libavformat/siff.c

   1 /*
   2  * Beam Software SIFF demuxer
   3  * Copyright (c) 2007 Konstantin Shishkov
   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 "avformat.h"
  24
  25 enum SIFFTags{
  26     TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),
  27     TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),
  28     TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),
  29     TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),
  30     TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),
  31     TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),
  32 };
  33
  34 enum VBFlags{
  35     VB_HAS_GMC     = 0x01,
  36     VB_HAS_AUDIO   = 0x04,
  37     VB_HAS_VIDEO   = 0x08,
  38     VB_HAS_PALETTE = 0x10,
  39     VB_HAS_LENGTH  = 0x20
  40 };
  41
  42 typedef struct SIFFContext{
  43     int frames;
  44     int cur_frame;
  45     int rate;
  46     int bits;
  47     int block_align;
  48
  49     int has_video;
  50     int has_audio;
  51
  52     int curstrm;
  53     int pktsize;
  54     int gmcsize;
  55     int sndsize;
  56
  57     int flags;
  58     uint8_t gmc[4];
  59 }SIFFContext;
  60
  61 static int siff_probe(AVProbeData *p)
  62 {
  63     /* check file header */
  64     if (AV_RL32(p->buf) == TAG_SIFF)
  65         return AVPROBE_SCORE_MAX;
  66     else
  67         return 0;
  68 }
  69
  70 static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
  71 {
  72     AVStream *ast;
  73     ast = av_new_stream(s, 0);
  74     if (!ast)
  75         return -1;
  76     ast->codec->codec_type      = CODEC_TYPE_AUDIO;
  77     ast->codec->codec_id        = CODEC_ID_PCM_U8;
  78     ast->codec->channels        = 1;
  79     ast->codec->bits_per_coded_sample = c->bits;
  80     ast->codec->sample_rate     = c->rate;
  81     ast->codec->frame_size      = c->block_align;
  82     av_set_pts_info(ast, 16, 1, c->rate);
  83     return 0;
  84 }
  85
  86 static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
  87 {
  88     AVStream *st;
  89     int width, height;
  90
  91     if (get_le32(pb) != TAG_VBHD){
  92         av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
  93         return -1;
  94     }
  95     if(get_be32(pb) != 32){
  96         av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
  97         return -1;
  98     }
  99     if(get_le16(pb) != 1){
 100         av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
 101         return -1;
 102     }
 103     width = get_le16(pb);
 104     height = get_le16(pb);
 105     url_fskip(pb, 4);
 106     c->frames = get_le16(pb);
 107     if(!c->frames){
 108         av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
 109         return -1;
 110     }
 111     c->bits = get_le16(pb);
 112     c->rate = get_le16(pb);
 113     c->block_align = c->rate * (c->bits >> 3);
 114
 115     url_fskip(pb, 16); //zeroes
 116
 117     st = av_new_stream(s, 0);
 118     if (!st)
 119         return -1;
 120     st->codec->codec_type = CODEC_TYPE_VIDEO;
 121     st->codec->codec_id   = CODEC_ID_VB;
 122     st->codec->codec_tag  = MKTAG('V', 'B', 'V', '1');
 123     st->codec->width      = width;
 124     st->codec->height     = height;
 125     st->codec->pix_fmt    = PIX_FMT_PAL8;
 126     av_set_pts_info(st, 16, 1, 12);
 127
 128     c->cur_frame = 0;
 129     c->has_video = 1;
 130     c->has_audio = !!c->rate;
 131     c->curstrm = -1;
 132     if (c->has_audio && create_audio_stream(s, c) < 0)
 133         return -1;
 134     return 0;
 135 }
 136
 137 static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
 138 {
 139     if (get_le32(pb) != TAG_SHDR){
 140         av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
 141         return -1;
 142     }
 143     if(get_be32(pb) != 8){
 144         av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
 145         return -1;
 146     }
 147     url_fskip(pb, 4); //unknown value
 148     c->rate = get_le16(pb);
 149     c->bits = get_le16(pb);
 150     c->block_align = c->rate * (c->bits >> 3);
 151     return create_audio_stream(s, c);
 152 }
 153
 154 static int siff_read_header(AVFormatContext *s, AVFormatParameters *ap)
 155 {
 156     ByteIOContext *pb = s->pb;
 157     SIFFContext *c = s->priv_data;
 158     uint32_t tag;
 159
 160     if (get_le32(pb) != TAG_SIFF)
 161         return -1;
 162     url_fskip(pb, 4); //ignore size
 163     tag = get_le32(pb);
 164
 165     if (tag != TAG_VBV1 && tag != TAG_SOUN){
 166         av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
 167         return -1;
 168     }
 169
 170     if (tag == TAG_VBV1 && siff_parse_vbv1(s, c, pb) < 0)
 171         return -1;
 172     if (tag == TAG_SOUN && siff_parse_soun(s, c, pb) < 0)
 173         return -1;
 174     if (get_le32(pb) != MKTAG('B', 'O', 'D', 'Y')){
 175         av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
 176         return -1;
 177     }
 178     url_fskip(pb, 4); //ignore size
 179
 180     return 0;
 181 }
 182
 183 static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
 184 {
 185     SIFFContext *c = s->priv_data;
 186     int size;
 187
 188     if (c->has_video){
 189         if (c->cur_frame >= c->frames)
 190             return AVERROR(EIO);
 191         if (c->curstrm == -1){
 192             c->pktsize = get_le32(s->pb) - 4;
 193             c->flags = get_le16(s->pb);
 194             c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
 195             if (c->gmcsize)
 196                 get_buffer(s->pb, c->gmc, c->gmcsize);
 197             c->sndsize = (c->flags & VB_HAS_AUDIO) ? get_le32(s->pb): 0;
 198             c->curstrm = !!(c->flags & VB_HAS_AUDIO);
 199         }
 200
 201         if (!c->curstrm){
 202             size = c->pktsize - c->sndsize;
 203             if (av_new_packet(pkt, size) < 0)
 204                 return AVERROR(ENOMEM);
 205             AV_WL16(pkt->data, c->flags);
 206             if (c->gmcsize)
 207                 memcpy(pkt->data + 2, c->gmc, c->gmcsize);
 208             get_buffer(s->pb, pkt->data + 2 + c->gmcsize, size - c->gmcsize - 2);
 209             pkt->stream_index = 0;
 210             c->curstrm = -1;
 211         }else{
 212             if (av_get_packet(s->pb, pkt, c->sndsize - 4) < 0)
 213                 return AVERROR(EIO);
 214             pkt->stream_index = 1;
 215             c->curstrm = 0;
 216         }
 217         if(!c->cur_frame || c->curstrm)
 218             pkt->flags |= PKT_FLAG_KEY;
 219         if (c->curstrm == -1)
 220             c->cur_frame++;
 221     }else{
 222         size = av_get_packet(s->pb, pkt, c->block_align);
 223         if(size <= 0)
 224             return AVERROR(EIO);
 225     }
 226     return pkt->size;
 227 }
 228
 229 AVInputFormat siff_demuxer = {
 230     "siff",
 231     NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
 232     sizeof(SIFFContext),
 233     siff_probe,
 234     siff_read_header,
 235     siff_read_packet,
 236     .extensions = "vb,son"
 237 };