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RetroShare/plugins/VOIP/gui/VideoProcessor.cpp
Cyril Soler 63e38af19c Merge pull request #94 from AsamK/correct_libav_version 
Fix libav version check
2015-09-07 20:36:03 -04:00

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#include <iostream>
#include <assert.h>
#include <malloc.h>
#include <QByteArray>
#include <QBuffer>
#include <QImage>
#include "VideoProcessor.h"
#include "QVideoDevice.h"
#include <math.h>
#include <time.h>
#if defined(__MINGW32__)
#define memalign _aligned_malloc
#endif //MINGW
extern "C" {
#include <libavcodec/avcodec.h>
#include <libavutil/opt.h>
//#include <libavutil/channel_layout.h>
#include <libavutil/mem.h>
#include <libavutil/imgutils.h>
//#include <libavutil/mathematics.h>
//#include <libavutil/samplefmt.h>
}
//#define DEBUG_MPEG_VIDEO 1
VideoProcessor::VideoProcessor()
:_encoded_frame_size(640,480) , vpMtx("VideoProcessor")
{
_decoded_output_device = NULL ;
//_encoding_current_codec = VIDEO_PROCESSOR_CODEC_ID_JPEG_VIDEO;
_encoding_current_codec = VIDEO_PROCESSOR_CODEC_ID_MPEG_VIDEO;
_estimated_bandwidth_in = 0 ;
_estimated_bandwidth_out = 0 ;
_target_bandwidth_out = 30*1024 ; // 30 KB/s
_total_encoded_size_in = 0 ;
_total_encoded_size_out = 0 ;
_last_bw_estimate_in_TS = time(NULL) ;
_last_bw_estimate_out_TS = time(NULL) ;
}
VideoProcessor::~VideoProcessor()
{
// clear encoding queue
RS_STACK_MUTEX(vpMtx) ;
while(!_encoded_out_queue.empty())
{
_encoded_out_queue.back().clear() ;
_encoded_out_queue.pop_back() ;
}
}
bool VideoProcessor::processImage(const QImage& img)
{
VideoCodec *codec ;
switch(_encoding_current_codec)
{
case VIDEO_PROCESSOR_CODEC_ID_JPEG_VIDEO: codec = &_jpeg_video_codec ;
break ;
case VIDEO_PROCESSOR_CODEC_ID_MPEG_VIDEO: codec = &_mpeg_video_codec ;
break ;
default:
codec = NULL ;
}
// std::cerr << "reducing to " << _frame_size.width() << " x " << _frame_size.height() << std::endl;
if(codec)
{
RsVOIPDataChunk chunk ;
if(codec->encodeData(img.scaled(_encoded_frame_size,Qt::IgnoreAspectRatio,Qt::SmoothTransformation),_target_bandwidth_out,chunk) && chunk.size > 0)
{
RS_STACK_MUTEX(vpMtx) ;
_encoded_out_queue.push_back(chunk) ;
_total_encoded_size_out += chunk.size ;
}
time_t now = time(NULL) ;
if(now > _last_bw_estimate_out_TS)
{
RS_STACK_MUTEX(vpMtx) ;
_estimated_bandwidth_out = uint32_t(0.75*_estimated_bandwidth_out + 0.25 * (_total_encoded_size_out / (float)(now - _last_bw_estimate_out_TS))) ;
_total_encoded_size_out = 0 ;
_last_bw_estimate_out_TS = now ;
#ifdef DEBUG_VIDEO_OUTPUT_DEVICE
std::cerr << "new bw estimate: " << _estimated_bw << std::endl;
#endif
}
return true ;
}
else
{
std::cerr << "No codec for codec ID = " << _encoding_current_codec << ". Please call VideoProcessor::setCurrentCodec()" << std::endl;
return false ;
}
}
bool VideoProcessor::nextEncodedPacket(RsVOIPDataChunk& chunk)
{
RS_STACK_MUTEX(vpMtx) ;
if(_encoded_out_queue.empty())
return false ;
chunk = _encoded_out_queue.front() ;
_encoded_out_queue.pop_front() ;
return true ;
}
void VideoProcessor::setInternalFrameSize(QSize s)
{
_encoded_frame_size = s ;
}
void VideoProcessor::receiveEncodedData(const RsVOIPDataChunk& chunk)
{
static const int HEADER_SIZE = 4 ;
// read frame type. Use first 4 bytes to give info about content.
