1/* 2 * "Real" compatible muxer and demuxer. 3 * Copyright (c) 2000, 2001 Fabrice Bellard 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVFORMAT_RM_H 23#define AVFORMAT_RM_H 24 25#include "avformat.h" 26 27extern const char * const ff_rm_metadata[4]; 28extern const unsigned char ff_sipr_subpk_size[4]; 29 30typedef struct RMStream RMStream; 31 32RMStream *ff_rm_alloc_rmstream (void); 33void ff_rm_free_rmstream (RMStream *rms); 34 35/*< input format for Realmedia-style RTSP streams */ 36extern AVInputFormat rdt_demuxer; 37 38/** 39 * Read the MDPR chunk, which contains stream-specific codec initialization 40 * parameters. 41 * 42 * @param s context containing RMContext and ByteIOContext for stream reading 43 * @param pb context to read the data from 44 * @param st the stream that the MDPR chunk belongs to and where to store the 45 * parameters read from the chunk into 46 * @param rst real-specific stream information 47 * @param codec_data_size size of the MDPR chunk 48 * @return 0 on success, errno codes on error 49 */ 50int ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb, 51 AVStream *st, RMStream *rst, 52 int codec_data_size); 53 54/** 55 * Parse one rm-stream packet from the input bytestream. 56 * 57 * @param s context containing RMContext and ByteIOContext for stream reading 58 * @param pb context to read the data from 59 * @param st stream to which the packet to be read belongs 60 * @param rst Real-specific stream information 61 * @param len packet length to read from the input 62 * @param pkt packet location to store the parsed packet data 63 * @param seq pointer to an integer containing the sequence number, may be 64 * updated 65 * @param flags the packet flags 66 * @param ts timestamp of the current packet 67 * @return <0 on error, 0 if a packet was placed in the pkt pointer. A 68 * value >0 means that no data was placed in pkt, but that cached 69 * data is available by calling ff_rm_retrieve_cache(). 70 */ 71int ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb, 72 AVStream *st, RMStream *rst, int len, 73 AVPacket *pkt, int *seq, int flags, int64_t ts); 74 75/** 76 * Retrieve one cached packet from the rm-context. The real container can 77 * store several packets (as interpreted by the codec) in a single container 78 * packet, which means the demuxer holds some back when the first container 79 * packet is parsed and returned. The result is that rm->audio_pkt_cnt is 80 * a positive number, the amount of cached packets. Using this function, each 81 * of those packets can be retrieved sequentially. 82 * 83 * @param s context containing RMContext and ByteIOContext for stream reading 84 * @param pb context to read the data from 85 * @param st stream that this packet belongs to 86 * @param rst Real-specific stream information 87 * @param pkt location to store the packet data 88 * @return the number of samples left for subsequent calls to this same 89 * function, or 0 if all samples have been retrieved. 90 */ 91int ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb, 92 AVStream *st, RMStream *rst, AVPacket *pkt); 93 94/** 95 * Perform 4-bit block reordering for SIPR data. 96 * 97 * @param buf SIPR data 98 */ 99void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize); 100 101#endif /* AVFORMAT_RM_H */ 102