mp4文件解析(纯c解析代码)
程序员文章站
2022-06-01 08:52:05
1 #include 2 #include 3 #include 4 5 #define PRINTF_DEBUG 6 7 #define BOX_TYPE_FTYPE "ftyp" 8 #define BOX_TYPE_MOOV "m ......
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4
5 #define printf_debug
6
7 #define box_type_ftype "ftyp"
8 #define box_type_moov "moov"
9 #define box_type_mvhd "mvhd"
10 #define box_type_trak "trak"
11 #define box_type_tkhd "tkhd"
12 #define box_type_edts "edts"
13 #define box_type_mdia "mdia"
14 #define box_type_mdhd "mdhd"
15 #define box_type_hdlr "hdlr"
16 #define box_type_minf "minf"
17 #define box_type_vmhd "vmhd"
18 #define box_type_dinf "dinf"
19 #define box_type_dref "dref"
20 #define box_type_stbl "stbl"
21 #define box_type_stsd "stsd"
22 #define box_type_stts "stts"
23 #define box_type_stss "stss"
24 #define box_type_stsc "stsc"
25 #define box_type_stsz "stsz"
26 #define box_type_stco "stco"
27 #define box_type_udta "udta"
28
29 #define max_box_size_len 4
30 #define max_box_type_len 4
31 #define max_handler_type_len 4
32 #define max_ftyp_brabds_len 4
33 #define max_ftyp_brabds_num 4
34 #define max_stts_entry_num 8
35 #define max_stss_entry_num 8
36 #define max_stsc_entry_num 100
37 #define max_stsz_entry_num 100 /* now parse 100 frame */
38 #define max_stco_entry_num 100
39 #define max_mvhd_reserved_len 10
40 #define max_pre_define_len 24
41 #define max_matrix_len 36
42 #define max_hdlr_name_len 100
43
44
45 typedef struct t_box_header
46 {
47 int boxsize;
48
49 unsigned char boxtype[max_box_type_len+1];
50
51 long largeboxsize; /* if boxsize=1 use, if boxsize=0, end of file */
52 } t_box_header;
53
54 /********************************************************************************************
55 ** file type box (ftyp): file type, 表明文件类型
56 **
57 --------------------------------------------------------------------------------------------
58 ** 字段名称 | 长度(bytes) | 有关描述
59 --------------------------------------------------------------------------------------------
60 ** boxsize | 4 | box的长度
61 ** boxtype | 4 | box的类型
62 ** major_brand | 4 |
63 ** minor_version | 4 | 版本号
64 ** compatible_brands | 4 * n | 本文件遵从的多种协议(ismo, iso2, mp41)
65 ********************************************************************************************/
66 typedef struct t_box4ftyp_brand
67 {
68 unsigned char brands[max_ftyp_brabds_len+1];
69 } t_box4ftyp_bran;
70
71 typedef struct t_box4ftyp
72 {
73 unsigned char major_brand[max_ftyp_brabds_len+1];
74
75 int minor_version;
76
77 t_box4ftyp_bran compatible_brands[max_ftyp_brabds_num];
78 } t_box4ftyp;
79
80 /************************************************************************************************************
81 ** mvhd: movie header, 文件的总体信息: 时长, 创建时间等
82 **
83 --------------------------------------------------------------------------------------------
84 ** 字段名称 | 长度(bytes) | 有关描述
85 --------------------------------------------------------------------------------------------
86 ** boxsize | 4 | box的长度
87 ** boxtype | 4 | box的类型
88 ** version | 1 | box版本，0或1，一般为0（以下字节数均按version = 0）
89 ** flags | 3 |
90 ** creation time | 4 | 创建时间（相对于utc时间1904 - 01 - 01零点的秒数）
91 ** modification time | 4 | 修改时间
92 ** time scale | 4 | 文件媒体在1秒时间内的刻度值，可以理解为1秒长度的时间单元数
93 ** duration | 4 | 该track的时间长度，用duration和time scale值可以计算track时长
94 ** rate | 4 | 推荐播放速率，高16位和低16位分别为小数点整数部分和小数部分，即[16.16] 格式.该值为1.0 (0x00010000)
95 ** volume | 2 | 与rate类似，[8.8] 格式，1.0（0x0100）表示最大音量
96 ** reserved | 10 | 保留位
97 ** matrix | 36 | 视频变换矩阵
98 ** pre-defined | 24 |
99 ** next track id | 4 | 下一个track使用的id号
100 **
101 if (version==1)
102 {
103 unsigned int(64) creation_time;
104 unsigned int(64) modification_time;
105 unsigned int(32) timescale;
106 unsigned int(64) duration;
107 }
108 else
109 {
110 unsigned int(32) creation_time;
111 unsigned int(32) modification_time;
112 unsigned int(32) timescale;
113 unsigned int(32) duration;
114 }
115 ************************************************************************************************************/
116 typedef struct t_box4mvhd
117 {
118 int creation_time;
119 int modification_time;
120 int timescale;
121 int duration;
122 float rate;
123 float volume;
124 int next_track_id;
125 } t_box4mvhd;
126
127 /************************************************************************************************************
128 ** tkhd: track header, track的总体信息, 如时长, 宽高等
129 **
130 -------------------------------------------------------------------------------------------------------------
131 ** 字段名称 | 长度(bytes) | 有关描述
132 -------------------------------------------------------------------------------------------------------------
133 ** boxsize | 4 | box的长度
134 ** boxtype | 4 | box的类型
135 ** version | 1 | box版本，0或1，一般为0。（以下字节数均按version = 0）
136 ** flags | 3 | 按位或操作结果值，预定义如下;
137 0x000001 track_enabled，否则该track不被播放；
138 0x000002 track_in_movie，表示该track在播放中被引用；
139 0x000004 track_in_preview，表示该track在预览时被引用。
140 一般该值为7，如果一个媒体所有track均未设置track_in_movie和track_in_preview,将被理解为所有track均设置了这两项;
141 对于hint track，该值为0;
142 ** creation_time | 4 | 创建时间（相对于utc时间1904 - 01 - 01零点的秒数）
143 ** modification_time | 4 | 修改时间
144 ** track_id | 4 | id号 不能重复且不能为0
145 ** reserved | 4 | 保留位
146 ** duration | 4 | track的时间长度
147 ** reserved | 8 | 保留位
148 ** layer | 2 | 视频层，默认为0，值小的在上层
149 ** alternate_group | 2 | track分组信息，默认为0表示该track未与其他track有群组关系
150 ** volume | 2 | [8.8] 格式，如果为音频track，1.0（0x0100）表示最大音量；否则为0
151 ** reserved | 2 | 保留位
152 ** matrix | 36 | 视频变换矩阵
153 ** width | 4 | 宽
154 ** height | 4 | 高，均为[16.16] 格式值 与sample描述中的实际画面大小比值，用于播放时的展示宽高
155 if (version==1)
156 {
157 unsigned int(64) creation_time;
158 unsigned int(64) modification_time;
159 unsigned int(32) track_id;
160 const unsigned int(32) reserved = 0;
161 unsigned int(64) duration;
162 }
163 else
164 {
165 unsigned int(32) creation_time;
166 unsigned int(32) modification_time;
167 unsigned int(32) track_id;
168 const unsigned int(32) reserved = 0;
169 unsigned int(32) duration;
170 }
171 ************************************************************************************************************/
172 typedef struct t_box4tkhd
173 {
174 int flags;
175 int creation_time;
176 int modification_time;
177 int track_id;
178 int duration;
179 int layer;
180 int alternate_group;
181 float volume;
182 float width;
183 float height;
184 } t_box4tkhd;
185
186 /************************************************************************************************************
187 ** mdhd: 包含了了该track的总体信息, mdhd和tkhd 内容大致都是一样的.