//
// Byte Meaning Values
// 00 Codec CODEC_ID_JPEG_VIDEO Basic Jpeg codec
// CODEC_ID_DDWT_VIDEO Differential wavelet compression
//
// 01 Unused Might be useful later
//
// 0203 Flags Codec specific flags.
//
if(chunk.size < HEADER_SIZE)
{
std::cerr << "JPEGVideoDecoder::decodeData(): Too small a data packet. size=" << chunk.size << std::endl;
return ;
}
uint32_t codid = ((unsigned char *)chunk.data)[0] + (((unsigned char *)chunk.data)[1] << 8) ;
//uint16_t flags = ((unsigned char *)chunk.data)[2] + (((unsigned char *)chunk.data)[3] << 8) ;
VideoCodec *codec ;
switch(codid)
{
case VIDEO_PROCESSOR_CODEC_ID_JPEG_VIDEO: codec = &_jpeg_video_codec ;
break ;
case VIDEO_PROCESSOR_CODEC_ID_MPEG_VIDEO: codec = &_mpeg_video_codec ;
break ;
default:
codec = NULL ;
}
QImage img ;
if(codec == NULL)
{
std::cerr << "Unknown decoding codec: " << codid << std::endl;
return ;
}
{
RS_STACK_MUTEX(vpMtx) ;
_total_encoded_size_in += chunk.size ;
time_t now = time(NULL) ;
if(now > _last_bw_estimate_in_TS)
{
_estimated_bandwidth_in = uint32_t(0.75*_estimated_bandwidth_in + 0.25 * (_total_encoded_size_in / (float)(now - _last_bw_estimate_in_TS))) ;
_total_encoded_size_in = 0 ;
_last_bw_estimate_in_TS = now ;
#ifdef DEBUG_VIDEO_OUTPUT_DEVICE
std::cerr << "new bw estimate (in): " << _estimated_bandwidth_in << std::endl;
#endif
}
}
if(!codec->decodeData(chunk,img))
{
std::cerr << "No image decoded. Probably in the middle of something..." << std::endl;
return ;
}
if(_decoded_output_device)
_decoded_output_device->showFrame(img) ;
}
void VideoProcessor::setMaximumBandwidth(uint32_t bytes_per_sec)
{
std::cerr << "Video Encoder: maximum frame rate is set to " << bytes_per_sec << " Bps" << std::endl;
_target_bandwidth_out = bytes_per_sec ;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
//////////////////////////////////////////////////////////////////////////////////////////////////////////////
JPEGVideo::JPEGVideo()
: _encoded_ref_frame_max_distance(10),_encoded_ref_frame_count(10)
{
}
bool JPEGVideo::decodeData(const RsVOIPDataChunk& chunk,QImage& image)
{
// now see if the frame is a differential frame, or just a reference frame.
uint16_t codec = ((unsigned char *)chunk.data)[0] + (((unsigned char *)chunk.data)[1] << 8) ;
uint16_t flags = ((unsigned char *)chunk.data)[2] + (((unsigned char *)chunk.data)[3] << 8) ;
assert(codec == VideoProcessor::VIDEO_PROCESSOR_CODEC_ID_JPEG_VIDEO) ;
// un-compress image data
QByteArray qb((char*)&((uint8_t*)chunk.data)[HEADER_SIZE],(int)chunk.size - HEADER_SIZE) ;
if(!image.loadFromData(qb,"JPEG"))
{
std::cerr << "image.loadFromData(): returned an error.: " << std::endl;
return false ;
}
if(flags & JPEG_VIDEO_FLAGS_DIFFERENTIAL_FRAME)
{
if(_decoded_reference_frame.size() != image.size())
{
std::cerr << "Bad reference frame!" << std::endl;
return false ;
}
QImage res = _decoded_reference_frame ;
for(int i=0;i<image.byteCount();++i)
{
int new_val = (int)res.bits()[i] + ((int)image.bits()[i] - 128) ;
res.bits()[i] = std::max(0,std::min(255,new_val)) ;
}
image = res ;
}
else
_decoded_reference_frame = image ;
return true ;
}
bool JPEGVideo::encodeData(const QImage& image,uint32_t /* size_hint */,RsVOIPDataChunk& voip_chunk)
{
// check if we make a diff image, or if we use the full frame.
