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https://github.com/FFmpeg/FFmpeg.git
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c8dea81921
Intended for use with hardware frames for which rawvideo is not sufficient. Requires the trusted packet flag to be set - decoding fails if not to avoid security issues (the wrapped AVFrame can contain pointers to arbitrary data).
122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/*
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* AVFrame wrapper
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* Copyright (c) 2015 Luca Barbato
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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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* Simple wrapper to store an AVFrame and forward it as AVPacket.
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*/
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#include "avcodec.h"
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#include "internal.h"
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#include "libavutil/internal.h"
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#include "libavutil/frame.h"
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#include "libavutil/buffer.h"
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#include "libavutil/pixdesc.h"
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static void wrapped_avframe_release_buffer(void *unused, uint8_t *data)
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{
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AVFrame *frame = (AVFrame *)data;
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av_frame_free(&frame);
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}
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static int wrapped_avframe_encode(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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AVFrame *wrapped = av_frame_clone(frame);
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uint8_t *data;
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int size = sizeof(*wrapped) + AV_INPUT_BUFFER_PADDING_SIZE;
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if (!wrapped)
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return AVERROR(ENOMEM);
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data = av_mallocz(size);
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if (!data) {
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av_frame_free(&wrapped);
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return AVERROR(ENOMEM);
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}
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pkt->buf = av_buffer_create(data, size,
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wrapped_avframe_release_buffer, NULL,
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AV_BUFFER_FLAG_READONLY);
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if (!pkt->buf) {
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av_frame_free(&wrapped);
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av_freep(&data);
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return AVERROR(ENOMEM);
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}
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av_frame_move_ref((AVFrame*)data, wrapped);
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av_frame_free(&wrapped);
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pkt->data = data;
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pkt->size = sizeof(*wrapped);
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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return 0;
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}
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static int wrapped_avframe_decode(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *pkt)
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{
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AVFrame *in, *out;
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int err;
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if (!(pkt->flags & AV_PKT_FLAG_TRUSTED)) {
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// This decoder is not usable with untrusted input.
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return AVERROR(EPERM);
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}
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if (pkt->size < sizeof(AVFrame))
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return AVERROR(EINVAL);
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in = (AVFrame*)pkt->data;
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out = data;
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err = ff_decode_frame_props(avctx, out);
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if (err < 0)
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return err;
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av_frame_move_ref(out, in);
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*got_frame = 1;
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return 0;
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}
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AVCodec ff_wrapped_avframe_encoder = {
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.name = "wrapped_avframe",
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.long_name = NULL_IF_CONFIG_SMALL("AVFrame to AVPacket passthrough"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_WRAPPED_AVFRAME,
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.encode2 = wrapped_avframe_encode,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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AVCodec ff_wrapped_avframe_decoder = {
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.name = "wrapped_avframe",
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.long_name = NULL_IF_CONFIG_SMALL("AVPacket to AVFrame passthrough"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_WRAPPED_AVFRAME,
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.decode = wrapped_avframe_decode,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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