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libavformat/asfenc.c

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00001 /*
00002  * ASF muxer
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 #include "avformat.h"
00022 #include "riff.h"
00023 #include "asf.h"
00024 #include "avio_internal.h"
00025 #include "libavutil/dict.h"
00026 
00027 #undef NDEBUG
00028 #include <assert.h>
00029 
00030 
00031 #define ASF_INDEXED_INTERVAL    10000000
00032 #define ASF_INDEX_BLOCK         600
00033 
00034 #define ASF_PACKET_ERROR_CORRECTION_DATA_SIZE 0x2
00035 #define ASF_PACKET_ERROR_CORRECTION_FLAGS (\
00036                 ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT | \
00037                 ASF_PACKET_ERROR_CORRECTION_DATA_SIZE\
00038                 )
00039 
00040 #if (ASF_PACKET_ERROR_CORRECTION_FLAGS != 0)
00041 #   define ASF_PACKET_ERROR_CORRECTION_FLAGS_FIELD_SIZE 1
00042 #else
00043 #   define ASF_PACKET_ERROR_CORRECTION_FLAGS_FIELD_SIZE 0
00044 #endif
00045 
00046 #define ASF_PPI_PROPERTY_FLAGS (\
00047                 ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_BYTE | \
00048                 ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_DWORD | \
00049                 ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_BYTE | \
00050                 ASF_PL_FLAG_STREAM_NUMBER_LENGTH_FIELD_IS_BYTE \
00051                 )
00052 
00053 #define ASF_PPI_LENGTH_TYPE_FLAGS 0
00054 
00055 #define ASF_PAYLOAD_FLAGS ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_WORD
00056 
00057 #if (ASF_PPI_FLAG_SEQUENCE_FIELD_IS_BYTE == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE))
00058 #   define ASF_PPI_SEQUENCE_FIELD_SIZE 1
00059 #endif
00060 #if (ASF_PPI_FLAG_SEQUENCE_FIELD_IS_WORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE))
00061 #   define ASF_PPI_SEQUENCE_FIELD_SIZE 2
00062 #endif
00063 #if (ASF_PPI_FLAG_SEQUENCE_FIELD_IS_DWORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE))
00064 #   define ASF_PPI_SEQUENCE_FIELD_SIZE 4
00065 #endif
00066 #ifndef ASF_PPI_SEQUENCE_FIELD_SIZE
00067 #   define ASF_PPI_SEQUENCE_FIELD_SIZE 0
00068 #endif
00069 
00070 
00071 #if (ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_BYTE == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE))
00072 #   define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 1
00073 #endif
00074 #if (ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_WORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE))
00075 #   define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 2
00076 #endif
00077 #if (ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_DWORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE))
00078 #   define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 4
00079 #endif
00080 #ifndef ASF_PPI_PACKET_LENGTH_FIELD_SIZE
00081 #   define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 0
00082 #endif
00083 
00084 #if (ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE))
00085 #   define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 1
00086 #endif
00087 #if (ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE))
00088 #   define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 2
00089 #endif
00090 #if (ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_DWORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE))
00091 #   define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 4
00092 #endif
00093 #ifndef ASF_PPI_PADDING_LENGTH_FIELD_SIZE
00094 #   define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 0
00095 #endif
00096 
00097 #if (ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_BYTE == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE))
00098 #   define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 1
00099 #endif
00100 #if (ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_WORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE))
00101 #   define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 2
00102 #endif
00103 #if (ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_DWORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE))
00104 #   define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 4
00105 #endif
00106 #ifndef ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE
00107 #   define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 0
00108 #endif
00109 
00110 #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))
00111 #   define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 1
00112 #endif
00113 #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))
00114 #   define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 2
00115 #endif
00116 #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))
00117 #   define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 4
00118 #endif
00119 #ifndef ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE
00120 #   define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 0
00121 #endif
00122 
00123 #if (ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_BYTE == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE))
00124 #   define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 1
00125 #endif
00126 #if (ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_WORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE))
00127 #   define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 2
00128 #endif
00129 #if (ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_DWORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE))
00130 #   define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 4
00131 #endif
00132 #ifndef ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE
00133 #   define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 0
00134 #endif
00135 
00136 #if (ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_BYTE == (ASF_PAYLOAD_FLAGS & ASF_PL_MASK_PAYLOAD_LENGTH_FIELD_SIZE))
00137 #   define ASF_PAYLOAD_LENGTH_FIELD_SIZE 1
00138 #endif
00139 #if (ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_WORD == (ASF_PAYLOAD_FLAGS & ASF_PL_MASK_PAYLOAD_LENGTH_FIELD_SIZE))
00140 #   define ASF_PAYLOAD_LENGTH_FIELD_SIZE 2
00141 #endif
00142 #ifndef ASF_PAYLOAD_LENGTH_FIELD_SIZE
00143 #   define ASF_PAYLOAD_LENGTH_FIELD_SIZE 0
00144 #endif
00145 
00146 #define PACKET_HEADER_MIN_SIZE (\
00147                 ASF_PACKET_ERROR_CORRECTION_FLAGS_FIELD_SIZE + \
00148                 ASF_PACKET_ERROR_CORRECTION_DATA_SIZE + \
00149                 1 + /*Length Type Flags*/ \
00150                 1 + /*Property Flags*/ \
00151                 ASF_PPI_PACKET_LENGTH_FIELD_SIZE + \
00152                 ASF_PPI_SEQUENCE_FIELD_SIZE + \
00153                 ASF_PPI_PADDING_LENGTH_FIELD_SIZE + \
00154                 4 + /*Send Time Field*/ \
00155                 2   /*Duration Field*/ \
00156                 )
00157 
00158 
00159 // Replicated Data shall be at least 8 bytes long.
