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https://git.videolan.org/git/ffmpeg.git
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![Mina Nagy Zaki](/assets/img/avatar_default.png)
Behaviour has been changed to fail negotiation if fields have been left empty. Patch was originally based on a patch by Hemanth. Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
359 lines
12 KiB
C
359 lines
12 KiB
C
/*
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* filter graphs
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* Copyright (c) 2008 Vitor Sessak
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* Copyright (c) 2007 Bobby Bingham
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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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#include <ctype.h>
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#include <string.h>
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#include "libavutil/audioconvert.h"
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#include "avfilter.h"
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#include "avfiltergraph.h"
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#include "internal.h"
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AVFilterGraph *avfilter_graph_alloc(void)
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{
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return av_mallocz(sizeof(AVFilterGraph));
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}
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void avfilter_graph_free(AVFilterGraph **graph)
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{
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if (!*graph)
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return;
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for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
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avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
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av_freep(&(*graph)->scale_sws_opts);
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av_freep(&(*graph)->filters);
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av_freep(graph);
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}
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int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
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{
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AVFilterContext **filters = av_realloc(graph->filters,
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sizeof(AVFilterContext*) * (graph->filter_count+1));
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if (!filters)
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return AVERROR(ENOMEM);
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graph->filters = filters;
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graph->filters[graph->filter_count++] = filter;
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return 0;
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}
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int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
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const char *name, const char *args, void *opaque,
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AVFilterGraph *graph_ctx)
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{
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int ret;
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if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
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goto fail;
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if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
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goto fail;
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if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
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goto fail;
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return 0;
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fail:
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if (*filt_ctx)
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avfilter_free(*filt_ctx);
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*filt_ctx = NULL;
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return ret;
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}
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int ff_avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
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{
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AVFilterContext *filt;
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int i, j;
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for (i = 0; i < graph->filter_count; i++) {
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filt = graph->filters[i];
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for (j = 0; j < filt->input_count; j++) {
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if (!filt->inputs[j] || !filt->inputs[j]->src) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
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filt->input_pads[j].name, filt->name, filt->filter->name);
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return AVERROR(EINVAL);
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}
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}
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for (j = 0; j < filt->output_count; j++) {
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if (!filt->outputs[j] || !filt->outputs[j]->dst) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
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filt->output_pads[j].name, filt->name, filt->filter->name);
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return AVERROR(EINVAL);
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}
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}
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}
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return 0;
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}
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int ff_avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
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{
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AVFilterContext *filt;
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int i, ret;
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for (i=0; i < graph->filter_count; i++) {
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filt = graph->filters[i];
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if (!filt->output_count) {
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if ((ret = avfilter_config_links(filt)))
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return ret;
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}
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}
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return 0;
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}
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AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
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{
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int i;
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for (i = 0; i < graph->filter_count; i++)
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if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
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return graph->filters[i];
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return NULL;
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}
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static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
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const char *filt_name, const char *filt_args)
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{
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static int auto_count = 0, ret;
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char inst_name[32];
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AVFilterContext *filt_ctx;
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snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
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filt_name, auto_count++);
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if ((ret = avfilter_graph_create_filter(&filt_ctx,
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avfilter_get_by_name(filt_name),
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inst_name, filt_args, NULL, graph)) < 0)
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return ret;
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if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
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return ret;
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filt_ctx->filter->query_formats(filt_ctx);
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if ( ((link = filt_ctx-> inputs[0]) &&
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!avfilter_merge_formats(link->in_formats, link->out_formats)) ||
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((link = filt_ctx->outputs[0]) &&
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!avfilter_merge_formats(link->in_formats, link->out_formats))
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) {
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av_log(NULL, AV_LOG_ERROR,
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"Impossible to convert between the formats supported by the filter "
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"'%s' and the filter '%s'\n", link->src->name, link->dst->name);
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return AVERROR(EINVAL);
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}
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if (link->type == AVMEDIA_TYPE_AUDIO &&
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(((link = filt_ctx-> inputs[0]) &&
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(!avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts) ||
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!avfilter_merge_formats(link->in_packing, link->out_packing))) ||
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((link = filt_ctx->outputs[0]) &&
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(!avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts) ||
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!avfilter_merge_formats(link->in_packing, link->out_packing))))
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) {
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av_log(NULL, AV_LOG_ERROR,
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"Impossible to convert between the channel layouts/packing formats supported by the filter "
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"'%s' and the filter '%s'\n", link->src->name, link->dst->name);
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
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{
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int i, j, ret;
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char filt_args[128];
