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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. void ff_put_guid(AVIOContext *s, const ff_asf_guid *g)
  227. {
  228.     av_assert0(sizeof(*g) == 16);
  229.     avio_write(s, *g, sizeof(*g));
  230. }
  231.  
  232. static void put_str16(AVIOContext *s, const char *tag)
  233. {
  234.     int len;
  235.     uint8_t *pb;
  236.     AVIOContext *dyn_buf;
  237.     if (avio_open_dyn_buf(&dyn_buf) < 0)
  238.         return;
  239.  
  240.     avio_put_str16le(dyn_buf, tag);
  241.     len = avio_close_dyn_buf(dyn_buf, &pb);
  242.     avio_wl16(s, len);
  243.     avio_write(s, pb, len);
  244.     av_freep(&pb);
  245. }
  246.  
  247. static int64_t put_header(AVIOContext *pb, const ff_asf_guid *g)
  248. {
  249.     int64_t pos;
  250.  
  251.     pos = avio_tell(pb);
  252.     ff_put_guid(pb, g);
  253.     avio_wl64(pb, 24);
  254.     return pos;
  255. }
  256.  
  257. /* update header size */
  258. static void end_header(AVIOContext *pb, int64_t pos)
  259. {
  260.     int64_t pos1;
  261.  
  262.     pos1 = avio_tell(pb);
  263.     avio_seek(pb, pos + 16, SEEK_SET);
  264.     avio_wl64(pb, pos1 - pos);
  265.     avio_seek(pb, pos1, SEEK_SET);
  266. }
  267.  
  268. /* write an asf chunk (only used in streaming case) */
  269. static void put_chunk(AVFormatContext *s, int type,
  270.                       int payload_length, int flags)
  271. {
  272.     ASFContext *asf = s->priv_data;
  273.     AVIOContext *pb = s->pb;
  274.     int length;
  275.  
  276.     length = payload_length + 8;
  277.     avio_wl16(pb, type);
  278.     avio_wl16(pb, length);      // size
  279.     avio_wl32(pb, asf->seqno);  // sequence number
  280.     avio_wl16(pb, flags);       // unknown bytes
  281.     avio_wl16(pb, length);      // size_confirm
  282.     asf->seqno++;
  283. }
  284.  
  285. /* convert from unix to windows time */
  286. static int64_t unix_to_file_time(int ti)
  287. {
  288.     int64_t t;
  289.  
  290.     t  = ti * INT64_C(10000000);
  291.     t += INT64_C(116444736000000000);
  292.     return t;
  293. }
  294.  
  295. static int32_t get_send_time(ASFContext *asf, int64_t pres_time, uint64_t *offset)
  296. {
  297.     int i;
  298.     int32_t send_time = 0;
  299.     *offset = asf->data_offset + DATA_HEADER_SIZE;
  300.     for (i = 0; i < asf->next_start_sec; i++) {
  301.         if (pres_time <= asf->index_ptr[i].send_time)
  302.             break;
  303.         send_time = asf->index_ptr[i].send_time;
  304.         *offset   = asf->index_ptr[i].offset;
  305.     }
  306.  
  307.     return send_time / 10000;
  308. }
  309.  
  310. static int asf_write_markers(AVFormatContext *s)
  311. {
  312.     ASFContext *asf = s->priv_data;
  313.     AVIOContext *pb = s->pb;
  314.     int i;
  315.     AVRational scale = {1, 10000000};
  316.     int64_t hpos = put_header(pb, &ff_asf_marker_header);
  317.  
  318.     ff_put_guid(pb, &ff_asf_reserved_4);// ASF spec mandates this reserved value
  319.     avio_wl32(pb, s->nb_chapters);     // markers count
  320.     avio_wl16(pb, 0);                  // ASF spec mandates 0 for this
  321.     avio_wl16(pb, 0);                  // name length 0, no name given
  322.  
