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![Jean First](/assets/img/avatar_default.png)
Signed-off-by: Jean First <jeanfirst@gmail.com> Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
352 lines
12 KiB
C
352 lines
12 KiB
C
/*
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* Copyright (c) 2011 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* libavfilter virtual input device
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*/
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/* #define DEBUG */
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#include "float.h" /* DBL_MIN, DBL_MAX */
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#include "libavutil/log.h"
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavfilter/avfilter.h"
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#include "libavfilter/avfiltergraph.h"
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#include "libavfilter/buffersink.h"
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#include "libavformat/internal.h"
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#include "avdevice.h"
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typedef struct {
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AVClass *class; ///< class for private options
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char *graph_str;
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AVFilterGraph *graph;
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AVFilterContext **sinks;
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int *sink_stream_map;
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int *stream_sink_map;
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} LavfiContext;
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static int *create_all_formats(int n)
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{
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int i, j, *fmts, count = 0;
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for (i = 0; i < n; i++)
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if (!(av_pix_fmt_descriptors[i].flags & PIX_FMT_HWACCEL))
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count++;
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if (!(fmts = av_malloc((count+1) * sizeof(int))))
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return NULL;
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for (j = 0, i = 0; i < n; i++) {
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if (!(av_pix_fmt_descriptors[i].flags & PIX_FMT_HWACCEL))
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fmts[j++] = i;
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}
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fmts[j] = -1;
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return fmts;
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}
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av_cold static int lavfi_read_close(AVFormatContext *avctx)
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{
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LavfiContext *lavfi = avctx->priv_data;
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av_freep(&lavfi->sink_stream_map);
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av_freep(&lavfi->stream_sink_map);
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av_freep(&lavfi->sinks);
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avfilter_graph_free(&lavfi->graph);
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return 0;
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}
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av_cold static int lavfi_read_header(AVFormatContext *avctx,
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AVFormatParameters *ap)
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{
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LavfiContext *lavfi = avctx->priv_data;
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AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
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AVFilter *buffersink, *abuffersink;
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int *pix_fmts = create_all_formats(PIX_FMT_NB);
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enum AVMediaType type;
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int ret = 0, i, n;
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#define FAIL(ERR) { ret = ERR; goto end; }
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if (!pix_fmts)
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FAIL(AVERROR(ENOMEM));
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avfilter_register_all();
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buffersink = avfilter_get_by_name("buffersink");
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abuffersink = avfilter_get_by_name("abuffersink");
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if (!lavfi->graph_str)
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lavfi->graph_str = av_strdup(avctx->filename);
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/* parse the graph, create a stream for each open output */
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if (!(lavfi->graph = avfilter_graph_alloc()))
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FAIL(AVERROR(ENOMEM));
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if ((ret = avfilter_graph_parse(lavfi->graph, lavfi->graph_str,
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&input_links, &output_links, avctx)) < 0)
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FAIL(ret);
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if (input_links) {
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av_log(avctx, AV_LOG_ERROR,
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"Open inputs in the filtergraph are not acceptable\n");
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FAIL(AVERROR(EINVAL));
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}
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/* count the outputs */
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for (n = 0, inout = output_links; inout; n++, inout = inout->next);
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if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
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FAIL(AVERROR(ENOMEM));
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if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
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FAIL(AVERROR(ENOMEM));
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for (i = 0; i < n; i++)
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lavfi->stream_sink_map[i] = -1;
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/* parse the output link names - they need to be of the form out0, out1, ...
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* create a mapping between them and the streams */
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for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
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int stream_idx;
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if (!strcmp(inout->name, "out"))
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stream_idx = 0;
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else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) {
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av_log(avctx, AV_LOG_ERROR,
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"Invalid outpad name '%s'\n", inout->name);
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FAIL(AVERROR(EINVAL));
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}
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if ((unsigned)stream_idx >= n) {
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av_log(avctx, AV_LOG_ERROR,
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"Invalid index was specified in output '%s', "
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"must be a non-negative value < %d\n",
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inout->name, n);
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FAIL(AVERROR(EINVAL));
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}
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/* is an audio or video output? */
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type = inout->filter_ctx->output_pads[inout->pad_idx].type;
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if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
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av_log(avctx, AV_LOG_ERROR,
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"Output '%s' is not a video or audio output, not yet supported\n", inout->name);
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FAIL(AVERROR(EINVAL));
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}
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if (lavfi->stream_sink_map[stream_idx] != -1) {
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av_log(avctx, AV_LOG_ERROR,
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"An output with stream index %d was already specified\n",
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stream_idx);
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FAIL(AVERROR(EINVAL));
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}
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lavfi->sink_stream_map[i] = stream_idx;
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lavfi->stream_sink_map[stream_idx] = i;
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}
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/* for each open output create a corresponding stream */
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for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
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AVStream *st;
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if (!(st = avformat_new_stream(avctx, NULL)))
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FAIL(AVERROR(ENOMEM));
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st->id = i;
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}
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/* create a sink for each output and connect them to the graph */
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lavfi->sinks = av_malloc(sizeof(AVFilterContext *) * avctx->nb_streams);
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if (!lavfi->sinks)
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FAIL(AVERROR(ENOMEM));
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for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
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AVFilterContext *sink;
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type = inout->filter_ctx->output_pads[inout->pad_idx].type;
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if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
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type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
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av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
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FAIL(AVERROR_FILTER_NOT_FOUND);
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}
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if (type == AVMEDIA_TYPE_VIDEO) {
