-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathmain.c
708 lines (708 loc) · 24.5 KB
/
main.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
////
//// main.c
//// demo
////
//// Created by Apple on 2018/12/24.
//// Copyright © 2018年 Apple. All rights reserved.
////
//
//#include <stdio.h>
//#include <libavutil/log.h>
//#include <libavformat/avformat.h>
//#include <libavformat/avio.h>
//#include "second.h"
//struct hello {
// int a;
// int b;
//};
//typedef struct hello Hello;
//
//#ifndef AV_WB32
//# define AV_WB32(p, val) do { \
//uint32_t d = (val); \
//((uint8_t*)(p))[3] = (d); \
//((uint8_t*)(p))[2] = (d)>>8; \
//((uint8_t*)(p))[1] = (d)>>16; \
//((uint8_t*)(p))[0] = (d)>>24; \
//} while(0)
//#endif
//
//#ifndef AV_RB16
//# define AV_RB16(x) \
//((((const uint8_t*)(x))[0] << 8) | \
//((const uint8_t*)(x))[1])
//#endif
//
//static int alloc_and_copy(AVPacket *out,
// const uint8_t *sps_pps, uint32_t sps_pps_size,
// const uint8_t *in, uint32_t in_size)
//{
// uint32_t offset = out->size;
// uint8_t nal_header_size = offset ? 3 : 4;
// int err;
//
// err = av_grow_packet(out, sps_pps_size + in_size + nal_header_size);
// if (err < 0)
// return err;
//
// if (sps_pps)
// memcpy(out->data + offset, sps_pps, sps_pps_size);
// memcpy(out->data + sps_pps_size + nal_header_size + offset, in, in_size);
// if (!offset) {
// AV_WB32(out->data + sps_pps_size, 1);
// } else {
// (out->data + offset + sps_pps_size)[0] =
// (out->data + offset + sps_pps_size)[1] = 0;
// (out->data + offset + sps_pps_size)[2] = 1;
// }
//
// return 0;
//}
//
//int h264_extradata_to_annexb(const uint8_t *codec_extradata, const int codec_extradata_size, AVPacket *out_extradata, int padding)
//{
// uint16_t unit_size;
// uint64_t total_size = 0;
// uint8_t *out = NULL, unit_nb, sps_done = 0,
// sps_seen = 0, pps_seen = 0, sps_offset = 0, pps_offset = 0;
// const uint8_t *extradata = codec_extradata + 4;
// static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
// int length_size = (*extradata++ & 0x3) + 1; // retrieve length coded size, 用于指示表示编码数据长度所需字节数
//
// sps_offset = pps_offset = -1;
//
// /* retrieve sps and pps unit(s) */
// unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
// if (!unit_nb) {
// goto pps;
// }else {
// sps_offset = 0;
// sps_seen = 1;
// }
//
// while (unit_nb--) {
// int err;
//
// unit_size = AV_RB16(extradata);
// total_size += unit_size + 4;
// if (total_size > INT_MAX - padding) {
// av_log(NULL, AV_LOG_ERROR,
// "Too big extradata size, corrupted stream or invalid MP4/AVCC bitstream\n");
// av_free(out);
// return AVERROR(EINVAL);
// }
// if (extradata + 2 + unit_size > codec_extradata + codec_extradata_size) {
// av_log(NULL, AV_LOG_ERROR, "Packet header is not contained in global extradata, "
// "corrupted stream or invalid MP4/AVCC bitstream\n");
// av_free(out);
// return AVERROR(EINVAL);
// }
// if ((err = av_reallocp(&out, total_size + padding)) < 0)