  323.     for (i = 0; i < s->nb_chapters; i++) {
  324.         AVChapter *c = s->chapters[i];
  325.         AVDictionaryEntry *t = av_dict_get(c->metadata, "title", NULL, 0);
  326.         int64_t pres_time = av_rescale_q(c->start, c->time_base, scale);
  327.         uint64_t offset;
  328.         int32_t send_time = get_send_time(asf, pres_time, &offset);
  329.         int len = 0;
  330.         uint8_t *buf;
  331.         AVIOContext *dyn_buf;
  332.         if (t) {
  333.             if (avio_open_dyn_buf(&dyn_buf) < 0)
  334.                 return AVERROR(ENOMEM);
  335.             avio_put_str16le(dyn_buf, t->value);
  336.             len = avio_close_dyn_buf(dyn_buf, &buf);
  337.         }
  338.         avio_wl64(pb, offset);            // offset of the packet with send_time
  339.         avio_wl64(pb, pres_time + PREROLL_TIME * 10000); // presentation time
  340.         avio_wl16(pb, 12 + len);          // entry length
  341.         avio_wl32(pb, send_time);         // send time
  342.         avio_wl32(pb, 0);                 // flags, should be 0
  343.         avio_wl32(pb, len / 2);           // marker desc length in WCHARS!
  344.         if (t) {
  345.             avio_write(pb, buf, len);     // marker desc
  346.             av_freep(&buf);
  347.         }
  348.     }
  349.     end_header(pb, hpos);
  350.     return 0;
  351. }
  352.  
  353. /* write the header (used two times if non streamed) */
  354. static int asf_write_header1(AVFormatContext *s, int64_t file_size,
  355.                              int64_t data_chunk_size)
  356. {
  357.     ASFContext *asf = s->priv_data;
  358.     AVIOContext *pb = s->pb;
  359.     AVDictionaryEntry *tags[5];
  360.     int header_size, n, extra_size, extra_size2, wav_extra_size, file_time;
  361.     int has_title;
  362.     int metadata_count;
  363.     AVCodecContext *enc;
  364.     int64_t header_offset, cur_pos, hpos;
  365.     int bit_rate;
  366.     int64_t duration;
  367.  
  368.     ff_metadata_conv(&s->metadata, ff_asf_metadata_conv, NULL);
  369.  
  370.     tags[0] = av_dict_get(s->metadata, "title", NULL, 0);
  371.     tags[1] = av_dict_get(s->metadata, "author", NULL, 0);
  372.     tags[2] = av_dict_get(s->metadata, "copyright", NULL, 0);
  373.     tags[3] = av_dict_get(s->metadata, "comment", NULL, 0);
  374.     tags[4] = av_dict_get(s->metadata, "rating", NULL, 0);
  375.  
  376.     duration       = asf->duration + PREROLL_TIME * 10000;
  377.     has_title      = tags[0] || tags[1] || tags[2] || tags[3] || tags[4];
  378.     metadata_count = av_dict_count(s->metadata);
  379.  
  380.     bit_rate = 0;
  381.     for (n = 0; n < s->nb_streams; n++) {
  382.         enc = s->streams[n]->codec;
  383.  
  384.         avpriv_set_pts_info(s->streams[n], 32, 1, 1000); /* 32 bit pts in ms */
  385.  
  386.         bit_rate += enc->bit_rate;
  387.     }
  388.  
  389.     if (asf->is_streamed) {
  390.         put_chunk(s, 0x4824, 0, 0xc00); /* start of stream (length will be patched later) */
  391.     }
  392.  
  393.     ff_put_guid(pb, &ff_asf_header);
  394.     avio_wl64(pb, -1); /* header length, will be patched after */
  395.     avio_wl32(pb, 3 + has_title + !!metadata_count + s->nb_streams); /* number of chunks in header */
  396.     avio_w8(pb, 1); /* ??? */
  397.     avio_w8(pb, 2); /* ??? */
  398.  
  399.     /* file header */
  400.     header_offset = avio_tell(pb);
  401.     hpos          = put_header(pb, &ff_asf_file_header);
  402.     ff_put_guid(pb, &ff_asf_my_guid);
  403.     avio_wl64(pb, file_size);
  404.     file_time = 0;
  405.     avio_wl64(pb, unix_to_file_time(file_time));
  406.     avio_wl64(pb, asf->nb_packets); /* number of packets */
  407.     avio_wl64(pb, duration); /* end time stamp (in 100ns units) */
  408.     avio_wl64(pb, asf->duration); /* duration (in 100ns units) */
  409.     avio_wl64(pb, PREROLL_TIME); /* start time stamp */
  410.     avio_wl32(pb, (asf->is_streamed || !pb->seekable) ? 3 : 2);  /* ??? */
  411.     avio_wl32(pb, s->packet_size); /* packet size */
  412.     avio_wl32(pb, s->packet_size); /* packet size */
  413.     avio_wl32(pb, bit_rate); /* Nominal data rate in bps */
  414.     end_header(pb, hpos);
  415.  
