mirror of https://github.com/odrling/Aegisub
401 lines
9.3 KiB
C++
401 lines
9.3 KiB
C++
// Copyright (c) 2006, Rodrigo Braz Monteiro
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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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#ifdef USE_LAVC
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#include <wx/wxprec.h>
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#include "video_provider_lavc.h"
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#include "utils.h"
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#include "vfr.h"
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///////////////
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// Constructor
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LAVCVideoProvider::LAVCVideoProvider(wxString filename, wxString subfilename) {
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// Init variables
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codecContext = NULL;
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formatContext = NULL;
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codec = NULL;
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stream = NULL;
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frame = NULL;
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buffer1 = NULL;
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buffer2 = NULL;
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buffer1Size = 0;
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buffer2Size = 0;
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vidStream = -1;
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zoom = 1.0;
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validFrame = false;
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// Register types
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static bool avRegistered = false;
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if (!avRegistered) {
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av_register_all();
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avRegistered = true;
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}
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// Load
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LoadVideo(filename);
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}
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//////////////
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// Destructor
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LAVCVideoProvider::~LAVCVideoProvider() {
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Close();
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}
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//////////////
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// Load video
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void LAVCVideoProvider::LoadVideo(wxString filename) {
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// Close first
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Close();
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// Load
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try {
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// Open file
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int result = 0;
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result = av_open_input_file(&formatContext,filename.mb_str(wxConvLocal),NULL,0,NULL);
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if (result != 0) throw _T("Failed opening file.");
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// Get stream info
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result = av_find_stream_info(formatContext);
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if (result < 0) throw _T("Unable to read stream info");
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// Find video stream
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vidStream = -1;
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codecContext = NULL;
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for (int i=0;i<formatContext->nb_streams;i++) {
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codecContext = formatContext->streams[i]->codec;
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if (codecContext->codec_type == CODEC_TYPE_VIDEO) {
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stream = formatContext->streams[i];
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vidStream = i;
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break;
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}
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}
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if (vidStream == -1) throw _T("Could not find a video stream");
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// Check length
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if (stream->duration <= 0) throw _T("Returned invalid stream length");
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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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// Enable truncation
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//if (codec->capabilities & CODEC_CAP_TRUNCATED) codecContext->flags |= CODEC_FLAG_TRUNCATED;
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// Open codec
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result = avcodec_open(codecContext,codec);
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if (result < 0) throw _T("Failed to open video decoder");
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// Set size
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dar = double(GetSourceWidth()) / GetSourceHeight();
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UpdateDisplaySize();
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// Allocate frame
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frame = avcodec_alloc_frame();
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// Set frame
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frameNumber = -1;
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}
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// Catch errors
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catch (...) {
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Close();
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throw;
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}
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}
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///////////////
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// Close video
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void LAVCVideoProvider::Close() {
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// Clean buffers
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if (buffer1) delete buffer1;
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if (buffer2) delete buffer2;
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buffer1 = NULL;
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buffer2 = NULL;
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buffer1Size = 0;
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buffer2Size = 0;
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// Clean frame
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if (frame) av_free(frame);
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frame = NULL;
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// Close codec context
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if (codec && codecContext) avcodec_close(codecContext);
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codecContext = NULL;
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codec = NULL;
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// Close format context
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if (formatContext) av_close_input_file(formatContext);
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formatContext = NULL;
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}
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///////////////////////
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// Update display size
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void LAVCVideoProvider::UpdateDisplaySize() {
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// Set
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display_w = MID(16,int((GetSourceHeight() * zoom * dar)+0.5),4096);
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display_h = MID(16,int((GetSourceHeight() * zoom)+0.5),4096);
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}
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//////////////////
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// Get next frame
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void LAVCVideoProvider::GetNextFrame() {
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// Read packet
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AVPacket packet;
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while (av_read_frame(formatContext, &packet)>=0) {
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// Check if packet is part of video stream
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if(packet.stream_index == vidStream) {
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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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// Set time
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lastDecodeTime = packet.dts;
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// Free packet
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av_free_packet(&packet);
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return;
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}
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}
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}
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av_free_packet(&packet);
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}
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///////////////////////////////
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// Convert AVFrame to wxBitmap
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wxBitmap LAVCVideoProvider::AVFrameToWX(AVFrame *source) {
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// Get sizes
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int w = codecContext->width;
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int h = codecContext->height;
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PixelFormat format = PIX_FMT_RGBA32;
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unsigned int size1 = avpicture_get_size(codecContext->pix_fmt,display_w,display_h);
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unsigned int size2 = avpicture_get_size(format,display_w,display_h);
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// Prepare buffers