// return err;
// memcpy(out + total_size - unit_size - 4, nalu_header, 4);
// memcpy(out + total_size - unit_size, extradata + 2, unit_size);
// extradata += 2 + unit_size;
// pps:
// if (!unit_nb && !sps_done++) {
// unit_nb = *extradata++; /* number of pps unit(s) */
// if (unit_nb) {
// pps_offset = total_size;
// pps_seen = 1;
// }
// }
// }
//
// if (out)
// memset(out + total_size, 0, padding);
//
// if (!sps_seen)
// av_log(NULL, AV_LOG_WARNING,
// "Warning: SPS NALU missing or invalid. "
// "The resulting stream may not play.\n");
//
// if (!pps_seen)
// av_log(NULL, AV_LOG_WARNING,
// "Warning: PPS NALU missing or invalid. "
// "The resulting stream may not play.\n");
//
// out_extradata->data = out;
// out_extradata->size = total_size;
//
// return length_size;
//}
//
//int h264_mp4toannexb(AVFormatContext *fmt_ctx, AVPacket *in, FILE *dst_fd)
//{
//
// AVPacket *out = NULL;
// AVPacket spspps_pkt;
//
// int len;
// uint8_t unit_type;
// int32_t nal_size;
// uint32_t cumul_size = 0;
// const uint8_t *buf;
// const uint8_t *buf_end;
// int buf_size;
// int ret = 0, i;
//
// out = av_packet_alloc();
//
// buf = in->data;
// buf_size = in->size;
// buf_end = in->data + in->size;
//
// do {
// ret= AVERROR(EINVAL);
// if (buf + 4 /*s->length_size*/ > buf_end)
// goto fail;
//
// for (nal_size = 0, i = 0; i<4/*s->length_size*/; i++)
// nal_size = (nal_size << 8) | buf[i];
//
// buf += 4; /*s->length_size;*/
// unit_type = *buf & 0x1f;
//
// if (nal_size > buf_end - buf || nal_size < 0)
// goto fail;
//
// /*
// if (unit_type == 7)
// s->idr_sps_seen = s->new_idr = 1;
// else if (unit_type == 8) {
// s->idr_pps_seen = s->new_idr = 1;
// */
// /* if SPS has not been seen yet, prepend the AVCC one to PPS */
// /*
// if (!s->idr_sps_seen) {
// if (s->sps_offset == -1)
// av_log(ctx, AV_LOG_WARNING, "SPS not present in the stream, nor in AVCC, stream may be unreadable\n");
// else {
// if ((ret = alloc_and_copy(out,
// ctx->par_out->extradata + s->sps_offset,
// s->pps_offset != -1 ? s->pps_offset : ctx->par_out->extradata_size - s->sps_offset,
// buf, nal_size)) < 0)
// goto fail;
// s->idr_sps_seen = 1;
// goto next_nal;
// }
// }
// }
// */
//
// /* if this is a new IDR picture following an IDR picture, reset the idr flag.
// * Just check first_mb_in_slice to be 0 as this is the simplest solution.
// * This could be checking idr_pic_id instead, but would complexify the parsing. */
// /*
// if (!s->new_idr && unit_type == 5 && (buf[1] & 0x80))
// s->new_idr = 1;
//
// */
// /* prepend only to the first type 5 NAL unit of an IDR picture, if no sps/pps are already present */
// if (/*s->new_idr && */unit_type == 5 /*&& !s->idr_sps_seen && !s->idr_pps_seen*/) {
//
// h264_extradata_to_annexb( fmt_ctx->streams[in->stream_index]->codec->extradata,
// fmt_ctx->streams[in->stream_index]->codec->extradata_size,
// &spspps_pkt,
// AV_INPUT_BUFFER_PADDING_SIZE);
//
// if ((ret=alloc_and_copy(out,