  416.     /* unknown headers */
  417.     hpos = put_header(pb, &ff_asf_head1_guid);
  418.     ff_put_guid(pb, &ff_asf_head2_guid);
  419.     avio_wl32(pb, 6);
  420.     avio_wl16(pb, 0);
  421.     end_header(pb, hpos);
  422.  
  423.     /* title and other infos */
  424.     if (has_title) {
  425.         int len;
  426.         uint8_t *buf;
  427.         AVIOContext *dyn_buf;
  428.  
  429.         if (avio_open_dyn_buf(&dyn_buf) < 0)
  430.             return AVERROR(ENOMEM);
  431.  
  432.         hpos = put_header(pb, &ff_asf_comment_header);
  433.  
  434.         for (n = 0; n < FF_ARRAY_ELEMS(tags); n++) {
  435.             len = tags[n] ? avio_put_str16le(dyn_buf, tags[n]->value) : 0;
  436.             avio_wl16(pb, len);
  437.         }
  438.         len = avio_close_dyn_buf(dyn_buf, &buf);
  439.         avio_write(pb, buf, len);
  440.         av_freep(&buf);
  441.         end_header(pb, hpos);
  442.     }
  443.     if (metadata_count) {
  444.         AVDictionaryEntry *tag = NULL;
  445.         hpos = put_header(pb, &ff_asf_extended_content_header);
  446.         avio_wl16(pb, metadata_count);
  447.         while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
  448.             put_str16(pb, tag->key);
  449.             avio_wl16(pb, 0);
  450.             put_str16(pb, tag->value);
  451.         }
  452.         end_header(pb, hpos);
  453.     }
  454.     /* chapters using ASF markers */
  455.     if (!asf->is_streamed && s->nb_chapters) {
  456.         int ret;
  457.         if (ret = asf_write_markers(s))
  458.             return ret;
  459.     }
  460.     /* stream headers */
  461.     for (n = 0; n < s->nb_streams; n++) {
  462.         int64_t es_pos;
  463.         //        ASFStream *stream = &asf->streams[n];
  464.  
  465.         enc                 = s->streams[n]->codec;
  466.         asf->streams[n].num = n + 1;
  467.         asf->streams[n].seq = 1;
  468.  
  469.         switch (enc->codec_type) {
  470.         case AVMEDIA_TYPE_AUDIO:
  471.             wav_extra_size = 0;
  472.             extra_size     = 18 + wav_extra_size;
  473.             extra_size2    = 8;
  474.             break;
  475.         default:
  476.         case AVMEDIA_TYPE_VIDEO:
  477.             wav_extra_size = enc->extradata_size;
  478.             extra_size     = 0x33 + wav_extra_size;
  479.             extra_size2    = 0;
  480.             break;
  481.         }
  482.  
  483.         hpos = put_header(pb, &ff_asf_stream_header);
  484.         if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
  485.             ff_put_guid(pb, &ff_asf_audio_stream);
  486.             ff_put_guid(pb, &ff_asf_audio_conceal_spread);
  487.         } else {
  488.             ff_put_guid(pb, &ff_asf_video_stream);
  489.             ff_put_guid(pb, &ff_asf_video_conceal_none);
  490.         }
  491.         avio_wl64(pb, 0); /* ??? */
  492.         es_pos = avio_tell(pb);
  493.         avio_wl32(pb, extra_size); /* wav header len */
  494.         avio_wl32(pb, extra_size2); /* additional data len */
  495.         avio_wl16(pb, n + 1); /* stream number */
  496.         avio_wl32(pb, 0); /* ??? */
  497.  
  498.         if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
  499.             /* WAVEFORMATEX header */
  500.             int wavsize = ff_put_wav_header(pb, enc);
  501.  
  502.             if (wavsize < 0)
  503.                 return -1;
  504.             if (wavsize != extra_size) {
  505.                 cur_pos = avio_tell(pb);
  506.                 avio_seek(pb, es_pos, SEEK_SET);
  507.                 avio_wl32(pb, wavsize); /* wav header len */
  508.                 avio_seek(pb, cur_pos, SEEK_SET);
  509.             }
  510.             /* ERROR Correction */
  511.             avio_w8(pb, 0x01);
  512.             if (enc->codec_id == AV_CODEC_ID_ADPCM_G726 || !enc->block_align) {
  513.                 avio_wl16(pb, 0x0190);
  514.                 avio_wl16(pb, 0x0190);
  515.             } else {
  516.                 avio_wl16(pb, enc->block_align);
  517.                 avio_wl16(pb, enc->block_align);
  518.             }
  519.             avio_wl16(pb, 0x01);
  520.             avio_w8(pb, 0x00);
  521.         } else {
  522.             avio_wl32(pb, enc->width);
  523.             avio_wl32(pb, enc->height);
  524.             avio_w8(pb, 2); /* ??? */
  525.             avio_wl16(pb, 40 + enc->extradata_size); /* size */
  526.  
