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Implemented getTotalPlayTime for MP3InputStream.

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svn-id: r32322
This commit is contained in:
Johannes Schickel 2008-05-27 13:15:51 +00:00
parent 4512958d74
commit e82295daa3
1 changed files with 67 additions and 0 deletions
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67
sound/mp3.cpp
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@ -63,6 +63,8 @@ protected:
const mad_timer_t _endTime;
mad_timer_t _totalTime;
int32 _totalPlayTime;
mad_stream _stream;
mad_frame _frame;
mad_synth _synth;
@ -87,6 +89,7 @@ public:
bool endOfData() const { return _state == MP3_STATE_EOS; }
bool isStereo() const { return MAD_NCHANNELS(&_frame.header) == 2; }
int getRate() const { return _frame.header.samplerate; }
int32 getTotalPlayTime() const { return _totalPlayTime; }
protected:
void decodeMP3Data();
@ -111,6 +114,70 @@ MP3InputStream::MP3InputStream(Common::SeekableReadStream *inStream, bool dispos
// may read a few bytes beyond the end of the input buffer).
memset(_buf + BUFFER_SIZE, 0, MAD_BUFFER_GUARD);
// Calculate play time
mad_timer_t length;
mad_timer_set(&length, 0, 0, 1000);
mad_timer_add(&length, start);
mad_timer_negate(&length);
if (mad_timer_sign(end) == 0) {
mad_timer_add(&length, end);
} else {
mad_stream_init(&_stream);
mad_frame_init(&_frame);
// Reset the stream data
_inStream->seek(0, SEEK_SET);
// Update state
_state = MP3_STATE_READY;
// Read the first few sample bytes
readMP3Data();
do {
// If necessary, load more data into the stream decoder
if (_stream.error == MAD_ERROR_BUFLEN)
readMP3Data();
while (_state == MP3_STATE_READY) {
_stream.error = MAD_ERROR_NONE;
// Decode the next header. Note: mad_frame_decode would do this for us, too.
// However, for seeking we don't want to decode the full frame (else it would
// be far too slow).
if (mad_header_decode(&_frame.header, &_stream) == -1) {
if (_stream.error == MAD_ERROR_BUFLEN) {
break; // Read more data
} else if (MAD_RECOVERABLE(_stream.error)) {
debug(6, "MP3InputStream: Recoverable error in mad_header_decode (%s)", mad_stream_errorstr(&_stream));
continue;
} else {
warning("MP3InputStream: Unrecoverable error in mad_header_decode (%s)", mad_stream_errorstr(&_stream));
break;
}
}
// Sum up the total playback time so far
mad_timer_add(&length, _frame.header.duration);
}
} while (_state != MP3_STATE_EOS);
mad_synth_finish(&_synth);
mad_frame_finish(&_frame);
// Reinit stream
_state = MP3_STATE_INIT;
}
_totalPlayTime = mad_timer_count(length, MAD_UNITS_MILLISECONDS);
if (numLoops)
_totalPlayTime *= numLoops;
else
_totalPlayTime = kUnknownPlayTime;
// Decode the first chunk of data. This is necessary so that _frame
// is setup and isStereo() and getRate() return correct results.
decodeMP3Data();