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asfenc.c
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1 /*
2  * ASF muxer
3  * Copyright (c) 2000, 2001 Fabrice Bellard
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 #include "libavutil/avassert.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/mathematics.h"
25 #include "avformat.h"
26 #include "avio_internal.h"
27 #include "internal.h"
28 #include "riff.h"
29 #include "asf.h"
30 
31 #undef NDEBUG
32 #include <assert.h>
33 
34 
35 #define ASF_INDEXED_INTERVAL 10000000
36 #define ASF_INDEX_BLOCK (1<<9)
37 #define ASF_PAYLOADS_PER_PACKET 63
38 
39 #define ASF_PACKET_ERROR_CORRECTION_DATA_SIZE 0x2
40 #define ASF_PACKET_ERROR_CORRECTION_FLAGS \
41  (ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT | \
42  ASF_PACKET_ERROR_CORRECTION_DATA_SIZE)
43 
44 #if (ASF_PACKET_ERROR_CORRECTION_FLAGS != 0)
45 # define ASF_PACKET_ERROR_CORRECTION_FLAGS_FIELD_SIZE 1
46 #else
47 # define ASF_PACKET_ERROR_CORRECTION_FLAGS_FIELD_SIZE 0
48 #endif
49 
50 #define ASF_PPI_PROPERTY_FLAGS \
51  (ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_BYTE | \
52  ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_DWORD | \
53  ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_BYTE | \
54  ASF_PL_FLAG_STREAM_NUMBER_LENGTH_FIELD_IS_BYTE)
55 
56 #define ASF_PPI_LENGTH_TYPE_FLAGS 0
57 
58 #define ASF_PAYLOAD_FLAGS ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_WORD
59 
60 #if (ASF_PPI_FLAG_SEQUENCE_FIELD_IS_BYTE == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE))
61 # define ASF_PPI_SEQUENCE_FIELD_SIZE 1
62 #endif
63 #if (ASF_PPI_FLAG_SEQUENCE_FIELD_IS_WORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE))
64 # define ASF_PPI_SEQUENCE_FIELD_SIZE 2
65 #endif
66 #if (ASF_PPI_FLAG_SEQUENCE_FIELD_IS_DWORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE))
67 # define ASF_PPI_SEQUENCE_FIELD_SIZE 4
68 #endif
69 #ifndef ASF_PPI_SEQUENCE_FIELD_SIZE
70 # define ASF_PPI_SEQUENCE_FIELD_SIZE 0
71 #endif
72 
73 #if (ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_BYTE == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE))
74 # define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 1
75 #endif
76 #if (ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_WORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE))
77 # define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 2
78 #endif
79 #if (ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_DWORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE))
80 # define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 4
81 #endif
82 #ifndef ASF_PPI_PACKET_LENGTH_FIELD_SIZE
83 # define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 0
84 #endif
85 
86 #if (ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE))
87 # define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 1
88 #endif
89 #if (ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE))
90 # define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 2
91 #endif
92 #if (ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_DWORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE))
93 # define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 4
94 #endif
95 #ifndef ASF_PPI_PADDING_LENGTH_FIELD_SIZE
96 # define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 0
97 #endif
98 
99 #if (ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_BYTE == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE))
100 # define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 1
101 #endif
102 #if (ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_WORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE))
103 # define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 2
104 #endif
105 #if (ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_DWORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE))
106 # define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 4
107 #endif
108 #ifndef ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE
109 # define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 0
110 #endif
111 
112 #if (ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_BYTE == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE))
113 # define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 1
114 #endif
115 #if (ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_WORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE))
116 # define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 2
117 #endif
118 #if (ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_DWORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE))
119 # define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 4
120 #endif
121 #ifndef ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE
122 # define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 0
123 #endif
124 
125 #if (ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_BYTE == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE))
126 # define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 1
127 #endif
128 #if (ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_WORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE))
129 # define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 2
130 #endif
131 #if (ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_DWORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE))
132 # define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 4
133 #endif
134 #ifndef ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE
135 # define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 0
136 #endif
137 
138 #if (ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_BYTE == (ASF_PAYLOAD_FLAGS & ASF_PL_MASK_PAYLOAD_LENGTH_FIELD_SIZE))
139 # define ASF_PAYLOAD_LENGTH_FIELD_SIZE 1
140 #endif
141 #if (ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_WORD == (ASF_PAYLOAD_FLAGS & ASF_PL_MASK_PAYLOAD_LENGTH_FIELD_SIZE))
142 # define ASF_PAYLOAD_LENGTH_FIELD_SIZE 2
143 #endif
144 #ifndef ASF_PAYLOAD_LENGTH_FIELD_SIZE
145 # define ASF_PAYLOAD_LENGTH_FIELD_SIZE 0
146 #endif
147 
148 #define PACKET_HEADER_MIN_SIZE \
149  (ASF_PACKET_ERROR_CORRECTION_FLAGS_FIELD_SIZE + \
150  ASF_PACKET_ERROR_CORRECTION_DATA_SIZE + \
151  1 + /* Length Type Flags */ \
152  1 + /* Property Flags */ \
153  ASF_PPI_PACKET_LENGTH_FIELD_SIZE + \
154  ASF_PPI_SEQUENCE_FIELD_SIZE + \
155  ASF_PPI_PADDING_LENGTH_FIELD_SIZE + \
156  4 + /* Send Time Field */ \
157  2) /* Duration Field */
158 
159 // Replicated Data shall be at least 8 bytes long.
