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 */
30 #include "libavutil/log.h"
31 #include "libavutil/mem.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/parseutils.h"
34 #include "libavutil/pixdesc.h"
35 #include "libavutil/audioconvert.h"
36 #include "libavfilter/avfilter.h"
37 #include "libavfilter/avfiltergraph.h"
38 #include "libavfilter/buffersink.h"
39 #include "libavformat/internal.h"
43 AVClass *class; ///< class for private options
47 AVFilterContext **sinks;
52 static int *create_all_formats(int n)
54 int i, j, *fmts, count = 0;
56 for (i = 0; i < n; i++)
57 if (!(av_pix_fmt_descriptors[i].flags & PIX_FMT_HWACCEL))
60 if (!(fmts = av_malloc((count+1) * sizeof(int))))
62 for (j = 0, i = 0; i < n; i++) {
63 if (!(av_pix_fmt_descriptors[i].flags & PIX_FMT_HWACCEL))
70 av_cold static int lavfi_read_close(AVFormatContext *avctx)
72 LavfiContext *lavfi = avctx->priv_data;
74 av_freep(&lavfi->sink_stream_map);
75 av_freep(&lavfi->stream_sink_map);
76 av_freep(&lavfi->sinks);
77 avfilter_graph_free(&lavfi->graph);
82 av_cold static int lavfi_read_header(AVFormatContext *avctx)
84 LavfiContext *lavfi = avctx->priv_data;
85 AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
86 AVFilter *buffersink, *abuffersink;
87 int *pix_fmts = create_all_formats(PIX_FMT_NB);
88 enum AVMediaType type;
91 #define FAIL(ERR) { ret = ERR; goto end; }
94 FAIL(AVERROR(ENOMEM));
96 avfilter_register_all();
98 buffersink = avfilter_get_by_name("ffbuffersink");
99 abuffersink = avfilter_get_by_name("ffabuffersink");
101 if (!lavfi->graph_str)
102 lavfi->graph_str = av_strdup(avctx->filename);
104 /* parse the graph, create a stream for each open output */
105 if (!(lavfi->graph = avfilter_graph_alloc()))
106 FAIL(AVERROR(ENOMEM));
108 if ((ret = avfilter_graph_parse(lavfi->graph, lavfi->graph_str,
109 &input_links, &output_links, avctx)) < 0)
113 av_log(avctx, AV_LOG_ERROR,
114 "Open inputs in the filtergraph are not acceptable\n");
115 FAIL(AVERROR(EINVAL));
118 /* count the outputs */
119 for (n = 0, inout = output_links; inout; n++, inout = inout->next);
121 if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
122 FAIL(AVERROR(ENOMEM));
123 if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
124 FAIL(AVERROR(ENOMEM));
126 for (i = 0; i < n; i++)
127 lavfi->stream_sink_map[i] = -1;
129 /* parse the output link names - they need to be of the form out0, out1, ...
130 * create a mapping between them and the streams */
131 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
133 if (!strcmp(inout->name, "out"))
135 else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) {
136 av_log(avctx, AV_LOG_ERROR,
137 "Invalid outpad name '%s'\n", inout->name);
138 FAIL(AVERROR(EINVAL));
141 if ((unsigned)stream_idx >= n) {
142 av_log(avctx, AV_LOG_ERROR,
143 "Invalid index was specified in output '%s', "
144 "must be a non-negative value < %d\n",
146 FAIL(AVERROR(EINVAL));
149 /* is an audio or video output? */
150 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
151 if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
152 av_log(avctx, AV_LOG_ERROR,
153 "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
154 FAIL(AVERROR(EINVAL));
157 if (lavfi->stream_sink_map[stream_idx] != -1) {
158 av_log(avctx, AV_LOG_ERROR,
159 "An output with stream index %d was already specified\n",
161 FAIL(AVERROR(EINVAL));
163 lavfi->sink_stream_map[i] = stream_idx;
164 lavfi->stream_sink_map[stream_idx] = i;
167 /* for each open output create a corresponding stream */
168 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
170 if (!(st = avformat_new_stream(avctx, NULL)))
171 FAIL(AVERROR(ENOMEM));
175 /* create a sink for each output and connect them to the graph */
176 lavfi->sinks = av_malloc(sizeof(AVFilterContext *) * avctx->nb_streams);
178 FAIL(AVERROR(ENOMEM));
180 for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
181 AVFilterContext *sink;
183 type = inout->filter_ctx->output_pads[inout->pad_idx].type;
185 if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
186 type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
187 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
188 FAIL(AVERROR_FILTER_NOT_FOUND);
191 if (type == AVMEDIA_TYPE_VIDEO) {
192 AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
194 buffersink_params->pixel_fmts = pix_fmts;
