Split rtp.h in rtp.h, rtpdec.h, and rtpenc.h

Originally committed as revision 17016 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 187 insertions, 0 deletions

diff --git a/libavformat/rtpdec.h b/libavformat/rtpdec.h
new file mode 100644
index 0000000000..1eeb0ba968
--- /dev/null
+++ b/libavformat/rtpdec.h
@@ -0,0 +1,187 @@
+/*
+ * RTP demuxer definitions
+ * Copyright (c) 2002 Fabrice Bellard
+ * Copyright (c) 2006 Ryan Martell <rdm4@martellventures.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef AVFORMAT_RTPDEC_H
+#define AVFORMAT_RTPDEC_H
+
+#include "libavcodec/avcodec.h"
+#include "avformat.h"
+#include "rtp.h"
+
+/** Structure listing useful vars to parse RTP packet payload*/
+typedef struct rtp_payload_data
+{
+    int sizelength;
+    int indexlength;
+    int indexdeltalength;
+    int profile_level_id;
+    int streamtype;
+    int objecttype;
+    char *mode;
+
+    /** mpeg 4 AU headers */
+    struct AUHeaders {
+        int size;
+        int index;
+        int cts_flag;
+        int cts;
+        int dts_flag;
+        int dts;
+        int rap_flag;
+        int streamstate;
+    } *au_headers;
+    int nb_au_headers;
+    int au_headers_length_bytes;
+    int cur_au_index;
+} RTPPayloadData;
+
+typedef struct PayloadContext PayloadContext;
+typedef struct RTPDynamicProtocolHandler_s RTPDynamicProtocolHandler;
+
+#define RTP_MIN_PACKET_LENGTH 12
+
+int rtp_get_codec_info(AVCodecContext *codec, int payload_type);
+
+typedef struct RTPDemuxContext RTPDemuxContext;
+RTPDemuxContext *rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *rtpc, int payload_type, RTPPayloadData *rtp_payload_data);
+void rtp_parse_set_dynamic_protocol(RTPDemuxContext *s, PayloadContext *ctx,
+                                    RTPDynamicProtocolHandler *handler);
+int rtp_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
+                     const uint8_t *buf, int len);
+void rtp_parse_close(RTPDemuxContext *s);
+
+int rtp_get_local_port(URLContext *h);
+int rtp_set_remote_url(URLContext *h, const char *uri);
+void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd);
+
+/**
+ * some rtp servers assume client is dead if they don't hear from them...
+ * so we send a Receiver Report to the provided ByteIO context
+ * (we don't have access to the rtcp handle from here)
+ */
+int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count);
+
+// these statistics are used for rtcp receiver reports...
+typedef struct {
+    uint16_t max_seq;           ///< highest sequence number seen
+    uint32_t cycles;            ///< shifted count of sequence number cycles
+    uint32_t base_seq;          ///< base sequence number
+    uint32_t bad_seq;           ///< last bad sequence number + 1
+    int probation;              ///< sequence packets till source is valid
+    int received;               ///< packets received
+    int expected_prior;         ///< packets expected in last interval
+    int received_prior;         ///< packets received in last interval
+    uint32_t transit;           ///< relative transit time for previous packet
+    uint32_t jitter;            ///< estimated jitter.
+} RTPStatistics;
+
+/**
+ * Packet parsing for "private" payloads in the RTP specs.
+ *
+ * @param ctx RTSP demuxer context
+ * @param s stream context
+ * @param st stream that this packet belongs to
+ * @param pkt packet in which to write the parsed data
+ * @param timestamp pointer in which to write the timestamp of this RTP packet
+ * @param buf pointer to raw RTP packet data
+ * @param len length of buf
+ * @param flags flags from the RTP packet header (PKT_FLAG_*)
+ */
+typedef int (*DynamicPayloadPacketHandlerProc) (AVFormatContext *ctx,
+                                                PayloadContext *s,
+                                                AVStream *st,
+                                                AVPacket * pkt,
+                                                uint32_t *timestamp,
+                                                const uint8_t * buf,
+                                                int len, int flags);
+
+struct RTPDynamicProtocolHandler_s {
+    // fields from AVRtpDynamicPayloadType_s
+    const char enc_name[50];    /* XXX: still why 50 ? ;-) */
+    enum CodecType codec_type;
+    enum CodecID codec_id;
+
+    // may be null
+    int (*parse_sdp_a_line) (AVFormatContext *s,
+                             int st_index,
+                             PayloadContext *priv_data,
+                             const char *line); ///< Parse the a= line from the sdp field
+    PayloadContext *(*open) (); ///< allocate any data needed by the rtp parsing for this dynamic data.
+    void (*close)(PayloadContext *protocol_data); ///< free any data needed by the rtp parsing for this dynamic data.
+    DynamicPayloadPacketHandlerProc parse_packet; ///< parse handler for this dynamic packet.
+
+    struct RTPDynamicProtocolHandler_s *next;
+};
+
+// moved out of rtp.c, because the h264 decoder needs to know about this structure..
+struct RTPDemuxContext {
+    AVFormatContext *ic;
+    AVStream *st;
+    int payload_type;
+    uint32_t ssrc;
+    uint16_t seq;
+    uint32_t timestamp;
+    uint32_t base_timestamp;
+    uint32_t cur_timestamp;
+    int max_payload_size;
+    struct MpegTSContext *ts;   /* only used for MP2T payloads */
+    int read_buf_index;
+    int read_buf_size;
+    /* used to send back RTCP RR */
+    URLContext *rtp_ctx;
+    char hostname[256];
+
+    RTPStatistics statistics; ///< Statistics for this stream (used by RTCP receiver reports)
+
+    /* rtcp sender statistics receive */
+    int64_t last_rtcp_ntp_time;    // TODO: move into statistics
+    int64_t first_rtcp_ntp_time;   // TODO: move into statistics
+    uint32_t last_rtcp_timestamp;  // TODO: move into statistics
+
+    /* rtcp sender statistics */
+    unsigned int packet_count;     // TODO: move into statistics (outgoing)
+    unsigned int octet_count;      // TODO: move into statistics (outgoing)
+    unsigned int last_octet_count; // TODO: move into statistics (outgoing)
+    int first_packet;
+    /* buffer for output */
+    uint8_t buf[RTP_MAX_PACKET_LENGTH];
+    uint8_t *buf_ptr;
+
+    /* special infos for au headers parsing */
+    RTPPayloadData *rtp_payload_data; // TODO: Move into dynamic payload handlers
+
+    /* dynamic payload stuff */
+    DynamicPayloadPacketHandlerProc parse_packet;     ///< This is also copied from the dynamic protocol handler structure
+    PayloadContext *dynamic_protocol_context;        ///< This is a copy from the values setup from the sdp parsing, in rtsp.c don't free me.
+    int max_frames_per_packet;
+};
+
+extern RTPDynamicProtocolHandler *RTPFirstDynamicPayloadHandler;
+void ff_register_dynamic_payload_handler(RTPDynamicProtocolHandler *handler);
+
+int rtsp_next_attr_and_value(const char **p, char *attr, int attr_size, char *value, int value_size); ///< from rtsp.c, but used by rtp dynamic protocol handlers.
+
+const char *ff_rtp_enc_name(int payload_type);
+enum CodecID ff_rtp_codec_id(const char *buf, enum CodecType codec_type);
+
+void av_register_rtp_dynamic_payload_handlers(void);
+
+#endif /* AVFORMAT_RTPDEC_H */