160 #define ASF_PAYLOAD_REPLICATED_DATA_LENGTH 0x08
161 
162 #define PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD \
163  (1 + /* Stream Number */ \
164  ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE + \
165  ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE + \
166  ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE + \
167  ASF_PAYLOAD_REPLICATED_DATA_LENGTH)
168 
169 #define PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS \
170  (1 + /* Stream Number */ \
171  ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE + \
172  ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE + \
173  ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE + \
174  ASF_PAYLOAD_REPLICATED_DATA_LENGTH + \
175  ASF_PAYLOAD_LENGTH_FIELD_SIZE)
176 
177 #define SINGLE_PAYLOAD_DATA_LENGTH \
178  (PACKET_SIZE - \
179  PACKET_HEADER_MIN_SIZE - \
180  PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD)
181 
182 #define MULTI_PAYLOAD_CONSTANT \
183  (PACKET_SIZE - \
184  PACKET_HEADER_MIN_SIZE - \
185  1 - /* Payload Flags */ \
186  2 * PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS)
187 
188 #define DATA_HEADER_SIZE 50
189 
190 typedef struct {
191  uint32_t seqno;
192  int is_streamed;
193  ASFStream streams[128]; ///< it's max number and it's not that big
194  /* non streamed additonnal info */
195  uint64_t nb_packets; ///< how many packets are there in the file, invalid if broadcasting
196  int64_t duration; ///< in 100ns units
197  /* packet filling */
198  unsigned char multi_payloads_present;
199  int packet_size_left;
200  int64_t packet_timestamp_start;
201  int64_t packet_timestamp_end;
202  unsigned int packet_nb_payloads;
203  uint8_t packet_buf[PACKET_SIZE];
204  AVIOContext pb;
205  /* only for reading */
206  uint64_t data_offset; ///< beginning of the first data packet
207 
208  ASFIndex *index_ptr;
209  uint32_t nb_index_memory_alloc;
210  uint16_t maximum_packet;
211  uint32_t next_packet_number;
212  uint16_t next_packet_count;
213  uint64_t next_packet_offset;
214  int next_start_sec;
215  int end_sec;
216 } ASFContext;
217 
218 static const AVCodecTag codec_asf_bmp_tags[] = {
219  { AV_CODEC_ID_MPEG4, MKTAG('M', '4', 'S', '2') },
220  { AV_CODEC_ID_MPEG4, MKTAG('M', 'P', '4', 'S') },
221  { AV_CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') },
222  { AV_CODEC_ID_NONE, 0 },
223 };
224 
225 #define PREROLL_TIME 3100
226 
227 static void put_str16(AVIOContext *s, const char *tag)
228 {
229  int len;
230  uint8_t *pb;
231  AVIOContext *dyn_buf;
232  if (avio_open_dyn_buf(&dyn_buf) < 0)
233  return;
234 
235  avio_put_str16le(dyn_buf, tag);
236  len = avio_close_dyn_buf(dyn_buf, &pb);
237  avio_wl16(s, len);
238  avio_write(s, pb, len);
239  av_freep(&pb);
240 }
241 
242 static int64_t put_header(AVIOContext *pb, const ff_asf_guid *g)
243 {
244  int64_t pos;
245 
246  pos = avio_tell(pb);
247  ff_put_guid(pb, g);
248  avio_wl64(pb, 24);
249  return pos;
250 }
251 
252 /* update header size */
253 static void end_header(AVIOContext *pb, int64_t pos)
254 {
255  int64_t pos1;
256 
257  pos1 = avio_tell(pb);
258  avio_seek(pb, pos + 16, SEEK_SET);
259  avio_wl64(pb, pos1 - pos);
260  avio_seek(pb, pos1, SEEK_SET);
261 }
262 
263 /* write an asf chunk (only used in streaming case) */
264 static void put_chunk(AVFormatContext *s, int type,
265  int payload_length, int flags)
266 {
267  ASFContext *asf = s->priv_data;
268  AVIOContext *pb = s->pb;
269  int length;
270 
271  length = payload_length + 8;
272  avio_wl16(pb, type);
273  avio_wl16(pb, length); // size
274  avio_wl32(pb, asf->seqno); // sequence number
275  avio_wl16(pb, flags); // unknown bytes
276  avio_wl16(pb, length); // size_confirm
277  asf->seqno++;
278 }
279 
280 /* convert from unix to windows time */
281 static int64_t unix_to_file_time(int ti)
282 {
283  int64_t t;
284 
285  t = ti * INT64_C(10000000);
286  t += INT64_C(116444736000000000);
287  return t;
288 }
289 
290 static int32_t get_send_time(ASFContext *asf, int64_t pres_time, uint64_t *offset)
