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     uint32_t tag = AV_RL32(p->buf + 8);
  64     /* check file header */
  65     if (AV_RL32(p->buf) != TAG_SIFF ||
  66         (tag != TAG_VBV1 && tag != TAG_SOUN))
  67         return 0;
  68     return AVPROBE_SCORE_MAX;
  69 }
  70
  71 static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
  72 {
  73     AVStream *ast;
  74     ast = av_new_stream(s, 0);
  75     if (!ast)
  76         return -1;
  77     ast->codec->codec_type      = CODEC_TYPE_AUDIO;
  78     ast->codec->codec_id        = CODEC_ID_PCM_U8;
  79     ast->codec->channels        = 1;
  80     ast->codec->bits_per_coded_sample = c->bits;
  81     ast->codec->sample_rate     = c->rate;
  82     ast->codec->frame_size      = c->block_align;
  83     av_set_pts_info(ast, 16, 1, c->rate);
  84     return 0;
  85 }
  86
  87 static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
  88 {
  89     AVStream *st;
  90     int width, height;
  91
  92     if (get_le32(pb) != TAG_VBHD){
  93         av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
  94         return -1;
  95     }
  96     if(get_be32(pb) != 32){
  97         av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
  98         return -1;
  99     }
 100     if(get_le16(pb) != 1){
 101         av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
 102         return -1;
 103     }
 104     width = get_le16(pb);
 105     height = get_le16(pb);
 106     url_fskip(pb, 4);
 107     c->frames = get_le16(pb);
 108     if(!c->frames){
 109         av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
 110         return -1;
 111     }
 112     c->bits = get_le16(pb);
 113     c->rate = get_le16(pb);
 114     c->block_align = c->rate * (c->bits >> 3);
 115
 116     url_fskip(pb, 16); //zeroes
 117
 118     st = av_new_stream(s, 0);
 119     if (!st)
 120         return -1;
 121     st->codec->codec_type = CODEC_TYPE_VIDEO;
 122     st->codec->codec_id   = CODEC_ID_VB;
 123     st->codec->codec_tag  = MKTAG('V', 'B', 'V', '1');
 124     st->codec->width      = width;
 125     st->codec->height     = height;
 126     st->codec->pix_fmt    = PIX_FMT_PAL8;
 127     av_set_pts_info(st, 16, 1, 12);
 128
 129     c->cur_frame = 0;
 130     c->has_video = 1;
 131     c->has_audio = !!c->rate;
 132     c->curstrm = -1;
 133     if (c->has_audio && create_audio_stream(s, c) < 0)
 134         return -1;
 135     return 0;
 136 }
 137
 138 static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
 139 {
 140     if (get_le32(pb) != TAG_SHDR){
 141         av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
 142         return -1;
 143     }
 144     if(get_be32(pb) != 8){
 145         av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
 146         return -1;
 147     }
 148     url_fskip(pb, 4); //unknown value
 149     c->rate = get_le16(pb);
 150     c->bits = get_le16(pb);
 151     c->block_align = c->rate * (c->bits >> 3);
 152     return create_audio_stream(s, c);
 153 }
 154
 155 static int siff_read_header(AVFormatContext *s, AVFormatParameters *ap)
 156 {
 157     ByteIOContext *pb = s->pb;
 158     SIFFContext *c = s->priv_data;
 159     uint32_t tag;
 160
 161     if (get_le32(pb) != TAG_SIFF)
 162         return -1;
 163     url_fskip(pb, 4); //ignore size
 164     tag = get_le32(pb);
 165
 166     if (tag != TAG_VBV1 && tag != TAG_SOUN){
 167         av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
 168         return -1;
 169     }
 170
 171     if (tag == TAG_VBV1 && siff_parse_vbv1(s, c, pb) < 0)
 172         return -1;
 173     if (tag == TAG_SOUN && siff_parse_soun(s, c, pb) < 0)
 174         return -1;
 175     if (get_le32(pb) != MKTAG('B', 'O', 'D', 'Y')){
 176         av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
 177         return -1;
 178     }
 179     url_fskip(pb, 4); //ignore size
 180
 181     return 0;
 182 }
 183
 184 static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
 185 {
 186     SIFFContext *c = s->priv_data;
 187     int size;
 188
 189     if (c->has_video){
 190         if (c->cur_frame >= c->frames)
 191             return AVERROR(EIO);
 192         if (c->curstrm == -1){
 193             c->pktsize = get_le32(s->pb) - 4;
 194             c->flags = get_le16(s->pb);
 195             c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
 196             if (c->gmcsize)
 197                 get_buffer(s->pb, c->gmc, c->gmcsize);
 198             c->sndsize = (c->flags & VB_HAS_AUDIO) ? get_le32(s->pb): 0;
 199             c->curstrm = !!(c->flags & VB_HAS_AUDIO);
 200         }
 201
 202         if (!c->curstrm){
 203             size = c->pktsize - c->sndsize;
 204             if (av_new_packet(pkt, size) < 0)
 205                 return AVERROR(ENOMEM);
 206             AV_WL16(pkt->data, c->flags);
 207             if (c->gmcsize)
 208                 memcpy(pkt->data + 2, c->gmc, c->gmcsize);
 209             get_buffer(s->pb, pkt->data + 2 + c->gmcsize, size - c->gmcsize - 2);
 210             pkt->stream_index = 0;
 211             c->curstrm = -1;
 212         }else{
 213             if (av_get_packet(s->pb, pkt, c->sndsize - 4) < 0)
 214                 return AVERROR(EIO);
 215             pkt->stream_index = 1;
 216             c->curstrm = 0;
 217         }
 218         if(!c->cur_frame || c->curstrm)
 219             pkt->flags |= PKT_FLAG_KEY;
 220         if (c->curstrm == -1)
 221             c->cur_frame++;
 222     }else{
 223         size = av_get_packet(s->pb, pkt, c->block_align);
 224         if(size <= 0)
 225             return AVERROR(EIO);
 226     }
 227     return pkt->size;
 228 }
 229
 230 AVInputFormat siff_demuxer = {
 231     "siff",
 232     NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
 233     sizeof(SIFFContext),
 234     siff_probe,
 235     siff_read_header,
 236     siff_read_packet,
 237     .extensions = "vb,son"
 238 };