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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 timestamp;
43  int64_t duration;
44 
45  int ds_span; /* descrambling */
46  int ds_packet_size;
47  int ds_chunk_size;
48 
49  int64_t packet_pos;
50 
51  uint16_t stream_language_index;
52 
53  int palette_changed;
54  uint32_t palette[256];
55 
56  int payload_ext_ct;
57  ASFPayload payload[8];
58 } ASFStream;
59 
60 typedef struct ASFMainHeader {
61  ff_asf_guid guid; ///< generated by client computer
62  uint64_t file_size; /**< in bytes
63  * invalid if broadcasting */
64  uint64_t create_time; /**< time of creation, in 100-nanosecond units since 1.1.1601
65  * invalid if broadcasting */
66  uint64_t play_time; /**< play time, in 100-nanosecond units
67  * invalid if broadcasting */
68  uint64_t send_time; /**< time to send file, in 100-nanosecond units
69  * invalid if broadcasting (could be ignored) */
70  uint32_t preroll; /**< timestamp of the first packet, in milliseconds
71  * if nonzero - subtract from time */
72  uint32_t ignore; ///< preroll is 64bit - but let's just ignore it
73  uint32_t flags; /**< 0x01 - broadcast
74  * 0x02 - seekable
75  * rest is reserved should be 0 */
76  uint32_t min_pktsize; /**< size of a data packet
77  * invalid if broadcasting */
78  uint32_t max_pktsize; /**< shall be the same as for min_pktsize
79  * invalid if broadcasting */
80  uint32_t max_bitrate; /**< bandwidth of stream in bps
81  * should be the sum of bitrates of the
82  * individual media streams */
83 } ASFMainHeader;
84 
85 
86 typedef struct ASFIndex {
87  uint32_t packet_number;
88  uint16_t packet_count;
89 } ASFIndex;
90 
91 extern const ff_asf_guid ff_asf_header;
92 extern const ff_asf_guid ff_asf_file_header;
93 extern const ff_asf_guid ff_asf_stream_header;
94 extern const ff_asf_guid ff_asf_ext_stream_header;
95 extern const ff_asf_guid ff_asf_audio_stream;
96 extern const ff_asf_guid ff_asf_audio_conceal_none;
97 extern const ff_asf_guid ff_asf_audio_conceal_spread;
98 extern const ff_asf_guid ff_asf_video_stream;
99 extern const ff_asf_guid ff_asf_jfif_media;
100 extern const ff_asf_guid ff_asf_video_conceal_none;
101 extern const ff_asf_guid ff_asf_command_stream;
102 extern const ff_asf_guid ff_asf_comment_header;
103 extern const ff_asf_guid ff_asf_codec_comment_header;
104 extern const ff_asf_guid ff_asf_codec_comment1_header;
105 extern const ff_asf_guid ff_asf_data_header;
106 extern const ff_asf_guid ff_asf_head1_guid;
107 extern const ff_asf_guid ff_asf_head2_guid;
108 extern const ff_asf_guid ff_asf_extended_content_header;
109 extern const ff_asf_guid ff_asf_simple_index_header;
110 extern const ff_asf_guid ff_asf_ext_stream_embed_stream_header;
111 extern const ff_asf_guid ff_asf_ext_stream_audio_stream;
112 extern const ff_asf_guid ff_asf_metadata_header;
113 extern const ff_asf_guid ff_asf_metadata_library_header;
114 extern const ff_asf_guid ff_asf_marker_header;
115 extern const ff_asf_guid ff_asf_my_guid;
116 extern const ff_asf_guid ff_asf_language_guid;
117 extern const ff_asf_guid ff_asf_content_encryption;
118 extern const ff_asf_guid ff_asf_ext_content_encryption;
119 extern const ff_asf_guid ff_asf_digital_signature;
120 
121 extern const AVMetadataConv ff_asf_metadata_conv[];
122 
123 #define ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT 0x80 //1000 0000
124 
125 
126 // ASF data packet structure
127 // =========================
128 //
129 //
130 // -----------------------------------
131 // | Error Correction Data | Optional
132 // -----------------------------------
133 // | Payload Parsing Information (PPI) |
134 // -----------------------------------
135 // | Payload Data |
136 // -----------------------------------
137 // | Padding Data |
138 // -----------------------------------
139 
140 
141 // PPI_FLAG - Payload parsing information flags
142 #define ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT 1
143 
144 #define ASF_PPI_FLAG_SEQUENCE_FIELD_IS_BYTE 0x02 //0000 0010
145 #define ASF_PPI_FLAG_SEQUENCE_FIELD_IS_WORD 0x04 //0000 0100
146 #define ASF_PPI_FLAG_SEQUENCE_FIELD_IS_DWORD 0x06 //0000 0110
147 #define ASF_PPI_MASK_SEQUENCE_FIELD_SIZE 0x06 //0000 0110
148 
149 #define ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE 0x08 //0000 1000
150 #define ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD 0x10 //0001 0000
151 #define ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_DWORD 0x18 //0001 1000
152 #define ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE 0x18 //0001 1000
153 
154 #define ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_BYTE 0x20 //0010 0000
155 #define ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_WORD 0x40 //0100 0000
156 #define ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_DWORD 0x60 //0110 0000
157 #define ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE 0x60 //0110 0000
158 
159 // PL_FLAG - Payload flags
160 #define ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_BYTE 0x01 //0000 0001
161 #define ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_WORD 0x02 //0000 0010
162 #define ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_DWORD 0x03 //0000 0011
163 #define ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE 0x03 //0000 0011
164 
165 #define ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_BYTE 0x04 //0000 0100
166 #define ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_WORD 0x08 //0000 1000
167 #define ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_DWORD 0x0c //0000 1100
168 #define ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE 0x0c //0000 1100
169 
170 #define ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_BYTE 0x10 //0001 0000
171 #define ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_WORD 0x20 //0010 0000
172 #define ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_DWORD 0x30 //0011 0000
173 #define ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE 0x30 //0011 0000
174 
175 #define ASF_PL_FLAG_STREAM_NUMBER_LENGTH_FIELD_IS_BYTE 0x40 //0100 0000
176 #define ASF_PL_MASK_STREAM_NUMBER_LENGTH_FIELD_SIZE 0xc0 //1100 0000
177 
178 #define ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_BYTE 0x40 //0100 0000
179 #define ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_WORD 0x80 //1000 0000
180 #define ASF_PL_MASK_PAYLOAD_LENGTH_FIELD_SIZE 0xc0 //1100 0000
181 
182 #define ASF_PL_FLAG_KEY_FRAME 0x80 //1000 0000
183 
184 extern AVInputFormat ff_asf_demuxer;
185 
186 void ff_put_guid(AVIOContext *s, const ff_asf_guid *g);
187 
188 #endif /* AVFORMAT_ASF_H */
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