Add even more of the source
This should be about everything needed to build so far?
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593
MP3Broadcaster/MP3FileBroadcaster.cpp
Executable file
593
MP3Broadcaster/MP3FileBroadcaster.cpp
Executable file
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/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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#include "MP3FileBroadcaster.h"
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#include <fcntl.h>
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//#include <unistd.h>
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#include <stdio.h>
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#include "OS.h"
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#include "OSThread.h"
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int gBitRateArray[] = { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0 };
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int gFrequencyArray[] = { 44100, 48000, 32000, 0 };
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int gBitRateArrayv2[] = { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 };
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int gFrequencyArrayv2[] = { 22050, 24000, 16000, 0 };
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int gFrequencyArrayv2_5[] = { 11025, 12000, 8000, 0 };
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MP3FileBroadcaster::MP3FileBroadcaster(TCPSocket* socket, int bitrate, int frequency, int bufferSize) :
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mSocket(socket),
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mBitRate(bitrate),
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mBufferSize(bufferSize),
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mNumFramesSent(0),
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mBroadcastStartTime(0),
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mBuffer(NULL),
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mUpdater(NULL),
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mDesiredBitRate(bitrate),
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mDesiredFrequency(frequency)
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{
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mBuffer = new unsigned char[bufferSize];
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mTitle[0] = 0;
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mArtist[0] = 0;
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mSong[0] = 0;
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}
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MP3FileBroadcaster::~MP3FileBroadcaster()
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{
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delete [] mBuffer;
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}
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int MP3FileBroadcaster::PlaySong(char *fileName, char *currentFile, bool preflight, bool fastpreflight)
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{
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UInt32 length, lengthSent;
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if (mBuffer == NULL)
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return -1;
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mFile.Set(fileName);
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if (!mFile.IsValid())
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return kCouldntOpenFile;
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CheckForTags();
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if (strlen(mTitle) == 0)
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{
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char* temp = fileName+strlen(fileName);
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while ((temp > fileName) && (*(temp-1) != kPathDelimiterChar))
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temp--;
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::strncpy(mTitle, temp,sizeof(mTitle) -1);
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mTitle[sizeof(mTitle) -1] = 0;
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}
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if (strlen(mArtist) != 0 && strlen(mAlbum) != 0)
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qtss_sprintf(mSong, "%s - %s (%s)", mTitle, mArtist, mAlbum);
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else if (strlen(mArtist) != 0)
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qtss_sprintf(mSong, "%s - %s", mTitle, mArtist);
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else
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::strcpy(mSong, mTitle);
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if (preflight)
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qtss_printf("Preflighting %s\n", mSong);
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// skip all the padding at the beginning of the file
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mFile.Seek(mStartByte);
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bool done = false;
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OS_Error err = mFile.Read(mBuffer, mBufferSize, &length);
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if (err != OS_NoErr)
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return -1;
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for(UInt32 i = 0; i<length-1000; i++)
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{
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if ((mBuffer[i] == 0xff) && CheckHeaders(mBuffer + i) )
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{
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mStartByte += i;
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done = true;
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break;
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}
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}
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if (!done)
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{
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mFile.Close();
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return kBadFileFormat;
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}
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if (mDesiredBitRate && (mBitRate != mDesiredBitRate))
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{
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qtss_printf("File %s : ",fileName);
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qtss_printf("Bitrate = %dkbits, frequency = %dKHz\n", mBitRate, mFrequency/1000);
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mFile.Close();
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return kWrongBitRate;
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}
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if (mDesiredFrequency == -1)
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{
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mDesiredFrequency = mFrequency;
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qtss_printf("Setting required frequency to %dKHz\n", mFrequency/1000);
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}
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if (mDesiredFrequency && (mFrequency != mDesiredFrequency))
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{
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qtss_printf("File %s : ",fileName);
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qtss_printf("Bitrate = %dkbits, frequency = %dKHz\n", mBitRate, mFrequency/1000);
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mFile.Close();
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return kWrongFrequency;
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}
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if (mUpdater)
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mUpdater->RequestMetaInfoUpdate(mSong);
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mFile.Seek(mStartByte);
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if (mBroadcastStartTime == 0)
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mBroadcastStartTime = OS::Milliseconds();
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//unused UInt64 startTime = OS::Milliseconds();
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int totalBytes = 0;
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//unused int numFrames = 0; // amount of play time this buffer represents
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int leftOver = 0; // we may have a partial buffer left over from last read
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SInt64 properElapsedTime;
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while(true)
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{
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if (!preflight)
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{
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// the time length each frame represents depends on the frequency
