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/*
* DFF -- An Open Source Digital Forensics Framework
* Copyright (C) 2009-2013 ArxSys
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*
* See http://www.digital-forensic.org for more information about this
* project. Please do not directly contact any of the maintainers of
* DFF for assistance; the project provides a web site, mailing lists
* and IRC channels for your use.
*
* Author(s):
* Solal Jacob <sja@digital-forensic.org>
*/
/*
* Most of code come from libffmpegthumbnailer by
* Dirk Vanden Boer <dirk.vdb@gmail.com>
*/
#include "node.hpp"
#include "vfile.hpp"
#include "video.hpp"
#include <libavcodec/avcodec.h>
Image::Image(uint8_t* idata, uint32_t size, int32_t width, int32_t height)
{
this->_data.size = size;
this->_data.buff = (char*)malloc(size);
memcpy(this->_data.buff, idata, size);
this->_width = width;
this->_height = height;
}
Image::~Image(void)
{
free(this->_data.buff);
}
ImageData Image::data(void)
{
return (this->_data);
}
int32_t Image::width(void)
{
return (this->_width);
}
int32_t Image::height(void)
{
return (this->_height);
}
extern "C"
{
int FFMpegRead(void* opaque, uint8_t* buf, int size)
{
VFile* file = (VFile*)opaque;
if (file == NULL)
return (-1);
return (file->read(buf, size));
}
int64_t FFMpegSeek(void* opaque, int64_t offset, int whence)
{
VFile* file = (VFile*)opaque;
if (file == NULL)
return (-1);
if (whence == AVSEEK_SIZE)
return ((int64_t)file->node()->size());
return ((int64_t)file->seek((uint64_t)offset, whence));
}
}
VideoDecoder::VideoDecoder(Node* node)
{
this->_file = NULL;
this->_buffer = NULL;
this->_IOContext = NULL;
this->_formatContext = NULL;
this->_codecContext = NULL;
this->_codec = NULL;
this->_stream = NULL;
this->_frame = NULL;
this->_packet = NULL;
this->_videoStream = -1;
this->_frameBuffer = NULL;
try
{
if ((node != NULL) && (node->size() > 0))
{
this->_file = node->open();
this->_buffer = (unsigned char *)av_malloc(4096*640);
if (this->_buffer == NULL)
{
this->_clear();
throw std::string("Can't allocate buffer");
}
}
this->_IOContext = avio_alloc_context(this->_buffer, 4096*640, 0, this->_file, FFMpegRead, NULL, FFMpegSeek);
}
catch (...)
{
this->_clear();
av_free(this->_buffer);
throw std::string("Error can't init class");
}
av_register_all();
avcodec_register_all();
av_log_set_level(-8);
this->_formatContext = avformat_alloc_context();
this->_formatContext->pb = this->_IOContext;
if (avformat_open_input(&(this->_formatContext), node->name().c_str(), NULL, NULL) != 0)
{
this->_clear();
throw std::string("can't open input stream");
}
if (avformat_find_stream_info(this->_formatContext, NULL) < 0)
{
this->_clear();
throw std::string("can't find video info");
}
this->_initializeVideo();
this->_frame = avcodec_alloc_frame();
}
VideoDecoder::~VideoDecoder()
{
this->_clear();
}
void VideoDecoder::_clear(void)
{
//error in ffmpeg av_close_input_file fail to free IOContext buff causing memory leak
//maybe didn't find the AVFMT_FLAG_CUSTOM_IO
if (this->_IOContext->buffer)
{
av_free(this->_IOContext->buffer);
this->_IOContext->buffer = NULL;
}
if (this->_IOContext)
{
av_free(this->_IOContext);
this->_IOContext = NULL;
}
if (this->_codecContext)
{
avcodec_close(this->_codecContext);
this->_codecContext = NULL;
}
if (this->_formatContext)
{
avformat_close_input(&this->_formatContext);
this->_formatContext = NULL;
}
if (this->_codec) //return by avcodec_find_decoder not allocated ?