188 **
189 -------------------------------------------------------------------------------------------------------------
190 ** 字段名称 | 长度(bytes) | 有关描述
191 -------------------------------------------------------------------------------------------------------------
192 ** boxsize | 4 | box的长度
193 ** boxtype | 4 | box的类型
194 ** version | 1 | box版本0或1 一般为0 (以下字节数均按version=0)
195 ** flags | 3 |
196 ** creation_time | 4 | 创建时间（相对于utc时间1904 - 01 - 01零点的秒数）
197 ** modification_time | 4 | 修改时间
198 ** time_scale | 4 |
199 ** duration | 4 | track的时间长度
200 ** language | 2 | 媒体语言码,最高位为0 后面15位为3个字符[见iso 639-2/t标准中定义]
201 ** pre-defined | 2 | 保留位
202
203 ** tkhd通常是对指定的track设定相关属性和内容, 而mdhd是针对于独立的media来设置的, 一般情况下二者相同.
204 ************************************************************************************************************/
205 typedef struct t_box4mdhd
206 {
207 int creation_time;
208 int modification_time;
209 int timescale;
210 int duration;
211 short language;
212 } t_box4mdhd;
213
214 /************************************************************************************************************
215 ** hdlr: handler reference box, 媒体的播放过程信息, 该box也可以被包含在meta box(meta)中
216 **
217 -------------------------------------------------------------------------------------------------------------
218 ** 字段名称 | 长度(bytes) | 有关描述
219 -------------------------------------------------------------------------------------------------------------
220 ** boxsize | 4 | box的长度
221 ** boxtype | 4 | box的类型
222 ** version | 1 | box版本0或1 一般为0 (以下字节数均按version=0)
223 ** flags | 3 |
224 ** pre-defined | 4 |
225 ** handler type | 4 | 在media box中，该值为4个字符
226 "vide"— video track
227 "soun"— audio track
228 "hint"— hint track
229 ** reserved | 12 |
230 ** name | 不定 | track type name，以‘\0’结尾的字符串
231 ************************************************************************************************************/
232 typedef struct t_box4hdlr
233 {
234 unsigned char handler_type[max_handler_type_len+1];
235 unsigned char name[max_hdlr_name_len+1];
236 } t_box4hdlr;
237
238 /************************************************************************************************************
239 ** vmhd: video media header box
240 **
241 -------------------------------------------------------------------------------------------------------------
242 ** 字段名称 | 长度(bytes) | 有关描述
243 -------------------------------------------------------------------------------------------------------------
244 ** boxsize | 4 | box的长度
245 ** boxtype | 4 | box的类型
246 ** version | 1 | box版本0或1 一般为0 (以下字节数均按version=0)
247 ** flags | 3 |
248 ** graphics_mode | 4 | 视频合成模式，为0时拷贝原始图像，否则与opcolor进行合成
249 ** opcolor | 2 ×3 | ｛red，green，blue｝
250
251 "vide"—vmhd 视频
252 "soun"— smhd 音频
253 "hint"—hmhd 忽略
254 ************************************************************************************************************/
255 typedef struct t_box4vmhd
256 {
257 int graphics_mode;
258 } t_box4vmhd;
259
260 /************************************************************************************************************
261 ** dref: data reference box
262 **
263 -------------------------------------------------------------------------------------------------------------
264 ** 字段名称 | 长度(bytes) | 有关描述
265 -------------------------------------------------------------------------------------------------------------
266 ** boxsize | 4 | box的长度
267 ** boxtype | 4 | box的类型
268 ** version | 1 | box版本0或1 一般为0 (以下字节数均按version=0)
269 ** flags | 3 |
270 ** entry count | 4 | "url"或"urn"表的元素个数
271 ** "url"或"urn"列表 | 不定 |
272
273 ** "dref"下会包含若干个"url"或"urn", 这些box组成一个表, 用来定位track数据. 简单的说, track可以被分成若干段,
274 每一段都可以根据"url"或"urn"指向的地址来获取数据, sample描述中会用这些片段的序号将这些片段组成一个完整的track.
275 一般情况下, 当数据被完全包含在文件中时, "url"或"urn"中的定位字符串是空的.
276 ************************************************************************************************************/
277 typedef struct t_box4dref
278 {
279 int entry_count;
280 } t_box4dref;
281
282 /************************************************************************************************************
283 ** stsd: sample description box
284 **
285 -------------------------------------------------------------------------------------------------------------
286 ** 字段名称 | 长度(bytes) | 有关描述
287 -------------------------------------------------------------------------------------------------------------
288 ** boxsize | 4 | box的长度
289 ** boxtype | 4 | box的类型
290 ** version | 1 | box版本0或1 一般为0 (以下字节数均按version=0)
291 ** entry count | 4 | "url"或"urn"表的元素个数
292
293 ** box header和version字段后会有一个entry count字段, 根据entry的个数, 每个entry会有type信息, 如"vide", "sund"等,
294 根据type不同sample description会提供不同的信息, 例如对于video track, 会有"visualsampleentry"类型信息,
295 对于audio track会有"audiosampleentry"类型信息. 视频的编码类型, 宽高, 长度, 音频的声道, 采样等信息都会出现在这个box中
296 ************************************************************************************************************/
297 typedef struct t_box4stsd
298 {
299 int entry_count;
300
301 //todo
302 } t_box4stsd;
303
304 /************************************************************************************************************
305 ** stts: time to sample box
306 **
307 -------------------------------------------------------------------------------------------------------------
308 ** 字段名称 | 长度(bytes) | 有关描述
309 -------------------------------------------------------------------------------------------------------------
310 ** boxsize | 4 | box的长度
311 ** boxtype | 4 | box的类型
312 ** version | 1 | box版本，0或1，一般为0（以下字节数均按version = 0）
313 ** flags | 3 |
314 ** entry count | 4 | sample_count和sample_delta的个数
315 ** sample_count | 4 |
316 ** sample_delta | 4 |
317
318 ** "stts”"存储了sample的duration, 描述了sample时序的映射方法, 我们通过它可以找到任何时间的sample. "stts"可以
319 包含一个压缩的表来映射时间和sample序号, 用其他的表来提供每个sample的长度和指针. 表中每个条目提供了在同一个
320 时间偏移量里面连续的sample序号, 以及samples的偏移量. 递增这些偏移量, 就可以建立一个完整的time to sample表.
