git.sesse.net Git - ffmpeg/blob - libavfilter/avfiltergraph.c

   1 /*
   2  * filter graphs
   3  * Copyright (c) 2008 Vitor Sessak
   4  * Copyright (c) 2007 Bobby Bingham
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <ctype.h>
  24 #include <string.h>
  25
  26 #include "libavutil/audioconvert.h"
  27 #include "avfilter.h"
  28 #include "avfiltergraph.h"
  29 #include "internal.h"
  30
  31 AVFilterGraph *avfilter_graph_alloc(void)
  32 {
  33     return av_mallocz(sizeof(AVFilterGraph));
  34 }
  35
  36 void avfilter_graph_free(AVFilterGraph **graph)
  37 {
  38     if (!*graph)
  39         return;
  40     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
  41         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
  42     av_freep(&(*graph)->scale_sws_opts);
  43     av_freep(&(*graph)->filters);
  44     av_freep(graph);
  45 }
  46
  47 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
  48 {
  49     AVFilterContext **filters = av_realloc(graph->filters,
  50                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
  51     if (!filters)
  52         return AVERROR(ENOMEM);
  53
  54     graph->filters = filters;
  55     graph->filters[graph->filter_count++] = filter;
  56
  57     return 0;
  58 }
  59
  60 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
  61                                  const char *name, const char *args, void *opaque,
  62                                  AVFilterGraph *graph_ctx)
  63 {
  64     int ret;
  65
  66     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
  67         goto fail;
  68     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
  69         goto fail;
  70     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
  71         goto fail;
  72     return 0;
  73
  74 fail:
  75     if (*filt_ctx)
  76         avfilter_free(*filt_ctx);
  77     *filt_ctx = NULL;
  78     return ret;
  79 }
  80
  81 int ff_avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
  82 {
  83     AVFilterContext *filt;
  84     int i, j;
  85
  86     for (i = 0; i < graph->filter_count; i++) {
  87         filt = graph->filters[i];
  88
  89         for (j = 0; j < filt->input_count; j++) {
  90             if (!filt->inputs[j] || !filt->inputs[j]->src) {
  91                 av_log(log_ctx, AV_LOG_ERROR,
  92                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
  93                        filt->input_pads[j].name, filt->name, filt->filter->name);
  94                 return AVERROR(EINVAL);
  95             }
  96         }
  97
  98         for (j = 0; j < filt->output_count; j++) {
  99             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
 100                 av_log(log_ctx, AV_LOG_ERROR,
 101                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
 102                        filt->output_pads[j].name, filt->name, filt->filter->name);
 103                 return AVERROR(EINVAL);
 104             }
 105         }
 106     }
 107
 108     return 0;
 109 }
 110
 111 int ff_avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 112 {
 113     AVFilterContext *filt;
 114     int i, ret;
 115
 116     for (i=0; i < graph->filter_count; i++) {
 117         filt = graph->filters[i];
 118
 119         if (!filt->output_count) {
 120             if ((ret = avfilter_config_links(filt)))
 121                 return ret;
 122         }
 123     }
 124
 125     return 0;
 126 }
 127
 128 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 129 {
 130     int i;
 131
 132     for (i = 0; i < graph->filter_count; i++)
 133         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
 134             return graph->filters[i];
 135
 136     return NULL;
 137 }
 138
 139 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
 140                               const char *filt_name, const char *filt_args)
 141 {
 142     static int auto_count = 0, ret;
 143     char inst_name[32];
 144     AVFilterContext *filt_ctx;
 145
 146     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
 147             filt_name, auto_count++);
 148
 149     if ((ret = avfilter_graph_create_filter(&filt_ctx,
 150                                             avfilter_get_by_name(filt_name),
 151                                             inst_name, filt_args, NULL, graph)) < 0)
 152         return ret;
 153     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
 154         return ret;
 155
 156     filt_ctx->filter->query_formats(filt_ctx);
 157
 158     if ( ((link = filt_ctx-> inputs[0]) &&
 159            !avfilter_merge_formats(link->in_formats, link->out_formats)) ||
 160          ((link = filt_ctx->outputs[0]) &&
 161            !avfilter_merge_formats(link->in_formats, link->out_formats))
 162        ) {
 163         av_log(NULL, AV_LOG_ERROR,
 164                "Impossible to convert between the formats supported by the filter "
 165                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 166         return AVERROR(EINVAL);
 167     }
 168
 169     if (link->type == AVMEDIA_TYPE_AUDIO &&
 170          (((link = filt_ctx-> inputs[0]) &&
 171            (!avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts) ||
 172             !avfilter_merge_formats(link->in_packing,   link->out_packing))) ||
 173          ((link = filt_ctx->outputs[0]) &&
 174            (!avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts) ||
 175             !avfilter_merge_formats(link->in_packing,   link->out_packing))))
 176        ) {
 177         av_log(NULL, AV_LOG_ERROR,
 178                "Impossible to convert between the channel layouts/packing formats supported by the filter "
 179                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
 180         return AVERROR(EINVAL);
 181     }
 182
 183     return 0;
 184 }
 185
 186 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 187 {
 188     int i, j, ret;
 189     char filt_args[128];
 190
 191     /* ask all the sub-filters for their supported media formats */
