| 1 | /* |
| 2 | * Copyright (c) 2011 Stefano Sabatini |
| 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 | * libavfilter virtual input device |
| 24 | */ |
| 25 | |
| 26 | /* #define DEBUG */ |
| 27 | |
| 28 | #include <float.h> /* DBL_MIN, DBL_MAX */ |
| 29 | |
| 30 | #include "libavutil/bprint.h" |
| 31 | #include "libavutil/channel_layout.h" |
| 32 | #include "libavutil/file.h" |
| 33 | #include "libavutil/log.h" |
| 34 | #include "libavutil/mem.h" |
| 35 | #include "libavutil/opt.h" |
| 36 | #include "libavutil/parseutils.h" |
| 37 | #include "libavutil/pixdesc.h" |
| 38 | #include "libavfilter/avfilter.h" |
| 39 | #include "libavfilter/avfiltergraph.h" |
| 40 | #include "libavfilter/buffersink.h" |
| 41 | #include "libavformat/internal.h" |
| 42 | #include "avdevice.h" |
| 43 | |
| 44 | typedef struct { |
| 45 | AVClass *class; ///< class for private options |
| 46 | char *graph_str; |
| 47 | char *graph_filename; |
| 48 | char *dump_graph; |
| 49 | AVFilterGraph *graph; |
| 50 | AVFilterContext **sinks; |
| 51 | int *sink_stream_map; |
| 52 | int *sink_eof; |
| 53 | int *stream_sink_map; |
| 54 | AVFrame *decoded_frame; |
| 55 | } LavfiContext; |
| 56 | |
| 57 | static int *create_all_formats(int n) |
| 58 | { |
| 59 | int i, j, *fmts, count = 0; |
| 60 | |
| 61 | for (i = 0; i < n; i++) { |
| 62 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i); |
| 63 | if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) |
| 64 | count++; |
| 65 | } |
| 66 | |
| 67 | if (!(fmts = av_malloc((count+1) * sizeof(int)))) |
| 68 | return NULL; |
| 69 | for (j = 0, i = 0; i < n; i++) { |
| 70 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i); |
| 71 | if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) |
| 72 | fmts[j++] = i; |
| 73 | } |
| 74 | fmts[j] = -1; |
| 75 | return fmts; |
| 76 | } |
| 77 | |
| 78 | av_cold static int lavfi_read_close(AVFormatContext *avctx) |
| 79 | { |
| 80 | LavfiContext *lavfi = avctx->priv_data; |
| 81 | |
| 82 | av_freep(&lavfi->sink_stream_map); |
| 83 | av_freep(&lavfi->sink_eof); |
| 84 | av_freep(&lavfi->stream_sink_map); |
| 85 | av_freep(&lavfi->sinks); |
| 86 | avfilter_graph_free(&lavfi->graph); |
| 87 | av_frame_free(&lavfi->decoded_frame); |
| 88 | |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | av_cold static int lavfi_read_header(AVFormatContext *avctx) |
| 93 | { |
| 94 | LavfiContext *lavfi = avctx->priv_data; |
| 95 | AVFilterInOut *input_links = NULL, *output_links = NULL, *inout; |
| 96 | AVFilter *buffersink, *abuffersink; |
| 97 | int *pix_fmts = create_all_formats(AV_PIX_FMT_NB); |
| 98 | enum AVMediaType type; |
| 99 | int ret = 0, i, n; |
| 100 | |
| 101 | #define FAIL(ERR) { ret = ERR; goto end; } |
| 102 | |
| 103 | if (!pix_fmts) |
| 104 | FAIL(AVERROR(ENOMEM)); |
| 105 | |
| 106 | avfilter_register_all(); |
| 107 | |
| 108 | buffersink = avfilter_get_by_name("buffersink"); |
| 109 | abuffersink = avfilter_get_by_name("abuffersink"); |
| 110 | |
| 111 | if (lavfi->graph_filename && lavfi->graph_str) { |
| 112 | av_log(avctx, AV_LOG_ERROR, |