321
322 例: 说明该视频包含87帧数据(sample_count), 每帧包含512个采样(sample_delta). 总共512*87=44544个采样,
323 和我们前面mdhd box的duration完全一致。
324 duration/timescale = 44544/12288 = 3.625s, 正是我们的视频播放长度.
325 12288/512 = 24 p/s (帧率)
326 ************************************************************************************************************/
327 typedef struct t_box4stts_entry
328 {
329 int sample_count;
330 int sample_delta;
331 } t_box4stts_entry;
332
333 typedef struct t_box4stts
334 {
335 int entry_count;
336
337 t_box4stts_entry entrys[max_stts_entry_num];
338 } t_box4stts;
339
340 /************************************************************************************************************
341 ** stss: sync sample box
342 **
343 -------------------------------------------------------------------------------------------------------------
344 ** 字段名称 | 长度(bytes) | 有关描述
345 -------------------------------------------------------------------------------------------------------------
346 ** boxsize | 4 | box的长度
347 ** boxtype | 4 | box的类型
348 ** version | 1 | box版本，0或1，一般为0（以下字节数均按version = 0）
349 ** flags | 3 |
350 ** entry count | 4 | sample_num的个数
351 ** sample_num | 4 |
352
353 ** "stss"确定media中的关键帧. 对于压缩媒体数据, 关键帧是一系列压缩序列的开始帧, 其解压缩时不依赖以前的帧,
354 而后续帧的解压缩将依赖于这个关键帧. "stss"可以非常紧凑的标记媒体内的随机存取点, 它包含一个sample序号表,
355 表内的每一项严格按照sample的序号排列, 说明了媒体中的哪一个sample是关键帧. 如果此表不存在, 说明每一个sample
356 都是一个关键帧, 是一个随机存取点.
357 ************************************************************************************************************/
358 typedef struct t_box4stss_entry
359 {
360 int sample_num;
361 } t_box4stss_entry;
362
363 typedef struct t_box4stss
364 {
365 int entry_count;
366
367 t_box4stss_entry entrys[max_stss_entry_num];
368 } t_box4stss;
369
370 /************************************************************************************************************
371 ** stsc: sample to chunk box
372 **
373 -------------------------------------------------------------------------------------------------------------
374 ** 字段名称 | 长度(bytes) | 有关描述
375 -------------------------------------------------------------------------------------------------------------
376 ** boxsize | 4 | box的长度
377 ** boxtype | 4 | box的类型
378 ** version | 1 | box版本，0或1，一般为0（以下字节数均按version = 0）
379 ** flags | 3 |
380 ** entry count | 4 | entry的个数
381 ** first_chunk | 4 |
382 ** samples_per_chunk | 4 |
383 ** sample_des_index | 4 |
384
385 ** 用chunk组织sample可以方便优化数据获取, 一个thunk包含一个或多个sample. "stsc"中用一个表描述了sample与chunk的映射关系,
386 查看这张表就可以找到包含指定sample的thunk, 从而找到这个sample.
387 ************************************************************************************************************/
388 typedef struct t_box4stsc_entry
389 {
390 int first_chunk;
391 int samples_per_chunk;
392 int sample_description_index;
393 } t_box4stsc_entry;
394
395 typedef struct t_box4stsc
396 {
397 int entry_count;
398
399 t_box4stsc_entry entrys[max_stsc_entry_num];
400 } t_box4stsc;
401
402 /************************************************************************************************************
403 ** stsz: sample to chunk box
404 **
405 -------------------------------------------------------------------------------------------------------------
406 ** 字段名称 | 长度(bytes) | 有关描述
407 -------------------------------------------------------------------------------------------------------------
408 ** boxsize | 4 | box的长度
409 ** boxtype | 4 | box的类型
410 ** version | 1 | box版本，0或1，一般为0（以下字节数均按version = 0）
411 ** flags | 3 |
412 ** sample_size | 4 |
413 ** sample_count | 4 | entry的个数
414 ** entry_size | 4 |
415
416 ** "stsz"定义了每个sample的大小, 包含了媒体中全部sample的数目和一张给出每个sample大小的表. 这个box相对来说体积是比较大的.
417 ************************************************************************************************************/
418 typedef struct t_box4stsz_entry
419 {
420 int entry_size;
421 } t_box4stsz_entry;
422
423 typedef struct t_box4stsz
424 {
425 int sample_size;
426 int sample_count;
427
428 t_box4stsz_entry entrys[max_stsz_entry_num];
429 } t_box4stsz;
430
431 /************************************************************************************************************
432 ** stco: chunk offset box
433 **
434 -------------------------------------------------------------------------------------------------------------
435 ** 字段名称 | 长度(bytes) | 有关描述
436 -------------------------------------------------------------------------------------------------------------
437 ** boxsize | 4 | box的长度
438 ** boxtype | 4 | box的类型
439 ** version | 1 | box版本，0或1，一般为0（以下字节数均按version = 0）
440 ** flags | 3 |
441 ** entry_count | 4 |
442 ** chunk_offset | 4 |
443
444 ** "stco"定义了每个thunk在媒体流中的位置, sample的偏移可以根据其他box推算出来. 位置有两种可能, 32位的和64位的,
445 后者对非常大的电影很有用. 在一个表中只会有一种可能, 这个位置是在整个文件中的, 而不是在任何box中的.
446 这样做就可以直接在文件中找到媒体数据, 而不用解释box. 需要注意的是一旦前面的box有了任何改变, 这张表都要重新建立, 因为位置信息已经改变了.
