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 <inttypes.h>
27
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/intreadwrite.h"
30 #include "avformat.h"
31 #include "avio_internal.h"
32 #include "demux.h"
33 #include "internal.h"
34
35 #define SMACKER_PAL 0x01
36 #define SMACKER_FLAG_RING_FRAME 0x01
37
38 enum SAudFlags {
39 SMK_AUD_PACKED = 0x80,
40 SMK_AUD_16BITS = 0x20,
41 SMK_AUD_STEREO = 0x10,
42 SMK_AUD_BINKAUD = 0x08,
43 SMK_AUD_USEDCT = 0x04
44 };
45
46 typedef struct SmackerContext {
47 uint32_t frames;
48 /* frame info */
49 uint32_t *frm_size;
50 uint8_t *frm_flags;
51 /* internal variables */
52 int64_t next_frame_pos;
53 int cur_frame;
54 int videoindex;
55 int indexes[7];
56 int duration_size[7];
57 /* current frame for demuxing */
58 uint32_t frame_size;
59 int flags;
60 int next_audio_index;
61 int new_palette;
62 uint8_t pal[768];
63 int64_t aud_pts[7];
64 } SmackerContext;
65
66 /* palette used in Smacker */
67 static const uint8_t smk_pal[64] = {
68 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
69 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
70 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
71 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
72 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
73 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
74 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
75 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
76 };
77
78
smacker_probe(const AVProbeData *p)79 static int smacker_probe(const AVProbeData *p)
80 {
81 if ( AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '2')
82 && AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '4'))
83 return 0;
84
85 if (AV_RL32(p->buf+4) > 32768U || AV_RL32(p->buf+8) > 32768U)
86 return AVPROBE_SCORE_MAX/4;
87
88 return AVPROBE_SCORE_MAX;
89 }
90
smacker_read_header(AVFormatContext *s)91 static int smacker_read_header(AVFormatContext *s)
92 {
93 AVIOContext *pb = s->pb;
94 SmackerContext *smk = s->priv_data;
95 AVStream *st;
96 AVCodecParameters *par;
97 uint32_t magic, width, height, flags, treesize;
98 int64_t pos;
99 int i, ret, pts_inc;
100 int tbase;
101
102 /* read and check header */
103 magic = avio_rl32(pb);
104 if (magic != MKTAG('S', 'M', 'K', '2') && magic != MKTAG('S', 'M', 'K', '4'))
105 return AVERROR_INVALIDDATA;
106 width = avio_rl32(pb);
107 height = avio_rl32(pb);
108 smk->frames = avio_rl32(pb);
109 pts_inc = avio_rl32(pb);
110 if (pts_inc > INT_MAX / 100 || pts_inc == INT_MIN) {
111 av_log(s, AV_LOG_ERROR, "pts_inc %d is invalid\n", pts_inc);
112 return AVERROR_INVALIDDATA;
113 }
114
115 flags = avio_rl32(pb);
116 if (flags & SMACKER_FLAG_RING_FRAME)
117 smk->frames++;
118 if (smk->frames > 0xFFFFFF) {
119 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames);
120 return AVERROR_INVALIDDATA;
121 }
122
123 avio_skip(pb, 28); /* Unused audio related data */
124
125 treesize = avio_rl32(pb);
126 if (treesize >= UINT_MAX/4) {
127 // treesize + 16 must not overflow (this check is probably redundant)
128 av_log(s, AV_LOG_ERROR, "treesize too large\n");
129 return AVERROR_INVALIDDATA;
130 }
131
132 st = avformat_new_stream(s, NULL);
133 if (!st)
134 return AVERROR(ENOMEM);
135
136 smk->videoindex = st->index;
137 /* Smacker uses 100000 as internal timebase */
138 if (pts_inc < 0)
139 pts_inc = -pts_inc;
140 else
141 pts_inc *= 100;
142 tbase = 100000;
143 av_reduce(&tbase, &pts_inc, tbase, pts_inc, (1UL << 31) - 1);
144 avpriv_set_pts_info(st, 33, pts_inc, tbase);
145 st->duration = smk->frames;
146
147 /* init video codec */
148 par = st->codecpar;
149 par->width = width;
150 par->height = height;
151 par->format = AV_PIX_FMT_PAL8;
152 par->codec_type = AVMEDIA_TYPE_VIDEO;
153 par->codec_id = AV_CODEC_ID_SMACKVIDEO;
