forked from mia/Aegisub
113 lines
3.7 KiB
C++
113 lines
3.7 KiB
C++
// Copyright (c) 2007, 2points
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// -----------------------------------------------------------------------------
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//
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// AEGISUB
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//
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// Website: http://aegisub.cellosoft.com
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// Contact: mailto:zeratul@cellosoft.com
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//
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///////////
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// Headers
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#include "lavc_keyframes.h"
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///////////////
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// Constructor
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LAVCKeyFrames::LAVCKeyFrames(const wxString& filename)
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: file(0), codecContext(0), codec(0), stream(0), frame(0),
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streamN(-1) {
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// Open LAVCFile
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file = LAVCFile::Create(filename);
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// Find video stream
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for (unsigned int i = 0; i < file->fctx->nb_streams; ++i) {
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codecContext = file->fctx->streams[i]->codec;
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codecContext->skip_frame = AVDISCARD_NONKEY;
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codecContext->workaround_bugs = FF_BUG_AUTODETECT;
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if (codecContext->codec_type == CODEC_TYPE_VIDEO) {
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stream = file->fctx->streams[i];
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stream->discard = AVDISCARD_NONKEY;
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streamN = i;
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break;
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}
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}
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if (streamN == -1) throw _T("Could not find a video stream");
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// Find codec
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codec = avcodec_find_decoder(codecContext->codec_id);
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if (!codec) throw _T("Could not find suitable video decoder");
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// Open codec
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int result = avcodec_open(codecContext, codec);
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if (result < 0) throw _T("Failed to open video decoder");
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// Allocate frame
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frame = avcodec_alloc_frame();
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}
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//////////////
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// Destructor
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LAVCKeyFrames::~LAVCKeyFrames() {
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if (frame) av_free((void*) frame);
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if (codec && codecContext) avcodec_close(codecContext);
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if (file) file->Release();
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}
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////////////////////////////
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// Parse file for keyframes
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wxArrayInt LAVCKeyFrames::GetKeyFrames() {
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wxArrayInt keyframes;
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AVPacket packet;
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register unsigned int frameN = 0; // Number of parsed frames
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while (av_read_frame(file->fctx, &packet) >= 0) {
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// Check if packet is part of video stream
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if (packet.stream_index == streamN) {
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// Increment number of passed frames
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++frameN;
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// Decode frame
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int frameFinished;
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avcodec_decode_video(codecContext, frame, &frameFinished, packet.data, packet.size);
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// Success?
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if(frameFinished) {
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if (frame->key_frame)
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// Aegisub starts counting at frame 0, so the result must be
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// parsed frames - 1
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keyframes.Add(frameN - 1);
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// Free packet
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av_free_packet(&packet);
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}
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}
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}
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return keyframes;
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}
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