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 #include "internal.h" 27 28 extern const char * const ff_rm_metadata[4]; 29 extern const AVCodecTag ff_rm_codec_tags[]; 30 31 typedef struct RMStream RMStream; 32 33 RMStream *ff_rm_alloc_rmstream (void); 34 void ff_rm_free_rmstream (RMStream *rms); 35 36 /*< input format for Realmedia-style RTSP streams */ 37 extern AVInputFormat ff_rdt_demuxer; 38 39 /** 40 * Read the MDPR chunk, which contains stream-specific codec initialization 41 * parameters. 42 * 43 * @param s context containing RMContext and AVIOContext for stream reading 44 * @param pb context to read the data from 45 * @param st the stream that the MDPR chunk belongs to and where to store the 46 * parameters read from the chunk into 47 * @param rst real-specific stream information 48 * @param codec_data_size size of the MDPR chunk 49 * @return 0 on success, errno codes on error 50 */ 51 int ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb, 52 AVStream *st, RMStream *rst, 53 unsigned int codec_data_size, const uint8_t *mime); 54 55 /** 56 * Parse one rm-stream packet from the input bytestream. 57 * 58 * @param s context containing RMContext and AVIOContext for stream reading 59 * @param pb context to read the data from 60 * @param st stream to which the packet to be read belongs 61 * @param rst Real-specific stream information 62 * @param len packet length to read from the input 63 * @param pkt packet location to store the parsed packet data 64 * @param seq pointer to an integer containing the sequence number, may be 65 * updated 66 * @param flags the packet flags 67 * @param ts timestamp of the current packet 68 * @return <0 on error, 0 if a packet was placed in the pkt pointer. A 69 * value >0 means that no data was placed in pkt, but that cached 70 * data is available by calling ff_rm_retrieve_cache(). 71 */ 72 int ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb, 73 AVStream *st, RMStream *rst, int len, 74 AVPacket *pkt, int *seq, int flags, int64_t ts); 75 76 /** 77 * Retrieve one cached packet from the rm-context. The real container can 78 * store several packets (as interpreted by the codec) in a single container 79 * packet, which means the demuxer holds some back when the first container 80 * packet is parsed and returned. The result is that rm->audio_pkt_cnt is 81 * a positive number, the amount of cached packets. Using this function, each 82 * of those packets can be retrieved sequentially. 83 * 84 * @param s context containing RMContext and AVIOContext for stream reading 85 * @param pb context to read the data from 86 * @param st stream that this packet belongs to 87 * @param rst Real-specific stream information 88 * @param pkt location to store the packet data 89 * @return the number of samples left for subsequent calls to this same 90 * function, or 0 if all samples have been retrieved. 91 */ 92 int ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb, 93 AVStream *st, RMStream *rst, AVPacket *pkt); 94 95 #endif /* AVFORMAT_RM_H */ 96