1 /* Copyright (C) 2002 Jean-Marc Valin */ 2 /** 3 @file speex_jitter.h 4 @brief Adaptive jitter buffer for Speex 5 */ 6 /* 7 Redistribution and use in source and binary forms, with or without 8 modification, are permitted provided that the following conditions 9 are met: 10 11 - Redistributions of source code must retain the above copyright 12 notice, this list of conditions and the following disclaimer. 13 14 - Redistributions in binary form must reproduce the above copyright 15 notice, this list of conditions and the following disclaimer in the 16 documentation and/or other materials provided with the distribution. 17 18 - Neither the name of the Xiph.org Foundation nor the names of its 19 contributors may be used to endorse or promote products derived from 20 this software without specific prior written permission. 21 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 34 */ 35 36 #ifndef SPEEX_JITTER_H 37 #define SPEEX_JITTER_H 38 /** @defgroup JitterBuffer JitterBuffer: Adaptive jitter buffer 39 * This is the jitter buffer that reorders UDP/RTP packets and adjusts the buffer size 40 * to maintain good quality and low latency. 41 * @{ 42 */ 43 44 #include "speex/speex_types.h" 45 46 #ifdef __cplusplus 47 extern "C" { 48 #endif 49 50 /** Generic adaptive jitter buffer state */ 51 struct JitterBuffer_; 52 53 /** Generic adaptive jitter buffer state */ 54 typedef struct JitterBuffer_ JitterBuffer; 55 56 /** Definition of an incoming packet */ 57 typedef struct _JitterBufferPacket JitterBufferPacket; 58 59 /** Definition of an incoming packet */ 60 struct _JitterBufferPacket { 61 char *data; /**< Data bytes contained in the packet */ 62 spx_uint32_t len; /**< Length of the packet in bytes */ 63 spx_uint32_t timestamp; /**< Timestamp for the packet */ 64 spx_uint32_t span; /**< Time covered by the packet (same units as timestamp) */ 65 spx_uint16_t sequence; /**< RTP Sequence number if available (0 otherwise) */ 66 spx_uint32_t user_data; /**< Put whatever data you like here (it's ignored by the jitter buffer) */ 67 }; 68 69 /** Packet has been retrieved */ 70 #define JITTER_BUFFER_OK 0 71 /** Packet is lost or is late */ 72 #define JITTER_BUFFER_MISSING 1 73 /** A "fake" packet is meant to be inserted here to increase buffering */ 74 #define JITTER_BUFFER_INSERTION 2 75 /** There was an error in the jitter buffer */ 76 #define JITTER_BUFFER_INTERNAL_ERROR -1 77 /** Invalid argument */ 78 #define JITTER_BUFFER_BAD_ARGUMENT -2 79 80 81 /** Set minimum amount of extra buffering required (margin) */ 82 #define JITTER_BUFFER_SET_MARGIN 0 83 /** Get minimum amount of extra buffering required (margin) */ 84 #define JITTER_BUFFER_GET_MARGIN 1 85 /* JITTER_BUFFER_SET_AVAILABLE_COUNT wouldn't make sense */ 86 87 /** Get the amount of available packets currently buffered */ 88 #define JITTER_BUFFER_GET_AVAILABLE_COUNT 3 89 /** Included because of an early misspelling (will remove in next release) */ 90 #define JITTER_BUFFER_GET_AVALIABLE_COUNT 3 91 92 /** Assign a function to destroy unused packet. When setting that, the jitter 93 buffer no longer copies packet data. */ 94 #define JITTER_BUFFER_SET_DESTROY_CALLBACK 4 95 /** */ 96 #define JITTER_BUFFER_GET_DESTROY_CALLBACK 5 97 98 /** Tell the jitter buffer to only adjust the delay in multiples of the step parameter provided */ 99 #define JITTER_BUFFER_SET_DELAY_STEP 6 100 /** */ 101 #define JITTER_BUFFER_GET_DELAY_STEP 7 102 103 /** Tell the jitter buffer