| 113 | "Only one of the graph or graph_file options must be specified\n"); |
| 114 | FAIL(AVERROR(EINVAL)); |
| 115 | } |
| 116 | |
| 117 | if (lavfi->graph_filename) { |
| 118 | AVBPrint graph_file_pb; |
| 119 | AVIOContext *avio = NULL; |
| 120 | ret = avio_open(&avio, lavfi->graph_filename, AVIO_FLAG_READ); |
| 121 | if (ret < 0) |
| 122 | goto end; |
| 123 | av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED); |
| 124 | ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX); |
| 125 | avio_close(avio); |
| 126 | av_bprint_chars(&graph_file_pb, '\0', 1); |
| 127 | if (!ret && !av_bprint_is_complete(&graph_file_pb)) |
| 128 | ret = AVERROR(ENOMEM); |
| 129 | if (ret) { |
| 130 | av_bprint_finalize(&graph_file_pb, NULL); |
| 131 | goto end; |
| 132 | } |
| 133 | if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str))) |
| 134 | goto end; |
| 135 | } |
| 136 | |
| 137 | if (!lavfi->graph_str) |
| 138 | lavfi->graph_str = av_strdup(avctx->filename); |
| 139 | |
| 140 | /* parse the graph, create a stream for each open output */ |
| 141 | if (!(lavfi->graph = avfilter_graph_alloc())) |
| 142 | FAIL(AVERROR(ENOMEM)); |
| 143 | |
| 144 | if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str, |
| 145 | &input_links, &output_links, avctx)) < 0) |
| 146 | goto end; |
| 147 | |
| 148 | if (input_links) { |
| 149 | av_log(avctx, AV_LOG_ERROR, |
| 150 | "Open inputs in the filtergraph are not acceptable\n"); |
| 151 | FAIL(AVERROR(EINVAL)); |
| 152 | } |
| 153 | |
| 154 | /* count the outputs */ |
| 155 | for (n = 0, inout = output_links; inout; n++, inout = inout->next); |
| 156 | |
| 157 | if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n))) |
| 158 | FAIL(AVERROR(ENOMEM)); |
| 159 | if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n))) |
| 160 | FAIL(AVERROR(ENOMEM)); |
| 161 | if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n))) |
| 162 | FAIL(AVERROR(ENOMEM)); |
| 163 | |
| 164 | for (i = 0; i < n; i++) |
| 165 | lavfi->stream_sink_map[i] = -1; |
| 166 | |
| 167 | /* parse the output link names - they need to be of the form out0, out1, ... |
| 168 | * create a mapping between them and the streams */ |
| 169 | for (i = 0, inout = output_links; inout; i++, inout = inout->next) { |
| 170 | int stream_idx; |
| 171 | if (!strcmp(inout->name, "out")) |
| 172 | stream_idx = 0; |
| 173 | else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) { |
| 174 | av_log(avctx, AV_LOG_ERROR, |
| 175 | "Invalid outpad name '%s'\n", inout->name); |
| 176 | FAIL(AVERROR(EINVAL)); |
| 177 | } |
| 178 | |
| 179 | if ((unsigned)stream_idx >= n) { |
| 180 | av_log(avctx, AV_LOG_ERROR, |
| 181 | "Invalid index was specified in output '%s', " |
| 182 | "must be a non-negative value < %d\n", |
| 183 | inout->name, n); |
| 184 | FAIL(AVERROR(EINVAL)); |
| 185 | } |
| 186 | |
| 187 | if (lavfi->stream_sink_map[stream_idx] != -1) { |
| 188 | av_log(avctx, AV_LOG_ERROR, |
| 189 | "An output with stream index %d was already specified\n", |
| 190 | stream_idx); |
| 191 | FAIL(AVERROR(EINVAL)); |
| 192 | } |
| 193 | lavfi->sink_stream_map[i] = stream_idx; |
