_get_default_channel_layout(map_entries);
242
243 if (s->channel_layout_str) {
244 uint64_t fmt;
245 if ((fmt = av_get_channel_layout(s->channel_layout_str)) == 0) {
246 av_log(ctx, AV_LOG_ERROR, "Error parsing channel layout: '%s'.\n",
247 s->channel_layout_str);
248 return AVERROR(EINVAL);
249 }
250 if (mode == MAP_NONE) {
251 int i;
252 s->nch = av_get_channel_layout_nb_channels(fmt);
253 for (i = 0; i < s->nch; i++) {
254 s->map[i].in_channel_idx = i;
255 s->map[i].out_channel_idx = i;
256 }
257 } else if (out_ch_mask && out_ch_mask != fmt) {
258 av_get_channel_layout_string(buf, sizeof(buf), 0, out_ch_mask);
259 av_log(ctx, AV_LOG_ERROR,
260 "Output channel layout '%s' does not match the list of channel mapped: '%s'.\n",
261 s->channel_layout_str, buf);
262 return AVERROR(EINVAL);
263 } else if (s->nch != av_get_channel_layout_nb_channels(fmt)) {
264 av_log(ctx, AV_LOG_ERROR,
265 "Output channel layout %s does not match the number of channels mapped %d.\n",
266 s->channel_layout_str, s->nch);
267 return AVERROR(EINVAL);
268 }
269 s->output_layout = fmt;
270 }
271 if (!s->output_layout) {
272 av_log(ctx, AV_LOG_ERROR, "Output channel layout is not set and "
273 "cannot be guessed from the maps.\n");
274 return AVERROR(EINVAL);
275 }
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
287static int channelmap_query_formats(AVFilterContext *ctx)
288{
289 ChannelMapContext *s = ctx->priv;
290 AVFilterChannelLayouts *layouts;
291 AVFilterChannelLayouts *channel_layouts = NULL;
292 int ret;
293
294 layouts = ff_all_channel_counts();
295 if (!layouts) {
296 ret = AVERROR(ENOMEM);
297 goto fail;
298 }
299 if ((ret = ff_add_channel_layout (&channel_layouts, s->output_layout )) < 0 ||
300 (ret = ff_set_common_formats (ctx , ff_planar_sample_fmts() )) < 0 ||
301 (ret = ff_set_common_samplerates (ctx , ff_all_samplerates() )) < 0 ||
302 (ret = ff_channel_layouts_ref (layouts , &ctx->inputs[0]->out_channel_layouts)) < 0 ||
303 (ret = ff_channel_layouts_ref (channel_layouts , &ctx->outputs[0]->in_channel_layouts)) < 0)
304 goto fail;
305
306 return 0;
307fail:
308 if (layouts)
309 av_freep(&layouts->channel_layouts);
310 av_freep(&layouts);
311 return ret;
312}
313
314static int channelmap_filter_frame(AVFilterLink *inlink, AVFrame *buf)
315{
316 AVFilterContext *ctx = inlink->dst;
317 AVFilterLink *outlink = ctx->outputs[0];
318 const ChannelMapContext *s = ctx->priv;
319 const int nch_in = inlink->channels;
320 const int nch_out = s->nch;
321 int ch;
322 uint8_t *source_planes[MAX_CH];
323
324 memcpy(source_planes, buf->extended_data,
325 nch_in * sizeof(source_planes[0]));
326
327 if (nch_out > nch_in) {
328 if (nch_out > FF_ARRAY_ELEMS(buf->data)) {
329 uint8_t **new_extended_data =
330 av_mallocz_array(nch_out, sizeof(*buf->extended_data));
331 if (!new_extended_data) {
332 av_frame_free(&buf);
333 return AVERROR(ENOMEM);
334 }
335 if (buf->extended_data == buf->data) {
336 buf->extended_data = new_extended_data;
337 } else {
338 av_free(buf->extended_data);
339 buf->extended_data = new_extended_data;
340 }
341 } else if (buf->extended_data != buf->data) {
342 av_free(buf->extended_data);
343 buf->extended_data = buf->data;
344 }
345 }
346
347 for (ch = 0; ch < nch_out; ch++) {
348 buf->extended_data[s->map[ch].out_channel_idx] =
349 source_planes[s->map[ch].in_channel_idx];
350 }
351
352 if (buf->data != buf->extended_data)
353 memcpy(buf->data, buf->extended_data,
354 FFMIN(FF_ARRAY_ELEMS(buf->data), nch_out) * sizeof(buf->data[0]));
355
356 buf->channel_layout = outlink->channel_layout;
357 av_frame_set_channels(buf, outlink->channels);
358
359 return ff_filter_frame(outlink, buf);
360}
361
362static int channelmap_config_input(AVFilterLink *inlink)
363{
364 AVFilterContext *ctx = inlink->dst;
365 ChannelMapContext *s = ctx->priv;
366 int nb_channels = inlink->channels;
367 int i, err = 0;
368 const char *channel_name;
369 char layout_name[256];
370
371 for (i = 0; i < s->nch; i++) {
372 struct ChannelMap *m = &s->map[i];
373
374 if (s->mode == MAP_PAIR_STR_INT || s->mode == MAP_PAIR_STR_STR) {
375 m->in_channel_idx = av_get_channel_layout_channel_index(
376 inlink->channel_layout, m->in_channel);
377 }
378
379 if (m->in_channel_idx < 0 || m->in_channel_idx >= nb_channels) {
380 av_get_channel_layout_string(layout_name, sizeof(layout_name),
381 nb_channels, inlink->channel_layout);
382 if (m->in_channel) {
383 channel_name = av_get_channel_name(m->in_channel);
384 av_log(ctx, AV_LOG_ERROR,
385 "input channel '%s' not available from input layout '%s'\n",
386 channel_name, layout_name);
387 } else {
388 av_log(ctx, AV_LOG_ERROR,
389 "input channel #%d not available from input layout '%s'\n",
390 m->in_channel_idx, layout_name);
391 }
392 err = AVERROR(EINVAL);
393 }
394 }
395
396 return err;
397}
398
399static const AVFilterPad avfilter_af_channelmap_inputs[] = {
400 {
401 .name = "default",
402 .type = AVMEDIA_TYPE_AUDIO,
403 .filter_frame = channelmap_filter_frame,
404 .config_props = channelmap_config_input,
405 .needs_writable = 1,
406 },
407 { NULL }
408};
409
410static const AVFilterPad avfilter_af_channelmap_outputs[] = {
411 {
412 .name = "default",
413 .type = AVMEDIA_TYPE_AUDIO
414 },
415 { NULL }
416};
417
418AVFilter ff_af_channelmap = {
419 .name = "channelmap",
420 .description = NULL_IF_CONFIG_SMALL("Remap audio channels."),
421 .init = channelmap_init,
422 .query_formats = channelmap_query_formats,
423 .priv_size = sizeof(ChannelMapContext),
424 .priv_class = &channelmap_class,
425 .inputs = avfilter_af_channelmap_inputs,
426 .outputs = avfilter_af_channelmap_outputs,
427};
428
generated by cgit at 2024-05-17 05:13:22 (GMT)