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 "avformat.h"
  23
  24 enum SIFFTags{
  25     TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),
  26     TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),
  27     TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),
  28     TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),
  29     TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),
  30     TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),
  31 };
  32
  33 enum VBFlags{
  34     VB_HAS_GMC     = 0x01,
  35     VB_HAS_AUDIO   = 0x04,
  36     VB_HAS_VIDEO   = 0x08,
  37     VB_HAS_PALETTE = 0x10,
  38     VB_HAS_LENGTH  = 0x20
  39 };
  40
  41 typedef struct SIFFContext{
  42     int frames;
  43     int cur_frame;
  44     int rate;
  45     int bits;
  46     int block_align;
  47
  48     int has_video;
  49     int has_audio;
  50
  51     int curstrm;
  52     int pktsize;
  53     int gmcsize;
  54     int sndsize;
  55
  56     int flags;
  57     uint8_t gmc[4];
  58 }SIFFContext;
  59
  60 static int siff_probe(AVProbeData *p)
  61 {
  62     /* check file header */
  63     if (AV_RL32(p->buf) == TAG_SIFF)
  64         return AVPROBE_SCORE_MAX;
  65     else
  66         return 0;
  67 }
  68
  69 static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
  70 {
  71     AVStream *ast;
  72     ast = av_new_stream(s, 0);
  73     if (!ast)
  74         return -1;
  75     ast->codec->codec_type      = CODEC_TYPE_AUDIO;
  76     ast->codec->codec_id        = CODEC_ID_PCM_U8;
  77     ast->codec->channels        = 1;
  78     ast->codec->bits_per_sample = c->bits;
  79     ast->codec->sample_rate     = c->rate;
  80     ast->codec->frame_size      = c->block_align;
  81     av_set_pts_info(ast, 16, 1, c->rate);
  82     return 0;
  83 }
  84
  85 static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
  86 {
  87     AVStream *st;
  88     int width, height;
  89
  90     if (get_le32(pb) != TAG_VBHD){
  91         av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
  92         return -1;
  93     }
  94     if(get_be32(pb) != 32){
  95         av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
  96         return -1;
  97     }
  98     if(get_le16(pb) != 1){
  99         av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
 100         return -1;
 101     }
 102     width = get_le16(pb);
 103     height = get_le16(pb);
 104     url_fskip(pb, 4);
 105     c->frames = get_le16(pb);
 106     if(!c->frames){
 107         av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
 108         return -1;
 109     }
 110     c->bits = get_le16(pb);
 111     c->rate = get_le16(pb);
 112     c->block_align = c->rate * (c->bits >> 3);
 113
 114     url_fskip(pb, 16); //zeroes
 115
 116     st = av_new_stream(s, 0);
 117     if (!st)
 118         return -1;
 119     st->codec->codec_type = CODEC_TYPE_VIDEO;
 120     st->codec->codec_id   = CODEC_ID_VB;
 121     st->codec->codec_tag  = MKTAG('V', 'B', 'V', '1');
 122     st->codec->width      = width;
 123     st->codec->height     = height;
 124     st->codec->pix_fmt    = PIX_FMT_PAL8;
 125     av_set_pts_info(st, 16, 1, 12);
 126
 127     c->cur_frame = 0;
 128     c->has_video = 1;
 129     c->has_audio = !!c->rate;
 130     c->curstrm = -1;
 131     if (c->has_audio && create_audio_stream(s, c) < 0)
 132         return -1;
 133     return 0;
 134 }
 135
 136 static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
 137 {
 138     if (get_le32(pb) != TAG_SHDR){
 139         av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
 140         return -1;
 141     }
 142     if(get_be32(pb) != 8){
 143         av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
 144         return -1;
 145     }
 146     url_fskip(pb, 4); //unknown value
 147     c->rate = get_le16(pb);
 148     c->bits = get_le16(pb);
 149     c->block_align = c->rate * (c->bits >> 3);
 150     return create_audio_stream(s, c);
 151 }
 152
 153 static int siff_read_header(AVFormatContext *s, AVFormatParameters *ap)
 154 {
 155     ByteIOContext *pb = s->pb;
 156     SIFFContext *c = s->priv_data;
 157     uint32_t tag;
 158
 159     if (get_le32(pb) != TAG_SIFF)
 160         return -1;
 161     url_fskip(pb, 4); //ignore size
 162     tag = get_le32(pb);
 163
 164     if (tag != TAG_VBV1 && tag != TAG_SOUN){
 165         av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
 166         return -1;
 167     }
 168
 169     if (tag == TAG_VBV1 && siff_parse_vbv1(s, c, pb) < 0)
 170         return -1;
 171     if (tag == TAG_SOUN && siff_parse_soun(s, c, pb) < 0)
 172         return -1;
 173     if (get_le32(pb) != MKTAG('B', 'O', 'D', 'Y')){
 174         av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
 175         return -1;
 176     }
 177     url_fskip(pb, 4); //ignore size
 178
 179     return 0;
 180 }
 181
 182 static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
 183 {
 184     SIFFContext *c = s->priv_data;
 185     int size;
 186
 187     if (c->has_video){
 188         if (c->cur_frame >= c->frames)
 189             return AVERROR(EIO);
 190         if (c->curstrm == -1){
 191             c->pktsize = get_le32(s->pb) - 4;
 192             c->flags = get_le16(s->pb);
 193             c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
 194             if (c->gmcsize)
 195                 get_buffer(s->pb, c->gmc, c->gmcsize);
 196             c->sndsize = (c->flags & VB_HAS_AUDIO) ? get_le32(s->pb): 0;
 197             c->curstrm = !!(c->flags & VB_HAS_AUDIO);
 198         }
 199
 200         if (!c->curstrm){
 201             size = c->pktsize - c->sndsize;
 202             if (av_new_packet(pkt, size) < 0)
 203                 return AVERROR(ENOMEM);
 204             AV_WL16(pkt->data, c->flags);
 205             if (c->gmcsize)
 206                 memcpy(pkt->data + 2, c->gmc, c->gmcsize);
 207             get_buffer(s->pb, pkt->data + 2 + c->gmcsize, size - c->gmcsize - 2);
 208             pkt->stream_index = 0;
 209             c->curstrm = -1;
 210         }else{
 211             if (av_get_packet(s->pb, pkt, c->sndsize - 4) < 0)
 212                 return AVERROR(EIO);
 213             pkt->stream_index = 1;
 214             c->curstrm = 0;
 215         }
 216         if(!c->cur_frame || c->curstrm)
 217             pkt->flags |= PKT_FLAG_KEY;
 218         if (c->curstrm == -1)
 219             c->cur_frame++;
 220     }else{
 221         size = av_get_packet(s->pb, pkt, c->block_align);
 222         if(size <= 0)
 223             return AVERROR(EIO);
 224     }
 225     return pkt->size;
 226 }
 227
 228 AVInputFormat siff_demuxer = {
 229     "siff",
 230     NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
 231     sizeof(SIFFContext),
 232     siff_probe,
 233     siff_read_header,
 234     siff_read_packet,
 235     .extensions = "vb,son"
 236 };