mirror of
https://github.com/hrydgard/ppsspp.git
synced 2026-11-01 12:07:31 +01:00
Henrik RydgårdandClaude Opus 5.5
d0e3141f43
The ffmpeg submodule held prebuilt libraries for every platform next to the sources (about 1.5 GB checked out), and nothing uses those any more. Only the needed sources are copied in, from the submodule's commit, along with every header and template they include. The path is new, so checking out commits on either side of this works. It's also cut down to what PPSSPP uses: the H.264, AAC, MP3, ATRAC3 and ATRAC3+ decoders, the H.264 parser, the demuxers as before, and the FFV1 encoder, AVI muxer and file protocol for AVI dumping. config.h takes its CONFIG_ values from FFmpeg 3.0.2's own configure run with just those enabled. The raw H.264 demuxer stays even though nothing opens raw H.264: probing PSMF data uses it to identify the video stream's codec, which otherwise comes out as none. On top of that: - The files nothing links (configure would build them, but they're never pulled out of the static library, going by the GCC link map) are left out: mostly libavutil's crypto and hashing and the alternative DCT/IDCT/FFT versions. - libswresample isn't built, now that nothing uses it. - The H.264 decoder only does 8-bit video, which is all the PSP has. The SPS parser rejects any other bit depth, and the DSP files no longer build their 9- to 16-bit variants, which the linker kept because the init functions pick one by bit depth at run time. That's 160 files to compile instead of 277, and 391 of FFmpeg's vendored, about 5.8 MB. The README in ext/ffmpeg has what was done, the PPSSPP patches in the copy, how to add a component, and the tradeoffs. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
116 lines
3.9 KiB
C
116 lines
3.9 KiB
C
/*
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* RTP definitions
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* Copyright (c) 2002 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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_RTP_H
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#define AVFORMAT_RTP_H
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#include "libavformat/avformat.h"
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#include "libavcodec/avcodec.h"
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#include "libavutil/mathematics.h"
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/**
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* Return the payload type for a given stream used in the given format context.
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* Static payload types are derived from the codec.
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* Dynamic payload type are derived from the id field in AVStream.
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* The format context private option payload_type overrides both.
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*
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* @param fmt The context of the format
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* @param codec The context of the codec
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* @param idx The stream index
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* @return The payload type (the 'PT' field in the RTP header).
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*/
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int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec,
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int idx);
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/**
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* Initialize a codec context based on the payload type.
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*
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* Fill the codec_type and codec_id fields of a codec context with
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* information depending on the payload type; for audio codecs, the
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* channels and sample_rate fields are also filled.
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*
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* @param codec The context of the codec
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* @param payload_type The payload type (the 'PT' field in the RTP header)
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* @return In case of unknown payload type or dynamic payload type, a
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* negative value is returned; otherwise, 0 is returned
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*/
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int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type);
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/**
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* Return the encoding name (as defined in
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* http://www.iana.org/assignments/rtp-parameters) for a given payload type.
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*
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* @param payload_type The payload type (the 'PT' field in the RTP header)
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* @return In case of unknown payload type or dynamic payload type, a pointer
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* to an empty string is returned; otherwise, a pointer to a string containing
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* the encoding name is returned
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*/
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const char *ff_rtp_enc_name(int payload_type);
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/**
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* Return the codec id for the given encoding name and codec type.
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*
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* @param buf A pointer to the string containing the encoding name
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* @param codec_type The codec type
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* @return In case of unknown encoding name, AV_CODEC_ID_NONE is returned;
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* otherwise, the codec id is returned
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*/
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enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type);
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#define RTP_PT_PRIVATE 96
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#define RTP_VERSION 2
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#define RTP_MAX_SDES 256 /**< maximum text length for SDES */
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/* RTCP packets use 0.5% of the bandwidth */
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#define RTCP_TX_RATIO_NUM 5
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#define RTCP_TX_RATIO_DEN 1000
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/* An arbitrary id value for RTP Xiph streams - only relevant to indicate
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* that the configuration has changed within a stream (by changing the
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* ident value sent).
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*/
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#define RTP_XIPH_IDENT 0xfecdba
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/* RTCP packet types */
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enum RTCPType {
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RTCP_FIR = 192,
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RTCP_NACK, // 193
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RTCP_SMPTETC,// 194
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RTCP_IJ, // 195
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RTCP_SR = 200,
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RTCP_RR, // 201
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RTCP_SDES, // 202
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RTCP_BYE, // 203
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RTCP_APP, // 204
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RTCP_RTPFB,// 205
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RTCP_PSFB, // 206
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RTCP_XR, // 207
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RTCP_AVB, // 208
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RTCP_RSI, // 209
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RTCP_TOKEN,// 210
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};
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#define RTP_PT_IS_RTCP(x) (((x) >= RTCP_FIR && (x) <= RTCP_IJ) || \
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((x) >= RTCP_SR && (x) <= RTCP_TOKEN))
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#define NTP_TO_RTP_FORMAT(x) av_rescale((x), INT64_C(1) << 32, 1000000)
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#endif /* AVFORMAT_RTP_H */
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