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asf.h
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1 /*
2  * Copyright (c) 2000, 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVFORMAT_ASF_H
22 #define AVFORMAT_ASF_H
23 
24 #include <stdint.h>
25 #include "avformat.h"
26 #include "metadata.h"
27 #include "riff.h"
28 
29 #define PACKET_SIZE 3200
30 
31 typedef struct ASFPayload {
32  uint8_t type;
33  uint16_t size;
34 } ASFPayload;
35 
36 typedef struct ASFStream {
37  int num;
38  unsigned char seq;
39  /* use for reading */
40  AVPacket pkt;
41  int frag_offset;
42  int packet_obj_size;
43  int timestamp;
44  int64_t duration;
45  int skip_to_key;
46  int pkt_clean;
47 
48  int ds_span; /* descrambling */
49  int ds_packet_size;
50  int ds_chunk_size;
51 
52  int64_t packet_pos;
53 
54  uint16_t stream_language_index;
55 
56  int palette_changed;
57  uint32_t palette[256];
58 
59  int payload_ext_ct;
60  ASFPayload payload[8];
61 } ASFStream;
62 
63 typedef struct ASFMainHeader {
64  ff_asf_guid guid; ///< generated by client computer
65  uint64_t file_size; /**< in bytes
66  * invalid if broadcasting */
67  uint64_t create_time; /**< time of creation, in 100-nanosecond units since 1.1.1601
68  * invalid if broadcasting */
69  uint64_t play_time; /**< play time, in 100-nanosecond units
70  * invalid if broadcasting */
71  uint64_t send_time; /**< time to send file, in 100-nanosecond units
72  * invalid if broadcasting (could be ignored) */
73  uint32_t preroll; /**< timestamp of the first packet, in milliseconds
74  * if nonzero - subtract from time */
75  uint32_t ignore; ///< preroll is 64bit - but let's just ignore it
76  uint32_t flags; /**< 0x01 - broadcast
77  * 0x02 - seekable
78  * rest is reserved should be 0 */
79  uint32_t min_pktsize; /**< size of a data packet
80  * invalid if broadcasting */
81  uint32_t max_pktsize; /**< shall be the same as for min_pktsize
82  * invalid if broadcasting */
83  uint32_t max_bitrate; /**< bandwidth of stream in bps
84  * should be the sum of bitrates of the
85  * individual media streams */
86 } ASFMainHeader;
87 
88 
89 typedef struct ASFIndex {
90  uint32_t packet_number;
91  uint16_t packet_count;
92  uint64_t send_time;
93  uint64_t offset;
94 } ASFIndex;
95 
96 extern const ff_asf_guid ff_asf_header;
97 extern const ff_asf_guid ff_asf_file_header;
98 extern const ff_asf_guid ff_asf_stream_header;
99 extern const ff_asf_guid ff_asf_ext_stream_header;
100 extern const ff_asf_guid ff_asf_audio_stream;
101 extern const ff_asf_guid ff_asf_audio_conceal_none;
102 extern const ff_asf_guid ff_asf_audio_conceal_spread;
103 extern const ff_asf_guid ff_asf_video_stream;
104 extern const ff_asf_guid ff_asf_jfif_media;
105 extern const ff_asf_guid ff_asf_video_conceal_none;
106 extern const ff_asf_guid ff_asf_command_stream;
107 extern const ff_asf_guid ff_asf_comment_header;
108 extern const ff_asf_guid ff_asf_codec_comment_header;
109 extern const ff_asf_guid ff_asf_codec_comment1_header;
110 extern const ff_asf_guid ff_asf_data_header;
111 extern const ff_asf_guid ff_asf_head1_guid;
112 extern const ff_asf_guid ff_asf_head2_guid;
113 extern const ff_asf_guid ff_asf_extended_content_header;
114 extern const ff_asf_guid ff_asf_simple_index_header;
115 extern const ff_asf_guid ff_asf_ext_stream_embed_stream_header;
116 extern const ff_asf_guid ff_asf_ext_stream_audio_stream;
117 extern const ff_asf_guid ff_asf_metadata_header;
118 extern const ff_asf_guid ff_asf_metadata_library_header;
119 extern const ff_asf_guid ff_asf_marker_header;
120 extern const ff_asf_guid ff_asf_reserved_4;
121 extern const ff_asf_guid ff_asf_my_guid;
122 extern const ff_asf_guid ff_asf_language_guid;
123 extern const ff_asf_guid ff_asf_content_encryption;
124 extern const ff_asf_guid ff_asf_ext_content_encryption;
125 extern const ff_asf_guid ff_asf_digital_signature;
126 
127 extern const AVMetadataConv ff_asf_metadata_conv[];
128 
129 #define ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT 0x80 //1000 0000
130 
131 
132 // ASF data packet structure
133 // =========================
134 //
135 //
136 // -----------------------------------
137 // | Error Correction Data | Optional
138 // -----------------------------------
139 // | Payload Parsing Information (PPI) |
140 // -----------------------------------
141 // | Payload Data |
142 // -----------------------------------
143 // | Padding Data |
144 // -----------------------------------
145 
146 
147 // PPI_FLAG - Payload parsing information flags
148 #define ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT 1
149 
150 #define ASF_PPI_FLAG_SEQUENCE_FIELD_IS_BYTE 0x02 //0000 0010
151 #define ASF_PPI_FLAG_SEQUENCE_FIELD_IS_WORD 0x04 //0000 0100
152 #define ASF_PPI_FLAG_SEQUENCE_FIELD_IS_DWORD 0x06 //0000 0110
153 #define ASF_PPI_MASK_SEQUENCE_FIELD_SIZE 0x06 //0000 0110
154 
155 #define ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE 0x08 //0000 1000
156 #define ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD 0x10 //0001 0000
157 #define ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_DWORD 0x18 //0001 1000
158 #define ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE 0x18 //0001 1000
159 
160 #define ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_BYTE 0x20 //0010 0000
161 #define ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_WORD 0x40 //0100 0000
162 #define ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_DWORD 0x60 //0110 0000
163 #define ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE 0x60 //0110 0000
164 
165 // PL_FLAG - Payload flags
166 #define ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_BYTE 0x01 //0000 0001
167 #define ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_WORD 0x02 //0000 0010
168 #define ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_DWORD 0x03 //0000 0011
169 #define ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE 0x03 //0000 0011
170 
171 #define ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_BYTE 0x04 //0000 0100
172 #define ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_WORD 0x08 //0000 1000
173 #define ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_DWORD 0x0c //0000 1100
174 #define ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE 0x0c //0000 1100
175 
176 #define ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_BYTE 0x10 //0001 0000
177 #define ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_WORD 0x20 //0010 0000
178 #define ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_DWORD 0x30 //0011 0000
179 #define ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE 0x30 //0011 0000
180 
181 #define ASF_PL_FLAG_STREAM_NUMBER_LENGTH_FIELD_IS_BYTE 0x40 //0100 0000
182 #define ASF_PL_MASK_STREAM_NUMBER_LENGTH_FIELD_SIZE 0xc0 //1100 0000
183 
184 #define ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_BYTE 0x40 //0100 0000
185 #define ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_WORD 0x80 //1000 0000
186 #define ASF_PL_MASK_PAYLOAD_LENGTH_FIELD_SIZE 0xc0 //1100 0000
187 
188 #define ASF_PL_FLAG_KEY_FRAME 0x80 //1000 0000
189 
190 extern AVInputFormat ff_asf_demuxer;
191 
192 #endif /* AVFORMAT_ASF_H */
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