yading@10: /* yading@10: * Copyright (c) 2011 Stefano Sabatini yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * libavfilter virtual input device yading@10: */ yading@10: yading@10: /* #define DEBUG */ yading@10: yading@10: #include /* DBL_MIN, DBL_MAX */ yading@10: yading@10: #include "libavutil/bprint.h" yading@10: #include "libavutil/channel_layout.h" yading@10: #include "libavutil/file.h" yading@10: #include "libavutil/log.h" yading@10: #include "libavutil/mem.h" yading@10: #include "libavutil/opt.h" yading@10: #include "libavutil/parseutils.h" yading@10: #include "libavutil/pixdesc.h" yading@10: #include "libavfilter/avfilter.h" yading@10: #include "libavfilter/avfiltergraph.h" yading@10: #include "libavfilter/buffersink.h" yading@10: #include "libavformat/internal.h" yading@10: #include "avdevice.h" yading@10: yading@10: typedef struct { yading@10: AVClass *class; ///< class for private options yading@10: char *graph_str; yading@10: char *graph_filename; yading@10: char *dump_graph; yading@10: AVFilterGraph *graph; yading@10: AVFilterContext **sinks; yading@10: int *sink_stream_map; yading@10: int *sink_eof; yading@10: int *stream_sink_map; yading@10: AVFrame *decoded_frame; yading@10: } LavfiContext; yading@10: yading@10: static int *create_all_formats(int n) yading@10: { yading@10: int i, j, *fmts, count = 0; yading@10: yading@10: for (i = 0; i < n; i++) { yading@10: const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i); yading@10: if (!(desc->flags & PIX_FMT_HWACCEL)) yading@10: count++; yading@10: } yading@10: yading@10: if (!(fmts = av_malloc((count+1) * sizeof(int)))) yading@10: return NULL; yading@10: for (j = 0, i = 0; i < n; i++) { yading@10: const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i); yading@10: if (!(desc->flags & PIX_FMT_HWACCEL)) yading@10: fmts[j++] = i; yading@10: } yading@10: fmts[j] = -1; yading@10: return fmts; yading@10: } yading@10: yading@10: av_cold static int lavfi_read_close(AVFormatContext *avctx) yading@10: { yading@10: LavfiContext *lavfi = avctx->priv_data; yading@10: yading@10: av_freep(&lavfi->sink_stream_map); yading@10: av_freep(&lavfi->sink_eof); yading@10: av_freep(&lavfi->stream_sink_map); yading@10: av_freep(&lavfi->sinks); yading@10: avfilter_graph_free(&lavfi->graph); yading@10: av_frame_free(&lavfi->decoded_frame); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: av_cold static int lavfi_read_header(AVFormatContext *avctx) yading@10: { yading@10: LavfiContext *lavfi = avctx->priv_data; yading@10: AVFilterInOut *input_links = NULL, *output_links = NULL, *inout; yading@10: AVFilter *buffersink, *abuffersink; yading@10: int *pix_fmts = create_all_formats(AV_PIX_FMT_NB); yading@10: enum AVMediaType type; yading@10: int ret = 0, i, n; yading@10: yading@10: #define FAIL(ERR) { ret = ERR; goto end; } yading@10: yading@10: if (!pix_fmts) yading@10: FAIL(AVERROR(ENOMEM)); yading@10: yading@10: avfilter_register_all(); yading@10: yading@10: buffersink = avfilter_get_by_name("buffersink"); yading@10: abuffersink = avfilter_get_by_name("abuffersink"); yading@10: yading@10: if (lavfi->graph_filename && lavfi->graph_str) { yading@10: av_log(avctx, AV_LOG_ERROR, yading@10: "Only one of the graph or graph_file options must be specified\n"); yading@10: FAIL(AVERROR(EINVAL)); yading@10: } yading@10: yading@10: if (lavfi->graph_filename) { yading@10: uint8_t *file_buf, *graph_buf; yading@10: size_t file_bufsize; yading@10: ret = av_file_map(lavfi->graph_filename, yading@10: &file_buf, &file_bufsize, 0, avctx); yading@10: if (ret < 0) yading@10: goto end; yading@10: yading@10: /* create a 0-terminated string based on the read file */ yading@10: graph_buf = av_malloc(file_bufsize + 1); yading@10: if (!graph_buf) { yading@10: av_file_unmap(file_buf, file_bufsize); yading@10: FAIL(AVERROR(ENOMEM)); yading@10: } yading@10: memcpy(graph_buf, file_buf, file_bufsize); yading@10: graph_buf[file_bufsize] = 0; yading@10: av_file_unmap(file_buf, file_bufsize); yading@10: lavfi->graph_str = graph_buf; yading@10: } yading@10: yading@10: if (!lavfi->graph_str) yading@10: lavfi->graph_str = av_strdup(avctx->filename); yading@10: yading@10: /* parse the graph, create a stream for each open output */ yading@10: if (!