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64 lines
2.6 KiB
C
64 lines
2.6 KiB
C
//=========================================================================
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// FILENAME : tagutils-mp3.h
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// DESCRIPTION : MP3 metadata reader
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//=========================================================================
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// Copyright (c) 2008- NETGEAR, Inc. All Rights Reserved.
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//=========================================================================
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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struct mp3_frameinfo {
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int layer; // 1,2,3
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int bitrate; // unit=kbps
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int samplerate; // samp/sec
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int stereo; // flag
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int frame_length; // bytes
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int crc_protected; // flag
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int samples_per_frame; // calculated
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int padding; // flag
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int xing_offset; // for xing hdr
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int number_of_frames;
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int frame_offset;
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short mpeg_version;
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short id3_version;
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int is_valid;
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};
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static int _get_mp3tags(char *file, struct song_metadata *psong);
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static int _get_mp3fileinfo(char *file, struct song_metadata *psong);
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static int _decode_mp3_frame(unsigned char *frame, struct mp3_frameinfo *pfi);
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// bitrate_tbl[layer_index][bitrate_index]
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static int bitrate_tbl[5][16] = {
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{ 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0 }, /* MPEG1, L1 */
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0 }, /* MPEG1, L2 */
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{ 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0 }, /* MPEG1, L3 */
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{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0 }, /* MPEG2/2.5, L1 */
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 } /* MPEG2/2.5, L2/L3 */
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};
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// sample_rate[sample_index][samplerate_index]
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static int sample_rate_tbl[3][4] = {
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{ 44100, 48000, 32000, 0 }, /* MPEG 1 */
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{ 22050, 24000, 16000, 0 }, /* MPEG 2 */
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{ 11025, 12000, 8000, 0 } /* MPEG 2.5 */
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};
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