| 194 | lavfi->stream_sink_map[stream_idx] = i; |
| 195 | } |
| 196 | |
| 197 | /* for each open output create a corresponding stream */ |
| 198 | for (i = 0, inout = output_links; inout; i++, inout = inout->next) { |
| 199 | AVStream *st; |
| 200 | if (!(st = avformat_new_stream(avctx, NULL))) |
| 201 | FAIL(AVERROR(ENOMEM)); |
| 202 | st->id = i; |
| 203 | } |
| 204 | |
| 205 | /* create a sink for each output and connect them to the graph */ |
| 206 | lavfi->sinks = av_malloc_array(avctx->nb_streams, sizeof(AVFilterContext *)); |
| 207 | if (!lavfi->sinks) |
| 208 | FAIL(AVERROR(ENOMEM)); |
| 209 | |
| 210 | for (i = 0, inout = output_links; inout; i++, inout = inout->next) { |
| 211 | AVFilterContext *sink; |
| 212 | |
| 213 | type = inout->filter_ctx->output_pads[inout->pad_idx].type; |
| 214 | |
| 215 | if (type == AVMEDIA_TYPE_VIDEO && ! buffersink || |
| 216 | type == AVMEDIA_TYPE_AUDIO && ! abuffersink) { |
| 217 | av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n"); |
| 218 | FAIL(AVERROR_FILTER_NOT_FOUND); |
| 219 | } |
| 220 | |
| 221 | if (type == AVMEDIA_TYPE_VIDEO) { |
| 222 | ret = avfilter_graph_create_filter(&sink, buffersink, |
| 223 | inout->name, NULL, |
| 224 | NULL, lavfi->graph); |
| 225 | if (ret >= 0) |
| 226 | ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN); |
| 227 | if (ret < 0) |
| 228 | goto end; |
| 229 | } else if (type == AVMEDIA_TYPE_AUDIO) { |
| 230 | enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8, |
| 231 | AV_SAMPLE_FMT_S16, |
| 232 | AV_SAMPLE_FMT_S32, |
| 233 | AV_SAMPLE_FMT_FLT, |
| 234 | AV_SAMPLE_FMT_DBL, -1 }; |
| 235 | |
| 236 | ret = avfilter_graph_create_filter(&sink, abuffersink, |
| 237 | inout->name, NULL, |
| 238 | NULL, lavfi->graph); |
| 239 | if (ret >= 0) |
| 240 | ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN); |
| 241 | if (ret < 0) |
| 242 | goto end; |
| 243 | ret = av_opt_set_int(sink, "all_channel_counts", 1, |
| 244 | AV_OPT_SEARCH_CHILDREN); |
| 245 | if (ret < 0) |
| 246 | goto end; |
| 247 | } else { |
| 248 | av_log(avctx, AV_LOG_ERROR, |
| 249 | "Output '%s' is not a video or audio output, not yet supported\n", inout->name); |
| 250 | FAIL(AVERROR(EINVAL)); |
| 251 | } |
| 252 | |
| 253 | lavfi->sinks[i] = sink; |
| 254 | if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0) |
| 255 | goto end; |
| 256 | } |
| 257 | |
| 258 | /* configure the graph */ |
| 259 | if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0) |
| 260 | goto end; |
| 261 | |
| 262 | if (lavfi->dump_graph) { |
| 263 | char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph); |
| 264 | fputs(dump, stderr); |
| 265 | fflush(stderr); |
| 266 | av_free(dump); |
| 267 | } |
| 268 | |
| 269 | /* fill each stream with the information in the corresponding sink */ |
| 270 | for (i = 0; i < avctx->nb_streams; i++) { |
| 271 | AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0]; |
| 272 | AVStream *st = avctx->streams[i]; |
| 273 | st->codec->codec_type = link->type; |
| 274 | avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den); |
