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280 lines
8.8 KiB
C
280 lines
8.8 KiB
C
/*
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* RTMP packet utilities
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* Copyright (c) 2009 Kostya Shishkov
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_RTMPPKT_H
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#define AVFORMAT_RTMPPKT_H
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "url.h"
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/** maximum possible number of different RTMP channels */
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#define RTMP_CHANNELS 65599
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/**
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* channels used to for RTMP packets with different purposes (i.e. data, network
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* control, remote procedure calls, etc.)
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*/
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enum RTMPChannel {
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RTMP_NETWORK_CHANNEL = 2, ///< channel for network-related messages (bandwidth report, ping, etc)
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RTMP_SYSTEM_CHANNEL, ///< channel for sending server control messages
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RTMP_SOURCE_CHANNEL, ///< channel for sending a/v to server
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RTMP_VIDEO_CHANNEL = 8, ///< channel for video data
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RTMP_AUDIO_CHANNEL, ///< channel for audio data
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};
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/**
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* known RTMP packet types
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*/
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typedef enum RTMPPacketType {
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RTMP_PT_CHUNK_SIZE = 1, ///< chunk size change
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RTMP_PT_BYTES_READ = 3, ///< number of bytes read
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RTMP_PT_PING, ///< ping
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RTMP_PT_SERVER_BW, ///< server bandwidth
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RTMP_PT_CLIENT_BW, ///< client bandwidth
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RTMP_PT_AUDIO = 8, ///< audio packet
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RTMP_PT_VIDEO, ///< video packet
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RTMP_PT_FLEX_STREAM = 15, ///< Flex shared stream
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RTMP_PT_FLEX_OBJECT, ///< Flex shared object
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RTMP_PT_FLEX_MESSAGE, ///< Flex shared message
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RTMP_PT_NOTIFY, ///< some notification
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RTMP_PT_SHARED_OBJ, ///< shared object
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RTMP_PT_INVOKE, ///< invoke some stream action
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RTMP_PT_METADATA = 22, ///< FLV metadata
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} RTMPPacketType;
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/**
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* possible RTMP packet header sizes
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*/
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enum RTMPPacketSize {
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RTMP_PS_TWELVEBYTES = 0, ///< packet has 12-byte header
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RTMP_PS_EIGHTBYTES, ///< packet has 8-byte header
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RTMP_PS_FOURBYTES, ///< packet has 4-byte header
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RTMP_PS_ONEBYTE ///< packet is really a next chunk of a packet
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};
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/**
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* structure for holding RTMP packets
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*/
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typedef struct RTMPPacket {
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int channel_id; ///< RTMP channel ID (nothing to do with audio/video channels though)
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RTMPPacketType type; ///< packet payload type
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uint32_t timestamp; ///< packet full timestamp
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uint32_t ts_delta; ///< timestamp increment to the previous one in milliseconds (latter only for media packets)
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uint32_t extra; ///< probably an additional channel ID used during streaming data
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uint8_t *data; ///< packet payload
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int data_size; ///< packet payload size
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} RTMPPacket;
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/**
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* Create new RTMP packet with given attributes.
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*
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* @param pkt packet
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* @param channel_id packet channel ID
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* @param type packet type
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* @param timestamp packet timestamp
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* @param size packet size
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* @return zero on success, negative value otherwise
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*/
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int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
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int timestamp, int size);
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/**
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* Free RTMP packet.
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*
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* @param pkt packet
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*/
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void ff_rtmp_packet_destroy(RTMPPacket *pkt);
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/**
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* Read RTMP packet sent by the server.
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*
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* @param h reader context
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* @param p packet
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* @param chunk_size current chunk size
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* @param prev_pkt previously read packet headers for all channels
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* (may be needed for restoring incomplete packet header)
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* @return number of bytes read on success, negative value otherwise
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*/
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int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
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int chunk_size, RTMPPacket *prev_pkt);
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/**
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* Read internal RTMP packet sent by the server.
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*
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* @param h reader context
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* @param p packet
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* @param chunk_size current chunk size
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* @param prev_pkt previously read packet headers for all channels
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* (may be needed for restoring incomplete packet header)
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* @param c the first byte already read
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* @return number of bytes read on success, negative value otherwise
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*/
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int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
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RTMPPacket *prev_pkt, uint8_t c);
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/**
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* Send RTMP packet to the server.
