| /*************************************************************************** |
| * __________ __ ___. |
| * 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 <inttypes.h> |
| #include "system.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. */ |
| used += parse_replaygain_int(album, gain * 512 / 100, peak << 9, |
| id3, id3->toc + used, sizeof(id3->toc) - used); |
| } |
| |
| 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. */ |
| used += parse_replaygain_int(album, gain * 512 / 100, peak, |
| id3, id3->toc + used, sizeof(id3->toc) - used); |
| } |
| |
| 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); |
| } 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); |
| } |
| } |
| } 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; |
| return true; |
| } |