291 {
292  int i;
293  int32_t send_time = 0;
294  *offset = asf->data_offset + DATA_HEADER_SIZE;
295  for (i = 0; i < asf->next_start_sec; i++) {
296  if (pres_time <= asf->index_ptr[i].send_time)
297  break;
298  send_time = asf->index_ptr[i].send_time;
299  *offset = asf->index_ptr[i].offset;
300  }
301 
302  return send_time / 10000;
303 }
304 
305 static int asf_write_markers(AVFormatContext *s)
306 {
307  ASFContext *asf = s->priv_data;
308  AVIOContext *pb = s->pb;
309  int i;
310  AVRational scale = {1, 10000000};
311  int64_t hpos = put_header(pb, &ff_asf_marker_header);
312 
313  ff_put_guid(pb, &ff_asf_reserved_4);// ASF spec mandates this reserved value
314  avio_wl32(pb, s->nb_chapters); // markers count
315  avio_wl16(pb, 0); // ASF spec mandates 0 for this
316  avio_wl16(pb, 0); // name length 0, no name given
317 
318  for (i = 0; i < s->nb_chapters; i++) {
319  AVChapter *c = s->chapters[i];
320  AVDictionaryEntry *t = av_dict_get(c->metadata, "title", NULL, 0);
321  int64_t pres_time = av_rescale_q(c->start, c->time_base, scale);
322  uint64_t offset;
323  int32_t send_time = get_send_time(asf, pres_time, &offset);
324  int len = 0;
325  uint8_t *buf;
326  AVIOContext *dyn_buf;
327  if (t) {
328  if (avio_open_dyn_buf(&dyn_buf) < 0)
329  return AVERROR(ENOMEM);
330  avio_put_str16le(dyn_buf, t->value);
331  len = avio_close_dyn_buf(dyn_buf, &buf);
332  }
333  avio_wl64(pb, offset); // offset of the packet with send_time
334  avio_wl64(pb, pres_time + PREROLL_TIME * 10000); // presentation time
335  avio_wl16(pb, 12 + len); // entry length
336  avio_wl32(pb, send_time); // send time
337  avio_wl32(pb, 0); // flags, should be 0
338  avio_wl32(pb, len / 2); // marker desc length in WCHARS!
339  if (t) {
340  avio_write(pb, buf, len); // marker desc
341  av_freep(&buf);
342  }
343  }
344  end_header(pb, hpos);
345  return 0;
346 }
347 
348 /* write the header (used two times if non streamed) */
349 static int asf_write_header1(AVFormatContext *s, int64_t file_size,
350  int64_t data_chunk_size)
351 {
352  ASFContext *asf = s->priv_data;
353  AVIOContext *pb = s->pb;
354  AVDictionaryEntry *tags[5];
355  int header_size, n, extra_size, extra_size2, wav_extra_size, file_time;
356  int has_title, has_aspect_ratio = 0;
357  int metadata_count;
358  AVCodecContext *enc;
359  int64_t header_offset, cur_pos, hpos;
360  int bit_rate;
361  int64_t duration;
362 
363  ff_metadata_conv(&s->metadata, ff_asf_metadata_conv, NULL);
364 
365  tags[0] = av_dict_get(s->metadata, "title", NULL, 0);
366  tags[1] = av_dict_get(s->metadata, "author", NULL, 0);
367  tags[2] = av_dict_get(s->metadata, "copyright", NULL, 0);
368  tags[3] = av_dict_get(s->metadata, "comment", NULL, 0);
369  tags[4] = av_dict_get(s->metadata, "rating", NULL, 0);
370 
371  duration = asf->duration + PREROLL_TIME * 10000;
372  has_title = tags[0] || tags[1] || tags[2] || tags[3] || tags[4];
373  metadata_count = av_dict_count(s->metadata);
374 
375  bit_rate = 0;
376  for (n = 0; n < s->nb_streams; n++) {
377  enc = s->streams[n]->codec;
378 
379  avpriv_set_pts_info(s->streams[n], 32, 1, 1000); /* 32 bit pts in ms */
380 
381  bit_rate += enc->bit_rate;
382  if ( enc->codec_type == AVMEDIA_TYPE_VIDEO
383  && enc->sample_aspect_ratio.num > 0
384  && enc->sample_aspect_ratio.den > 0)
385  has_aspect_ratio++;
386  }
387 
388  if (asf->is_streamed) {
389  put_chunk(s, 0x4824, 0, 0xc00); /* start of stream (length will be patched later) */
390  }
391 
392  ff_put_guid(pb, &ff_asf_header);
393  avio_wl64(pb, -1); /* header length, will be patched after */
394  avio_wl32(pb, 3 + has_title + !!metadata_count + s->nb_streams); /* number of chunks in header */
395  avio_w8(pb, 1); /* ??? */
396  avio_w8(pb, 2); /* ??? */
397 
398  /* file header */
399  header_offset = avio_tell(pb);
400  hpos = put_header(pb, &ff_asf_file_header);
401  ff_put_guid(pb, &ff_asf_my_guid);
402  avio_wl64(pb, file_size);
403  file_time = 0;
404  avio_wl64(pb, unix_to_file_time(file_time));