  527.             /* BITMAPINFOHEADER header */
  528.             ff_put_bmp_header(pb, enc, ff_codec_bmp_tags, 1);
  529.         }
  530.         end_header(pb, hpos);
  531.     }
  532.  
  533.     /* media comments */
  534.  
  535.     hpos = put_header(pb, &ff_asf_codec_comment_header);
  536.     ff_put_guid(pb, &ff_asf_codec_comment1_header);
  537.     avio_wl32(pb, s->nb_streams);
  538.     for (n = 0; n < s->nb_streams; n++) {
  539.         AVCodec *p;
  540.         const char *desc;
  541.         int len;
  542.         uint8_t *buf;
  543.         AVIOContext *dyn_buf;
  544.  
  545.         enc = s->streams[n]->codec;
  546.         p   = avcodec_find_encoder(enc->codec_id);
  547.  
  548.         if (enc->codec_type == AVMEDIA_TYPE_AUDIO)
  549.             avio_wl16(pb, 2);
  550.         else if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
  551.             avio_wl16(pb, 1);
  552.         else
  553.             avio_wl16(pb, -1);
  554.  
  555.         if (enc->codec_id == AV_CODEC_ID_WMAV2)
  556.             desc = "Windows Media Audio V8";
  557.         else
  558.             desc = p ? p->name : enc->codec_name;
  559.  
  560.         if (avio_open_dyn_buf(&dyn_buf) < 0)
  561.             return AVERROR(ENOMEM);
  562.  
  563.         avio_put_str16le(dyn_buf, desc);
  564.         len = avio_close_dyn_buf(dyn_buf, &buf);
  565.         avio_wl16(pb, len / 2); // "number of characters" = length in bytes / 2
  566.  
  567.         avio_write(pb, buf, len);
  568.         av_freep(&buf);
  569.  
  570.         avio_wl16(pb, 0); /* no parameters */
  571.  
  572.         /* id */
  573.         if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
  574.             avio_wl16(pb, 2);
  575.             avio_wl16(pb, enc->codec_tag);
  576.         } else {
  577.             avio_wl16(pb, 4);
  578.             avio_wl32(pb, enc->codec_tag);
  579.         }
  580.         if (!enc->codec_tag)
  581.             return -1;
  582.     }
  583.     end_header(pb, hpos);
  584.  
  585.     /* patch the header size fields */
  586.  
  587.     cur_pos     = avio_tell(pb);
  588.     header_size = cur_pos - header_offset;
  589.     if (asf->is_streamed) {
  590.         header_size += 8 + 30 + DATA_HEADER_SIZE;
  591.  
  592.         avio_seek(pb, header_offset - 10 - 30, SEEK_SET);
  593.         avio_wl16(pb, header_size);
  594.         avio_seek(pb, header_offset - 2 - 30, SEEK_SET);
  595.         avio_wl16(pb, header_size);
  596.  
  597.         header_size -= 8 + 30 + DATA_HEADER_SIZE;
  598.     }
  599.     header_size += 24 + 6;
  600.     avio_seek(pb, header_offset - 14, SEEK_SET);
  601.     avio_wl64(pb, header_size);
  602.     avio_seek(pb, cur_pos, SEEK_SET);
  603.  
  604.     /* movie chunk, followed by packets of packet_size */
  605.     asf->data_offset = cur_pos;
  606.     ff_put_guid(pb, &ff_asf_data_header);
  607.     avio_wl64(pb, data_chunk_size);
  608.     ff_put_guid(pb, &ff_asf_my_guid);
  609.     avio_wl64(pb, asf->nb_packets); /* nb packets */
  610.     avio_w8(pb, 1); /* ??? */
  611.     avio_w8(pb, 1); /* ??? */
  612.     return 0;
  613. }
  614.  
  615. static int asf_write_header(AVFormatContext *s)
  616. {
  617.     ASFContext *asf = s->priv_data;
  618.  