this->_codec = NULL;
if (this->_stream)
this->_stream = NULL;
if (this->_frame)
av_free(this->_frame);
if (this->_frameBuffer)
av_free(this->_frameBuffer);
if (this->_packet)
{
av_free_packet(this->_packet);
delete this->_packet;
this->_packet = NULL;
}
if (this->_file)
this->_file->close();
delete this->_file;
}
void VideoDecoder::_convertAndScaleFrame(PixelFormat format, int scaledSize, bool maintainAspectRatio, int& scaledWidth, int& scaledHeight)
{
this->_calculateDimensions(scaledSize, maintainAspectRatio, scaledWidth, scaledHeight);
#ifdef LATEST_GREATEST_FFMPEG
// Enable this when it hits the released ffmpeg version
SwsContext* scaleContext = sws_alloc_context();
if (scaleContext == NULL)
throw std::logic_error("Failed to allocate scale context");
av_set_int(scaleContext, "srcw", this->_codecContext->width);
av_set_int(scaleContext, "srch", this->_codecContext->height);
av_set_int(scaleContext, "src_format", this->_codecContext->pix_fmt);
av_set_int(scaleContext, "dstw", scaledWidth);
av_set_int(scaleContext, "dsth", scaledHeight);
av_set_int(scaleContext, "dst_format", format);
av_set_int(scaleContext, "sws_flags", SWS_BICUBIC);
const int* coeff = sws_getCoefficients(SWS_CS_DEFAULT);
if (sws_setColorspaceDetails(scaleContext, coeff, this->_codecContext->pix_fmt, coeff, format, 0, 1<<16, 1<<16) < 0)
{
sws_freeContext(scaleContext);
throw std::logic_error("Failed to set colorspace details");
}
if (sws_init_context(scaleContext, NULL, NULL) < 0)
{
sws_freeContext(scaleContext);
throw std::logic_error("Failed to initialise scale context");
}
#endif
SwsContext* scaleContext = sws_getContext(this->_codecContext->width, this->_codecContext->height,
this->_codecContext->pix_fmt, scaledWidth, scaledHeight,
format, SWS_BICUBIC, NULL, NULL, NULL);
if (scaleContext == NULL)
{
throw std::string("Failed to create resize context");
}
AVFrame* convertedFrame = NULL;
uint8_t* convertedFrameBuffer = NULL;
this->_createAVFrame(&convertedFrame, &convertedFrameBuffer, scaledWidth, scaledHeight, format);
sws_scale(scaleContext, this->_frame->data, this->_frame->linesize, 0, this->_codecContext->height,
convertedFrame->data, convertedFrame->linesize);
sws_freeContext(scaleContext);
av_free(this->_frame);
av_free(this->_frameBuffer);
this->_frame = convertedFrame;
this->_frameBuffer = convertedFrameBuffer;
}
void VideoDecoder::_calculateDimensions(int squareSize, bool maintainAspectRatio, int& destWidth, int& destHeight)
{
if (squareSize == 0)
{
#undef max // Fixes Windows compilation error C2589, some other header
// file is polluting the global name space with a max
// macro.
squareSize = std::max(this->_codecContext->width, this->_codecContext->height);
}
if (!maintainAspectRatio)
{
destWidth = squareSize;
destHeight = squareSize;
}
else
{
int srcWidth = this->_codecContext->width;
int srcHeight = this->_codecContext->height;
int ascpectNominator = this->_codecContext->sample_aspect_ratio.num;
int ascpectDenominator = this->_codecContext->sample_aspect_ratio.den;
if (ascpectNominator != 0 && ascpectDenominator != 0)
{
srcWidth = srcWidth * ascpectNominator / ascpectDenominator;
}
if (srcWidth > srcHeight)
{
destWidth = squareSize;
destHeight = static_cast<int>(static_cast<float>(squareSize) / srcWidth * srcHeight);
}
else
{
destWidth = static_cast<int>(static_cast<float>(squareSize) / srcHeight * srcWidth);
destHeight = squareSize;
}
}
}
void VideoDecoder::_createAVFrame(AVFrame** pAvFrame, uint8_t** pFrameBuffer, int width, int height, PixelFormat format)
{
*pAvFrame = avcodec_alloc_frame();
int numBytes = avpicture_get_size(format, width, height);
*pFrameBuffer = reinterpret_cast<uint8_t*>(av_malloc(numBytes));
avpicture_fill((AVPicture*) *pAvFrame, *pFrameBuffer, format, width, height);
}
void VideoDecoder::_seek(int64_t seconds)
{
//if allowSEek return ?