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/* ask all the sub-filters for their supported media formats */
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for (i = 0; i < graph->filter_count; i++) {
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if (graph->filters[i]->filter->query_formats)
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graph->filters[i]->filter->query_formats(graph->filters[i]);
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else
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avfilter_default_query_formats(graph->filters[i]);
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}
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/* go through and merge as many format lists as possible */
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for (i = 0; i < graph->filter_count; i++) {
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AVFilterContext *filter = graph->filters[i];
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for (j = 0; j < filter->input_count; j++) {
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AVFilterLink *link = filter->inputs[j];
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if (!link) continue;
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if (!link->in_formats || !link->out_formats)
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return AVERROR(EINVAL);
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if (link->type == AVMEDIA_TYPE_VIDEO &&
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!avfilter_merge_formats(link->in_formats, link->out_formats)) {
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/* couldn't merge format lists, auto-insert scale filter */
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snprintf(filt_args, sizeof(filt_args), "0:0:%s",
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graph->scale_sws_opts);
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if (ret = insert_conv_filter(graph, link, "scale", filt_args))
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return ret;
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}
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else if (link->type == AVMEDIA_TYPE_AUDIO) {
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if (!link->in_chlayouts || !link->out_chlayouts ||
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!link->in_packing || !link->out_packing)
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return AVERROR(EINVAL);
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if (!avfilter_merge_formats(link->in_formats, link->out_formats) ||
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!avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts) ||
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!avfilter_merge_formats(link->in_packing, link->out_packing))
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if (ret = insert_conv_filter(graph, link, "aconvert", NULL))
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return ret;
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}
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}
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}
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return 0;
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}
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static void pick_format(AVFilterLink *link)
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{
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if (!link || !link->in_formats)
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return;
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link->in_formats->format_count = 1;
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link->format = link->in_formats->formats[0];
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avfilter_formats_unref(&link->in_formats);
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avfilter_formats_unref(&link->out_formats);
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if (link->type == AVMEDIA_TYPE_AUDIO) {
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link->in_chlayouts->format_count = 1;
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link->channel_layout = link->in_chlayouts->formats[0];
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avfilter_formats_unref(&link->in_chlayouts);
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avfilter_formats_unref(&link->out_chlayouts);
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link->in_packing->format_count = 1;
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link->planar = link->in_packing->formats[0] == AVFILTER_PLANAR;
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avfilter_formats_unref(&link->in_packing);
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avfilter_formats_unref(&link->out_packing);
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}
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}
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static void pick_formats(AVFilterGraph *graph)
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{
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int i, j;
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for (i = 0; i < graph->filter_count; i++) {
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AVFilterContext *filter = graph->filters[i];
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for (j = 0; j < filter->input_count; j++)
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pick_format(filter->inputs[j]);
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for (j = 0; j < filter->output_count; j++)
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pick_format(filter->outputs[j]);
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}
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}
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int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
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{
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int ret;
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/* find supported formats from sub-filters, and merge along links */
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if ((ret = query_formats(graph, log_ctx)) < 0)
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return ret;
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/* Once everything is merged, it's possible that we'll still have
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* multiple valid media format choices. We pick the first one. */
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pick_formats(graph);
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return 0;
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}
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int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
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{
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int ret;
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if ((ret = ff_avfilter_graph_check_validity(graphctx, log_ctx)))
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return ret;
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if ((ret = ff_avfilter_graph_config_formats(graphctx, log_ctx)))
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return ret;
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if ((ret = ff_avfilter_graph_config_links(graphctx, log_ctx)))
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return ret;
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return 0;
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}
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int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
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{
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int i, r = AVERROR(ENOSYS);
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if(!graph)
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return r;
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if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
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r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
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if(r != AVERROR(ENOSYS))
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return r;
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}
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if(res_len && res)
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res[0]= 0;
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for (i = 0; i < graph->filter_count; i++) {
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AVFilterContext *filter = graph->filters[i];
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if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
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r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
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if(r != AVERROR(ENOSYS)) {
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if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
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return r;
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}
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}
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}
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return r;
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}
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int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
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{
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int i;
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if(!graph)
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return 0;
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for (i = 0; i < graph->filter_count; i++) {
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AVFilterContext *filter = graph->filters[i];
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if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
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AVFilterCommand **que = &filter->command_queue, *next;
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while(*que && (*que)->time <= ts)
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que = &(*que)->next;
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next= *que;
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*que= av_mallocz(sizeof(AVFilterCommand));
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(*que)->command = av_strdup(command);
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(*que)->arg = av_strdup(arg);
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(*que)->time = ts;
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(*que)->flags = flags;
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(*que)->next = next;
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if(flags & AVFILTER_CMD_FLAG_ONE)
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return 0;
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}
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}
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return 0;
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}
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