2175d1edf6
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13637 a1c6a512-1295-4272-9138-f99709370657
118 lines
4.4 KiB
C
118 lines
4.4 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 Dave Chapman
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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 <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include "system.h"
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#include "id3.h"
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#include "metadata_common.h"
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#include "logf.h"
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#include "replaygain.h"
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bool get_musepack_metadata(int fd, struct mp3entry *id3)
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{
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const int32_t sfreqs_sv7[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 >= 8) {
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return false; /* SV8 or higher don't exist yet, so no support */
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} else 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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int track_gain, album_gain;
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unsigned int bufused;
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id3->frequency = sfreqs_sv7[(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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/* Extract ReplayGain data from header */
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track_gain = (int16_t)((header[3] >> 16) & 0xffff);
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id3->track_gain = get_replaygain_int(track_gain);
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id3->track_peak = ((uint16_t)(header[3] & 0xffff)) << 9;
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album_gain = (int16_t)((header[4] >> 16) & 0xffff);
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id3->album_gain = get_replaygain_int(album_gain);
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id3->album_peak = ((uint16_t)(header[4] & 0xffff)) << 9;
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/* Write replaygain values to strings for use in id3 screen. We use
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the XING header as buffer space since Musepack files shouldn't
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need to use it in any other way */
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id3->track_gain_string = (char *)id3->toc;
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bufused = snprintf(id3->track_gain_string, 45,
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"%d.%d dB", track_gain/100, abs(track_gain)%100);
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id3->album_gain_string = (char *)id3->toc + bufused + 1;
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bufused = snprintf(id3->album_gain_string, 45,
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"%d.%d dB", album_gain/100, abs(album_gain)%100);
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}
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} else {
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header[0] = letoh32(header[0]);
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unsigned int streamversion = (header[0] >> 11) & 0x03FF;
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if (streamversion != 4 && streamversion != 5 && streamversion != 6)
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return false;
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id3->frequency = 44100;
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id3->track_gain = 0;
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id3->track_peak = 0;
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id3->album_gain = 0;
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id3->album_peak = 0;
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if (streamversion >= 5)
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samples = (uint64_t)header[1]*1152; // 32 bit
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else
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samples = (uint64_t)(header[1] >> 16)*1152; // 16 bit
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samples -= 576;
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if (streamversion < 6)
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samples -= 1152;
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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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return true;
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}
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