LCOV - code coverage report
Current view: top level - libavcodec - mp3_header_decompress_bsf.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 57 0.0 %
Date: 2017-12-17 04:34:43 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /*
       2             :  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : #include "libavutil/common.h"
      22             : #include "libavutil/intreadwrite.h"
      23             : #include "avcodec.h"
      24             : #include "bsf.h"
      25             : #include "mpegaudiodecheader.h"
      26             : #include "mpegaudiodata.h"
      27             : 
      28             : 
      29           0 : static int mp3_header_decompress(AVBSFContext *ctx, AVPacket *out)
      30             : {
      31             :     AVPacket *in;
      32             :     uint32_t header;
      33           0 :     int sample_rate= ctx->par_in->sample_rate;
      34           0 :     int sample_rate_index=0;
      35             :     int lsf, mpeg25, bitrate_index, frame_size, ret;
      36             :     uint8_t *buf;
      37             :     int buf_size;
      38             : 
      39           0 :     ret = ff_bsf_get_packet(ctx, &in);
      40           0 :     if (ret < 0)
      41           0 :         return ret;
      42             : 
      43           0 :     buf      = in->data;
      44           0 :     buf_size = in->size;
      45             : 
      46           0 :     header = AV_RB32(buf);
      47           0 :     if(ff_mpa_check_header(header) >= 0){
      48           0 :         av_packet_move_ref(out, in);
      49           0 :         av_packet_free(&in);
      50             : 
      51           0 :         return 0;
      52             :     }
      53             : 
      54           0 :     if(ctx->par_in->extradata_size != 15 || strcmp(ctx->par_in->extradata, "FFCMP3 0.0")){
      55           0 :         av_log(ctx, AV_LOG_ERROR, "Extradata invalid %d\n", ctx->par_in->extradata_size);
      56           0 :         ret = AVERROR(EINVAL);
      57           0 :         goto fail;
      58             :     }
      59             : 
      60           0 :     header= AV_RB32(ctx->par_in->extradata+11) & MP3_MASK;
      61             : 
      62           0 :     lsf     = sample_rate < (24000+32000)/2;
      63           0 :     mpeg25  = sample_rate < (12000+16000)/2;
      64           0 :     sample_rate_index= (header>>10)&3;
      65           0 :     sample_rate= avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); //in case sample rate is a little off
      66             : 
      67           0 :     for(bitrate_index=2; bitrate_index<30; bitrate_index++){
      68           0 :         frame_size = avpriv_mpa_bitrate_tab[lsf][2][bitrate_index>>1];
      69           0 :         frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
      70           0 :         if(frame_size == buf_size + 4)
      71           0 :             break;
      72           0 :         if(frame_size == buf_size + 6)
      73           0 :             break;
      74             :     }
      75           0 :     if(bitrate_index == 30){
      76           0 :         av_log(ctx, AV_LOG_ERROR, "Could not find bitrate_index.\n");
      77           0 :         ret = AVERROR(EINVAL);
      78           0 :         goto fail;
      79             :     }
      80             : 
      81           0 :     header |= (bitrate_index&1)<<9;
      82           0 :     header |= (bitrate_index>>1)<<12;
      83           0 :     header |= (frame_size == buf_size + 4)<<16; //FIXME actually set a correct crc instead of 0
      84             : 
      85           0 :     ret = av_new_packet(out, frame_size);
      86           0 :     if (ret < 0)
      87           0 :         goto fail;
      88           0 :     ret = av_packet_copy_props(out, in);
      89           0 :     if (ret < 0) {
      90           0 :         av_packet_free(&out);
      91           0 :         goto fail;
      92             :     }
      93           0 :     memcpy(out->data + frame_size - buf_size, buf, buf_size + AV_INPUT_BUFFER_PADDING_SIZE);
      94             : 
      95           0 :     if(ctx->par_in->channels==2){
      96           0 :         uint8_t *p= out->data + frame_size - buf_size;
      97           0 :         if(lsf){
      98           0 :             FFSWAP(int, p[1], p[2]);
      99           0 :             header |= (p[1] & 0xC0)>>2;
     100           0 :             p[1] &= 0x3F;
     101             :         }else{
     102           0 :             header |= p[1] & 0x30;
     103           0 :             p[1] &= 0xCF;
     104             :         }
     105             :     }
     106             : 
     107           0 :     AV_WB32(out->data, header);
     108             : 
     109           0 :     ret = 0;
     110             : 
     111           0 : fail:
     112           0 :     av_packet_free(&in);
     113           0 :     return ret;
     114             : }
     115             : 
     116             : static const enum AVCodecID codec_ids[] = {
     117             :     AV_CODEC_ID_MP3, AV_CODEC_ID_NONE,
     118             : };
     119             : 
     120             : const AVBitStreamFilter ff_mp3_header_decompress_bsf = {
     121             :     .name      = "mp3decomp",
     122             :     .filter    = mp3_header_decompress,
     123             :     .codec_ids = codec_ids,
     124             : };

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