447 ************************************************************************************************************/
448 typedef struct t_box4stco_entry
449 {
450 int chunk_offset;
451 } t_box4stco_entry;
452
453 typedef struct t_box4stco
454 {
455 int entry_count;
456
457 t_box4stco_entry entrys[max_stco_entry_num];
458 } t_box4stco;
459
460 typedef struct t_box
461 {
462 t_box_header boxheader;
463
464 unsigned char *boxdata;
465 } t_box;
466
467 static void dealbox4ftyp(const t_box *box)
468 {
469 int i = 0;
470 int j = 0;
471 int brandsnum = 0;
472
473 t_box4ftyp box4ftyp = {0};
474
475 memset(&box4ftyp, 0x0, sizeof(t_box4ftyp));
476
477 memcpy(box4ftyp.major_brand, box->boxdata, 4);
478 box4ftyp.major_brand[max_ftyp_brabds_len] = '\0';
479
480 box4ftyp.minor_version = box->boxdata[4] << 24 | box->boxdata[5] << 16 | box->boxdata[6] << 8 | box->boxdata[7];
481
482 brandsnum = (box->boxheader.boxsize - max_box_size_len - max_box_type_len - max_ftyp_brabds_len - 4) / 4;
483
484 /* 1. if not have '\0', 每个brands的内存是连续的, 导致打印时后面的每4个数据都会加到前面;
485 2. unsigned char brands[max_ftyp_brabds_len+1]; 可解决, 此时也不必加'\0', 但需初始化;
486 3. 因此字符串最好定义+1并赋'\0';
487 4. 复现: unsigned char brands[max_ftyp_brabds_len]
488 */
489 for (i=0; i<brandsnum; i++)
490 {
491 memcpy(box4ftyp.compatible_brands[i].brands, box->boxdata+max_ftyp_brabds_len+4+4*i, 4);
492
493 box4ftyp.compatible_brands[i].brands[max_ftyp_brabds_len] = '\0';
494 }
495
496 #ifdef printf_debug
497 printf("\tmajor_brand: %s, minor_version: %d, compatible_brands: ", box4ftyp.major_brand, box4ftyp.minor_version);
498
499 for (i=0; i<brandsnum; i++)
500 {
501 if (i==brandsnum-1)
502 {
503 printf("%s", box4ftyp.compatible_brands[i].brands);
504 }
505 else
506 {
507 printf("%s,", box4ftyp.compatible_brands[i].brands);
508 }
509 }
510
511 printf("\n");
512 #endif
513 }
514
515 static void dealbox4mvhd(const unsigned char *mvhddata)
516 {
517 unsigned char *data = null;
518
519 t_box4mvhd box4mvhd = {0};
520
521 memset(&box4mvhd, 0x0, sizeof(t_box4mvhd));
522
523 data = (unsigned char *)mvhddata;
524
525 data += 4;
526 box4mvhd.creation_time = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
527
528 data += 4;
529 box4mvhd.modification_time = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
530
531 data += 4;
532 box4mvhd.timescale = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
533
534 data += 4;
535 box4mvhd.duration = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
536
537 data += 4;
538 //box4mvhd.rate = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
539 box4mvhd.rate = (data[0] << 8 | data[1]) + (data[2] << 8 | data[3]);
540
541 data += 4;
542 //box4mvhd.volume = data[0] << 8 | data[1];
543 box4mvhd.volume = data[0] + data[1];
544
545 data += 2;
546 data += (max_mvhd_reserved_len + max_pre_define_len + max_matrix_len);
547 box4mvhd.next_track_id = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
548
549 #ifdef printf_debug
550 printf("\t\tcreation_time: %d, modification_time: %d, timescale: %d, duration: %d, rate: %f, volume: %f, next_track_id: %d\n",
551 box4mvhd.creation_time, box4mvhd.modification_time, box4mvhd.timescale, box4mvhd.duration, box4mvhd.rate, box4mvhd.volume, box4mvhd.next_track_id);
552 #endif
553 }
554
555 static void dealbox4tkhd(const unsigned char *tkhddata)
556 {
557 unsigned char *data = null;
558
559 t_box4tkhd box4tkhd = {0};
560
561 memset(&box4tkhd, 0x0, sizeof(box4tkhd));
562
563 data = (unsigned char *)tkhddata;
564
565 box4tkhd.flags = data[1] << 16 | data[2] << 8 | data[3];
566
567 data += 4;
568 box4tkhd.creation_time = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
569
570 data += 4;
571 box4tkhd.modification_time = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
572
573 data += 4;
574 box4tkhd.track_id = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
575
576 data += 4;
577
578 data += 4; /* 4 reserved */
579 box4tkhd.duration = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
580
581 data += 4;
582
583 data += 8; /* 8 reserved */
584 box4tkhd.layer = data[0] << 8 | data[1];
585
586 data += 2;
587 box4tkhd.alternate_group = data[0] << 8 | data[1];
588
589 data += 2;
590 box4tkhd.volume = data[0] + data[1];
591
592 data += 2;
593
594 data += 2;
595
596 data += 36;
597 box4tkhd.width = (data[0] << 8 | data[1]) + (data[2] << 8 | data[3]);
598
599 data += 4;
600 box4tkhd.height = (data[0] << 8 | data[1]) + (data[2] << 8 | data[3]);
601
602 #ifdef printf_debug
603 printf("\t\t\tflags: %d, creation_time: %d, modification_time: %d, track_id: %d, duration: %d, layer: %d, alternate_group: %d, volume: %f, width: %f, height: %f\n",
604 box4tkhd.flags, box4tkhd.creation_time, box4tkhd.modification_time, box4tkhd.track_id, box4tkhd.duration, box4tkhd.layer, box4tkhd.alternate_group, box4tkhd.volume, box4tkhd.width, box4tkhd.height);
605 #endif
606 }
607
608 static void dealbox4dref(const t_box *box)
609 {
610 // todo
611 }
612
613 static void dealbox4dinf(const t_box *box)
614 { int boxsize = 0;
615 int dinfdatasize = 0;
616
617 unsigned char *dinfdata = null;
618 unsigned char *data = null;
619
620 char boxtype[max_box_type_len+1] = {0};
621
622 t_box drefbox = {0};
623
624 dinfdata = box->boxdata;
