LCOV - code coverage report
Current view: top level - libavdevice - lavfi.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 216 273 79.1 %
Date: 2017-10-24 00:14:43 Functions: 6 6 100.0 %

          Line data    Source code
       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/imgutils.h"
      34             : #include "libavutil/internal.h"
      35             : #include "libavutil/log.h"
      36             : #include "libavutil/mem.h"
      37             : #include "libavutil/opt.h"
      38             : #include "libavutil/parseutils.h"
      39             : #include "libavutil/pixdesc.h"
      40             : #include "libavfilter/avfilter.h"
      41             : #include "libavfilter/avfiltergraph.h"
      42             : #include "libavfilter/buffersink.h"
      43             : #include "libavformat/avio_internal.h"
      44             : #include "libavformat/internal.h"
      45             : #include "avdevice.h"
      46             : 
      47             : typedef struct {
      48             :     AVClass *class;          ///< class for private options
      49             :     char          *graph_str;
      50             :     char          *graph_filename;
      51             :     char          *dump_graph;
      52             :     AVFilterGraph *graph;
      53             :     AVFilterContext **sinks;
      54             :     int *sink_stream_map;
      55             :     int *sink_eof;
      56             :     int *stream_sink_map;
      57             :     int *sink_stream_subcc_map;
      58             :     AVFrame *decoded_frame;
      59             :     int nb_sinks;
      60             :     AVPacket subcc_packet;
      61             : } LavfiContext;
      62             : 
      63          18 : static int *create_all_formats(int n)
      64             : {
      65          18 :     int i, j, *fmts, count = 0;
      66             : 
      67        6444 :     for (i = 0; i < n; i++) {
      68        6426 :         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
      69        6426 :         if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
      70        6174 :             count++;
      71             :     }
      72             : 
      73          18 :     if (!(fmts = av_malloc((count+1) * sizeof(int))))
      74           0 :         return NULL;
      75        6444 :     for (j = 0, i = 0; i < n; i++) {
      76        6426 :         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
      77        6426 :         if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
      78        6174 :             fmts[j++] = i;
      79             :     }
      80          18 :     fmts[j] = -1;
      81          18 :     return fmts;
      82             : }
      83             : 
      84          18 : av_cold static int lavfi_read_close(AVFormatContext *avctx)
      85             : {
      86          18 :     LavfiContext *lavfi = avctx->priv_data;
      87             : 
      88          18 :     av_freep(&lavfi->sink_stream_map);
      89          18 :     av_freep(&lavfi->sink_eof);
      90          18 :     av_freep(&lavfi->stream_sink_map);
      91          18 :     av_freep(&lavfi->sink_stream_subcc_map);
      92          18 :     av_freep(&lavfi->sinks);
      93          18 :     avfilter_graph_free(&lavfi->graph);
      94          18 :     av_frame_free(&lavfi->decoded_frame);
      95             : 
      96          18 :     return 0;
      97             : }
      98             : 
      99          18 : static int create_subcc_streams(AVFormatContext *avctx)
     100             : {
     101          18 :     LavfiContext *lavfi = avctx->priv_data;
     102             :     AVStream *st;
     103             :     int stream_idx, sink_idx;
     104             : 
     105          38 :     for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {
     106          20 :         sink_idx = lavfi->stream_sink_map[stream_idx];
     107          20 :         if (lavfi->sink_stream_subcc_map[sink_idx]) {
     108           2 :             lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;
     109           2 :             if (!(st = avformat_new_stream(avctx, NULL)))
     110           0 :                 return AVERROR(ENOMEM);
     111           2 :             st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
     112           2 :             st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
     113             :         } else {
     114          18 :             lavfi->sink_stream_subcc_map[sink_idx] = -1;
     115             :         }
     116             :     }
     117          18 :     return 0;
     118             : }
     119             : 
     120          18 : av_cold static int lavfi_read_header(AVFormatContext *avctx)
     121             : {
     122          18 :     LavfiContext *lavfi = avctx->priv_data;
     123          18 :     AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
     124             :     const AVFilter *buffersink, *abuffersink;
     125          18 :     int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);
     126             :     enum AVMediaType type;
     127          18 :     int ret = 0, i, n;
     128             : 
     129             : #define FAIL(ERR) { ret = ERR; goto end; }
     130             : 
     131          18 :     if (!pix_fmts)
     132           0 :         FAIL(AVERROR(ENOMEM));
     133             : 
     134          18 :     avfilter_register_all();
     135             : 
     136          18 :     buffersink = avfilter_get_by_name("buffersink");
     137          18 :     abuffersink = avfilter_get_by_name("abuffersink");
     138             : 
