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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003 The ScummVM project
*
* 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.
*
* $Header$
*
*/
#include "stdafx.h"
#include "sound/mp3.h"
#include "common/file.h"
#include "common/util.h"
#ifdef USE_MAD
MP3TrackInfo::MP3TrackInfo(File *file) {
struct mad_stream stream;
struct mad_frame frame;
unsigned char buffer[8192];
unsigned int buflen = 0;
int count = 0;
// Check the format and bitrate
mad_stream_init(&stream);
mad_frame_init(&frame);
while (1) {
if (buflen < sizeof(buffer)) {
int bytes;
bytes = file->read(buffer + buflen, sizeof(buffer) - buflen);
if (bytes <= 0) {
if (bytes == -1) {
warning("Invalid file format");
goto error;
}
break;
}
buflen += bytes;
}
mad_stream_buffer(&stream, buffer, buflen);
while (1) {
if (mad_frame_decode(&frame, &stream) == -1) {
if (!MAD_RECOVERABLE(stream.error))
break;
if (stream.error != MAD_ERROR_BADCRC)
continue;
}
if (count++)
break;
}
if (count || stream.error != MAD_ERROR_BUFLEN)
break;
memmove(buffer, stream.next_frame,
buflen = &buffer[buflen] - stream.next_frame);
}
if (count)
memcpy(&_mad_header, &frame.header, sizeof(mad_header));
else {
warning("Invalid file format");
goto error;
}
mad_frame_finish(&frame);
mad_stream_finish(&stream);
// Get file size
_size = file->size();
_file = file;
_error_flag = false;
return;
error:
mad_frame_finish(&frame);
mad_stream_finish(&stream);
_error_flag = true;
delete file;
}
int MP3TrackInfo::play(SoundMixer *mixer, PlayingSoundHandle *handle, int startFrame, int duration) {
unsigned int offset;
mad_timer_t durationTime;
// Calc offset. As all bitrates are in kilobit per seconds, the division by 200 is always exact
offset = (startFrame * (_mad_header.bitrate / (8 * 25))) / 3;
_file->seek(offset, SEEK_SET);
// Calc delay
if (!duration) {
// FIXME: Using _size here is a problem if offset (or equivalently
// startFrame) is non-zero.
mad_timer_set(&durationTime, (_size * 8) / _mad_header.bitrate,
(_size * 8) % _mad_header.bitrate, _mad_header.bitrate);
} else {
mad_timer_set(&durationTime, duration / 75, duration % 75, 75);
}
// Play it
return mixer->playMP3CDTrack(handle, _file, durationTime);
}
MP3TrackInfo::~MP3TrackInfo() {
if (! _error_flag)
_file->close();
}
#endif
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