00160 #define ASF_PAYLOAD_REPLICATED_DATA_LENGTH 0x08
00161 
00162 #define PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD (\
00163                 1 + /*Stream Number*/ \
00164                 ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE + \
00165                 ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE + \
00166                 ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE + \
00167                 ASF_PAYLOAD_REPLICATED_DATA_LENGTH \
00168                 )
00169 
00170 #define PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS (\
00171                 1 + /*Stream Number*/ \
00172                 ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE + \
00173                 ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE + \
00174                 ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE + \
00175                 ASF_PAYLOAD_REPLICATED_DATA_LENGTH + \
00176                 ASF_PAYLOAD_LENGTH_FIELD_SIZE \
00177                 )
00178 
00179 #define SINGLE_PAYLOAD_DATA_LENGTH (\
00180                 PACKET_SIZE - \
00181                 PACKET_HEADER_MIN_SIZE - \
00182                 PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD \
00183                 )
00184 
00185 #define MULTI_PAYLOAD_CONSTANT (\
00186                 PACKET_SIZE - \
00187                 PACKET_HEADER_MIN_SIZE - \
00188                 1 - /*Payload Flags*/ \
00189                 2*PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS \
00190                 )
00191 
00192 typedef struct {
00193     uint32_t seqno;
00194     int is_streamed;
00195     ASFStream streams[128];              
00196     /* non streamed additonnal info */
00197     uint64_t nb_packets;                 
00198     int64_t duration;                    
00199     /* packet filling */
00200     unsigned char multi_payloads_present;
00201     int packet_size_left;
00202     int packet_timestamp_start;
00203     int packet_timestamp_end;
00204     unsigned int packet_nb_payloads;
00205     uint8_t packet_buf[PACKET_SIZE];
00206     AVIOContext pb;
00207     /* only for reading */
00208     uint64_t data_offset;                
00209 
00210     int64_t last_indexed_pts;
00211     ASFIndex* index_ptr;
00212     uint32_t nb_index_count;
00213     uint32_t nb_index_memory_alloc;
00214     uint16_t maximum_packet;
00215 } ASFContext;
00216 
00217 static const AVCodecTag codec_asf_bmp_tags[] = {
00218     { CODEC_ID_MPEG4, MKTAG('M', 'P', '4', 'S') },
00219     { CODEC_ID_MPEG4, MKTAG('M', '4', 'S', '2') },
00220     { CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') },
00221     { CODEC_ID_NONE, 0 },
00222 };
00223 
00224 #define PREROLL_TIME 3100
00225 
00226 static void put_guid(AVIOContext *s, const ff_asf_guid *g)
00227 {
00228     assert(sizeof(*g) == 16);
00229     avio_write(s, *g, sizeof(*g));
00230 }
00231 
00232 static void put_str16(AVIOContext *s, const char *tag)
00233 {
00234     int len;
00235     uint8_t *pb;
00236     AVIOContext *dyn_buf;
00237     if (avio_open_dyn_buf(&dyn_buf) < 0)
00238         return;
00239 
00240     avio_put_str16le(dyn_buf, tag);
00241     len = avio_close_dyn_buf(dyn_buf, &pb);
00242     avio_wl16(s, len);
00243     avio_write(s, pb, len);
00244     av_freep(&pb);
00245 }
00246 
00247 static int64_t put_header(AVIOContext *pb, const ff_asf_guid *g)
00248 {
00249     int64_t pos;
00250 
00251     pos = avio_tell(pb);
00252     put_guid(pb, g);
00253     avio_wl64(pb, 24);
00254     return pos;
00255 }
00256 
00257 /* update header size */
00258 static void end_header(AVIOContext *pb, int64_t pos)
00259 {
00260     int64_t pos1;
00261 
00262     pos1 = avio_tell(pb);
00263     avio_seek(pb, pos + 16, SEEK_SET);
00264     avio_wl64(pb, pos1 - pos);
00265     avio_seek(pb, pos1, SEEK_SET);
00266 }
00267 
00268 /* write an asf chunk (only used in streaming case) */
00269 static void put_chunk(AVFormatContext *s, int type, int payload_length, int flags)
00270 {
00271     ASFContext *asf = s->priv_data;
00272     AVIOContext *pb = s->pb;
00273     int length;
00274 
00275     length = payload_length + 8;
