241fd0fbdb
high-side as an interim fix. This plays fine (even gapless), but the progress bar is off and seeking is a little weird (but usable). git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16893 a1c6a512-1295-4272-9138-f99709370657
140 lines
4.4 KiB
C
140 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) 2007 David Bryant
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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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#define ID_UNIQUE 0x3f
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#define ID_LARGE 0x80
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#define ID_SAMPLE_RATE 0x27
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#define MONO_FLAG 4
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#define HYBRID_FLAG 8
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static const long wavpack_sample_rates [] =
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{
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6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
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32000, 44100, 48000, 64000, 88200, 96000, 192000
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};
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/* A simple parser to read basic information from a WavPack file. This
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* now works with self-extrating WavPack files and also will scan the
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* metadata for non-standard sampling rates. This no longer fails on
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* WavPack files containing floating-point audio data because these are
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* now converted to standard Rockbox format in the decoder.
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*/
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bool get_wavpack_metadata(int fd, struct mp3entry* id3)
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{
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/* Use the trackname part of the id3 structure as a temporary buffer */
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unsigned char* buf = (unsigned char *)id3->path;
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uint32_t totalsamples, blocksamples, flags;
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int i;
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for (i = 0; i < 256; ++i) {
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/* at every 256 bytes into file, try to read a WavPack header */
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if ((lseek(fd, i * 256, SEEK_SET) < 0) || (read(fd, buf, 32) < 32))
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return false;
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/* if valid WavPack 4 header version, break */
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if (memcmp (buf, "wvpk", 4) == 0 && buf [9] == 4 &&
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(buf [8] >= 2 && buf [8] <= 0x10))
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break;
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}
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if (i == 256) {
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logf ("Not a WavPack file");
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return false;
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}
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id3->vbr = true; /* All WavPack files are VBR */
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id3->filesize = filesize (fd);
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totalsamples = get_long_le(&buf[12]);
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blocksamples = get_long_le(&buf[20]);
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flags = get_long_le(&buf[24]);
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if (blocksamples) {
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int srindx = ((buf [26] >> 7) & 1) + ((buf [27] << 1) & 14);
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if (srindx == 15) {
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uint32_t meta_bytes = buf [4] + (buf [5] << 8) + (buf [6] << 16) - 24;
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uint32_t meta_size;
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id3->frequency = 44100;
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while (meta_bytes >= 6) {
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if (read(fd, buf, 2) < 2)
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break;
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if (buf [0] & ID_LARGE) {
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if (read(fd, buf + 2, 2) < 2)
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break;
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meta_size = (buf [1] << 1) + (buf [2] << 9) + (buf [3] << 17);
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meta_bytes -= meta_size + 4;
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}
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else {
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meta_size = buf [1] << 1;
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meta_bytes -= meta_size + 2;
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if ((buf [0] & ID_UNIQUE) == ID_SAMPLE_RATE) {
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if (meta_size == 4 && read(fd, buf + 2, 4) == 4)
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id3->frequency = buf [2] + (buf [3] << 8) + (buf [4] << 16);
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break;
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}
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}
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if (meta_size > 0 && lseek(fd, meta_size, SEEK_CUR) < 0)
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break;
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}
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}
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else
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id3->frequency = wavpack_sample_rates[srindx];
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/* if the total number of samples is unknown, make a guess on the high side (for now) */
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if (totalsamples == (uint32_t) -1) {
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totalsamples = filesize (fd) * 3;
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if (!(flags & HYBRID_FLAG))
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totalsamples /= 2;
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if (!(flags & MONO_FLAG))
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totalsamples /= 2;
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}
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id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
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id3->bitrate = filesize (fd) / (id3->length / 8);
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return true;
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}
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return false;
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}
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