154 par->codec_tag = magic;
155
156 if ((ret = ff_alloc_extradata(par, treesize + 16)) < 0) {
157 av_log(s, AV_LOG_ERROR,
158 "Cannot allocate %"PRIu32" bytes of extradata\n",
159 treesize + 16);
160 return ret;
161 }
162 if ((ret = ffio_read_size(pb, par->extradata, 16)) < 0)
163 return ret;
164
165 /* handle possible audio streams */
166 for (i = 0; i < 7; i++) {
167 uint32_t rate = avio_rl24(pb);
168 uint8_t aflag = avio_r8(pb);
169
170 smk->indexes[i] = -1;
171
172 if (rate) {
173 AVStream *ast = avformat_new_stream(s, NULL);
174 AVCodecParameters *par;
175 if (!ast)
176 return AVERROR(ENOMEM);
177
178 smk->indexes[i] = ast->index;
179 par = ast->codecpar;
180 par->codec_type = AVMEDIA_TYPE_AUDIO;
181 if (aflag & SMK_AUD_BINKAUD) {
182 par->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
183 } else if (aflag & SMK_AUD_USEDCT) {
184 par->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
185 } else if (aflag & SMK_AUD_PACKED) {
186 par->codec_id = AV_CODEC_ID_SMACKAUDIO;
187 par->codec_tag = MKTAG('S', 'M', 'K', 'A');
188 } else {
189 par->codec_id = AV_CODEC_ID_PCM_U8;
190 }
191 av_channel_layout_default(&par->ch_layout,
192 !!(aflag & SMK_AUD_STEREO) + 1);
193 par->sample_rate = rate;
194 par->bits_per_coded_sample = (aflag & SMK_AUD_16BITS) ? 16 : 8;
195 if (par->bits_per_coded_sample == 16 &&
196 par->codec_id == AV_CODEC_ID_PCM_U8)
197 par->codec_id = AV_CODEC_ID_PCM_S16LE;
198 else
199 smk->duration_size[i] = 4;
200 avpriv_set_pts_info(ast, 64, 1, par->sample_rate * par->ch_layout.nb_channels
201 * par->bits_per_coded_sample / 8);
202 }
203 }
204
205 avio_rl32(pb); /* padding */
206
207 /* setup data */
208 st->priv_data = av_malloc_array(smk->frames, sizeof(*smk->frm_size) +
209 sizeof(*smk->frm_flags));
210 if (!st->priv_data)
211 return AVERROR(ENOMEM);
212 smk->frm_size = st->priv_data;
213 smk->frm_flags = (void*)(smk->frm_size + smk->frames);
214
215 /* read frame info */
216 pos = 0;
217 for (i = 0; i < smk->frames; i++) {
218 smk->frm_size[i] = avio_rl32(pb);
219 if ((ret = av_add_index_entry(st, pos, i, smk->frm_size[i], 0,
220 (i == 0 || (smk->frm_size[i] & 1)) ? AVINDEX_KEYFRAME : 0)) < 0)
221 return ret;
222 pos += smk->frm_size[i];
223 }
224 if ((ret = ffio_read_size(pb, smk->frm_flags, smk->frames)) < 0 ||
225 /* load trees to extradata, they will be unpacked by decoder */
226 (ret = ffio_read_size(pb, par->extradata + 16,
227 par->extradata_size - 16)) < 0) {
228 return ret;
229 }
230
231 return 0;
232 }
233
smacker_read_packet(AVFormatContext *s, AVPacket *pkt)234 static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
235 {
236 SmackerContext *smk = s->priv_data;
237 int flags;
238 int ret;
239
240 if (avio_feof(s->pb) || smk->cur_frame >= smk->frames)
241 return AVERROR_EOF;
242
243 /* if we demuxed all streams, pass another frame */
244 if (!smk->next_audio_index) {
245 smk->frame_size = smk->frm_size[smk->cur_frame] & (~3);
246 smk->next_frame_pos = avio_tell(s->pb) + smk->frame_size;
247 flags = smk->frm_flags[smk->cur_frame];
248 smk->flags = flags >> 1;
249 /* handle palette change event */
250 if (flags & SMACKER_PAL) {
251 int size, sz, t, off, j, pos;
252 uint8_t *pal = smk->pal;
253 uint8_t oldpal[768];
254
255 memcpy(oldpal, pal, 768);
256 size = avio_r8(s->pb);
257 size = size * 4;
258 if (size > smk->frame_size) {
259 ret = AVERROR_INVALIDDATA;
260 goto next_frame;
261 }
262 smk->frame_size -= size--;
263 sz = 0;
264 pos = avio_tell(s->pb) + size;
265 while (sz < 256) {
266 t = avio_r8(s->pb);
267 if (t & 0x80) { /* skip palette entries */
268 sz += (t & 0x7F) + 1;
269 pal += ((t & 0x7F) + 1) * 3;
270 } else if (t & 0x40) { /* copy with offset */
271 off = avio_r8(s->pb);
272 j = (t & 0x3F) + 1;
273 if (off + j > 0x100) {
274 av_log(s, AV_LOG_ERROR,