     139          18 :     if (lavfi->graph_filename && lavfi->graph_str) {
     140           0 :         av_log(avctx, AV_LOG_ERROR,
     141             :                "Only one of the graph or graph_file options must be specified\n");
     142           0 :         FAIL(AVERROR(EINVAL));
     143             :     }
     144             : 
     145          18 :     if (lavfi->graph_filename) {
     146             :         AVBPrint graph_file_pb;
     147           1 :         AVIOContext *avio = NULL;
     148           1 :         AVDictionary *options = NULL;
     149           1 :         if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
     150           0 :             goto end;
     151           1 :         ret = avio_open2(&avio, lavfi->graph_filename, AVIO_FLAG_READ, &avctx->interrupt_callback, &options);
     152           1 :         av_dict_set(&options, "protocol_whitelist", NULL, 0);
     153           1 :         if (ret < 0)
     154           0 :             goto end;
     155           1 :         av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
     156           1 :         ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
     157           1 :         avio_closep(&avio);
     158           1 :         av_bprint_chars(&graph_file_pb, '\0', 1);
     159           1 :         if (!ret && !av_bprint_is_complete(&graph_file_pb))
     160           0 :             ret = AVERROR(ENOMEM);
     161           1 :         if (ret) {
     162           0 :             av_bprint_finalize(&graph_file_pb, NULL);
     163           0 :             goto end;
     164             :         }
     165           1 :         if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
     166           0 :             goto end;
     167             :     }
     168             : 
     169          18 :     if (!lavfi->graph_str)
     170          17 :         lavfi->graph_str = av_strdup(avctx->filename);
     171             : 
     172             :     /* parse the graph, create a stream for each open output */
     173          18 :     if (!(lavfi->graph = avfilter_graph_alloc()))
     174           0 :         FAIL(AVERROR(ENOMEM));
     175             : 
     176          18 :     if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
     177             :                                     &input_links, &output_links, avctx)) < 0)
     178           0 :         goto end;
     179             : 
     180          18 :     if (input_links) {
     181           0 :         av_log(avctx, AV_LOG_ERROR,
     182             :                "Open inputs in the filtergraph are not acceptable\n");
     183           0 :         FAIL(AVERROR(EINVAL));
     184             :     }
     185             : 
     186             :     /* count the outputs */
     187          18 :     for (n = 0, inout = output_links; inout; n++, inout = inout->next);
     188          18 :     lavfi->nb_sinks = n;
     189             : 
     190          18 :     if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
     191           0 :         FAIL(AVERROR(ENOMEM));
     192          18 :     if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
     193           0 :         FAIL(AVERROR(ENOMEM));
     194          18 :     if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
     195           0 :         FAIL(AVERROR(ENOMEM));
     196          18 :     if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))
     197           0 :         FAIL(AVERROR(ENOMEM));
     198             : 
     199          38 :     for (i = 0; i < n; i++)
     200          20 :         lavfi->stream_sink_map[i] = -1;
     201             : 
     202             :     /* parse the output link names - they need to be of the form out0, out1, ...
     203             :      * create a mapping between them and the streams */
     204          76 :     for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
     205          20 :         int stream_idx = 0, suffix = 0, use_subcc = 0;
     206          20 :         sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
     207          20 :         if (!suffix) {
     208           0 :             av_log(avctx,  AV_LOG_ERROR,
     209             :                    "Invalid outpad name '%s'\n", inout->name);
     210           0 :             FAIL(AVERROR(EINVAL));
     211             :         }
     212          20 :         if (inout->name[suffix]) {
     213           2 :             if (!strcmp(inout->name + suffix, "+subcc")) {
     214           2 :                 use_subcc = 1;
     215             :             } else {
     216           0 :                 av_log(avctx,  AV_LOG_ERROR,
     217             :                        "Invalid outpad suffix '%s'\n", inout->name);
     218           0 :                 FAIL(AVERROR(EINVAL));
     219             :             }
     220             :         }
     221             : 
     222          20 :         if ((unsigned)stream_idx >= n) {
     223           0 :             av_log(avctx, AV_LOG_ERROR,
     224             :                    "Invalid index was specified in output '%s', "
     225             :                    "must be a non-negative value < %d\n",
     226             :                    inout->name, n);
     227           0 :             FAIL(AVERROR(EINVAL));
     228             :         }
     229             : 
     230          20 :         if (lavfi->stream_sink_map[stream_idx] != -1) {
     231           0 :             av_log(avctx,  AV_LOG_ERROR,
     232             :                    "An output with stream index %d was already specified\n",
     233             :                    stream_idx);
     234           0 :             FAIL(AVERROR(EINVAL));
