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k9copy/k9author/k9avidecode.cpp

330 lines
9.5 KiB

//
// C++ Implementation: k9avidecode
//
// Description:
//
//
// Author: Jean-Michel PETIT <k9copy@free.fr>, (C) 2007
//
// Copyright: See COPYING file that comes with this distribution
//
//
#include "config.h"
#include "k9avidecode.h"
// This is probably the incorrect revision for when CODEC_TYPE_VIDEO was removed
// Please update the comparison below if you know the exact revision that CODEC_TYPE_VIDEO was removed in!
#if LIBAVCODEC_VERSION_INT < (AV_VERSION_INT(52,72,2))
#define AVMEDIA_TYPE_VIDEO CODEC_TYPE_VIDEO
#endif
#if LIBAVUTIL_VERSION_INT < AV_VERSION_INT(51,42,0)
#define AV_PIX_FMT_RGB24 PIX_FMT_RGB24
#endif
#include <tqimage.h>
#include <dlfcn.h>
#include <tdelocale.h>
#include <cstdlib>
#include "ac.h"
static int sws_flags = SWS_BICUBIC;
k9AviDecode::k9AviDecode(TQObject *parent, const char *name)
: TQObject(parent, name) {
#if LIBAVFORMAT_VERSION_INT < AV_VERSION_INT(58,9,100)
av_register_all();
#endif
m_opened=false;
m_FormatCtx = NULL;
m_CodecCtx = NULL;
m_Codec = NULL;
m_Frame = NULL;
m_FrameRGB = NULL;
m_buffer = NULL;
}
k9AviDecode::~k9AviDecode() {
if (m_opened)
close();
}
#include "k9avidecode.moc"
bool k9AviDecode::open(const TQString & _fileName) {
m_error="";
if (m_opened)
close();
// Open video file
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53, 2, 0)
if (avformat_open_input(&m_FormatCtx, _fileName.utf8(), NULL, NULL)!=0)
#else
if (av_open_input_file(&m_FormatCtx, _fileName.utf8(), NULL, 0, NULL)!=0)
#endif
{
m_error=i18n("Couldn't open the file %1").arg(_fileName);
return false; // Couldn't open file}
}
// Retrieve stream information
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53, 6, 0)
if (avformat_find_stream_info(m_FormatCtx, NULL)<0)
#else
if (av_find_stream_info(m_FormatCtx)<0)
#endif
{
m_error =i18n("Couldn't find stream information");
return false; // Couldn't find stream information
}
unsigned int i;
// Find the first video stream
m_videoStream=-1;
for (i=0; i<m_FormatCtx->nb_streams; i++)
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 33, 100)
if (m_FormatCtx->streams[i]->codecpar->codec_type==AVMEDIA_TYPE_VIDEO)
#else
if (m_FormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
#endif
{
m_videoStream=i;
break;
}
if (m_videoStream==-1) {
m_error=i18n("The file doesn't contain any video stream");
return false; // Didn't find a video stream
}
// Find the decoder for the video stream
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 33, 100)
m_Codec=(AVCodec *)avcodec_find_decoder(m_FormatCtx->streams[m_videoStream]->codecpar->codec_id);
#else
m_Codec=(AVCodec *)avcodec_find_decoder(m_FormatCtx->streams[m_videoStream]->codec->codec_id);
#endif
if (m_Codec==NULL) {
m_error=i18n("Unsupported codec");
return false; // Codec not found
}
// Get/allocate a pointer to the codec context for the video stream
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 33, 100)
m_CodecCtx = avcodec_alloc_context3(m_Codec);
if (m_CodecCtx) {
avcodec_parameters_to_context(m_CodecCtx, m_FormatCtx->streams[m_videoStream]->codecpar);
}
else {
m_error=i18n("Failed to allocate a codec context");
return false;
}
#else
m_CodecCtx=m_FormatCtx->streams[m_videoStream]->codec;
#endif
// Open codec
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(53, 8, 0)
if (avcodec_open2(m_CodecCtx, m_Codec, NULL)<0)
#else
if (avcodec_open(m_CodecCtx, m_Codec)<0)
#endif
{
m_error =i18n("Could'nt open the codec");
return false; // Could not open codec
}
// Allocate video frame
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 45, 101)
m_Frame=av_frame_alloc();
#else
m_Frame=avcodec_alloc_frame();
#endif
// Allocate an AVFrame structure
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 45, 101)
m_FrameRGB=av_frame_alloc();
#else
m_FrameRGB=avcodec_alloc_frame();
#endif
if (m_FrameRGB==NULL) {
m_error =i18n ("Unable to allocate memory for frames");
return false;
}
int numBytes;
// Determine required buffer size and allocate buffer
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 24, 100)
numBytes=av_image_get_buffer_size(AV_PIX_FMT_RGB24, m_CodecCtx->width,
m_CodecCtx->height, 1);
#else
numBytes=avpicture_get_size(AV_PIX_FMT_RGB24, m_CodecCtx->width,
m_CodecCtx->height);
#endif
