libavfilter/f_streamselect.c

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include "libavutil/avstring.h"
  20 #include "libavutil/internal.h"
  21 #include "libavutil/mem.h"
  22 #include "libavutil/opt.h"
  23 #include "avfilter.h"
  24 #include "audio.h"
  25 #include "filters.h"
  26 #include "formats.h"
  27 #include "framesync.h"
  28 #include "video.h"
  29
  30 typedef struct StreamSelectContext {
  31     const AVClass *class;
  32     int nb_inputs;
  33     char *map_str;
  34     int *map;
  35     int nb_map;
  36     int is_audio;
  37     int64_t *last_pts;
  38     AVFrame **frames;
  39     FFFrameSync fs;
  40 } StreamSelectContext;
  41
  42 #define OFFSET(x) offsetof(StreamSelectContext, x)
  43 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
  44 #define TFLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_RUNTIME_PARAM
  45 static const AVOption streamselect_options[] = {
  46     { "inputs",  "number of input streams",           OFFSET(nb_inputs),  AV_OPT_TYPE_INT,    {.i64=2},    2, INT_MAX,  .flags=FLAGS },
  47     { "map",     "input indexes to remap to outputs", OFFSET(map_str),    AV_OPT_TYPE_STRING, {.str=NULL},              .flags=TFLAGS },
  48     { NULL }
  49 };
  50
  51 AVFILTER_DEFINE_CLASS_EXT(streamselect, "(a)streamselect", streamselect_options);
  52
  53 static int process_frame(FFFrameSync *fs)
  54 {
  55     AVFilterContext *ctx = fs->parent;
  56     StreamSelectContext *s = fs->opaque;
  57     AVFrame **in = s->frames;
  58     int i, j, ret = 0, have_out = 0;
  59
  60     for (i = 0; i < ctx->nb_inputs; i++) {
  61         if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0)
  62             return ret;
  63     }
  64
  65     for (j = 0; j < ctx->nb_inputs; j++) {
  66         for (i = 0; i < s->nb_map; i++) {
  67             FilterLink *outl = ff_filter_link(ctx->outputs[i]);
  68             if (s->map[i] == j) {
  69                 AVFrame *out;
  70
  71                 if (s->is_audio && s->last_pts[j] == in[j]->pts &&
  72                     outl->frame_count_in > 0)
  73                     continue;
  74                 out = av_frame_clone(in[j]);
  75                 if (!out)
  76                     return AVERROR(ENOMEM);
  77
  78                 out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, ctx->outputs[i]->time_base);
  79                 s->last_pts[j] = in[j]->pts;
  80                 ret = ff_filter_frame(ctx->outputs[i], out);
  81                 have_out = 1;
  82                 if (ret < 0)
  83                     return ret;
  84             }
  85         }
  86     }
  87
  88     if (!have_out)
  89         ff_filter_set_ready(ctx, 100);
  90     return ret;
  91 }
  92
  93 static int activate(AVFilterContext *ctx)
  94 {
  95     StreamSelectContext *s = ctx->priv;
  96     return ff_framesync_activate(&s->fs);
  97 }
  98
  99 static int config_output(AVFilterLink *outlink)
 100 {
 101     FilterLink *outl     = ff_filter_link(outlink);
 102     AVFilterContext *ctx = outlink->src;
 103     StreamSelectContext *s = ctx->priv;
 104     const int outlink_idx = FF_OUTLINK_IDX(outlink);
 105     const int inlink_idx  = s->map[outlink_idx];
 106     AVFilterLink *inlink = ctx->inputs[inlink_idx];
 107     FilterLink      *inl = ff_filter_link(inlink);
 108     FFFrameSyncIn *in;
 109     int i, ret;
 110
 111     av_log(ctx, AV_LOG_VERBOSE, "config output link %d "
 112            "with settings from input link %d\n",
 113            outlink_idx, inlink_idx);
 114
 115     switch (outlink->type) {
 116     case AVMEDIA_TYPE_VIDEO:
 117         outlink->w = inlink->w;
 118         outlink->h = inlink->h;
 119         outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
 120         outl->frame_rate = inl->frame_rate;
 121         break;
 122     case AVMEDIA_TYPE_AUDIO:
 123         outlink->sample_rate    = inlink->sample_rate;
 124         outlink->ch_layout.nb_channels       = inlink->ch_layout.nb_channels;
 125         break;
 126     }
 127
 128     outlink->time_base = inlink->time_base;
 129     outlink->format = inlink->format;
 130
 131     if (s->fs.opaque == s)
 132         return 0;
 133
 134     if ((ret = ff_framesync_init(&s->fs, ctx, ctx->nb_inputs)) < 0)
 135         return ret;
 136
 137     in = s->fs.in;
 138     s->fs.opaque = s;
 139     s->fs.on_event = process_frame;
 140
 141     for (i = 0; i < ctx->nb_inputs; i++) {
 142         in[i].time_base = ctx->inputs[i]->time_base;
 143         in[i].sync      = 1;
 144         in[i].before    = EXT_STOP;
 145         in[i].after     = EXT_STOP;
 146     }
 147
 148     s->frames = av_calloc(ctx->nb_inputs, sizeof(*s->frames));
 149     if (!s->frames)
 150         return AVERROR(ENOMEM);
 151
 152     return ff_framesync_configure(&s->fs);
 153 }
 154
 155 static int parse_definition(AVFilterContext *ctx, int nb_pads, int is_input, int is_audio)
 156 {
 157     const char *padtype = is_input ? "in" : "out";
 158     int i = 0, ret = 0;
 159
 160     for (i = 0; i < nb_pads; i++) {
 161         AVFilterPad pad = { 0 };
 162
