51b45d5602
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18814 a1c6a512-1295-4272-9138-f99709370657
104 lines
3.6 KiB
C
104 lines
3.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 Thom Johansen
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <string.h>
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#include <inttypes.h>
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#include "system.h"
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#include "metadata.h"
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#include "metadata_common.h"
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#include "metadata_parsers.h"
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#include "logf.h"
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#include "replaygain.h"
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static int set_replaygain(struct mp3entry* id3, bool album, long value,
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long used)
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{
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long gain = (int16_t) ((value >> 16) & 0xffff);
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long peak = (uint16_t) (value & 0xffff);
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/* We use a peak value of 0 to indicate a given gain type isn't used. */
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if (peak != 0)
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{
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/* Use the Xing TOC field to store ReplayGain strings for use in the
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* ID3 screen, since Musepack files shouldn't need to use it in any
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* other way.
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*/
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used += parse_replaygain_int(album, gain * 512 / 100, peak << 9,
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id3, id3->toc + used, sizeof(id3->toc) - used);
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}
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return used;
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}
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bool get_musepack_metadata(int fd, struct mp3entry *id3)
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{
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const int32_t sfreqs_sv7[4] = { 44100, 48000, 37800, 32000 };
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uint32_t header[8];
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uint64_t samples = 0;
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int i;
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if (!skip_id3v2(fd, id3))
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return false;
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if (read(fd, header, 4*8) != 4*8) return false;
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/* Musepack files are little endian, might need swapping */
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for (i = 1; i < 8; i++)
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header[i] = letoh32(header[i]);
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if (!memcmp(header, "MP+", 3)) { /* Compare to sig "MP+" */
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unsigned int streamversion;
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header[0] = letoh32(header[0]);
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streamversion = (header[0] >> 24) & 15;
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if (streamversion >= 8) {
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return false; /* SV8 or higher don't exist yet, so no support */
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} else if (streamversion == 7) {
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unsigned int gapless = (header[5] >> 31) & 0x0001;
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unsigned int last_frame_samples = (header[5] >> 20) & 0x07ff;
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unsigned int bufused = 0;
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id3->frequency = sfreqs_sv7[(header[2] >> 16) & 0x0003];
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samples = (uint64_t)header[1]*1152; /* 1152 is mpc frame size */
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if (gapless)
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samples -= 1152 - last_frame_samples;
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else
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samples -= 481; /* Musepack subband synth filter delay */
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bufused = set_replaygain(id3, false, header[3], bufused);
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bufused = set_replaygain(id3, true, header[4], bufused);
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}
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} else {
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return false; /* SV4-6 is not supported anymore */
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}
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id3->vbr = true;
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/* Estimate bitrate, we should probably subtract the various header sizes
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here for super-accurate results */
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id3->length = ((int64_t) samples * 1000) / id3->frequency;
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if (id3->length <= 0)
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{
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logf("mpc length invalid!");
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return false;
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}
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id3->filesize = filesize(fd);
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id3->bitrate = id3->filesize * 8 / id3->length;
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return true;
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}
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