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285 lines
8.5 KiB
285 lines
8.5 KiB
//
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// C++ Implementation: k9avidecode
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//
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// Description:
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//
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//
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// Author: Jean-Michel PETIT <k9copy@free.fr>, (C) 2007
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//
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// Copyright: See COPYING file that comes with this distribution
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//
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//
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#include "k9avidecode.h"
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#ifdef OLD_FFMPEG
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#include <ffmpeg/avcodec.h>
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#endif
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#ifdef NEW_FFMPEG
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#endif
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// This is probably the incorrect revision for when CODEC_TYPE_VIDEO was removed
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// Please update the comparison below if you know the exact revision that CODEC_TYPE_VIDEO was removed in!
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#if LIBAVCODEC_VERSION_INT < (AV_VERSION_INT(52,72,2))
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#define AVMEDIA_TYPE_VIDEO CODEC_TYPE_VIDEO
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#endif
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#include <tqimage.h>
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#include <dlfcn.h>
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#include <klocale.h>
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#include <cstdlib>
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#include "ac.h"
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void *CodecHandle=0;
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void *FormatHandle=0;
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int glibref=0;
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#ifdef NEW_FFMPEG
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#ifdef NEEDS_AV_FREE_PACKET
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void av_free_packet(AVPacket *pkt)
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{
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if (pkt) {
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if (pkt->destruct) pkt->destruct(pkt);
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pkt->data = NULL; pkt->size = 0;
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}
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}
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#endif
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#endif
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k9AviDecode::k9AviDecode(TQObject *parent, const char *name)
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: TQObject(parent, name) {
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if (glibref==0) {
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CodecHandle=dlopen("libavcodec.so",RTLD_LAZY | RTLD_GLOBAL);
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FormatHandle=dlopen("libavformat.so",RTLD_LAZY | RTLD_GLOBAL);
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}
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if (!CodecHandle) {
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m_error =i18n("Cannot open then library %1").arg("libavcodec");
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return;
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}
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if (!FormatHandle) {
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m_error =i18n("Cannot open then library %1").arg("libavformat");
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return;
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}
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m_error="";
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av_register_all = (av_register_all_t)dlsym(FormatHandle,"av_register_all");
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av_open_input_file = (av_open_input_file_t)dlsym(FormatHandle,"av_open_input_file");
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av_find_stream_info = (av_find_stream_info_t)dlsym(FormatHandle,"av_find_stream_info");
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avcodec_find_decoder =(avcodec_find_decoder_t) dlsym(CodecHandle,"avcodec_find_decoder");
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avcodec_open = (avcodec_open_t)dlsym(CodecHandle,"avcodec_open");
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avcodec_alloc_frame = (avcodec_alloc_frame_t)dlsym(CodecHandle,"avcodec_alloc_frame");
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avpicture_get_size = (avpicture_get_size_t)dlsym(CodecHandle,"avpicture_get_size");
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av_malloc = (av_malloc_t)dlsym(CodecHandle,"av_malloc");
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avpicture_fill = (avpicture_fill_t)dlsym(CodecHandle,"avpicture_fill");
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av_read_frame = (av_read_frame_t)dlsym(FormatHandle,"av_read_frame");
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avcodec_decode_video = (avcodec_decode_video_t)dlsym(CodecHandle,"avcodec_decode_video");
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img_convert = (img_convert_t)dlsym(CodecHandle,"img_convert");
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av_free = (av_free_t)dlsym(CodecHandle,"av_free");
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avcodec_close = (avcodec_close_t)dlsym(FormatHandle,"avcodec_close");
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av_close_input_file = (av_close_input_file_t)dlsym(FormatHandle,"av_close_input_file");
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av_seek_frame=(av_seek_frame_t)dlsym(FormatHandle,"av_seek_frame");
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av_rescale_q=(av_rescale_q_t)dlsym(FormatHandle,"av_rescale_q");
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avcodec_flush_buffers=(avcodec_flush_buffers_t)dlsym(CodecHandle,"avcodec_flush_buffers");
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av_gettime=(av_gettime_t)dlsym(FormatHandle,"av_gettime");
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av_register_all();
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m_opened=false;
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glibref++;
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}
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k9AviDecode::~k9AviDecode() {
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if (m_opened)
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close();
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glibref--;
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if (glibref==0) {
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dlclose(FormatHandle);
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dlclose(CodecHandle);
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}
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}
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#include "k9avidecode.moc"
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bool k9AviDecode::open(const TQString & _fileName) {
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m_error="";
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if (m_opened)
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close();
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// Open video file
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if (av_open_input_file(&m_FormatCtx, _fileName.utf8(), NULL, 0, NULL)!=0) {
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m_error=i18n("Couldn't open the file %1").arg(_fileName);
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return false; // Couldn't open file}
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}
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// Retrieve stream information
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if (av_find_stream_info(m_FormatCtx)<0) {
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m_error =i18n("Couldn't find stream information");
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return false; // Couldn't find stream information
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}
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int i;
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// Find the first video stream
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m_videoStream=-1;
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for (i=0; i<m_FormatCtx->nb_streams; i++)
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if (m_FormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
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m_videoStream=i;
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break;
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}
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if (m_videoStream==-1) {
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m_error=i18n("The file doesn't contain any video stream");
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return false; // Didn't find a video stream
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}
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// Get a pointer to the codec context for the video stream
