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