00276     avio_wl16(pb, type);
00277     avio_wl16(pb, length);    //size
00278     avio_wl32(pb, asf->seqno);//sequence number
00279     avio_wl16(pb, flags); /* unknown bytes */
00280     avio_wl16(pb, length);    //size_confirm
00281     asf->seqno++;
00282 }
00283 
00284 /* convert from unix to windows time */
00285 static int64_t unix_to_file_time(int ti)
00286 {
00287     int64_t t;
00288 
00289     t = ti * INT64_C(10000000);
00290     t += INT64_C(116444736000000000);
00291     return t;
00292 }
00293 
00294 /* write the header (used two times if non streamed) */
00295 static int asf_write_header1(AVFormatContext *s, int64_t file_size, int64_t data_chunk_size)
00296 {
00297     ASFContext *asf = s->priv_data;
00298     AVIOContext *pb = s->pb;
00299     AVDictionaryEntry *tags[5];
00300     int header_size, n, extra_size, extra_size2, wav_extra_size, file_time;
00301     int has_title;
00302     int metadata_count;
00303     AVCodecContext *enc;
00304     int64_t header_offset, cur_pos, hpos;
00305     int bit_rate;
00306     int64_t duration;
00307 
00308     ff_metadata_conv(&s->metadata, ff_asf_metadata_conv, NULL);
00309 
00310     tags[0] = av_dict_get(s->metadata, "title"    , NULL, 0);
00311     tags[1] = av_dict_get(s->metadata, "author"   , NULL, 0);
00312     tags[2] = av_dict_get(s->metadata, "copyright", NULL, 0);
00313     tags[3] = av_dict_get(s->metadata, "comment"  , NULL, 0);
00314     tags[4] = av_dict_get(s->metadata, "rating"   , NULL, 0);
00315 
00316     duration = asf->duration + PREROLL_TIME * 10000;
00317     has_title = tags[0] || tags[1] || tags[2] || tags[3] || tags[4];
00318     metadata_count = s->metadata ? s->metadata->count : 0;
00319 
00320     bit_rate = 0;
00321     for(n=0;n<s->nb_streams;n++) {
00322         enc = s->streams[n]->codec;
00323 
00324         av_set_pts_info(s->streams[n], 32, 1, 1000); /* 32 bit pts in ms */
00325 
00326         bit_rate += enc->bit_rate;
00327     }
00328 
00329     if (asf->is_streamed) {
00330         put_chunk(s, 0x4824, 0, 0xc00); /* start of stream (length will be patched later) */
00331     }
00332 
00333     put_guid(pb, &ff_asf_header);
00334     avio_wl64(pb, -1); /* header length, will be patched after */
00335     avio_wl32(pb, 3 + has_title + !!metadata_count + s->nb_streams); /* number of chunks in header */
00336     avio_w8(pb, 1); /* ??? */
00337     avio_w8(pb, 2); /* ??? */
00338 
00339     /* file header */
00340     header_offset = avio_tell(pb);
00341     hpos = put_header(pb, &ff_asf_file_header);
00342     put_guid(pb, &ff_asf_my_guid);
00343     avio_wl64(pb, file_size);
00344     file_time = 0;
00345     avio_wl64(pb, unix_to_file_time(file_time));
00346     avio_wl64(pb, asf->nb_packets); /* number of packets */
00347     avio_wl64(pb, duration); /* end time stamp (in 100ns units) */
00348     avio_wl64(pb, asf->duration); /* duration (in 100ns units) */
00349     avio_wl64(pb, PREROLL_TIME); /* start time stamp */
00350     avio_wl32(pb, (asf->is_streamed || !pb->seekable ) ? 3 : 2); /* ??? */
00351     avio_wl32(pb, s->packet_size); /* packet size */
00352     avio_wl32(pb, s->packet_size); /* packet size */
00353     avio_wl32(pb, bit_rate); /* Nominal data rate in bps */
00354     end_header(pb, hpos);
00355 
00356     /* unknown headers */
00357     hpos = put_header(pb, &ff_asf_head1_guid);
00358     put_guid(pb, &ff_asf_head2_guid);
00359     avio_wl32(pb, 6);
00360     avio_wl16(pb, 0);
00361     end_header(pb, hpos);
00362 
00363     /* title and other infos */
00364     if (has_title) {
00365         int len;
00366         uint8_t *buf;
00367         AVIOContext *dyn_buf;
00368 
00369         if (avio_open_dyn_buf(&dyn_buf) < 0)
00370             return AVERROR(ENOMEM);
00371 
00372         hpos = put_header(pb, &ff_asf_comment_header);
00373 
00374         for (n = 0; n < FF_ARRAY_ELEMS(tags); n++) {
00375             len = tags[n] ? avio_put_str16le(dyn_buf, tags[n]->value) : 0;
00376             avio_wl16(pb, len);
00377         }
00378         len = avio_close_dyn_buf(dyn_buf, &buf);
00379         avio_write(pb, buf, len);
00380         av_freep(&buf);