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m_CodecCtx=m_FormatCtx->streams[m_videoStream]->codec;
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// Find the decoder for the video stream
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m_Codec=avcodec_find_decoder(m_CodecCtx->codec_id);
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if (m_Codec==NULL) {
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m_error=i18n("Unsupported codec");
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return false; // Codec not found
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}
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// Open codec
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if (avcodec_open(m_CodecCtx, m_Codec)<0) {
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m_error =i18n("Could'nt open the codec");
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return false; // Could not open codec
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}
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// Allocate video frame
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m_Frame=avcodec_alloc_frame();
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// Allocate an AVFrame structure
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m_FrameRGB=avcodec_alloc_frame();
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if (m_FrameRGB==NULL) {
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m_error =i18n ("Unable to allocate memory for frames");
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return false;
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}
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int numBytes;
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// Determine required buffer size and allocate buffer
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numBytes=avpicture_get_size(PIX_FMT_RGB24, m_CodecCtx->width,
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m_CodecCtx->height);
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m_buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
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// Assign appropriate parts of buffer to image planes in pFrameRGB
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// Note that pFrameRGB is an AVFrame, but AVFrame is a superset
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// of AVPicture
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avpicture_fill((AVPicture *)m_FrameRGB, m_buffer, PIX_FMT_RGB24,
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m_CodecCtx->width, m_CodecCtx->height);
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m_duration=(double)m_FormatCtx->duration / AV_TIME_BASE;
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m_opened=true;
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m_fileName=_fileName;
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return true;
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}
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void k9AviDecode::seek(double _seconds) {
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AVRational time_base = m_FormatCtx->streams[m_videoStream]->time_base;
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int64_t fspos = (int64_t)(_seconds * AV_TIME_BASE);
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fspos=av_rescale_q(fspos, AV_TIME_BASE_Q, time_base);
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int i=av_seek_frame(m_FormatCtx, m_videoStream, fspos, AVSEEK_FLAG_BACKWARD );
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double pos=av_gettime() / 1000000;
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}
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void k9AviDecode::readFrame(double _seconds) {
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AVRational time_base = m_FormatCtx->streams[m_videoStream]->time_base;
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int64_t fspos = (int64_t)(_seconds * AV_TIME_BASE);
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fspos=av_rescale_q(fspos, AV_TIME_BASE_Q, time_base);
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int res=av_seek_frame(m_FormatCtx, m_videoStream, fspos, AVSEEK_FLAG_BACKWARD );
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avcodec_flush_buffers(m_CodecCtx);
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int frameFinished=0;
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AVPacket packet;
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bool bFound=false;
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while (av_read_frame(m_FormatCtx, &packet)>=0 && !bFound) {
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// Is this a packet from the video stream?
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if (packet.stream_index==m_videoStream) {
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// Decode video frame
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avcodec_decode_video(m_CodecCtx, m_Frame, &frameFinished,
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packet.data, packet.size);
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// Did we get a video frame?
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if (frameFinished) {
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// if (m_Frame->pts >=fspos)
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int64_t cur_dts=fspos;
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if (m_FormatCtx->cur_st)
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cur_dts= m_FormatCtx->cur_st->cur_dts;
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if (cur_dts >=fspos) {
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bFound=true;
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// Convert the image from its native format to RGB
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img_convert((AVPicture *)m_FrameRGB, PIX_FMT_RGB24,
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(AVPicture*)m_Frame, m_CodecCtx->pix_fmt,
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m_CodecCtx->width, m_CodecCtx->height);
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// convert frame to TQImage
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SaveFrame(m_FrameRGB, m_CodecCtx->width,
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m_CodecCtx->height);
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}
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}
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}
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// Free the packet that was allocated by av_read_frame
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av_free_packet(&packet);
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}
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}
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void k9AviDecode::SaveFrame(AVFrame *pFrame, int width, int height) {
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TQImage pix;
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int len =(int) (3*width*height);
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char c[255];
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// Write header
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sprintf(c,"P6\n%d %d\n255\n", width, height);
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char *s= (char*) malloc(len+strlen(c));
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tc_memcpy(s,c,strlen(c));
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tc_memcpy(s+strlen(c),pFrame->data[0], len);
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pix.loadFromData((uchar*)s,strlen(c)+len);
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free(s);
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emit drawFrame( &pix);
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}
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void k9AviDecode::close() {
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if (m_opened) {
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// Free the RGB image
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av_free(m_buffer);
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av_free(m_FrameRGB);
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// Free the YUV frame
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av_free(m_Frame);
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// Close the codec
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avcodec_close(m_CodecCtx);
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// Close the video file
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av_close_input_file(m_FormatCtx);
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m_opened=false;
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}
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}
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double k9AviDecode::getDuration() const {
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return m_duration;
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}
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bool k9AviDecode::opened() const {
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return m_opened;
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}
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TQString k9AviDecode::getFileName() const {
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return m_fileName;
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}
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TQString k9AviDecode::getError() const {
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return m_error;
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}
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