 163         pad.type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
 164
 165         pad.name = av_asprintf("%sput%d", padtype, i);
 166         if (!pad.name)
 167             return AVERROR(ENOMEM);
 168
 169         av_log(ctx, AV_LOG_DEBUG, "Add %s pad %s\n", padtype, pad.name);
 170
 171         if (is_input) {
 172             ret = ff_append_inpad_free_name(ctx, &pad);
 173         } else {
 174             pad.config_props  = config_output;
 175             ret = ff_append_outpad_free_name(ctx, &pad);
 176         }
 177         if (ret < 0)
 178             return ret;
 179     }
 180
 181     return 0;
 182 }
 183
 184 static int parse_mapping(AVFilterContext *ctx, const char *map)
 185 {
 186     StreamSelectContext *s = ctx->priv;
 187     int *new_map;
 188     int new_nb_map = 0;
 189
 190     if (!map) {
 191         av_log(ctx, AV_LOG_ERROR, "mapping definition is not set\n");
 192         return AVERROR(EINVAL);
 193     }
 194
 195     new_map = av_calloc(s->nb_inputs, sizeof(*new_map));
 196     if (!new_map)
 197         return AVERROR(ENOMEM);
 198
 199     while (1) {
 200         char *p;
 201         const int n = strtol(map, &p, 0);
 202
 203         av_log(ctx, AV_LOG_DEBUG, "n=%d map=%p p=%p\n", n, map, p);
 204
 205         if (map == p)
 206             break;
 207         map = p;
 208
 209         if (new_nb_map >= s->nb_inputs) {
 210             av_log(ctx, AV_LOG_ERROR, "Unable to map more than the %d "
 211                    "input pads available\n", s->nb_inputs);
 212             av_free(new_map);
 213             return AVERROR(EINVAL);
 214         }
 215
 216         if (n < 0 || n >= ctx->nb_inputs) {
 217             av_log(ctx, AV_LOG_ERROR, "Input stream index %d doesn't exist "
 218                    "(there is only %d input streams defined)\n",
 219                    n, s->nb_inputs);
 220             av_free(new_map);
 221             return AVERROR(EINVAL);
 222         }
 223
 224         av_log(ctx, AV_LOG_VERBOSE, "Map input stream %d to output stream %d\n", n, new_nb_map);
 225         new_map[new_nb_map++] = n;
 226     }
 227
 228     if (!new_nb_map) {
 229         av_log(ctx, AV_LOG_ERROR, "invalid mapping\n");
 230         av_free(new_map);
 231         return AVERROR(EINVAL);
 232     }
 233
 234     av_freep(&s->map);
 235     s->map = new_map;
 236     s->nb_map = new_nb_map;
 237
 238     av_log(ctx, AV_LOG_VERBOSE, "%d map set\n", s->nb_map);
 239
 240     return 0;
 241 }
 242
 243 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
 244                            char *res, int res_len, int flags)
 245 {
 246     if (!strcmp(cmd, "map")) {
 247         int ret = parse_mapping(ctx, args);
 248
 249         if (ret < 0)
 250             return ret;
 251         return 0;
 252     }
 253     return AVERROR(ENOSYS);
 254 }
 255
 256 static av_cold int init(AVFilterContext *ctx)
 257 {
 258     StreamSelectContext *s = ctx->priv;
 259     int ret, nb_outputs = 0;
 260     char *map = s->map_str;
 261
 262     if (!strcmp(ctx->filter->name, "astreamselect"))
 263         s->is_audio = 1;
 264
 265     for (; map;) {
 266         char *p;
 267
 268         strtol(map, &p, 0);
 269         if (map == p)
 270             break;
 271         nb_outputs++;
 272         map = p;
 273     }
 274
 275     s->last_pts = av_calloc(s->nb_inputs, sizeof(*s->last_pts));
 276     if (!s->last_pts)
 277         return AVERROR(ENOMEM);
 278
 279     if ((ret = parse_definition(ctx, s->nb_inputs, 1, s->is_audio)) < 0 ||
 280         (ret = parse_definition(ctx, nb_outputs, 0, s->is_audio)) < 0)
 281         return ret;
 282
 283     av_log(ctx, AV_LOG_DEBUG, "Configured with %d inpad and %d outpad\n",
 284            ctx->nb_inputs, ctx->nb_outputs);
 285
 286     return parse_mapping(ctx, s->map_str);
 287 }
 288
 289 static av_cold void uninit(AVFilterContext *ctx)
 290 {
 291     StreamSelectContext *s = ctx->priv;
 292
 293     av_freep(&s->last_pts);
 294     av_freep(&s->map);
 295     av_freep(&s->frames);
 296     ff_framesync_uninit(&s->fs);
 297 }
 298
 299 const FFFilter ff_vf_streamselect = {
 300     .p.name          = "streamselect",
 301     .p.description   = NULL_IF_CONFIG_SMALL("Select video streams"),
 302     .p.priv_class    = &streamselect_class,
 303     .p.flags         = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS,
 304     .init            = init,
 305     .process_command = process_command,
 306     .uninit          = uninit,
 307     .activate        = activate,
 308     .priv_size       = sizeof(StreamSelectContext),
 309 };
 310
 311 const FFFilter ff_af_astreamselect = {
 312     .p.name          = "astreamselect",
 313     .p.description   = NULL_IF_CONFIG_SMALL("Select audio streams"),
 314     .p.priv_class    = &streamselect_class,
 315     .p.flags         = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS,
 316     .init            = init,
 317     .process_command = process_command,
 318     .uninit          = uninit,
 319     .activate        = activate,
 320     .priv_size       = sizeof(StreamSelectContext),
 321 };