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ffmpeg / libavfilter / defaults.c @ 7fce481a

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/*
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 * Filter layer - default implementations
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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 "libavcore/imgutils.h"
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#include "avfilter.h"
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/* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */
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static void avfilter_default_free_buffer(AVFilterBuffer *ptr)
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{
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    av_free(ptr->data[0]);
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    av_free(ptr);
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}
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/* TODO: set the buffer's priv member to a context structure for the whole
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 * filter chain.  This will allow for a buffer pool instead of the constant
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 * alloc & free cycle currently implemented. */
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AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
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{
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    AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
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    AVFilterBufferRef *ref = av_mallocz(sizeof(AVFilterBufferRef));
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    int i, tempsize;
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    char *buf;
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    ref->buf   = pic;
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    ref->w     = w;
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    ref->h     = h;
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    /* make sure the buffer gets read permission or it's useless for output */
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    ref->perms = perms | AV_PERM_READ;
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    pic->refcount = 1;
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    ref->format   = link->format;
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    pic->free     = avfilter_default_free_buffer;
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    av_fill_image_linesizes(pic->linesize, ref->format, ref->w);
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    for (i=0; i<4;i++)
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        pic->linesize[i] = FFALIGN(pic->linesize[i], 16);
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    tempsize = av_fill_image_pointers(pic->data, ref->format, ref->h, NULL, pic->linesize);
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    buf = av_malloc(tempsize + 16); // +2 is needed for swscaler, +16 to be
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                                    // SIMD-friendly
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    av_fill_image_pointers(pic->data, ref->format, ref->h, buf, pic->linesize);
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    memcpy(ref->data,     pic->data,     4*sizeof(pic->data[0]));
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    memcpy(ref->linesize, pic->linesize, 4*sizeof(pic->linesize[0]));
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    return ref;
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}
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void avfilter_default_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
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{
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    AVFilterLink *out = NULL;
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    if(link->dst->output_count)
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        out = link->dst->outputs[0];
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    if(out) {
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        out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE, out->w, out->h);
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        avfilter_copy_buffer_ref_props(out->outpic, picref);
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        avfilter_start_frame(out, avfilter_ref_buffer(out->outpic, ~0));
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    }
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}
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void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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{
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    AVFilterLink *out = NULL;
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    if(link->dst->output_count)
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        out = link->dst->outputs[0];
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    if(out)
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        avfilter_draw_slice(out, y, h, slice_dir);
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}
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void avfilter_default_end_frame(AVFilterLink *link)
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{
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    AVFilterLink *out = NULL;
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    if(link->dst->output_count)
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        out = link->dst->outputs[0];
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    avfilter_unref_buffer(link->cur_pic);
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    link->cur_pic = NULL;
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    if(out) {
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        if(out->outpic) {
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            avfilter_unref_buffer(out->outpic);
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            out->outpic = NULL;
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        }
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        avfilter_end_frame(out);
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    }
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}
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/**
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 * default config_link() implementation for output video links to simplify
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 * the implementation of one input one output video filters */
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int avfilter_default_config_output_link(AVFilterLink *link)
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{
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    if(link->src->input_count && link->src->inputs[0]) {
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        link->w = link->src->inputs[0]->w;
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        link->h = link->src->inputs[0]->h;
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    } else {
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        /* XXX: any non-simple filter which would cause this branch to be taken
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         * really should implement its own config_props() for this link. */
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        return -1;
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    }
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    return 0;
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}
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/**
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 * A helper for query_formats() which sets all links to the same list of
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 * formats. If there are no links hooked to this filter, the list of formats is
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 * freed.
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 *
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 * FIXME: this will need changed for filters with a mix of pad types
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 * (video + audio, etc)
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 */
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void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
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{
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    int count = 0, i;
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    for(i = 0; i < ctx->input_count; i ++) {
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        if(ctx->inputs[i]) {
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            avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);
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            count ++;
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        }
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    }
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    for(i = 0; i < ctx->output_count; i ++) {
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        if(ctx->outputs[i]) {
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            avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);
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            count ++;
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        }
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    }
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    if(!count) {
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        av_free(formats->formats);
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        av_free(formats->refs);
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        av_free(formats);
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    }
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}
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int avfilter_default_query_formats(AVFilterContext *ctx)
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{
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    enum AVMediaType type = ctx->inputs [0] ? ctx->inputs [0]->type :
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                            ctx->outputs[0] ? ctx->outputs[0]->type :
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                            AVMEDIA_TYPE_VIDEO;
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    avfilter_set_common_formats(ctx, avfilter_all_formats(type));
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    return 0;
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}
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void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
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{
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    avfilter_start_frame(link->dst->outputs[0], picref);
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}
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void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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{
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    avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
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}
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void avfilter_null_end_frame(AVFilterLink *link)
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{
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    avfilter_end_frame(link->dst->outputs[0]);
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}
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AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
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{
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    return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
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}
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