  619.     s->packet_size  = PACKET_SIZE;
  620.     asf->nb_packets = 0;
  621.  
  622.     asf->index_ptr             = av_malloc(sizeof(ASFIndex) * ASF_INDEX_BLOCK);
  623.     asf->nb_index_memory_alloc = ASF_INDEX_BLOCK;
  624.     asf->maximum_packet        = 0;
  625.  
  626.     /* the data-chunk-size has to be 50 (DATA_HEADER_SIZE), which is
  627.      * data_size - asf->data_offset at the moment this function is done.
  628.      * It is needed to use asf as a streamable format. */
  629.     if (asf_write_header1(s, 0, DATA_HEADER_SIZE) < 0) {
  630.         //av_free(asf);
  631.         return -1;
  632.     }
  633.  
  634.     avio_flush(s->pb);
  635.  
  636.     asf->packet_nb_payloads     = 0;
  637.     asf->packet_timestamp_start = -1;
  638.     asf->packet_timestamp_end   = -1;
  639.     ffio_init_context(&asf->pb, asf->packet_buf, s->packet_size, 1,
  640.                       NULL, NULL, NULL, NULL);
  641.  
  642.     if (s->avoid_negative_ts < 0)
  643.         s->avoid_negative_ts = 1;
  644.  
  645.     return 0;
  646. }
  647.  
  648. static int asf_write_stream_header(AVFormatContext *s)
  649. {
  650.     ASFContext *asf = s->priv_data;
  651.  
  652.     asf->is_streamed = 1;
  653.  
  654.     return asf_write_header(s);
  655. }
  656.  
  657. static int put_payload_parsing_info(AVFormatContext *s,
  658.                                     unsigned sendtime, unsigned duration,
  659.                                     int nb_payloads, int padsize)
  660. {
  661.     ASFContext *asf = s->priv_data;
  662.     AVIOContext *pb = s->pb;
  663.     int ppi_size, i;
  664.     int64_t start = avio_tell(pb);
  665.  
  666.     int iLengthTypeFlags = ASF_PPI_LENGTH_TYPE_FLAGS;
  667.  
  668.     padsize -= PACKET_HEADER_MIN_SIZE;
  669.     if (asf->multi_payloads_present)
  670.         padsize--;
  671.     av_assert0(padsize >= 0);
  672.  
  673.     avio_w8(pb, ASF_PACKET_ERROR_CORRECTION_FLAGS);
  674.     for (i = 0; i < ASF_PACKET_ERROR_CORRECTION_DATA_SIZE; i++)
  675.         avio_w8(pb, 0x0);
  676.  
  677.     if (asf->multi_payloads_present)
  678.         iLengthTypeFlags |= ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT;
  679.  
  680.     if (padsize > 0) {
  681.         if (padsize < 256)
  682.             iLengthTypeFlags |= ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE;
  683.         else
  684.             iLengthTypeFlags |= ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD;
  685.     }
  686.     avio_w8(pb, iLengthTypeFlags);
  687.  
  688.     avio_w8(pb, ASF_PPI_PROPERTY_FLAGS);
  689.  
  690.     if (iLengthTypeFlags & ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD)
  691.         avio_wl16(pb, padsize - 2);
  692.     if (iLengthTypeFlags & ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE)
  693.         avio_w8(pb, padsize - 1);
  694.  
  695.     avio_wl32(pb, sendtime);
  696.     avio_wl16(pb, duration);
  697.     if (asf->multi_payloads_present)
  698.         avio_w8(pb, nb_payloads | ASF_PAYLOAD_FLAGS);
  699.  
  700.     ppi_size = avio_tell(pb) - start;
  701.  
  702.     return ppi_size;
  703. }
  704.  
  705. static void flush_packet(AVFormatContext *s)
  706. {
  707.     ASFContext *asf = s->priv_data;
  708.     int packet_hdr_size, packet_filled_size;
  709.  
  710.     av_assert0(asf->packet_timestamp_end >= asf->packet_timestamp_start);
  711.  
  712.     if (asf->is_streamed)
  713.         put_chunk(s, 0x4424, s->packet_size, 0);
  714.  
  715.     packet_hdr_size = put_payload_parsing_info(s,
  716.                                                asf->packet_timestamp_start,
  717.                                                asf->packet_timestamp_end - asf->packet_timestamp_start,
  718.                                                asf->packet_nb_payloads,
  719.                                                asf->packet_size_left);
  720.  
