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/*
* dxr3pesframe.c
*
* Copyright (C) 2002-2004 Kai Möller
* Copyright (C) 2009 Christian Gmeiner
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "dxr3pesframe.h"
#include <linux/em8300.h>
#include <vdr/tools.h>
// ==================================
bool cDxr3PesFrame::parse(const uint8_t *pes, uint32_t length)
{
// look if at the beginning there is the pes packet start indicator
if (pes[0] != 0 || pes[1] != 0 || pes[2] != 1) {
esyslog("[cDxr3PesFrame]: no start indicator found...");
return false;
}
// handle stream id
switch (pes[3]) {
case 0xBD: // private stream 1
m_pesDataType = PES_PRIVATE_DATA;
break;
case 0xC0 ... 0xDF: // audio stream
m_pesDataType = PES_AUDIO_DATA;
break;
case 0xE0 ... 0xEF: // video stream
m_pesDataType = PES_VIDEO_DATA;
break;
default:
return false;
}
// store start of pes frame
m_pesStart = pes;
// read pes header len
uint8_t pesHeaderDataLength = pes[8];
// look if there is a pts
if (pes[7] & (1 << 7)) {
// read pts
uint64_t pts = (((int64_t)pes[ 9]) & 0x0e) << 29;
pts |= ( (int64_t)pes[10]) << 22;
pts |= (((int64_t)pes[11]) & 0xfe) << 14;
pts |= ( (int64_t)pes[12]) << 7;
pts |= (((int64_t)pes[13]) & 0xfe) >> 1;
m_pts = pts >> 1;
}
// set pointer to start of payload
int payloadStart = 9 + pesHeaderDataLength;
m_payload = &pes[payloadStart];
m_payloadLength = length - payloadStart;
if (m_pesDataType == PES_VIDEO_DATA) {
// we can get some informations about the video payload
// of this pes frame. For more informations have a look
// at http://dvd.sourceforge.net/dvdinfo/mpeghdrs.html
const uint8_t *video = &pes[payloadStart];
// look if there is the start code prefix (0000 0000 0000 0000 0000 0001)
if (video[0] != 0 || video[1] != 0 || video[2] != 1) {
return true;
}
// check stream id
if (video[3] == 0xb3) {
// in the sequence header we get informations about horizontal
// and vertical size of the video and the current aspect ratio.
m_horizontalSize = (video[5] & 0xf0) >> 4 | video[4] << 4;
m_verticalSize = (video[5] & 0x0f) << 8 | video[6];
switch (video[7] & 0xf0) {
case 0x20:
m_aspectRatio = EM8300_ASPECTRATIO_4_3;
break;
case 0x30:
m_aspectRatio = EM8300_ASPECTRATIO_16_9;
break;
}
m_staticAspectRatio = m_aspectRatio;
}
}
return true;
}
// ==================================
uint32_t cDxr3PesFrame::m_staticAspectRatio = EM8300_ASPECTRATIO_4_3;
// Local variables:
// mode: c++
// c-file-style: "stroustrup"
// c-file-offsets: ((inline-open . 0))
// tab-width: 4;
// indent-tabs-mode: nil
// End:
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