Aegisub/aegisub/video_provider_lavc.cpp

398 lines
9.9 KiB
C++

// Copyright (c) 2006-2007, 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 WITH_FFMPEG
#ifdef WIN32
#define EMULATE_INTTYPES
#define __STDC_CONSTANT_MACROS 1
#include <stdint.h>
#endif /* WIN32 */
#include <wx/wxprec.h>
#include <wx/image.h>
#include <algorithm>
#include <vector>
#include "video_provider_lavc.h"
#include "mkv_wrap.h"
#include "lavc_file.h"
#include "utils.h"
#include "vfr.h"
#include "ass_file.h"
#include "lavc_keyframes.h"
#include "video_context.h"
#include "options.h"
///////////////
// Constructor
LAVCVideoProvider::LAVCVideoProvider(Aegisub::String filename,double fps) {
// Init variables
codecContext = NULL;
lavcfile = NULL;
codec = NULL;
stream = NULL;
frame = NULL;
frameRGB = NULL;
bufferRGB = NULL;
sws_context = NULL;
buffer1 = NULL;
buffer2 = NULL;
buffer1Size = 0;
buffer2Size = 0;
vidStream = -1;
validFrame = false;
framesData.clear();
// Load
LoadVideo(filename,fps);
}
//////////////
// Destructor
LAVCVideoProvider::~LAVCVideoProvider() {
Close();
}
//////////////
// Load video
void LAVCVideoProvider::LoadVideo(Aegisub::String filename, double fps) {
// Close first
Close();
lavcfile = LAVCFile::Create(filename);
// Load
try {
int result = 0;
// Find video stream
vidStream = -1;
codecContext = NULL;
for (int i=0; i < (int)lavcfile->fctx->nb_streams; i++) {
codecContext = lavcfile->fctx->streams[i]->codec;
if (codecContext->codec_type == CODEC_TYPE_VIDEO) {
stream = lavcfile->fctx->streams[i];
vidStream = i;
break;
}
}
if (vidStream == -1) throw _T("ffmpeg video provider: Could not find a video stream");
// Find codec
codec = avcodec_find_decoder(codecContext->codec_id);
if (!codec) throw _T("ffmpeg video provider: 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("ffmpeg video provider: Failed to open video decoder");
// Parse file for keyframes and other useful stuff
LAVCKeyFrames LAVCFrameData(filename);
KeyFramesList = LAVCFrameData.GetKeyFrames();
keyFramesLoaded = true;
// set length etc.
length = LAVCFrameData.GetNumFrames();
framesData = LAVCFrameData.GetFrameData();
// Allocate frame
frame = avcodec_alloc_frame();
// Set frame
frameNumber = -1;
lastFrameNumber = -1;
allowUnsafeSeeking = Options.AsBool(_T("FFmpeg allow unsafe seeking"));
}
// 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((void*)frame);
frame = NULL;
// Free SWS context and other stuff from RGB conversion
if (sws_context)
sws_freeContext(sws_context);
sws_context = NULL;
if(frameRGB)
av_free(frameRGB);
frameRGB = NULL;
if(bufferRGB)
delete(bufferRGB);
bufferRGB = NULL;
// Close codec context
if (codec && codecContext) avcodec_close(codecContext);
codecContext = NULL;
codec = NULL;
// Close format context
if (lavcfile)
lavcfile->Release();
lavcfile = NULL;
}
//////////////////
// Get next frame
bool LAVCVideoProvider::GetNextFrame(int64_t *startDTS) {
AVPacket packet;
*startDTS = -1; // magic
// Read packet
while (av_read_frame(lavcfile->fctx, &packet)>=0) {
// Check if packet is part of video stream
if(packet.stream_index == vidStream) {
// Decode frame
int frameFinished;
if (*startDTS < 0)
*startDTS = packet.dts;
avcodec_decode_video(codecContext, frame, &frameFinished, packet.data, packet.size);
// Success?
if(frameFinished) {
// Set time
lastDecodeTime = packet.dts;
// Free packet and return
av_free_packet(&packet);
return true;
}
}
// free packet
av_free_packet(&packet);
}
// No more packets
return false;
}
/////////////
// Get frame
const AegiVideoFrame LAVCVideoProvider::GetFrame(int n,int formatType) {
// Return stored frame
// n = MID(0,n,GetFrameCount()-1);
if (n == lastFrameNumber) {
if (!validFrame) validFrame = true;
return curFrame;
}
if (frameNumber < 0)
frameNumber = 0;
// Find closest keyframe to the frame we want
int closestKeyFrame = FindClosestKeyframe(n);
bool hasSeeked = false;
// do we really need to seek?
