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373 lines
13 KiB
373 lines
13 KiB
/* |
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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 "libavutil/audioconvert.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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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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} 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->sink_eof); |
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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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{ |
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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("ffbuffersink"); |
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abuffersink = avfilter_get_by_name("ffabuffersink"); |
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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->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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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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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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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_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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AVABufferSinkParams *abuffersink_params = av_abuffersink_params_alloc(); |
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abuffersink_params->sample_fmts = sample_fmts; |
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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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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 < 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 = AV_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 = av_get_pcm_codec(link->format, -1); |
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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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if (st->codec->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(link->format)); |
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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; |
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if (lavfi->sink_eof[i]) |
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continue; |
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ret = av_buffersink_get_buffer_ref(lavfi->sinks[i], |
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&ref, AV_BUFFERSINK_FLAG_PEEK); |
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if (ret == AVERROR_EOF) { |
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av_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(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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if (min_pts == DBL_MAX) |
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return AVERROR_EOF; |
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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", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
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{ "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), 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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