mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-20 00:05:06 +02:00
517 lines
18 KiB
C
517 lines
18 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/bprint.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/file.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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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/avio_internal.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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char *graph_filename;
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char *dump_graph;
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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 *sink_eof;
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int *stream_sink_map;
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int *sink_stream_subcc_map;
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AVFrame *decoded_frame;
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int nb_sinks;
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AVPacket subcc_packet;
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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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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
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if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
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count++;
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}
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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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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
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if (!(desc->flags & AV_PIX_FMT_FLAG_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->sink_eof);
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av_freep(&lavfi->stream_sink_map);
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av_freep(&lavfi->sink_stream_subcc_map);
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av_freep(&lavfi->sinks);
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avfilter_graph_free(&lavfi->graph);
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av_frame_free(&lavfi->decoded_frame);
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return 0;
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}
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static int create_subcc_streams(AVFormatContext *avctx)
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{
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LavfiContext *lavfi = avctx->priv_data;
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AVStream *st;
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int stream_idx, sink_idx;
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for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {
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sink_idx = lavfi->stream_sink_map[stream_idx];
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if (lavfi->sink_stream_subcc_map[sink_idx]) {
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lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;
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if (!(st = avformat_new_stream(avctx, NULL)))
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return AVERROR(ENOMEM);
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st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
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st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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} else {
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lavfi->sink_stream_subcc_map[sink_idx] = -1;
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}
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}
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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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{
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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(AV_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_filename && lavfi->graph_str) {
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av_log(avctx, AV_LOG_ERROR,
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"Only one of the graph or graph_file options must be specified\n");
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FAIL(AVERROR(EINVAL));
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}
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if (lavfi->graph_filename) {
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AVBPrint graph_file_pb;
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AVIOContext *avio = NULL;
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AVDictionary *options = NULL;
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if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
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goto end;
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ret = avio_open2(&avio, lavfi->graph_filename, AVIO_FLAG_READ, &avctx->interrupt_callback, &options);
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av_dict_set(&options, "protocol_whitelist", NULL, 0);
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if (ret < 0)
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goto end;
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av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
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ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
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avio_closep(&avio);
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av_bprint_chars(&graph_file_pb, '\0', 1);
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if (!ret && !av_bprint_is_complete(&graph_file_pb))
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ret = AVERROR(ENOMEM);
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if (ret) {
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av_bprint_finalize(&graph_file_pb, NULL);
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goto end;
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}
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if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
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goto end;
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}
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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_ptr(lavfi->graph, lavfi->graph_str,
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&input_links, &output_links, avctx)) < 0)
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goto end;
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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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lavfi->nb_sinks = n;
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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->sink_eof = av_mallocz(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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if (!(lavfi->sink_stream_subcc_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 = 0, suffix = 0, use_subcc = 0;
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sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
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if (!suffix) {
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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 (inout->name[suffix]) {
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if (!strcmp(inout->name + suffix, "+subcc")) {
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use_subcc = 1;
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} else {
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av_log(avctx, AV_LOG_ERROR,
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"Invalid outpad suffix '%s'\n", inout->name);
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FAIL(AVERROR(EINVAL));
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}
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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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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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lavfi->sink_stream_subcc_map[i] = !!use_subcc;
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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_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
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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 = avfilter_pad_get_type(inout->filter_ctx->output_pads, inout->pad_idx);
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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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ret = avfilter_graph_create_filter(&sink, buffersink,
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inout->name, NULL,
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NULL, lavfi->graph);
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if (ret >= 0)
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ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
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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_U8,
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AV_SAMPLE_FMT_S16,
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AV_SAMPLE_FMT_S32,
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AV_SAMPLE_FMT_FLT,
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AV_SAMPLE_FMT_DBL, -1 };
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ret = avfilter_graph_create_filter(&sink, abuffersink,
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inout->name, NULL,
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NULL, lavfi->graph);
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if (ret >= 0)
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ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
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if (ret < 0)
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goto end;
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ret = av_opt_set_int(sink, "all_channel_counts", 1,
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AV_OPT_SEARCH_CHILDREN);
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if (ret < 0)
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goto end;
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} else {
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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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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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goto end;
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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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goto end;
