165 lines
5 KiB
C
165 lines
5 KiB
C
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/* $Id$ */
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/*
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* Copyright (C) 2011 Teluu Inc. (http://www.teluu.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __PJMEDIA_H264_PACKETIZER_H__
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#define __PJMEDIA_H264_PACKETIZER_H__
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/**
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* @file h264_packetizer.h
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* @brief Packetizes H.264 bitstream into RTP payload and vice versa.
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*/
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#include <pj/types.h>
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PJ_BEGIN_DECL
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/**
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* Opaque declaration for H.264 packetizer.
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*/
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typedef struct pjmedia_h264_packetizer pjmedia_h264_packetizer;
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/**
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* Enumeration of H.264 packetization modes.
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*/
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typedef enum
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{
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/**
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* Single NAL unit packetization mode will only generate payloads
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* containing a complete single NAL unit packet. As H.264 NAL unit
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* size can be very large, this mode is usually not applicable for
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* network environments with MTU size limitation.
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*/
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PJMEDIA_H264_PACKETIZER_MODE_SINGLE_NAL,
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/**
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* Non-interleaved packetization mode will generate payloads with the
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* following possible formats:
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* - single NAL unit packets,
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* - NAL units aggregation STAP-A packets,
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* - fragmented NAL unit FU-A packets.
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*/
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PJMEDIA_H264_PACKETIZER_MODE_NON_INTERLEAVED,
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/**
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* Interleaved packetization mode will generate payloads with the
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* following possible formats:
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* - single NAL unit packets,
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* - NAL units aggregation STAP-A & STAP-B packets,
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* - fragmented NAL unit FU-A & FU-B packets.
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* This packetization mode is currently unsupported.
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*/
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PJMEDIA_H264_PACKETIZER_MODE_INTERLEAVED,
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} pjmedia_h264_packetizer_mode;
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/**
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* H.264 packetizer setting.
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*/
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typedef struct pjmedia_h264_packetizer_cfg
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{
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/**
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* Maximum payload length.
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* Default: PJMEDIA_MAX_MTU
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*/
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int mtu;
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/**
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* Packetization mode.
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* Default: PJMEDIA_H264_PACKETIZER_MODE_NON_INTERLEAVED
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*/
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pjmedia_h264_packetizer_mode mode;
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/**
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* NAL start code size used for unpacketizing.
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* Valid options are 3 (0, 0, 1) or 4 (0, 0, 0, 1).
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* Default: 3 (0, 0, 1)
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*/
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unsigned unpack_nal_start;
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}
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pjmedia_h264_packetizer_cfg;
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/**
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* Create H.264 packetizer.
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*
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* @param pool The memory pool.
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* @param cfg Packetizer settings, if NULL, default setting
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* will be used.
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* @param p_pktz Pointer to receive the packetizer.
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*
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* @return PJ_SUCCESS on success.
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*/
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PJ_DECL(pj_status_t) pjmedia_h264_packetizer_create(
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pj_pool_t *pool,
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const pjmedia_h264_packetizer_cfg *cfg,
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pjmedia_h264_packetizer **p_pktz);
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/**
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* Generate an RTP payload from a H.264 picture bitstream. Note that this
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* function will apply in-place processing, so the bitstream may be modified
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* during the packetization.
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*
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* @param pktz The packetizer.
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* @param bits The picture bitstream to be packetized.
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* @param bits_len The length of the bitstream.
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* @param bits_pos The bitstream offset to be packetized.
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* @param payload The output payload.
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* @param payload_len The output payload length.
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*
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* @return PJ_SUCCESS on success.
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*/
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PJ_DECL(pj_status_t) pjmedia_h264_packetize(pjmedia_h264_packetizer *pktz,
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pj_uint8_t *bits,
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pj_size_t bits_len,
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unsigned *bits_pos,
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const pj_uint8_t **payload,
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pj_size_t *payload_len);
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/**
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* Append an RTP payload to an H.264 picture bitstream. Note that in case of
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* noticing packet lost, application should keep calling this function with
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* payload pointer set to NULL, as the packetizer need to update its internal
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* state.
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*
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* @param pktz The packetizer.
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* @param payload The payload to be unpacketized.
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* @param payload_len The payload length.
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* @param bits The bitstream buffer.
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* @param bits_size The bitstream buffer size.
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* @param bits_pos The bitstream offset to put the unpacketized payload
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* in the bitstream, upon return, this will be updated
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* to the latest offset as a result of the unpacketized
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* payload.
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*
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* @return PJ_SUCCESS on success.
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*/
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PJ_DECL(pj_status_t) pjmedia_h264_unpacketize(pjmedia_h264_packetizer *pktz,
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const pj_uint8_t *payload,
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pj_size_t payload_len,
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pj_uint8_t *bits,
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pj_size_t bits_len,
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unsigned *bits_pos);
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PJ_END_DECL
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#endif /* __PJMEDIA_H264_PACKETIZER_H__ */
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