625 dinfdatasize = box->boxheader.boxsize-max_box_size_len-max_box_type_len;
626
627 while (dinfdatasize > 0)
628 {
629 boxsize = dinfdata[0] << 24 | dinfdata[1] << 16 | dinfdata[2] << 8 | dinfdata[3];
630
631 memcpy(boxtype, dinfdata+max_box_size_len, 4);
632
633 #ifdef printf_debug
634 printf("\t\t\t\t\t****box: layer6****\n");
635 printf("\t\t\t\t\t\tsize: %d\n", boxsize);
636 printf("\t\t\t\t\t\ttype: %s\n", boxtype);
637 #endif
638 if (0 == strcmp(boxtype, box_type_dref))
639 {
640 memset(&drefbox, 0x0, sizeof(t_box));
641
642 drefbox.boxheader.boxsize = boxsize;
643
644 memcpy(drefbox.boxheader.boxtype, boxtype, strlen(boxtype));
645
646 drefbox.boxdata = (unsigned char*)malloc(boxsize);
647 if (drefbox.boxdata)
648 {
649 memcpy(drefbox.boxdata, dinfdata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
650
651 dealbox4dref((const t_box*)&drefbox);
652
653 free(drefbox.boxdata);
654 drefbox.boxdata = null;
655 }
656 }
657
658 dinfdata += boxsize;
659 dinfdatasize -= boxsize;
660 }
661 }
662
663 static void dealbox4stts(const unsigned char *sttsdata)
664 {
665 int i = 0;
666
667 unsigned char *data = null;
668
669 t_box4stts box4stts = {0};
670
671 memset(&box4stts, 0x0, sizeof(box4stts));
672
673 data = (unsigned char *)sttsdata;
674
675 data += 4;
676
677 box4stts.entry_count = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
678
679 data += 4;
680
681 for (i=0; i<box4stts.entry_count; i++)
682 {
683 if (i == max_stts_entry_num)
684 {
685 break;
686 }
687
688 box4stts.entrys[i].sample_count = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
689
690 data += 4;
691
692 box4stts.entrys[i].sample_delta = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
693
694 data += 4;
695 }
696
697 #ifdef printf_debug
698 printf("\t\t\tentry_count: %d, [sample_count, sample_delta]: ", box4stts.entry_count);
699
700 if (box4stts.entry_count>max_stts_entry_num)
701 {
702 box4stts.entry_count = max_stts_entry_num;
703 }
704
705 for (i=0; i<box4stts.entry_count; i++)
706 {
707 if (i>0)
708 {
709 printf(", ");
710 }
711
712 printf("[%d, %d]", box4stts.entrys[i].sample_count, box4stts.entrys[i].sample_delta);
713 }
714
715 if (box4stts.entry_count==max_stts_entry_num)
716 {
717 printf("...(just show %d now)", max_stts_entry_num);
718 }
719
720 printf("\n");
721 #endif
722 }
723
724 static void dealbox4stss(const unsigned char *stssdata)
725 {
726 int i = 0;
727
728 unsigned char *data = null;
729
730 t_box4stss box4stss = {0};
731
732 memset(&box4stss, 0x0, sizeof(box4stss));
733
734 data = (unsigned char *)stssdata;
735
736 data += 4;
737
738 box4stss.entry_count = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
739
740 data += 4;
741
742 for (i=0; i<box4stss.entry_count; i++)
743 {
744 if (i == max_stss_entry_num)
745 {
746 break;
747 }
748
749 box4stss.entrys[i].sample_num = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
750
751 data += 4;
752 }
753
754 #ifdef printf_debug
755 printf("\t\t\tentry_count: %d, sample_num: ", box4stss.entry_count);
756
757 if (box4stss.entry_count>max_stss_entry_num)
758 {
759 box4stss.entry_count = max_stss_entry_num;
760 }
761
762 for (i=0; i<box4stss.entry_count; i++)
763 {
764 if (i>0)
765 {
766 printf(", ");
767 }
768
769 printf("%d", box4stss.entrys[i].sample_num);
770 }
771
772 if (box4stss.entry_count==max_stss_entry_num)
773 {
774 printf("...(just show %d now)", max_stss_entry_num);
775 }
776
777 printf("\n");
778 #endif
779 }
780
781 static void dealbox4stsc(const unsigned char *stscdata)
782 {
783 int i = 0;
784
785 unsigned char *data = null;
786
787 t_box4stsc box4stsc = {0};
788
789 memset(&box4stsc, 0x0, sizeof(box4stsc));
790
791 data = (unsigned char *)stscdata;
792
793 data += 4;
794
795 box4stsc.entry_count = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
796
797 data += 4;
798
799 for (i=0; i<box4stsc.entry_count; i++)
800 {
801 if (i == max_stsc_entry_num)
802 {
803 break;
804 }
805
806 box4stsc.entrys[i].first_chunk = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
807
808 data += 4;
809
810 box4stsc.entrys[i].samples_per_chunk = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
811
812 data += 4;
813
814 box4stsc.entrys[i].sample_description_index = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
815
816 data += 4;
817 }
818
819 #ifdef printf_debug
820 printf("\t\t\tentry_count: %d, [first_chunk, samples_per_chunk, sample_description_index]: ", box4stsc.entry_count);
821
822 if (box4stsc.entry_count>max_stsc_entry_num)
823 {
824 box4stsc.entry_count = max_stsc_entry_num;
825 }
826
827 for (i=0; i<box4stsc.entry_count; i++)
828 {
829 if (i>0)
830 {
831 printf(", ");
832 }
833
834 printf("[%d, %d, %d]", box4stsc.entrys[i].first_chunk, box4stsc.entrys[i].samples_per_chunk, box4stsc.entrys[i].sample_description_index);
835 }
836
837 if (box4stsc.entry_count==max_stsc_entry_num)
838 {
839 printf("...(just show %d now)", max_stsc_entry_num);
840 }
841
842 printf("\n");
843 #endif
844 }
845
846 static void dealbox4stsz(const unsigned char *stszdata)
847 {
848 int i = 0;
849
850 unsigned char *data = null;
851
852 t_box4stsz box4stsz = {0};
853
854 memset(&box4stsz, 0x0, sizeof(box4stsz));
855
856 data = (unsigned char *)stszdata;
857
858 data += 4;
859
