mirror of https://github.com/ossrs/srs.git
detect the video/audio codec, only cache the h264/aac sequence header
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/*
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The MIT License (MIT)
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Copyright (c) 2013 winlin
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <srs_core_codec.hpp>
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SrsCodec::SrsCodec()
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{
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}
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SrsCodec::~SrsCodec()
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{
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}
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bool SrsCodec::video_is_sequence_header(int8_t* data, int size)
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{
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// E.4.3.1 VIDEODATA
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// Frame Type UB [4]
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// Type of video frame. The following values are defined:
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// 1 = key frame (for AVC, a seekable frame)
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// 2 = inter frame (for AVC, a non-seekable frame)
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// 3 = disposable inter frame (H.263 only)
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// 4 = generated key frame (reserved for server use only)
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// 5 = video info/command frame
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//
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// AVCPacketType IF CodecID == 7 UI8
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// The following values are defined:
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// 0 = AVC sequence header
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// 1 = AVC NALU
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// 2 = AVC end of sequence (lower level NALU sequence ender is
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// not required or supported)
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// sequence header only for h264
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if (!video_is_h264(data, size)) {
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return false;
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}
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// 2bytes required.
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if (size < 2) {
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return false;
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}
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char frame_type = *(char*)data;
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frame_type = (frame_type >> 4) & 0x0F;
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char avc_packet_type = *(char*)(data + 1);
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return frame_type == 1 && avc_packet_type == 0;
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}
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bool SrsCodec::audio_is_sequence_header(int8_t* data, int size)
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{
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// AACPacketType IF SoundFormat == 10 UI8
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// The following values are defined:
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// 0 = AAC sequence header
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// 1 = AAC raw
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// sequence header only for aac
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if (!audio_is_aac(data, size)) {
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return false;
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}
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// 2bytes required.
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if (size < 2) {
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return false;
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}
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char aac_packet_type = *(char*)(data + 1);
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return aac_packet_type == 0;
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}
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bool SrsCodec::video_is_h264(int8_t* data, int size)
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{
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// E.4.3.1 VIDEODATA
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// CodecID UB [4]
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// Codec Identifier. The following values are defined:
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// 2 = Sorenson H.263
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// 3 = Screen video
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// 4 = On2 VP6
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// 5 = On2 VP6 with alpha channel
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// 6 = Screen video version 2
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// 7 = AVC
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// 1bytes required.
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if (size < 1) {
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return false;
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}
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char codec_id = *(char*)data;
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codec_id = codec_id & 0x0F;
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return codec_id == 7;
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}
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bool SrsCodec::audio_is_aac(int8_t* data, int size)
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{
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// SoundFormat UB [4]
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// Format of SoundData. The following values are defined:
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// 0 = Linear PCM, platform endian
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// 1 = ADPCM
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// 2 = MP3
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// 3 = Linear PCM, little endian
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// 4 = Nellymoser 16 kHz mono
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// 5 = Nellymoser 8 kHz mono
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// 6 = Nellymoser
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// 7 = G.711 A-law logarithmic PCM
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// 8 = G.711 mu-law logarithmic PCM
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// 9 = reserved
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// 10 = AAC
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// 11 = Speex
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// 14 = MP3 8 kHz
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// 15 = Device-specific sound
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// Formats 7, 8, 14, and 15 are reserved.
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// AAC is supported in Flash Player 9,0,115,0 and higher.
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// Speex is supported in Flash Player 10 and higher.
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// 1bytes required.
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if (size < 1) {
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return false;
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}
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char sound_format = *(char*)data;
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sound_format = (sound_format >> 4) & 0x0F;
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return sound_format == 10;
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}
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@ -0,0 +1,49 @@
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/*
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The MIT License (MIT)
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Copyright (c) 2013 winlin
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
|
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
|
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the Software, and to permit persons to whom the Software is furnished to do so,
|
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subject to the following conditions:
|
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|
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
|
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|
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef SRS_CORE_CODEC_HPP
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#define SRS_CORE_CODEC_HPP
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/*
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#include <srs_core_codec.hpp>
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*/
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#include <srs_core.hpp>
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/**
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* Annex E. The FLV File Format
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*/
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class SrsCodec
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{
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public:
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SrsCodec();
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virtual ~SrsCodec();
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public:
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virtual bool video_is_sequence_header(int8_t* data, int size);
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virtual bool audio_is_sequence_header(int8_t* data, int size);
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private:
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virtual bool video_is_h264(int8_t* data, int size);
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virtual bool audio_is_aac(int8_t* data, int size);
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};
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#endif
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