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int numSamplesPerFrame = mIsMPEG2 ? 576 : 1152; // these are MP3 standards
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properElapsedTime = mNumFramesSent * numSamplesPerFrame * 1000 / mFrequency; // frequency is samples per second
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SInt64 nextSendTime = mBroadcastStartTime + properElapsedTime;
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SInt64 currentTime = OS::Milliseconds();
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if (nextSendTime > currentTime)
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OSThread::Sleep( (UInt32) (nextSendTime - currentTime));
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}
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length = 0;
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err = mFile.Read(mBuffer + leftOver, mBufferSize - leftOver, &length);
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if ((err != OS_NoErr) || (length == 0))
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break;
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length += leftOver;
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mNumFramesSent += CountFrames(mBuffer, length, &leftOver);
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if (!preflight)
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{
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OS_Error err = mSocket->Send((char*)mBuffer, length - leftOver, &lengthSent);
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if (err != 0)
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{
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mFile.Close();
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return kConnectionError;
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}
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}
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totalBytes += length;
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if (leftOver > 0)
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::memcpy(mBuffer, mBuffer+length-leftOver, leftOver);
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if (preflight && fastpreflight && (totalBytes > 20 * 1024))
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break; // just check first 20K of file
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}
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// UInt64 elapsed = OS::Milliseconds() - startTime;
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// UInt64 rate = (UInt64)totalBytes * 8 * 1000 / elapsed;
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// qtss_printf("Sent %d bytes in %qd milliseconds = %qd bits per second\n", totalBytes, elapsed, rate);
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if ((mDesiredFrequency == 0) || preflight)
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{
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// if we aren't fixing the frequency, then we need to time each song seperately
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mBroadcastStartTime = OS::Milliseconds();
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mNumFramesSent = 0;
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}
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mFile.Close();
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return 0;
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}
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void MP3FileBroadcaster::CheckForTags()
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{
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mArtist[0] = 0;
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mTitle[0] = 0;
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mAlbum[0] = 0;
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mStartByte = 0;
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if (ReadV2_3Tags())
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return;
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if (ReadV2_2Tags())
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return;
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if (ReadV1Tags())
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return;
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return;
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}
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bool MP3FileBroadcaster::ReadV1Tags()
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{
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char buffer[128] = "";
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UInt32 length = 0;
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int i;
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mFile.Seek(mFile.GetLength()-128);
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OS_Error err = mFile.Read(buffer, sizeof(buffer), &length);
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if ((err != OS_NoErr) || (length != 128))
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return false;
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if (strncmp(buffer, "TAG", 3))
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return false;
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// Song Title
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// stored as space padded 30 byte buffer (no null termination)
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memcpy(mTitle, buffer+3, 30);
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for (i = 29; i>=0; i--)
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if (mTitle[i] != ' ')
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{
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mTitle[i+1] = 0;
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break;
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}
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// Artist Name
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// stored as space padded 30 byte buffer (no null termination)
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memcpy(mArtist, buffer+33, 30);
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for (i = 29; i>=0; i--)
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if (mArtist[i] != ' ')
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{
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mArtist[i+1] = 0;
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break;
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}
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// Album Title
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// stored as space padded 30 byte buffer (no null termination)
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memcpy(mAlbum, buffer+63, 30);
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for (i = 29; i>=0; i--)
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if (mAlbum[i] != ' ')
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{
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mAlbum[i+1] = 0;
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break;
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}
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return true;
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}
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bool MP3FileBroadcaster::ReadV2_2Tags()
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{
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char buffer[1024] = "";
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UInt32 length = 0;
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mFile.Seek(0);
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OS_Error err = mFile.Read(buffer, sizeof(buffer), &length);
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if (err)
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return false;
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if (length < 4) // tag header size
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return false;
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if (strncmp(buffer, "ID3", 3))
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return false;
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if (buffer[3] != 2)
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return false;
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// we have a valid v2.2 tag header
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char* ptr = buffer + 10;
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// the total length of tags is encoded in this strange way to avoid being
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// interpreted as an MP3 "sync" flag (don't use the top bit of each byte).
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int totalTagLen = buffer[6]*2097152+buffer[7]*16384+buffer[8]*128+buffer[9];
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mStartByte = totalTagLen; // skip tags when streaming
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// OK, I'm being lazy here, but if someone can't find a way to put the song
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// title and artist in the first 1K of header then they're just being plain mean.
