FFmpeg: libavformat/smacker.c Source File

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libavformat

smacker.c

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1 /*

2 * Smacker demuxer

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 */

22 /*

23 * Based on http://wiki.multimedia.cx/index.php?title=Smacker

24 */

26 #include <inttypes.h>

28 #include "libavutil/bswap.h"

29 #include "libavutil/channel_layout.h"

30 #include "libavutil/intreadwrite.h"

31 #include "avformat.h"

32 #include "internal.h"

34 #define SMACKER_PAL 0x01

35 #define SMACKER_FLAG_RING_FRAME 0x01

37 enum SAudFlags {

38 SMK_AUD_PACKED = 0x80,

39 SMK_AUD_16BITS = 0x20,

40 SMK_AUD_STEREO = 0x10,

41 SMK_AUD_BINKAUD = 0x08,

42 SMK_AUD_USEDCT = 0x04

43 };

45 typedef struct SmackerContext {

46 /* Smacker file header */

47 uint32_t magic;

48 uint32_t width, height;

49 uint32_t frames;

50 int pts_inc;

51 uint32_t flags;

52 uint32_t audio[7];

53 uint32_t treesize;

54 uint32_t mmap_size, mclr_size, full_size, type_size;

55 uint8_t aflags[7];

56 uint32_t rates[7];

57 uint32_t pad;

58 /* frame info */

59 uint32_t *frm_size;

60 uint8_t *frm_flags;

61 /* internal variables */

62 int cur_frame;

63 int is_ver4;

64 int64_t cur_pts;

65 /* current frame for demuxing */

66 uint8_t pal[768];

67 int indexes[7];

68 int videoindex;

69 uint8_t *bufs[7];

70 int buf_sizes[7];

71 int stream_id[7];

72 int curstream;

73 int64_t nextpos;

74 int64_t aud_pts[7];

75 } SmackerContext;

77 typedef struct SmackerFrame {

78 int64_t pts;

79 int stream;

80 } SmackerFrame;

82 /* palette used in Smacker */

83 static const uint8_t smk_pal[64] = {

84 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,

85 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,

86 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,

87 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,

88 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,

89 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,

90 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,

91 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF

92 };

95 static int smacker_probe(AVProbeData *p)

96 {

97 if ( AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '2')

98 && AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '4'))

99 return 0;

100

101 if (AV_RL32(p->buf+4) > 32768U || AV_RL32(p->buf+8) > 32768U)

102 return AVPROBE_SCORE_MAX/4;

103

104 return AVPROBE_SCORE_MAX;

105 }

106

107 static int smacker_read_header(AVFormatContext *s)

108 {

109 AVIOContext *pb = s->pb;

110 SmackerContext *smk = s->priv_data;

111 AVStream *st, *ast[7];

112 int i, ret;

113 int tbase;

114

115 /* read and check header */

116 smk->magic = avio_rl32(pb);

117 if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))

118 return AVERROR_INVALIDDATA;

119 smk->width = avio_rl32(pb);

120 smk->height = avio_rl32(pb);

121 smk->frames = avio_rl32(pb);

122 smk->pts_inc = (int32_t)avio_rl32(pb);

123 smk->flags = avio_rl32(pb);

124 if(smk->flags & SMACKER_FLAG_RING_FRAME)

125 smk->frames++;

126 for(i = 0; i < 7; i++)

127 smk->audio[i] = avio_rl32(pb);

128 smk->treesize = avio_rl32(pb);

129

130 if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)

131 av_log(s, AV_LOG_ERROR, "treesize too large\n");

132 return AVERROR_INVALIDDATA;

133 }

134

135 //FIXME remove extradata "rebuilding"

136 smk->mmap_size = avio_rl32(pb);

137 smk->mclr_size = avio_rl32(pb);

138 smk->full_size = avio_rl32(pb);

139 smk->type_size = avio_rl32(pb);

140 for(i = 0; i < 7; i++) {

141 smk->rates[i] = avio_rl24(pb);

142 smk->aflags[i] = avio_r8(pb);

143 }

144 smk->pad = avio_rl32(pb);

145 /* setup data */

146 if(smk->frames > 0xFFFFFF) {

147 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames);

148 return AVERROR_INVALIDDATA;

149 }

150 smk->frm_size = av_malloc_array(smk->frames, sizeof(*smk->frm_size));

151 smk->frm_flags = av_malloc(smk->frames);

152 if (!smk->frm_size || !smk->frm_flags) {

153 av_freep(&smk->frm_size);

154 av_freep(&smk->frm_flags);

