1/* 2 * Smacker demuxer 3 * Copyright (c) 2006 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/* 23 * Based on http://wiki.multimedia.cx/index.php?title=Smacker 24 */ 25 26#include "libavutil/bswap.h" 27#include "libavutil/intreadwrite.h" 28#include "avformat.h" 29 30#define SMACKER_PAL 0x01 31#define SMACKER_FLAG_RING_FRAME 0x01 32 33enum SAudFlags { 34 SMK_AUD_PACKED = 0x80000000, 35 SMK_AUD_16BITS = 0x20000000, 36 SMK_AUD_STEREO = 0x10000000, 37 SMK_AUD_BINKAUD = 0x08000000, 38 SMK_AUD_USEDCT = 0x04000000 39}; 40 41typedef struct SmackerContext { 42 /* Smacker file header */ 43 uint32_t magic; 44 uint32_t width, height; 45 uint32_t frames; 46 int pts_inc; 47 uint32_t flags; 48 uint32_t audio[7]; 49 uint32_t treesize; 50 uint32_t mmap_size, mclr_size, full_size, type_size; 51 uint32_t rates[7]; 52 uint32_t pad; 53 /* frame info */ 54 uint32_t *frm_size; 55 uint8_t *frm_flags; 56 /* internal variables */ 57 int cur_frame; 58 int is_ver4; 59 int64_t cur_pts; 60 /* current frame for demuxing */ 61 uint8_t pal[768]; 62 int indexes[7]; 63 int videoindex; 64 uint8_t *bufs[7]; 65 int buf_sizes[7]; 66 int stream_id[7]; 67 int curstream; 68 int64_t nextpos; 69 int64_t aud_pts[7]; 70} SmackerContext; 71 72typedef struct SmackerFrame { 73 int64_t pts; 74 int stream; 75} SmackerFrame; 76 77/* palette used in Smacker */ 78static const uint8_t smk_pal[64] = { 79 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C, 80 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C, 81 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D, 82 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D, 83 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E, 84 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE, 85 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF, 86 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF 87}; 88 89 90static int smacker_probe(AVProbeData *p) 91{ 92 if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K' 93 && (p->buf[3] == '2' || p->buf[3] == '4')) 94 return AVPROBE_SCORE_MAX; 95 else 96 return 0; 97} 98 99static int smacker_read_header(AVFormatContext *s, AVFormatParameters *ap) 100{ 101 ByteIOContext *pb = s->pb; 102 SmackerContext *smk = s->priv_data; 103 AVStream *st, *ast[7]; 104 int i, ret; 105 int tbase; 106 107 /* read and check header */ 108 smk->magic = get_le32(pb); 109 if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4')) 110 return -1; 111 smk->width = get_le32(pb); 112 smk->height = get_le32(pb); 113 smk->frames = get_le32(pb); 114 smk->pts_inc = (int32_t)get_le32(pb); 115 smk->flags = get_le32(pb); 116 if(smk->flags & SMACKER_FLAG_RING_FRAME) 117 smk->frames++; 118 for(i = 0; i < 7; i++) 119 smk->audio[i] = get_le32(pb); 120 smk->treesize = get_le32(pb); 121 122 if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant) 123 av_log(s, AV_LOG_ERROR, "treesize too large\n"); 124 return -1; 125 } 126 127//FIXME remove extradata "rebuilding" 128 smk->mmap_size = get_le32(pb); 129 smk->mclr_size = get_le32(pb); 130 smk->full_size = get_le32(pb); 131 smk->type_size = get_le32(pb); 132 for(i = 0; i < 7; i++) 133 smk->rates[i] = get_le32(pb); 134 smk->pad = get_le32(pb); 135 /* setup data */ 136 if(smk->frames > 0xFFFFFF) { 137 