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if (!buffer1 || buffer1Size != size1) {
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if (buffer1) delete buffer1;
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buffer1 = new uint8_t[size1];
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buffer1Size = size1;
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}
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if (!buffer2 || buffer2Size != size2) {
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if (buffer2) delete buffer2;
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buffer2 = new uint8_t[size2];
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buffer2Size = size2;
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}
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// Resize
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AVFrame *resized;
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bool resize = w != display_w || h != display_h;
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if (resize) {
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// Allocate
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unsigned int resSize = avpicture_get_size(codecContext->pix_fmt,display_w,display_h);
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resized = avcodec_alloc_frame();
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avpicture_fill((AVPicture*) resized, buffer1, codecContext->pix_fmt, display_w, display_h);
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// Resize
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ImgReSampleContext *resampleContext = img_resample_init(display_w,display_h,w,h);
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img_resample(resampleContext,(AVPicture*) resized,(AVPicture*) source);
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img_resample_close(resampleContext);
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// Set new w/h
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w = display_w;
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h = display_h;
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}
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else resized = source;
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// Allocate RGB32 buffer
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AVFrame *frameRGB = avcodec_alloc_frame();
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avpicture_fill((AVPicture*) frameRGB, buffer2, format, w, h);
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// Convert to RGB32
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img_convert((AVPicture*) frameRGB, format, (AVPicture*) resized, codecContext->pix_fmt, w, h);
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// Convert to wxBitmap
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wxBitmap bmp((const char*) frameRGB->data[0],w,h,32);
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return bmp;
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}
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////////////////
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// Refresh subs
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void LAVCVideoProvider::RefreshSubtitles() {
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}
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/////////////
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// Get frame
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wxBitmap LAVCVideoProvider::GetFrame(int n) {
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// Return stored frame
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n = MID(0,n,GetFrameCount()-1);
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if (n == frameNumber) {
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if (!validFrame) {
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curFrame = AVFrameToWX(frame);
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validFrame = true;
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}
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return curFrame;
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}
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// Following frame, just get it
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if (n == frameNumber+1) {
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GetNextFrame();
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}
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// Needs to seek
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else {
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// Get seek position
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__int64 half = __int64(AV_TIME_BASE) * stream->r_frame_rate.den / stream->r_frame_rate.num / 2;
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__int64 seekTo = __int64(n) * AV_TIME_BASE * stream->r_frame_rate.den / stream->r_frame_rate.num + stream->start_time;
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if (seekTo > half) seekTo -= half;
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else seekTo = 0;
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__int64 finalPos = av_rescale(seekTo,stream->time_base.den,AV_TIME_BASE * __int64(stream->time_base.num));
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// Seek to keyframe
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int result = av_seek_frame(formatContext,vidStream,finalPos,0);
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// Seek until final frame
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GetNextFrame();
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while (lastDecodeTime < n) {
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GetNextFrame();
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}
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}
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// Bitmap
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wxBitmap bmp;
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if (frame) bmp = AVFrameToWX(frame);
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else bmp = wxBitmap(GetWidth(),GetHeight());
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// Set current frame
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validFrame = true;
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curFrame = bmp;
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frameNumber = n;
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// Return
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return curFrame;
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}
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//////////////////////
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// Get frame as float
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void LAVCVideoProvider::GetFloatFrame(float* Buffer, int n) {
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}
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////////////////
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// Get position
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int LAVCVideoProvider::GetPosition() {
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return frameNumber;
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}
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////////////////////////
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// Get number of frames
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int LAVCVideoProvider::GetFrameCount() {
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return stream->duration;
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}
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//////////////////
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// Get frame rate
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double LAVCVideoProvider::GetFPS() {
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return double(stream->r_frame_rate.num) / double(stream->r_frame_rate.den);
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}
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////////////////////
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// Set aspect ratio
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void LAVCVideoProvider::SetDAR(double _dar) {
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dar = _dar;
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validFrame = false;
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UpdateDisplaySize();
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}
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////////////
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// Set zoom
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void LAVCVideoProvider::SetZoom(double _zoom) {
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zoom = _zoom;
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validFrame = false;
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UpdateDisplaySize();
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}
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////////////
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// Get zoom
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double LAVCVideoProvider::GetZoom() {
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return zoom;
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}
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/////////////
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// Get width
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int LAVCVideoProvider::GetWidth() {
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return display_w;
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}
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//////////////
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// Get height
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int LAVCVideoProvider::GetHeight() {
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return display_h;
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}
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//////////////////////
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// Get original width
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int LAVCVideoProvider::GetSourceWidth() {
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return codecContext->coded_width;
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}
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///////////////////////
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// Get original height
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int LAVCVideoProvider::GetSourceHeight() {
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return codecContext->coded_height;
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}
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#endif
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