f8979dae58
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@3495 a1c6a512-1295-4272-9138-f99709370657
698 lines
19 KiB
C
698 lines
19 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) 2002 by Daniel Stenberg
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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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/*
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* Parts of this code has been stolen from the Ample project and was written
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* by David Härdeman. It has since been extended and enhanced pretty much by
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* all sorts of friendly Rockbox people.
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*
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* A nice reference for MPEG header info:
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* http://rockbox.haxx.se/docs/mpeghdr.html
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include "debug.h"
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#include "mp3data.h"
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#include "file.h"
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#define DEBUG_VERBOSE
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#define BYTES2INT(b1,b2,b3,b4) (((b1 & 0xFF) << (3*8)) | \
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((b2 & 0xFF) << (2*8)) | \
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((b3 & 0xFF) << (1*8)) | \
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((b4 & 0xFF) << (0*8)))
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#define SYNC_MASK (0x7ff << 21)
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#define VERSION_MASK (3 << 19)
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#define LAYER_MASK (3 << 17)
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#define PROTECTION_MASK (1 << 16)
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#define BITRATE_MASK (0xf << 12)
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#define SAMPLERATE_MASK (3 << 10)
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#define PADDING_MASK (1 << 9)
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#define PRIVATE_MASK (1 << 8)
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#define CHANNELMODE_MASK (3 << 6)
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#define MODE_EXT_MASK (3 << 4)
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#define COPYRIGHT_MASK (1 << 3)
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#define ORIGINAL_MASK (1 << 2)
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#define EMPHASIS_MASK 3
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/* Table of bitrates for MP3 files, all values in kilo.
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* Indexed by version, layer and value of bit 15-12 in header.
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*/
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const int bitrate_table[2][3][16] =
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{
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{
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{0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,0},
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{0,32,48,56, 64,80, 96, 112,128,160,192,224,256,320,384,0},
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{0,32,40,48, 56,64, 80, 96, 112,128,160,192,224,256,320,0}
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},
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{
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{0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,0},
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{0, 8,16,24,32,40,48, 56, 64, 80, 96,112,128,144,160,0},
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{0, 8,16,24,32,40,48, 56, 64, 80, 96,112,128,144,160,0}
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}
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};
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/* Table of samples per frame for MP3 files.
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* Indexed by layer. Multiplied with 1000.
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*/
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const int bs[3] = {384000, 1152000, 1152000};
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/* Table of sample frequency for MP3 files.
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* Indexed by version and layer.
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*/
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const int freqtab[][4] =
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{
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{11025, 12000, 8000, 0}, /* MPEG version 2.5 */
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{44100, 48000, 32000, 0}, /* MPEG Version 1 */
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{22050, 24000, 16000, 0}, /* MPEG version 2 */
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};
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/* check if 'head' is a valid mp3 frame header */
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static bool is_mp3frameheader(unsigned long head)
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{
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if ((head & SYNC_MASK) != (unsigned long)SYNC_MASK) /* bad sync? */
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return false;
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if ((head & VERSION_MASK) == (1 << 19)) /* bad version? */
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return false;
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if (!(head & LAYER_MASK)) /* no layer? */
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return false;
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if ((head & BITRATE_MASK) == BITRATE_MASK) /* bad bitrate? */
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return false;
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if (!(head & BITRATE_MASK)) /* no bitrate? */
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return false;
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if ((head & SAMPLERATE_MASK) == SAMPLERATE_MASK) /* bad sample rate? */
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return false;
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if (((head >> 19) & 1) == 1 &&
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((head >> 17) & 3) == 3 &&
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((head >> 16) & 1) == 1)
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return false;
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if ((head & 0xffff0000) == 0xfffe0000)
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return false;
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return true;
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}
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static bool mp3headerinfo(struct mp3info *info, unsigned long header)
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{
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int bittable = 0;
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int bitindex;
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int freqindex;