QImage encoded_frame ;
bool differential_frame ;
if(_encoded_ref_frame_count++ < _encoded_ref_frame_max_distance && image.size() == _encoded_reference_frame.size())
{
// compute difference with reference frame.
encoded_frame = image ;
for(int i=0;i<image.byteCount();++i)
{
// We cannot use basic modulo 256 arithmetic, because the decompressed JPeg frames do not follow the same rules (values are clamped)
// and cause color blotches when perturbated by a differential frame.
int diff = ( (int)image.bits()[i] - (int)_encoded_reference_frame.bits()[i]) + 128;
encoded_frame.bits()[i] = (unsigned char)std::max(0,std::min(255,diff)) ;
}
differential_frame = true ;
}
else
{
_encoded_ref_frame_count = 0 ;
_encoded_reference_frame = image ;
encoded_frame = image ;
differential_frame = false ;
}
QByteArray qb ;
QBuffer buffer(&qb) ;
buffer.open(QIODevice::WriteOnly) ;
encoded_frame.save(&buffer,"JPEG") ;
voip_chunk.data = malloc(HEADER_SIZE + qb.size());
// build header
uint32_t flags = differential_frame ? JPEG_VIDEO_FLAGS_DIFFERENTIAL_FRAME : 0x0 ;
((unsigned char *)voip_chunk.data)[0] = VideoProcessor::VIDEO_PROCESSOR_CODEC_ID_JPEG_VIDEO & 0xff ;
((unsigned char *)voip_chunk.data)[1] = (VideoProcessor::VIDEO_PROCESSOR_CODEC_ID_JPEG_VIDEO >> 8) & 0xff ;
((unsigned char *)voip_chunk.data)[2] = flags & 0xff ;
((unsigned char *)voip_chunk.data)[3] = (flags >> 8) & 0xff ;
memcpy(&((unsigned char*)voip_chunk.data)[HEADER_SIZE],qb.data(),qb.size()) ;
voip_chunk.size = HEADER_SIZE + qb.size() ;
voip_chunk.type = RsVOIPDataChunk::RS_VOIP_DATA_TYPE_VIDEO ;
return true ;
}
FFmpegVideo::FFmpegVideo()
{
// Encoding
encoding_codec = NULL ;
encoding_frame_buffer = NULL ;
encoding_context = NULL ;
//AVCodecID codec_id = AV_CODEC_ID_H264 ;
//AVCodecID codec_id = AV_CODEC_ID_MPEG2VIDEO;
#if LIBAVCODEC_VERSION_MAJOR < 54
CodecID codec_id = CODEC_ID_MPEG4;
#else
AVCodecID codec_id = AV_CODEC_ID_MPEG4;
#endif
/* find the mpeg1 video encoder */
encoding_codec = avcodec_find_encoder(codec_id);
if (!encoding_codec) throw("AV codec not found for codec id ") ;
encoding_context = avcodec_alloc_context3(encoding_codec);
if (!encoding_context) throw std::runtime_error("AV: Could not allocate video codec encoding context");
/* put sample parameters */
encoding_context->bit_rate = 10*1024 ; // default bitrate is 30KB/s
encoding_context->bit_rate_tolerance = encoding_context->bit_rate ;
#ifdef USE_VARIABLE_BITRATE
encoding_context->rc_min_rate = 0;
encoding_context->rc_max_rate = 10*1024;//encoding_context->bit_rate;
encoding_context->rc_buffer_size = 10*1024*1024;
encoding_context->rc_initial_buffer_occupancy = (int) ( 0.9 * encoding_context->rc_buffer_size);
encoding_context->rc_max_available_vbv_use = 1.0;
encoding_context->rc_min_vbv_overflow_use = 0.0;
#else
encoding_context->rc_min_rate = 0;
encoding_context->rc_max_rate = 0;
encoding_context->rc_buffer_size = 0;
#endif
encoding_context->flags |= CODEC_FLAG_PSNR;
encoding_context->flags |= CODEC_FLAG_TRUNCATED;