155 return AVERROR(ENOMEM);

156 }

157

158 smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));

159

160 /* read frame info */

161 for(i = 0; i < smk->frames; i++) {

162 smk->frm_size[i] = avio_rl32(pb);

163 }

164 for(i = 0; i < smk->frames; i++) {

165 smk->frm_flags[i] = avio_r8(pb);

166 }

167

168 /* init video codec */

169 st = avformat_new_stream(s, NULL);

170 if (!st)

171 return AVERROR(ENOMEM);

172 smk->videoindex = st->index;

173 st->codec->width = smk->width;

174 st->codec->height = smk->height;

175 st->codec->pix_fmt = AV_PIX_FMT_PAL8;

176 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

177 st->codec->codec_id = AV_CODEC_ID_SMACKVIDEO;

178 st->codec->codec_tag = smk->magic;

179 /* Smacker uses 100000 as internal timebase */

180 if(smk->pts_inc < 0)

181 smk->pts_inc = -smk->pts_inc;

182 else

183 smk->pts_inc *= 100;

184 tbase = 100000;

185 av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);

186 avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);

187 st->duration = smk->frames;

188 /* handle possible audio streams */

189 for(i = 0; i < 7; i++) {

190 smk->indexes[i] = -1;

191 if (smk->rates[i]) {

192 ast[i] = avformat_new_stream(s, NULL);

193 if (!ast[i])

194 return AVERROR(ENOMEM);

195 smk->indexes[i] = ast[i]->index;

196 ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO;

197 if (smk->aflags[i] & SMK_AUD_BINKAUD) {

198 ast[i]->codec->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;

199 } else if (smk->aflags[i] & SMK_AUD_USEDCT) {

200 ast[i]->codec->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;

201 } else if (smk->aflags[i] & SMK_AUD_PACKED){

202 ast[i]->codec->codec_id = AV_CODEC_ID_SMACKAUDIO;

203 ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');

204 } else {

205 ast[i]->codec->codec_id = AV_CODEC_ID_PCM_U8;

206 }

207 if (smk->aflags[i] & SMK_AUD_STEREO) {

208 ast[i]->codec->channels = 2;

209 ast[i]->codec->channel_layout = AV_CH_LAYOUT_STEREO;

210 } else {

211 ast[i]->codec->channels = 1;

212 ast[i]->codec->channel_layout = AV_CH_LAYOUT_MONO;

213 }

214 ast[i]->codec->sample_rate = smk->rates[i];

215 ast[i]->codec->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;

216 if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == AV_CODEC_ID_PCM_U8)

217 ast[i]->codec->codec_id = AV_CODEC_ID_PCM_S16LE;

218 avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate

219 * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);

220 }

221 }

222

223

224 /* load trees to extradata, they will be unpacked by decoder */

225 if(ff_alloc_extradata(st->codec, smk->treesize + 16)){

226 av_log(s, AV_LOG_ERROR,

227 "Cannot allocate %"PRIu32" bytes of extradata\n",

228 smk->treesize + 16);

229 av_freep(&smk->frm_size);

230 av_freep(&smk->frm_flags);

231 return AVERROR(ENOMEM);

232 }

233 ret = avio_read(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);

234 if(ret != st->codec->extradata_size - 16){

235 av_freep(&smk->frm_size);

236 av_freep(&smk->frm_flags);

237 return AVERROR(EIO);

238 }

239 ((int32_t*)st->codec->extradata)[0] = av_le2ne32(smk->mmap_size);

240 ((int32_t*)st->codec->extradata)[1] = av_le2ne32(smk->mclr_size);

241 ((int32_t*)st->codec->extradata)[2] = av_le2ne32(smk->full_size);

242 ((int32_t*)st->codec->extradata)[3] = av_le2ne32(smk->type_size);

243

244 smk->curstream = -1;

245 smk->nextpos = avio_tell(pb);

246

247 return 0;

248 }

249

250

251 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)

252 {

253 SmackerContext *smk = s->priv_data;

254 int flags;

255 int ret;

256 int i;

257 int frame_size = 0;

258 int palchange = 0;

259

260 if (avio_feof(s->pb) || smk->cur_frame >= smk->frames)

261 return AVERROR_EOF;

262

263 /* if we demuxed all streams, pass another frame */

264 if(smk->curstream < 0) {

265 avio_seek(s->pb, smk->nextpos, 0);

266 frame_size = smk->frm_size[smk->cur_frame] & (~3);

267 flags = smk->frm_flags[smk->cur_frame];

