summaryrefslogtreecommitdiffstats
path: root/libavformat/rtmppkt.h
blob: fb79fedac64f12788b64bb582690b51060a2c41f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
/*
 * RTMP packet utilities
 * Copyright (c) 2009 Konstantin Shishkov
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVFORMAT_RTMPPKT_H
#define AVFORMAT_RTMPPKT_H

#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "url.h"

/** maximum possible number of different RTMP channels */
#define RTMP_CHANNELS 65599

/**
 * channels used to for RTMP packets with different purposes (i.e. data, network
 * control, remote procedure calls, etc.)
 */
enum RTMPChannel {
    RTMP_NETWORK_CHANNEL = 2,   ///< channel for network-related messages (bandwidth report, ping, etc)
    RTMP_SYSTEM_CHANNEL,        ///< channel for sending server control messages
    RTMP_AUDIO_CHANNEL,         ///< channel for audio data
    RTMP_VIDEO_CHANNEL   = 6,   ///< channel for video data
    RTMP_SOURCE_CHANNEL  = 8,   ///< channel for a/v invokes
};

/**
 * known RTMP packet types
 */
typedef enum RTMPPacketType {
    RTMP_PT_CHUNK_SIZE   =  1,  ///< chunk size change
    RTMP_PT_BYTES_READ   =  3,  ///< number of bytes read
    RTMP_PT_PING,               ///< ping
    RTMP_PT_SERVER_BW,          ///< server bandwidth
    RTMP_PT_CLIENT_BW,          ///< client bandwidth
    RTMP_PT_AUDIO        =  8,  ///< audio packet
    RTMP_PT_VIDEO,              ///< video packet
    RTMP_PT_FLEX_STREAM  = 15,  ///< Flex shared stream
    RTMP_PT_FLEX_OBJECT,        ///< Flex shared object
    RTMP_PT_FLEX_MESSAGE,       ///< Flex shared message
    RTMP_PT_NOTIFY,             ///< some notification
    RTMP_PT_SHARED_OBJ,         ///< shared object
    RTMP_PT_INVOKE,             ///< invoke some stream action
    RTMP_PT_METADATA     = 22,  ///< FLV metadata
} RTMPPacketType;

/**
 * possible RTMP packet header sizes
 */
enum RTMPPacketSize {
    RTMP_PS_TWELVEBYTES = 0, ///< packet has 12-byte header
    RTMP_PS_EIGHTBYTES,      ///< packet has 8-byte header
    RTMP_PS_FOURBYTES,       ///< packet has 4-byte header
    RTMP_PS_ONEBYTE          ///< packet is really a next chunk of a packet
};

/**
 * structure for holding RTMP packets
 */
typedef struct RTMPPacket {
    int            channel_id; ///< RTMP channel ID (nothing to do with audio/video channels though)
    RTMPPacketType type;       ///< packet payload type
    uint32_t       timestamp;  ///< packet full timestamp
    uint32_t       ts_delta;   ///< timestamp increment to the previous one in milliseconds (latter only for media packets)
    uint32_t       extra;      ///< probably an additional channel ID used during streaming data
    uint8_t        *data;      ///< packet payload
    int            size;       ///< packet payload size
    int            offset;     ///< amount of data read so far
    int            read;       ///< amount read, including headers
} RTMPPacket;

/**
 * Create new RTMP packet with given attributes.
 *
 * @param pkt        packet
 * @param channel_id packet channel ID
 * @param type       packet type
 * @param timestamp  packet timestamp
 * @param size       packet size
 * @return zero on success, negative value otherwise
 */
int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
                          int timestamp, int size);

/**
 * Free RTMP packet.
 *
 * @param pkt packet
 */
void ff_rtmp_packet_destroy(RTMPPacket *pkt);

/**
 * Read RTMP packet sent by the server.
 *
 * @param h          reader context
 * @param p          packet
 * @param chunk_size current chunk size
 * @param prev_pkt   previously read packet headers for all channels
 *                   (may be needed for restoring incomplete packet header)
 * @param nb_prev_pkt number of allocated elements in prev_pkt
 * @return number of bytes read on success, negative value otherwise
 */
int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
                        int chunk_size, RTMPPacket **prev_pkt,
                        int *nb_prev_pkt);
/**
 * Read internal RTMP packet sent by the server.
 *
 * @param h          reader context
 * @param p          packet
 * @param chunk_size current chunk size
 * @param prev_pkt   previously read packet headers for all channels
 *                   (may be needed for restoring incomplete packet header)
 * @param nb_prev_pkt number of allocated elements in prev_pkt
 * @param c          the first byte already read
 * @return number of bytes read on success, negative value otherwise
 */
int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
                                 RTMPPacket **prev_pkt, int *nb_prev_pkt,
                                 uint8_t c);