| 275 | if (link->type == AVMEDIA_TYPE_VIDEO) { |
| 276 | st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; |
| 277 | st->codec->pix_fmt = link->format; |
| 278 | st->codec->time_base = link->time_base; |
| 279 | st->codec->width = link->w; |
| 280 | st->codec->height = link->h; |
| 281 | st ->sample_aspect_ratio = |
| 282 | st->codec->sample_aspect_ratio = link->sample_aspect_ratio; |
| 283 | avctx->probesize = FFMAX(avctx->probesize, |
| 284 | link->w * link->h * |
| 285 | av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) * |
| 286 | 30); |
| 287 | } else if (link->type == AVMEDIA_TYPE_AUDIO) { |
| 288 | st->codec->codec_id = av_get_pcm_codec(link->format, -1); |
| 289 | st->codec->channels = avfilter_link_get_channels(link); |
| 290 | st->codec->sample_fmt = link->format; |
| 291 | st->codec->sample_rate = link->sample_rate; |
| 292 | st->codec->time_base = link->time_base; |
| 293 | st->codec->channel_layout = link->channel_layout; |
| 294 | if (st->codec->codec_id == AV_CODEC_ID_NONE) |
| 295 | av_log(avctx, AV_LOG_ERROR, |
| 296 | "Could not find PCM codec for sample format %s.\n", |
| 297 | av_get_sample_fmt_name(link->format)); |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | if (!(lavfi->decoded_frame = av_frame_alloc())) |
| 302 | FAIL(AVERROR(ENOMEM)); |
| 303 | |
| 304 | end: |
| 305 | av_free(pix_fmts); |
| 306 | avfilter_inout_free(&input_links); |
| 307 | avfilter_inout_free(&output_links); |
| 308 | if (ret < 0) |
| 309 | lavfi_read_close(avctx); |
| 310 | return ret; |
| 311 | } |
| 312 | |
| 313 | static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt) |
| 314 | { |
| 315 | LavfiContext *lavfi = avctx->priv_data; |
| 316 | double min_pts = DBL_MAX; |
| 317 | int stream_idx, min_pts_sink_idx = 0; |
| 318 | AVFrame *frame = lavfi->decoded_frame; |
| 319 | AVPicture pict; |
| 320 | AVDictionary *frame_metadata; |
| 321 | int ret, i; |
| 322 | int size = 0; |
| 323 | |
| 324 | /* iterate through all the graph sinks. Select the sink with the |
| 325 | * minimum PTS */ |
| 326 | for (i = 0; i < avctx->nb_streams; i++) { |
| 327 | AVRational tb = lavfi->sinks[i]->inputs[0]->time_base; |
| 328 | double d; |
| 329 | int ret; |
| 330 | |
| 331 | if (lavfi->sink_eof[i]) |
| 332 | continue; |
| 333 | |
| 334 | ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame, |
| 335 | AV_BUFFERSINK_FLAG_PEEK); |
| 336 | if (ret == AVERROR_EOF) { |
| 337 | av_dlog(avctx, "EOF sink_idx:%d\n", i); |
| 338 | lavfi->sink_eof[i] = 1; |
| 339 | continue; |
| 340 | } else if (ret < 0) |
| 341 | return ret; |
| 342 | d = av_rescale_q(frame->pts, tb, AV_TIME_BASE_Q); |
| 343 | av_dlog(avctx, "sink_idx:%d time:%f\n", i, d); |
| 344 | av_frame_unref(frame); |
| 345 | |
| 346 | if (d < min_pts) { |
| 347 | min_pts = d; |
| 348 | min_pts_sink_idx = i; |
| 349 | } |
| 350 | } |
| 351 | if (min_pts == DBL_MAX) |
| 352 | return AVERROR_EOF; |
| 353 | |
| 354 | av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx); |
| 355 | |
| 356 | av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0); |
| 357 | stream_idx = lavfi->sink_stream_map[min_pts_sink_idx]; |