av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames); 138 return -1; 139 } 140 smk->frm_size = av_malloc(smk->frames * 4); 141 smk->frm_flags = av_malloc(smk->frames); 142 143 smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2')); 144 145 /* read frame info */ 146 for(i = 0; i < smk->frames; i++) { 147 smk->frm_size[i] = get_le32(pb); 148 } 149 for(i = 0; i < smk->frames; i++) { 150 smk->frm_flags[i] = get_byte(pb); 151 } 152 153 /* init video codec */ 154 st = av_new_stream(s, 0); 155 if (!st) 156 return -1; 157 smk->videoindex = st->index; 158 st->codec->width = smk->width; 159 st->codec->height = smk->height; 160 st->codec->pix_fmt = PIX_FMT_PAL8; 161 st->codec->codec_type = CODEC_TYPE_VIDEO; 162 st->codec->codec_id = CODEC_ID_SMACKVIDEO; 163 st->codec->codec_tag = smk->magic; 164 /* Smacker uses 100000 as internal timebase */ 165 if(smk->pts_inc < 0) 166 smk->pts_inc = -smk->pts_inc; 167 else 168 smk->pts_inc *= 100; 169 tbase = 100000; 170 av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1); 171 av_set_pts_info(st, 33, smk->pts_inc, tbase); 172 /* handle possible audio streams */ 173 for(i = 0; i < 7; i++) { 174 smk->indexes[i] = -1; 175 if((smk->rates[i] & 0xFFFFFF) && !(smk->rates[i] & SMK_AUD_BINKAUD)){ 176 ast[i] = av_new_stream(s, 0); 177 smk->indexes[i] = ast[i]->index; 178 ast[i]->codec->codec_type = CODEC_TYPE_AUDIO; 179 ast[i]->codec->codec_id = (smk->rates[i] & SMK_AUD_PACKED) ? CODEC_ID_SMACKAUDIO : CODEC_ID_PCM_U8; 180 ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A'); 181 ast[i]->codec->channels = (smk->rates[i] & SMK_AUD_STEREO) ? 2 : 1; 182 ast[i]->codec->sample_rate = smk->rates[i] & 0xFFFFFF; 183 ast[i]->codec->bits_per_coded_sample = (smk->rates[i] & SMK_AUD_16BITS) ? 16 : 8; 184 if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8) 185 ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE; 186 av_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate 187 * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8); 188 } 189 } 190 191 192 /* load trees to extradata, they will be unpacked by decoder */ 193 st->codec->extradata = av_malloc(smk->treesize + 16); 194 st->codec->extradata_size = smk->treesize + 16; 195 if(!st->codec->extradata){ 196 av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16); 197 av_free(smk->frm_size); 198 av_free(smk->frm_flags); 199 return -1; 200 } 201 ret = get_buffer(pb, st->codec->extradata + 16, st->codec->extradata_size - 16); 202 if(ret != st->codec->extradata_size - 16){ 203 av_free(smk->frm_size); 204 av_free(smk->frm_flags); 205 return AVERROR(EIO); 206 } 207 ((int32_t*)st->codec->extradata)[0] = le2me_32(smk->mmap_size); 208 ((int32_t*)st->codec->extradata)[1] = le2me_32(smk->mclr_size); 209 ((int32_t*)st->codec->extradata)[2] = le2me_32(smk->full_size); 210 ((int32_t*)st->codec->extradata)[3] = le2me_32(smk->type_size); 211 212 smk->curstream = -1; 213 smk->nextpos = url_ftell(pb); 214 215 return 0; 216} 217 218 219static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt) 220{ 221 SmackerContext *smk = s->priv_data; 222 int flags; 223 int ret; 224 int i; 225 int frame_size = 0; 226 int palchange = 0; 227 int pos; 228 229 if (url_feof(s->pb) || smk->cur_frame >= smk->frames) 230 