405  avio_wl64(pb, asf->nb_packets); /* number of packets */
406  avio_wl64(pb, duration); /* end time stamp (in 100ns units) */
407  avio_wl64(pb, asf->duration); /* duration (in 100ns units) */
408  avio_wl64(pb, PREROLL_TIME); /* start time stamp */
409  avio_wl32(pb, (asf->is_streamed || !pb->seekable) ? 3 : 2); /* ??? */
410  avio_wl32(pb, s->packet_size); /* packet size */
411  avio_wl32(pb, s->packet_size); /* packet size */
412  avio_wl32(pb, bit_rate ? bit_rate : -1); /* Maximum data rate in bps */
413  end_header(pb, hpos);
414 
415  /* unknown headers */
416  hpos = put_header(pb, &ff_asf_head1_guid);
417  ff_put_guid(pb, &ff_asf_head2_guid);
418  avio_wl16(pb, 6);
419  if (has_aspect_ratio) {
420  int64_t hpos2;
421  avio_wl32(pb, 26 + has_aspect_ratio * 84);
422  hpos2 = put_header(pb, &ff_asf_metadata_header);
423  avio_wl16(pb, 2 * has_aspect_ratio);
424  for (n = 0; n < s->nb_streams; n++) {
425  enc = s->streams[n]->codec;
426  if ( enc->codec_type == AVMEDIA_TYPE_VIDEO
427  && enc->sample_aspect_ratio.num > 0
428  && enc->sample_aspect_ratio.den > 0) {
429  AVRational sar = enc->sample_aspect_ratio;
430  avio_wl16(pb, 0);
431  // the stream number is set like this below
432  avio_wl16(pb, n + 1);
433  avio_wl16(pb, 26); // name_len
434  avio_wl16(pb, 3); // value_type
435  avio_wl32(pb, 4); // value_len
436  avio_put_str16le(pb, "AspectRatioX");
437  avio_wl32(pb, sar.num);
438  avio_wl16(pb, 0);
439  // the stream number is set like this below
440  avio_wl16(pb, n + 1);
441  avio_wl16(pb, 26); // name_len
442  avio_wl16(pb, 3); // value_type
443  avio_wl32(pb, 4); // value_len
444  avio_put_str16le(pb, "AspectRatioY");
445  avio_wl32(pb, sar.den);
446  }
447  }
448  end_header(pb, hpos2);
449  } else {
450  avio_wl32(pb, 0);
451  }
452  end_header(pb, hpos);
453 
454  /* title and other infos */
455  if (has_title) {
456  int len;
457  uint8_t *buf;
458  AVIOContext *dyn_buf;
459 
460  if (avio_open_dyn_buf(&dyn_buf) < 0)
461  return AVERROR(ENOMEM);
462 
463  hpos = put_header(pb, &ff_asf_comment_header);
464 
465  for (n = 0; n < FF_ARRAY_ELEMS(tags); n++) {
466  len = tags[n] ? avio_put_str16le(dyn_buf, tags[n]->value) : 0;
467  avio_wl16(pb, len);
468  }
469  len = avio_close_dyn_buf(dyn_buf, &buf);
470  avio_write(pb, buf, len);
471  av_freep(&buf);
472  end_header(pb, hpos);
473  }
474  if (metadata_count) {
475  AVDictionaryEntry *tag = NULL;
476  hpos = put_header(pb, &ff_asf_extended_content_header);
477  avio_wl16(pb, metadata_count);
478  while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
479  put_str16(pb, tag->key);
480  avio_wl16(pb, 0);
481  put_str16(pb, tag->value);
482  }
483  end_header(pb, hpos);
484  }
485  /* chapters using ASF markers */
486  if (!asf->is_streamed && s->nb_chapters) {
487  int ret;
488  if (ret = asf_write_markers(s))
489  return ret;
490  }
491  /* stream headers */
492  for (n = 0; n < s->nb_streams; n++) {
493  int64_t es_pos;
494  // ASFStream *stream = &asf->streams[n];
495 
496  enc = s->streams[n]->codec;
497  asf->streams[n].num = n + 1;
498  asf->streams[n].seq = 1;
499 
500  switch (enc->codec_type) {
501  case AVMEDIA_TYPE_AUDIO:
502  wav_extra_size = 0;
503  extra_size = 18 + wav_extra_size;
504  extra_size2 = 8;
505  break;
506  default:
507  case AVMEDIA_TYPE_VIDEO:
508  wav_extra_size = enc->extradata_size;
509  extra_size = 0x33 + wav_extra_size;
510  extra_size2 = 0;
511  break;
512  }
513 
514  hpos = put_header(pb, &ff_asf_stream_header);
515  if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
516  ff_put_guid(pb, &ff_asf_audio_stream);
517  ff_put_guid(pb, &ff_asf_audio_conceal_spread);
518  } else {
519  ff_put_guid(pb, &ff_asf_video_stream);
520  ff_put_guid(pb, &ff_asf_video_conceal_none);
521  }
522  avio_wl64(pb, 0); /* ??? */
523  es_pos = avio_tell(pb);
524  avio_wl32(pb, extra_size); /* wav header len */
525  avio_wl32(pb, extra_size2); /* additional data len */
526  avio_wl16(pb, n + 1); /* stream number */
527  avio_wl32(pb, 0); /* ??? */
