| /* |
| * 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", |
| .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 }}, |
| }; |