// spspps_pkt.data, spspps_pkt.size,
// buf, nal_size)) < 0)
// goto fail;
// /*s->new_idr = 0;*/
// /* if only SPS has been seen, also insert PPS */
// }
// /*else if (s->new_idr && unit_type == 5 && s->idr_sps_seen && !s->idr_pps_seen) {
// if (s->pps_offset == -1) {
// av_log(ctx, AV_LOG_WARNING, "PPS not present in the stream, nor in AVCC, stream may be unreadable\n");
// if ((ret = alloc_and_copy(out, NULL, 0, buf, nal_size)) < 0)
// goto fail;
// } else if ((ret = alloc_and_copy(out,
// ctx->par_out->extradata + s->pps_offset, ctx->par_out->extradata_size - s->pps_offset,
// buf, nal_size)) < 0)
// goto fail;
// }*/ else {
// if ((ret=alloc_and_copy(out, NULL, 0, buf, nal_size)) < 0)
// goto fail;
// /*
// if (!s->new_idr && unit_type == 1) {
// s->new_idr = 1;
// s->idr_sps_seen = 0;
// s->idr_pps_seen = 0;
// }
// */
// }
//
//
// len = fwrite( out->data, 1, out->size, dst_fd);
// if(len != out->size){
// av_log(NULL, AV_LOG_DEBUG, "warning, length of writed data isn't equal pkt.size(%d, %d)\n",
// len,
// out->size);
// }
// fflush(dst_fd);
//
// next_nal:
// buf += nal_size;
// cumul_size += nal_size + 4;//s->length_size;
// } while (cumul_size < buf_size);
//
// /*
// ret = av_packet_copy_props(out, in);
// if (ret < 0)
// goto fail;
//
// */
//fail:
// av_packet_free(&out);
//
// return ret;
//}
//
//void adts_header(char *szAdtsHeader, int dataLen){
//
// int audio_object_type = 2;
// int sampling_frequency_index = 7;
// int channel_config = 2;
//
// int adtsLen = dataLen + 7;
//
// szAdtsHeader[0] = 0xff; //syncword:0xfff 高8bits
// szAdtsHeader[1] = 0xf0; //syncword:0xfff 低4bits
// szAdtsHeader[1] |= (0 << 3); //MPEG Version:0 for MPEG-4,1 for MPEG-2 1bit
// szAdtsHeader[1] |= (0 << 1); //Layer:0 2bits
// szAdtsHeader[1] |= 1; //protection absent:1 1bit
//
// szAdtsHeader[2] = (audio_object_type - 1)<<6; //profile:audio_object_type - 1 2bits
// szAdtsHeader[2] |= (sampling_frequency_index & 0x0f)<<2; //sampling frequency index:sampling_frequency_index 4bits
// szAdtsHeader[2] |= (0 << 1); //private bit:0 1bit
// szAdtsHeader[2] |= (channel_config & 0x04)>>2; //channel configuration:channel_config 高1bit
//
// szAdtsHeader[3] = (channel_config & 0x03)<<6; //channel configuration:channel_config 低2bits
// szAdtsHeader[3] |= (0 << 5); //original：0 1bit
// szAdtsHeader[3] |= (0 << 4); //home：0 1bit
// szAdtsHeader[3] |= (0 << 3); //copyright id bit：0 1bit
// szAdtsHeader[3] |= (0 << 2); //copyright id start：0 1bit
// szAdtsHeader[3] |= ((adtsLen & 0x1800) >> 11); //frame length：value 高2bits
//
// szAdtsHeader[4] = (uint8_t)((adtsLen & 0x7f8) >> 3); //frame length:value 中间8bits
// szAdtsHeader[5] = (uint8_t)((adtsLen & 0x7) << 5); //frame length:value 低3bits
// szAdtsHeader[5] |= 0x1f; //buffer fullness:0x7ff 高5bits
// szAdtsHeader[6] = 0xfc;
//}
//int sum(int a,int b){
// return a+b;
//}
//
//int main(int argc, const char * argv[]) {
// // insert code here...