528 
529  if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
530  /* WAVEFORMATEX header */
531  int wavsize = ff_put_wav_header(pb, enc, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
532 
533  if (wavsize < 0)
534  return -1;
535  if (wavsize != extra_size) {
536  cur_pos = avio_tell(pb);
537  avio_seek(pb, es_pos, SEEK_SET);
538  avio_wl32(pb, wavsize); /* wav header len */
539  avio_seek(pb, cur_pos, SEEK_SET);
540  }
541  /* ERROR Correction */
542  avio_w8(pb, 0x01);
543  if (enc->codec_id == AV_CODEC_ID_ADPCM_G726 || !enc->block_align) {
544  avio_wl16(pb, 0x0190);
545  avio_wl16(pb, 0x0190);
546  } else {
547  avio_wl16(pb, enc->block_align);
548  avio_wl16(pb, enc->block_align);
549  }
550  avio_wl16(pb, 0x01);
551  avio_w8(pb, 0x00);
552  } else {
553  avio_wl32(pb, enc->width);
554  avio_wl32(pb, enc->height);
555  avio_w8(pb, 2); /* ??? */
556  avio_wl16(pb, 40 + enc->extradata_size); /* size */
557 
558  /* BITMAPINFOHEADER header */
559  ff_put_bmp_header(pb, enc, ff_codec_bmp_tags, 1, 0);
560  }
561  end_header(pb, hpos);
562  }
563 
564  /* media comments */
565 
566  hpos = put_header(pb, &ff_asf_codec_comment_header);
567  ff_put_guid(pb, &ff_asf_codec_comment1_header);
568  avio_wl32(pb, s->nb_streams);
569  for (n = 0; n < s->nb_streams; n++) {
570  const AVCodecDescriptor *codec_desc;
571  const char *desc;
572 
573  enc = s->streams[n]->codec;
574  codec_desc = avcodec_descriptor_get(enc->codec_id);
575 
576  if (enc->codec_type == AVMEDIA_TYPE_AUDIO)
577  avio_wl16(pb, 2);
578  else if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
579  avio_wl16(pb, 1);
580  else
581  avio_wl16(pb, -1);
582 
583  if (enc->codec_id == AV_CODEC_ID_WMAV2)
584  desc = "Windows Media Audio V8";
585  else
586  desc = codec_desc ? codec_desc->name : NULL;
587 
588  if (desc) {
589  AVIOContext *dyn_buf;
590  uint8_t *buf;
591  int len;
592 
593  if (avio_open_dyn_buf(&dyn_buf) < 0)
594  return AVERROR(ENOMEM);
595 
596  avio_put_str16le(dyn_buf, desc);
597  len = avio_close_dyn_buf(dyn_buf, &buf);
598  avio_wl16(pb, len / 2); // "number of characters" = length in bytes / 2
599 
600  avio_write(pb, buf, len);
601  av_freep(&buf);
602  } else
603  avio_wl16(pb, 0);
604 
605  avio_wl16(pb, 0); /* no parameters */
606 
607  /* id */
608  if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
609  avio_wl16(pb, 2);
610  avio_wl16(pb, enc->codec_tag);
611  } else {
612  avio_wl16(pb, 4);
613  avio_wl32(pb, enc->codec_tag);
614  }
615  if (!enc->codec_tag)
616  return -1;
617  }
618  end_header(pb, hpos);
619 
620  /* patch the header size fields */
621 
622  cur_pos = avio_tell(pb);
623  header_size = cur_pos - header_offset;
624  if (asf->is_streamed) {
625  header_size += 8 + 30 + DATA_HEADER_SIZE;
626 
627  avio_seek(pb, header_offset - 10 - 30, SEEK_SET);
628  avio_wl16(pb, header_size);
629  avio_seek(pb, header_offset - 2 - 30, SEEK_SET);
630  avio_wl16(pb, header_size);
631 
632  header_size -= 8 + 30 + DATA_HEADER_SIZE;
633  }
634  header_size += 24 + 6;
635  avio_seek(pb, header_offset - 14, SEEK_SET);
636  avio_wl64(pb, header_size);
637  avio_seek(pb, cur_pos, SEEK_SET);
638 
639  /* movie chunk, followed by packets of packet_size */
640  asf->data_offset = cur_pos;
641  ff_put_guid(pb, &ff_asf_data_header);
642  avio_wl64(pb, data_chunk_size);
643  ff_put_guid(pb, &ff_asf_my_guid);
644  avio_wl64(pb, asf->nb_packets); /* nb packets */
645  avio_w8(pb, 1); /* ??? */
646  avio_w8(pb, 1); /* ??? */
647  return 0;
648 }
649 
650 static int asf_write_header(AVFormatContext *s)
651 {
652  ASFContext *asf = s->priv_data;
653 
654  s->packet_size = PACKET_SIZE;
655  s->max_interleave_delta = 0;
656  asf->nb_packets = 0;
657 
658  asf->index_ptr = av_malloc(sizeof(ASFIndex) * ASF_INDEX_BLOCK);
659  asf->nb_index_memory_alloc = ASF_INDEX_BLOCK;
660  asf->maximum_packet = 0;
661 
662  /* the data-chunk-size has to be 50 (DATA_HEADER_SIZE), which is
663  * data_size - asf->data_offset at the moment this function is done.