// 10 frames is used as a margin to prevent excessive seeking since the predicted best keyframe isn't always selected by avformat
if (n < frameNumber || closestKeyFrame > frameNumber+10) {
// turns out we did need it, just do it
av_seek_frame(lavcfile->fctx, vidStream, framesData[closestKeyFrame].DTS, AVSEEK_FLAG_BACKWARD);
avcodec_flush_buffers(codecContext);
hasSeeked = true;
}
// regardless of whether we sekeed or not, decode frames until we have the one we want
do {
int64_t startTime;
GetNextFrame(&startTime);
if (hasSeeked) {
hasSeeked = false;
// is the seek destination known? does it belong to a frame?
if (startTime < 0 || (frameNumber = FrameFromDTS(startTime)) < 0) {
// guessing destination, may be unsafe
if (allowUnsafeSeeking)
frameNumber = ClosestFrameFromDTS(startTime);
else
throw _T("ffmpeg video provider: frame accurate seeking failed");
}
}
frameNumber++;
} while (frameNumber <= n);
// Get aegisub frame
AegiVideoFrame &final = curFrame;
if (frame) {
int w = codecContext->width;
int h = codecContext->height;
PixelFormat srcFormat = codecContext->pix_fmt;
PixelFormat dstFormat = PIX_FMT_BGRA;
// Allocate RGB32 buffer
if(!sws_context) //first frame
{
frameRGB = avcodec_alloc_frame();
unsigned int dstSize = avpicture_get_size(dstFormat,w,h);
bufferRGB = new uint8_t[dstSize];
sws_context = sws_getContext(w, h, srcFormat, w, h, dstFormat, SWS_PRINT_INFO | SWS_BICUBIC, NULL, NULL, NULL);
// sws_getContext() always returns NULL if context creation failed
if (sws_context == NULL)
throw _T("ffmpeg video provider: failed to initialize SwScaler colorspace conversion");
}
avpicture_fill((AVPicture*) frameRGB, bufferRGB, dstFormat, w, h);
// Set AegiVideoFrame
final.w = codecContext->width;
final.h = codecContext->height;
final.flipped = false;
final.invertChannels = true;
final.format = FORMAT_RGB32;
// Allocate
for (int i=0;i<4;i++) final.pitch[i] = frameRGB->linesize[i];
final.Allocate();
// Convert to RGB32, and write directly to the output frame
sws_scale(sws_context, frame->data, frame->linesize, 0, h, final.data, frameRGB->linesize);
}
else // No frame available
{
final = AegiVideoFrame(GetWidth(),GetHeight());
}
// Set current frame
validFrame = true;
lastFrameNumber = n;
// Return
return final;
}
////////////////
// Get position
int LAVCVideoProvider::GetPosition() {
return frameNumber;
}
////////////////////////
// Get number of frames
int LAVCVideoProvider::GetFrameCount() {
return length;
}
//////////////////
// Get frame rate
double LAVCVideoProvider::GetFPS() {
return double(stream->r_frame_rate.num) / double(stream->r_frame_rate.den);
}
//////////////////////
// Get original width
int LAVCVideoProvider::GetWidth() {
return codecContext->width;
}
///////////////////////
// Get original height
int LAVCVideoProvider::GetHeight() {
return codecContext->height;
}
//////////////////////
// Find the keyframe we should seek to if we want to seek to a given frame N
int LAVCVideoProvider::FindClosestKeyframe(int frameN) {
for (int i = frameN; i > 0; i--)
if (framesData[i].isKeyFrame)
return i;
return 0;
}
//////////////////////
// Convert a DTS into a frame number
int LAVCVideoProvider::FrameFromDTS(int64_t ADTS) {
for (int i = 0; i < (int)framesData.size(); i++)
if (framesData[i].DTS == ADTS)
return i;
return -1;
}
//////////////////////
// Find closest frame to the given DTS
int LAVCVideoProvider::ClosestFrameFromDTS(int64_t ADTS) {
int n = 0;
int64_t bestDiff = 0xFFFFFFFFFFFFFFLL; // big number
for (int i = 0; i < (int)framesData.size(); i++) {
int64_t currentDiff = FFABS(framesData[i].DTS - ADTS);
if (currentDiff < bestDiff) {
bestDiff = currentDiff;
n = i;
}
}
return n;
}
#endif // WITH_FFMPEG