00381         end_header(pb, hpos);
00382     }
00383     if (metadata_count) {
00384         AVDictionaryEntry *tag = NULL;
00385         hpos = put_header(pb, &ff_asf_extended_content_header);
00386         avio_wl16(pb, metadata_count);
00387         while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
00388             put_str16(pb, tag->key);
00389             avio_wl16(pb, 0);
00390             put_str16(pb, tag->value);
00391         }
00392         end_header(pb, hpos);
00393     }
00394 
00395     /* stream headers */
00396     for(n=0;n<s->nb_streams;n++) {
00397         int64_t es_pos;
00398         //        ASFStream *stream = &asf->streams[n];
00399 
00400         enc = s->streams[n]->codec;
00401         asf->streams[n].num = n + 1;
00402         asf->streams[n].seq = 0;
00403 
00404 
00405         switch(enc->codec_type) {
00406         case AVMEDIA_TYPE_AUDIO:
00407             wav_extra_size = 0;
00408             extra_size = 18 + wav_extra_size;
00409             extra_size2 = 8;
00410             break;
00411         default:
00412         case AVMEDIA_TYPE_VIDEO:
00413             wav_extra_size = enc->extradata_size;
00414             extra_size = 0x33 + wav_extra_size;
00415             extra_size2 = 0;
00416             break;
00417         }
00418 
00419         hpos = put_header(pb, &ff_asf_stream_header);
00420         if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
00421             put_guid(pb, &ff_asf_audio_stream);
00422             put_guid(pb, &ff_asf_audio_conceal_spread);
00423         } else {
00424             put_guid(pb, &ff_asf_video_stream);
00425             put_guid(pb, &ff_asf_video_conceal_none);
00426         }
00427         avio_wl64(pb, 0); /* ??? */
00428         es_pos = avio_tell(pb);
00429         avio_wl32(pb, extra_size); /* wav header len */
00430         avio_wl32(pb, extra_size2); /* additional data len */
00431         avio_wl16(pb, n + 1); /* stream number */
00432         avio_wl32(pb, 0); /* ??? */
00433 
00434         if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
00435             /* WAVEFORMATEX header */
00436             int wavsize = ff_put_wav_header(pb, enc);
00437             if ((enc->codec_id != CODEC_ID_MP3) && (enc->codec_id != CODEC_ID_MP2) && (enc->codec_id != CODEC_ID_ADPCM_IMA_WAV) && (enc->extradata_size==0)) {
00438                 wavsize += 2;
00439                 avio_wl16(pb, 0);
00440             }
00441 
00442             if (wavsize < 0)
00443                 return -1;
00444             if (wavsize != extra_size) {
00445                 cur_pos = avio_tell(pb);
00446                 avio_seek(pb, es_pos, SEEK_SET);
00447                 avio_wl32(pb, wavsize); /* wav header len */
00448                 avio_seek(pb, cur_pos, SEEK_SET);
00449             }
00450             /* ERROR Correction */
00451             avio_w8(pb, 0x01);
00452             if(enc->codec_id == CODEC_ID_ADPCM_G726 || !enc->block_align){
00453                 avio_wl16(pb, 0x0190);
00454                 avio_wl16(pb, 0x0190);
00455             }else{
00456                 avio_wl16(pb, enc->block_align);
00457                 avio_wl16(pb, enc->block_align);
00458             }
00459             avio_wl16(pb, 0x01);
00460             avio_w8(pb, 0x00);
00461         } else {
00462             avio_wl32(pb, enc->width);
00463             avio_wl32(pb, enc->height);
00464             avio_w8(pb, 2); /* ??? */
00465             avio_wl16(pb, 40 + enc->extradata_size); /* size */
00466 
00467             /* BITMAPINFOHEADER header */
00468             ff_put_bmp_header(pb, enc, ff_codec_bmp_tags, 1);
00469         }
00470         end_header(pb, hpos);
00471     }
00472 
00473     /* media comments */
00474 
00475     hpos = put_header(pb, &ff_asf_codec_comment_header);
00476     put_guid(pb, &ff_asf_codec_comment1_header);
00477     avio_wl32(pb, s->nb_streams);
00478     for(n=0;n<s->nb_streams;n++) {
00479         AVCodec *p;
00480         const char *desc;
00481         int len;
00482         uint8_t *buf;
00483         AVIOContext *dyn_buf;
00484 
00485         enc = s->streams[n]->codec;
