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c4584f3c1f
According to newer RFCs, this packetization scheme should only be used for interfacing with legacy systems. Implementing this packetization mode properly requires parsing the full H263 bitstream to find macroblock boundaries (and knowing their macroblock and gob numbers and motion vector predictors). This implementation tries to look for GOB headers (which can be inserted by using -ps <small number>), but if the GOBs aren't small enough to fit into the MTU, the packetizer blindly splits packets at any offset and claims it to be a GOB boundary (by using Mode A from the RFC). While not correct, this seems to work with some receivers. Signed-off-by: Martin Storsjö <martin@martin.st>
90 lines
3.5 KiB
C
90 lines
3.5 KiB
C
/*
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* RTP muxer definitions
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_RTPENC_H
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#define AVFORMAT_RTPENC_H
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#include "avformat.h"
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#include "rtp.h"
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struct RTPMuxContext {
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const AVClass *av_class;
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AVFormatContext *ic;
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AVStream *st;
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int payload_type;
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uint32_t ssrc;
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uint16_t seq;
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uint32_t timestamp;
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uint32_t base_timestamp;
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uint32_t cur_timestamp;
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int max_payload_size;
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int num_frames;
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/* rtcp sender statistics receive */
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int64_t last_rtcp_ntp_time; // TODO: move into statistics
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int64_t first_rtcp_ntp_time; // TODO: move into statistics
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/* rtcp sender statistics */
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unsigned int packet_count; // TODO: move into statistics (outgoing)
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unsigned int octet_count; // TODO: move into statistics (outgoing)
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unsigned int last_octet_count; // TODO: move into statistics (outgoing)
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int first_packet;
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/* buffer for output */
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uint8_t *buf;
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uint8_t *buf_ptr;
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int max_frames_per_packet;
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/**
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* Number of bytes used for H.264 NAL length, if the MP4 syntax is used
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* (1, 2 or 4)
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*/
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int nal_length_size;
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int flags;
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};
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typedef struct RTPMuxContext RTPMuxContext;
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#define FF_RTP_FLAG_MP4A_LATM 1
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#define FF_RTP_FLAG_RFC2190 2
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#define FF_RTP_FLAG_OPTS(ctx, fieldname) \
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{ "rtpflags", "RTP muxer flags", offsetof(ctx, fieldname), AV_OPT_TYPE_FLAGS, {.dbl = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "rtpflags" }, \
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{ "latm", "Use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC", 0, AV_OPT_TYPE_CONST, {.dbl = FF_RTP_FLAG_MP4A_LATM}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "rtpflags" }, \
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{ "rfc2190", "Use RFC 2190 packetization instead of RFC 4629 for H.263", 0, AV_OPT_TYPE_CONST, {.dbl = FF_RTP_FLAG_RFC2190}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "rtpflags" }, \
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void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m);
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void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size);
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void ff_rtp_send_h263(AVFormatContext *s1, const uint8_t *buf1, int size);
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void ff_rtp_send_h263_rfc2190(AVFormatContext *s1, const uint8_t *buf1, int size);
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void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size);
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void ff_rtp_send_latm(AVFormatContext *s1, const uint8_t *buff, int size);
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void ff_rtp_send_amr(AVFormatContext *s1, const uint8_t *buff, int size);
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void ff_rtp_send_mpegvideo(AVFormatContext *s1, const uint8_t *buf1, int size);
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void ff_rtp_send_xiph(AVFormatContext *s1, const uint8_t *buff, int size);
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void ff_rtp_send_vp8(AVFormatContext *s1, const uint8_t *buff, int size);
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const uint8_t *ff_h263_find_resync_marker_reverse(const uint8_t *restrict start,
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const uint8_t *restrict end);
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#endif /* AVFORMAT_RTPENC_H */
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