encoding_context->flags |= CODEC_CAP_PARAM_CHANGE;
encoding_context->i_quant_factor = 0.769f;
encoding_context->b_quant_factor = 1.4f;
encoding_context->time_base.num = 1;
encoding_context->time_base.den = 15;//framesPerSecond;
encoding_context->qmin = 1;
encoding_context->qmax = 51;
encoding_context->max_qdiff = 4;
//encoding_context->me_method = ME_HEX;
//encoding_context->max_b_frames = 4;
//encoding_context->flags |= CODEC_FLAG_LOW_DELAY; // MPEG2 only
//encoding_context->partitions = X264_PART_I4X4 | X264_PART_I8X8 | X264_PART_P8X8 | X264_PART_P4X4 | X264_PART_B8X8;
//encoding_context->crf = 0.0f;
//encoding_context->cqp = 26;
/* resolution must be a multiple of two */
encoding_context->width = 640;//176;
encoding_context->height = 480;//144;
/* frames per second */
encoding_context->time_base = (AVRational){1,25};
/* emit one intra frame every ten frames
* check frame pict_type before passing frame
* to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
* then gop_size is ignored and the output of encoder
* will always be I frame irrespective to gop_size
*/
encoding_context->gop_size = 100;
//encoding_context->max_b_frames = 1;
#if LIBAVCODEC_VERSION_MAJOR < 54
encoding_context->pix_fmt = PIX_FMT_YUV420P; //context->pix_fmt = PIX_FMT_RGB24;
if (codec_id == CODEC_ID_H264) {
#else
encoding_context->pix_fmt = AV_PIX_FMT_YUV420P; //context->pix_fmt = AV_PIX_FMT_RGB24;
if (codec_id == AV_CODEC_ID_H264) {
#endif
av_opt_set(encoding_context->priv_data, "preset", "slow", 0);
}
/* open it */
if (avcodec_open2(encoding_context, encoding_codec, NULL) < 0)
throw std::runtime_error( "AV: Could not open codec context. Something's wrong.");
encoding_frame_buffer = avcodec_alloc_frame() ;//(AVFrame*)malloc(sizeof(AVFrame)) ;
if(!encoding_frame_buffer)
throw std::runtime_error("AV: could not allocate frame buffer.") ;
encoding_frame_buffer->format = encoding_context->pix_fmt;
encoding_frame_buffer->width = encoding_context->width;
encoding_frame_buffer->height = encoding_context->height;
/* the image can be allocated by any means and av_image_alloc() is
* just the most convenient way if av_malloc() is to be used */
int ret = av_image_alloc(encoding_frame_buffer->data, encoding_frame_buffer->linesize,
encoding_context->width, encoding_context->height, encoding_context->pix_fmt, 32);
if (ret < 0)
throw std::runtime_error("AV: Could not allocate raw picture buffer");
encoding_frame_count = 0 ;
// Decoding
decoding_codec = avcodec_find_decoder(codec_id);
if (!decoding_codec)
throw("AV codec not found for codec id ") ;
decoding_context = avcodec_alloc_context3(decoding_codec);
if(!decoding_context)
throw std::runtime_error("AV: Could not allocate video codec decoding context");
decoding_context->width = encoding_context->width;
decoding_context->height = encoding_context->height;
#if LIBAVCODEC_VERSION_MAJOR < 54
decoding_context->pix_fmt = PIX_FMT_YUV420P;
#else
decoding_context->pix_fmt = AV_PIX_FMT_YUV420P;
#endif
if(decoding_codec->capabilities & CODEC_CAP_TRUNCATED)
