256 lines
8.2 KiB
C
256 lines
8.2 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 "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 query_formats(AVFilterGraph *graph, AVClass *log_ctx)
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{
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int i, j, ret;
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int scaler_count = 0;
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char inst_name[30];
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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 && link->in_formats != link->out_formats) {
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if (!avfilter_merge_formats(link->in_formats,
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link->out_formats)) {
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AVFilterContext *scale;
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char scale_args[256];
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/* couldn't merge format lists. auto-insert scale filter */
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snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
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scaler_count++);
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snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
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if ((ret = avfilter_graph_create_filter(&scale, avfilter_get_by_name("scale"),
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inst_name, scale_args, NULL, graph)) < 0)
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return ret;
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if ((ret = avfilter_insert_filter(link, scale, 0, 0)) < 0)
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return ret;
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scale->filter->query_formats(scale);
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if (((link = scale-> inputs[0]) &&
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!avfilter_merge_formats(link->in_formats, link->out_formats)) ||
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((link = scale->outputs[0]) &&
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!avfilter_merge_formats(link->in_formats, link->out_formats))) {
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av_log(log_ctx, 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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}
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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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