libavformat/genh.c

   1 /*
   2  * GENH demuxer
   3  * Copyright (c) 2015 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 "libavutil/intreadwrite.h"
  23 #include "libavcodec/internal.h"
  24 #include "avformat.h"
  25 #include "internal.h"
  26
  27 typedef struct GENHDemuxContext {
  28     unsigned dsp_int_type;
  29     unsigned interleave_size;
  30 } GENHDemuxContext;
  31
  32 static int genh_probe(const AVProbeData *p)
  33 {
  34     if (AV_RL32(p->buf) != MKTAG('G','E','N','H'))
  35         return 0;
  36     if (AV_RL32(p->buf+4) <= 0 || AV_RL32(p->buf+4) > 0xFFFF) // channels
  37         return 0;
  38
  39     return AVPROBE_SCORE_MAX / 3 * 2;
  40 }
  41
  42 static int genh_read_header(AVFormatContext *s)
  43 {
  44     unsigned start_offset, header_size, codec, coef_type, coef[2];
  45     GENHDemuxContext *c = s->priv_data;
  46     av_unused unsigned coef_splitted[2];
  47     int align, ch, ret;
  48     AVStream *st;
  49
  50     avio_skip(s->pb, 4);
  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    = avio_rl32(s->pb);
  58     if (st->codecpar->channels <= 0 || st->codecpar->channels > FF_SANE_NB_CHANNELS)
  59         return AVERROR_INVALIDDATA;
  60     if (st->codecpar->channels == 1)
  61         st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
  62     else if (st->codecpar->channels == 2)
  63         st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
  64     align                  =
  65     c->interleave_size     = avio_rl32(s->pb);
  66     if (align < 0 || align > INT_MAX / st->codecpar->channels)
  67         return AVERROR_INVALIDDATA;
  68     st->codecpar->block_align = align * st->codecpar->channels;
  69     st->codecpar->sample_rate = avio_rl32(s->pb);
  70     if (st->codecpar->sample_rate < 0)
  71         return AVERROR_INVALIDDATA;
  72
  73     avio_skip(s->pb, 4);
  74     st->duration = avio_rl32(s->pb);
  75
  76     codec = avio_rl32(s->pb);
  77     switch (codec) {
  78     case  0: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;        break;
  79     case  1:
  80     case 11: st->codecpar->bits_per_coded_sample = 4;
  81              st->codecpar->block_align = 36 * st->codecpar->channels;
  82              st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV;    break;
  83     case  2: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_DTK;        break;
  84     case  3: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
  85                                    AV_CODEC_ID_PCM_S16BE_PLANAR :
  86                                    AV_CODEC_ID_PCM_S16BE;        break;
  87     case  4: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
  88                                    AV_CODEC_ID_PCM_S16LE_PLANAR :
  89                                    AV_CODEC_ID_PCM_S16LE;        break;
  90     case  5: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
  91                                    AV_CODEC_ID_PCM_S8_PLANAR :
  92                                    AV_CODEC_ID_PCM_S8;           break;
  93     case  6: if (st->codecpar->block_align > INT_MAX/1024)
  94                  return AVERROR_INVALIDDATA;
  95              st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM;        break;
  96     case  7: ret = ff_alloc_extradata(st->codecpar, 2);
  97              if (ret < 0)
  98                  return ret;
  99              AV_WL16(st->codecpar->extradata, 3);
 100              st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS;     break;
 101     case 10: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA;       break;
 102     case 12: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP;        break;
 103     case 13: st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;           break;
 104     case 17: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_QT;     break;
 105     default:
 106              avpriv_request_sample(s, "codec %d", codec);
 107              return AVERROR_PATCHWELCOME;
 108     }
 109
 110     start_offset = avio_rl32(s->pb);
 111     header_size  = avio_rl32(s->pb);
 112
 113     if (header_size > start_offset)
 114         return AVERROR_INVALIDDATA;
 115
 116     if (header_size == 0)
 117         start_offset = 0x800;
 118
 119     coef[0]          = avio_rl32(s->pb);
 120     coef[1]          = avio_rl32(s->pb);
 121     c->dsp_int_type  = avio_rl32(s->pb);
 122     coef_type        = avio_rl32(s->pb);
 123     coef_splitted[0] = avio_rl32(s->pb);
 124     coef_splitted[1] = avio_rl32(s->pb);
 125
 126     if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_THP) {
 127         if (st->codecpar->channels > 2) {
 128             avpriv_request_sample(s, "channels %d>2", st->codecpar->channels);
 129             return AVERROR_PATCHWELCOME;
 130         }
 131
 132         ff_alloc_extradata(st->codecpar, 32 * st->codecpar->channels);
 133         for (ch = 0; ch < st->codecpar->channels; ch++) {
 134             if (coef_type & 1) {
 135                 avpriv_request_sample(s, "coef_type & 1");
 136                 return AVERROR_PATCHWELCOME;
 137             } else {
 138                 avio_seek(s->pb, coef[ch], SEEK_SET);
 139                 avio_read(s->pb, st->codecpar->extradata + 32 * ch, 32);
 140             }
 141         }
 142
 143         if (c->dsp_int_type == 1) {
 144             st->codecpar->block_align = 8 * st->codecpar->channels;
 145             if (c->interleave_size != 1 &&
 146                 c->interleave_size != 2 &&
 147                 c->interleave_size != 4)
 148                 return AVERROR_INVALIDDATA;
 149         }
 150     }
 151
 152     if (st->codecpar->block_align <= 0)
 153         return AVERROR_INVALIDDATA;
 154
 155     avio_skip(s->pb, start_offset - avio_tell(s->pb));
 156
 157     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
 158
 159     return 0;
 160 }
 161
 162 static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
 163 {
 164     AVCodecParameters *par = s->streams[0]->codecpar;
 165     GENHDemuxContext *c = s->priv_data;
 166     int ret;
 167
 168     if (c->dsp_int_type == 1 && par->codec_id == AV_CODEC_ID_ADPCM_THP &&
 169         par->channels > 1) {
 170         int i, ch;
 171
 172         if (avio_feof(s->pb))
 173             return AVERROR_EOF;
 174         ret = av_new_packet(pkt, 8 * par->channels);
 175         if (ret < 0)
 176             return ret;
 177         for (i = 0; i < 8 / c->interleave_size; i++) {
 178             for (ch = 0; ch < par->channels; ch++) {
 179                 pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb);
 180                 pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb);
 181             }
 182         }
 183         ret = 0;
 184     } else if (par->codec_id == AV_CODEC_ID_SDX2_DPCM) {
 185         ret = av_get_packet(s->pb, pkt, par->block_align * 1024);
 186
 187     } else {
 188         ret = av_get_packet(s->pb, pkt, par->block_align ? par->block_align : 1024 * par->channels);
 189     }
 190
 191     pkt->stream_index = 0;
 192     return ret;
 193 }
 194
 195 AVInputFormat ff_genh_demuxer = {
 196     .name           = "genh",
 197     .long_name      = NULL_IF_CONFIG_SMALL("GENeric Header"),
 198     .priv_data_size = sizeof(GENHDemuxContext),
 199     .read_probe     = genh_probe,
 200     .read_header    = genh_read_header,
 201     .read_packet    = genh_read_packet,
 202     .extensions     = "genh",
 203 };