decoding_context->flags |= CODEC_FLAG_TRUNCATED; // we do not send complete frames
if(avcodec_open2(decoding_context,decoding_codec,NULL) < 0)
throw("AV codec open action failed! ") ;
decoding_frame_buffer = avcodec_alloc_frame() ;//(AVFrame*)malloc(sizeof(AVFrame)) ;
av_init_packet(&decoding_buffer);
decoding_buffer.data = NULL ;
decoding_buffer.size = 0 ;
//ret = av_image_alloc(decoding_frame_buffer->data, decoding_frame_buffer->linesize, decoding_context->width, decoding_context->height, decoding_context->pix_fmt, 32);
//if (ret < 0)
//throw std::runtime_error("AV: Could not allocate raw picture buffer");
// debug
#ifdef DEBUG_MPEG_VIDEO
std::cerr << "Dumping captured data to file tmpvideo.mpg" << std::endl;
encoding_debug_file = fopen("tmpvideo.mpg","w") ;
#endif
}
FFmpegVideo::~FFmpegVideo()
{
avcodec_close(encoding_context);
avcodec_close(decoding_context);
av_free(encoding_context);
av_free(decoding_context);
av_freep(&encoding_frame_buffer->data[0]);
av_freep(&decoding_frame_buffer->data[0]);
free(encoding_frame_buffer);
free(decoding_frame_buffer);
}
#define MAX_FFMPEG_ENCODING_BITRATE 81920
bool FFmpegVideo::encodeData(const QImage& image, uint32_t target_encoding_bitrate, RsVOIPDataChunk& voip_chunk)
{
#ifdef DEBUG_MPEG_VIDEO
std::cerr << "Encoding frame of size " << image.width() << "x" << image.height() << ", resized to " << encoding_frame_buffer->width << "x" << encoding_frame_buffer->height << " : ";
#endif
QImage input ;
if(target_encoding_bitrate > MAX_FFMPEG_ENCODING_BITRATE)
{
std::cerr << "Max encodign bitrate eexceeded. Capping to " << MAX_FFMPEG_ENCODING_BITRATE << std::endl;
target_encoding_bitrate = MAX_FFMPEG_ENCODING_BITRATE ;
}
//encoding_context->bit_rate = target_encoding_bitrate;
encoding_context->rc_max_rate = target_encoding_bitrate;
//encoding_context->bit_rate_tolerance = target_encoding_bitrate;
if(image.width() != encoding_frame_buffer->width || image.height() != encoding_frame_buffer->height)
input = image.scaled(QSize(encoding_frame_buffer->width,encoding_frame_buffer->height),Qt::IgnoreAspectRatio,Qt::SmoothTransformation) ;
else
input = image ;
/* prepare a dummy image */
/* Y */
for (int y = 0; y < encoding_context->height/2; y++)
for (int x = 0; x < encoding_context->width/2; x++)
{
QRgb pix00 = input.pixel(QPoint(2*x+0,2*y+0)) ;
QRgb pix01 = input.pixel(QPoint(2*x+0,2*y+1)) ;
QRgb pix10 = input.pixel(QPoint(2*x+1,2*y+0)) ;
QRgb pix11 = input.pixel(QPoint(2*x+1,2*y+1)) ;
int R00 = (pix00 >> 16) & 0xff ; int G00 = (pix00 >> 8) & 0xff ; int B00 = (pix00 >> 0) & 0xff ;
int R01 = (pix01 >> 16) & 0xff ; int G01 = (pix01 >> 8) & 0xff ; int B01 = (pix01 >> 0) & 0xff ;
int R10 = (pix10 >> 16) & 0xff ; int G10 = (pix10 >> 8) & 0xff ; int B10 = (pix10 >> 0) & 0xff ;
int R11 = (pix11 >> 16) & 0xff ; int G11 = (pix11 >> 8) & 0xff ; int B11 = (pix11 >> 0) & 0xff ;
int Y00 = (0.257 * R00) + (0.504 * G00) + (0.098 * B00) + 16 ;
int Y01 = (0.257 * R01) + (0.504 * G01) + (0.098 * B01) + 16 ;
int Y10 = (0.257 * R10) + (0.504 * G10) + (0.098 * B10) + 16 ;