  721.     packet_filled_size = PACKET_SIZE - asf->packet_size_left;
  722.     av_assert0(packet_hdr_size <= asf->packet_size_left);
  723.     memset(asf->packet_buf + packet_filled_size, 0, asf->packet_size_left);
  724.  
  725.     avio_write(s->pb, asf->packet_buf, s->packet_size - packet_hdr_size);
  726.  
  727.     avio_flush(s->pb);
  728.     asf->nb_packets++;
  729.     asf->packet_nb_payloads     = 0;
  730.     asf->packet_timestamp_start = -1;
  731.     asf->packet_timestamp_end   = -1;
  732.     ffio_init_context(&asf->pb, asf->packet_buf, s->packet_size, 1,
  733.                       NULL, NULL, NULL, NULL);
  734. }
  735.  
  736. static void put_payload_header(AVFormatContext *s, ASFStream *stream,
  737.                                int64_t presentation_time, int m_obj_size,
  738.                                int m_obj_offset, int payload_len, int flags)
  739. {
  740.     ASFContext *asf = s->priv_data;
  741.     AVIOContext *pb = &asf->pb;
  742.     int val;
  743.  
  744.     val = stream->num;
  745.     if (flags & AV_PKT_FLAG_KEY)
  746.         val |= ASF_PL_FLAG_KEY_FRAME;
  747.     avio_w8(pb, val);
  748.  
  749.     avio_w8(pb, stream->seq);     // Media object number
  750.     avio_wl32(pb, m_obj_offset);  // Offset Into Media Object
  751.  
  752.     // Replicated Data shall be at least 8 bytes long.
  753.     // The first 4 bytes of data shall contain the
  754.     // Size of the Media Object that the payload belongs to.
  755.     // The next 4 bytes of data shall contain the
  756.     // Presentation Time for the media object that the payload belongs to.
  757.     avio_w8(pb, ASF_PAYLOAD_REPLICATED_DATA_LENGTH);
  758.  
  759.     avio_wl32(pb, m_obj_size);        // Replicated Data - Media Object Size
  760.     avio_wl32(pb, (uint32_t) presentation_time); // Replicated Data - Presentation Time
  761.  
  762.     if (asf->multi_payloads_present) {
  763.         avio_wl16(pb, payload_len);   // payload length
  764.     }
  765. }
  766.  
  767. static void put_frame(AVFormatContext *s, ASFStream *stream, AVStream *avst,
  768.                       int64_t timestamp, const uint8_t *buf,
  769.                       int m_obj_size, int flags)
  770. {
  771.     ASFContext *asf = s->priv_data;
  772.     int m_obj_offset, payload_len, frag_len1;
  773.  
  774.     m_obj_offset = 0;
  775.     while (m_obj_offset < m_obj_size) {
  776.         payload_len = m_obj_size - m_obj_offset;
  777.         if (asf->packet_timestamp_start == -1) {
  778.             asf->multi_payloads_present = (payload_len < MULTI_PAYLOAD_CONSTANT);
  779.  
  780.             asf->packet_size_left = PACKET_SIZE;
  781.             if (asf->multi_payloads_present) {
  782.                 frag_len1 = MULTI_PAYLOAD_CONSTANT - 1;
  783.             } else {
  784.                 frag_len1 = SINGLE_PAYLOAD_DATA_LENGTH;
  785.             }
  786.             asf->packet_timestamp_start = timestamp;
  787.         } else {
  788.             // multi payloads
  789.             frag_len1 = asf->packet_size_left -
  790.                         PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS -
  791.                         PACKET_HEADER_MIN_SIZE - 1;
  792.  
  793.             if (frag_len1 < payload_len &&
  794.                 avst->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
  795.                 flush_packet(s);
  796.                 continue;
  797.             }
  798.         }
  799.         if (frag_len1 > 0) {
  800.             if (payload_len > frag_len1)
  801.                 payload_len = frag_len1;
  802.             else if (payload_len == (frag_len1 - 1))
  803.                 payload_len = frag_len1 - 2;  // additional byte need to put padding length
  804.  
  805.             put_payload_header(s, stream, timestamp + PREROLL_TIME,
  806.                                m_obj_size, m_obj_offset, payload_len, flags);
  807.             avio_write(&asf->pb, buf, payload_len);
  808.  
