mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-20 22:41:11 +00:00
223 lines
7.1 KiB
C
223 lines
7.1 KiB
C
/*
|
|
* RTMP packet utilities
|
|
* Copyright (c) 2009 Kostya 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 "avformat.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_SOURCE_CHANNEL, ///< channel for sending a/v to server
|
|
RTMP_VIDEO_CHANNEL = 8, ///< channel for video data
|
|
RTMP_AUDIO_CHANNEL, ///< channel for audio data
|
|
};
|
|
|
|
/**
|
|
* 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 data_size; ///< packet payload size
|
|
} RTMPPacket;
|
|
|
|
/**
|
|
* Creates 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);
|
|
|
|
/**
|
|
* Frees RTMP packet.
|
|
*
|
|
* @param pkt packet
|
|
*/
|
|
void ff_rtmp_packet_destroy(RTMPPacket *pkt);
|
|
|
|
/**
|
|
* Reads 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)
|
|
* @return zero on success, negative value otherwise
|
|
*/
|
|
int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
|
|
int chunk_size, RTMPPacket *prev_pkt);
|
|
|
|
/**
|
|
* Sends 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)
|
|
* @return zero on success, negative value otherwise
|
|
*/
|
|
int ff_rtmp_packet_write(URLContext *h, RTMPPacket *p,
|
|
int chunk_size, RTMPPacket *prev_pkt);
|
|
|
|
/**
|
|
* Prints information and contents of RTMP packet.
|
|
*
|
|
* @param h output context
|
|
* @param p packet to dump
|
|
*/
|
|
void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p);
|
|
|
|
/**
|
|
* @defgroup amffuncs functions used to work with AMF format (which is also used in .flv)
|
|
* @see amf_* funcs in libavformat/flvdec.c
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Calculates 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);
|
|
|
|
/**
|
|
* Retrieves 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);
|
|
|
|
/**
|
|
* Writes 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);
|
|
|
|
/**
|
|
* Writes 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);
|
|
|
|
/**
|
|
* Writes 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);
|
|
|
|
/**
|
|
* Writes AMF NULL value to buffer.
|
|
*
|
|
* @param dst pointer to the input buffer (will be modified)
|
|
*/
|
|
void ff_amf_write_null(uint8_t **dst);
|
|
|
|
/**
|
|
* Writes 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);
|
|
|
|
/**
|
|
* Writes 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);
|
|
|
|
/**
|
|
* Writes 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);
|
|
|
|
/** @} */ // AMF funcs
|
|
|
|
#endif /* AVFORMAT_RTMPPKT_H */
|