FFmpeg: libavdevice/lavfi.c Source File

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libavdevice

lavfi.c

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1 /*

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 */

21 /**

22 * @file

23 * libavfilter virtual input device

24 */

26 /* #define DEBUG */

28 #include <float.h> /* DBL_MIN, DBL_MAX */

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"

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;

57 static int *create_all_formats(int n)

58 {

59 int i, j, *fmts, count = 0;

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 }

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 }

78 av_cold static int lavfi_read_close(AVFormatContext *avctx)

79 {

80 LavfiContext *lavfi = avctx->priv_data;

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);

89 return 0;

90 }

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 uint8_t *file_buf, *graph_buf;

119 size_t file_bufsize;

120 ret = av_file_map(lavfi->graph_filename,

121 &file_buf, &file_bufsize, 0, avctx);

122 if (ret < 0)

123 goto end;

124

125 /* create a 0-terminated string based on the read file */

126 graph_buf = av_malloc(file_bufsize + 1);

127 if (!graph_buf) {

128 av_file_unmap(file_buf, file_bufsize);

129 FAIL(AVERROR(ENOMEM));

130 }

131 memcpy(graph_buf, file_buf, file_bufsize);

132 graph_buf[file_bufsize] = 0;

133 av_file_unmap(file_buf, file_bufsize);

134 lavfi->graph_str = graph_buf;

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 FAIL(ret);

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 /* is an audio or video output? */

188 type = inout->filter_ctx->output_pads[inout->pad_idx].type;

189 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {

190 av_log(avctx, AV_LOG_ERROR,

191 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);

192 FAIL(AVERROR(EINVAL));

193 }

194

195 if (lavfi->stream_sink_map[stream_idx] != -1) {

196 av_log(avctx, AV_LOG_ERROR,

197 "An output with stream index %d was already specified\n",

198 stream_idx);

199 FAIL(AVERROR(EINVAL));

200 }

201 lavfi->sink_stream_map[i] = stream_idx;

202 lavfi->stream_sink_map[stream_idx] = i;

203 }

204

205 /* for each open output create a corresponding stream */

206 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {

207 AVStream *st;

208 if (!(st = avformat_new_stream(avctx, NULL)))

209 FAIL(AVERROR(ENOMEM));

210 st->id = i;

211 }

212

213 /* create a sink for each output and connect them to the graph */

214 lavfi->sinks = av_malloc(sizeof(AVFilterContext *) * avctx->nb_streams);

215 if (!lavfi->sinks)

216 FAIL(AVERROR(ENOMEM));

217

218 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {

219 AVFilterContext *sink;

220

221 type = inout->filter_ctx->output_pads[inout->pad_idx].type;

222

223 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||

224 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {

225 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");

226 FAIL(AVERROR_FILTER_NOT_FOUND);

227 }

228

229 if (type == AVMEDIA_TYPE_VIDEO) {

230 ret = avfilter_graph_create_filter(&sink, buffersink,

231 inout->name, NULL,

232 NULL, lavfi->graph);

233 if (ret >= 0)

234 ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);

235 if (ret < 0)

236 goto end;

237 } else if (type == AVMEDIA_TYPE_AUDIO) {

238 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,

239 AV_SAMPLE_FMT_S16,

240 AV_SAMPLE_FMT_S32,

241 AV_SAMPLE_FMT_FLT,

242 AV_SAMPLE_FMT_DBL, -1 };

243

244 ret = avfilter_graph_create_filter(&sink, abuffersink,

245 inout->name, NULL,

246 NULL, lavfi->graph);

247 if (ret >= 0)

248 ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);

249 if (ret < 0)

250 goto end;

251 ret = av_opt_set_int(sink, "all_channel_counts", 1,

252 AV_OPT_SEARCH_CHILDREN);

253 if (ret < 0)

254 goto end;

255 }

256

257 lavfi->sinks[i] = sink;

258 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)

259 FAIL(ret);

260 }

261

262 /* configure the graph */

263 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)

264 FAIL(ret);

265

266 if (lavfi->dump_graph) {

267 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);

268 fputs(dump, stderr);

269 fflush(stderr);

270 av_free(dump);

271 }

272

273 /* fill each stream with the information in the corresponding sink */

274 for (i = 0; i < avctx->nb_streams; i++) {

275 AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];

276 AVStream *st = avctx->streams[i];

277 st->codec->codec_type = link->type;

278 avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);

279 if (link->type == AVMEDIA_TYPE_VIDEO) {

280 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;

281 st->codec->pix_fmt = link->format;

282 st->codec->time_base = link->time_base;

283 st->codec->width = link->w;

284 st->codec->height = link->h;

285 st ->sample_aspect_ratio =

286 st->codec->sample_aspect_ratio = link->sample_aspect_ratio;

287 avctx->probesize = FFMAX(avctx->probesize,

288 link->w * link->h *

289 av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) *

290 30);

291 } else if (link->type == AVMEDIA_TYPE_AUDIO) {

292 st->codec->codec_id = av_get_pcm_codec(link->format, -1);

