mirror of https://github.com/FFmpeg/FFmpeg.git
Also add the public interface libavfilter/vsink_buffer.h.pull/2/head
Stefano Sabatini
14 years ago
parent
e89ba76a59
commit
44f669e7bc
12 changed files with 199 additions and 99 deletions
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/*
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* Copyright (c) 2011 Stefano Sabatini |
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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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/**
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* @file |
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* buffer video sink |
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*/ |
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#include "avfilter.h" |
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#include "vsink_buffer.h" |
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typedef struct { |
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AVFilterBufferRef *picref; ///< cached picref
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enum PixelFormat *pix_fmts; ///< accepted pixel formats, must be terminated with -1
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} BufferSinkContext; |
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
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{ |
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BufferSinkContext *buf = ctx->priv; |
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if (!opaque) { |
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av_log(ctx, AV_LOG_ERROR, "No opaque field provided, which is required.\n"); |
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return AVERROR(EINVAL); |
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} |
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buf->pix_fmts = opaque; |
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return 0; |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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BufferSinkContext *buf = ctx->priv; |
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if (buf->picref) |
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avfilter_unref_buffer(buf->picref); |
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buf->picref = NULL; |
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} |
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static void end_frame(AVFilterLink *inlink) |
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{ |
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BufferSinkContext *buf = inlink->dst->priv; |
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if (buf->picref) /* drop the last cached frame */ |
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avfilter_unref_buffer(buf->picref); |
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buf->picref = inlink->cur_buf; |
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} |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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BufferSinkContext *buf = ctx->priv; |
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avfilter_set_common_formats(ctx, avfilter_make_format_list(buf->pix_fmts)); |
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return 0; |
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} |
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int av_vsink_buffer_get_video_buffer_ref(AVFilterContext *ctx, |
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AVFilterBufferRef **picref, int flags) |
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{ |
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BufferSinkContext *buf = ctx->priv; |
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AVFilterLink *inlink = ctx->inputs[0]; |
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int ret; |
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*picref = NULL; |
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/* no picref available, fetch it from the filterchain */ |
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if (!buf->picref) { |
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if ((ret = avfilter_request_frame(inlink)) < 0) |
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return ret; |
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} |
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if (!buf->picref) |
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return AVERROR(EINVAL); |
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*picref = buf->picref; |
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if (!(flags & AV_VSINK_BUF_FLAG_PEEK)) |
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buf->picref = NULL; |
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return 0; |
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} |
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AVFilter avfilter_vsink_buffersink = { |
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.name = "buffersink", |
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.priv_size = sizeof(BufferSinkContext), |
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.init = init, |
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.uninit = uninit, |
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.query_formats = query_formats, |
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.inputs = (AVFilterPad[]) {{ .name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.end_frame = end_frame, |
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.min_perms = AV_PERM_READ, }, |
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{ .name = NULL }}, |
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.outputs = (AVFilterPad[]) {{ .name = NULL }}, |
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}; |
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@ -0,0 +1,47 @@ |
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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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#ifndef AVFILTER_VSINK_BUFFER_H |
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#define AVFILTER_VSINK_BUFFER_H |
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/**
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* @file |
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* memory buffer sink API for video |
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*/ |
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#include "avfilter.h" |
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/**
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* Tell av_vsink_buffer_get_video_buffer_ref() to read the picref, but not |
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* remove it from the buffer. This is useful if you need only to read |
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* the picref, without to fetch it. |
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*/ |
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#define AV_VSINK_BUF_FLAG_PEEK 1 |
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/**
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* Get a video buffer data from buffer_sink and put it in picref. |
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* |
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* @param buffer_sink pointer to a buffer sink context |
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* @param flags a combination of AV_VSINK_BUF_FLAG_* flags |
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* @return >= 0 in case of success, a negative AVERROR code in case of |
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* failure |
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*/ |
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int av_vsink_buffer_get_video_buffer_ref(AVFilterContext *buffer_sink, |
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AVFilterBufferRef **picref, int flags); |
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#endif /* AVFILTER_VSINK_BUFFER_H */ |
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