00486         p = avcodec_find_encoder(enc->codec_id);
00487 
00488         if(enc->codec_type == AVMEDIA_TYPE_AUDIO)
00489             avio_wl16(pb, 2);
00490         else if(enc->codec_type == AVMEDIA_TYPE_VIDEO)
00491             avio_wl16(pb, 1);
00492         else
00493             avio_wl16(pb, -1);
00494 
00495         if(enc->codec_id == CODEC_ID_WMAV2)
00496             desc = "Windows Media Audio V8";
00497         else
00498             desc = p ? p->name : enc->codec_name;
00499 
00500         if ( avio_open_dyn_buf(&dyn_buf) < 0)
00501             return AVERROR(ENOMEM);
00502 
00503         avio_put_str16le(dyn_buf, desc);
00504         len = avio_close_dyn_buf(dyn_buf, &buf);
00505         avio_wl16(pb, len / 2); // "number of characters" = length in bytes / 2
00506 
00507         avio_write(pb, buf, len);
00508         av_freep(&buf);
00509 
00510         avio_wl16(pb, 0); /* no parameters */
00511 
00512 
00513         /* id */
00514         if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
00515             avio_wl16(pb, 2);
00516             avio_wl16(pb, enc->codec_tag);
00517         } else {
00518             avio_wl16(pb, 4);
00519             avio_wl32(pb, enc->codec_tag);
00520         }
00521         if(!enc->codec_tag)
00522             return -1;
00523     }
00524     end_header(pb, hpos);
00525 
00526     /* patch the header size fields */
00527 
00528     cur_pos = avio_tell(pb);
00529     header_size = cur_pos - header_offset;
00530     if (asf->is_streamed) {
00531         header_size += 8 + 30 + 50;
00532 
00533         avio_seek(pb, header_offset - 10 - 30, SEEK_SET);
00534         avio_wl16(pb, header_size);
00535         avio_seek(pb, header_offset - 2 - 30, SEEK_SET);
00536         avio_wl16(pb, header_size);
00537 
00538         header_size -= 8 + 30 + 50;
00539     }
00540     header_size += 24 + 6;
00541     avio_seek(pb, header_offset - 14, SEEK_SET);
00542     avio_wl64(pb, header_size);
00543     avio_seek(pb, cur_pos, SEEK_SET);
00544 
00545     /* movie chunk, followed by packets of packet_size */
00546     asf->data_offset = cur_pos;
00547     put_guid(pb, &ff_asf_data_header);
00548     avio_wl64(pb, data_chunk_size);
00549     put_guid(pb, &ff_asf_my_guid);
00550     avio_wl64(pb, asf->nb_packets); /* nb packets */
00551     avio_w8(pb, 1); /* ??? */
00552     avio_w8(pb, 1); /* ??? */
00553     return 0;
00554 }
00555 
00556 static int asf_write_header(AVFormatContext *s)
00557 {
00558     ASFContext *asf = s->priv_data;
00559 
00560     s->packet_size  = PACKET_SIZE;
00561     asf->nb_packets = 0;
00562 
00563     asf->last_indexed_pts = 0;
00564     asf->index_ptr = av_malloc( sizeof(ASFIndex) * ASF_INDEX_BLOCK );
00565     asf->nb_index_memory_alloc = ASF_INDEX_BLOCK;
00566     asf->nb_index_count = 0;
00567     asf->maximum_packet = 0;
00568 
00569     /* the data-chunk-size has to be 50, which is data_size - asf->data_offset
00570      *  at the moment this function is done. It is needed to use asf as
00571      *  streamable format. */
00572     if (asf_write_header1(s, 0, 50) < 0) {
00573         //av_free(asf);
00574         return -1;
00575     }
00576 
00577     avio_flush(s->pb);
00578 
00579     asf->packet_nb_payloads = 0;
00580     asf->packet_timestamp_start = -1;
00581     asf->packet_timestamp_end = -1;
00582     ffio_init_context(&asf->pb, asf->packet_buf, s->packet_size, 1,
00583                   NULL, NULL, NULL, NULL);
00584 
00585     return 0;
00586 }
00587 
00588 static int asf_write_stream_header(AVFormatContext *s)
00589 {
00590     ASFContext *asf = s->priv_data;
00591 
00592     asf->is_streamed = 1;
00593 
00594     return asf_write_header(s);
00595 }
00596 
00597 static int put_payload_parsing_info(
00598                                 AVFormatContext *s,
00599                                 unsigned int    sendtime,
00600                                 unsigned int    duration,
00601                                 int             nb_payloads,
00602                                 int             padsize
00603             )
00604 {
00605     ASFContext *asf = s->priv_data;
00606     AVIOContext *pb = s->pb;
