LCOV - code coverage report
Current view: top level - src/libavformat - act.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 9 101 8.9 %
Date: 2017-01-24 04:42:20 Functions: 1 3 33.3 %

          Line data    Source code
       1             : /*
       2             :  * ACT file format demuxer
       3             :  * Copyright (c) 2007-2008 Vladimir Voroshilov
       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             : #include "avformat.h"
      22             : #include "riff.h"
      23             : #include "internal.h"
      24             : #include "libavcodec/get_bits.h"
      25             : 
      26             : #define CHUNK_SIZE 512
      27             : #define RIFF_TAG MKTAG('R','I','F','F')
      28             : #define WAVE_TAG MKTAG('W','A','V','E')
      29             : 
      30             : typedef struct{
      31             :     int bytes_left_in_chunk;
      32             :     uint8_t audio_buffer[22];///< temporary buffer for ACT frame
      33             :     char second_packet;      ///< 1 - if temporary buffer contains valid (second) G.729 packet
      34             : } ACTContext;
      35             : 
      36        5563 : static int probe(AVProbeData *p)
      37             : {
      38             :     int i;
      39             : 
      40        6377 :     if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
      41        1213 :         (AV_RL32(&p->buf[8]) != WAVE_TAG) ||
      42         399 :         (AV_RL32(&p->buf[16]) != 16))
      43        5551 :     return 0;
      44             : 
      45             :     //We can't be sure that this is ACT and not regular WAV
      46          12 :     if (p->buf_size<512)
      47           0 :         return 0;
      48             : 
      49          14 :     for(i=44; i<256; i++)
      50          14 :         if(p->buf[i])
      51          12 :             return 0;
      52             : 
      53           0 :     if(p->buf[256]!=0x84)
      54           0 :         return 0;
      55             : 
      56           0 :     for(i=264; i<512; i++)
      57           0 :         if(p->buf[i])
      58           0 :             return 0;
      59             : 
      60           0 :     return AVPROBE_SCORE_MAX;
      61             : }
      62             : 
      63           0 : static int read_header(AVFormatContext *s)
      64             : {
      65           0 :     ACTContext* ctx = s->priv_data;
      66           0 :     AVIOContext *pb = s->pb;
      67             :     int size;
      68             :     AVStream* st;
      69             : 
      70             :     int min,sec,msec;
      71             : 
      72           0 :     st = avformat_new_stream(s, NULL);
      73           0 :     if (!st)
      74           0 :         return AVERROR(ENOMEM);
      75             : 
      76           0 :     avio_skip(pb, 16);
      77           0 :     size=avio_rl32(pb);
      78           0 :     ff_get_wav_header(s, pb, st->codecpar, size, 0);
      79             : 
      80             :     /*
      81             :       8000Hz (Fine-rec) file format has 10 bytes long
      82             :       packets with 10ms of sound data in them
      83             :     */
      84           0 :     if (st->codecpar->sample_rate != 8000) {
      85           0 :         av_log(s, AV_LOG_ERROR, "Sample rate %d is not supported.\n", st->codecpar->sample_rate);
      86           0 :         return AVERROR_INVALIDDATA;
      87             :     }
      88             : 
      89           0 :     st->codecpar->frame_size=80;
      90           0 :     st->codecpar->channels=1;
      91           0 :     avpriv_set_pts_info(st, 64, 1, 100);
      92             : 
      93           0 :     st->codecpar->codec_id=AV_CODEC_ID_G729;
      94             : 
      95           0 :     avio_seek(pb, 257, SEEK_SET);
      96           0 :     msec=avio_rl16(pb);
      97           0 :     sec=avio_r8(pb);
      98           0 :     min=avio_rl32(pb);
      99             : 
     100           0 :     st->duration = av_rescale(1000*(min*60+sec)+msec, st->codecpar->sample_rate, 1000 * st->codecpar->frame_size);
     101             : 
     102           0 :     ctx->bytes_left_in_chunk=CHUNK_SIZE;
     103             : 
     104           0 :     avio_seek(pb, 512, SEEK_SET);
     105             : 
     106           0 :     return 0;
     107             : }
     108             : 
     109             : 
     110           0 : static int read_packet(AVFormatContext *s,
     111             :                           AVPacket *pkt)
     112             : {
     113           0 :     ACTContext *ctx = s->priv_data;
     114           0 :     AVIOContext *pb = s->pb;
     115             :     int ret;
