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smacker.c
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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"
28 #include "libavutil/intreadwrite.h"
29 #include "avformat.h"
30 #include "internal.h"
31 
32 #define SMACKER_PAL 0x01
33 #define SMACKER_FLAG_RING_FRAME 0x01
34 
35 enum SAudFlags {
41 };
42 
43 typedef struct SmackerContext {
44  /* Smacker file header */
45  uint32_t magic;
46  uint32_t width, height;
47  uint32_t frames;
48  int pts_inc;
49  uint32_t flags;
50  uint32_t audio[7];
51  uint32_t treesize;
54  uint32_t rates[7];
55  uint32_t pad;
56  /* frame info */
57  uint32_t *frm_size;
59  /* internal variables */
60  int cur_frame;
61  int is_ver4;
62  int64_t cur_pts;
63  /* current frame for demuxing */
64  uint8_t pal[768];
65  int indexes[7];
68  int buf_sizes[7];
69  int stream_id[7];
70  int curstream;
71  int64_t nextpos;
72  int64_t aud_pts[7];
74 
75 typedef struct SmackerFrame {
76  int64_t pts;
77  int stream;
78 } SmackerFrame;
79 
80 /* palette used in Smacker */
81 static const uint8_t smk_pal[64] = {
82  0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
83  0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
84  0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
85  0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
86  0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
87  0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
88  0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
89  0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
90 };
91 
92 
93 static int smacker_probe(AVProbeData *p)
94 {
95  if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K'
96  && (p->buf[3] == '2' || p->buf[3] == '4'))
97  return AVPROBE_SCORE_MAX;
98  else
99  return 0;
100 }
101 
103 {
104  AVIOContext *pb = s->pb;
105  SmackerContext *smk = s->priv_data;
106  AVStream *st, *ast[7];
107  int i, ret;
108  int tbase;
109 
110  /* read and check header */
111  smk->magic = avio_rl32(pb);
112  if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
113  return AVERROR_INVALIDDATA;
114  smk->width = avio_rl32(pb);
115  smk->height = avio_rl32(pb);
116  smk->frames = avio_rl32(pb);
117  smk->pts_inc = (int32_t)avio_rl32(pb);
118  smk->flags = avio_rl32(pb);
119  if(smk->flags & SMACKER_FLAG_RING_FRAME)
120  smk->frames++;
121  for(i = 0; i < 7; i++)
122  smk->audio[i] = avio_rl32(pb);
123  smk->treesize = avio_rl32(pb);
124 
125  if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
126  av_log(s, AV_LOG_ERROR, "treesize too large\n");
127  return AVERROR_INVALIDDATA;
128  }
129 
130 //FIXME remove extradata "rebuilding"
131  smk->mmap_size = avio_rl32(pb);
132  smk->mclr_size = avio_rl32(pb);
133  smk->full_size = avio_rl32(pb);
134  smk->type_size = avio_rl32(pb);
135  for(i = 0; i < 7; i++) {
136  smk->rates[i] = avio_rl24(pb);
137  smk->aflags[i] = avio_r8(pb);
138  }
139  smk->pad = avio_rl32(pb);
140  /* setup data */
141  if(smk->frames > 0xFFFFFF) {
142  av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames);
143  return AVERROR_INVALIDDATA;
144  }
145  smk->frm_size = av_malloc_array(smk->frames, sizeof(*smk->frm_size));
146  smk->frm_flags = av_malloc(smk->frames);
147  if (!smk->frm_size || !smk->frm_flags) {
148  av_freep(&smk->frm_size);
149  av_freep(&smk->frm_flags);
150  return AVERROR(ENOMEM);
151  }
152 
