5915736dd5
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15874 a1c6a512-1295-4272-9138-f99709370657
118 lines
4 KiB
C
118 lines
4 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2005 Thom Johansen
|
|
*
|
|
* All files in this archive are subject to the GNU General Public License.
|
|
* See the file COPYING in the source tree root for full license agreement.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include <string.h>
|
|
#include <inttypes.h>
|
|
#include "system.h"
|
|
#include "id3.h"
|
|
#include "metadata_common.h"
|
|
#include "logf.h"
|
|
#include "replaygain.h"
|
|
|
|
static int set_replaygain(struct mp3entry* id3, bool album, long value,
|
|
long used)
|
|
{
|
|
long gain = (int16_t) ((value >> 16) & 0xffff);
|
|
long peak = (uint16_t) (value & 0xffff);
|
|
|
|
/* We use a peak value of 0 to indicate a given gain type isn't used. */
|
|
if (peak != 0)
|
|
{
|
|
/* Use the Xing TOC field to store ReplayGain strings for use in the
|
|
* ID3 screen, since Musepack files shouldn't need to use it in any
|
|
* other way.
|
|
*/
|
|
used += parse_replaygain_int(album, gain * 512 / 100, peak << 9,
|
|
id3, id3->toc + used, sizeof(id3->toc) - used);
|
|
}
|
|
|
|
return used;
|
|
}
|
|
|
|
bool get_musepack_metadata(int fd, struct mp3entry *id3)
|
|
{
|
|
const int32_t sfreqs_sv7[4] = { 44100, 48000, 37800, 32000 };
|
|
uint32_t header[8];
|
|
uint64_t samples = 0;
|
|
int i;
|
|
|
|
if (!skip_id3v2(fd, id3))
|
|
return false;
|
|
if (read(fd, header, 4*8) != 4*8) return false;
|
|
/* Musepack files are little endian, might need swapping */
|
|
for (i = 1; i < 8; i++)
|
|
header[i] = letoh32(header[i]);
|
|
if (!memcmp(header, "MP+", 3)) { /* Compare to sig "MP+" */
|
|
unsigned int streamversion;
|
|
|
|
header[0] = letoh32(header[0]);
|
|
streamversion = (header[0] >> 24) & 15;
|
|
if (streamversion >= 8) {
|
|
return false; /* SV8 or higher don't exist yet, so no support */
|
|
} else if (streamversion == 7) {
|
|
unsigned int gapless = (header[5] >> 31) & 0x0001;
|
|
unsigned int last_frame_samples = (header[5] >> 20) & 0x07ff;
|
|
unsigned int bufused = 0;
|
|
|
|
id3->frequency = sfreqs_sv7[(header[2] >> 16) & 0x0003];
|
|
samples = (uint64_t)header[1]*1152; /* 1152 is mpc frame size */
|
|
if (gapless)
|
|
samples -= 1152 - last_frame_samples;
|
|
else
|
|
samples -= 481; /* Musepack subband synth filter delay */
|
|
|
|
bufused = set_replaygain(id3, false, header[3], bufused);
|
|
bufused = set_replaygain(id3, true, header[4], bufused);
|
|
}
|
|
} else {
|
|
header[0] = letoh32(header[0]);
|
|
unsigned int streamversion = (header[0] >> 11) & 0x03FF;
|
|
if (streamversion != 4 && streamversion != 5 && streamversion != 6)
|
|
return false;
|
|
id3->frequency = 44100;
|
|
id3->track_gain = 0;
|
|
id3->track_peak = 0;
|
|
id3->album_gain = 0;
|
|
id3->album_peak = 0;
|
|
|
|
if (streamversion >= 5)
|
|
samples = (uint64_t)header[1]*1152; // 32 bit
|
|
else
|
|
samples = (uint64_t)(header[1] >> 16)*1152; // 16 bit
|
|
|
|
samples -= 576;
|
|
if (streamversion < 6)
|
|
samples -= 1152;
|
|
}
|
|
|
|
id3->vbr = true;
|
|
/* Estimate bitrate, we should probably subtract the various header sizes
|
|
here for super-accurate results */
|
|
id3->length = ((int64_t) samples * 1000) / id3->frequency;
|
|
|
|
if (id3->length <= 0)
|
|
{
|
|
logf("mpc length invalid!");
|
|
return false;
|
|
}
|
|
|
|
id3->filesize = filesize(fd);
|
|
id3->bitrate = id3->filesize * 8 / id3->length;
|
|
return true;
|
|
}
|