int64_t timestamp = AV_TIME_BASE * seconds;
if (timestamp < 0)
timestamp = 0;
if (av_seek_frame(this->_formatContext, -1, timestamp, 0) >= 0)
avcodec_flush_buffers(this->_formatContext->streams[this->_videoStream]->codec);
else
throw std::string("Seek failed");
int keyFrameAttempts = 0;
bool gotFrame = 0;
do
{
int count = 0;
gotFrame = 0;
while (!gotFrame && count < 20)
{
this->_getVideoPacket();
try
{
gotFrame = this->_decodeVideoPacket();
}
catch (...) {}
++count;
}
++keyFrameAttempts;
} while ((!gotFrame || !this->_frame->key_frame) && keyFrameAttempts < 200);
if (gotFrame == 0)
throw std::string("Can't seek in video");
}
void VideoDecoder::_decodeVideoFrame()
{
bool frameFinished = false;
while (!frameFinished && this->_getVideoPacket())
frameFinished = this->_decodeVideoPacket();
if (!frameFinished)
throw std::string("decodeVideoFrame : frame not finished");
}
bool VideoDecoder::_decodeVideoPacket()
{
if (this->_packet->stream_index != this->_videoStream)
return false;
avcodec_get_frame_defaults(this->_frame);
int frameFinished;
int bytesDecoded = avcodec_decode_video2(this->_codecContext, this->_frame, &frameFinished, this->_packet);
if (bytesDecoded < 0)
throw std::string("fail to decode video frame");
return (frameFinished > 0);
}
bool VideoDecoder::_getVideoPacket(void)
{
bool framesAvailable = true;
bool frameDecoded = false;
int attempts = 0;
if (this->_packet)
{
av_free_packet(this->_packet);
delete this->_packet;
}
this->_packet = new AVPacket();
while (framesAvailable && !frameDecoded && (attempts++ < 1000))
{
if (av_read_frame(this->_formatContext, this->_packet) >= 0)
framesAvailable = true;
else
framesAvailable = false;
if (framesAvailable)
{
frameDecoded = this->_packet->stream_index == this->_videoStream;
if (!frameDecoded)
{
av_free_packet(this->_packet);
}
}
}
return (frameDecoded);
}
void VideoDecoder::_initializeVideo()
{
unsigned int i = 0;
for (; i < this->_formatContext->nb_streams; i++)
{
#if LIBAVCODEC_VERSION_MAJOR < 53
if (this->_formatContext->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO)
#else
if (this->_formatContext->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
#endif
{
this->_stream = this->_formatContext->streams[i];
this->_videoStream = i;
break;
}
}
if (this->_videoStream < 0)
{
this->_clear();
throw std::string("Could not find video stream");
}
this->_codecContext = this->_formatContext->streams[this->_videoStream]->codec;
this->_codec = avcodec_find_decoder(this->_codecContext->codec_id);
if (this->_codec == NULL)
{
this->_codecContext = NULL;
this->_clear();
throw std::string("Codec not found, can't decode");
}
this->_codecContext->workaround_bugs = 1;
if (avcodec_open2(this->_codecContext, this->_codec, NULL) < 0)
{
this->_clear();
throw std::string("Could not open video");
}
}
Image_p VideoDecoder::_thumbnail(int32_t scaledSize)
{
int scaledHeight, scaledWidth;
bool maintainAspectRatio = 0;
if (this->_frame->interlaced_frame)
avpicture_deinterlace((AVPicture*) this->_frame, (AVPicture*) this->_frame, this->_codecContext->pix_fmt,
this->_codecContext->width, this->_codecContext->height);
this->_convertAndScaleFrame(PIX_FMT_RGB32, scaledSize, maintainAspectRatio, scaledWidth, scaledHeight);
Image_p image(new Image(this->_frame->data[0], this->_frame->linesize[0] * scaledHeight, scaledWidth, scaledHeight));
return (image);
}
Image_p VideoDecoder::thumbnailAt(int64_t seconds, int32_t scaledSize)
{
//try {
this->_decodeVideoFrame();
this->_seek(seconds);
//}
//catch (std::string e)
//{
//cout << "error " << endl;
////this->_clear();
//this->_seek(0);
//this->_initializeVideo();
//this->_decodeVideoFrame();
//}
return (this->_thumbnail(scaledSize));
}
Image_p VideoDecoder::thumbnailAtPercent(uint8_t percent, int32_t scaledSize)
{
//check if 0 > x < 100 %
int64_t seconds = ((int64_t) ((float)this->duration() * (percent/100.00)));
return (this->thumbnailAt(seconds, scaledSize));
}
int32_t VideoDecoder::width()
{
if (this->_codecContext)
return (this->_codecContext->width);
return (-1);
}
int32_t VideoDecoder::height()
{
if (this->_codecContext)
return (this->_codecContext->height);
return (-1);
}
int32_t VideoDecoder::duration()
{
if (this->_formatContext)
return (this->_formatContext->duration / AV_TIME_BASE);
return (0);
}
std::string VideoDecoder::codec()
{
if (this->_codec)
{
return std::string(this->_codec->name);
}
return std::string("");
}
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