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Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
88 lines
4.2 KiB
C
88 lines
4.2 KiB
C
/*
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* RTP depacketizer declarations
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* Copyright (c) 2010 Martin Storsjo
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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_RTPDEC_FORMATS_H
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#define AVFORMAT_RTPDEC_FORMATS_H
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#include "rtpdec.h"
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/**
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* Parse a Windows Media Server-specific SDP line
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*
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* @param s RTSP demux context
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*/
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int ff_wms_parse_sdp_a_line(AVFormatContext *s, const char *p);
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int ff_h263_handle_packet(AVFormatContext *ctx, PayloadContext *data,
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AVStream *st, AVPacket *pkt, uint32_t *timestamp,
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const uint8_t *buf, int len, uint16_t seq, int flags);
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int ff_h264_parse_sprop_parameter_sets(AVFormatContext *s,
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uint8_t **data_ptr, int *size_ptr,
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const char *value);
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int ff_h264_handle_aggregated_packet(AVFormatContext *ctx, AVPacket *pkt,
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const uint8_t *buf, int len,
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int start_skip, int *nal_counters,
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int nal_mask);
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int ff_h264_handle_frag_packet(AVPacket *pkt, const uint8_t *buf, int len,
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int start_bit, const uint8_t *nal_header,
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int nal_header_len);
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void ff_h264_parse_framesize(AVCodecParameters *par, const char *p);
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extern RTPDynamicProtocolHandler ff_ac3_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_amr_nb_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_amr_wb_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_dv_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_g726_16_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_g726_24_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_g726_32_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_g726_40_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_h261_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_h263_1998_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_h263_2000_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_h263_rfc2190_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_h264_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_hevc_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_ilbc_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_jpeg_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_mp4a_latm_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_mpeg_audio_robust_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_mpegts_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_ms_rtp_asf_pfa_handler;
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extern RTPDynamicProtocolHandler ff_ms_rtp_asf_pfv_handler;
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extern RTPDynamicProtocolHandler ff_qcelp_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_qdm2_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_qt_rtp_aud_handler;
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extern RTPDynamicProtocolHandler ff_qt_rtp_vid_handler;
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extern RTPDynamicProtocolHandler ff_quicktime_rtp_aud_handler;
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extern RTPDynamicProtocolHandler ff_quicktime_rtp_vid_handler;
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extern RTPDynamicProtocolHandler ff_svq3_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_theora_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_vorbis_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_vp8_dynamic_handler;
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extern RTPDynamicProtocolHandler ff_vp9_dynamic_handler;
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#endif /* AVFORMAT_RTPDEC_FORMATS_H */
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