libavformat/pvfdec.c

   1 /*
   2  * PVF demuxer
   3  * Copyright (c) 2012 Paul B Mahol
   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 "libavcodec/internal.h"
  23 #include "avformat.h"
  24 #include "internal.h"
  25 #include "pcm.h"
  26
  27 static int pvf_probe(const AVProbeData *p)
  28 {
  29     if (!memcmp(p->buf, "PVF1\n", 5))
  30         return AVPROBE_SCORE_MAX;
  31     return 0;
  32 }
  33
  34 static int pvf_read_header(AVFormatContext *s)
  35 {
  36     char buffer[32];
  37     AVStream *st;
  38     int bps, channels, sample_rate;
  39
  40     avio_skip(s->pb, 5);
  41     ff_get_line(s->pb, buffer, sizeof(buffer));
  42     if (sscanf(buffer, "%d %d %d",
  43                &channels,
  44                &sample_rate,
  45                &bps) != 3)
  46         return AVERROR_INVALIDDATA;
  47
  48     if (channels <= 0 || channels > FF_SANE_NB_CHANNELS ||
  49         bps <= 0 || bps > INT_MAX / FF_SANE_NB_CHANNELS || sample_rate <= 0)
  50         return AVERROR_INVALIDDATA;
  51
  52     st = avformat_new_stream(s, NULL);
  53     if (!st)
  54         return AVERROR(ENOMEM);
  55
  56     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
  57     st->codecpar->channels    = channels;
  58     st->codecpar->sample_rate = sample_rate;
  59     st->codecpar->codec_id    = ff_get_pcm_codec_id(bps, 0, 1, 0xFFFF);
  60     st->codecpar->bits_per_coded_sample = bps;
  61     st->codecpar->block_align = bps * st->codecpar->channels / 8;
  62
  63     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
  64
  65     return 0;
  66 }
  67
  68 AVInputFormat ff_pvf_demuxer = {
  69     .name           = "pvf",
  70     .long_name      = NULL_IF_CONFIG_SMALL("PVF (Portable Voice Format)"),
  71     .read_probe     = pvf_probe,
  72     .read_header    = pvf_read_header,
  73     .read_packet    = ff_pcm_read_packet,
  74     .read_seek      = ff_pcm_read_seek,
  75     .extensions     = "pvf",
  76     .flags          = AVFMT_GENERIC_INDEX,
  77 };