2 * Copyright (c) 2011 Stefano Sabatini
4 * This file is part of FFmpeg.
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.
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.
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
23 * libavfilter virtual input device
28 #include <float.h> /* DBL_MIN, DBL_MAX */
29 #include <fcntl.h> /* O_RDONLY */
31 #include "libavutil/bprint.h"
32 #include "libavutil/channel_layout.h"
33 #include "libavutil/file.h"
34 #include "libavutil/log.h"
35 #include "libavutil/mem.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/parseutils.h"
38 #include "libavutil/pixdesc.h"
39 #include "libavfilter/avfilter.h"
40 #include "libavfilter/avfiltergraph.h"
41 #include "libavfilter/buffersink.h"
42 #include "libavformat/internal.h"
46 #include <unistd.h> /* close() */
53 AVClass *class; ///< class for private options
58 AVFilterContext **sinks;
62 AVFrame *decoded_frame;
65 static int *create_all_formats(int n)
67 int i, j, *fmts, count = 0;
69 for (i = 0; i < n; i++) {
70 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
71 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
75 if (!(fmts = av_malloc((count+1) * sizeof(int))))
77 for (j = 0, i = 0; i < n; i++) {
78 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
79 if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
86 av_cold static int lavfi_read_close(AVFormatContext *avctx)
88 LavfiContext *lavfi = avctx->priv_data;
90 av_freep(&lavfi->sink_stream_map);
91 av_freep(&lavfi->sink_eof);
92 av_freep(&lavfi->stream_sink_map);
93 av_freep(&lavfi->sinks);
94 avfilter_graph_free(&lavfi->graph);
95 av_frame_free(&lavfi->decoded_frame);
100 av_cold static int lavfi_read_header(AVFormatContext *avctx)
102 LavfiContext *lavfi = avctx->priv_data;
103 AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
104 AVFilter *buffersink, *abuffersink;
105 int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);
106 enum AVMediaType type;
109 #define FAIL(ERR) { ret = ERR; goto end; }
112 FAIL(AVERROR(ENOMEM));
114 avfilter_register_all();
116 buffersink = avfilter_get_by_name("buffersink");
117 abuffersink = avfilter_get_by_name("abuffersink");
119 if (lavfi->graph_filename && lavfi->graph_str) {
120 av_log(avctx, AV_LOG_ERROR,
121 "Only one of the graph or graph_file options must be specified\n");
122 FAIL(AVERROR(EINVAL));
125 if (lavfi->graph_filename) {
126 AVBPrint graph_file_pb;
127 int fd = avpriv_open(lavfi->graph_filename, O_RDONLY);
129 FAIL(AVERROR(EINVAL));
130 av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
131 ret = av_bprint_fd_contents(&graph_file_pb, fd);
132 av_bprint_chars(&graph_file_pb, '\0', 1);
134 if (!ret && !av_bprint_is_complete(&graph_file_pb))
135 ret = AVERROR(ENOMEM);
137 av_bprint_finalize(&graph_file_pb, NULL);
140 if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
144 if (!lavfi->graph_str)
145 lavfi->graph_str = av_strdup(avctx->filename);
147 /* parse the graph, create a stream for each open output */
148 if (!(lavfi->graph = avfilter_graph_alloc()))
149 FAIL(AVERROR(ENOMEM));
151 if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
152 &input_links, &output_links, avctx)) < 0)
156 av_log(avctx, AV_LOG_ERROR,
157 "Open inputs in the filtergraph are not acceptable\n");
158 FAIL(AVERROR(EINVAL));
161 /* count the outputs */
162 for (n = 0, inout = output_links; inout; n++, inout = inout->next);
164 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
165 FAIL(AVERROR(ENOMEM));
166 if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
167 FAIL(AVERROR(ENOMEM));
168 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
169 FAIL(AVERROR(ENOMEM));
171 for (i = 0; i < n; i++)
172 lavfi->stream_sink_map[i] = -1;
174 /* parse the output link names - they need to be of the form out0, out1, ...
