/* * Copyright (c) 2011 Stefano Sabatini * * 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 */ /** * @file * buffer video sink */ #include "avfilter.h"#include "vsink_buffer.h" typedef struct {    AVFilterBufferRef *picref;   ///< cached picref    enum PixelFormat *pix_fmts;  ///< accepted pixel formats, must be terminated with -1} BufferSinkContext; static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque){    BufferSinkContext *buf = ctx->priv;     if (!opaque) {        av_log(ctx, AV_LOG_ERROR, "No opaque field provided, which is required.\n");        return AVERROR(EINVAL);    }     buf->pix_fmts = opaque;    return 0;} static av_cold void uninit(AVFilterContext *ctx){    BufferSinkContext *buf = ctx->priv;     if (buf->picref)        avfilter_unref_buffer(buf->picref);    buf->picref = NULL;} static void end_frame(AVFilterLink *inlink){    BufferSinkContext *buf = inlink->dst->priv;     if (buf->picref)            /* drop the last cached frame */        avfilter_unref_buffer(buf->picref);    buf->picref = inlink->cur_buf;} static int query_formats(AVFilterContext *ctx){    BufferSinkContext *buf = ctx->priv;     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(buf->pix_fmts));    return 0;} int av_vsink_buffer_get_video_buffer_ref(AVFilterContext *ctx,                                         AVFilterBufferRef **picref, int flags){    BufferSinkContext *buf = ctx->priv;    AVFilterLink *inlink = ctx->inputs[0];    int ret;    *picref = NULL;     /* no picref available, fetch it from the filterchain */    if (!buf->picref) {        if ((ret = avfilter_request_frame(inlink)) < 0)            return ret;    }     if (!buf->picref)        return AVERROR(EINVAL);     *picref = buf->picref;    if (!(flags & AV_VSINK_BUF_FLAG_PEEK))        buf->picref = NULL;     return 0;} AVFilter avfilter_vsink_buffersink = {    .name      = "buffersink",    .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),    .priv_size = sizeof(BufferSinkContext),    .init      = init,    .uninit    = uninit,     .query_formats = query_formats,     .inputs    = (AVFilterPad[]) {{ .name          = "default",                                    .type          = AVMEDIA_TYPE_VIDEO,                                    .end_frame     = end_frame,                                    .min_perms     = AV_PERM_READ, },                                  { .name = NULL }},    .outputs   = (AVFilterPad[]) {{ .name = NULL }},};