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*
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* @param h reader context
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* @param p packet to send
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* @param chunk_size current chunk size
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* @param prev_pkt previously sent packet headers for all channels
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* (may be used for packet header compressing)
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* @return number of bytes written on success, negative value otherwise
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*/
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int ff_rtmp_packet_write(URLContext *h, RTMPPacket *p,
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int chunk_size, RTMPPacket *prev_pkt);
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/**
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* Print information and contents of RTMP packet.
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*
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* @param ctx output context
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* @param p packet to dump
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*/
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void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p);
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/**
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* @name Functions used to work with the AMF format (which is also used in .flv)
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* @see amf_* funcs in libavformat/flvdec.c
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* @{
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*/
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/**
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* Calculate number of bytes taken by first AMF entry in data.
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*
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* @param data input data
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* @param data_end input buffer end
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* @return number of bytes used by first AMF entry
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*/
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int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end);
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/**
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* Retrieve value of given AMF object field in string form.
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*
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* @param data AMF object data
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* @param data_end input buffer end
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* @param name name of field to retrieve
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* @param dst buffer for storing result
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* @param dst_size output buffer size
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* @return 0 if search and retrieval succeeded, negative value otherwise
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*/
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int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
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const uint8_t *name, uint8_t *dst, int dst_size);
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/**
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* Write boolean value in AMF format to buffer.
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*
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* @param dst pointer to the input buffer (will be modified)
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* @param val value to write
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*/
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void ff_amf_write_bool(uint8_t **dst, int val);
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/**
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* Write number in AMF format to buffer.
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*
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* @param dst pointer to the input buffer (will be modified)
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* @param num value to write
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*/
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void ff_amf_write_number(uint8_t **dst, double num);
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/**
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* Write string in AMF format to buffer.
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*
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* @param dst pointer to the input buffer (will be modified)
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* @param str string to write
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*/
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void ff_amf_write_string(uint8_t **dst, const char *str);
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/**
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* Write AMF NULL value to buffer.
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*
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* @param dst pointer to the input buffer (will be modified)
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*/
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void ff_amf_write_null(uint8_t **dst);
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/**
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* Write marker for AMF object to buffer.
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*
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* @param dst pointer to the input buffer (will be modified)
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*/
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void ff_amf_write_object_start(uint8_t **dst);
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/**
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* Write string used as field name in AMF object to buffer.
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*
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* @param dst pointer to the input buffer (will be modified)
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* @param str string to write
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*/
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void ff_amf_write_field_name(uint8_t **dst, const char *str);
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/**
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* Write marker for end of AMF object to buffer.
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*
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* @param dst pointer to the input buffer (will be modified)
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*/
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void ff_amf_write_object_end(uint8_t **dst);
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/**
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* Read AMF boolean value.
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*
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*@param[in,out] gbc GetByteContext initialized with AMF-formatted data
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*@param[out] val 0 or 1
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*@return 0 on success or an AVERROR code on failure
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*/
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int ff_amf_read_bool(GetByteContext *gbc, int *val);
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/**
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* Read AMF number value.
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*
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*@param[in,out] gbc GetByteContext initialized with AMF-formatted data
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*@param[out] val read value
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*@return 0 on success or an AVERROR code on failure
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*/
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int ff_amf_read_number(GetByteContext *gbc, double *val);
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/**
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* Read AMF string value.
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*
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* Appends a trailing \0 to output string in order to
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* ease later parsing.
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*
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*@param[in,out] gbc GetByteContext initialized with AMF-formatted data
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*@param[out] str read string
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*@param[in] strsize buffer size available to store the read string
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*@param[out] length read string length
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*@return 0 on success or an AVERROR code on failure
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*/
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int ff_amf_read_string(GetByteContext *gbc, uint8_t *str,
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int strsize, int *length);
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/**
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* Read AMF NULL value.
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*
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*@param[in,out] gbc GetByteContext initialized with AMF-formatted data
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*@return 0 on success or an AVERROR code on failure
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*/
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int ff_amf_read_null(GetByteContext *gbc);
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/** @} */ // AMF funcs
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#endif /* AVFORMAT_RTMPPKT_H */
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