860 box4stsz.sample_size = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
861
862 data += 4;
863
864 box4stsz.sample_count = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
865
866 data += 4;
867
868 for (i=0; i<box4stsz.sample_count; i++)
869 {
870 if (i == max_stsz_entry_num)
871 {
872 break;
873 }
874
875 box4stsz.entrys[i].entry_size = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
876
877 data += 4;
878 }
879
880 #ifdef printf_debug
881 printf("\t\t\tsample_size: %d, sample_count: %d, [entry_size]: ", box4stsz.sample_size, box4stsz.sample_count);
882
883 if (box4stsz.sample_count>max_stsz_entry_num)
884 {
885 box4stsz.sample_count = max_stsz_entry_num;
886 }
887
888 for (i=0; i<box4stsz.sample_count; i++)
889 {
890 if (i>0)
891 {
892 printf(", ");
893 }
894
895 printf("[%d]", box4stsz.entrys[i].entry_size);
896 }
897
898 if (box4stsz.sample_count==max_stsz_entry_num)
899 {
900 printf("...(just show %d now)", max_stsz_entry_num);
901 }
902
903 printf("\n");
904 #endif
905 }
906
907 static void dealbox4stco(const unsigned char *stcodata)
908 {
909 int i = 0;
910
911 unsigned char *data = null;
912
913 t_box4stco box4stco = {0};
914
915 memset(&box4stco, 0x0, sizeof(box4stco));
916
917 data = (unsigned char *)stcodata;
918
919 data += 4;
920
921 box4stco.entry_count = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
922
923 data += 4;
924
925 for (i=0; i<box4stco.entry_count; i++)
926 {
927 if (i == max_stco_entry_num)
928 {
929 break;
930 }
931
932 box4stco.entrys[i].chunk_offset = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
933
934 data += 4;
935 }
936
937 #ifdef printf_debug
938 printf("\t\t\entry_count: %d, [chunk_offset]: ", box4stco.entry_count);
939
940 if (box4stco.entry_count>max_stco_entry_num)
941 {
942 box4stco.entry_count = max_stco_entry_num;
943 }
944
945 for (i=0; i<box4stco.entry_count; i++)
946 {
947 if (i>0)
948 {
949 printf(", ");
950 }
951
952 printf("[%d]", box4stco.entrys[i].chunk_offset);
953 }
954
955 if (box4stco.entry_count==max_stco_entry_num)
956 {
957 printf("...(just show %d now)", max_stco_entry_num);
958 }
959
960 printf("\n");
961 #endif
962 }
963
964 static void dealbox4stbl(const t_box *box)
965 {
966 int boxsize = 0;
967 int stbldatasize = 0;
968
969 unsigned char *stbldata = null;
970 unsigned char *data = null;
971
972 char boxtype[max_box_type_len+1] = {0};
973
974 stbldata = box->boxdata;
975 stbldatasize = box->boxheader.boxsize-max_box_size_len-max_box_type_len;
976
977 while (stbldatasize > 0)
978 {
979 boxsize = stbldata[0] << 24 | stbldata[1] << 16 | stbldata[2] << 8 | stbldata[3];
980
981 memcpy(boxtype, stbldata+max_box_size_len, 4);
982
983 #ifdef printf_debug
984 printf("\t\t\t\t\t****box: layer6****\n");
985 printf("\t\t\t\t\t\tsize: %d\n", boxsize);
986 printf("\t\t\t\t\t\ttype: %s\n", boxtype);
987 #endif
988
989 if (0 == strcmp(boxtype, box_type_stts))
990 {
991 data = (unsigned char*)malloc(boxsize);
992 if (data)
993 {
994 memcpy(data, stbldata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
995
996 dealbox4stts(data);
997
998 free(data);
999 data = null;
1000 }
1001 }
1002 else if (0 == strcmp(boxtype, box_type_stss))
1003 {
1004 data = (unsigned char*)malloc(boxsize);
1005 if (data)
1006 {
1007 memcpy(data, stbldata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1008
1009 dealbox4stss(data);
1010
1011 free(data);
1012 data = null;
1013 }
1014 }
1015 else if (0 == strcmp(boxtype, box_type_stsc))
1016 {
1017 data = (unsigned char*)malloc(boxsize);
1018 if (data)
1019 {
1020 memcpy(data, stbldata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1021
1022 dealbox4stsc(data);
1023
1024 free(data);
1025 data = null;
1026 }
1027 }
1028 else if (0 == strcmp(boxtype, box_type_stsz))
1029 {
1030 data = (unsigned char*)malloc(boxsize);
1031 if (data)
1032 {
1033 memcpy(data, stbldata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1034
1035 dealbox4stsz(data);
1036
1037 free(data);
1038 data = null;
1039 }
1040 }
1041 else if (0 == strcmp(boxtype, box_type_stco))
1042 {
1043 data = (unsigned char*)malloc(boxsize);
1044 if (data)
1045 {
1046 memcpy(data, stbldata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1047
1048 dealbox4stco(data);
1049
1050 free(data);
1051 data = null;
1052 }
1053 }
1054
1055 stbldata += boxsize;
1056 stbldatasize -= boxsize;
1057 }
1058 }
1059
1060 static void dealbox4mdhd(const unsigned char *mdhddata)
1061 {
1062 unsigned char *data = null;
1063
1064 t_box4mdhd box4mdhd = {0};
1065
1066 memset(&box4mdhd, 0x0, sizeof(box4mdhd));
1067
1068 data = (unsigned char *)mdhddata;
1069
1070 data += 4;
1071 box4mdhd.creation_time = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
1072
1073 data += 4;
1074 box4mdhd.modification_time = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
1075
1076 data += 4;
1077 box4mdhd.timescale = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
1078
1079 data += 4;
1080 box4mdhd.duration = data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3];
1081
1082 data += 4;
1083 box4mdhd.language = data[0] << 8 | data[1];
1084
1085 #ifdef printf_debug
1086 //printf("\t\t\tcreation_time: %d, modification_time: %d, timescale: %d, duration: %d, language: %c%c%c\n",