195 ret = avfilter_graph_create_filter(&sink, buffersink,
197 buffersink_params, lavfi->graph);
198 av_freep(&buffersink_params);
202 } else if (type == AVMEDIA_TYPE_AUDIO) {
203 enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
207 AV_SAMPLE_FMT_DBL, -1 };
208 AVABufferSinkParams *abuffersink_params = av_abuffersink_params_alloc();
209 abuffersink_params->sample_fmts = sample_fmts;
211 ret = avfilter_graph_create_filter(&sink, abuffersink,
213 abuffersink_params, lavfi->graph);
214 av_free(abuffersink_params);
219 lavfi->sinks[i] = sink;
220 if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
224 /* configure the graph */
225 if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
228 if (lavfi->dump_graph) {
229 char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
235 /* fill each stream with the information in the corresponding sink */
236 for (i = 0; i < avctx->nb_streams; i++) {
237 AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
238 AVStream *st = avctx->streams[i];
239 st->codec->codec_type = link->type;
240 avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
241 if (link->type == AVMEDIA_TYPE_VIDEO) {
242 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
243 st->codec->pix_fmt = link->format;
244 st->codec->time_base = link->time_base;
245 st->codec->width = link->w;
246 st->codec->height = link->h;
247 st ->sample_aspect_ratio =
248 st->codec->sample_aspect_ratio = link->sample_aspect_ratio;
249 } else if (link->type == AVMEDIA_TYPE_AUDIO) {
250 st->codec->codec_id = av_get_pcm_codec(link->format, -1);
251 st->codec->channels = av_get_channel_layout_nb_channels(link->channel_layout);
252 st->codec->sample_fmt = link->format;
253 st->codec->sample_rate = link->sample_rate;
254 st->codec->time_base = link->time_base;
255 st->codec->channel_layout = link->channel_layout;
256 if (st->codec->codec_id == AV_CODEC_ID_NONE)
257 av_log(avctx, AV_LOG_ERROR,
258 "Could not find PCM codec for sample format %s.\n",
259 av_get_sample_fmt_name(link->format));
265 avfilter_inout_free(&input_links);
266 avfilter_inout_free(&output_links);
268 lavfi_read_close(avctx);
272 static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
274 LavfiContext *lavfi = avctx->priv_data;
275 double min_pts = DBL_MAX;
276 int stream_idx, min_pts_sink_idx = 0;
277 AVFilterBufferRef *ref;
282 /* iterate through all the graph sinks. Select the sink with the
284 for (i = 0; i < avctx->nb_streams; i++) {
285 AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;
287 int ret = av_buffersink_get_buffer_ref(lavfi->sinks[i],
288 &ref, AV_BUFFERSINK_FLAG_PEEK);
291 d = av_rescale_q(ref->pts, tb, AV_TIME_BASE_Q);
292 av_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
296 min_pts_sink_idx = i;
299 av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
301 av_buffersink_get_buffer_ref(lavfi->sinks[min_pts_sink_idx], &ref, 0);
302 stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
305 size = avpicture_get_size(ref->format, ref->video->w, ref->video->h);
306 if ((ret = av_new_packet(pkt, size)) < 0)
309 memcpy(pict.data, ref->data, 4*sizeof(ref->data[0]));
310 memcpy(pict.linesize, ref->linesize, 4*sizeof(ref->linesize[0]));
312 avpicture_layout(&pict, ref->format, ref->video->w,
313 ref->video->h, pkt->data, size);
314 } else if (ref->audio) {
315 size = ref->audio->nb_samples *
316 av_get_bytes_per_sample(ref->format) *
317 av_get_channel_layout_nb_channels(ref->audio->channel_layout);
318 if ((ret = av_new_packet(pkt, size)) < 0)
320 memcpy(pkt->data, ref->data[0], size);
323 pkt->stream_index = stream_idx;
327 avfilter_unref_buffer(ref);
332 #define OFFSET(x) offsetof(LavfiContext, x)
334 #define DEC AV_OPT_FLAG_DECODING_PARAM
336 static const AVOption options[] = {
337 { "graph", "Libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
338 { "dumpgraph", "Dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
342 static const AVClass lavfi_class = {
343 .class_name = "lavfi indev",
344 .item_name = av_default_item_name,
346 .version = LIBAVUTIL_VERSION_INT,
349 AVInputFormat ff_lavfi_demuxer = {
351 .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
352 .priv_data_size = sizeof(LavfiContext),
353 .read_header = lavfi_read_header,
354 .read_packet = lavfi_read_packet,
355 .read_close = lavfi_read_close,
356 .flags = AVFMT_NOFILE,
357 .priv_class = &lavfi_class,