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/* MPEG Audio Version */
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switch(header & VERSION_MASK) {
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case 0:
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/* MPEG version 2.5 is not an official standard */
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info->version = MPEG_VERSION2_5;
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bittable = MPEG_VERSION2 - 1; /* use the V2 bit rate table */
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break;
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case (1 << 19):
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return false;
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case (2 << 19):
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/* MPEG version 2 (ISO/IEC 13818-3) */
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info->version = MPEG_VERSION2;
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bittable = MPEG_VERSION2 - 1;
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break;
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case (3 << 19):
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/* MPEG version 1 (ISO/IEC 11172-3) */
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info->version = MPEG_VERSION1;
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bittable = MPEG_VERSION1 - 1;
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break;
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}
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switch(header & LAYER_MASK) {
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case 0:
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return false;
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case (1 << 17):
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info->layer = 2;
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break;
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case (2 << 17):
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info->layer = 1;
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break;
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case (3 << 17):
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info->layer = 0;
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break;
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}
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info->protection = (header & PROTECTION_MASK)?true:false;
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/* Bitrate */
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bitindex = (header & 0xf000) >> 12;
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info->bitrate = bitrate_table[bittable][info->layer][bitindex];
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if(info->bitrate == 0)
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return false;
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/* Sampling frequency */
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freqindex = (header & 0x0C00) >> 10;
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info->frequency = freqtab[info->version][freqindex];
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if(info->frequency == 0)
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return false;
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info->padding = (header & 0x0200)?1:0;
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/* Calculate number of bytes, calculation depends on layer */
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switch(info->layer) {
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case 0:
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info->frame_size = info->bitrate * 48000;
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info->frame_size /=
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freqtab[info->version][freqindex] << bittable;
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break;
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case 1:
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case 2:
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info->frame_size = info->bitrate * 144000;
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info->frame_size /=
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freqtab[info->version][freqindex] << bittable;
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break;
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default:
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info->frame_size = 1;
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}
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info->frame_size += info->padding;
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/* Calculate time per frame */
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info->frame_time = bs[info->layer] /
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(freqtab[info->version][freqindex] << bittable);
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info->channel_mode = (header & 0xc0) >> 6;
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info->mode_extension = (header & 0x30) >> 4;
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info->emphasis = header & 3;
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#ifdef DEBUG_VERBOSE
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DEBUGF( "Header: %08x, Ver %d, lay %d, bitr %d, freq %d, "
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"chmode %d, mode_ext %d, emph %d, bytes: %d time: %d\n",
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header, info->version, info->layer, info->bitrate, info->frequency,
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info->channel_mode, info->mode_extension,
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info->emphasis, info->frame_size, info->frame_time);
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#endif
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return true;
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}
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unsigned long find_next_frame(int fd, int *offset, int max_offset, unsigned long last_header)
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{
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unsigned long header=0;
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unsigned char tmp;
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int i;
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int pos = 0;
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/* We remember the last header we found, to use as a template to see if
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the header we find has the same frequency, layer etc */
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last_header &= 0xffff0c00;
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/* Fill up header with first 24 bits */
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for(i = 0; i < 3; i++) {
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header <<= 8;
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if(!read(fd, &tmp, 1))
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return 0;
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header |= tmp;
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pos++;
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}