1087 //box4mdhd.creation_time, box4mdhd.modification_time, box4mdhd.timescale, box4mdhd.duration, (box4mdhd.language>>10&0x1f), (box4mdhd.language>>5&0x1f), (box4mdhd.language&0x1f));
1088
1089 printf("\t\t\t\tcreation_time: %d, modification_time: %d, timescale: %d, duration: %d, language:%d\n",
1090 box4mdhd.creation_time, box4mdhd.modification_time, box4mdhd.timescale, box4mdhd.duration, box4mdhd.language);
1091 #endif
1092 }
1093
1094 static void dealbox4hdlr(const unsigned char *hdlrdata)
1095 {
1096 int i = 0;
1097
1098 unsigned char *data = null;
1099
1100 t_box4hdlr box4hdlr = {0};
1101
1102 memset(&box4hdlr, 0x0, sizeof(box4hdlr));
1103
1104 data = (unsigned char *)hdlrdata;
1105
1106 data += 4;
1107 data += 4;
1108
1109 memcpy(box4hdlr.handler_type, data, 4);
1110
1111 box4hdlr.handler_type[max_handler_type_len] = '\0';
1112
1113 data += 4;
1114
1115 data += 12;
1116
1117 while ('\0' != data[i])
1118 {
1119 i++;
1120 }
1121
1122 memcpy(box4hdlr.name, data, i);
1123
1124 box4hdlr.name[max_hdlr_name_len] = '\0';
1125
1126 #ifdef printf_debug
1127 printf("\t\t\t\thandler_type: %s, name: %s\n", box4hdlr.handler_type, box4hdlr.name);
1128 #endif
1129 }
1130
1131 static void dealbox4vmdhd(const unsigned char *vmdhddata)
1132 {
1133 // todo
1134 }
1135
1136 static void dealbox4minf(const t_box *box)
1137 { int boxsize = 0;
1138 int minfdatasize = 0;
1139
1140 unsigned char *minfdata = null;
1141 unsigned char *data = null;
1142
1143 char boxtype[max_box_type_len+1] = {0};
1144
1145 t_box dinfbox = {0};
1146 t_box stblbox = {0};
1147
1148 minfdata = box->boxdata;
1149 minfdatasize = box->boxheader.boxsize-max_box_size_len-max_box_type_len;
1150
1151 while (minfdatasize > 0)
1152 {
1153 boxsize = minfdata[0] << 24 | minfdata[1] << 16 | minfdata[2] << 8 | minfdata[3];
1154
1155 memcpy(boxtype, minfdata+max_box_size_len, 4);
1156
1157 #ifdef printf_debug
1158 printf("\t\t\t\t********box: layer5********\n");
1159 printf("\t\t\t\t\tsize: %d\n", boxsize);
1160 printf("\t\t\t\t\ttype: %s\n", boxtype);
1161 #endif
1162 if (0 == strcmp(boxtype, box_type_vmhd))
1163 {
1164 data = (unsigned char*)malloc(boxsize);
1165 if (data)
1166 {
1167 memcpy(data, minfdata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1168
1169 dealbox4vmdhd(data);
1170
1171 free(data);
1172 data = null;
1173 }
1174 }
1175 else if (0 == strcmp(boxtype, box_type_dinf))
1176 {
1177 memset(&dinfbox, 0x0, sizeof(t_box));
1178
1179 dinfbox.boxheader.boxsize = boxsize;
1180
1181 memcpy(dinfbox.boxheader.boxtype, boxtype, strlen(boxtype));
1182
1183 dinfbox.boxdata = (unsigned char*)malloc(boxsize);
1184 if (dinfbox.boxdata)
1185 {
1186 memcpy(dinfbox.boxdata, minfdata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1187
1188 dealbox4dinf((const t_box*)&dinfbox);
1189
1190 free(dinfbox.boxdata);
1191 dinfbox.boxdata = null;
1192 }
1193 }
1194 else if (0 == strcmp(boxtype, box_type_stbl))
1195 {
1196 memset(&stblbox, 0x0, sizeof(t_box));
1197
1198 stblbox.boxheader.boxsize = boxsize;
1199
1200 memcpy(stblbox.boxheader.boxtype, boxtype, strlen(boxtype));
1201
1202 stblbox.boxdata = (unsigned char*)malloc(boxsize);
1203 if (stblbox.boxdata)
1204 {
1205 memcpy(stblbox.boxdata, minfdata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1206
1207 dealbox4stbl((const t_box*)&stblbox);
1208
1209 free(stblbox.boxdata);
1210 stblbox.boxdata = null;
1211 }
1212 }
1213
1214 minfdata += boxsize;
1215 minfdatasize -= boxsize;
1216 }
1217 }
1218
1219 static void dealbox4mdia(const t_box *box)
1220 { int boxsize = 0;
1221 int mdiadatasize = 0;
1222
1223 unsigned char *mdiadata = null;
1224 unsigned char *data = null;
1225
1226 char boxtype[max_box_type_len+1] = {0};
1227
1228 t_box minfbox = {0};
1229
1230 mdiadata = box->boxdata;
1231 mdiadatasize = box->boxheader.boxsize-max_box_size_len-max_box_type_len;
1232
1233 while (mdiadatasize > 0)
1234 {
1235 boxsize = mdiadata[0] << 24 | mdiadata[1] << 16 | mdiadata[2] << 8 | mdiadata[3];
1236
1237 memcpy(boxtype, mdiadata+max_box_size_len, 4);
1238
1239 #ifdef printf_debug
1240 printf("\t\t\t************box: layer4************\n");
1241 printf("\t\t\t\tsize: %d\n", boxsize);
1242 printf("\t\t\t\ttype: %s\n", boxtype);
1243 #endif
1244 if (0 == strcmp(boxtype, box_type_mdhd))
1245 {
1246 data = (unsigned char*)malloc(boxsize);
1247 if (data)
1248 {
1249 memcpy(data, mdiadata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1250
1251 dealbox4mdhd(data);
1252
1253 free(data);
1254 data = null;
1255 }
1256 }
1257 else if (0 == strcmp(boxtype, box_type_hdlr))
1258 {
1259 data = (unsigned char*)malloc(boxsize);
1260 if (data)
1261 {
1262 memcpy(data, mdiadata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1263
1264 dealbox4hdlr(data);
1265
1266 free(data);
1267 data = null;
1268 }
1269 }
1270 else if (0 == strcmp(boxtype, box_type_minf))
1271 {
1272 memset(&minfbox, 0x0, sizeof(t_box));
1273
1274 minfbox.boxheader.boxsize = boxsize;
1275
1276 memcpy(minfbox.boxheader.boxtype, boxtype, strlen(boxtype));
1277
1278 minfbox.boxdata = (unsigned char*)malloc(boxsize);
1279 if (minfbox.boxdata)
1280 {
1281 memcpy(minfbox.boxdata, mdiadata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1282
1283 dealbox4minf((const t_box*)&minfbox);
1284
1285 free(minfbox.boxdata);
1286 minfbox.boxdata = null;
