void MPEG1or2AudioStreamFramer::continueReadProcessing() {
unsigned acquiredFrameSize = fParser->parse(fNumTruncatedBytes);
if (acquiredFrameSize > 0) {
// We were able to acquire a frame from the input.
// It has already been copied to the reader's space.
fFrameSize = acquiredFrameSize;
// Also set the presentation time, and increment it for next time,
// based on the length of this frame:
fPresentationTime = fNextFramePresentationTime;
struct timeval framePlayTime = currentFramePlayTime();
fDurationInMicroseconds = framePlayTime.tv_sec*MILLION + framePlayTime.tv_usec;
fNextFramePresentationTime.tv_usec += framePlayTime.tv_usec;
fNextFramePresentationTime.tv_sec
+= framePlayTime.tv_sec + fNextFramePresentationTime.tv_usec/MILLION;
fNextFramePresentationTime.tv_usec %= MILLION;
// Call our own 'after getting' function. Because we're not a 'leaf'
// source, we can call this directly, without risking infinite recursion.
afterGetting(this);
} else {
// We were unable to parse a complete frame from the input, because:
// - we had to read more data from the source stream, or
// - the source stream has ended.
}
}
float MP3StreamState::filePlayTime() const {
unsigned numFramesInFile = fNumFramesInFile;
if (numFramesInFile == 0) {
// Estimate the number of frames from the file size, and the
// size of the current frame:
numFramesInFile = fFileSize/(4 + fCurrentFrame.frameSize);
}
struct timeval const pt = currentFramePlayTime();
return numFramesInFile*(pt.tv_sec + pt.tv_usec/(float)MILLION);
}
unsigned MP3StreamState::findNextHeader(struct timeval& presentationTime) {
presentationTime = fNextFramePresentationTime;
if (!findNextFrame()) return 0;
// From this frame, figure out the *next* frame's presentation time:
struct timeval framePlayTime = currentFramePlayTime();
if (fPresentationTimeScale > 1) {
// Scale this value
unsigned secondsRem = framePlayTime.tv_sec % fPresentationTimeScale;
framePlayTime.tv_sec -= secondsRem;
framePlayTime.tv_usec += secondsRem*MILLION;
framePlayTime.tv_sec /= fPresentationTimeScale;
framePlayTime.tv_usec /= fPresentationTimeScale;
}
fNextFramePresentationTime.tv_usec += framePlayTime.tv_usec;
fNextFramePresentationTime.tv_sec
+= framePlayTime.tv_sec + fNextFramePresentationTime.tv_usec/MILLION;
fNextFramePresentationTime.tv_usec %= MILLION;
return fr().hdr;
}
resultFrameSize = outBufSize;
return False;
}
if (resultFrameSize >= 4) {
unsigned& hdr = fr().hdr;
*outBuf++ = (unsigned char)(hdr>>24);
*outBuf++ = (unsigned char)(hdr>>16);
*outBuf++ = (unsigned char)(hdr>>8);
*outBuf++ = (unsigned char)(hdr);
memmove(outBuf, fr().frameBytes, resultFrameSize-4);
}
struct timeval const pt = currentFramePlayTime();
resultDurationInMicroseconds = pt.tv_sec*MILLION + pt.tv_usec;
return True;
}
void MP3StreamState::getAttributes(char* buffer, unsigned bufferSize) const {
char const* formatStr
= "bandwidth %d MPEGnumber %d MPEGlayer %d samplingFrequency %d isStereo %d playTime %d isVBR %d";
unsigned fpt = (unsigned)(filePlayTime() + 0.5); // rounds to nearest integer
#if defined(IRIX) || defined(ALPHA) || defined(_QNX4) || defined(IMN_PIM) || defined(CRIS)
/* snprintf() isn't defined, so just use sprintf() - ugh! */
sprintf(buffer, formatStr,
fr().bitrate, fr().isMPEG2 ? 2 : 1, fr().layer, fr().samplingFreq, fr().isStereo,
fpt, fIsVBR);
#else
