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 25enum 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 34enum 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 42typedef 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 61static 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 70static 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 86static 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 137static 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 154static 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 183static 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 229AVInputFormat 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}; 238