From bed87bc89a1258d3b3dc429f3df114c8c2655a6a Mon Sep 17 00:00:00 2001 From: trialuser02 Date: Sat, 25 Oct 2008 20:58:48 +0000 Subject: aac plugin git-svn-id: http://svn.code.sf.net/p/qmmp-dev/code/trunk/qmmp@601 90c681e8-e032-0410-971d-27865f9a5e38 --- src/plugins/Input/aac/aacfile.cpp | 120 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 120 insertions(+) create mode 100644 src/plugins/Input/aac/aacfile.cpp (limited to 'src/plugins/Input/aac/aacfile.cpp') diff --git a/src/plugins/Input/aac/aacfile.cpp b/src/plugins/Input/aac/aacfile.cpp new file mode 100644 index 000000000..9cf3184d8 --- /dev/null +++ b/src/plugins/Input/aac/aacfile.cpp @@ -0,0 +1,120 @@ +/*************************************************************************** + * Copyright (C) 2008 by Ilya Kotov * + * forkotov02@hotmail.ru * + * * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. * + * * + * This program 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 General Public License for more details. * + * * + * You should have received a copy of the GNU General Public License * + * along with this program; if not, write to the * + * Free Software Foundation, Inc., * + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * + ***************************************************************************/ + +#include + +#include + +#include "aacfile.h" + +#define MAX_CHANNELS 6 + +static int adts_sample_rates[] = {96000,88200,64000,48000,44100,32000,24000,22050,16000,12000,11025,8000,7350,0,0,0}; + +AACFile::AACFile(QIODevice *i) +{ + m_length = 0; + m_bitrate = 0; + m_input = i; + parseADTS(); +} + +AACFile::~AACFile() +{ +} + +qint64 AACFile::length() +{ + return m_length; +} + +quint32 AACFile::bitrate() +{ + return m_bitrate; +} + +void AACFile::parseADTS() +{ + uchar *buf = new uchar[FAAD_MIN_STREAMSIZE*MAX_CHANNELS]; + qint64 buf_at = 0; + int frames, frame_length; + int t_framelength = 0; + int samplerate = 0; + float frames_per_sec, bytes_per_frame; + qint64 pos = m_input->pos(); + + m_input->seek(0); + + buf_at = m_input->read((char *)buf, FAAD_MIN_STREAMSIZE*MAX_CHANNELS); + + for (int i = 0; i < buf_at - 1; i++) + { + if (buf[i] == 0xff && (buf[i+1]&0xf6) == 0xf0) + { + memmove (buf, buf + i, buf_at - i); + buf_at -= i; + break; + } + } + + /* Read all frames to ensure correct time and bitrate */ + for (frames = 0; /* */; frames++) + { + //qDebug("frame header = %d", buf[0]); + buf_at += m_input->read((char *)buf + buf_at, FAAD_MIN_STREAMSIZE*MAX_CHANNELS - buf_at); + + if (buf_at > 7) + { + /* check syncword */ + if (!((buf[0] == 0xFF)&&((buf[1] & 0xF6) == 0xF0))) + break; + + if (frames == 0) + samplerate = adts_sample_rates[(buf[2]&0x3c)>>2]; + + frame_length = ((((unsigned int)buf[3] & 0x3)) << 11) + | (((unsigned int)buf[4]) << 3) | (buf[5] >> 5); + + t_framelength += frame_length; + + if (frame_length > buf_at) + break; + + buf_at -= frame_length; + memmove(buf, buf + frame_length, buf_at); + } + else + { + break; + } + } + m_input->seek(pos); + frames_per_sec = (float)samplerate/1024.0f; + if (frames != 0) + bytes_per_frame = (float)t_framelength/(float)(frames*1000); + else + bytes_per_frame = 0; + m_bitrate = (quint32)(8. * bytes_per_frame * frames_per_sec + 0.5); + + if (frames_per_sec != 0) + m_length = frames/frames_per_sec; + else + m_length = 1; +} -- cgit v1.2.3-13-gbd6f