return AVERROR(EIO); 231 232 /* if we demuxed all streams, pass another frame */ 233 if(smk->curstream < 0) { 234 url_fseek(s->pb, smk->nextpos, 0); 235 frame_size = smk->frm_size[smk->cur_frame] & (~3); 236 flags = smk->frm_flags[smk->cur_frame]; 237 /* handle palette change event */ 238 pos = url_ftell(s->pb); 239 if(flags & SMACKER_PAL){ 240 int size, sz, t, off, j, pos; 241 uint8_t *pal = smk->pal; 242 uint8_t oldpal[768]; 243 244 memcpy(oldpal, pal, 768); 245 size = get_byte(s->pb); 246 size = size * 4 - 1; 247 frame_size -= size; 248 frame_size--; 249 sz = 0; 250 pos = url_ftell(s->pb) + size; 251 while(sz < 256){ 252 t = get_byte(s->pb); 253 if(t & 0x80){ /* skip palette entries */ 254 sz += (t & 0x7F) + 1; 255 pal += ((t & 0x7F) + 1) * 3; 256 } else if(t & 0x40){ /* copy with offset */ 257 off = get_byte(s->pb) * 3; 258 j = (t & 0x3F) + 1; 259 while(j-- && sz < 256) { 260 *pal++ = oldpal[off + 0]; 261 *pal++ = oldpal[off + 1]; 262 *pal++ = oldpal[off + 2]; 263 sz++; 264 off += 3; 265 } 266 } else { /* new entries */ 267 *pal++ = smk_pal[t]; 268 *pal++ = smk_pal[get_byte(s->pb) & 0x3F]; 269 *pal++ = smk_pal[get_byte(s->pb) & 0x3F]; 270 sz++; 271 } 272 } 273 url_fseek(s->pb, pos, 0); 274 palchange |= 1; 275 } 276 flags >>= 1; 277 smk->curstream = -1; 278 /* if audio chunks are present, put them to stack and retrieve later */ 279 for(i = 0; i < 7; i++) { 280 if(flags & 1) { 281 int size; 282 size = get_le32(s->pb) - 4; 283 frame_size -= size; 284 frame_size -= 4; 285 smk->curstream++; 286 smk->bufs[smk->curstream] = av_realloc(smk->bufs[smk->curstream], size); 287 smk->buf_sizes[smk->curstream] = size; 288 ret = get_buffer(s->pb, smk->bufs[smk->curstream], size); 289 if(ret != size) 290 return AVERROR(EIO); 291 smk->stream_id[smk->curstream] = smk->indexes[i]; 292 } 293 flags >>= 1; 294 } 295 if (av_new_packet(pkt, frame_size + 768)) 296 return AVERROR(ENOMEM); 297 if(smk->frm_size[smk->cur_frame] & 1) 298 palchange |= 2; 299 pkt->data[0] = palchange; 300 memcpy(pkt->data + 1, smk->pal, 768); 301 ret = get_buffer(s->pb, pkt->data + 769, frame_size); 302 if(ret != frame_size) 303 return AVERROR(EIO); 304 pkt->stream_index = smk->videoindex; 305 pkt->size = ret + 769; 306 smk->cur_frame++; 307 smk->nextpos = url_ftell(s->pb); 308 } else { 309 if (av_new_packet(pkt, smk->buf_sizes[smk->curstream])) 310 return AVERROR(ENOMEM); 311 memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]); 312 pkt->size = smk->buf_sizes[smk->curstream]; 313 pkt->stream_index = smk->stream_id[smk->curstream]; 314 pkt->pts = smk->aud_pts[smk->curstream]; 315 smk->aud_pts[smk->curstream] += AV_RL32(pkt->data); 316 smk->curstream--; 317 } 318 319 return 0; 320} 321 322static int smacker_read_close(AVFormatContext *s) 323{ 324 SmackerContext *smk = s->priv_data; 325 int i; 326 327 for(i = 0; i < 7; i++) 328 if(smk->bufs[i]) 329 av_free(smk->bufs[i]); 330 if(smk->frm_size) 331 av_free(smk->frm_size); 332 if(smk->frm_flags) 333 av_free(smk->frm_flags); 334 335 return 0; 336} 337 338AVInputFormat smacker_demuxer = { 339 "smk", 340 NULL_IF_CONFIG_SMALL("Smacker video"), 341 sizeof(SmackerContext), 342 smacker_probe, 343 smacker_read_header, 344 smacker_read_packet, 345 smacker_read_close, 346}; 347