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do {
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header <<= 8;
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if(!read(fd, &tmp, 1))
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return 0;
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header |= tmp;
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pos++;
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if(max_offset > 0 && pos > max_offset)
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return 0;
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} while(!is_mp3frameheader(header) ||
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(last_header?((header & 0xffff0c00) != last_header):false));
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*offset = pos - 4;
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#ifdef DEBUG
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if(*offset)
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DEBUGF("Warning: skipping %d bytes of garbage\n", *offset);
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#endif
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return header;
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}
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#ifdef SIMULATOR
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unsigned char mp3buf[0x100000];
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unsigned char mp3end[1];
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#else
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extern unsigned char mp3buf[];
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extern unsigned char mp3end[];
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#endif
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static int fnf_read_index;
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static int fnf_buf_len;
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static int buf_getbyte(int fd, unsigned char *c)
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{
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if(fnf_read_index < fnf_buf_len)
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{
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*c = mp3buf[fnf_read_index++];
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return 1;
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}
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else
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{
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fnf_buf_len = read(fd, mp3buf, mp3end - mp3buf);
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if(fnf_buf_len < 0)
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return -1;
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fnf_read_index = 0;
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if(fnf_buf_len > 0)
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{
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*c = mp3buf[fnf_read_index++];
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return 1;
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}
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else
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return 0;
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}
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return 0;
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}
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static int buf_seek(int fd, int len)
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{
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fnf_read_index += len;
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if(fnf_read_index > fnf_buf_len)
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{
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len = fnf_read_index - fnf_buf_len;
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fnf_buf_len = read(fd, mp3buf, mp3end - mp3buf);
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if(fnf_buf_len < 0)
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return -1;
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fnf_read_index = 0;
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fnf_read_index += len;
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}
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if(fnf_read_index > fnf_buf_len)
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{
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return -1;
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}
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else
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return 0;
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}
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static void buf_init(void)
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{
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fnf_buf_len = 0;
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fnf_read_index = 0;
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}
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unsigned long buf_find_next_frame(int fd, int *offset, int max_offset,
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unsigned long last_header)
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{
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unsigned long header=0;
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unsigned char tmp;
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int i;
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int pos = 0;
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/* We remember the last header we found, to use as a template to see if
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the header we find has the same frequency, layer etc */
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last_header &= 0xffff0c00;
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/* Fill up header with first 24 bits */
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for(i = 0; i < 3; i++) {
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header <<= 8;
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if(!buf_getbyte(fd, &tmp))
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return 0;
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header |= tmp;
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pos++;
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}
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do {
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header <<= 8;
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if(!buf_getbyte(fd, &tmp))
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return 0;
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header |= tmp;
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pos++;
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if(max_offset > 0 && pos > max_offset)
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return 0;
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} while(!is_mp3frameheader(header) ||
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(last_header?((header & 0xffff0c00) != last_header):false));
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*offset = pos - 4;
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#ifdef DEBUG