     235             :         }
     236          20 :         lavfi->sink_stream_map[i] = stream_idx;
     237          20 :         lavfi->stream_sink_map[stream_idx] = i;
     238          20 :         lavfi->sink_stream_subcc_map[i] = !!use_subcc;
     239             :     }
     240             : 
     241             :     /* for each open output create a corresponding stream */
     242          38 :     for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
     243             :         AVStream *st;
     244          20 :         if (!(st = avformat_new_stream(avctx, NULL)))
     245           0 :             FAIL(AVERROR(ENOMEM));
     246          20 :         st->id = i;
     247             :     }
     248             : 
     249             :     /* create a sink for each output and connect them to the graph */
     250          18 :     lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
     251          18 :     if (!lavfi->sinks)
     252           0 :         FAIL(AVERROR(ENOMEM));
     253             : 
     254          76 :     for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
     255             :         AVFilterContext *sink;
     256             : 
     257          20 :         type = avfilter_pad_get_type(inout->filter_ctx->output_pads, inout->pad_idx);
     258             : 
     259          20 :         if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
     260           8 :             type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
     261           0 :                 av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
     262           0 :                 FAIL(AVERROR_FILTER_NOT_FOUND);
     263             :         }
     264             : 
     265          20 :         if (type == AVMEDIA_TYPE_VIDEO) {
     266          24 :             ret = avfilter_graph_create_filter(&sink, buffersink,
     267          12 :                                                inout->name, NULL,
     268             :                                                NULL, lavfi->graph);
     269          12 :             if (ret >= 0)
     270          12 :                 ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts,  AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
     271          12 :             if (ret < 0)
     272           0 :                 goto end;
     273           8 :         } else if (type == AVMEDIA_TYPE_AUDIO) {
     274           8 :             enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8,
     275             :                                                   AV_SAMPLE_FMT_S16,
     276             :                                                   AV_SAMPLE_FMT_S32,
     277             :                                                   AV_SAMPLE_FMT_FLT,
     278             :                                                   AV_SAMPLE_FMT_DBL, -1 };
     279             : 
     280          16 :             ret = avfilter_graph_create_filter(&sink, abuffersink,
     281           8 :                                                inout->name, NULL,
     282             :                                                NULL, lavfi->graph);
     283           8 :             if (ret >= 0)
     284           8 :                 ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts,  AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
     285           8 :             if (ret < 0)
     286           0 :                 goto end;
     287           8 :             ret = av_opt_set_int(sink, "all_channel_counts", 1,
     288             :                                  AV_OPT_SEARCH_CHILDREN);
     289           8 :             if (ret < 0)
     290           0 :                 goto end;
     291             :         } else {
     292           0 :             av_log(avctx,  AV_LOG_ERROR,
     293             :                    "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
     294           0 :             FAIL(AVERROR(EINVAL));
     295             :         }
     296             : 
     297          20 :         lavfi->sinks[i] = sink;
     298          20 :         if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
     299           0 :             goto end;
     300             :     }
     301             : 
     302             :     /* configure the graph */
     303          18 :     if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
     304           0 :         goto end;
     305             : 
     306          18 :     if (lavfi->dump_graph) {
     307           0 :         char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
     308           0 :         fputs(dump, stderr);
     309           0 :         fflush(stderr);
     310           0 :         av_free(dump);
     311             :     }
     312             : 
     313             :     /* fill each stream with the information in the corresponding sink */
     314          38 :     for (i = 0; i < lavfi->nb_sinks; i++) {
     315          20 :         AVFilterContext *sink = lavfi->sinks[lavfi->stream_sink_map[i]];
     316          20 :         AVRational time_base = av_buffersink_get_time_base(sink);
     317          20 :         AVStream *st = avctx->streams[i];
     318          20 :         st->codecpar->codec_type = av_buffersink_get_type(sink);
     319          20 :         avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
     320          20 :         if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_VIDEO) {
     321          12 :             st->codecpar->codec_id   = AV_CODEC_ID_RAWVIDEO;
     322          12 :             st->codecpar->format     = av_buffersink_get_format(sink);
