| /* |
| * filter graphs |
| * Copyright (c) 2008 Vitor Sessak |
| * Copyright (c) 2007 Bobby Bingham |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <ctype.h> |
| #include <string.h> |
| |
| #include "avfilter.h" |
| #include "avfiltergraph.h" |
| #include "internal.h" |
| |
| AVFilterGraph *avfilter_graph_alloc(void) |
| { |
| return av_mallocz(sizeof(AVFilterGraph)); |
| } |
| |
| void avfilter_graph_free(AVFilterGraph **graph) |
| { |
| if (!*graph) |
| return; |
| for (; (*graph)->filter_count > 0; (*graph)->filter_count--) |
| avfilter_free((*graph)->filters[(*graph)->filter_count - 1]); |
| av_freep(&(*graph)->scale_sws_opts); |
| av_freep(&(*graph)->filters); |
| av_freep(graph); |
| } |
| |
| int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter) |
| { |
| AVFilterContext **filters = av_realloc(graph->filters, |
| sizeof(AVFilterContext*) * (graph->filter_count+1)); |
| if (!filters) |
| return AVERROR(ENOMEM); |
| |
| graph->filters = filters; |
| graph->filters[graph->filter_count++] = filter; |
| |
| return 0; |
| } |
| |
| int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt, |
| const char *name, const char *args, void *opaque, |
| AVFilterGraph *graph_ctx) |
| { |
| int ret; |
| |
| if ((ret = avfilter_open(filt_ctx, filt, name)) < 0) |
| goto fail; |
| if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0) |
| goto fail; |
| if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0) |
| goto fail; |
| return 0; |
| |
| fail: |
| if (*filt_ctx) |
| avfilter_free(*filt_ctx); |
| *filt_ctx = NULL; |
| return ret; |
| } |
| |
| int ff_avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx) |
| { |
| AVFilterContext *filt; |
| int i, j; |
| |
| for (i = 0; i < graph->filter_count; i++) { |
| filt = graph->filters[i]; |
| |
| for (j = 0; j < filt->input_count; j++) { |
| if (!filt->inputs[j] || !filt->inputs[j]->src) { |
| av_log(log_ctx, AV_LOG_ERROR, |
| "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n", |
| filt->input_pads[j].name, filt->name, filt->filter->name); |
| return AVERROR(EINVAL); |
| } |
| } |
| |
| for (j = 0; j < filt->output_count; j++) { |
| if (!filt->outputs[j] || !filt->outputs[j]->dst) { |
| av_log(log_ctx, AV_LOG_ERROR, |
| "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n", |
| filt->output_pads[j].name, filt->name, filt->filter->name); |
| return AVERROR(EINVAL); |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| int ff_avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx) |
| { |
| AVFilterContext *filt; |
| int i, ret; |
| |
| for (i=0; i < graph->filter_count; i++) { |
| filt = graph->filters[i]; |
| |
| if (!filt->output_count) { |
| if ((ret = avfilter_config_links(filt))) |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name) |
| { |
| int i; |
| |
| for (i = 0; i < graph->filter_count; i++) |
| if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name)) |
| return graph->filters[i]; |
| |
| return NULL; |
| } |
| |
| static int query_formats(AVFilterGraph *graph, AVClass *log_ctx) |
| { |
| int i, j, ret; |
| int scaler_count = 0; |
| char inst_name[30]; |
| |
| /* ask all the sub-filters for their supported media formats */ |
| for (i = 0; i < graph->filter_count; i++) { |
| if (graph->filters[i]->filter->query_formats) |
| graph->filters[i]->filter->query_formats(graph->filters[i]); |
| else |
| avfilter_default_query_formats(graph->filters[i]); |
| } |
| |
| /* go through and merge as many format lists as possible */ |
| for (i = 0; i < graph->filter_count; i++) { |
| AVFilterContext *filter = graph->filters[i]; |
| |
| for (j = 0; j < filter->input_count; j++) { |
| AVFilterLink *link = filter->inputs[j]; |
| if (link && link->in_formats != link->out_formats) { |
| if (!avfilter_merge_formats(link->in_formats, |
| link->out_formats)) { |
| AVFilterContext *scale; |
| char scale_args[256]; |
| /* couldn't merge format lists. auto-insert scale filter */ |
| snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d", |
| scaler_count++); |
| snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts); |
| if ((ret = avfilter_graph_create_filter(&scale, avfilter_get_by_name("scale"), |
| inst_name, scale_args, NULL, graph)) < 0) |
| return ret; |
| if ((ret = avfilter_insert_filter(link, scale, 0, 0)) < 0) |
| return ret; |
| |
| scale->filter->query_formats(scale); |
| if (((link = scale-> inputs[0]) && |
| !avfilter_merge_formats(link->in_formats, link->out_formats)) || |
| ((link = scale->outputs[0]) && |
| !avfilter_merge_formats(link->in_formats, link->out_formats))) { |
| av_log(log_ctx, AV_LOG_ERROR, |
| "Impossible to convert between the formats supported by the filter " |
| "'%s' and the filter '%s'\n", link->src->name, link->dst->name); |
| return AVERROR(EINVAL); |
| } |
| } |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void pick_format(AVFilterLink *link) |
| { |
| if (!link || !link->in_formats) |
| return; |
| |
| link->in_formats->format_count = 1; |
| link->format = link->in_formats->formats[0]; |
| avfilter_formats_unref(&link->in_formats); |
| avfilter_formats_unref(&link->out_formats); |
| |
| if (link->type == AVMEDIA_TYPE_AUDIO) { |
| link->in_chlayouts->format_count = 1; |
| link->channel_layout = link->in_chlayouts->formats[0]; |
| avfilter_formats_unref(&link->in_chlayouts); |
| avfilter_formats_unref(&link->out_chlayouts); |
| } |
| |
| } |
| |
| static void pick_formats(AVFilterGraph *graph) |
| { |
| int i, j; |
| |
| for (i = 0; i < graph->filter_count; i++) { |
| AVFilterContext *filter = graph->filters[i]; |
| |
| for (j = 0; j < filter->input_count; j++) |
| pick_format(filter->inputs[j]); |
| for (j = 0; j < filter->output_count; j++) |
| pick_format(filter->outputs[j]); |
| } |
| } |
| |
| int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx) |
| { |
| int ret; |
| |
| /* find supported formats from sub-filters, and merge along links */ |
| if ((ret = query_formats(graph, log_ctx)) < 0) |
| return ret; |
| |
| /* Once everything is merged, it's possible that we'll still have |
| * multiple valid media format choices. We pick the first one. */ |
| pick_formats(graph); |
| |
| return 0; |
| } |
| |
| int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx) |
| { |
| int ret; |
| |
| if ((ret = ff_avfilter_graph_check_validity(graphctx, log_ctx))) |
| return ret; |
| if ((ret = ff_avfilter_graph_config_formats(graphctx, log_ctx))) |
| return ret; |
| if ((ret = ff_avfilter_graph_config_links(graphctx, log_ctx))) |
| return ret; |
| |
| return 0; |
| } |
