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 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 71static 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 = AVMEDIA_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 87static 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 = AVMEDIA_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 138static 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 155static 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 184static 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 |= AV_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 230AVInputFormat 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}; 239