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