Aegisub/core/video_provider_lavc.cpp

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// Copyright (c) 2006, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
///////////
// Headers
#ifdef USE_LAVC
#include <wx/wxprec.h>
#include "video_provider_lavc.h"
#include "utils.h"
#include "vfr.h"
///////////////
// Constructor
LAVCVideoProvider::LAVCVideoProvider(wxString filename, wxString subfilename) {
// Init variables
codecContext = NULL;
formatContext = NULL;
codec = NULL;
stream = NULL;
frame = NULL;
buffer1 = NULL;
buffer2 = NULL;
buffer1Size = 0;
buffer2Size = 0;
vidStream = -1;
zoom = 1.0;
validFrame = false;
// Register types
static bool avRegistered = false;
if (!avRegistered) {
av_register_all();
avRegistered = true;
}
// Load
LoadVideo(filename);
}
//////////////
// Destructor
LAVCVideoProvider::~LAVCVideoProvider() {
Close();
}
//////////////
// Load video
void LAVCVideoProvider::LoadVideo(wxString filename) {
// Close first
Close();
// Load
try {
// Open file
int result = 0;
result = av_open_input_file(&formatContext,filename.mb_str(wxConvLocal),NULL,0,NULL);
if (result != 0) throw _T("Failed opening file.");
// Get stream info
result = av_find_stream_info(formatContext);
if (result < 0) throw _T("Unable to read stream info");
// Find video stream
vidStream = -1;
codecContext = NULL;
for (int i=0;i<formatContext->nb_streams;i++) {
codecContext = formatContext->streams[i]->codec;
if (codecContext->codec_type == CODEC_TYPE_VIDEO) {
stream = formatContext->streams[i];
vidStream = i;
break;
}
}
if (vidStream == -1) throw _T("Could not find a video stream");
// Check length
if (stream->duration <= 0) throw _T("Returned invalid stream length");
// Find codec
codec = avcodec_find_decoder(codecContext->codec_id);
if (!codec) throw _T("Could not find suitable video decoder");
// Enable truncation
//if (codec->capabilities & CODEC_CAP_TRUNCATED) codecContext->flags |= CODEC_FLAG_TRUNCATED;
// Open codec
result = avcodec_open(codecContext,codec);
if (result < 0) throw _T("Failed to open video decoder");
// Set size
dar = double(GetSourceWidth()) / GetSourceHeight();
UpdateDisplaySize();
// Allocate frame
frame = avcodec_alloc_frame();
// Set frame
frameNumber = -1;
}
// Catch errors
catch (...) {
Close();
throw;
}
}
///////////////
// Close video
void LAVCVideoProvider::Close() {
// Clean buffers
if (buffer1) delete buffer1;
if (buffer2) delete buffer2;
buffer1 = NULL;
buffer2 = NULL;
buffer1Size = 0;
buffer2Size = 0;
// Clean frame
if (frame) av_free(frame);
frame = NULL;
// Close codec context
if (codec && codecContext) avcodec_close(codecContext);
codecContext = NULL;
codec = NULL;
// Close format context
if (formatContext) av_close_input_file(formatContext);
formatContext = NULL;
}
///////////////////////
// Update display size
void LAVCVideoProvider::UpdateDisplaySize() {
// Set
display_w = MID(16,int((GetSourceHeight() * zoom * dar)+0.5),4096);
display_h = MID(16,int((GetSourceHeight() * zoom)+0.5),4096);
}
//////////////////
// Get next frame
void LAVCVideoProvider::GetNextFrame() {
// Read packet
AVPacket packet;
while (av_read_frame(formatContext, &packet)>=0) {
// Check if packet is part of video stream
if(packet.stream_index == vidStream) {
// Decode frame
int frameFinished;
avcodec_decode_video(codecContext, frame, &frameFinished, packet.data, packet.size);
// Success?
