LCOV - code coverage report
Current view: top level - src/libavformat - adp.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 37 40 92.5 %
Date: 2017-09-22 00:04:37 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * ADP demuxer
       3             :  * Copyright (c) 2013 James Almer
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "libavutil/channel_layout.h"
      23             : #include "libavutil/intreadwrite.h"
      24             : #include "avformat.h"
      25             : #include "internal.h"
      26             : 
      27        6034 : static int adp_probe(AVProbeData *p)
      28             : {
      29        6034 :     int i, changes = 0;
      30        6034 :     char last = 0;
      31             : 
      32        6034 :     if (p->buf_size < 32)
      33           0 :         return 0;
      34             : 
      35      815093 :     for (i = 0; i < p->buf_size - 3; i+=32) {
      36      814480 :         if (p->buf[i] != p->buf[i+2] || p->buf[i+1] != p->buf[i+3])
      37        5421 :             return 0;
      38      809059 :         if (p->buf[i] != last)
      39      804677 :             changes++;
      40      809059 :         last = p->buf[i];
      41             :     }
      42         613 :     if (changes <= 1)
      43           2 :         return 0;
      44             : 
      45         611 :     return p->buf_size < 260 ? 1 : AVPROBE_SCORE_MAX / 4;
      46             : }
      47             : 
      48           1 : static int adp_read_header(AVFormatContext *s)
      49             : {
      50             :     AVStream *st;
      51             : 
      52           1 :     st = avformat_new_stream(s, NULL);
      53           1 :     if (!st)
      54           0 :         return AVERROR(ENOMEM);
      55             : 
      56           1 :     st->codecpar->codec_type     = AVMEDIA_TYPE_AUDIO;
      57           1 :     st->codecpar->codec_id       = AV_CODEC_ID_ADPCM_DTK;
      58           1 :     st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
      59           1 :     st->codecpar->channels       = 2;
      60           1 :     st->codecpar->sample_rate    = 48000;
      61           1 :     st->start_time            = 0;
      62           1 :     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
      63           1 :         st->duration          = av_get_audio_frame_duration2(st->codecpar, avio_size(s->pb));
      64             : 
      65           1 :     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
      66             : 
      67           1 :     return 0;
      68             : }
      69             : 
      70          34 : static int adp_read_packet(AVFormatContext *s, AVPacket *pkt)
      71             : {
      72          34 :     int ret, size = 1024;
      73             : 
      74          34 :     if (avio_feof(s->pb))
      75           1 :         return AVERROR_EOF;
      76             : 
      77          33 :     ret = av_get_packet(s->pb, pkt, size);
      78             : 
      79          33 :     if (ret != size) {
      80           1 :         if (ret < 0) {
      81           1 :             av_packet_unref(pkt);
      82           1 :             return ret;
      83             :         }
      84           0 :         av_shrink_packet(pkt, ret);
      85             :     }
      86          32 :     pkt->stream_index = 0;
      87             : 
      88          32 :     return ret;
      89             : }
      90             : 
      91             : AVInputFormat ff_adp_demuxer = {
      92             :     .name           = "adp",
      93             :     .long_name      = NULL_IF_CONFIG_SMALL("ADP"),
      94             :     .read_probe     = adp_probe,
      95             :     .read_header    = adp_read_header,
      96             :     .read_packet    = adp_read_packet,
      97             :     .extensions     = "adp,dtk",
      98             : };

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