/**
 * Send RTMP packet to the server.
 *
 * @param h          reader context
 * @param p          packet to send
 * @param chunk_size current chunk size
 * @param prev_pkt   previously sent packet headers for all channels
 *                   (may be used for packet header compressing)
 * @param nb_prev_pkt number of allocated elements in prev_pkt
 * @return number of bytes written on success, negative value otherwise
 */
int ff_rtmp_packet_write(URLContext *h, RTMPPacket *p,
                         int chunk_size, RTMPPacket **prev_pkt,
                         int *nb_prev_pkt);

/**
 * Print information and contents of RTMP packet.
 *
 * @param ctx        output context
 * @param p          packet to dump
 */
void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p);

/**
 * Enlarge the prev_pkt array to fit the given channel
 *
 * @param prev_pkt    array with previously sent packet headers
 * @param nb_prev_pkt number of allocated elements in prev_pkt
 * @param channel     the channel number that needs to be allocated
 */
int ff_rtmp_check_alloc_array(RTMPPacket **prev_pkt, int *nb_prev_pkt,
                              int channel);

/**
 * @name Functions used to work with the AMF format (which is also used in .flv)
 * @see amf_* funcs in libavformat/flvdec.c
 * @{
 */

/**
 * Calculate number of bytes taken by first AMF entry in data.
 *
 * @param data input data
 * @param data_end input buffer end
 * @return number of bytes used by first AMF entry
 */
int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end);

/**
 * Retrieve value of given AMF object field in string form.
 *
 * @param data     AMF object data
 * @param data_end input buffer end
 * @param name     name of field to retrieve
 * @param dst      buffer for storing result
 * @param dst_size output buffer size
 * @return 0 if search and retrieval succeeded, negative value otherwise
 */
int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
                           const uint8_t *name, uint8_t *dst, int dst_size);

/**
 * Write boolean value in AMF format to buffer.
 *
 * @param dst pointer to the input buffer (will be modified)
 * @param val value to write
 */
void ff_amf_write_bool(uint8_t **dst, int val);

/**
 * Write number in AMF format to buffer.
 *
 * @param dst pointer to the input buffer (will be modified)
 * @param num value to write
 */
void ff_amf_write_number(uint8_t **dst, double num);

/**
 * Write string in AMF format to buffer.
 *
 * @param dst pointer to the input buffer (will be modified)
 * @param str string to write
 */
void ff_amf_write_string(uint8_t **dst, const char *str);

/**
 * Write a string consisting of two parts in AMF format to a buffer.
 *
 * @param dst pointer to the input buffer (will be modified)
 * @param str1 first string to write, may be null
 * @param str2 second string to write, may be null
 */
void ff_amf_write_string2(uint8_t **dst, const char *str1, const char *str2);

/**
 * Write AMF NULL value to buffer.
 *
 * @param dst pointer to the input buffer (will be modified)
 */
void ff_amf_write_null(uint8_t **dst);

/**
 * Write marker for AMF object to buffer.
 *
 * @param dst pointer to the input buffer (will be modified)
 */
void ff_amf_write_object_start(uint8_t **dst);

/**
 * Write string used as field name in AMF object to buffer.
 *
 * @param dst pointer to the input buffer (will be modified)
 * @param str string to write
 */
void ff_amf_write_field_name(uint8_t **dst, const char *str);

/**
 * Write marker for end of AMF object to buffer.
 *
 * @param dst pointer to the input buffer (will be modified)
 */
void ff_amf_write_object_end(uint8_t **dst);

/**
 * Read AMF boolean value.
 *
 *@param[in,out] gbc GetByteContext initialized with AMF-formatted data
 *@param[out]    val 0 or 1
 *@return 0 on success or an AVERROR code on failure
*/
int ff_amf_read_bool(GetByteContext *gbc, int *val);

/**
 * Read AMF number value.
 *
 *@param[in,out] gbc GetByteContext initialized with AMF-formatted data
 *@param[out]    val read value
 *@return 0 on success or an AVERROR code on failure
*/
int ff_amf_read_number(GetByteContext *gbc, double *val);

/**
 * Read AMF string value.
 *
 * Appends a trailing null byte to output string in order to
 * ease later parsing.
 *
 *@param[in,out] gbc     GetByteContext initialized with AMF-formatted data
 *@param[out]    str     read string
 *@param[in]     strsize buffer size available to store the read string
 *@param[out]    length  read string length
 *@return 0 on success or an AVERROR code on failure
*/
int ff_amf_read_string(GetByteContext *gbc, uint8_t *str,
                       int strsize, int *length);

/**
 * Read AMF NULL value.
 *
 *@param[in,out] gbc GetByteContext initialized with AMF-formatted data
 *@return 0 on success or an AVERROR code on failure
*/
int ff_amf_read_null(GetByteContext *gbc);

/**
 * Match AMF string with a NULL-terminated string.
 *
 * @return 0 if the strings do not match.
 */

int ff_amf_match_string(const uint8_t *data, int size, const char *str);

/** @} */ // AMF funcs

#endif /* AVFORMAT_RTMPPKT_H */
OpenPOWER on IntegriCloud