00607     int ppi_size, i;
00608     int64_t start= avio_tell(pb);
00609 
00610     int iLengthTypeFlags = ASF_PPI_LENGTH_TYPE_FLAGS;
00611 
00612     padsize -= PACKET_HEADER_MIN_SIZE;
00613     if(asf->multi_payloads_present)
00614         padsize--;
00615     assert(padsize>=0);
00616 
00617     avio_w8(pb, ASF_PACKET_ERROR_CORRECTION_FLAGS);
00618     for (i = 0; i < ASF_PACKET_ERROR_CORRECTION_DATA_SIZE; i++){
00619         avio_w8(pb, 0x0);
00620     }
00621 
00622     if (asf->multi_payloads_present)
00623         iLengthTypeFlags |= ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT;
00624 
00625     if (padsize > 0) {
00626         if (padsize < 256)
00627             iLengthTypeFlags |= ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE;
00628         else
00629             iLengthTypeFlags |= ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD;
00630     }
00631     avio_w8(pb, iLengthTypeFlags);
00632 
00633     avio_w8(pb, ASF_PPI_PROPERTY_FLAGS);
00634 
00635     if (iLengthTypeFlags & ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD)
00636         avio_wl16(pb, padsize - 2);
00637     if (iLengthTypeFlags & ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE)
00638         avio_w8(pb, padsize - 1);
00639 
00640     avio_wl32(pb, sendtime);
00641     avio_wl16(pb, duration);
00642     if (asf->multi_payloads_present)
00643         avio_w8(pb, nb_payloads | ASF_PAYLOAD_FLAGS);
00644 
00645     ppi_size = avio_tell(pb) - start;
00646 
00647     return ppi_size;
00648 }
00649 
00650 static void flush_packet(AVFormatContext *s)
00651 {
00652     ASFContext *asf = s->priv_data;
00653     int packet_hdr_size, packet_filled_size;
00654 
00655     assert(asf->packet_timestamp_end >= asf->packet_timestamp_start);
00656 
00657     if (asf->is_streamed) {
00658         put_chunk(s, 0x4424, s->packet_size, 0);
00659     }
00660 
00661     packet_hdr_size = put_payload_parsing_info(
00662                             s,
00663                             asf->packet_timestamp_start,
00664                             asf->packet_timestamp_end - asf->packet_timestamp_start,
00665                             asf->packet_nb_payloads,
00666                             asf->packet_size_left
00667                         );
00668 
00669     packet_filled_size = PACKET_SIZE - asf->packet_size_left;
00670     assert(packet_hdr_size <= asf->packet_size_left);
00671     memset(asf->packet_buf + packet_filled_size, 0, asf->packet_size_left);
00672 
00673     avio_write(s->pb, asf->packet_buf, s->packet_size - packet_hdr_size);
00674 
00675     avio_flush(s->pb);
00676     asf->nb_packets++;
00677     asf->packet_nb_payloads = 0;
00678     asf->packet_timestamp_start = -1;
00679     asf->packet_timestamp_end = -1;
00680     ffio_init_context(&asf->pb, asf->packet_buf, s->packet_size, 1,
00681                   NULL, NULL, NULL, NULL);
00682 }
00683 
00684 static void put_payload_header(
00685                                 AVFormatContext *s,
00686                                 ASFStream       *stream,
00687                                 int             presentation_time,
00688                                 int             m_obj_size,
00689                                 int             m_obj_offset,
00690                                 int             payload_len,
00691                                 int             flags
00692             )
00693 {
00694     ASFContext *asf = s->priv_data;
00695     AVIOContext *pb = &asf->pb;
00696     int val;
00697 
00698     val = stream->num;
00699     if (flags & AV_PKT_FLAG_KEY)
00700         val |= ASF_PL_FLAG_KEY_FRAME;
00701     avio_w8(pb, val);
00702 
00703     avio_w8(pb, stream->seq);  //Media object number
00704     avio_wl32(pb, m_obj_offset); //Offset Into Media Object
00705 
00706     // Replicated Data shall be at least 8 bytes long.
00707     // The first 4 bytes of data shall contain the
00708     // Size of the Media Object that the payload belongs to.
00709     // The next 4 bytes of data shall contain the
00710     // Presentation Time for the media object that the payload belongs to.