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if(*offset)
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DEBUGF("Warning: skipping %d bytes of garbage\n", *offset);
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#endif
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return header;
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}
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int get_mp3file_info(int fd, struct mp3info *info)
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{
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unsigned char frame[1050];
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unsigned char *vbrheader;
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unsigned long header;
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int bytecount;
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int num_offsets;
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int frames_per_entry;
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int i;
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int offset;
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int j;
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int tmp;
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header = find_next_frame(fd, &bytecount, 0x20000, 0);
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/* Quit if we haven't found a valid header within 128K */
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if(header == 0)
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return -1;
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memset(info, 0, sizeof(struct mp3info));
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if(!mp3headerinfo(info, header))
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return -2;
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/* OK, we have found a frame. Let's see if it has a Xing header */
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if(read(fd, frame, info->frame_size-4) < 0)
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return -3;
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/* calculate position of VBR header */
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if ( info->version == MPEG_VERSION1 ) {
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if (info->channel_mode == 3) /* mono */
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vbrheader = frame + 17;
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else
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vbrheader = frame + 32;
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}
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else {
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if (info->channel_mode == 3) /* mono */
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vbrheader = frame + 9;
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else
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vbrheader = frame + 17;
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}
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if (vbrheader[0] == 'X' &&
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vbrheader[1] == 'i' &&
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vbrheader[2] == 'n' &&
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vbrheader[3] == 'g')
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{
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int i = 8; /* Where to start parsing info */
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DEBUGF("Xing header\n");
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/* Remember where in the file the Xing header is */
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info->vbr_header_pos = lseek(fd, 0, SEEK_CUR) - info->frame_size;
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/* We want to skip the Xing frame when playing the stream */
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bytecount += info->frame_size;
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/* Now get the next frame to find out the real info about
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the mp3 stream */
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header = find_next_frame(fd, &tmp, 0x20000, 0);
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if(header == 0)
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return -4;
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if(!mp3headerinfo(info, header))
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return -5;
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/* Yes, it is a VBR file */
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info->is_vbr = true;
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info->is_xing_vbr = true;
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if(vbrheader[7] & VBR_FRAMES_FLAG) /* Is the frame count there? */
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{
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info->frame_count = BYTES2INT(vbrheader[i], vbrheader[i+1],
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vbrheader[i+2], vbrheader[i+3]);
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info->file_time = info->frame_count * info->frame_time;
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i += 4;
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}
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if(vbrheader[7] & VBR_BYTES_FLAG) /* Is byte count there? */
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{
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info->byte_count = BYTES2INT(vbrheader[i], vbrheader[i+1],
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vbrheader[i+2], vbrheader[i+3]);
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i += 4;
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}
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if(info->file_time && info->byte_count)
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info->bitrate = info->byte_count * 8 / info->file_time;
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else
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info->bitrate = 0;
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if(vbrheader[7] & VBR_TOC_FLAG) /* Is table-of-contents there? */
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{
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memcpy( info->toc, vbrheader+i, 100 );
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}
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}
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if (vbrheader[0] == 'V' &&
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vbrheader[1] == 'B' &&
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vbrheader[2] == 'R' &&
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vbrheader[3] == 'I')
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{
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DEBUGF("VBRI header\n");
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/* We want to skip the VBRI frame when playing the stream */
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bytecount += info->frame_size;
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/* Now get the next frame to find out the real info about
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the mp3 stream */
