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author | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2011-06-11 15:40:08 +0200 |
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committer | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2011-08-11 17:20:17 +0200 |
commit | 214357341a1ae35e0ca9052400099edaad7afcb4 (patch) | |
tree | 32c1d3b9a3dfc2ae733182c07f796e8dfde66a9f /libavdevice/lavfi.c | |
parent | e72657f83dc9f31dc0c1eb09ab2e7e704d59643e (diff) | |
download | ffmpeg-streaming-214357341a1ae35e0ca9052400099edaad7afcb4.zip ffmpeg-streaming-214357341a1ae35e0ca9052400099edaad7afcb4.tar.gz |
lavdev: add libavfilter virtual input device
This input device is to be considered still experimental, only video
output is supported.
Diffstat (limited to 'libavdevice/lavfi.c')
-rw-r--r-- | libavdevice/lavfi.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/libavdevice/lavfi.c b/libavdevice/lavfi.c new file mode 100644 index 0000000..d525bfb --- /dev/null +++ b/libavdevice/lavfi.c @@ -0,0 +1,282 @@ +/* + * Copyright (c) 2011 Stefano Sabatini + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * libavfilter virtual input device + */ + +/* #define DEBUG */ + +#include "float.h" /* DBL_MIN, DBL_MAX */ + +#include "libavutil/log.h" +#include "libavutil/mem.h" +#include "libavutil/opt.h" +#include "libavutil/parseutils.h" +#include "libavutil/pixdesc.h" +#include "libavfilter/avfilter.h" +#include "libavfilter/avfiltergraph.h" +#include "libavfilter/vsink_buffer.h" +#include "avdevice.h" + +typedef struct { + AVClass *class; ///< class for private options + char *graph_str; + AVFilterGraph *graph; + AVFilterContext **sinks; + int *sink_stream_map; + int *stream_sink_map; +} LavfiContext; + +static int *create_all_formats(int n) +{ + int i, j, *fmts, count = 0; + + for (i = 0; i < n; i++) + if (!(av_pix_fmt_descriptors[i].flags & PIX_FMT_HWACCEL)) + count++; + + if (!(fmts = av_malloc((count+1) * sizeof(int)))) + return NULL; + for (j = 0, i = 0; i < n; i++) { + if (!(av_pix_fmt_descriptors[i].flags & PIX_FMT_HWACCEL)) + fmts[j++] = i; + } + fmts[j] = -1; + return fmts; +} + +av_cold static int lavfi_read_close(AVFormatContext *avctx) +{ + LavfiContext *lavfi = avctx->priv_data; + + av_freep(&lavfi->sink_stream_map); + av_freep(&lavfi->stream_sink_map); + avfilter_graph_free(&lavfi->graph); + + return 0; +} + +av_cold static int lavfi_read_header(AVFormatContext *avctx, + AVFormatParameters *ap) +{ + LavfiContext *lavfi = avctx->priv_data; + AVFilterInOut *input_links = NULL, *output_links = NULL, *inout; + AVFilter *buffersink; + int *pix_fmts = create_all_formats(PIX_FMT_NB); + int ret = 0, i, n; + +#define FAIL(ERR) { ret = ERR; goto end; } + + avfilter_register_all(); + + if (!(buffersink = avfilter_get_by_name("buffersink"))) { + av_log(avctx, AV_LOG_ERROR, + "Missing required buffersink filter, aborting.\n"); + FAIL(AVERROR_FILTER_NOT_FOUND); + } + + if (!lavfi->graph_str) + lavfi->graph_str = av_strdup(avctx->filename); + + /* parse the graph, create a stream for each open output */ + if (!(lavfi->graph = avfilter_graph_alloc())) + FAIL(AVERROR(ENOMEM)); + + if ((ret = avfilter_graph_parse(lavfi->graph, lavfi->graph_str, + &input_links, &output_links, avctx)) < 0) + FAIL(ret); + + if (input_links) { + av_log(avctx, AV_LOG_ERROR, + "Open inputs in the filtergraph are not acceptable\n"); + FAIL(AVERROR(EINVAL)); + } + + /* count the outputs */ + for (n = 0, inout = output_links; inout; n++, inout = inout->next); + + if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n))) + FAIL(AVERROR(ENOMEM)); + if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n))) + FAIL(AVERROR(ENOMEM)); + + for (i = 0; i < n; i++) + lavfi->stream_sink_map[i] = -1; + + /* parse the output link names - they need to be of the form out0, out1, ... + * create a mapping between them and the streams */ + for (i = 0, inout = output_links; inout; i++, inout = inout->next) { + int stream_idx; + if (!strcmp(inout->name, "out")) + stream_idx = 0; + else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) { + av_log(avctx, AV_LOG_ERROR, + "Invalid outpad name '%s'\n", inout->name); + FAIL(AVERROR(EINVAL)); + } + + if ((unsigned)stream_idx >= n) { + av_log(avctx, AV_LOG_ERROR, + "Invalid index was specified in output '%s', " + "must be a non-negative value < %d\n", + inout->name, n); + FAIL(AVERROR(EINVAL)); + } + + /* is a video output? */ + if (inout->filter_ctx->output_pads[inout->pad_idx].type != AVMEDIA_TYPE_VIDEO) { + av_log(avctx, AV_LOG_ERROR, + "Output '%s' is not a video output, not yet supported", inout->name); + FAIL(AVERROR(EINVAL)); + } + + if (lavfi->stream_sink_map[stream_idx] != -1) { + av_log(avctx, AV_LOG_ERROR, + "An with stream index %d was already specified\n", + stream_idx); + FAIL(AVERROR(EINVAL)); + } + lavfi->sink_stream_map[i] = stream_idx; + lavfi->stream_sink_map[stream_idx] = i; + } + + /* for each open output create a corresponding stream */ + for (i = 0, inout = output_links; inout; i++, inout = inout->next) { + AVStream *st; + if (!(st = av_new_stream(avctx, i))) + FAIL(AVERROR(ENOMEM)); + } + + /* create a sink for each output and connect them to the graph */ + lavfi->sinks = av_malloc(sizeof(AVFilterContext *) * avctx->nb_streams); + if (!lavfi->sinks) + FAIL(AVERROR(ENOMEM)); + + for (i = 0, inout = output_links; inout; i++, inout = inout->next) { + AVFilterContext *sink; + if ((ret = avfilter_graph_create_filter(&sink, buffersink, + inout->name, NULL, + pix_fmts, lavfi->graph)) < 0) + FAIL(ret); + lavfi->sinks[i] = sink; + if ((ret = avfilter_link(inout->filter_ctx, 0, sink, 0)) < 0) + FAIL(ret); + } + + /* configure the graph */ + if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0) + FAIL(ret); + + /* fill each stream with the information in the corresponding sink */ + for (i = 0; i < avctx->nb_streams; i++) { + AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0]; + AVStream *st = avctx->streams[i]; + st->codec->codec_type = link->type; + av_set_pts_info(st, 64, link->time_base.num, link->time_base.den); + if (link->type == AVMEDIA_TYPE_VIDEO) { + st->codec->codec_id = CODEC_ID_RAWVIDEO; + st->codec->pix_fmt = link->format; + st->codec->time_base = link->time_base; + st->codec->width = link->w; + st->codec->height = link->h; + } + } + +end: + avfilter_inout_free(&input_links); + avfilter_inout_free(&output_links); + if (ret < 0) + lavfi_read_close(avctx); + return ret; +} + +static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt) +{ + LavfiContext *lavfi = avctx->priv_data; + double min_pts = DBL_MAX; + int min_pts_sink_idx; + AVFilterBufferRef *picref; + AVPicture pict; + int ret, i, size; + + /* iterate through all the graph sinks. Select the sink with the + * minimum PTS */ + for (i = 0; i < avctx->nb_streams; i++) { + AVRational tb = lavfi->sinks[i]->inputs[0]->time_base; + double d; + int ret = av_vsink_buffer_get_video_buffer_ref(lavfi->sinks[i], + &picref, AV_VSINK_BUF_FLAG_PEEK); + if (ret < 0) + return ret; + d = av_rescale_q(picref->pts, tb, AV_TIME_BASE_Q); + if (d < min_pts) { + min_pts = d; + min_pts_sink_idx = i; + } + } + + av_vsink_buffer_get_video_buffer_ref(lavfi->sinks[min_pts_sink_idx], + &picref, 0); + + size = avpicture_get_size(picref->format, picref->video->w, picref->video->h); + if ((ret = av_new_packet(pkt, size)) < 0) + return ret; + + memcpy(pict.data, picref->data, 4*sizeof(picref->data[0])); + memcpy(pict.linesize, picref->linesize, 4*sizeof(picref->linesize[0])); + + avpicture_layout(&pict, picref->format, picref->video->w, + picref->video->h, pkt->data, size); + pkt->stream_index = lavfi->sink_stream_map[min_pts_sink_idx]; + pkt->pts = picref->pts; + pkt->size = size; + avfilter_unref_buffer(picref); + + return size; +} + +#define OFFSET(x) offsetof(LavfiContext, x) + +#define DEC AV_OPT_FLAG_DECODING_PARAM + +static const AVOption options[] = { + { "graph", "Libavfilter graph", OFFSET(graph_str), FF_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC }, + { NULL }, +}; + +static const AVClass lavfi_class = { + .class_name = "lavfi indev", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVInputFormat ff_lavfi_demuxer = { + .name = "lavfi", + .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"), + .priv_data_size = sizeof(LavfiContext), + .read_header = lavfi_read_header, + .read_packet = lavfi_read_packet, + .read_close = lavfi_read_close, + .flags = AVFMT_NOFILE, + .priv_class = &lavfi_class, +}; |