00711     avio_w8(pb, ASF_PAYLOAD_REPLICATED_DATA_LENGTH);
00712 
00713     avio_wl32(pb, m_obj_size);       //Replicated Data - Media Object Size
00714     avio_wl32(pb, presentation_time);//Replicated Data - Presentation Time
00715 
00716     if (asf->multi_payloads_present){
00717         avio_wl16(pb, payload_len);   //payload length
00718     }
00719 }
00720 
00721 static void put_frame(
00722                     AVFormatContext *s,
00723                     ASFStream       *stream,
00724                     AVStream        *avst,
00725                     int             timestamp,
00726                     const uint8_t   *buf,
00727                     int             m_obj_size,
00728                     int             flags
00729                 )
00730 {
00731     ASFContext *asf = s->priv_data;
00732     int m_obj_offset, payload_len, frag_len1;
00733 
00734     m_obj_offset = 0;
00735     while (m_obj_offset < m_obj_size) {
00736         payload_len = m_obj_size - m_obj_offset;
00737         if (asf->packet_timestamp_start == -1) {
00738             asf->multi_payloads_present = (payload_len < MULTI_PAYLOAD_CONSTANT);
00739 
00740             asf->packet_size_left = PACKET_SIZE;
00741             if (asf->multi_payloads_present){
00742                 frag_len1 = MULTI_PAYLOAD_CONSTANT - 1;
00743             }
00744             else {
00745                 frag_len1 = SINGLE_PAYLOAD_DATA_LENGTH;
00746             }
00747             asf->packet_timestamp_start = timestamp;
00748         }
00749         else {
00750             // multi payloads
00751             frag_len1 = asf->packet_size_left - PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS - PACKET_HEADER_MIN_SIZE - 1;
00752 
00753             if(frag_len1 < payload_len && avst->codec->codec_type == AVMEDIA_TYPE_AUDIO){
00754                 flush_packet(s);
00755                 continue;
00756             }
00757         }
00758         if (frag_len1 > 0) {
00759             if (payload_len > frag_len1)
00760                 payload_len = frag_len1;
00761             else if (payload_len == (frag_len1 - 1))
00762                 payload_len = frag_len1 - 2;  //additional byte need to put padding length
00763 
00764             put_payload_header(s, stream, timestamp+PREROLL_TIME, m_obj_size, m_obj_offset, payload_len, flags);
00765             avio_write(&asf->pb, buf, payload_len);
00766 
00767             if (asf->multi_payloads_present)
00768                 asf->packet_size_left -= (payload_len + PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS);
00769             else
00770                 asf->packet_size_left -= (payload_len + PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD);
00771             asf->packet_timestamp_end = timestamp;
00772 
00773             asf->packet_nb_payloads++;
00774         } else {
00775             payload_len = 0;
00776         }
00777         m_obj_offset += payload_len;
00778         buf += payload_len;
00779 
00780         if (!asf->multi_payloads_present)
00781             flush_packet(s);
00782         else if (asf->packet_size_left <= (PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS + PACKET_HEADER_MIN_SIZE + 1))
00783             flush_packet(s);
00784     }
00785     stream->seq++;
00786 }
00787 
00788 static int asf_write_packet(AVFormatContext *s, AVPacket *pkt)
00789 {
00790     ASFContext *asf = s->priv_data;
00791     ASFStream *stream;
00792     int64_t duration;
00793     AVCodecContext *codec;
00794     int64_t packet_st,pts;
00795     int start_sec,i;
00796     int flags= pkt->flags;
00797 
00798     codec = s->streams[pkt->stream_index]->codec;
00799     stream = &asf->streams[pkt->stream_index];
00800 
00801     if(codec->codec_type == AVMEDIA_TYPE_AUDIO)
00802         flags &= ~AV_PKT_FLAG_KEY;
00803 
00804     pts = (pkt->pts != AV_NOPTS_VALUE) ? pkt->pts : pkt->dts;
00805     assert(pts != AV_NOPTS_VALUE);
00806     duration = pts * 10000;
00807     asf->duration= FFMAX(asf->duration, duration + pkt->duration * 10000);
00808 
00809     packet_st = asf->nb_packets;
