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3a57f2f721
Most of the churn here occurs because 'filesize' is one of the redefined filesystem functions, but some of the structs used by the native FS code also include a 'filesize' member variable which gets renamed by the macro in some but not all source files. It's easier to rename 'filesize()' to 'ffilesize()' rather than try to clean up the macro mess or renaming the struct members. There is weirdness with root_realpath() which now breaks on native builds because it was assumed to be unprefixed there. dir_get_info() was unprefixed everywhere but this just seems inconsistent; make it follow the FS_PREFIX() convention too. Change-Id: Ic3700c6234ea45f32679c1a8429d70fdb8f4088a
219 lines
7.9 KiB
C
219 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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*
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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 "platform.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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parse_replaygain_int(album, gain * 512 / 100, peak << 9, id3);
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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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parse_replaygain_int(album, gain * 512 / 100, peak, id3);
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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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id3->codectype = AFMT_MPC_SV7;
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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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//uint8_t 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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id3->codectype = AFMT_MPC_SV8;
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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 = ffilesize(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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