     323          12 :             st->codecpar->width      = av_buffersink_get_w(sink);
     324          12 :             st->codecpar->height     = av_buffersink_get_h(sink);
     325          12 :             st       ->sample_aspect_ratio =
     326          12 :             st->codecpar->sample_aspect_ratio = av_buffersink_get_sample_aspect_ratio(sink);
     327          12 :             avctx->probesize = FFMAX(avctx->probesize,
     328             :                                      av_buffersink_get_w(sink) * av_buffersink_get_h(sink) *
     329             :                                      av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(av_buffersink_get_format(sink))) *
     330             :                                      30);
     331           8 :         } else if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_AUDIO) {
     332           8 :             st->codecpar->codec_id    = av_get_pcm_codec(av_buffersink_get_format(sink), -1);
     333           8 :             st->codecpar->channels    = av_buffersink_get_channels(sink);
     334           8 :             st->codecpar->format      = av_buffersink_get_format(sink);
     335           8 :             st->codecpar->sample_rate = av_buffersink_get_sample_rate(sink);
     336           8 :             st->codecpar->channel_layout = av_buffersink_get_channel_layout(sink);
     337           8 :             if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
     338           0 :                 av_log(avctx, AV_LOG_ERROR,
     339             :                        "Could not find PCM codec for sample format %s.\n",
     340           0 :                        av_get_sample_fmt_name(av_buffersink_get_format(sink)));
     341             :         }
     342             :     }
     343             : 
     344          18 :     if ((ret = create_subcc_streams(avctx)) < 0)
     345           0 :         goto end;
     346             : 
     347          18 :     if (!(lavfi->decoded_frame = av_frame_alloc()))
     348           0 :         FAIL(AVERROR(ENOMEM));
     349             : 
     350          36 : end:
     351          18 :     av_free(pix_fmts);
     352          18 :     avfilter_inout_free(&input_links);
     353          18 :     avfilter_inout_free(&output_links);
     354          18 :     if (ret < 0)
     355           0 :         lavfi_read_close(avctx);
     356          18 :     return ret;
     357             : }
     358             : 
     359        4003 : static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame,
     360             :                                int sink_idx)
     361             : {
     362        4003 :     LavfiContext *lavfi = avctx->priv_data;
     363             :     AVFrameSideData *sd;
     364             :     int stream_idx, i, ret;
     365             : 
     366        4003 :     if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
     367        3733 :         return 0;
     368         540 :     for (i = 0; i < frame->nb_side_data; i++)
     369         540 :         if (frame->side_data[i]->type == AV_FRAME_DATA_A53_CC)
     370         270 :             break;
     371         270 :     if (i >= frame->nb_side_data)
     372           0 :         return 0;
     373         270 :     sd = frame->side_data[i];
     374         270 :     if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
     375           0 :         return ret;
     376         270 :     memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
     377         270 :     lavfi->subcc_packet.stream_index = stream_idx;
     378         270 :     lavfi->subcc_packet.pts = frame->pts;
     379         270 :     lavfi->subcc_packet.pos = frame->pkt_pos;
     380         270 :     return 0;
     381             : }
     382             : 
     383        4292 : static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
     384             : {
     385        4292 :     LavfiContext *lavfi = avctx->priv_data;
     386        4292 :     double min_pts = DBL_MAX;
     387        4292 :     int stream_idx, min_pts_sink_idx = 0;
     388        4292 :     AVFrame *frame = lavfi->decoded_frame;
     389             :     AVDictionary *frame_metadata;
     390             :     int ret, i;
     391        4292 :     int size = 0;
     392             : 
     393        4292 :     if (lavfi->subcc_packet.size) {
     394         270 :         *pkt = lavfi->subcc_packet;
     395         270 :         av_init_packet(&lavfi->subcc_packet);
     396         270 :         lavfi->subcc_packet.size = 0;
     397         270 :         lavfi->subcc_packet.data = NULL;
     398         270 :         return pkt->size;
     399             :     }
     400             : 
     401             :     /* iterate through all the graph sinks. Select the sink with the
     402             :      * minimum PTS */
     403        8074 :     for (i = 0; i < lavfi->nb_sinks; i++) {
     404        4052 :         AVRational tb = av_buffersink_get_time_base(lavfi->sinks[i]);
     405             :         double d;
     406             :         int ret;
     407             : 
     408        4052 :         if (lavfi->sink_eof[i])
     409          29 :             continue;
     410             : 
     411        4047 :         ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
     412             :                                             AV_BUFFERSINK_FLAG_PEEK);
     413        4047 :         if (ret == AVERROR_EOF) {
     414             :             ff_dlog(avctx, "EOF sink_idx:%d\n", i);
     415          19 :             lavfi->sink_eof[i] = 1;
     416          19 :             continue;
     417        4028 :         } else if (ret < 0)
     418           0 :             return ret;
