6a9a8197b3
Patch by Thomas Jarosch. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28892 a1c6a512-1295-4272-9138-f99709370657
218 lines
7.9 KiB
C
218 lines
7.9 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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* Copyright (C) 2010 Andree Buschmann
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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 <stdio.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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#include "fixedpoint.h"
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/* Needed for replay gain and clipping prevention of SV8 files. */
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#define SV8_TO_SV7_CONVERT_GAIN (6482) /* 64.82 * 100, MPC_OLD_GAIN_REF */
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#define SV8_TO_SV7_CONVERT_PEAK (23119) /* 256 * 20 * log10(32768) */
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static int set_replaygain_sv7(struct mp3entry* id3,
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bool album,
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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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/* Save the ReplayGain data to id3-structure for further processing. */
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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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static int set_replaygain_sv8(struct mp3entry* id3,
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bool album,
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long gain,
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long peak,
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long used)
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{
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gain = (long)(SV8_TO_SV7_CONVERT_GAIN - ((gain*100)/256));
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/* Transform SV8's logarithmic peak representation to the desired linear
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* representation: linear = pow(10, peak/256/20).
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*
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* FP_BITS = 24 bits = desired fp representation for dsp routines
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* FRAC_BITS = 12 bits = resolution used for fp_bits
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* fp_factor(peak*(1<<FRAC_BITS)/256, FRAC_BITS) << (FP_BITS-FRAC_BITS)
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**/
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peak = (fp_factor((peak-SV8_TO_SV7_CONVERT_PEAK)*16, 12) << 12);
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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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/* Save the ReplayGain data to id3-structure for further processing. */
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used += parse_replaygain_int(album, gain * 512 / 100, peak,
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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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static int sv8_get_size(uint8_t *buffer, int index, uint64_t *p_size)
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{
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unsigned char tmp;
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uint64_t size = 0;
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do {
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tmp = buffer[index++];
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size = (size << 7) | (tmp & 0x7F);
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} while((tmp & 0x80));
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*p_size = size;
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return index;
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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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static const int32_t sfreqs[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 == 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[(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_sv7(id3, false, header[3], bufused);
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bufused = set_replaygain_sv7(id3, true , header[4], bufused);
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} else {
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return false; /* only SV7 is allowed within a "MP+" signature */
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}
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} else if (!memcmp(header, "MPCK", 4)) { /* Compare to sig "MPCK" */
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uint8_t sv8_header[32];
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/* 4 bytes 'MPCK' */
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lseek(fd, 4, SEEK_SET);
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if (read(fd, sv8_header, 2) != 2) return false; /* read frame ID */
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if (!memcmp(sv8_header, "SH", 2)) { /* Stream Header ID */
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int32_t k = 0;
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uint32_t streamversion;
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uint64_t size = 0; /* tag size */
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uint64_t dummy = 0; /* used to dummy read data from header */
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/* 4 bytes 'MPCK' + 2 'SH' */
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lseek(fd, 6, SEEK_SET);
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if (read(fd, sv8_header, 32) != 32) return false;
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/* Read the size of 'SH'-tag */
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k = sv8_get_size(sv8_header, k, &size);
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/* Skip crc32 */
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k += 4;
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/* Read stream version */
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streamversion = sv8_header[k++];
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if (streamversion != 8) return false; /* Only SV8 is allowed. */
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/* Number of samples */
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k = sv8_get_size(sv8_header, k, &samples);
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/* Number of leading zero-samples */
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k = sv8_get_size(sv8_header, k, &dummy);
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/* Sampling frequency */
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id3->frequency = sfreqs[(sv8_header[k++] >> 5) & 0x0003];
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/* Number of channels */
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id3->channels = (sv8_header[k++] >> 4) + 1;
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/* Skip to next tag: k = size -2 */
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k = size - 2;
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if (!memcmp(sv8_header+k, "RG", 2)) { /* Replay Gain ID */
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long peak, gain;
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int bufused = 0;
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k += 2; /* 2 bytes 'RG' */
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/* sv8_get_size must be called to skip the right amount of
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* bits within the header data. */
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k = sv8_get_size(sv8_header, k, &size);
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/* Read and set replay gain */
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if (sv8_header[k++] == 1) {
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/* Title's peak and gain */
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gain = (int16_t) ((sv8_header[k]<<8) + sv8_header[k+1]); k += 2;
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peak = (uint16_t)((sv8_header[k]<<8) + sv8_header[k+1]); k += 2;
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bufused += set_replaygain_sv8(id3, false, gain, peak, bufused);
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/* Album's peak and gain */
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gain = (int16_t) ((sv8_header[k]<<8) + sv8_header[k+1]); k += 2;
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peak = (uint16_t)((sv8_header[k]<<8) + sv8_header[k+1]); k += 2;
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bufused += set_replaygain_sv8(id3, true , gain, peak, bufused);
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}
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}
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} else {
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/* No sv8 stream header found */
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return false;
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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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read_ape_tags(fd, id3);
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return true;
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}
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