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path: root/libavformat/smacker.c (plain)
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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 <inttypes.h>
27
28#include "libavutil/bswap.h"
29#include "libavutil/channel_layout.h"
30#include "libavutil/intreadwrite.h"
31#include "avformat.h"
32#include "internal.h"
33
34#define SMACKER_PAL 0x01
35#define SMACKER_FLAG_RING_FRAME 0x01
36
37enum 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
45typedef 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;
76
77typedef struct SmackerFrame {
78 int64_t pts;
79 int stream;
80} SmackerFrame;
81
82/* palette used in Smacker */
83static 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};
93
94
95static 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
107static 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 if (smk->pts_inc > INT_MAX / 100) {
124 av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", smk->pts_inc);
125 return AVERROR_INVALIDDATA;
126 }
127
128 smk->flags = avio_rl32(pb);
129 if(smk->flags & SMACKER_FLAG_RING_FRAME)
130 smk->frames++;
131 for(i = 0; i < 7; i++)
132 smk->audio[i] = avio_rl32(pb);
133 smk->treesize = avio_rl32(pb);
134
135 if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
136 av_log(s, AV_LOG_ERROR, "treesize too large\n");
137 return AVERROR_INVALIDDATA;
138 }
139
140//FIXME remove extradata "rebuilding"
141 smk->mmap_size = avio_rl32(pb);
142 smk->mclr_size = avio_rl32(pb);
143 smk->full_size = avio_rl32(pb);
144 smk->type_size = avio_rl32(pb);
145 for(i = 0; i < 7; i++) {
146 smk->rates[i] = avio_rl24(pb);
147 smk->aflags[i] = avio_r8(pb);
148 }
149 smk->pad = avio_rl32(pb);
150 /* setup data */
151 if(smk->frames > 0xFFFFFF) {
152 av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames);
153 return AVERROR_INVALIDDATA;
154 }
155 smk->frm_size = av_malloc_array(smk->frames, sizeof(*smk->frm_size));
156 smk->frm_flags = av_malloc(smk->frames);
157 if (!smk->frm_size || !smk->frm_flags) {
158 av_freep(&smk->frm_size);
159 av_freep(&smk->frm_flags);
160 return AVERROR(ENOMEM);
161 }
162
163 smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
164
165 /* read frame info */
166 for(i = 0; i < smk->frames; i++) {
167 smk->frm_size[i] = avio_rl32(pb);
168 }
169 for(i = 0; i < smk->frames; i++) {
170 smk->frm_flags[i] = avio_r8(pb);
171 }
172
173 /* init video codec */
174 st = avformat_new_stream(s, NULL);
175 if (!st)
176 return AVERROR(ENOMEM);
177 smk->videoindex = st->index;
178 st->codecpar->width = smk->width;
179 st->codecpar->height = smk->height;
180 st->codecpar->format = AV_PIX_FMT_PAL8;
181 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
182 st->codecpar->codec_id = AV_CODEC_ID_SMACKVIDEO;
183 st->codecpar->codec_tag = smk->magic;
184 /* Smacker uses 100000 as internal timebase */
185 if(smk->pts_inc < 0)
186 smk->pts_inc = -smk->pts_inc;
187 else
188 smk->pts_inc *= 100;
189 tbase = 100000;
190 av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
191 avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);
192 st->duration = smk->frames;
193 /* handle possible audio streams */
194 for(i = 0; i < 7; i++) {
195 smk->indexes[i] = -1;
196 if (smk->rates[i]) {
197 ast[i] = avformat_new_stream(s, NULL);
198 if (!ast[i])
199 return AVERROR(ENOMEM);
200 smk->indexes[i] = ast[i]->index;
201 ast[i]->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
202 if (smk->aflags[i] & SMK_AUD_BINKAUD) {
203 ast[i]->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
204 } else if (smk->aflags[i] & SMK_AUD_USEDCT) {
205 ast[i]->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
206 } else if (smk->aflags[i] & SMK_AUD_PACKED){
207 ast[i]->codecpar->codec_id = AV_CODEC_ID_SMACKAUDIO;
208 ast[i]->codecpar->codec_tag = MKTAG('S', 'M', 'K', 'A');
209 } else {
210 ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
211 }
212 if (smk->aflags[i] & SMK_AUD_STEREO) {
213 ast[i]->codecpar->channels = 2;
214 ast[i]->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
215 } else {
216 ast[i]->codecpar->channels = 1;
217 ast[i]->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
218 }
219 ast[i]->codecpar->sample_rate = smk->rates[i];
220 ast[i]->codecpar->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
221 if(ast[i]->codecpar->bits_per_coded_sample == 16 && ast[i]->codecpar->codec_id == AV_CODEC_ID_PCM_U8)
222 ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
223 avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codecpar->sample_rate
224 * ast[i]->codecpar->channels * ast[i]->codecpar->bits_per_coded_sample / 8);
225 }
226 }
227
228
229 /* load trees to extradata, they will be unpacked by decoder */
230 if(ff_alloc_extradata(st->codecpar, smk->treesize + 16)){
231 av_log(s, AV_LOG_ERROR,
232 "Cannot allocate %"PRIu32" bytes of extradata\n",
233 smk->treesize + 16);
234 av_freep(&smk->frm_size);