     419        4028 :         d = av_rescale_q_rnd(frame->pts, tb, AV_TIME_BASE_Q, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
     420             :         ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
     421        4028 :         av_frame_unref(frame);
     422             : 
     423        4028 :         if (d < min_pts) {
     424        4012 :             min_pts = d;
     425        4012 :             min_pts_sink_idx = i;
     426             :         }
     427             :     }
     428        4022 :     if (min_pts == DBL_MAX)
     429          19 :         return AVERROR_EOF;
     430             : 
     431             :     ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
     432             : 
     433        4003 :     av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
     434        4003 :     stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
     435             : 
     436        4003 :     if (frame->width /* FIXME best way of testing a video */) {
     437         561 :         size = av_image_get_buffer_size(frame->format, frame->width, frame->height, 1);
     438         561 :         if ((ret = av_new_packet(pkt, size)) < 0)
     439           0 :             return ret;
     440             : 
     441        1122 :         av_image_copy_to_buffer(pkt->data, size, (const uint8_t **)frame->data, frame->linesize,
     442         561 :                                 frame->format, frame->width, frame->height, 1);
     443        3442 :     } else if (frame->channels /* FIXME test audio */) {
     444        6884 :         size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
     445        3442 :                                    frame->channels;
     446        3442 :         if ((ret = av_new_packet(pkt, size)) < 0)
     447           0 :             return ret;
     448        3442 :         memcpy(pkt->data, frame->data[0], size);
     449             :     }
     450             : 
     451        4003 :     frame_metadata = frame->metadata;
     452        4003 :     if (frame_metadata) {
     453             :         uint8_t *metadata;
     454         403 :         AVDictionaryEntry *e = NULL;
     455             :         AVBPrint meta_buf;
     456             : 
     457         403 :         av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
     458        2831 :         while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
     459        2025 :             av_bprintf(&meta_buf, "%s", e->key);
     460        2025 :             av_bprint_chars(&meta_buf, '\0', 1);
     461        2025 :             av_bprintf(&meta_buf, "%s", e->value);
     462        2025 :             av_bprint_chars(&meta_buf, '\0', 1);
     463             :         }
     464         806 :         if (!av_bprint_is_complete(&meta_buf) ||
     465         403 :             !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
     466         403 :                                                  meta_buf.len))) {
     467           0 :             av_bprint_finalize(&meta_buf, NULL);
     468           0 :             return AVERROR(ENOMEM);
     469             :         }
     470         403 :         memcpy(metadata, meta_buf.str, meta_buf.len);
     471         403 :         av_bprint_finalize(&meta_buf, NULL);
     472             :     }
     473             : 
     474        4003 :     if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
     475           0 :         av_frame_unref(frame);
     476           0 :         av_packet_unref(pkt);
     477           0 :         return ret;
     478             :     }
     479             : 
     480        4003 :     pkt->stream_index = stream_idx;
     481        4003 :     pkt->pts = frame->pts;
     482        4003 :     pkt->pos = frame->pkt_pos;
     483        4003 :     pkt->size = size;
     484        4003 :     av_frame_unref(frame);
     485        4003 :     return size;
     486             : }
     487             : 
     488             : #define OFFSET(x) offsetof(LavfiContext, x)
     489             : 
     490             : #define DEC AV_OPT_FLAG_DECODING_PARAM
     491             : 
     492             : static const AVOption options[] = {
     493             :     { "graph",     "set libavfilter graph", OFFSET(graph_str),  AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
     494             :     { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
     495             :     { "dumpgraph", "dump graph to stderr",  OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
     496             :     { NULL },
     497             : };
     498             : 
     499             : static const AVClass lavfi_class = {
     500             :     .class_name = "lavfi indev",
     501             :     .item_name  = av_default_item_name,
     502             :     .option     = options,
     503             :     .version    = LIBAVUTIL_VERSION_INT,
     504             :     .category   = AV_CLASS_CATEGORY_DEVICE_INPUT,
     505             : };
     506             : 
     507             : AVInputFormat ff_lavfi_demuxer = {
     508             :     .name           = "lavfi",
     509             :     .long_name      = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
     510             :     .priv_data_size = sizeof(LavfiContext),
     511             :     .read_header    = lavfi_read_header,
     512             :     .read_packet    = lavfi_read_packet,
     513             :     .read_close     = lavfi_read_close,
     514             :     .flags          = AVFMT_NOFILE,
     515             :     .priv_class     = &lavfi_class,
     516             : };

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