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if (totalTagLen > 1024) totalTagLen = 1024;
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while (ptr-buffer < totalTagLen)
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{
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if (*ptr == 0)
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break;
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// next three bytes are length, so go two bytes, copy 4 and mask off one
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int fieldLen = ntohl(OS::GetUInt32FromMemory((UInt32*)(ptr+2))) & 0x00ffffff;
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if (!strncmp(ptr, "TP1", 3)) // Artist
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{
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int len = fieldLen;
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if (len > 255) len = 255;
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if (ptr[6] == 0)
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{
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::memcpy(mArtist, ptr+7, len-1); // skip encoding byte
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mArtist[len-1] = 0;
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}
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else
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ConvertUTF16toASCII(ptr+7, len-1, mArtist, sizeof(mArtist));
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}
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if (!strncmp(ptr, "TT2", 3)) // Title
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{
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int len = fieldLen;
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if (len > 255) len = 255;
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if (ptr[6] == 0)
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{
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::memcpy(mTitle, ptr+7, len-1); // skip encoding byte
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mTitle[len-1] = 0;
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}
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else
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ConvertUTF16toASCII(ptr+7, len-1, mTitle, sizeof(mTitle));
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}
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if (!strncmp(ptr, "TAL", 3)) // Album
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{
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int len = fieldLen;
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if (len > 255) len = 255;
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if (ptr[6] == 0)
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{
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::memcpy(mAlbum, ptr+7, len-1); // skip encoding byte
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mAlbum[len-1] = 0;
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}
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else
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ConvertUTF16toASCII(ptr+7, len-1, mAlbum, sizeof(mAlbum));
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}
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if ((strlen(mTitle) > 0) && (strlen(mArtist) > 0) && (strlen(mAlbum) > 0))
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break; // we found the tags we need
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ptr += fieldLen + 6; // skip field and header
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}
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return true;
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}
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bool MP3FileBroadcaster::ReadV2_3Tags()
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{
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char buffer[1024];
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UInt32 length;
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mFile.Seek(0);
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OS_Error err = mFile.Read(buffer, sizeof(buffer), &length);
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if (err)
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return false;
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if (strncmp(buffer, "ID3", 3))
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return false;
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if (buffer[3] != 3)
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return false;
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// we have a valid v2.3 tag header
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char* ptr = buffer + 10;
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// skip extended header if it exists
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if ((buffer[4] & 0x40) != 0)
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ptr += 10;
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// if any other flags are set (like "unsychronization"), bail.
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// these can be supported in the future.
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if (((buffer[4] & 0xbf) != 0) || (buffer[5] != 0))
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return false;
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// the total length of tags is encoded in this strange way to avoid being
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// interpreted as an MP3 "sync" flag (don't use the top bit of each byte).
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int totalTagLen = buffer[6]*2097152+buffer[7]*16384+buffer[8]*128+buffer[9];
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mStartByte = totalTagLen; // skip tags when streaming
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// OK, I'm being lazy here, but if someone can't find a way to put the song
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// title and artist in the first 1K of header then they're just being plain mean.
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if (totalTagLen > 1024) totalTagLen = 1024;
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while (ptr-buffer < totalTagLen)
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{
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if (*ptr == 0)
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break;
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int fieldLen = ntohl(OS::GetUInt32FromMemory((UInt32*)(ptr+4)));
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// should check compression and encryption flags for these fields, but I
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// wouldn't really expect them to be set for title or artist
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if (!::strncmp(ptr, "TPE1", 4)) // Artist
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{
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int len = fieldLen;
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if (len > 255) len = 255;
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if (ptr[10] == 0)
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{
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::memcpy(mArtist, ptr+11, len-1); // skip encoding byte
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mArtist[len-1] = 0;
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}
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else
