OBS(27版本)中音视频数据流向总结_obs27版本资源-CSDN文库

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media

source

video capture thread

window

source

async_frames

list

obs_graphics_thread

async input source ?

Tick

cur_async_frame

GPU convert

async_textures

async_texrender

render source

prepare canvas

Tick

render source

output canvas

using raw

encode ?

GPU convert

Save YUV

convert_textures output_texture

video_output::cache

using gpu

encode ?

gpu-encoder-queue

Copy texture

Save texture

render_texture

video_thread gpu_encode_thread

wait signal

read texture

wait signal

read raw frame

video_output::inputs

• start_raw_video

• stop_raw_video

receive_video

callback

...

default_raw_video_callback do_encode

encoder module

•

libx264/5

•

media fundation

H.264

•

QSV

•

AMF

•

NVENC

•

libfdk-aac

•

ffmpeg-aac

•

mediafundation aac

send_off_encoder_pac

ket

interleaved_packets

avavavav

encoder->callbacks • obs_encoder_start_internal

• obs_encoder_stop_internal

interleave_packets

callback

... ...

• encode_texture ( for gpu encode )

• encode ( for raw a/v )

audio_thread

read front packet

output::encoded_packet

tick audio for sources

obs_source_audio_render

mixer root channel source

audio_mix ：： inputs

• audio_output_connect

• audio_output_disconnect

receive_audio

callback

... ...

for

gpu_encoders

• start_gpu_encode

• stop_gpu_encode

obs_view_t::channels

[MAX_CHANNELS ]

• scene transition source

• mic audio source

• desktop audio source

• ....

• scene transition source

• scene source

• all audio source

audio_output_buf

1024 frames

audio_input_buf

circle buffer

audio_output::mixes

[track_count]

plugin::tick

plugin::render

plugin::mixer_audio

called

get_closest_frame

obs_source_output_video

push audio

obs_source_output_audio

resample audio

apply audio filter

storage audio

source->audio_cb_list

called

• obs_source_add_audio_capture_callback

• obs_source_remove_audio_capture_callback

audio monitor

cb

...

volumn mete calc

cb

source

audio capture thread

obs_source_update_async_video

yes

no

yes

yes

no

update-semaphore

gpu-encode-semaphore

texture encode

普通硬编码（video_thread）

GPU -> CPU 【libobs】 --> 【encode module】 CPU -> GPU -> encode

纹理硬编码（gpu_encode_thread）

GPU 【libobs --> 【encode module】 GPU -> encode

record output

保证音视频时间戳单调递增

render

start from

channel source

obs_view_t::channels

[MAX_CHANNELS ]

ffmpeg mux.exelibRTMP

IPC (pipe)

stream output

check convert video (width/height/format)

output::raw_video

vcam output

Process of XXX.exe

Another process that added

"PRISM Camera"

prism-virtualcam-module64.dll

IPC (memory map)

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