to only do concealment in multiples of the size parameter provided */ 104 #define JITTER_BUFFER_SET_CONCEALMENT_SIZE 8 105 #define JITTER_BUFFER_GET_CONCEALMENT_SIZE 9 106 107 /** Absolute max amount of loss that can be tolerated regardless of the delay. Typical loss 108 should be half of that or less. */ 109 #define JITTER_BUFFER_SET_MAX_LATE_RATE 10 110 #define JITTER_BUFFER_GET_MAX_LATE_RATE 11 111 112 /** Equivalent cost of one percent late packet in timestamp units */ 113 #define JITTER_BUFFER_SET_LATE_COST 12 114 #define JITTER_BUFFER_GET_LATE_COST 13 115 116 117 /** Initialises jitter buffer 118 * 119 * @param step_size Starting value for the size of concleanment packets and delay 120 adjustment steps. Can be changed at any time using JITTER_BUFFER_SET_DELAY_STEP 121 and JITTER_BUFFER_GET_CONCEALMENT_SIZE. 122 * @return Newly created jitter buffer state 123 */ 124 JitterBuffer *jitter_buffer_init(int step_size); 125 126 /** Restores jitter buffer to its original state 127 * 128 * @param jitter Jitter buffer state 129 */ 130 void jitter_buffer_reset(JitterBuffer *jitter); 131 132 /** Destroys jitter buffer 133 * 134 * @param jitter Jitter buffer state 135 */ 136 void jitter_buffer_destroy(JitterBuffer *jitter); 137 138 /** Put one packet into the jitter buffer 139 * 140 * @param jitter Jitter buffer state 141 * @param packet Incoming packet 142 */ 143 void jitter_buffer_put(JitterBuffer *jitter, const JitterBufferPacket *packet); 144 145 /** Get one packet from the jitter buffer 146 * 147 * @param jitter Jitter buffer state 148 * @param packet Returned packet 149 * @param desired_span Number of samples (or units) we wish to get from the buffer (no guarantee) 150 * @param current_timestamp Timestamp for the returned packet 151 */ 152 int jitter_buffer_get(JitterBuffer *jitter, JitterBufferPacket *packet, spx_int32_t desired_span, spx_int32_t *start_offset); 153 154 /** Used right after jitter_buffer_get() to obtain another packet that would have the same timestamp. 155 * This is mainly useful for media where a single "frame" can be split into several packets. 156 * 157 * @param jitter Jitter buffer state 158 * @param packet Returned packet 159 */ 160 int jitter_buffer_get_another(JitterBuffer *jitter, JitterBufferPacket *packet); 161 162 /** Get pointer timestamp of jitter buffer 163 * 164 * @param jitter Jitter buffer state 165 */ 166 int jitter_buffer_get_pointer_timestamp(JitterBuffer *jitter); 167 168 /** Advance by one tick 169 * 170 * @param jitter Jitter buffer state 171 */ 172 void jitter_buffer_tick(JitterBuffer *jitter); 173 174 /** Telling the jitter buffer about the remaining data in the application buffer 175 * @param jitter Jitter buffer state 176 * @param rem Amount of data buffered by the application (timestamp units) 177 */ 178 void jitter_buffer_remaining_span(JitterBuffer *jitter, spx_uint32_t rem); 179 180 /** Used like the ioctl function to control the jitter buffer parameters 181 * 182 * @param jitter Jitter buffer state 183 * @param request ioctl-type request (one of the JITTER_BUFFER_* macros) 184 * @param ptr Data exchanged to-from function 185 * @return 0 if no error, -1 if request in unknown 186 */ 187 int jitter_buffer_ctl(JitterBuffer *jitter, int request, void *ptr); 188 189 int jitter_buffer_update_delay(JitterBuffer *jitter, JitterBufferPacket *packet, spx_int32_t *start_offset); 190 191 /* @} */ 192 193 #ifdef __cplusplus 194 } 195 #endif 196 197 #endif 198