 192     for (i = 0; i < graph->filter_count; i++) {
 193         if (graph->filters[i]->filter->query_formats)
 194             graph->filters[i]->filter->query_formats(graph->filters[i]);
 195         else
 196             avfilter_default_query_formats(graph->filters[i]);
 197     }
 198
 199     /* go through and merge as many format lists as possible */
 200     for (i = 0; i < graph->filter_count; i++) {
 201         AVFilterContext *filter = graph->filters[i];
 202
 203         for (j = 0; j < filter->input_count; j++) {
 204             AVFilterLink *link = filter->inputs[j];
 205             if (!link) continue;
 206
 207             if (!link->in_formats || !link->out_formats)
 208                 return AVERROR(EINVAL);
 209
 210             if (link->type == AVMEDIA_TYPE_VIDEO &&
 211                 !avfilter_merge_formats(link->in_formats, link->out_formats)) {
 212
 213                 /* couldn't merge format lists, auto-insert scale filter */
 214                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
 215                          graph->scale_sws_opts);
 216                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
 217                     return ret;
 218             }
 219             else if (link->type == AVMEDIA_TYPE_AUDIO) {
 220                 if (!link->in_chlayouts || !link->out_chlayouts ||
 221                     !link->in_packing   || !link->out_packing)
 222                     return AVERROR(EINVAL);
 223
 224                 if (!avfilter_merge_formats(link->in_formats,   link->out_formats)   ||
 225                     !avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts) ||
 226                     !avfilter_merge_formats(link->in_packing,   link->out_packing))
 227                     if (ret = insert_conv_filter(graph, link, "aconvert", NULL))
 228                        return ret;
 229             }
 230         }
 231     }
 232
 233     return 0;
 234 }
 235
 236 static void pick_format(AVFilterLink *link)
 237 {
 238     if (!link || !link->in_formats)
 239         return;
 240
 241     link->in_formats->format_count = 1;
 242     link->format = link->in_formats->formats[0];
 243     avfilter_formats_unref(&link->in_formats);
 244     avfilter_formats_unref(&link->out_formats);
 245
 246     if (link->type == AVMEDIA_TYPE_AUDIO) {
 247         link->in_chlayouts->format_count = 1;
 248         link->channel_layout = link->in_chlayouts->formats[0];
 249         avfilter_formats_unref(&link->in_chlayouts);
 250         avfilter_formats_unref(&link->out_chlayouts);
 251
 252         link->in_packing->format_count = 1;
 253         link->planar = link->in_packing->formats[0] == AVFILTER_PLANAR;
 254         avfilter_formats_unref(&link->in_packing);
 255         avfilter_formats_unref(&link->out_packing);
 256     }
 257 }
 258
 259 static void pick_formats(AVFilterGraph *graph)
 260 {
 261     int i, j;
 262
 263     for (i = 0; i < graph->filter_count; i++) {
 264         AVFilterContext *filter = graph->filters[i];
 265
 266         for (j = 0; j < filter->input_count; j++)
 267             pick_format(filter->inputs[j]);
 268         for (j = 0; j < filter->output_count; j++)
 269             pick_format(filter->outputs[j]);
 270     }
 271 }
 272
 273 int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 274 {
 275     int ret;
 276
 277     /* find supported formats from sub-filters, and merge along links */
 278     if ((ret = query_formats(graph, log_ctx)) < 0)
 279         return ret;
 280
 281     /* Once everything is merged, it's possible that we'll still have
 282      * multiple valid media format choices. We pick the first one. */
 283     pick_formats(graph);
 284
 285     return 0;
 286 }
 287
 288 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 289 {
 290     int ret;
 291
 292     if ((ret = ff_avfilter_graph_check_validity(graphctx, log_ctx)))
 293         return ret;
 294     if ((ret = ff_avfilter_graph_config_formats(graphctx, log_ctx)))
 295         return ret;
 296     if ((ret = ff_avfilter_graph_config_links(graphctx, log_ctx)))
 297         return ret;
 298
 299     return 0;
 300 }
 301
 302 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
 303 {
 304     int i, r = AVERROR(ENOSYS);
 305
 306     if(!graph)
 307         return r;
 308
 309     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
 310         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
 311         if(r != AVERROR(ENOSYS))
 312             return r;
 313     }
 314
 315     if(res_len && res)
 316         res[0]= 0;
 317
 318     for (i = 0; i < graph->filter_count; i++) {
 319         AVFilterContext *filter = graph->filters[i];
 320         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
 321             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
 322             if(r != AVERROR(ENOSYS)) {
 323                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
 324                     return r;
 325             }
 326         }
 327     }
 328
 329     return r;
 330 }
 331
 332 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
 333 {
 334     int i;
 335
 336     if(!graph)
 337         return 0;
 338
 339     for (i = 0; i < graph->filter_count; i++) {
 340         AVFilterContext *filter = graph->filters[i];
 341         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
 342             AVFilterCommand **que = &filter->command_queue, *next;
 343             while(*que && (*que)->time <= ts)
 344                 que = &(*que)->next;
 345             next= *que;
 346             *que= av_mallocz(sizeof(AVFilterCommand));
 347             (*que)->command = av_strdup(command);
 348             (*que)->arg     = av_strdup(arg);
 349             (*que)->time    = ts;
 350             (*que)->flags   = flags;
 351             (*que)->next    = next;
 352             if(flags & AVFILTER_CMD_FLAG_ONE)
 353                 return 0;
 354         }
 355     }
 356
 357     return 0;
 358 }