664  * It is needed to use asf as a streamable format. */
665  if (asf_write_header1(s, 0, DATA_HEADER_SIZE) < 0) {
666  //av_free(asf);
667  return -1;
668  }
669 
670  avio_flush(s->pb);
671 
672  asf->packet_nb_payloads = 0;
673  asf->packet_timestamp_start = -1;
674  asf->packet_timestamp_end = -1;
675  ffio_init_context(&asf->pb, asf->packet_buf, s->packet_size, 1,
676  NULL, NULL, NULL, NULL);
677 
678  if (s->avoid_negative_ts < 0)
679  s->avoid_negative_ts = 1;
680 
681  return 0;
682 }
683 
684 static int asf_write_stream_header(AVFormatContext *s)
685 {
686  ASFContext *asf = s->priv_data;
687 
688  asf->is_streamed = 1;
689 
690  return asf_write_header(s);
691 }
692 
693 static int put_payload_parsing_info(AVFormatContext *s,
694  unsigned sendtime, unsigned duration,
695  int nb_payloads, int padsize)
696 {
697  ASFContext *asf = s->priv_data;
698  AVIOContext *pb = s->pb;
699  int ppi_size, i;
700  int64_t start = avio_tell(pb);
701 
702  int iLengthTypeFlags = ASF_PPI_LENGTH_TYPE_FLAGS;
703 
704  padsize -= PACKET_HEADER_MIN_SIZE;
705  if (asf->multi_payloads_present)
706  padsize--;
707  av_assert0(padsize >= 0);
708 
709  avio_w8(pb, ASF_PACKET_ERROR_CORRECTION_FLAGS);
710  for (i = 0; i < ASF_PACKET_ERROR_CORRECTION_DATA_SIZE; i++)
711  avio_w8(pb, 0x0);
712 
713  if (asf->multi_payloads_present)
714  iLengthTypeFlags |= ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT;
715 
716  if (padsize > 0) {
717  if (padsize < 256)
718  iLengthTypeFlags |= ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE;
719  else
720  iLengthTypeFlags |= ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD;
721  }
722  avio_w8(pb, iLengthTypeFlags);
723 
724  avio_w8(pb, ASF_PPI_PROPERTY_FLAGS);
725 
726  if (iLengthTypeFlags & ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD)
727  avio_wl16(pb, padsize - 2);
728  if (iLengthTypeFlags & ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE)
729  avio_w8(pb, padsize - 1);
730 
731  avio_wl32(pb, sendtime);
732  avio_wl16(pb, duration);
733  if (asf->multi_payloads_present)
734  avio_w8(pb, nb_payloads | ASF_PAYLOAD_FLAGS);
735 
736  ppi_size = avio_tell(pb) - start;
737 
738  return ppi_size;
739 }
740 
741 static void flush_packet(AVFormatContext *s)
742 {
743  ASFContext *asf = s->priv_data;
744  int packet_hdr_size, packet_filled_size;
745 
746  av_assert0(asf->packet_timestamp_end >= asf->packet_timestamp_start);
747 
748  if (asf->is_streamed)
749  put_chunk(s, 0x4424, s->packet_size, 0);
750 
751  packet_hdr_size = put_payload_parsing_info(s,
752  asf->packet_timestamp_start,
753  asf->packet_timestamp_end - asf->packet_timestamp_start,
754  asf->packet_nb_payloads,
755  asf->packet_size_left);
756 
757  packet_filled_size = PACKET_SIZE - asf->packet_size_left;
758  av_assert0(packet_hdr_size <= asf->packet_size_left);
759  memset(asf->packet_buf + packet_filled_size, 0, asf->packet_size_left);
760 
761  avio_write(s->pb, asf->packet_buf, s->packet_size - packet_hdr_size);
762 
763  avio_flush(s->pb);
764  asf->nb_packets++;
765  asf->packet_nb_payloads = 0;
766  asf->packet_timestamp_start = -1;
767  asf->packet_timestamp_end = -1;
768  ffio_init_context(&asf->pb, asf->packet_buf, s->packet_size, 1,
769  NULL, NULL, NULL, NULL);
770 }
771 
772 static void put_payload_header(AVFormatContext *s, ASFStream *stream,
773  int64_t presentation_time, int m_obj_size,
774  int m_obj_offset, int payload_len, int flags)
775 {
776  ASFContext *asf = s->priv_data;
777  AVIOContext *pb = &asf->pb;
778  int val;
779 
780  val = stream->num;
781  if (flags & AV_PKT_FLAG_KEY)
782  val |= ASF_PL_FLAG_KEY_FRAME;
783  avio_w8(pb, val);
784 
785  avio_w8(pb, stream->seq); // Media object number
786  avio_wl32(pb, m_obj_offset); // Offset Into Media Object
787 
788  // Replicated Data shall be at least 8 bytes long.
789  // The first 4 bytes of data shall contain the
790  // Size of the Media Object that the payload belongs to.
791  // The next 4 bytes of data shall contain the
792  // Presentation Time for the media object that the payload belongs to.