153  smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
154 
155  /* read frame info */
156  for(i = 0; i < smk->frames; i++) {
157  smk->frm_size[i] = avio_rl32(pb);
158  }
159  for(i = 0; i < smk->frames; i++) {
160  smk->frm_flags[i] = avio_r8(pb);
161  }
162 
163  /* init video codec */
164  st = avformat_new_stream(s, NULL);
165  if (!st)
166  return AVERROR(ENOMEM);
167  smk->videoindex = st->index;
168  st->codec->width = smk->width;
169  st->codec->height = smk->height;
173  st->codec->codec_tag = smk->magic;
174  /* Smacker uses 100000 as internal timebase */
175  if(smk->pts_inc < 0)
176  smk->pts_inc = -smk->pts_inc;
177  else
178  smk->pts_inc *= 100;
179  tbase = 100000;
180  av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
181  avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);
182  st->duration = smk->frames;
183  /* handle possible audio streams */
184  for(i = 0; i < 7; i++) {
185  smk->indexes[i] = -1;
186  if (smk->rates[i]) {
187  ast[i] = avformat_new_stream(s, NULL);
188  if (!ast[i])
189  return AVERROR(ENOMEM);
190  smk->indexes[i] = ast[i]->index;
192  if (smk->aflags[i] & SMK_AUD_BINKAUD) {
194  } else if (smk->aflags[i] & SMK_AUD_USEDCT) {
196  } else if (smk->aflags[i] & SMK_AUD_PACKED){
198  ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
199  } else {
200  ast[i]->codec->codec_id = AV_CODEC_ID_PCM_U8;
201  }
202  if (smk->aflags[i] & SMK_AUD_STEREO) {
203  ast[i]->codec->channels = 2;
205  } else {
206  ast[i]->codec->channels = 1;
208  }
209  ast[i]->codec->sample_rate = smk->rates[i];
210  ast[i]->codec->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
211  if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == AV_CODEC_ID_PCM_U8)
213  avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate
214  * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8);
215  }
216  }
217 
218 
219  /* load trees to extradata, they will be unpacked by decoder */
220  if(ff_alloc_extradata(st->codec, smk->treesize + 16)){
221  av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16);
222  av_freep(&smk->frm_size);
223  av_freep(&smk->frm_flags);
224  return AVERROR(ENOMEM);
225  }
226  ret = avio_read(pb, st->codec->extradata + 16, st->codec->extradata_size - 16);
227  if(ret != st->codec->extradata_size - 16){
228  av_freep(&smk->frm_size);
229  av_freep(&smk->frm_flags);
230  return AVERROR(EIO);
231  }
232  ((int32_t*)st->codec->extradata)[0] = av_le2ne32(smk->mmap_size);
233  ((int32_t*)st->codec->extradata)[1] = av_le2ne32(smk->mclr_size);
234  ((int32_t*)st->codec->extradata)[2] = av_le2ne32(smk->full_size);
235  ((int32_t*)st->codec->extradata)[3] = av_le2ne32(smk->type_size);
236 
237  smk->curstream = -1;
238  smk->nextpos = avio_tell(pb);
239 
240  return 0;
241 }
242 
243 
245 {
246  SmackerContext *smk = s->priv_data;
247  int flags;
248  int ret;
249  int i;
250  int frame_size = 0;
251  int palchange = 0;
252 
253  if (url_feof(s->pb) || smk->cur_frame >= smk->frames)
254  return AVERROR_EOF;
255 
256  /* if we demuxed all streams, pass another frame */
257  if(smk->curstream < 0) {
258  avio_seek(s->pb, smk->nextpos, 0);
259  frame_size = smk->frm_size[smk->cur_frame] & (~3);
260  flags = smk->frm_flags[smk->cur_frame];
261  /* handle palette change event */
262  if(flags & SMACKER_PAL){
263  int size, sz, t, off, j, pos;
264  uint8_t *pal = smk->pal;
265  uint8_t oldpal[768];