//// printf("Hello, World!\n");
// int result=0;
//
// av_log_set_level(AV_LOG_DEBUG);
////
//// av_log(NULL, AV_LOG_DEBUG, "呜呜呜 终于出来了DEBUG\n");
////
//// av_log(NULL, AV_LOG_ERROR, "AV_LOG_ERROR\n");
////
//// av_log(NULL, AV_LOG_INFO, "AV_LOG_INFO\n");
////// 删除文件
//// result=avpriv_io_delete("/Users/apple/Desktop/DSC_0362.JPG");
//////
//// av_log(NULL,AV_LOG_ERROR, "result == %d",result);
////// av_log(NULL, AV_LOG_INFO, "AV_LOG_INFO\n");
////
//// AVIODirContext *avioDirContext=NULL;
//// AVIODirEntry *avioEntry=NULL;
////
//// result= avio_open_dir(&avioDirContext, "../../../../", NULL);
//// if (result<0) {
//// av_log(NULL,AV_LOG_ERROR, "\n打开文件目录结果 result == %s",av_err2str(result));
//// return -1;
//// }
////
//// while (1) {
//// result=avio_read_dir(avioDirContext, &avioEntry);
//// if (result<0) {
//// av_log(NULL,AV_LOG_ERROR, "\n读取文件目录结果 result == %s",av_err2str(result));
//// return -1;
//// }
////
//// if (!avioEntry) {
//// break;
//// }
////
////// 打印文件部分属性
//// av_log(NULL,AV_LOG_ERROR, "\n %12s"PRId64" %lld \n",avioEntry->name,avioEntry->size);
////
//// avio_free_directory_entry(&avioEntry);
////
//// }
////// 关闭目录操作
//// result=avio_close_dir(&avioDirContext);
////
//// av_log(NULL,AV_LOG_ERROR, "\n关闭文件目录结果 result == %s",av_err2str(result));
////
//// return result;
//
//// AVPacket packet;
//// int audio_index=0;
//// AVFormatContext *formatContext=NULL;
////
//// av_log_set_level(AV_LOG_DEBUG);
////
//// av_register_all();
////
//// result= avformat_open_input(&formatContext, "/Users/apple/Desktop/MV/周深 - 大鱼.mp4", NULL,NULL);
////
////
//// if (result<0) {
//// av_log(NULL, AV_LOG_ERROR, "打开视频失败 错误码%s\n",av_err2str(result));
//// return -1;
//// }
// // y第一个参数表示之前打开文件的上下文。第二个参数表示流的索引 第三个表示之前的文件地址。第四个参数表示是输入还是输出
//// av_dump_format(formatContext, 0, "/Users/apple/Desktop/MV/陈奕迅 - 富士山下 (DUO 陈奕迅2010演唱会Live).mp4", 0);
//
// // 提取音频为aac;
//// FILE *dst_fd=fopen("/Users/apple/Desktop/MV/test.aac", "wb");
////
//// result=av_find_best_stream(formatContext, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);
//// audio_index=result;
//// if (result<0) {
//// av_log(NULL, AV_LOG_ERROR, "获取流失败 错误码 %s\n",av_err2str(result));
//// avformat_close_input(&formatContext);
//// fclose(dst_fd);
//// return -1;
//// }
////
//// av_init_packet(&packet);
//// int len;
//// while (av_read_frame(formatContext, &packet)>=0) {
//// if (packet.stream_index==audio_index) {
////
//// char adts_header_buf[7];
//// adts_header(adts_header_buf,packet.size);
//// fwrite(adts_header_buf, 1, 7, dst_fd);
//// len=fwrite(packet.data, 1, packet.size, dst_fd);
////
//// if (len!=packet.size) {
//// av_log(NULL, AV_LOG_ERROR, "长度不相等");
//// }
//// }
//// av_packet_unref(&packet);
//// }
////
//// avformat_close_input(&formatContext);
////
////
//// if (dst_fd) {
//// fclose(dst_fd);
//// }
// // av_log(NULL, AV_LOG_INFO, )
//
//
//// 提取视频为h264
//
//// FILE *dst_fd=fopen("/Users/apple/Desktop/MV/test.h264", "wb");
////
//// AVPacket videoPacket;
//// av_init_packet(&videoPacket);
////
//// int video_stream_index=av_find_best_stream(formatContext, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
////
//// if (video_stream_index<0) {
//// av_log(NULL, AV_LOG_ERROR, "\nvideo stream cant find...");
//// return -1;
//// }
////
//// while (av_read_frame(formatContext, &videoPacket)>=0) {
////
//// if (videoPacket.stream_index==video_stream_index) {
//// h264_mp4toannexb(formatContext, &videoPacket, dst_fd);
//// }
////
//// av_packet_unref(&videoPacket);
//// }
////
//// avformat_close_input(&formatContext);
//// if (dst_fd) {
//// fclose(dst_fd);
//// }
//
//// 将mp4视频转换为flv
//// char *outfilename="/Users/apple/Desktop/MV/test.flv";
////
//// FILE *dst_fd=fopen(outfilename, "wb");
////