293 st->codec->channels = avfilter_link_get_channels(link);

294 st->codec->sample_fmt = link->format;

295 st->codec->sample_rate = link->sample_rate;

296 st->codec->time_base = link->time_base;

297 st->codec->channel_layout = link->channel_layout;

298 if (st->codec->codec_id == AV_CODEC_ID_NONE)

299 av_log(avctx, AV_LOG_ERROR,

300 "Could not find PCM codec for sample format %s.\n",

301 av_get_sample_fmt_name(link->format));

302 }

303 }

304

305 if (!(lavfi->decoded_frame = av_frame_alloc()))

306 FAIL(AVERROR(ENOMEM));

307

308 end:

309 av_free(pix_fmts);

310 avfilter_inout_free(&input_links);

311 avfilter_inout_free(&output_links);

312 if (ret < 0)

313 lavfi_read_close(avctx);

314 return ret;

315 }

316

317 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)

318 {

319 LavfiContext *lavfi = avctx->priv_data;

320 double min_pts = DBL_MAX;

321 int stream_idx, min_pts_sink_idx = 0;

322 AVFrame *frame = lavfi->decoded_frame;

323 AVPicture pict;

324 AVDictionary *frame_metadata;

325 int ret, i;

326 int size = 0;

327

328 /* iterate through all the graph sinks. Select the sink with the

329 * minimum PTS */

330 for (i = 0; i < avctx->nb_streams; i++) {

331 AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;

332 double d;

333 int ret;

334

335 if (lavfi->sink_eof[i])

336 continue;

337

338 ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,

339 AV_BUFFERSINK_FLAG_PEEK);

340 if (ret == AVERROR_EOF) {

341 av_dlog(avctx, "EOF sink_idx:%d\n", i);

342 lavfi->sink_eof[i] = 1;

343 continue;

344 } else if (ret < 0)

345 return ret;

346 d = av_rescale_q(frame->pts, tb, AV_TIME_BASE_Q);

347 av_dlog(avctx, "sink_idx:%d time:%f\n", i, d);

348 av_frame_unref(frame);

349

350 if (d < min_pts) {

351 min_pts = d;

352 min_pts_sink_idx = i;

353 }

354 }

355 if (min_pts == DBL_MAX)

356 return AVERROR_EOF;

357

358 av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);

359

360 av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);

361 stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];

362

363 if (frame->width /* FIXME best way of testing a video */) {

364 size = avpicture_get_size(frame->format, frame->width, frame->height);

365 if ((ret = av_new_packet(pkt, size)) < 0)

366 return ret;

367

368 memcpy(pict.data, frame->data, 4*sizeof(frame->data[0]));

369 memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0]));

370

371 avpicture_layout(&pict, frame->format, frame->width, frame->height,

372 pkt->data, size);

373 } else if (av_frame_get_channels(frame) /* FIXME test audio */) {

374 size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *

375 av_frame_get_channels(frame);

376 if ((ret = av_new_packet(pkt, size)) < 0)

377 return ret;

378 memcpy(pkt->data, frame->data[0], size);

379 }

380

381 frame_metadata = av_frame_get_metadata(frame);

382 if (frame_metadata) {

383 uint8_t *metadata;

384 AVDictionaryEntry *e = NULL;

385 AVBPrint meta_buf;

386

387 av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);

388 while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {

389 av_bprintf(&meta_buf, "%s", e->key);

390 av_bprint_chars(&meta_buf, '0円', 1);

391 av_bprintf(&meta_buf, "%s", e->value);

392 av_bprint_chars(&meta_buf, '0円', 1);

393 }

394 if (!av_bprint_is_complete(&meta_buf) ||

395 !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,

396 meta_buf.len))) {

397 av_bprint_finalize(&meta_buf, NULL);

398 return AVERROR(ENOMEM);

399 }

400 memcpy(metadata, meta_buf.str, meta_buf.len);

401 av_bprint_finalize(&meta_buf, NULL);

402 }

403

404 pkt->stream_index = stream_idx;

405 pkt->pts = frame->pts;

406 pkt->pos = av_frame_get_pkt_pos(frame);

407 pkt->size = size;

408 av_frame_unref(frame);

409 return size;

410 }

411

412 #define OFFSET(x) offsetof(LavfiContext, x)

413

414 #define DEC AV_OPT_FLAG_DECODING_PARAM

415

416 static const AVOption options[] = {

417 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },

418 { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},

419 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },

420 { NULL },

421 };

422

423 static const AVClass lavfi_class = {

424 .class_name = "lavfi indev",

425 .item_name = av_default_item_name,

426 .option = options,

427 .version = LIBAVUTIL_VERSION_INT,

428 };

429

430 AVInputFormat ff_lavfi_demuxer = {

431 .name = "lavfi",

432 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),

433 .priv_data_size = sizeof(LavfiContext),

434 .read_header = lavfi_read_header,

435 .read_packet = lavfi_read_packet,

436 .read_close = lavfi_read_close,

437 .flags = AVFMT_NOFILE,

438 .priv_class = &lavfi_class,

439 };

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