| 358 | |
| 359 | if (frame->width /* FIXME best way of testing a video */) { |
| 360 | size = avpicture_get_size(frame->format, frame->width, frame->height); |
| 361 | if ((ret = av_new_packet(pkt, size)) < 0) |
| 362 | return ret; |
| 363 | |
| 364 | memcpy(pict.data, frame->data, 4*sizeof(frame->data[0])); |
| 365 | memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0])); |
| 366 | |
| 367 | avpicture_layout(&pict, frame->format, frame->width, frame->height, |
| 368 | pkt->data, size); |
| 369 | } else if (av_frame_get_channels(frame) /* FIXME test audio */) { |
| 370 | size = frame->nb_samples * av_get_bytes_per_sample(frame->format) * |
| 371 | av_frame_get_channels(frame); |
| 372 | if ((ret = av_new_packet(pkt, size)) < 0) |
| 373 | return ret; |
| 374 | memcpy(pkt->data, frame->data[0], size); |
| 375 | } |
| 376 | |
| 377 | frame_metadata = av_frame_get_metadata(frame); |
| 378 | if (frame_metadata) { |
| 379 | uint8_t *metadata; |
| 380 | AVDictionaryEntry *e = NULL; |
| 381 | AVBPrint meta_buf; |
| 382 | |
| 383 | av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
| 384 | while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) { |
| 385 | av_bprintf(&meta_buf, "%s", e->key); |
| 386 | av_bprint_chars(&meta_buf, '\0', 1); |
| 387 | av_bprintf(&meta_buf, "%s", e->value); |
| 388 | av_bprint_chars(&meta_buf, '\0', 1); |
| 389 | } |
| 390 | if (!av_bprint_is_complete(&meta_buf) || |
| 391 | !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA, |
| 392 | meta_buf.len))) { |
| 393 | av_bprint_finalize(&meta_buf, NULL); |
| 394 | return AVERROR(ENOMEM); |
| 395 | } |
| 396 | memcpy(metadata, meta_buf.str, meta_buf.len); |
| 397 | av_bprint_finalize(&meta_buf, NULL); |
| 398 | } |
| 399 | |
| 400 | pkt->stream_index = stream_idx; |
| 401 | pkt->pts = frame->pts; |
| 402 | pkt->pos = av_frame_get_pkt_pos(frame); |
| 403 | pkt->size = size; |
| 404 | av_frame_unref(frame); |
| 405 | return size; |
| 406 | } |
| 407 | |
| 408 | #define OFFSET(x) offsetof(LavfiContext, x) |
| 409 | |
| 410 | #define DEC AV_OPT_FLAG_DECODING_PARAM |
| 411 | |
| 412 | static const AVOption options[] = { |
| 413 | { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
| 414 | { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC}, |
| 415 | { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
| 416 | { NULL }, |
| 417 | }; |
| 418 | |
| 419 | static const AVClass lavfi_class = { |
| 420 | .class_name = "lavfi indev", |
| 421 | .item_name = av_default_item_name, |
| 422 | .option = options, |
| 423 | .version = LIBAVUTIL_VERSION_INT, |
| 424 | .category = AV_CLASS_CATEGORY_DEVICE_INPUT, |
| 425 | }; |
| 426 | |
| 427 | AVInputFormat ff_lavfi_demuxer = { |
| 428 | .name = "lavfi", |
| 429 | .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"), |
| 430 | .priv_data_size = sizeof(LavfiContext), |
| 431 | .read_header = lavfi_read_header, |
| 432 | .read_packet = lavfi_read_packet, |
| 433 | .read_close = lavfi_read_close, |
| 434 | .flags = AVFMT_NOFILE, |
| 435 | .priv_class = &lavfi_class, |
| 436 | }; |