     116           0 :     int frame_size=s->streams[0]->codecpar->sample_rate==8000?10:22;
     117             : 
     118             : 
     119           0 :     if(s->streams[0]->codecpar->sample_rate==8000)
     120           0 :         ret=av_new_packet(pkt, 10);
     121             :     else
     122           0 :         ret=av_new_packet(pkt, 11);
     123             : 
     124           0 :     if(ret)
     125           0 :         return ret;
     126             : 
     127           0 :     if(s->streams[0]->codecpar->sample_rate==4400 && !ctx->second_packet)
     128             :     {
     129           0 :         ret = avio_read(pb, ctx->audio_buffer, frame_size);
     130             : 
     131           0 :         if(ret<0)
     132           0 :             return ret;
     133           0 :         if(ret!=frame_size)
     134           0 :             return AVERROR(EIO);
     135             : 
     136           0 :         pkt->data[0]=ctx->audio_buffer[11];
     137           0 :         pkt->data[1]=ctx->audio_buffer[0];
     138           0 :         pkt->data[2]=ctx->audio_buffer[12];
     139           0 :         pkt->data[3]=ctx->audio_buffer[1];
     140           0 :         pkt->data[4]=ctx->audio_buffer[13];
     141           0 :         pkt->data[5]=ctx->audio_buffer[2];
     142           0 :         pkt->data[6]=ctx->audio_buffer[14];
     143           0 :         pkt->data[7]=ctx->audio_buffer[3];
     144           0 :         pkt->data[8]=ctx->audio_buffer[15];
     145           0 :         pkt->data[9]=ctx->audio_buffer[4];
     146           0 :         pkt->data[10]=ctx->audio_buffer[16];
     147             : 
     148           0 :         ctx->second_packet=1;
     149             :     }
     150           0 :     else if(s->streams[0]->codecpar->sample_rate==4400 && ctx->second_packet)
     151             :     {
     152           0 :         pkt->data[0]=ctx->audio_buffer[5];
     153           0 :         pkt->data[1]=ctx->audio_buffer[17];
     154           0 :         pkt->data[2]=ctx->audio_buffer[6];
     155           0 :         pkt->data[3]=ctx->audio_buffer[18];
     156           0 :         pkt->data[4]=ctx->audio_buffer[7];
     157           0 :         pkt->data[5]=ctx->audio_buffer[19];
     158           0 :         pkt->data[6]=ctx->audio_buffer[8];
     159           0 :         pkt->data[7]=ctx->audio_buffer[20];
     160           0 :         pkt->data[8]=ctx->audio_buffer[9];
     161           0 :         pkt->data[9]=ctx->audio_buffer[21];
     162           0 :         pkt->data[10]=ctx->audio_buffer[10];
     163             : 
     164           0 :         ctx->second_packet=0;
     165             :     }
     166             :     else // 8000 Hz
     167             :     {
     168           0 :         ret = avio_read(pb, ctx->audio_buffer, frame_size);
     169             : 
     170           0 :         if(ret<0)
     171           0 :             return ret;
     172           0 :         if(ret!=frame_size)
     173           0 :             return AVERROR(EIO);
     174             : 
     175           0 :         pkt->data[0]=ctx->audio_buffer[5];
     176           0 :         pkt->data[1]=ctx->audio_buffer[0];
     177           0 :         pkt->data[2]=ctx->audio_buffer[6];
     178           0 :         pkt->data[3]=ctx->audio_buffer[1];
     179           0 :         pkt->data[4]=ctx->audio_buffer[7];
     180           0 :         pkt->data[5]=ctx->audio_buffer[2];
     181           0 :         pkt->data[6]=ctx->audio_buffer[8];
     182           0 :         pkt->data[7]=ctx->audio_buffer[3];
     183           0 :         pkt->data[8]=ctx->audio_buffer[9];
     184           0 :         pkt->data[9]=ctx->audio_buffer[4];
     185             :     }
     186             : 
     187           0 :     ctx->bytes_left_in_chunk -= frame_size;
     188             : 
     189           0 :     if(ctx->bytes_left_in_chunk < frame_size)
     190             :     {
     191           0 :         avio_skip(pb, ctx->bytes_left_in_chunk);
     192           0 :         ctx->bytes_left_in_chunk=CHUNK_SIZE;
     193             :     }
     194             : 
     195           0 :     pkt->duration=1;
     196             : 
     197           0 :     return ret;
     198             : }
     199             : 
     200             : AVInputFormat ff_act_demuxer = {
     201             :     .name           = "act",
     202             :     .long_name      = "ACT Voice file format",
     203             :     .priv_data_size = sizeof(ACTContext),
     204             :     .read_probe     = probe,
     205             :     .read_header    = read_header,
     206             :     .read_packet    = read_packet,
     207             : };

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