  809.             if (asf->multi_payloads_present)
  810.                 asf->packet_size_left -= (payload_len + PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS);
  811.             else
  812.                 asf->packet_size_left -= (payload_len + PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD);
  813.             asf->packet_timestamp_end = timestamp;
  814.  
  815.             asf->packet_nb_payloads++;
  816.         } else {
  817.             payload_len = 0;
  818.         }
  819.         m_obj_offset += payload_len;
  820.         buf          += payload_len;
  821.  
  822.         if (!asf->multi_payloads_present)
  823.             flush_packet(s);
  824.         else if (asf->packet_size_left <= (PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS + PACKET_HEADER_MIN_SIZE + 1))
  825.             flush_packet(s);
  826.     }
  827.     stream->seq++;
  828. }
  829.  
  830. static int update_index(AVFormatContext *s, int start_sec,
  831.                          uint32_t packet_number, uint16_t packet_count,
  832.                          uint64_t packet_offset)
  833. {
  834.     ASFContext *asf = s->priv_data;
  835.  
  836.     if (start_sec > asf->next_start_sec) {
  837.         int i;
  838.  
  839.         if (!asf->next_start_sec) {
  840.             asf->next_packet_number = packet_number;
  841.             asf->next_packet_count  = packet_count;
  842.             asf->next_packet_offset = packet_offset;
  843.         }
  844.  
  845.         if (start_sec > asf->nb_index_memory_alloc) {
  846.             int err;
  847.             asf->nb_index_memory_alloc = (start_sec + ASF_INDEX_BLOCK) & ~(ASF_INDEX_BLOCK - 1);
  848.             if ((err = av_reallocp_array(&asf->index_ptr,
  849.                                          asf->nb_index_memory_alloc,
  850.                                          sizeof(*asf->index_ptr))) < 0) {
  851.                 asf->nb_index_memory_alloc = 0;
  852.                 return err;
  853.             }
  854.         }
  855.         for (i = asf->next_start_sec; i < start_sec; i++) {
  856.             asf->index_ptr[i].packet_number = asf->next_packet_number;
  857.             asf->index_ptr[i].packet_count  = asf->next_packet_count;
  858.             asf->index_ptr[i].send_time     = asf->next_start_sec * INT64_C(10000000);
  859.             asf->index_ptr[i].offset        = asf->next_packet_offset;
  860.  
  861.         }
  862.     }
  863.     asf->maximum_packet     = FFMAX(asf->maximum_packet, packet_count);
  864.     asf->next_packet_number = packet_number;
  865.     asf->next_packet_count  = packet_count;
  866.     asf->next_packet_offset = packet_offset;
  867.     asf->next_start_sec     = start_sec;
  868.  
  869.     return 0;
  870. }
  871.  
  872. static int asf_write_packet(AVFormatContext *s, AVPacket *pkt)
  873. {
  874.     ASFContext *asf = s->priv_data;
  875.     AVIOContext *pb = s->pb;
  876.     ASFStream *stream;
  877.     AVCodecContext *codec;
  878.     uint32_t packet_number;
  879.     int64_t pts;
  880.     int start_sec;
  881.     int flags = pkt->flags;
  882.     int ret;
  883.     uint64_t offset = avio_tell(pb);
  884.  
  885.     codec  = s->streams[pkt->stream_index]->codec;
  886.     stream = &asf->streams[pkt->stream_index];
  887.  
  888.     if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
  889.         flags &= ~AV_PKT_FLAG_KEY;
  890.  
  891.     pts = (pkt->pts != AV_NOPTS_VALUE) ? pkt->pts : pkt->dts;
  892.     av_assert0(pts != AV_NOPTS_VALUE);
  893.     pts *= 10000;
  894.     asf->duration = FFMAX(asf->duration, pts + pkt->duration * 10000);
  895.  
  896.     packet_number = asf->nb_packets;
  897.     put_frame(s, stream, s->streams[pkt->stream_index],
  898.               pkt->dts, pkt->data, pkt->size, flags);
  899.  
  900.     start_sec = (int)((PREROLL_TIME * 10000 + pts + ASF_INDEXED_INTERVAL - 1)
  901.               / ASF_INDEXED_INTERVAL);
  902.  
  903.     /* check index */
  904.     if ((!asf->is_streamed) && (flags & AV_PKT_FLAG_KEY)) {
  905.         uint16_t packet_count = asf->nb_packets - packet_number;
  906.         ret = update_index(s, start_sec, packet_number, packet_count, offset);
  907.         if (ret < 0)
  908.             return ret;
  909.     }
  910.     asf->end_sec = start_sec;
  911.  
  912.     return 0;
  913. }
  914.  
  915. static int asf_write_index(AVFormatContext *s, ASFIndex *index,
  916.                            uint16_t max, uint32_t count)
  917. {
  918.     AVIOContext *pb = s->pb;
  919.     int i;
  920.  
  921.     ff_put_guid(pb, &ff_asf_simple_index_header);
  922.     avio_wl64(pb, 24 + 16 + 8 + 4 + 4 + (4 + 2) * count);
  923.     ff_put_guid(pb, &ff_asf_my_guid);
  924.     avio_wl64(pb, ASF_INDEXED_INTERVAL);
  925.     avio_wl32(pb, max);
  926.     avio_wl32(pb, count);
  927.     for (i = 0; i < count; i++) {
  928.         avio_wl32(pb, index[i].packet_number);
  929.         avio_wl16(pb, index[i].packet_count);
  930.     }
  931.  
  932.     return 0;
  933. }
  934.  
  935. static int asf_write_trailer(AVFormatContext *s)
  936. {
  937.     ASFContext *asf = s->priv_data;
  938.     int64_t file_size, data_size;
  939.     int ret;
  940.  
  941.     /* flush the current packet */
  942.     if (asf->pb.buf_ptr > asf->pb.buffer)
  943.         flush_packet(s);
  944.  
  945.     /* write index */
  946.     data_size = avio_tell(s->pb);
  947.     if (!asf->is_streamed && asf->next_start_sec) {
  948.         if ((ret = update_index(s, asf->end_sec + 1, 0, 0, 0)) < 0)
  949.             return ret;
  950.         asf_write_index(s, asf->index_ptr, asf->maximum_packet, asf->next_start_sec);
  951.     }
  952.     avio_flush(s->pb);
  953.  
  954.     if (asf->is_streamed || !s->pb->seekable) {
  955.         put_chunk(s, 0x4524, 0, 0); /* end of stream */
  956.     } else {
  957.         /* rewrite an updated header */
  958.         file_size = avio_tell(s->pb);
  959.         avio_seek(s->pb, 0, SEEK_SET);
  960.         asf_write_header1(s, file_size, data_size - asf->data_offset);
  961.     }
  962.  
  963.     av_freep(&asf->index_ptr);
  964.     return 0;
  965. }
  966.  
  967. #if CONFIG_ASF_MUXER
  968. AVOutputFormat ff_asf_muxer = {
  969.     .name           = "asf",
  970.     .long_name      = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
  971.     .mime_type      = "video/x-ms-asf",
  972.     .extensions     = "asf,wmv,wma",
  973.     .priv_data_size = sizeof(ASFContext),
  974.     .audio_codec    = AV_CODEC_ID_WMAV2,
  975.     .video_codec    = AV_CODEC_ID_MSMPEG4V3,
  976.     .write_header   = asf_write_header,
  977.     .write_packet   = asf_write_packet,
  978.     .write_trailer  = asf_write_trailer,
  979.     .flags          = AVFMT_GLOBALHEADER,
  980.     .codec_tag      = (const AVCodecTag * const []) {
  981.         codec_asf_bmp_tags, ff_codec_bmp_tags, ff_codec_wav_tags, 0
  982.     },
  983. };
  984. #endif /* CONFIG_ASF_MUXER */
  985.  
  986. #if CONFIG_ASF_STREAM_MUXER
  987. AVOutputFormat ff_asf_stream_muxer = {
  988.     .name           = "asf_stream",
  989.     .long_name      = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
  990.     .mime_type      = "video/x-ms-asf",
  991.     .extensions     = "asf,wmv,wma",
  992.     .priv_data_size = sizeof(ASFContext),
  993.     .audio_codec    = AV_CODEC_ID_WMAV2,
  994.     .video_codec    = AV_CODEC_ID_MSMPEG4V3,
  995.     .write_header   = asf_write_stream_header,
  996.     .write_packet   = asf_write_packet,
  997.     .write_trailer  = asf_write_trailer,
  998.     .flags          = AVFMT_GLOBALHEADER,
  999.     .codec_tag      = (const AVCodecTag * const []) {
  1000.         codec_asf_bmp_tags, ff_codec_bmp_tags, ff_codec_wav_tags, 0
  1001.     },
  1002. };
  1003. #endif /* CONFIG_ASF_STREAM_MUXER */
  1004.