diff options
Diffstat (limited to 'libmpdemux/mp3_hdr.c')
| -rw-r--r-- | libmpdemux/mp3_hdr.c | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/libmpdemux/mp3_hdr.c b/libmpdemux/mp3_hdr.c deleted file mode 100644 index ac2d0876e1..0000000000 --- a/libmpdemux/mp3_hdr.c +++ /dev/null @@ -1,122 +0,0 @@ -/* - * This file is part of MPlayer. - * - * MPlayer 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. - * - * MPlayer is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with MPlayer; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#include <stdio.h> -#include <stdint.h> - -#include "config.h" -#include "mp3_hdr.h" -#include "mp_msg.h" - -//----------------------- mp3 audio frame header parser ----------------------- - -static const uint16_t tabsel_123[2][3][16] = { - { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,0}, - {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,0}, - {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,0} }, - - { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,0}, - {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0}, - {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0} } -}; - -static const int freqs[9] = { 44100, 48000, 32000, // MPEG 1.0 - 22050, 24000, 16000, // MPEG 2.0 - 11025, 12000, 8000}; // MPEG 2.5 - -/* - * return frame size or -1 (bad frame) - */ -int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* srate, int* spf, int* mpa_layer, int* br){ - int stereo,lsf,framesize,padding,bitrate_index,sampling_frequency, divisor; - int bitrate; - int layer; - static const int mult[3] = { 12000, 144000, 144000 }; - uint32_t newhead = - hbuf[0] << 24 | - hbuf[1] << 16 | - hbuf[2] << 8 | - hbuf[3]; - - // head_check: - if( (newhead & 0xffe00000) != 0xffe00000 ){ - mp_msg(MSGT_DEMUXER,MSGL_DBG2,"head_check failed\n"); - return -1; - } - - layer = 4-((newhead>>17)&3); - if(layer==4){ - mp_msg(MSGT_DEMUXER,MSGL_DBG2,"not layer-1/2/3\n"); - return -1; - } - - sampling_frequency = (newhead>>10)&0x3; // valid: 0..2 - if(sampling_frequency==3){ - mp_msg(MSGT_DEMUXER,MSGL_DBG2,"invalid sampling_frequency\n"); - return -1; - } - - if( newhead & (1<<20) ) { - // MPEG 1.0 (lsf==0) or MPEG 2.0 (lsf==1) - lsf = !(newhead & (1<<19)); - sampling_frequency += lsf*3; - } else { - // MPEG 2.5 - lsf = 1; - sampling_frequency += 6; - } - - bitrate_index = (newhead>>12)&0xf; // valid: 1..14 - padding = (newhead>>9)&0x1; - - stereo = ( ((newhead>>6)&0x3) == 3) ? 1 : 2; - - bitrate = tabsel_123[lsf][layer-1][bitrate_index]; - framesize = bitrate * mult[layer-1]; - - mp_msg(MSGT_DEMUXER,MSGL_DBG2,"FRAMESIZE: %d, layer: %d, bitrate: %d, mult: %d\n", - framesize, layer, tabsel_123[lsf][layer-1][bitrate_index], mult[layer-1]); - if(!framesize){ - mp_msg(MSGT_DEMUXER,MSGL_DBG2,"invalid framesize/bitrate_index\n"); - return -1; - } - - divisor = layer == 3 ? (freqs[sampling_frequency] << lsf) : freqs[sampling_frequency]; - framesize /= divisor; - framesize += padding; - if(layer==1) - framesize *= 4; - - if(srate) - *srate = freqs[sampling_frequency]; - if(spf) { - if(layer == 1) - *spf = 384; - else if(layer == 2) - *spf = 1152; - else if(sampling_frequency > 2) // not 1.0 - *spf = 576; - else - *spf = 1152; - } - if(mpa_layer) *mpa_layer = layer; - if(chans) *chans = stereo; - if(br) *br = bitrate; - - return framesize; -} |