(lavfi->graph = avfilter_graph_alloc())) yading@10: FAIL(AVERROR(ENOMEM)); yading@10: yading@10: if ((ret = avfilter_graph_parse(lavfi->graph, lavfi->graph_str, yading@10: &input_links, &output_links, avctx)) < 0) yading@10: FAIL(ret); yading@10: yading@10: if (input_links) { yading@10: av_log(avctx, AV_LOG_ERROR, yading@10: "Open inputs in the filtergraph are not acceptable\n"); yading@10: FAIL(AVERROR(EINVAL)); yading@10: } yading@10: yading@10: /* count the outputs */ yading@10: for (n = 0, inout = output_links; inout; n++, inout = inout->next); yading@10: yading@10: if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n))) yading@10: FAIL(AVERROR(ENOMEM)); yading@10: if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n))) yading@10: FAIL(AVERROR(ENOMEM)); yading@10: if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n))) yading@10: FAIL(AVERROR(ENOMEM)); yading@10: yading@10: for (i = 0; i < n; i++) yading@10: lavfi->stream_sink_map[i] = -1; yading@10: yading@10: /* parse the output link names - they need to be of the form out0, out1, ... yading@10: * create a mapping between them and the streams */ yading@10: for (i = 0, inout = output_links; inout; i++, inout = inout->next) { yading@10: int stream_idx; yading@10: if (!strcmp(inout->name, "out")) yading@10: stream_idx = 0; yading@10: else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) { yading@10: av_log(avctx, AV_LOG_ERROR, yading@10: "Invalid outpad name '%s'\n", inout->name); yading@10: FAIL(AVERROR(EINVAL)); yading@10: } yading@10: yading@10: if ((unsigned)stream_idx >= n) { yading@10: av_log(avctx, AV_LOG_ERROR, yading@10: "Invalid index was specified in output '%s', " yading@10: "must be a non-negative value < %d\n", yading@10: inout->name, n); yading@10: FAIL(AVERROR(EINVAL)); yading@10: } yading@10: yading@10: /* is an audio or video output? */ yading@10: type = inout->filter_ctx->output_pads[inout->pad_idx].type; yading@10: if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) { yading@10: av_log(avctx, AV_LOG_ERROR, yading@10: "Output '%s' is not a video or audio output, not yet supported\n", inout->name); yading@10: FAIL(AVERROR(EINVAL)); yading@10: } yading@10: yading@10: if (lavfi->stream_sink_map[stream_idx] != -1) { yading@10: av_log(avctx, AV_LOG_ERROR, yading@10: "An output with stream index %d was already specified\n", yading@10: stream_idx); yading@10: FAIL(AVERROR(EINVAL)); yading@10: } yading@10: lavfi->sink_stream_map[i] = stream_idx; yading@10: lavfi->stream_sink_map[stream_idx] = i; yading@10: } yading@10: yading@10: /* for each open output create a corresponding stream */ yading@10: for (i = 0, inout = output_links; inout; i++, inout = inout->next) { yading@10: AVStream *st; yading@10: if (!(st = avformat_new_stream(avctx, NULL))) yading@10: FAIL(AVERROR(ENOMEM)); yading@10: st->id = i; yading@10: } yading@10: yading@10: /* create a sink for each output and connect them to the graph */ yading@10: lavfi->sinks = av_malloc(sizeof(AVFilterContext *) * avctx->nb_streams); yading@10: if (!lavfi->sinks) yading@10: FAIL(AVERROR(ENOMEM)); yading@10: yading@10: for (i = 0, inout = output_links; inout; i++, inout = inout->next) { yading@10: AVFilterContext *sink; yading@10: yading@10: type = inout->filter_ctx->output_pads[inout->pad_idx].type; yading@10: yading@10: if (type == AVMEDIA_TYPE_VIDEO && ! buffersink || yading@10: type == AVMEDIA_TYPE_AUDIO && ! abuffersink) { yading@10: av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n"); yading@10: FAIL(AVERROR_FILTER_NOT_FOUND); yading@10: } yading@10: yading@10: if (type == AVMEDIA_TYPE_VIDEO) { yading@10: ret = avfilter_graph_create_filter(&sink, buffersink, yading@10: inout->name, NULL, yading@10: NULL, lavfi->graph); yading@10: if (ret >= 0) yading@10: ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN); yading@10: if (ret < 0) yading@10: goto end; yading@10: } else if (type == AVMEDIA_TYPE_AUDIO) { yading@10: enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8, yading@10: AV_SAMPLE_FMT_S16, yading@10: AV_SAMPLE_FMT_S32, yading@10: AV_SAMPLE_FMT_FLT, yading@10: AV_SAMPLE_FMT_DBL, -1 }; yading@10: yading@10: ret = avfilter_graph_create_filter(&sink, abuffersink, yading@10: inout->name, NULL, yading@10: NULL, lavfi->graph); yading@10: if (ret >= 0) yading@10: ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN); yading@10: if (ret < 0) yading@10: goto end; yading@10: } yading@10: yading@10: lavfi->sinks[i] = sink; yading@10: if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0) yading@10: FAIL(ret); yading@10: } yading@10: yading@10: /* configure the graph */ yading@10: if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0) yading@10: FAIL(ret); yading@10: yading@10: if (lavfi->dump_graph) { yading@10: char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph); yading@10: fputs(dump, stderr); yading@10: fflush(stderr); yading@10: av_free(dump); yading@10: } yading@10: yading@10: /* fill each stream with the information in the corresponding sink */ yading@10: for (i = 0; i < avctx->nb_streams; i++) { yading@10: AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0]; yading@10: AVStream *st = avctx->streams[i]; yading@10: st->codec->codec_type = link->type; yading@10: avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den); yading@10: if (link->type == AVMEDIA_TYPE_VIDEO) { yading@10: st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; yading@10: st->codec->pix_fmt = link->format; yading@10: st->codec->time_base = link->time_base; yading@10: st->codec->width = link->w; yading@10: st->codec->height = link->h; yading@10: st ->sample_aspect_ratio = yading@10: st->codec->sample_aspect_ratio = link->sample_aspect_ratio; yading@10: avctx->probesize = FFMAX(avctx->probesize, yading@10: link->w * link->h * yading@10: av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) * yading@10: 30); yading@10: } else if (link->type == AVMEDIA_TYPE_AUDIO) { yading@10: st->codec->codec_id = av_get_pcm_codec(link->format, -1); yading@10: st->codec->channels = av_get_channel_layout_nb_channels(link->channel_layout); yading@10: st->codec->sample_fmt = link->format; yading@10: st->codec->sample_rate = link->sample_rate; yading@10: st->codec->time_base = link->time_base; yading@10: st->codec->channel_layout = link->channel_layout; yading@10: if (st->codec->codec_id == AV_CODEC_ID_NONE) yading@10: av_log(avctx, AV_LOG_ERROR, yading@10: "Could not find PCM codec for sample format %s.\n", yading@10: av_get_sample_fmt_name(link->format)); yading@10: } yading@10: } yading@10: yading@10: if (!(lavfi->decoded_frame = av_frame_alloc())) yading@10: FAIL(AVERROR(ENOMEM)); yading@10: yading@10: end: yading@10: av_free(pix_fmts); yading@10: avfilter_inout_free(&input_links); yading@10: avfilter_inout_free(&output_links); yading@10: if (ret < 0) yading@10: lavfi_read_close(avctx); yading@10: return ret; yading@10: } yading@10: yading@10: static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt) yading@10: { yading@10: LavfiContext *lavfi = avctx->priv_data; yading@10: double min_pts = DBL_MAX; yading@10: int stream_idx, min_pts_sink_idx = 0; yading@10: AVFrame *frame = lavfi->decoded_frame; yading@10: AVPicture pict; yading@10: AVDictionary *frame_metadata; yading@10: int ret, i; yading@10: int size = 0; yading@10: yading@10: /* iterate through all the graph sinks. Select the sink with the yading@10: * minimum PTS */ yading@10: for (i = 0; i < avctx->nb_streams; i++) { yading@10: AVRational tb = lavfi->sinks[i]->inputs[0]->time_base; yading@10: double d; yading@10: int ret; yading@10: yading@10: if (lavfi->sink_eof[i]) yading@10: continue; yading@10: yading@10: ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame, yading@10: AV_BUFFERSINK_FLAG_PEEK); yading@10: if (ret == AVERROR_EOF) { yading@10: av_dlog(avctx, "EOF sink_idx:%d\n", i); yading@10: lavfi->sink_eof[i] = 1; yading@10: continue; yading@10: } else if (ret < 0) yading@10: return ret; yading@10: d = av_rescale_q(frame->pts, tb, AV_TIME_BASE_Q); yading@10: av_dlog(avctx, "sink_idx:%d time:%f\n", i, d); yading@10: av_frame_unref(frame); yading@10: yading@10: if (d < min_pts) { yading@10: min_pts = d; yading@10: min_pts_sink_idx = i; yading@10: } yading@10: } yading@10: if (min_pts == DBL_MAX) yading@10: return AVERROR_EOF; yading@10: yading@10: av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx); yading@10: yading@10: av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0); yading@10: stream_idx = lavfi->sink_stream_map[min_pts_sink_idx]; yading@10: yading@10: if (frame->width /* FIXME best way of testing a video */) { yading@10: size = avpicture_get_size(frame->format, frame->width, frame->height); yading@10: if ((ret = av_new_packet(pkt, size)) < 0) yading@10: return ret; yading@10: yading@10: memcpy(pict.data, frame->data, 4*sizeof(frame->data[0])); yading@10: memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0])); yading@10: yading@10: avpicture_layout(&pict, frame->format, frame->width, frame->height, yading@10: pkt->data, size); yading@10: } else if (av_frame_get_channels(frame) /* FIXME test audio */) { yading@10: size = frame->nb_samples * av_get_bytes_per_sample(frame->format) * yading@10: av_frame_get_channels(frame); yading@10: if ((ret = av_new_packet(pkt, size)) < 0) yading@10: return ret; yading@10: memcpy(pkt->data, frame->data[0], size); yading@10: } yading@10: yading@10: frame_metadata = av_frame_get_metadata(frame); yading@10: if (frame_metadata) { yading@10: uint8_t *metadata; yading@10: AVDictionaryEntry *e = NULL; yading@10: AVBPrint meta_buf; yading@10: yading@10: av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED); yading@10: while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) { yading@10: av_bprintf(&meta_buf, "%s", e->key); yading@10: av_bprint_chars(&meta_buf, '\0', 1); yading@10: av_bprintf(&meta_buf, "%s", e->value); yading@10: av_bprint_chars(&meta_buf, '\0', 1); yading@10: } yading@10: if (!av_bprint_is_complete(&meta_buf) || yading@10: !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA, yading@10: meta_buf.len))) { yading@10: av_bprint_finalize(&meta_buf, NULL); yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: memcpy(metadata, meta_buf.str, meta_buf.len); yading@10: av_bprint_finalize(&meta_buf, NULL); yading@10: } yading@10: yading@10: pkt->stream_index = stream_idx; yading@10: pkt->pts = frame->pts; yading@10: pkt->pos = av_frame_get_pkt_pos(frame); yading@10: pkt->size = size; yading@10: av_frame_unref(frame); yading@10: return size; yading@10: } yading@10: yading@10: #define OFFSET(x) offsetof(LavfiContext, x) yading@10: yading@10: #define DEC AV_OPT_FLAG_DECODING_PARAM yading@10: yading@10: static const AVOption options[] = { yading@10: { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, yading@10: { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC}, yading@10: { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, yading@10: { NULL }, yading@10: }; yading@10: yading@10: static const AVClass lavfi_class = { yading@10: .class_name = "lavfi indev", yading@10: .item_name = av_default_item_name, yading@10: .option = options, yading@10: .version = LIBAVUTIL_VERSION_INT, yading@10: }; yading@10: yading@10: AVInputFormat ff_lavfi_demuxer = { yading@10: .name = "lavfi", yading@10: .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"), yading@10: .priv_data_size = sizeof(LavfiContext), yading@10: .read_header = lavfi_read_header, yading@10: .read_packet = lavfi_read_packet, yading@10: .read_close = lavfi_read_close, yading@10: .flags = AVFMT_NOFILE, yading@10: .priv_class = &lavfi_class, yading@10: };