if(frameFinished) {
// Set time
lastDecodeTime = packet.dts;
// Free packet
av_free_packet(&packet);
return;
}
}
}
av_free_packet(&packet);
}
///////////////////////////////
// Convert AVFrame to wxBitmap
wxBitmap LAVCVideoProvider::AVFrameToWX(AVFrame *source) {
// Get sizes
int w = codecContext->width;
int h = codecContext->height;
PixelFormat format = PIX_FMT_RGBA32;
unsigned int size1 = avpicture_get_size(codecContext->pix_fmt,display_w,display_h);
unsigned int size2 = avpicture_get_size(format,display_w,display_h);
// Prepare buffers
if (!buffer1 || buffer1Size != size1) {
if (buffer1) delete buffer1;
buffer1 = new uint8_t[size1];
buffer1Size = size1;
}
if (!buffer2 || buffer2Size != size2) {
if (buffer2) delete buffer2;
buffer2 = new uint8_t[size2];
buffer2Size = size2;
}
// Resize
AVFrame *resized;
bool resize = w != display_w || h != display_h;
if (resize) {
// Allocate
unsigned int resSize = avpicture_get_size(codecContext->pix_fmt,display_w,display_h);
resized = avcodec_alloc_frame();
avpicture_fill((AVPicture*) resized, buffer1, codecContext->pix_fmt, display_w, display_h);
// Resize
ImgReSampleContext *resampleContext = img_resample_init(display_w,display_h,w,h);
img_resample(resampleContext,(AVPicture*) resized,(AVPicture*) source);
img_resample_close(resampleContext);
// Set new w/h
w = display_w;
h = display_h;
}
else resized = source;
// Allocate RGB32 buffer
AVFrame *frameRGB = avcodec_alloc_frame();
avpicture_fill((AVPicture*) frameRGB, buffer2, format, w, h);
// Convert to RGB32
img_convert((AVPicture*) frameRGB, format, (AVPicture*) resized, codecContext->pix_fmt, w, h);
// Convert to wxBitmap
wxBitmap bmp((const char*) frameRGB->data[0],w,h,32);
return bmp;
}
////////////////
// Refresh subs
void LAVCVideoProvider::RefreshSubtitles() {
}
/////////////
// Get frame
wxBitmap LAVCVideoProvider::GetFrame(int n) {
// Return stored frame
n = MID(0,n,GetFrameCount()-1);
if (n == frameNumber) {
if (!validFrame) {
curFrame = AVFrameToWX(frame);
validFrame = true;
}
return curFrame;
}
// Following frame, just get it
if (n == frameNumber+1) {
GetNextFrame();
}
// Needs to seek
else {
// Get seek position
__int64 half = __int64(AV_TIME_BASE) * stream->r_frame_rate.den / stream->r_frame_rate.num / 2;
__int64 seekTo = __int64(n) * AV_TIME_BASE * stream->r_frame_rate.den / stream->r_frame_rate.num + stream->start_time;
if (seekTo > half) seekTo -= half;
else seekTo = 0;
__int64 finalPos = av_rescale(seekTo,stream->time_base.den,AV_TIME_BASE * __int64(stream->time_base.num));
// Seek to keyframe
int result = av_seek_frame(formatContext,vidStream,finalPos,0);
// Seek until final frame
GetNextFrame();
while (lastDecodeTime < n) {
GetNextFrame();
}
}
// Bitmap
wxBitmap bmp;
if (frame) bmp = AVFrameToWX(frame);
else bmp = wxBitmap(GetWidth(),GetHeight());
// Set current frame
validFrame = true;
curFrame = bmp;
frameNumber = n;
// Return
return curFrame;
}
//////////////////////
// Get frame as float
void LAVCVideoProvider::GetFloatFrame(float* Buffer, int n) {
}
////////////////
// Get position
int LAVCVideoProvider::GetPosition() {
return frameNumber;
}
////////////////////////
// Get number of frames
int LAVCVideoProvider::GetFrameCount() {
return stream->duration;
}
//////////////////
// Get frame rate
double LAVCVideoProvider::GetFPS() {
return double(stream->r_frame_rate.num) / double(stream->r_frame_rate.den);
}
////////////////////
// Set aspect ratio
void LAVCVideoProvider::SetDAR(double _dar) {
dar = _dar;
validFrame = false;
UpdateDisplaySize();
}
////////////
// Set zoom
void LAVCVideoProvider::SetZoom(double _zoom) {
zoom = _zoom;
validFrame = false;
UpdateDisplaySize();
}
////////////
// Get zoom
double LAVCVideoProvider::GetZoom() {
return zoom;
}
/////////////
// Get width
int LAVCVideoProvider::GetWidth() {
return display_w;
}
//////////////
// Get height
int LAVCVideoProvider::GetHeight() {
return display_h;
}
//////////////////////
// Get original width
int LAVCVideoProvider::GetSourceWidth() {
return codecContext->coded_width;
}
///////////////////////
// Get original height
int LAVCVideoProvider::GetSourceHeight() {
return codecContext->coded_height;
}
#endif