268 /* handle palette change event */

269 if(flags & SMACKER_PAL){

270 int size, sz, t, off, j, pos;

271 uint8_t *pal = smk->pal;

272 uint8_t oldpal[768];

273

274 memcpy(oldpal, pal, 768);

275 size = avio_r8(s->pb);

276 size = size * 4 - 1;

277 if(size + 1 > frame_size)

278 return AVERROR_INVALIDDATA;

279 frame_size -= size;

280 frame_size--;

281 sz = 0;

282 pos = avio_tell(s->pb) + size;

283 while(sz < 256){

284 t = avio_r8(s->pb);

285 if(t & 0x80){ /* skip palette entries */

286 sz += (t & 0x7F) + 1;

287 pal += ((t & 0x7F) + 1) * 3;

288 } else if(t & 0x40){ /* copy with offset */

289 off = avio_r8(s->pb);

290 j = (t & 0x3F) + 1;

291 if (off + j > 0x100) {

292 av_log(s, AV_LOG_ERROR,

293 "Invalid palette update, offset=%d length=%d extends beyond palette size\n",

294 off, j);

295 return AVERROR_INVALIDDATA;

296 }

297 off *= 3;

298 while(j-- && sz < 256) {

299 *pal++ = oldpal[off + 0];

300 *pal++ = oldpal[off + 1];

301 *pal++ = oldpal[off + 2];

302 sz++;

303 off += 3;

304 }

305 } else { /* new entries */

306 *pal++ = smk_pal[t];

307 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];

308 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];

309 sz++;

310 }

311 }

312 avio_seek(s->pb, pos, 0);

313 palchange |= 1;

314 }

315 flags >>= 1;

316 smk->curstream = -1;

317 /* if audio chunks are present, put them to stack and retrieve later */

318 for(i = 0; i < 7; i++) {

319 if(flags & 1) {

320 uint32_t size;

321 int err;

322

323 size = avio_rl32(s->pb) - 4;

324 if (!size || size + 4LL > frame_size) {

325 av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");

326 return AVERROR_INVALIDDATA;

327 }

328 frame_size -= size;

329 frame_size -= 4;

330 smk->curstream++;

331 if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0) {

332 smk->buf_sizes[smk->curstream] = 0;

333 return err;

334 }

335 smk->buf_sizes[smk->curstream] = size;

336 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);

337 if(ret != size)

338 return AVERROR(EIO);

339 smk->stream_id[smk->curstream] = smk->indexes[i];

340 }

341 flags >>= 1;

342 }

343 if (frame_size < 0 || frame_size >= INT_MAX/2)

344 return AVERROR_INVALIDDATA;

345 if (av_new_packet(pkt, frame_size + 769))

346 return AVERROR(ENOMEM);

347 if(smk->frm_size[smk->cur_frame] & 1)

348 palchange |= 2;

349 pkt->data[0] = palchange;

350 memcpy(pkt->data + 1, smk->pal, 768);

351 ret = avio_read(s->pb, pkt->data + 769, frame_size);

352 if(ret != frame_size)

353 return AVERROR(EIO);

354 pkt->stream_index = smk->videoindex;

355 pkt->pts = smk->cur_frame;

356 pkt->size = ret + 769;

357 smk->cur_frame++;

358 smk->nextpos = avio_tell(s->pb);

359 } else {

360 if (smk->stream_id[smk->curstream] < 0 || !smk->bufs[smk->curstream])

361 return AVERROR_INVALIDDATA;

362 if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))

363 return AVERROR(ENOMEM);

364 memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);

365 pkt->size = smk->buf_sizes[smk->curstream];

366 pkt->stream_index = smk->stream_id[smk->curstream];

367 pkt->pts = smk->aud_pts[smk->curstream];

368 smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);

369 smk->curstream--;

370 }

371

372 return 0;

373 }

374

375 static int smacker_read_close(AVFormatContext *s)

376 {

377 SmackerContext *smk = s->priv_data;

378 int i;

379

380 for(i = 0; i < 7; i++)

381 av_freep(&smk->bufs[i]);

382 av_freep(&smk->frm_size);

383 av_freep(&smk->frm_flags);

384

385 return 0;

386 }

387

388 AVInputFormat ff_smacker_demuxer = {

389 .name = "smk",

390 .long_name = NULL_IF_CONFIG_SMALL("Smacker"),

391 .priv_data_size = sizeof(SmackerContext),

392 .read_probe = smacker_probe,

393 .read_header = smacker_read_header,

394 .read_packet = smacker_read_packet,

395 .read_close = smacker_read_close,

396 };

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