1287 }
1288 }
1289
1290 mdiadata += boxsize;
1291 mdiadatasize -= boxsize;
1292 }
1293 }
1294
1295 static void dealbox4trak(const t_box *box)
1296 {
1297 int boxsize = 0;
1298 int trakdatasize = 0;
1299
1300 unsigned char *trakdata = null;
1301 unsigned char *data = null;
1302
1303 char boxtype[max_box_type_len+1] = {0};
1304
1305 t_box mdiabox = {0};
1306
1307 trakdata = box->boxdata;
1308 trakdatasize = box->boxheader.boxsize-max_box_size_len-max_box_type_len;
1309
1310 while (trakdatasize > 0)
1311 {
1312 boxsize = trakdata[0] << 24 | trakdata[1] << 16 | trakdata[2] << 8 | trakdata[3];
1313
1314 memcpy(boxtype, trakdata+max_box_size_len, 4);
1315
1316 #ifdef printf_debug
1317 printf("\t\t****************box: layer3****************\n");
1318 printf("\t\t\tsize: %d\n", boxsize);
1319 printf("\t\t\ttype: %s\n", boxtype);
1320 #endif
1321
1322 if (0 == strcmp(boxtype, box_type_tkhd))
1323 {
1324 data = (unsigned char*)malloc(boxsize);
1325 if (data)
1326 {
1327 memcpy(data, trakdata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1328
1329 dealbox4tkhd(data);
1330
1331 free(data);
1332 data = null;
1333 }
1334 }
1335 else if (0 == strcmp(boxtype, box_type_mdia))
1336 {
1337 memset(&mdiabox, 0x0, sizeof(t_box));
1338
1339 mdiabox.boxheader.boxsize = boxsize;
1340
1341 memcpy(mdiabox.boxheader.boxtype, boxtype, strlen(boxtype));
1342
1343 mdiabox.boxdata = (unsigned char*)malloc(boxsize);
1344 if (mdiabox.boxdata)
1345 {
1346 memcpy(mdiabox.boxdata, trakdata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1347
1348 dealbox4mdia((const t_box*)&mdiabox);
1349
1350 free(mdiabox.boxdata);
1351 mdiabox.boxdata = null;
1352 }
1353 }
1354
1355 trakdata += boxsize;
1356 trakdatasize -= boxsize;
1357 }
1358 }
1359
1360 static void dealbox4moov(const t_box *box)
1361 {
1362 int boxsize = 0;
1363 int moovdatasize = 0;
1364
1365 unsigned char *moovdata = null;
1366 unsigned char *data = null;
1367
1368 char boxtype[max_box_type_len+1] = {0};
1369
1370 t_box trakbox = {0};
1371
1372 moovdata = box->boxdata;
1373 moovdatasize = box->boxheader.boxsize-max_box_size_len-max_box_type_len;
1374
1375 while (moovdatasize > 0)
1376 {
1377 boxsize = moovdata[0] << 24 | moovdata[1] << 16 | moovdata[2] << 8 | moovdata[3];
1378
1379 memcpy(boxtype, moovdata+max_box_size_len, 4);
1380
1381 boxtype[max_box_type_len] = '\0';
1382
1383 #ifdef printf_debug
1384 printf("\t********************box: layer2********************\n");
1385 printf("\t\tsize: %d\n", boxsize);
1386 printf("\t\ttype: %s\n", boxtype);
1387 #endif
1388
1389 if (0 == strcmp(boxtype, box_type_mvhd))
1390 {
1391 data = (unsigned char*)malloc(boxsize);
1392 if (data)
1393 {
1394 memcpy(data, moovdata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1395
1396 dealbox4mvhd(data);
1397
1398 free(data);
1399 data = null;
1400 }
1401 }
1402 else if (0 == strcmp(boxtype, box_type_trak))
1403 {
1404 memset(&trakbox, 0x0, sizeof(t_box));
1405
1406 trakbox.boxheader.boxsize = boxsize;
1407
1408 memcpy(trakbox.boxheader.boxtype, boxtype, strlen(boxtype));
1409
1410 trakbox.boxdata = (unsigned char*)malloc(boxsize);
1411 if (trakbox.boxdata)
1412 {
1413 memcpy(trakbox.boxdata, moovdata+max_box_size_len+max_box_type_len, boxsize-max_box_size_len-max_box_type_len);
1414
1415 dealbox4trak((const t_box*)&trakbox);
1416
1417 free(trakbox.boxdata);
1418 trakbox.boxdata = null;
1419 }
1420 }
1421
1422 moovdata += boxsize;
1423 moovdatasize -= boxsize;
1424 }
1425 }
1426
1427 static void dealbox(const t_box *box)
1428 {
1429 #ifdef printf_debug
1430 printf("****************************box: layer1****************************\n");
1431 printf("\tsize: %d\n", box->boxheader.boxsize);
1432 printf("\ttype: %s\n", box->boxheader.boxtype);
1433 #endif
1434
1435 if (0 == strcmp(box->boxheader.boxtype, box_type_ftype))
1436 {
1437 dealbox4ftyp(box);
1438 }
1439 else if (0 == strcmp(box->boxheader.boxtype, box_type_moov))
1440 {
1441 dealbox4moov(box);
1442 }
1443 }
1444
1445 int main(int argc, char *argv[])
1446 {
1447 unsigned char boxsize[max_box_size_len] = {0};
1448
1449 file *fp = null;
1450
1451 t_box box = {0};
1452
1453 if (2 != argc)
1454 {
1455 printf("usage: mp4parse **.mp4\n");
1456
1457 return -1;
1458 }
1459
1460 fp = fopen(argv[1], "rb");
1461 if (!fp)
1462 {
1463 printf("open file[%s] error!\n", argv[1]);
1464
1465 return -1;
1466 }
1467
1468
1469 while (1)
1470 {
1471 memset(&box, 0x0, sizeof(t_box));
1472
1473 if (fread(boxsize, 1, 4, fp) <= 0)
1474 {
1475 break;
1476 }
1477
1478 box.boxheader.boxsize = boxsize[0] << 24 | boxsize[1] << 16 | boxsize[2] << 8 | boxsize[3];
1479
1480 fread(box.boxheader.boxtype, 1, 4, fp);
1481
1482 box.boxheader.boxtype[max_box_type_len] = '\0';
1483
1484 box.boxdata = (unsigned char*)malloc(box.boxheader.boxsize-max_box_size_len-max_box_type_len);
1485 if (!box.boxdata)
1486 {
1487 printf("malloc data error!\n");
1488
1489 break;
1490 }
1491
1492 fread(box.boxdata, 1, box.boxheader.boxsize-max_box_size_len-max_box_type_len, fp);
1493
1494 /* deal box data */
1495 dealbox(&box);
1496
1497 /* free box */
1498 free(box.boxdata);
1499
1500 box.boxdata = null;
1501 }
1502
1503 fclose(fp);
1504
1505 return 0;
1506 }
上一篇： MySQL数据库级别的外键
下一篇： RMAN优缺点及RMAN备份及恢复步骤