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AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
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#if FF_API_OLD_VSINK_API
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ret = avfilter_graph_create_filter(&sink, buffersink,
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inout->name, NULL,
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pix_fmts, lavfi->graph);
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#else
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buffersink_params->pixel_fmts = pix_fmts;
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ret = avfilter_graph_create_filter(&sink, buffersink,
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inout->name, NULL,
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buffersink_params, lavfi->graph);
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#endif
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av_freep(&buffersink_params);
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if (ret < 0)
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goto end;
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} else if (type == AVMEDIA_TYPE_AUDIO) {
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enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, -1 };
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const int packing_fmts[] = { AVFILTER_PACKED, -1 };
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const int64_t *chlayouts = avfilter_all_channel_layouts;
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AVABufferSinkParams *abuffersink_params = av_abuffersink_params_alloc();
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abuffersink_params->sample_fmts = sample_fmts;
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abuffersink_params->packing_fmts = packing_fmts;
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abuffersink_params->channel_layouts = chlayouts;
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ret = avfilter_graph_create_filter(&sink, abuffersink,
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inout->name, NULL,
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abuffersink_params, lavfi->graph);
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av_free(abuffersink_params);
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if (ret < 0)
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goto end;
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}
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lavfi->sinks[i] = sink;
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if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
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FAIL(ret);
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}
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/* configure the graph */
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if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
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FAIL(ret);
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/* fill each stream with the information in the corresponding sink */
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for (i = 0; i < avctx->nb_streams; i++) {
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AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
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AVStream *st = avctx->streams[i];
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st->codec->codec_type = link->type;
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avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
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if (link->type == AVMEDIA_TYPE_VIDEO) {
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st->codec->codec_id = CODEC_ID_RAWVIDEO;
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st->codec->pix_fmt = link->format;
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st->codec->time_base = link->time_base;
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st->codec->width = link->w;
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st->codec->height = link->h;
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st ->sample_aspect_ratio =
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st->codec->sample_aspect_ratio = link->sample_aspect_ratio;
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} else if (link->type == AVMEDIA_TYPE_AUDIO) {
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st->codec->codec_id = CODEC_ID_PCM_S16LE;
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st->codec->channels = av_get_channel_layout_nb_channels(link->channel_layout);
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st->codec->sample_fmt = link->format;
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st->codec->sample_rate = link->sample_rate;
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st->codec->time_base = link->time_base;
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st->codec->channel_layout = link->channel_layout;
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}
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}
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end:
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av_free(pix_fmts);
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avfilter_inout_free(&input_links);
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avfilter_inout_free(&output_links);
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if (ret < 0)
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lavfi_read_close(avctx);
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return ret;
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}
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static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
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{
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LavfiContext *lavfi = avctx->priv_data;
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double min_pts = DBL_MAX;
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int stream_idx, min_pts_sink_idx = 0;
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AVFilterBufferRef *ref;
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AVPicture pict;
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int ret, i;
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int size = 0;
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/* iterate through all the graph sinks. Select the sink with the
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* minimum PTS */
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for (i = 0; i < avctx->nb_streams; i++) {
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AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;
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double d;
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int ret = av_buffersink_get_buffer_ref(lavfi->sinks[i],
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&ref, AV_BUFFERSINK_FLAG_PEEK);
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if (ret < 0)
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return ret;
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d = av_rescale_q(ref->pts, tb, AV_TIME_BASE_Q);
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av_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
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if (d < min_pts) {
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min_pts = d;
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min_pts_sink_idx = i;
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}
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}
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av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
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av_buffersink_get_buffer_ref(lavfi->sinks[min_pts_sink_idx], &ref, 0);
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stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
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if (ref->video) {
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size = avpicture_get_size(ref->format, ref->video->w, ref->video->h);
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if ((ret = av_new_packet(pkt, size)) < 0)
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return ret;
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memcpy(pict.data, ref->data, 4*sizeof(ref->data[0]));
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memcpy(pict.linesize, ref->linesize, 4*sizeof(ref->linesize[0]));
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avpicture_layout(&pict, ref->format, ref->video->w,
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ref->video->h, pkt->data, size);
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} else if (ref->audio) {
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size = ref->audio->nb_samples *
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av_get_bytes_per_sample(ref->format) *
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av_get_channel_layout_nb_channels(ref->audio->channel_layout);
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if ((ret = av_new_packet(pkt, size)) < 0)
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return ret;
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memcpy(pkt->data, ref->data[0], size);
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}
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pkt->stream_index = stream_idx;
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pkt->pts = ref->pts;
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pkt->pos = ref->pos;
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pkt->size = size;
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avfilter_unref_buffer(ref);
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return size;
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}
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#define OFFSET(x) offsetof(LavfiContext, x)
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#define DEC AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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{ "graph", "Libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
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{ NULL },
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};
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static const AVClass lavfi_class = {
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.class_name = "lavfi indev",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVInputFormat ff_lavfi_demuxer = {
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.name = "lavfi",
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.long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
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.priv_data_size = sizeof(LavfiContext),
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.read_header = lavfi_read_header,
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.read_packet = lavfi_read_packet,
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.read_close = lavfi_read_close,
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.flags = AVFMT_NOFILE,
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.priv_class = &lavfi_class,
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};
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