266 
267  memcpy(oldpal, pal, 768);
268  size = avio_r8(s->pb);
269  size = size * 4 - 1;
270  if(size + 1 > frame_size)
271  return AVERROR_INVALIDDATA;
272  frame_size -= size;
273  frame_size--;
274  sz = 0;
275  pos = avio_tell(s->pb) + size;
276  while(sz < 256){
277  t = avio_r8(s->pb);
278  if(t & 0x80){ /* skip palette entries */
279  sz += (t & 0x7F) + 1;
280  pal += ((t & 0x7F) + 1) * 3;
281  } else if(t & 0x40){ /* copy with offset */
282  off = avio_r8(s->pb);
283  j = (t & 0x3F) + 1;
284  if (off + j > 0x100) {
285  av_log(s, AV_LOG_ERROR,
286  "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
287  off, j);
288  return AVERROR_INVALIDDATA;
289  }
290  off *= 3;
291  while(j-- && sz < 256) {
292  *pal++ = oldpal[off + 0];
293  *pal++ = oldpal[off + 1];
294  *pal++ = oldpal[off + 2];
295  sz++;
296  off += 3;
297  }
298  } else { /* new entries */
299  *pal++ = smk_pal[t];
300  *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
301  *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
302  sz++;
303  }
304  }
305  avio_seek(s->pb, pos, 0);
306  palchange |= 1;
307  }
308  flags >>= 1;
309  smk->curstream = -1;
310  /* if audio chunks are present, put them to stack and retrieve later */
311  for(i = 0; i < 7; i++) {
312  if(flags & 1) {
313  uint32_t size;
314  int err;
315 
316  size = avio_rl32(s->pb) - 4;
317  if (!size || size + 4L > frame_size) {
318  av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
319  return AVERROR_INVALIDDATA;
320  }
321  frame_size -= size;
322  frame_size -= 4;
323  smk->curstream++;
324  if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0) {
325  smk->buf_sizes[smk->curstream] = 0;
326  return err;
327  }
328  smk->buf_sizes[smk->curstream] = size;
329  ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
330  if(ret != size)
331  return AVERROR(EIO);
332  smk->stream_id[smk->curstream] = smk->indexes[i];
333  }
334  flags >>= 1;
335  }
336  if (frame_size < 0 || frame_size >= INT_MAX/2)
337  return AVERROR_INVALIDDATA;
338  if (av_new_packet(pkt, frame_size + 769))
339  return AVERROR(ENOMEM);
340  if(smk->frm_size[smk->cur_frame] & 1)
341  palchange |= 2;
342  pkt->data[0] = palchange;
343  memcpy(pkt->data + 1, smk->pal, 768);
344  ret = avio_read(s->pb, pkt->data + 769, frame_size);
345  if(ret != frame_size)
346  return AVERROR(EIO);
347  pkt->stream_index = smk->videoindex;
348  pkt->pts = smk->cur_frame;
349  pkt->size = ret + 769;
350  smk->cur_frame++;
351  smk->nextpos = avio_tell(s->pb);
352  } else {
353  if (smk->stream_id[smk->curstream] < 0 || !smk->bufs[smk->curstream])
354  return AVERROR_INVALIDDATA;
355  if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
356  return AVERROR(ENOMEM);
357  memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
358  pkt->size = smk->buf_sizes[smk->curstream];
359  pkt->stream_index = smk->stream_id[smk->curstream];
360  pkt->pts = smk->aud_pts[smk->curstream];
361  smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
362  smk->curstream--;
363  }
364 
365  return 0;
366 }
367 
369 {
370  SmackerContext *smk = s->priv_data;
371  int i;
372 
373  for(i = 0; i < 7; i++)
374  av_freep(&smk->bufs[i]);
375  av_freep(&smk->frm_size);
376  av_freep(&smk->frm_flags);
377 
378  return 0;
379 }
380 
382  .name = "smk",
383  .long_name = NULL_IF_CONFIG_SMALL("Smacker"),
384  .priv_data_size = sizeof(SmackerContext),
389 };