m_buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
// Assign appropriate parts of buffer to image planes in pFrameRGB
// Note that pFrameRGB is an AVFrame, but AVFrame is a superset
// of AVPicture
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 24, 100)
av_image_fill_arrays(m_FrameRGB->data, m_FrameRGB->linesize, m_buffer,
AV_PIX_FMT_RGB24, m_CodecCtx->width, m_CodecCtx->height, 1);
#else
avpicture_fill((AVPicture *)m_FrameRGB, m_buffer, AV_PIX_FMT_RGB24,
m_CodecCtx->width, m_CodecCtx->height);
#endif
m_duration=(double)m_FormatCtx->duration / AV_TIME_BASE;
m_opened=true;
m_fileName=_fileName;
return true;
}
void k9AviDecode::seek(double _seconds) {
AVRational time_base = m_FormatCtx->streams[m_videoStream]->time_base;
int64_t fspos = (int64_t)(_seconds * AV_TIME_BASE);
fspos=av_rescale_q(fspos, AV_TIME_BASE_Q, time_base);
int i=av_seek_frame(m_FormatCtx, m_videoStream, fspos, AVSEEK_FLAG_BACKWARD );
double pos=av_gettime() / 1000000;
}
void k9AviDecode::readFrame(double _seconds) {
AVRational time_base = m_FormatCtx->streams[m_videoStream]->time_base;
int64_t fspos = (int64_t)(_seconds * AV_TIME_BASE);
fspos=av_rescale_q(fspos, AV_TIME_BASE_Q, time_base);
int res=av_seek_frame(m_FormatCtx, m_videoStream, fspos, AVSEEK_FLAG_BACKWARD );
avcodec_flush_buffers(m_CodecCtx);
int frameFinished=0;
AVPacket *packet;
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 12, 100)
packet = av_packet_alloc();
#else
AVPacket _packet;
av_init_packet(&_packet);
packet = &_packet;
#endif
struct SwsContext *toRGB_convert_ctx;
bool bFound=false;
while (av_read_frame(m_FormatCtx, packet)>=0 && !bFound) {
// Is this a packet from the video stream?
if (packet->stream_index==m_videoStream) {
// Decode video frame
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 37, 100)
int ret = avcodec_receive_frame(m_CodecCtx, m_Frame);
if (ret == 0)
frameFinished = 1;
else if (ret == AVERROR(EAGAIN))
ret = 0;
if (ret == 0)
ret = avcodec_send_packet(m_CodecCtx, packet);
#elif LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52, 23, 0)
avcodec_decode_video2(m_CodecCtx, m_Frame, &frameFinished, packet);
#else
avcodec_decode_video(m_CodecCtx, m_Frame, &frameFinished,
packet->data, packet->size);
#endif
// Did we get a video frame?
if (frameFinished) {
int64_t cur_dts=fspos;
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(54, 2, 0)
cur_dts = packet->dts;
#else
if (m_FormatCtx->cur_st)
cur_dts = m_FormatCtx->cur_st->cur_dts;
#endif
if (cur_dts >=fspos) {
bFound=true;
toRGB_convert_ctx=sws_getContext(m_CodecCtx->width, m_CodecCtx->height, m_CodecCtx->pix_fmt, m_CodecCtx->width, m_CodecCtx->height, AV_PIX_FMT_RGB24, sws_flags,NULL,NULL,NULL);
sws_scale(toRGB_convert_ctx, m_Frame->data, m_Frame->linesize, 0, m_CodecCtx->height, m_FrameRGB->data,m_FrameRGB->linesize);
// convert frame to QImage
SaveFrame(m_FrameRGB, m_CodecCtx->width,
m_CodecCtx->height);
sws_freeContext(toRGB_convert_ctx);
}
}
}
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 25, 100)
// Unreference the packet from av_read_frame
av_packet_unref(packet);
#else
// Free the packet from av_read_frame
av_free_packet(packet);
#endif
}
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 12, 100)
av_packet_free(&packet);
#endif
}
void k9AviDecode::SaveFrame(AVFrame *pFrame, int width, int height) {
TQImage pix;
int len =(int) (3*width*height);
char c[255];
// Write header
sprintf(c,"P6\n%d %d\n255\n", width, height);
char *s= (char*) malloc(len+strlen(c));
tc_memcpy(s,c,strlen(c));
tc_memcpy(s+strlen(c),pFrame->data[0], len);
pix.loadFromData((uchar*)s,strlen(c)+len);
free(s);
emit drawFrame( &pix);
}
void k9AviDecode::close() {
if (m_opened) {
// Free the RGB image
av_free(m_buffer);
av_free(m_FrameRGB);
// Free the YUV frame
av_free(m_Frame);
// Close the codec
avcodec_close(m_CodecCtx);
// Close the video file
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53, 17, 0)
avformat_close_input(&m_FormatCtx);
#else
av_close_input_file(m_FormatCtx);
#endif
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 63, 100)
avcodec_free_context(&m_CodecCtx);
#endif
m_opened=false;
}
}
double k9AviDecode::getDuration() const {
return m_duration;
}
bool k9AviDecode::opened() const {
return m_opened;
}
TQString k9AviDecode::getFileName() const {
return m_fileName;
}
TQString k9AviDecode::getError() const {
return m_error;
}