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header = find_next_frame(fd, &bytecount, 0x20000, 0);
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if(header == 0)
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return -6;
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if(!mp3headerinfo(info, header))
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return -7;
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DEBUGF("%04x: %04x %04x ", 0, header >> 16, header & 0xffff);
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for(i = 4;i < (int)sizeof(frame)-4;i+=2) {
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if(i % 16 == 0) {
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DEBUGF("\n%04x: ", i-4);
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}
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DEBUGF("%04x ", (frame[i-4] << 8) | frame[i-4+1]);
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}
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DEBUGF("\n");
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/* Yes, it is a FhG VBR file */
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info->is_vbr = true;
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info->is_vbri_vbr = true;
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info->has_toc = false; /* We don't parse the TOC (yet) */
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info->byte_count = BYTES2INT(vbrheader[10], vbrheader[11],
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vbrheader[12], vbrheader[13]);
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info->frame_count = BYTES2INT(vbrheader[14], vbrheader[15],
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vbrheader[16], vbrheader[17]);
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info->file_time = info->frame_count * info->frame_time;
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info->bitrate = info->byte_count * 8 / info->file_time;
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/* We don't parse the TOC, since we don't yet know how to (FIXME) */
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num_offsets = BYTES2INT(0, 0, vbrheader[18], vbrheader[19]);
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frames_per_entry = BYTES2INT(0, 0, vbrheader[24], vbrheader[25]);
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DEBUGF("Frame size (%dkpbs): %d bytes (0x%x)\n",
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info->bitrate, info->frame_size, info->frame_size);
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DEBUGF("Frame count: %x\n", info->frame_count);
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DEBUGF("Byte count: %x\n", info->byte_count);
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DEBUGF("Offsets: %d\n", num_offsets);
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DEBUGF("Frames/entry: %d\n", frames_per_entry);
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offset = 0;
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for(i = 0;i < num_offsets;i++)
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{
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j = BYTES2INT(0, 0, vbrheader[26+i*2], vbrheader[27+i*2]);
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offset += j;
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DEBUGF("%03d: %x (%x)\n", i, offset - bytecount, j);
|
|
}
|
|
}
|
|
|
|
/* Is it a LAME Info frame? */
|
|
if (vbrheader[0] == 'I' &&
|
|
vbrheader[1] == 'n' &&
|
|
vbrheader[2] == 'f' &&
|
|
vbrheader[3] == 'o')
|
|
{
|
|
/* Make sure we skip this frame in playback */
|
|
bytecount += info->frame_size;
|
|
}
|
|
|
|
return bytecount;
|
|
}
|
|
|
|
/* This is an MP3 header, 128kbit/s, 44.1kHz, with silence */
|
|
static const unsigned char xing_frame_header[] = {
|
|
0xff, 0xfa, 0x90, 0x64, 0x86, 0x1f
|
|
};
|
|
|
|
static const char cooltext[] = "Rockbox rocks";
|
|
|
|
static void int2bytes(unsigned char *buf, int val)
|
|
{
|
|
buf[0] = (val >> 24) & 0xff;
|
|
buf[1] = (val >> 16) & 0xff;
|
|
buf[2] = (val >> 8) & 0xff;
|
|
buf[3] = val & 0xff;
|
|
}
|
|
|
|
int count_mp3_frames(int fd, int startpos, int filesize,
|
|
void (*progressfunc)(int))
|
|
{
|
|
unsigned long header = 0;
|
|
struct mp3info info;
|
|
int num_frames;
|
|
int bytes;
|
|
int cnt;
|
|
int progress_chunk = filesize / 50; /* Max is 50%, in 1% increments */
|
|
int progress_cnt = 0;
|
|
bool is_vbr = false;
|
|
int last_bitrate = 0;
|
|
|
|
if(lseek(fd, startpos, SEEK_SET) < 0)
|
|
return -1;
|
|
|
|
buf_init();
|
|
|
|
/* Find out the total number of frames */
|
|
num_frames = 0;
|
|
cnt = 0;
|
|
|
|
while((header = buf_find_next_frame(fd, &bytes, -1, header))) {
|
|
mp3headerinfo(&info, header);
|
|
|
|
/* See if this really is a VBR file */
|
|
if(last_bitrate && info.bitrate != last_bitrate)
|
|
{
|
|
is_vbr = true;
|
|
}
|
|
last_bitrate = info.bitrate;
|
|
|
|
buf_seek(fd, info.frame_size-4);
|
|
num_frames++;
|
|
if(progressfunc)
|
|
{
|
|
cnt += bytes + info.frame_size;
|
|
if(cnt > progress_chunk)
|
|
{
|
|
progress_cnt++;
|
|
progressfunc(progress_cnt);
|
|
cnt = 0;
|
|
}
|
|
}
|
|
}
|
|
DEBUGF("Total number of frames: %d\n", num_frames);
|
|
|
|
if(is_vbr)
|
|
return num_frames;
|
|
else
|
|
{
|
|
DEBUGF("Not a VBR file\n");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int create_xing_header(int fd, int startpos, int filesize,
|
|
unsigned char *buf, int num_frames,
|
|
void (*progressfunc)(int), bool generate_toc)
|
|
{
|
|
unsigned long header = 0;
|
|
struct mp3info info;
|
|
int pos, last_pos;
|
|
int i, j;
|
|
int bytes;
|
|
int filepos;
|
|
int tocentry;
|
|
int x;
|
|
int index;
|
|
|
|
DEBUGF("create_xing_header()\n");
|
|
|
|
/* Create the frame header */
|
|
memset(buf, 0, 417);
|
|
memcpy(buf, xing_frame_header, 6);
|
|
|
|
lseek(fd, startpos, SEEK_SET);
|
|
buf_init();
|
|
|
|
buf[36] = 'X';
|
|
buf[36+1] = 'i';
|
|
buf[36+2] = 'n';
|
|
buf[36+3] = 'g';
|
|
int2bytes(&buf[36+4], ((num_frames?VBR_FRAMES_FLAG:0) |
|
|
(filesize?VBR_BYTES_FLAG:0) |
|
|
(generate_toc?VBR_TOC_FLAG:0)));
|
|
index = 36+8;
|
|
if(num_frames)
|
|
{
|
|
int2bytes(&buf[index], num_frames);
|
|
index += 4;
|
|
}
|
|
|
|
if(filesize)
|
|
{
|
|
int2bytes(&buf[index], filesize - startpos);
|
|
index += 4;
|
|
}
|
|
|
|
if(generate_toc)
|
|
{
|
|
/* Generate filepos table */
|
|
last_pos = 0;
|
|
filepos = 0;
|
|
header = 0;
|
|
x = 0;
|
|
for(i = 0;i < 100;i++) {
|
|
/* Calculate the absolute frame number for this seek point */
|
|
pos = i * num_frames / 100;
|
|
|
|
/* Advance from the last seek point to this one */
|
|
for(j = 0;j < pos - last_pos;j++)
|
|
{
|
|
DEBUGF("fpos: %x frame no: %x ", filepos, x++);
|
|
header = buf_find_next_frame(fd, &bytes, -1, header);
|
|
mp3headerinfo(&info, header);
|
|
buf_seek(fd, info.frame_size-4);
|
|
filepos += info.frame_size;
|
|
}
|
|
|
|
if(progressfunc)
|
|
{
|
|
progressfunc(50 + i/2);
|
|
}
|
|
|
|
tocentry = filepos * 256 / filesize;
|
|
|
|
DEBUGF("Pos %d: %d relpos: %d filepos: %x tocentry: %x\n",
|
|
i, pos, pos-last_pos, filepos, tocentry);
|
|
|
|
/* Fill in the TOC entry */
|
|
buf[index + i] = tocentry;
|
|
|
|
last_pos = pos;
|
|
}
|
|
}
|
|
|
|
memcpy(buf + index + 100, cooltext, sizeof(cooltext));
|
|
|
|
#ifdef DEBUG
|
|
for(i = 0;i < 417;i++)
|
|
{
|
|
if(i && !(i % 16))
|
|
DEBUGF("\n");
|
|
|
|
DEBUGF("%02x ", buf[i]);
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|