//// AVFormatContext *outFormatContext=NULL;
//// AVOutputFormat *outFormat=NULL;
//// AVPacket pkt;
//// int stream_mappint_size;
//// int *stream_mapping=NULL;
//// int stream_index=0;
////
//// av_init_packet(&pkt);
//// avformat_alloc_output_context2(&outFormatContext, NULL, NULL, outfilename);
////
//// if (!outFormatContext) {
//// av_log(NULL, AV_LOG_ERROR, "cant alloc output context\n");
//// return -1;
//// }
////
//// stream_mappint_size=formatContext->nb_streams;
////
//// stream_mapping=av_mallocz_array(stream_mappint_size, sizeof(stream_mapping));
////
//// outFormat=outFormatContext->oformat;
////
////
//// for (int i=0;i<formatContext->nb_streams; i++) {
//// AVStream *outStream=NULL;
//// AVStream *inStream=formatContext->streams[i];
////
//// AVCodecParameters *inCodecPar=inStream->codecpar;
////
//// if (inCodecPar->codec_type!=AVMEDIA_TYPE_VIDEO&&
//// inCodecPar->codec_type!=AVMEDIA_TYPE_AUDIO&&
//// inCodecPar->codec_type!=AVMEDIA_TYPE_SUBTITLE) {
////
//// stream_mapping[i]=-1;
////
//// continue;
//// }
////
//// stream_mapping[i]=stream_index++;
////
//// outStream=avformat_new_stream(outFormatContext, NULL);
////
//// if (!outStream) {
//// av_log(NULL, AV_LOG_ERROR, "cant alloc new output stream\n");
//// return -1;
//// }
////
//// result=avcodec_parameters_copy(outStream->codecpar, inCodecPar);
////
//// if (result<0) {
//// av_log(NULL, AV_LOG_ERROR, "cant copy parameters\n");
//// return -1;
//// }
////
//// outStream->codecpar->codec_tag=0;
////
//// if (!(outFormat->flags&AVFMT_NOFILE)) {
//// result=avio_open(&outFormatContext->pb, outfilename, AVIO_FLAG_WRITE);
//// if (result<0) {
//// av_log(NULL, AV_LOG_ERROR, "Could not open output file\n");
//// return -1;
//// }
//// }
////
////
//// result=avformat_write_header(outFormatContext, NULL);
//// if (result < 0) {
//// fprintf(stderr, "Error occurred when opening output file\n");
//// goto end;
//// }
////
//// while (1) {
//// AVStream *inStream,*outStream;
////
//// result=av_read_frame(formatContext, &pkt);
////
//// if (result<0) {
//// break;
//// }
////
//// inStream=formatContext->streams[pkt.stream_index];
////
//// if (pkt.stream_index >= stream_mappint_size ||
//// stream_mapping[pkt.stream_index] < 0) {
//// av_packet_unref(&pkt);
//// continue;
//// }
////
////
//// pkt.stream_index = stream_mapping[pkt.stream_index];
//// outStream = outFormatContext->streams[pkt.stream_index];
////
//// /* copy packet */
//// pkt.pts = av_rescale_q_rnd(pkt.pts, inStream->time_base, outStream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
//// pkt.dts = av_rescale_q_rnd(pkt.dts, inStream->time_base, outStream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
//// pkt.duration = av_rescale_q(pkt.duration, inStream->time_base, outStream->time_base);
//// pkt.pos = -1;
////
//// result=av_interleaved_write_frame(outFormatContext, &pkt);
////
//// if (result<-1) {
//// av_log(NULL, AV_LOG_ERROR, "Could not write frame \n");
//// return -1;
//// }
////
//// av_packet_unref(&pkt);
////
//// }
//// av_write_trailer(outFormatContext);
////
//// }
////
//// avformat_close_input(formatContext);
////
//// /* close output */
//// if (outFormatContext && !(outFormat->flags & AVFMT_NOFILE))
//// avio_closep(&outFormatContext->pb);
//// avformat_free_context(outFormatContext);
////
//// av_freep(&stream_mapping);
////
//// if (result < 0 && result != AVERROR_EOF) {
//// fprintf(stderr, "Error occurred: %s\n", av_err2str(result));
//// return 1;
//// }
////end:
//// return -1;
////
////
//// return 0;
//
// AVOutputFormat *ofmt = NULL;
// AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
// AVPacket pkt;
// const char *in_filename, *out_filename;
// int ret, i;
// int stream_index = 0;
