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"
///////////////
// Constructor
LAVCVideoProvider::LAVCVideoProvider(wxString filename, wxString subfilename, double zoom) {
// Init variables
codecContext = NULL;
formatContext = NULL;
codec = NULL;
stream = NULL;
frame = NULL;
buffer = NULL;
bufferSize = 0;
vidStream = -1;
// 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");
// Allocate frame
frame = avcodec_alloc_frame();
}
// Catch errors
catch (...) {
Close();
throw;
}
}
///////////////
// Close video
void LAVCVideoProvider::Close() {
// Clean buffer
if (buffer) delete buffer;
buffer = NULL;
bufferSize = 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;
}
//////////////////
// Get next frame
void LAVCVideoProvider::GetNextFrame() {
static AVPacket packet;
static bool firstTime = true;
static int bytesRemaining = 0;
static uint8_t *rawdata;
int decoded;
int frameFinished;
// First call
if (firstTime) {
firstTime = false;
packet.data = NULL;
}
// Start processing packets
bool run = true;
while (run) {
// Current packet has more bytes
while (bytesRemaining > 0) {
// Decode
decoded = avcodec_decode_video(codecContext,frame,&frameFinished,rawdata,bytesRemaining);
// Error?
if (decoded < 0) throw _T("Error reading frame");
// Update counts
bytesRemaining -= decoded;
rawdata += decoded;
// Finished?
if (frameFinished) return;
}
// Get a packet
do {
// Free packet
if (packet.data != NULL) av_free_packet(&packet);
// Get new
int result = av_read_packet(formatContext,&packet);
if (result < 0) {
run = false;
break;
}
} while (packet.stream_index != vidStream);
// Get packet data
if (run) {
bytesRemaining = packet.size;
rawdata = packet.data;
}
}
// End of last pack
decoded = avcodec_decode_video(codecContext,frame,&frameFinished,rawdata,bytesRemaining);
if (packet.data != NULL) av_free_packet(&packet);
// Frame finished?
if (!frameFinished) throw _T("Unable to finish decoding frame");
}
///////////////////////////////
// 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 size = avpicture_get_size(format,w,h);
// Prepare buffer
if (!buffer || bufferSize != size) {
if (buffer) delete buffer;
buffer = new uint8_t[size];
bufferSize = size;
}
// Allocate RGB32 buffer
AVFrame *frameRGB = avcodec_alloc_frame();
avpicture_fill((AVPicture*) frameRGB, buffer, format, w, h);
// Convert to RGB32
img_convert((AVPicture*) frameRGB, format, (AVPicture*) source, 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) {
// Get frame
GetNextFrame();
// Bitmap
wxBitmap bmp = AVFrameToWX(frame);
// Return
return bmp;
}
//////////////////////
// Get frame as float
void LAVCVideoProvider::GetFloatFrame(float* Buffer, int n) {
}
////////////////
// Get position
int LAVCVideoProvider::GetPosition() {
return 0;
}
////////////////////////
// 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) {
}
////////////
// Set zoom
void LAVCVideoProvider::SetZoom(double zoom) {
}
////////////
// Get zoom
double LAVCVideoProvider::GetZoom() {
return 1;
}
/////////////
// Get width
int LAVCVideoProvider::GetWidth() {
return codecContext->coded_width;
}
//////////////
// Get height
int LAVCVideoProvider::GetHeight() {
return codecContext->coded_height;
}
//////////////////////
// Get original width
int LAVCVideoProvider::GetSourceWidth() {
return codecContext->coded_width;
}
///////////////////////
// Get original height
int LAVCVideoProvider::GetSourceHeight() {
return codecContext->coded_height;
}
#endif