00810     put_frame(s, stream, s->streams[pkt->stream_index], pkt->dts, pkt->data, pkt->size, flags);
00811 
00812     /* check index */
00813     if ((!asf->is_streamed) && (flags & AV_PKT_FLAG_KEY)) {
00814         start_sec = (int)(duration / INT64_C(10000000));
00815         if (start_sec != (int)(asf->last_indexed_pts / INT64_C(10000000))) {
00816             for(i=asf->nb_index_count;i<start_sec;i++) {
00817                 if (i>=asf->nb_index_memory_alloc) {
00818                     asf->nb_index_memory_alloc += ASF_INDEX_BLOCK;
00819                     asf->index_ptr = (ASFIndex*)av_realloc( asf->index_ptr, sizeof(ASFIndex) * asf->nb_index_memory_alloc );
00820                 }
00821                 // store
00822                 asf->index_ptr[i].packet_number = (uint32_t)packet_st;
00823                 asf->index_ptr[i].packet_count  = (uint16_t)(asf->nb_packets-packet_st);
00824                 asf->maximum_packet = FFMAX(asf->maximum_packet, (uint16_t)(asf->nb_packets-packet_st));
00825             }
00826             asf->nb_index_count = start_sec;
00827             asf->last_indexed_pts = duration;
00828         }
00829     }
00830     return 0;
00831 }
00832 
00833 //
00834 static int asf_write_index(AVFormatContext *s, ASFIndex *index, uint16_t max, uint32_t count)
00835 {
00836     AVIOContext *pb = s->pb;
00837     int i;
00838 
00839     put_guid(pb, &ff_asf_simple_index_header);
00840     avio_wl64(pb, 24 + 16 + 8 + 4 + 4 + (4 + 2)*count);
00841     put_guid(pb, &ff_asf_my_guid);
00842     avio_wl64(pb, ASF_INDEXED_INTERVAL);
00843     avio_wl32(pb, max);
00844     avio_wl32(pb, count);
00845     for(i=0; i<count; i++) {
00846         avio_wl32(pb, index[i].packet_number);
00847         avio_wl16(pb, index[i].packet_count);
00848     }
00849 
00850     return 0;
00851 }
00852 
00853 static int asf_write_trailer(AVFormatContext *s)
00854 {
00855     ASFContext *asf = s->priv_data;
00856     int64_t file_size,data_size;
00857 
00858     /* flush the current packet */
00859     if (asf->pb.buf_ptr > asf->pb.buffer)
00860         flush_packet(s);
00861 
00862     /* write index */
00863     data_size = avio_tell(s->pb);
00864     if ((!asf->is_streamed) && (asf->nb_index_count != 0)) {
00865         asf_write_index(s, asf->index_ptr, asf->maximum_packet, asf->nb_index_count);
00866     }
00867     avio_flush(s->pb);
00868 
00869     if (asf->is_streamed || !s->pb->seekable) {
00870         put_chunk(s, 0x4524, 0, 0); /* end of stream */
00871     } else {
00872         /* rewrite an updated header */
00873         file_size = avio_tell(s->pb);
00874         avio_seek(s->pb, 0, SEEK_SET);
00875         asf_write_header1(s, file_size, data_size - asf->data_offset);
00876     }
00877 
00878     avio_flush(s->pb);
00879     av_free(asf->index_ptr);
00880     return 0;
00881 }
00882 
00883 #if CONFIG_ASF_MUXER
00884 AVOutputFormat ff_asf_muxer = {
00885     "asf",
00886     NULL_IF_CONFIG_SMALL("ASF format"),
00887     "video/x-ms-asf",
00888     "asf,wmv,wma",
00889     sizeof(ASFContext),
00890 #if CONFIG_LIBMP3LAME
00891     CODEC_ID_MP3,
00892 #else
00893     CODEC_ID_MP2,
00894 #endif
00895     CODEC_ID_MSMPEG4V3,
00896     asf_write_header,
00897     asf_write_packet,
00898     asf_write_trailer,
00899     .flags = AVFMT_GLOBALHEADER,
00900     .codec_tag= (const AVCodecTag* const []){codec_asf_bmp_tags, ff_codec_bmp_tags, ff_codec_wav_tags, 0},
00901 };
00902 #endif
00903 
00904 #if CONFIG_ASF_STREAM_MUXER
00905 AVOutputFormat ff_asf_stream_muxer = {
00906     "asf_stream",
00907     NULL_IF_CONFIG_SMALL("ASF format"),
00908     "video/x-ms-asf",
00909     "asf,wmv,wma",
00910     sizeof(ASFContext),
00911 #if CONFIG_LIBMP3LAME
00912     CODEC_ID_MP3,
00913 #else
00914     CODEC_ID_MP2,
00915 #endif
00916     CODEC_ID_MSMPEG4V3,
00917     asf_write_stream_header,
00918     asf_write_packet,
00919     asf_write_trailer,
00920     .flags = AVFMT_GLOBALHEADER,
00921     .codec_tag= (const AVCodecTag* const []){codec_asf_bmp_tags, ff_codec_bmp_tags, ff_codec_wav_tags, 0},
00922 };
00923 #endif //CONFIG_ASF_STREAM_MUXER

Generated on Wed Apr 11 2012 07:31:36 for FFmpeg by  doxygen 1.7.1