275 "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
276 off, j);
277 ret = AVERROR_INVALIDDATA;
278 goto next_frame;
279 }
280 off *= 3;
281 while (j-- && sz < 256) {
282 *pal++ = oldpal[off + 0];
283 *pal++ = oldpal[off + 1];
284 *pal++ = oldpal[off + 2];
285 sz++;
286 off += 3;
287 }
288 } else { /* new entries */
289 *pal++ = smk_pal[t];
290 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
291 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
292 sz++;
293 }
294 }
295 avio_seek(s->pb, pos, 0);
296 smk->new_palette = 1;
297 }
298 }
299
300 for (int i = smk->next_audio_index; i < 7; i++) {
301 if (smk->flags & (1 << i)) {
302 uint32_t size;
303
304 size = avio_rl32(s->pb);
305 if ((int)size < 4 + smk->duration_size[i] || size > smk->frame_size) {
306 av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
307 ret = AVERROR_INVALIDDATA;
308 goto next_frame;
309 }
310 smk->frame_size -= size;
311 size -= 4;
312
313 if (smk->indexes[i] < 0 ||
314 s->streams[smk->indexes[i]]->discard >= AVDISCARD_ALL) {
315 smk->aud_pts[i] += smk->duration_size[i] ? avio_rl32(s->pb)
316 : size;
317 avio_skip(s->pb, size - smk->duration_size[i]);
318 continue;
319 }
320 if ((ret = av_get_packet(s->pb, pkt, size)) != size) {
321 ret = ret < 0 ? ret : AVERROR_INVALIDDATA;
322 goto next_frame;
323 }
324 pkt->stream_index = smk->indexes[i];
325 pkt->pts = smk->aud_pts[i];
326 pkt->duration = smk->duration_size[i] ? AV_RL32(pkt->data)
327 : size;
328 smk->aud_pts[i] += pkt->duration;
329 smk->next_audio_index = i + 1;
330 return 0;
331 }
332 }
333
334 if (s->streams[smk->videoindex]->discard >= AVDISCARD_ALL) {
335 ret = FFERROR_REDO;
336 goto next_frame;
337 }
338 if (smk->frame_size >= INT_MAX/2) {
339 ret = AVERROR_INVALIDDATA;
340 goto next_frame;
341 }
342 if ((ret = av_new_packet(pkt, smk->frame_size + 769)) < 0)
343 goto next_frame;
344 flags = smk->new_palette;
345 if ((smk->frm_size[smk->cur_frame] & 1) || smk->cur_frame == 0)
346 flags |= 2;
347 pkt->data[0] = flags;
348 memcpy(pkt->data + 1, smk->pal, 768);
349 ret = ffio_read_size(s->pb, pkt->data + 769, smk->frame_size);
350 if (ret < 0)
351 goto next_frame;
352 pkt->stream_index = smk->videoindex;
353 pkt->pts = smk->cur_frame;
354 pkt->duration = 1;
355 if (flags & 2)
356 pkt->flags |= AV_PKT_FLAG_KEY;
357 smk->next_audio_index = 0;
358 smk->new_palette = 0;
359 smk->cur_frame++;
360
361 return 0;
362 next_frame:
363 avio_seek(s->pb, smk->next_frame_pos, SEEK_SET);
364 smk->next_audio_index = 0;
365 smk->cur_frame++;
366 return ret;
367 }
368
smacker_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)369 static int smacker_read_seek(AVFormatContext *s, int stream_index,
370 int64_t timestamp, int flags)
371 {
372 AVStream *st = s->streams[stream_index];
373 SmackerContext *smk = s->priv_data;
374 int64_t pos;
375 int ret;
376
377 if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
378 return -1;
379
380 if (timestamp < 0 || timestamp >= smk->frames)
381 return AVERROR(EINVAL);
382
383 ret = av_index_search_timestamp(st, timestamp, flags);
384 if (ret < 0)
385 return ret;
386
387 pos = ffformatcontext(s)->data_offset;
388 pos += ffstream(st)->index_entries[ret].pos;
389 pos = avio_seek(s->pb, pos, SEEK_SET);
390 if (pos < 0)
391 return pos;
392
393 smk->cur_frame = ret;
394 smk->next_audio_index = 0;
395 smk->new_palette = 0;
396 memset(smk->pal, 0, sizeof(smk->pal));
397 memset(smk->aud_pts, 0, sizeof(smk->aud_pts));
398
399 return 0;
400 }
401
402 const AVInputFormat ff_smacker_demuxer = {
403 .name = "smk",
404 .long_name = NULL_IF_CONFIG_SMALL("Smacker"),
405 .priv_data_size = sizeof(SmackerContext),
406 .read_probe = smacker_probe,
407 .read_header = smacker_read_header,
408 .read_packet = smacker_read_packet,
409 .read_seek = smacker_read_seek,
410 };
411