int Y11 = (0.257 * R11) + (0.504 * G11) + (0.098 * B11) + 16 ;
float R = 0.25*(R00+R01+R10+R11) ;
float G = 0.25*(G00+G01+G10+G11) ;
float B = 0.25*(B00+B01+B10+B11) ;
int U = (0.439 * R) - (0.368 * G) - (0.071 * B) + 128 ;
int V = -(0.148 * R) - (0.291 * G) + (0.439 * B) + 128 ;
encoding_frame_buffer->data[0][(2*y+0) * encoding_frame_buffer->linesize[0] + 2*x+0] = std::min(255,std::max(0,Y00)); // Y
encoding_frame_buffer->data[0][(2*y+0) * encoding_frame_buffer->linesize[0] + 2*x+1] = std::min(255,std::max(0,Y01)); // Y
encoding_frame_buffer->data[0][(2*y+1) * encoding_frame_buffer->linesize[0] + 2*x+0] = std::min(255,std::max(0,Y10)); // Y
encoding_frame_buffer->data[0][(2*y+1) * encoding_frame_buffer->linesize[0] + 2*x+1] = std::min(255,std::max(0,Y11)); // Y
encoding_frame_buffer->data[1][y * encoding_frame_buffer->linesize[1] + x] = std::min(255,std::max(0,U));// Cr
encoding_frame_buffer->data[2][y * encoding_frame_buffer->linesize[2] + x] = std::min(255,std::max(0,V));// Cb
}
encoding_frame_buffer->pts = encoding_frame_count++;
/* encode the image */
int got_output = 0;
AVFrame *frame = encoding_frame_buffer ;
AVPacket pkt ;
av_init_packet(&pkt);
#if LIBAVCODEC_VERSION_MAJOR < 54
pkt.size = avpicture_get_size(encoding_context->pix_fmt, encoding_context->width, encoding_context->height);
pkt.data = (uint8_t*)av_malloc(pkt.size);
// do
// {
int ret = avcodec_encode_video(encoding_context, pkt.data, pkt.size, frame) ;
if (ret > 0) {
got_output = ret;
}
#else
pkt.data = NULL; // packet data will be allocated by the encoder
pkt.size = 0;
// do
// {
int ret = avcodec_encode_video2(encoding_context, &pkt, frame, &got_output) ;
#endif
if (ret < 0)
{
std::cerr << "Error encoding frame!" << std::endl;
return false ;
}
// frame = NULL ; // next attempts: do not encode anything. Do this to just flush the buffer
//
// } while(got_output) ;
if(got_output)
{
voip_chunk.data = malloc(pkt.size + HEADER_SIZE) ;
uint32_t flags = 0;
((unsigned char *)voip_chunk.data)[0] = VideoProcessor::VIDEO_PROCESSOR_CODEC_ID_MPEG_VIDEO & 0xff ;
((unsigned char *)voip_chunk.data)[1] = (VideoProcessor::VIDEO_PROCESSOR_CODEC_ID_MPEG_VIDEO >> 8) & 0xff ;
((unsigned char *)voip_chunk.data)[2] = flags & 0xff ;
((unsigned char *)voip_chunk.data)[3] = (flags >> 8) & 0xff ;
memcpy(&((unsigned char*)voip_chunk.data)[HEADER_SIZE],pkt.data,pkt.size) ;
voip_chunk.size = pkt.size + HEADER_SIZE;
voip_chunk.type = RsVOIPDataChunk::RS_VOIP_DATA_TYPE_VIDEO ;
#ifdef DEBUG_MPEG_VIDEO
std::cerr << "Output : " << pkt.size << " bytes." << std::endl;
fwrite(pkt.data,1,pkt.size,encoding_debug_file) ;
fflush(encoding_debug_file) ;
#endif
av_free_packet(&pkt);
return true ;
}
else
{
voip_chunk.data = NULL;
voip_chunk.size = 0;
voip_chunk.type = RsVOIPDataChunk::RS_VOIP_DATA_TYPE_VIDEO ;
std::cerr << "No output produced." << std::endl;
return false ;
}
}
bool FFmpegVideo::decodeData(const RsVOIPDataChunk& chunk,QImage& image)
{
#ifdef DEBUG_MPEG_VIDEO