793  avio_w8(pb, ASF_PAYLOAD_REPLICATED_DATA_LENGTH);
794 
795  avio_wl32(pb, m_obj_size); // Replicated Data - Media Object Size
796  avio_wl32(pb, (uint32_t) presentation_time); // Replicated Data - Presentation Time
797 
798  if (asf->multi_payloads_present) {
799  avio_wl16(pb, payload_len); // payload length
800  }
801 }
802 
803 static void put_frame(AVFormatContext *s, ASFStream *stream, AVStream *avst,
804  int64_t timestamp, const uint8_t *buf,
805  int m_obj_size, int flags)
806 {
807  ASFContext *asf = s->priv_data;
808  int m_obj_offset, payload_len, frag_len1;
809 
810  m_obj_offset = 0;
811  while (m_obj_offset < m_obj_size) {
812  payload_len = m_obj_size - m_obj_offset;
813  if (asf->packet_timestamp_start == -1) {
814  asf->multi_payloads_present = (payload_len < MULTI_PAYLOAD_CONSTANT);
815 
816  asf->packet_size_left = PACKET_SIZE;
817  if (asf->multi_payloads_present) {
818  frag_len1 = MULTI_PAYLOAD_CONSTANT - 1;
819  } else {
820  frag_len1 = SINGLE_PAYLOAD_DATA_LENGTH;
821  }
822  asf->packet_timestamp_start = timestamp;
823  } else {
824  // multi payloads
825  frag_len1 = asf->packet_size_left -
826  PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS -
827  PACKET_HEADER_MIN_SIZE - 1;
828 
829  if (frag_len1 < payload_len &&
830  avst->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
831  flush_packet(s);
832  continue;
833  }
834  }
835  if (frag_len1 > 0) {
836  if (payload_len > frag_len1)
837  payload_len = frag_len1;
838  else if (payload_len == (frag_len1 - 1))
839  payload_len = frag_len1 - 2; // additional byte need to put padding length
840 
841  put_payload_header(s, stream, timestamp + PREROLL_TIME,
842  m_obj_size, m_obj_offset, payload_len, flags);
843  avio_write(&asf->pb, buf, payload_len);
844 
845  if (asf->multi_payloads_present)
846  asf->packet_size_left -= (payload_len + PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS);
847  else
848  asf->packet_size_left -= (payload_len + PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD);
849  asf->packet_timestamp_end = timestamp;
850 
851  asf->packet_nb_payloads++;
852  } else {
853  payload_len = 0;
854  }
855  m_obj_offset += payload_len;
856  buf += payload_len;
857 
858  if (!asf->multi_payloads_present)
859  flush_packet(s);
860  else if (asf->packet_size_left <= (PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS + PACKET_HEADER_MIN_SIZE + 1))
861  flush_packet(s);
862  else if (asf->packet_nb_payloads == ASF_PAYLOADS_PER_PACKET)
863  flush_packet(s);
864  }
865  stream->seq++;
866 }
867 
868 static int update_index(AVFormatContext *s, int start_sec,
869  uint32_t packet_number, uint16_t packet_count,
870  uint64_t packet_offset)
871 {
872  ASFContext *asf = s->priv_data;
873 
874  if (start_sec > asf->next_start_sec) {
875  int i;
876 
877  if (!asf->next_start_sec) {
878  asf->next_packet_number = packet_number;
879  asf->next_packet_count = packet_count;
880  asf->next_packet_offset = packet_offset;
881  }
882 
883  if (start_sec > asf->nb_index_memory_alloc) {
884  int err;
885  asf->nb_index_memory_alloc = (start_sec + ASF_INDEX_BLOCK) & ~(ASF_INDEX_BLOCK - 1);
886  if ((err = av_reallocp_array(&asf->index_ptr,
887  asf->nb_index_memory_alloc,
888  sizeof(*asf->index_ptr))) < 0) {
889  asf->nb_index_memory_alloc = 0;
890  return err;
891  }
892  }
893  for (i = asf->next_start_sec; i < start_sec; i++) {
894  asf->index_ptr[i].packet_number = asf->next_packet_number;
895  asf->index_ptr[i].packet_count = asf->next_packet_count;
896  asf->index_ptr[i].send_time = asf->next_start_sec * INT64_C(10000000);
897  asf->index_ptr[i].offset = asf->next_packet_offset;
898 
899  }
900  }
901  asf->maximum_packet = FFMAX(asf->maximum_packet, packet_count);
902  asf->next_packet_number = packet_number;
903  asf->next_packet_count = packet_count;
904  asf->next_packet_offset = packet_offset;
905  asf->next_start_sec = start_sec;
906 
907  return 0;
908 }
909 
910 static int asf_write_packet(AVFormatContext *s, AVPacket *pkt)
911 {
912  ASFContext *asf = s->priv_data;
913  AVIOContext *pb = s->pb;
914  ASFStream *stream;