235 av_freep(&smk->frm_flags);
236 return AVERROR(ENOMEM);
237 }
238 ret = avio_read(pb, st->codecpar->extradata + 16, st->codecpar->extradata_size - 16);
239 if(ret != st->codecpar->extradata_size - 16){
240 av_freep(&smk->frm_size);
241 av_freep(&smk->frm_flags);
242 return AVERROR(EIO);
243 }
244 ((int32_t*)st->codecpar->extradata)[0] = av_le2ne32(smk->mmap_size);
245 ((int32_t*)st->codecpar->extradata)[1] = av_le2ne32(smk->mclr_size);
246 ((int32_t*)st->codecpar->extradata)[2] = av_le2ne32(smk->full_size);
247 ((int32_t*)st->codecpar->extradata)[3] = av_le2ne32(smk->type_size);
248
249 smk->curstream = -1;
250 smk->nextpos = avio_tell(pb);
251
252 return 0;
253}
254
255
256static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
257{
258 SmackerContext *smk = s->priv_data;
259 int flags;
260 int ret;
261 int i;
262 int frame_size = 0;
263 int palchange = 0;
264
265 if (avio_feof(s->pb) || smk->cur_frame >= smk->frames)
266 return AVERROR_EOF;
267
268 /* if we demuxed all streams, pass another frame */
269 if(smk->curstream < 0) {
270 avio_seek(s->pb, smk->nextpos, 0);
271 frame_size = smk->frm_size[smk->cur_frame] & (~3);
272 flags = smk->frm_flags[smk->cur_frame];
273 /* handle palette change event */
274 if(flags & SMACKER_PAL){
275 int size, sz, t, off, j, pos;
276 uint8_t *pal = smk->pal;
277 uint8_t oldpal[768];
278
279 memcpy(oldpal, pal, 768);
280 size = avio_r8(s->pb);
281 size = size * 4 - 1;
282 if(size + 1 > frame_size)
283 return AVERROR_INVALIDDATA;
284 frame_size -= size;
285 frame_size--;
286 sz = 0;
287 pos = avio_tell(s->pb) + size;
288 while(sz < 256){
289 t = avio_r8(s->pb);
290 if(t & 0x80){ /* skip palette entries */
291 sz += (t & 0x7F) + 1;
292 pal += ((t & 0x7F) + 1) * 3;
293 } else if(t & 0x40){ /* copy with offset */
294 off = avio_r8(s->pb);
295 j = (t & 0x3F) + 1;
296 if (off + j > 0x100) {
297 av_log(s, AV_LOG_ERROR,
298 "Invalid palette update, offset=%d length=%d extends beyond palette size\n",
299 off, j);
300 return AVERROR_INVALIDDATA;
301 }
302 off *= 3;
303 while(j-- && sz < 256) {
304 *pal++ = oldpal[off + 0];
305 *pal++ = oldpal[off + 1];
306 *pal++ = oldpal[off + 2];
307 sz++;
308 off += 3;
309 }
310 } else { /* new entries */
311 *pal++ = smk_pal[t];
312 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
313 *pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
314 sz++;
315 }
316 }
317 avio_seek(s->pb, pos, 0);
318 palchange |= 1;
319 }
320 flags >>= 1;
321 smk->curstream = -1;
322 /* if audio chunks are present, put them to stack and retrieve later */
323 for(i = 0; i < 7; i++) {
324 if(flags & 1) {
325 uint32_t size;
326 int err;
327
328 size = avio_rl32(s->pb) - 4;
329 if (!size || size + 4LL > frame_size) {
330 av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
331 return AVERROR_INVALIDDATA;
332 }
333 frame_size -= size;
334 frame_size -= 4;
335 smk->curstream++;
336 if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0) {
337 smk->buf_sizes[smk->curstream] = 0;
338 return err;
339 }
340 smk->buf_sizes[smk->curstream] = size;
341 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
342 if(ret != size)
343 return AVERROR(EIO);
344 smk->stream_id[smk->curstream] = smk->indexes[i];
345 }
346 flags >>= 1;
347 }
348 if (frame_size < 0 || frame_size >= INT_MAX/2)
349 return AVERROR_INVALIDDATA;
350 if (av_new_packet(pkt, frame_size + 769))
351 return AVERROR(ENOMEM);
352 if(smk->frm_size[smk->cur_frame] & 1)
353 palchange |= 2;
354 pkt->data[0] = palchange;
355 memcpy(pkt->data + 1, smk->pal, 768);
356 ret = avio_read(s->pb, pkt->data + 769, frame_size);
357 if(ret != frame_size)
358 return AVERROR(EIO);
359 pkt->stream_index = smk->videoindex;
360 pkt->pts = smk->cur_frame;
361 pkt->size = ret + 769;
362 smk->cur_frame++;
363 smk->nextpos = avio_tell(s->pb);
364 } else {
365 if (smk->stream_id[smk->curstream] < 0 || !smk->bufs[smk->curstream])
366 return AVERROR_INVALIDDATA;
367 if (av_new_packet(pkt, smk->buf_sizes[smk->curstream]))
368 return AVERROR(ENOMEM);
369 memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
370 pkt->size = smk->buf_sizes[smk->curstream];
371 pkt->stream_index = smk->stream_id[smk->curstream];
372 pkt->pts = smk->aud_pts[smk->curstream];
373 smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
374 smk->curstream--;
375 }
376
377 return 0;
378}
379
380static int smacker_read_close(AVFormatContext *s)
381{
382 SmackerContext *smk = s->priv_data;
383 int i;
384
385 for(i = 0; i < 7; i++)
386 av_freep(&smk->bufs[i]);
387 av_freep(&smk->frm_size);
388 av_freep(&smk->frm_flags);
389
390 return 0;
391}
392
393AVInputFormat ff_smacker_demuxer = {
394 .name = "smk",
395 .long_name = NULL_IF_CONFIG_SMALL("Smacker"),
396 .priv_data_size = sizeof(SmackerContext),
397 .read_probe = smacker_probe,
398 .read_header = smacker_read_header,
399 .read_packet = smacker_read_packet,
400 .read_close = smacker_read_close,
401};
402
generated by cgit at 2024-05-17 06:58:57 (GMT)