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if (lavfi->dump_graph) {
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char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
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fputs(dump, stderr);
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fflush(stderr);
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av_free(dump);
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}
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/* fill each stream with the information in the corresponding sink */
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for (i = 0; i < lavfi->nb_sinks; i++) {
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AVFilterContext *sink = lavfi->sinks[lavfi->stream_sink_map[i]];
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AVRational time_base = av_buffersink_get_time_base(sink);
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AVStream *st = avctx->streams[i];
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st->codecpar->codec_type = av_buffersink_get_type(sink);
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avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
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if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_VIDEO) {
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st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
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st->codecpar->format = av_buffersink_get_format(sink);
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st->codecpar->width = av_buffersink_get_w(sink);
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st->codecpar->height = av_buffersink_get_h(sink);
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st ->sample_aspect_ratio =
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st->codecpar->sample_aspect_ratio = av_buffersink_get_sample_aspect_ratio(sink);
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avctx->probesize = FFMAX(avctx->probesize,
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av_buffersink_get_w(sink) * av_buffersink_get_h(sink) *
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av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(av_buffersink_get_format(sink))) *
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30);
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} else if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_AUDIO) {
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st->codecpar->codec_id = av_get_pcm_codec(av_buffersink_get_format(sink), -1);
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st->codecpar->channels = av_buffersink_get_channels(sink);
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st->codecpar->format = av_buffersink_get_format(sink);
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st->codecpar->sample_rate = av_buffersink_get_sample_rate(sink);
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st->codecpar->channel_layout = av_buffersink_get_channel_layout(sink);
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if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
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av_log(avctx, AV_LOG_ERROR,
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"Could not find PCM codec for sample format %s.\n",
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av_get_sample_fmt_name(av_buffersink_get_format(sink)));
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}
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}
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if ((ret = create_subcc_streams(avctx)) < 0)
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goto end;
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if (!(lavfi->decoded_frame = av_frame_alloc()))
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FAIL(AVERROR(ENOMEM));
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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 create_subcc_packet(AVFormatContext *avctx, AVFrame *frame,
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int sink_idx)
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{
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LavfiContext *lavfi = avctx->priv_data;
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AVFrameSideData *sd;
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int stream_idx, i, ret;
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if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
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return 0;
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for (i = 0; i < frame->nb_side_data; i++)
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if (frame->side_data[i]->type == AV_FRAME_DATA_A53_CC)
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break;
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if (i >= frame->nb_side_data)
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return 0;
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sd = frame->side_data[i];
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if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
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return ret;
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memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
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lavfi->subcc_packet.stream_index = stream_idx;
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lavfi->subcc_packet.pts = frame->pts;
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lavfi->subcc_packet.pos = frame->pkt_pos;
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return 0;
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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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AVFrame *frame = lavfi->decoded_frame;
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AVDictionary *frame_metadata;
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int ret, i;
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int size = 0;
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if (lavfi->subcc_packet.size) {
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*pkt = lavfi->subcc_packet;
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av_init_packet(&lavfi->subcc_packet);
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lavfi->subcc_packet.size = 0;
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lavfi->subcc_packet.data = NULL;
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return pkt->size;
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}
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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 < lavfi->nb_sinks; i++) {
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AVRational tb = av_buffersink_get_time_base(lavfi->sinks[i]);
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double d;
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int ret;
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if (lavfi->sink_eof[i])
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continue;
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ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
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AV_BUFFERSINK_FLAG_PEEK);
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if (ret == AVERROR_EOF) {
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ff_dlog(avctx, "EOF sink_idx:%d\n", i);
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lavfi->sink_eof[i] = 1;
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continue;
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} else if (ret < 0)
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return ret;
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d = av_rescale_q_rnd(frame->pts, tb, AV_TIME_BASE_Q, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
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ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
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av_frame_unref(frame);
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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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if (min_pts == DBL_MAX)
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return AVERROR_EOF;
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ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
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av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
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stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
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if (frame->width /* FIXME best way of testing a video */) {
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size = av_image_get_buffer_size(frame->format, frame->width, frame->height, 1);
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if ((ret = av_new_packet(pkt, size)) < 0)
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return ret;
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av_image_copy_to_buffer(pkt->data, size, (const uint8_t **)frame->data, frame->linesize,
|
|
frame->format, frame->width, frame->height, 1);
|
|
} else if (frame->channels /* FIXME test audio */) {
|
|
size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
|
|
frame->channels;
|
|
if ((ret = av_new_packet(pkt, size)) < 0)
|
|
return ret;
|
|
memcpy(pkt->data, frame->data[0], size);
|
|
}
|
|
|
|
frame_metadata = frame->metadata;
|
|
if (frame_metadata) {
|
|
uint8_t *metadata;
|
|
AVDictionaryEntry *e = NULL;
|
|
AVBPrint meta_buf;
|
|
|
|
av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
|
|
while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
|
|
av_bprintf(&meta_buf, "%s", e->key);
|
|
av_bprint_chars(&meta_buf, '\0', 1);
|
|
av_bprintf(&meta_buf, "%s", e->value);
|
|
av_bprint_chars(&meta_buf, '\0', 1);
|
|
}
|
|
if (!av_bprint_is_complete(&meta_buf) ||
|
|
!(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
|
|
meta_buf.len))) {
|
|
av_bprint_finalize(&meta_buf, NULL);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
memcpy(metadata, meta_buf.str, meta_buf.len);
|
|
av_bprint_finalize(&meta_buf, NULL);
|
|
}
|
|
|
|
if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
|
|
av_frame_unref(frame);
|
|
av_packet_unref(pkt);
|
|
return ret;
|
|
}
|
|
|
|
pkt->stream_index = stream_idx;
|
|
pkt->pts = frame->pts;
|
|
pkt->pos = frame->pkt_pos;
|
|
pkt->size = size;
|
|
av_frame_unref(frame);
|
|
return size;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(LavfiContext, x)
|
|
|
|
#define DEC AV_OPT_FLAG_DECODING_PARAM
|
|
|
|
static const AVOption options[] = {
|
|
{ "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
|
|
{ "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
|
|
{ "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_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,
|
|
.category = AV_CLASS_CATEGORY_DEVICE_INPUT,
|
|
};
|
|
|
|
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,
|
|
};
|