915  AVCodecContext *codec;
916  uint32_t packet_number;
917  int64_t pts;
918  int start_sec;
919  int flags = pkt->flags;
920  int ret;
921  uint64_t offset = avio_tell(pb);
922 
923  codec = s->streams[pkt->stream_index]->codec;
924  stream = &asf->streams[pkt->stream_index];
925 
926  if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
927  flags &= ~AV_PKT_FLAG_KEY;
928 
929  pts = (pkt->pts != AV_NOPTS_VALUE) ? pkt->pts : pkt->dts;
930  av_assert0(pts != AV_NOPTS_VALUE);
931  pts *= 10000;
932  asf->duration = FFMAX(asf->duration, pts + pkt->duration * 10000);
933 
934  packet_number = asf->nb_packets;
935  put_frame(s, stream, s->streams[pkt->stream_index],
936  pkt->dts, pkt->data, pkt->size, flags);
937 
938  start_sec = (int)((PREROLL_TIME * 10000 + pts + ASF_INDEXED_INTERVAL - 1)
939  / ASF_INDEXED_INTERVAL);
940 
941  /* check index */
942  if ((!asf->is_streamed) && (flags & AV_PKT_FLAG_KEY)) {
943  uint16_t packet_count = asf->nb_packets - packet_number;
944  ret = update_index(s, start_sec, packet_number, packet_count, offset);
945  if (ret < 0)
946  return ret;
947  }
948  asf->end_sec = start_sec;
949 
950  return 0;
951 }
952 
953 static int asf_write_index(AVFormatContext *s, ASFIndex *index,
954  uint16_t max, uint32_t count)
955 {
956  AVIOContext *pb = s->pb;
957  int i;
958 
959  ff_put_guid(pb, &ff_asf_simple_index_header);
960  avio_wl64(pb, 24 + 16 + 8 + 4 + 4 + (4 + 2) * count);
961  ff_put_guid(pb, &ff_asf_my_guid);
962  avio_wl64(pb, ASF_INDEXED_INTERVAL);
963  avio_wl32(pb, max);
964  avio_wl32(pb, count);
965  for (i = 0; i < count; i++) {
966  avio_wl32(pb, index[i].packet_number);
967  avio_wl16(pb, index[i].packet_count);
968  }
969 
970  return 0;
971 }
972 
973 static int asf_write_trailer(AVFormatContext *s)
974 {
975  ASFContext *asf = s->priv_data;
976  int64_t file_size, data_size;
977  int ret;
978 
979  /* flush the current packet */
980  if (asf->pb.buf_ptr > asf->pb.buffer)
981  flush_packet(s);
982 
983  /* write index */
984  data_size = avio_tell(s->pb);
985  if (!asf->is_streamed && asf->next_start_sec) {
986  if ((ret = update_index(s, asf->end_sec + 1, 0, 0, 0)) < 0)
987  return ret;
988  asf_write_index(s, asf->index_ptr, asf->maximum_packet, asf->next_start_sec);
989  }
990  avio_flush(s->pb);
991 
992  if (asf->is_streamed || !s->pb->seekable) {
993  put_chunk(s, 0x4524, 0, 0); /* end of stream */
994  } else {
995  /* rewrite an updated header */
996  file_size = avio_tell(s->pb);
997  avio_seek(s->pb, 0, SEEK_SET);
998  asf_write_header1(s, file_size, data_size - asf->data_offset);
999  }
1000 
1001  av_freep(&asf->index_ptr);
1002  return 0;
1003 }
1004 
1005 #if CONFIG_ASF_MUXER
1006 AVOutputFormat ff_asf_muxer = {
1007  .name = "asf",
1008  .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1009  .mime_type = "video/x-ms-asf",
1010  .extensions = "asf,wmv,wma",
1011  .priv_data_size = sizeof(ASFContext),
1012  .audio_codec = AV_CODEC_ID_WMAV2,
1013  .video_codec = AV_CODEC_ID_MSMPEG4V3,
1014  .write_header = asf_write_header,
1015  .write_packet = asf_write_packet,
1016  .write_trailer = asf_write_trailer,
1017  .flags = AVFMT_GLOBALHEADER,
1018  .codec_tag = (const AVCodecTag * const []) {
1019  codec_asf_bmp_tags, ff_codec_bmp_tags, ff_codec_wav_tags, 0
1020  },
1021 };
1022 #endif /* CONFIG_ASF_MUXER */
1023 
1024 #if CONFIG_ASF_STREAM_MUXER
1025 AVOutputFormat ff_asf_stream_muxer = {
1026  .name = "asf_stream",
1027  .long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
1028  .mime_type = "video/x-ms-asf",
1029  .extensions = "asf,wmv,wma",
1030  .priv_data_size = sizeof(ASFContext),
1031  .audio_codec = AV_CODEC_ID_WMAV2,
1032  .video_codec = AV_CODEC_ID_MSMPEG4V3,
1033  .write_header = asf_write_stream_header,
1034  .write_packet = asf_write_packet,
1035  .write_trailer = asf_write_trailer,
1036  .flags = AVFMT_GLOBALHEADER,
1037  .codec_tag = (const AVCodecTag * const []) {
1038  codec_asf_bmp_tags, ff_codec_bmp_tags, ff_codec_wav_tags, 0
1039  },
1040 };
1041 #endif /* CONFIG_ASF_STREAM_MUXER */
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