std::cerr << "Decoding data of size " << chunk.size << std::endl;
#endif
unsigned char *buff ;
if(decoding_buffer.data != NULL)
{
#ifdef DEBUG_MPEG_VIDEO
std::cerr << "Completing buffer with size " << chunk.size - HEADER_SIZE + decoding_buffer.size << ": copying existing "
<< decoding_buffer.size << " bytes. Adding new " << chunk.size - HEADER_SIZE<< " bytes " << std::endl;
#endif
uint32_t s = chunk.size - HEADER_SIZE + decoding_buffer.size ;
unsigned char *tmp = (unsigned char*)memalign(16,s + FF_INPUT_BUFFER_PADDING_SIZE) ;
memset(tmp,0,s+FF_INPUT_BUFFER_PADDING_SIZE) ;
memcpy(tmp,decoding_buffer.data,decoding_buffer.size) ;
free(decoding_buffer.data) ;
buff = &tmp[decoding_buffer.size] ;
decoding_buffer.size = s ;
decoding_buffer.data = tmp ;
}
else
{
#ifdef DEBUG_MPEG_VIDEO
std::cerr << "Allocating new buffer of size " << chunk.size - HEADER_SIZE << std::endl;
#endif
decoding_buffer.data = (unsigned char *)memalign(16,chunk.size - HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE) ;
decoding_buffer.size = chunk.size - HEADER_SIZE ;
memset(decoding_buffer.data,0,decoding_buffer.size + FF_INPUT_BUFFER_PADDING_SIZE) ;
buff = decoding_buffer.data ;
}
memcpy(buff,&((unsigned char*)chunk.data)[HEADER_SIZE],chunk.size - HEADER_SIZE) ;
int got_frame = 0 ;
int len = avcodec_decode_video2(decoding_context,decoding_frame_buffer,&got_frame,&decoding_buffer) ;
if(len < 0)
{
std::cerr << "Error decodign frame!" << std::endl;
return false ;
}
#ifdef DEBUG_MPEG_VIDEO
std::cerr << "Used " << len << " bytes out of " << decoding_buffer.size << ". got_frame = " << got_frame << std::endl;
#endif
if(got_frame)
{
image = QImage(QSize(decoding_frame_buffer->width,decoding_frame_buffer->height),QImage::Format_ARGB32) ;
#ifdef DEBUG_MPEG_VIDEO
std::cerr << "Decoded frame. Size=" << image.width() << "x" << image.height() << std::endl;
#endif
for (int y = 0; y < decoding_frame_buffer->height; y++)
for (int x = 0; x < decoding_frame_buffer->width; x++)
{
int Y = decoding_frame_buffer->data[0][y * decoding_frame_buffer->linesize[0] + x] ;
int U = decoding_frame_buffer->data[1][(y/2) * decoding_frame_buffer->linesize[1] + x/2] ;
int V = decoding_frame_buffer->data[2][(y/2) * decoding_frame_buffer->linesize[2] + x/2] ;
int B = std::min(255,std::max(0,(int)(1.164*(Y - 16) + 1.596*(V - 128)))) ;
int G = std::min(255,std::max(0,(int)(1.164*(Y - 16) - 0.813*(V - 128) - 0.391*(U - 128)))) ;
int R = std::min(255,std::max(0,(int)(1.164*(Y - 16) + 2.018*(U - 128)))) ;
image.setPixel(QPoint(x,y),QRgb( 0xff000000 + (R << 16) + (G << 8) + B)) ;
}
}
if(len == decoding_buffer.size)
{
free(decoding_buffer.data) ;
decoding_buffer.data = NULL;
decoding_buffer.size = 0;
}
else if(len != 0)
{
#ifdef DEBUG_MPEG_VIDEO
std::cerr << "Moving remaining data (" << decoding_buffer.size - len << " bytes) back to 0" << std::endl;
#endif
memmove(decoding_buffer.data,decoding_buffer.data+len,decoding_buffer.size - len) ;
decoding_buffer.size -= len ;
}
return true ;
}
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