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ConvertUTF16toASCII(ptr+11, len-1, mArtist, sizeof(mArtist));
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}
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if (!strncmp(ptr, "TIT2", 4)) // Title
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{
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int len = fieldLen;
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if (len > 255) len = 255;
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if (ptr[10] == 0)
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{
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::memcpy(mTitle, ptr+11, len-1); // skip encoding byte
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mTitle[len-1] = 0;
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}
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else
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ConvertUTF16toASCII(ptr+11, len-1, mTitle, sizeof(mTitle));
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}
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if (!strncmp(ptr, "TALB", 4)) // Album
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{
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int len = fieldLen;
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if (len > 255) len = 255;
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if (ptr[10] == 0)
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{
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::memcpy(mAlbum, ptr+11, len-1); // skip encoding byte
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mAlbum[len-1] = 0;
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}
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else
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ConvertUTF16toASCII(ptr+11, len-1, mAlbum, sizeof(mAlbum));
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}
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if ((::strlen(mTitle) > 0) && (::strlen(mArtist) > 0) && (::strlen(mAlbum) > 0))
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break; // we found the tags we need
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ptr += fieldLen + 10; // skip field and header
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}
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return true;
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}
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bool MP3FileBroadcaster::CheckHeaders(unsigned char * buffer)
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{
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int bitRate, bitRate2;
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int frequency, frequency2;
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int recordSize;
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if (!ParseHeader(buffer, &bitRate, &frequency, &recordSize))
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return false;
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if (!ParseHeader(buffer + recordSize, &bitRate2, &frequency2, &recordSize))
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return false;
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if (frequency != frequency2)
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return false;
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mBitRate = bitRate;
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mFrequency = frequency;
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return true;
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}
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bool MP3FileBroadcaster::ParseHeader(unsigned char* buffer, int* bitRate, int* frequency, int* recordSize)
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{
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if ((buffer[0] != 0xff) || ((buffer[1] & 0xe6) != 0xe2))
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return false; // not a valid MP3 header (not valid or not layer 3)
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int version = (buffer[1] & 0x18) >> 3;
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mIsMPEG2 = (version != 3);
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if (mIsMPEG2)
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*bitRate = gBitRateArrayv2[buffer[2] >> 4]; // MPEG2
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else
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*bitRate = gBitRateArray[buffer[2] >> 4]; // MPEG 1
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if (version == 3)
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||||
*frequency = gFrequencyArray[(buffer[2] & 0x0a) >> 2];
|
||||
else if (version == 2)
|
||||
*frequency = gFrequencyArrayv2[(buffer[2] & 0x0a) >> 2];
|
||||
else
|
||||
*frequency = gFrequencyArrayv2_5[(buffer[2] & 0x0a) >> 2];
|
||||
|
||||
if ((*bitRate == 0) || (*frequency == 0))
|
||||
return false;
|
||||
|
||||
int pad = (buffer[2] & 0x02) >> 1;
|
||||
|
||||
*recordSize = 144000 * *bitRate / *frequency; // standard MP3 calculation
|
||||
|
||||
// MPEG 2 (and 2.5) frames encode half the number of samples
|
||||
if (mIsMPEG2)
|
||||
*recordSize /= 2;
|
||||
|
||||
*recordSize += pad;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
int MP3FileBroadcaster::CountFrames(unsigned char* buffer, UInt32 length, int* leftOver)
|
||||
{
|
||||
int bitRate;
|
||||
int frequency;
|
||||
int recordSize;
|
||||
|
||||
UInt32 offset = 0;
|
||||
int numFrames = 0;
|
||||
while ( offset < length)
|
||||
{
|
||||
if (length - offset < 4)
|
||||
break; // we don't have a whole header left, so move on
|
||||
|
||||
if (!ParseHeader(buffer + offset, &bitRate, &frequency, &recordSize))
|
||||
{
|
||||
// Oops, we lost our stream, so advance byte by byte looking for a frame header
|
||||
offset++;
|
||||
continue;
|
||||
}
|
||||
|
||||
if ( ((UInt32) recordSize + offset) > length)
|
||||
break; // we don't have the whole frame in this buffer.
|
||||
|
||||
numFrames++;
|
||||
|
||||
offset += recordSize;
|
||||
}
|
||||
|
||||
// usually there will be a partial frame left over. We leave this for next time.
|
||||
*leftOver = length - offset;
|
||||
|
||||
return numFrames;
|
||||
}
|
||||
|
||||
// We really should be converting from Unicode to Latin-1, but the conversion of the high byte characters isn't
|
||||
// easy. If I find some code or tables to do this I can include it later.
|
||||
bool MP3FileBroadcaster::ConvertUTF16toASCII(char* sourceStr,int sourceSize, char* dest, int destSize)
|
||||
{
|
||||
unsigned short *sourceStart = (unsigned short *)sourceStr;
|
||||
unsigned short *sourceEnd = (unsigned short *)(sourceStart + sourceSize);
|
||||
unsigned char *targetStart = (unsigned char *)dest;
|
||||
unsigned char *targetEnd = targetStart + destSize;
|
||||
|
||||
bool result = true;
|
||||
unsigned short *source = sourceStart;
|
||||
unsigned char *target = targetStart;
|
||||
unsigned short ch;
|
||||
bool doSwap = false;
|
||||
ch = *source++;
|
||||
Assert((ch == 0xfffe) || (ch == 0xfeff));
|
||||
if (ch != 0xfeff)
|
||||
doSwap = true;
|
||||
|
||||
while ((source < sourceEnd) && (target <= targetEnd))
|
||||
{
|
||||
ch = *source++;
|
||||
if (doSwap)
|
||||
{
|
||||
unsigned short low = (ch & 0xff) << 8;
|
||||
ch = (ch >> 8) | low;
|
||||
}
|
||||
|
||||
if (ch < 0x80)
|
||||
{
|
||||
*target = (UInt8) ch;
|
||||
target++;
|
||||
}
|
||||
}
|
||||
|
||||
if (target <= targetEnd)
|
||||
*target = 0;
|
||||
else
|
||||
result = false;
|
||||
|
||||
return result;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue