221 lines
7.9 KiB
C
221 lines
7.9 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2005 Thom Johansen
|
|
* Copyright (C) 2010 Andree Buschmann
|
|
*
|
|
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <inttypes.h>
|
|
#include "platform.h"
|
|
#include "metadata.h"
|
|
#include "metadata_common.h"
|
|
#include "metadata_parsers.h"
|
|
#include "logf.h"
|
|
#include "replaygain.h"
|
|
#include "fixedpoint.h"
|
|
|
|
/* Needed for replay gain and clipping prevention of SV8 files. */
|
|
#define SV8_TO_SV7_CONVERT_GAIN (6482) /* 64.82 * 100, MPC_OLD_GAIN_REF */
|
|
#define SV8_TO_SV7_CONVERT_PEAK (23119) /* 256 * 20 * log10(32768) */
|
|
|
|
static int set_replaygain_sv7(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) {
|
|
/* Save the ReplayGain data to id3-structure for further processing. */
|
|
parse_replaygain_int(album, gain * 512 / 100, peak << 9, id3);
|
|
}
|
|
|
|
return used;
|
|
}
|
|
|
|
static int set_replaygain_sv8(struct mp3entry* id3,
|
|
bool album,
|
|
long gain,
|
|
long peak,
|
|
long used)
|
|
{
|
|
gain = (long)(SV8_TO_SV7_CONVERT_GAIN - ((gain*100)/256));
|
|
|
|
/* Transform SV8's logarithmic peak representation to the desired linear
|
|
* representation: linear = pow(10, peak/256/20).
|
|
*
|
|
* FP_BITS = 24 bits = desired fp representation for dsp routines
|
|
* FRAC_BITS = 12 bits = resolution used for fp_bits
|
|
* fp_factor(peak*(1<<FRAC_BITS)/256, FRAC_BITS) << (FP_BITS-FRAC_BITS)
|
|
**/
|
|
peak = (fp_factor((peak-SV8_TO_SV7_CONVERT_PEAK)*16, 12) << 12);
|
|
|
|
/* We use a peak value of 0 to indicate a given gain type isn't used. */
|
|
if (peak != 0) {
|
|
/* Save the ReplayGain data to id3-structure for further processing. */
|
|
parse_replaygain_int(album, gain * 512 / 100, peak, id3);
|
|
}
|
|
|
|
return used;
|
|
}
|
|
|
|
static int sv8_get_size(uint8_t *buffer, int index, uint64_t *p_size)
|
|
{
|
|
unsigned char tmp;
|
|
uint64_t size = 0;
|
|
|
|
do {
|
|
tmp = buffer[index++];
|
|
size = (size << 7) | (tmp & 0x7F);
|
|
} while((tmp & 0x80));
|
|
|
|
*p_size = size;
|
|
return index;
|
|
}
|
|
|
|
bool get_musepack_metadata(int fd, struct mp3entry *id3)
|
|
{
|
|
static const int32_t sfreqs[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 == 7) {
|
|
unsigned int gapless = (header[5] >> 31) & 0x0001;
|
|
unsigned int last_frame_samples = (header[5] >> 20) & 0x07ff;
|
|
unsigned int bufused = 0;
|
|
|
|
id3->frequency = sfreqs[(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_sv7(id3, false, header[3], bufused);
|
|
bufused = set_replaygain_sv7(id3, true , header[4], bufused);
|
|
|
|
id3->codectype = AFMT_MPC_SV7;
|
|
} else {
|
|
return false; /* only SV7 is allowed within a "MP+" signature */
|
|
}
|
|
} else if (!memcmp(header, "MPCK", 4)) { /* Compare to sig "MPCK" */
|
|
uint8_t sv8_header[32];
|
|
/* 4 bytes 'MPCK' */
|
|
lseek(fd, 4, SEEK_SET);
|
|
if (read(fd, sv8_header, 2) != 2) return false; /* read frame ID */
|
|
if (!memcmp(sv8_header, "SH", 2)) { /* Stream Header ID */
|
|
int32_t k = 0;
|
|
uint32_t streamversion;
|
|
uint64_t size = 0; /* tag size */
|
|
uint64_t dummy = 0; /* used to dummy read data from header */
|
|
|
|
/* 4 bytes 'MPCK' + 2 'SH' */
|
|
lseek(fd, 6, SEEK_SET);
|
|
if (read(fd, sv8_header, 32) != 32) return false;
|
|
|
|
/* Read the size of 'SH'-tag */
|
|
k = sv8_get_size(sv8_header, k, &size);
|
|
|
|
/* Skip crc32 */
|
|
k += 4;
|
|
|
|
/* Read stream version */
|
|
streamversion = sv8_header[k++];
|
|
if (streamversion != 8) return false; /* Only SV8 is allowed. */
|
|
|
|
/* Number of samples */
|
|
k = sv8_get_size(sv8_header, k, &samples);
|
|
|
|
/* Number of leading zero-samples */
|
|
k = sv8_get_size(sv8_header, k, &dummy);
|
|
|
|
/* Sampling frequency */
|
|
id3->frequency = sfreqs[(sv8_header[k++] >> 5) & 0x0003];
|
|
|
|
/* Number of channels */
|
|
id3->channels = (sv8_header[k++] >> 4) + 1;
|
|
|
|
/* Skip to next tag: k = size -2 */
|
|
k = size - 2;
|
|
|
|
if (!memcmp(sv8_header+k, "RG", 2)) { /* Replay Gain ID */
|
|
long peak, gain;
|
|
int bufused = 0;
|
|
|
|
k += 2; /* 2 bytes 'RG' */
|
|
|
|
/* sv8_get_size must be called to skip the right amount of
|
|
* bits within the header data. */
|
|
k = sv8_get_size(sv8_header, k, &size);
|
|
|
|
/* Read and set replay gain */
|
|
if (sv8_header[k++] == 1) {
|
|
/* Title's peak and gain */
|
|
gain = (int16_t) ((sv8_header[k]<<8) + sv8_header[k+1]); k += 2;
|
|
peak = (uint16_t)((sv8_header[k]<<8) + sv8_header[k+1]); k += 2;
|
|
bufused += set_replaygain_sv8(id3, false, gain, peak, bufused);
|
|
|
|
/* Album's peak and gain */
|
|
gain = (int16_t) ((sv8_header[k]<<8) + sv8_header[k+1]); k += 2;
|
|
peak = (uint16_t)((sv8_header[k]<<8) + sv8_header[k+1]); k += 2;
|
|
bufused += set_replaygain_sv8(id3, true , gain, peak, bufused);
|
|
}
|
|
}
|
|
|
|
id3->codectype = AFMT_MPC_SV8;
|
|
} else {
|
|
/* No sv8 stream header found */
|
|
return false;
|
|
}
|
|
} else {
|
|
return false; /* SV4-6 is not supported anymore */
|
|
}
|
|
|
|
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;
|
|
|
|
read_ape_tags(fd, id3);
|
|
return true;
|
|
}
|