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  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.         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.         }
  252.  
  253.         lavfi->sinks[i] = sink;
  254.         if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
  255.             FAIL(ret);
  256.     }
  257.  
  258.     /* configure the graph */
  259.     if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
  260.         FAIL(ret);
  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. };
  425.  
  426. AVInputFormat ff_lavfi_demuxer = {
  427.     .name           = "lavfi",
  428.     .long_name      = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
  429.     .priv_data_size = sizeof(LavfiContext),
  430.     .read_header    = lavfi_read_header,
  431.     .read_packet    = lavfi_read_packet,
  432.     .read_close     = lavfi_read_close,
  433.     .flags          = AVFMT_NOFILE,
  434.     .priv_class     = &lavfi_class,
  435. };
  436.