// int *stream_mapping = NULL;
// int stream_mapping_size = 0;
//
//
// in_filename = "/Users/apple/Desktop/FFmpeg音视频核心技术精讲与实战/第1章 课程导学与准备工作/1-2 课程导学.mp4";
// out_filename = "/Users/apple/Desktop/MV/test.avi";
//
// av_register_all();
//
// if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
// fprintf(stderr, "Could not open input file '%s'", in_filename);
// goto end;
// }
//
// if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
// fprintf(stderr, "Failed to retrieve input stream information");
// goto end;
// }
// av_log(NULL, AV_LOG_ERROR, "input file format \n");
// av_dump_format(ifmt_ctx, 0, in_filename, 0);
//
// avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
// if (!ofmt_ctx) {
// fprintf(stderr, "Could not create output context\n");
// ret = AVERROR_UNKNOWN;
// goto end;
// }
//
// stream_mapping_size = ifmt_ctx->nb_streams;
// stream_mapping = av_mallocz_array(stream_mapping_size, sizeof(*stream_mapping));
// if (!stream_mapping) {
// ret = AVERROR(ENOMEM);
// goto end;
// }
//
// ofmt = ofmt_ctx->oformat;
//
// for (i = 0; i < ifmt_ctx->nb_streams; i++) {
// AVStream *out_stream;
// AVStream *in_stream = ifmt_ctx->streams[i];
// AVCodecParameters *in_codecpar = in_stream->codecpar;
//
// if (in_codecpar->codec_type != AVMEDIA_TYPE_AUDIO &&
// in_codecpar->codec_type != AVMEDIA_TYPE_VIDEO &&
// in_codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
// stream_mapping[i] = -1;
// continue;
// }
//
// stream_mapping[i] = stream_index++;
//
// out_stream = avformat_new_stream(ofmt_ctx, NULL);
// if (!out_stream) {
// fprintf(stderr, "Failed allocating output stream\n");
// ret = AVERROR_UNKNOWN;
// goto end;
// }
//
// ret = avcodec_parameters_copy(out_stream->codecpar, in_codecpar);
// if (ret < 0) {
// fprintf(stderr, "Failed to copy codec parameters\n");
// goto end;
// }
// out_stream->codecpar->codec_tag = 0;
// }
// av_log(NULL, AV_LOG_ERROR, "dump output file format\n");
// av_dump_format(ofmt_ctx, 0, out_filename, 1);
//// 打开输出文件
// if (!(ofmt->flags & AVFMT_NOFILE)) {
// ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
// if (ret < 0) {
// fprintf(stderr, "Could not open output file '%s'", out_filename);
// goto end;
// }
// }
// AVDictionary *dict=NULL;
// av_dict_set(&dict, "vstrict", "-1", 0);
// ret = avformat_write_header(ofmt_ctx, &dict);
// if (ret < 0) {
// fprintf(stderr, "Error occurred when opening output file %d %s\n",ret,av_err2str(ret));
// goto end;
// }
//
// while (1) {
// AVStream *in_stream, *out_stream;
//
// ret = av_read_frame(ifmt_ctx, &pkt);
// if (ret < 0)
// break;
//
// in_stream = ifmt_ctx->streams[pkt.stream_index];
// if (pkt.stream_index >= stream_mapping_size ||
// stream_mapping[pkt.stream_index] < 0) {
// av_packet_unref(&pkt);
// continue;
// }
//
// pkt.stream_index = stream_mapping[pkt.stream_index];
// out_stream = ofmt_ctx->streams[pkt.stream_index];
//// log_packet(ifmt_ctx, &pkt, "in");
//
// /* copy packet */
// pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
// pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
// pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
// pkt.pos = -1;
//// log_packet(ofmt_ctx, &pkt, "out");
//
// ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
// if (ret < 0) {
// fprintf(stderr, "Error muxing packet\n");
// break;
// }
// av_packet_unref(&pkt);
// }
//
// av_write_trailer(ofmt_ctx);
//end:
//
// avformat_close_input(&ifmt_ctx);
//
// /* close output */
// if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
// avio_closep(&ofmt_ctx->pb);
// avformat_free_context(ofmt_ctx);
//
// av_freep(&stream_mapping);
//
// if (ret < 0 && ret != AVERROR_EOF) {
// fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
// return 1;
// }
//
// return 0;
//}