175 * create a mapping between them and the streams */
176 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
178 if (!strcmp(inout->name, "out"))
180 else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) {
181 av_log(avctx, AV_LOG_ERROR,
182 "Invalid outpad name '%s'\n", inout->name);
183 FAIL(AVERROR(EINVAL));
186 if ((unsigned)stream_idx >= n) {
187 av_log(avctx, AV_LOG_ERROR,
188 "Invalid index was specified in output '%s', "
189 "must be a non-negative value < %d\n",
191 FAIL(AVERROR(EINVAL));
194 /* is an audio or video output? */
195 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
196 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
197 av_log(avctx, AV_LOG_ERROR,
198 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
199 FAIL(AVERROR(EINVAL));
202 if (lavfi->stream_sink_map[stream_idx] != -1) {
203 av_log(avctx, AV_LOG_ERROR,
204 "An output with stream index %d was already specified\n",
206 FAIL(AVERROR(EINVAL));
208 lavfi->sink_stream_map[i] = stream_idx;
209 lavfi->stream_sink_map[stream_idx] = i;
212 /* for each open output create a corresponding stream */
213 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
215 if (!(st = avformat_new_stream(avctx, NULL)))
216 FAIL(AVERROR(ENOMEM));
220 /* create a sink for each output and connect them to the graph */
221 lavfi->sinks = av_malloc_array(avctx->nb_streams, sizeof(AVFilterContext *));
223 FAIL(AVERROR(ENOMEM));
225 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
226 AVFilterContext *sink;
228 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
230 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
231 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
232 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
233 FAIL(AVERROR_FILTER_NOT_FOUND);
236 if (type == AVMEDIA_TYPE_VIDEO) {
237 ret = avfilter_graph_create_filter(&sink, buffersink,
241 ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
244 } else if (type == AVMEDIA_TYPE_AUDIO) {
245 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
249 AV_SAMPLE_FMT_DBL, -1 };
251 ret = avfilter_graph_create_filter(&sink, abuffersink,
255 ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
258 ret = av_opt_set_int(sink, "all_channel_counts", 1,
259 AV_OPT_SEARCH_CHILDREN);
264 lavfi->sinks[i] = sink;
265 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
269 /* configure the graph */
270 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
273 if (lavfi->dump_graph) {
274 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
280 /* fill each stream with the information in the corresponding sink */
281 for (i = 0; i < avctx->nb_streams; i++) {
282 AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
283 AVStream *st = avctx->streams[i];
284 st->codec->codec_type = link->type;
285 avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
286 if (link->type == AVMEDIA_TYPE_VIDEO) {
287 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
288 st->codec->pix_fmt = link->format;
289 st->codec->time_base = link->time_base;
290 st->codec->width = link->w;
291 st->codec->height = link->h;
292 st ->sample_aspect_ratio =
293 st->codec->sample_aspect_ratio = link->sample_aspect_ratio;
294 avctx->probesize = FFMAX(avctx->probesize,
296 av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) *
298 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
299 st->codec->codec_id = av_get_pcm_codec(link->format, -1);
300 st->codec->channels = avfilter_link_get_channels(link);
301 st->codec->sample_fmt = link->format;
302 st->codec->sample_rate = link->sample_rate;
303 st->codec->time_base = link->time_base;
304 st->codec->channel_layout = link->channel_layout;
305 if (st->codec->codec_id == AV_CODEC_ID_NONE)
306 av_log(avctx, AV_LOG_ERROR,
307 "Could not find PCM codec for sample format %s.\n",
308 av_get_sample_fmt_name(link->format));
312 if (!(lavfi->decoded_frame = av_frame_alloc()))
313 FAIL(AVERROR(ENOMEM));
317 avfilter_inout_free(&input_links);
318 avfilter_inout_free(&output_links);
320 lavfi_read_close(avctx);
324 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
326 LavfiContext *lavfi = avctx->priv_data;
327 double min_pts = DBL_MAX;
328 int stream_idx, min_pts_sink_idx = 0;
329 AVFrame *frame = lavfi->decoded_frame;
331 AVDictionary *frame_metadata;
335 /* iterate through all the graph sinks. Select the sink with the
337 for (i = 0; i < avctx->nb_streams; i++) {
338 AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;
342 if (lavfi->sink_eof[i])
345 ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
346 AV_BUFFERSINK_FLAG_PEEK);
347 if (ret == AVERROR_EOF) {
348 av_dlog(avctx, "EOF sink_idx:%d\n", i);
349 lavfi->sink_eof[i] = 1;
353 d = av_rescale_q(frame->pts, tb, AV_TIME_BASE_Q);
354 av_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
355 av_frame_unref(frame);
359 min_pts_sink_idx = i;
362 if (min_pts == DBL_MAX)
365 av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
367 av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
368 stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
370 if (frame->width /* FIXME best way of testing a video */) {
371 size = avpicture_get_size(frame->format, frame->width, frame->height);
372 if ((ret = av_new_packet(pkt, size)) < 0)
375 memcpy(pict.data, frame->data, 4*sizeof(frame->data[0]));
376 memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0]));
378 avpicture_layout(&pict, frame->format, frame->width, frame->height,
380 } else if (av_frame_get_channels(frame) /* FIXME test audio */) {
381 size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
382 av_frame_get_channels(frame);
383 if ((ret = av_new_packet(pkt, size)) < 0)
385 memcpy(pkt->data, frame->data[0], size);
388 frame_metadata = av_frame_get_metadata(frame);
389 if (frame_metadata) {
391 AVDictionaryEntry *e = NULL;
394 av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
395 while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
396 av_bprintf(&meta_buf, "%s", e->key);
397 av_bprint_chars(&meta_buf, '\0', 1);
398 av_bprintf(&meta_buf, "%s", e->value);
399 av_bprint_chars(&meta_buf, '\0', 1);
401 if (!av_bprint_is_complete(&meta_buf) ||
402 !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
404 av_bprint_finalize(&meta_buf, NULL);
405 return AVERROR(ENOMEM);
407 memcpy(metadata, meta_buf.str, meta_buf.len);
408 av_bprint_finalize(&meta_buf, NULL);
411 pkt->stream_index = stream_idx;
412 pkt->pts = frame->pts;
413 pkt->pos = av_frame_get_pkt_pos(frame);
415 av_frame_unref(frame);
419 #define OFFSET(x) offsetof(LavfiContext, x)
421 #define DEC AV_OPT_FLAG_DECODING_PARAM
423 static const AVOption options[] = {
424 { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
425 { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
426 { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
430 static const AVClass lavfi_class = {
431 .class_name = "lavfi indev",
432 .item_name = av_default_item_name,
434 .version = LIBAVUTIL_VERSION_INT,
435 .category = AV_CLASS_CATEGORY_DEVICE_INPUT,
438 AVInputFormat ff_lavfi_demuxer = {
440 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
441 .priv_data_size = sizeof(LavfiContext),
442 .read_header = lavfi_read_header,
443 .read_packet = lavfi_read_packet,
444 .read_close = lavfi_read_close,
445 .flags = AVFMT_NOFILE,
446 .priv_class = &lavfi_class,