PnaCL _ development of video media player plugin in chrome

[George varghese]

Hi,

I am trying to develop a media player in chrome. I listed here my requirement,

1. Play video file from html. Is it a file or live data 

2. I want to play/pause/stop from html.

For this need any permission for video play in chrome navigator, is required?

For this purpose , I passed the objecturl to the nativemodule, remaining things Idon't know, which function of MediaStreamVideoTrack,I called for play it?

so please guide me for fulfill my requirement..

I am waiting for your reply.

Regards,

George

[George varghese]

Hi,

Can anybody answer to my question. I am waiting for your reply.

Regards,

George

[Victor Khimenko]

On Mon, Feb 22, 2016 at 4:43 AM, George varghese <geor...@gmail.com> wrote:

Hi,

Can anybody answer to my question. I am waiting for your reply.

I don't think anybody would do that because you question is kinda "How To Draw an Owl" meme ( http://knowyourmeme.com/memes/how-to-draw-an-owl ) in reverse. I know how to draw an oval or two - how do a draw an owl? Such questions is unlikely to be answered.

Could you write a video player in pNaCl? Sure - but that involves a lot of steps and pieces.

Could you use existing Chrome video player for your needs? Not if you want to use pNaCl (there are no interface to do that) - but there are low-level PPAPI interfaces (and it's easy to find them in Google: for example here - https://chromium.googlesource.com/chromium/src/+/master/ppapi/examples/media_stream_video ).

It's highly unlikely that anyone would write LOC program and/or article of 100'000 words which would answer you questions - but if you ask smaller, more focused questions - then it's possible.

[George varghese]

Thank you for your reply. 

Have any other third party video player for pnacl?, please suggest any?

Regards,

George

[George varghese]

Hi All,

Have any existing chrome video player for do this?. if have, should support the rtsp..

if anybody know about it? please help me.

Regards,

George

[George varghese]

Hi All,

For the development of media player plugin, I have been selected the below items,

1. SDL for the media player playback

2. ffmpeg for rtsp video streaming.

I downloaded the sdl2 library for compatible of pnacl toolchain. I integrated into my app,

I am getting the below error,

Please note the pepper version is 47.

Please see the make file,

DEPS = ppapi_simple_cpp nacl_io
LIBS = SDL2_test SDL2 ppapi_simple SDL2main SDL2 $(DEPS) ppapi_gles2 ppapi_cpp ppapi pthread nacl_io
CFLAGS := -Wall -I$(NACL_SDK_ROOT)/SDL/include/SDL2
SOURCES = sdlgkmediastreamvideo.cc
PNACL_LDFLAGS += -L$(NACL_SDK_ROOT)/SDL/lib -Wl,-uPSUserMainGet

After that I got the below error,

C:\nacl_sdk\pepper_47\toolchain\win_pnacl\bin\le32-nacl-ld.gold.exe: error: C:/nacl_sdk/pepper_47/lib/pnacl/Release/libppapi_simple_cpp.a: multiple definition of 'pp::CreateModule()'
C:\nacl_sdk\pepper_47\toolchain\win_pnacl\bin\le32-nacl-ld.gold.exe: pnacl/Release/sdlgkmediastreamvideo.o: previous definition here
C:/nacl_sdk/pepper_47/lib/pnacl/Release/libppapi_simple.a: error: undefined reference to 'PSUserMainGet'
Makefile:150: recipe for target 'pnacl/Release/GKNewMediaPluginSDL_unstripped.bc' failed
make: *** [pnacl/Release/GKNewMediaPluginSDL_unstripped.bc] Error 1

Then I commented below code in my c file,

namespace pp {

Module* CreateModule() {

  return new GKMediaStreamModule();

}

} 

Again building , I got the below error,

make[1]: Leaving directory 'C:/nacl_sdk/pepper_47/src/nacl_io'
  LINK pnacl/Release/GKNewMediaPluginSDL_unstripped.bc 
C:/nacl_sdk/pepper_47/toolchain/win_pnacl/le32-nacl/lib/libppapi_stub.a: error: undefined reference to 'PPP_InitializeModule'
C:/nacl_sdk/pepper_47/toolchain/win_pnacl/le32-nacl/lib/libppapi_stub.a: error: undefined reference to 'PPP_ShutdownModule'
C:/nacl_sdk/pepper_47/toolchain/win_pnacl/le32-nacl/lib/libppapi_stub.a: error: undefined reference to 'PPP_GetInterface'
make: *** [pnacl/Release/GKNewMediaPluginSDL_unstripped.bc] Error 1
Makefile:150: recipe for target 'pnacl/Release/GKNewMediaPluginSDL_unstripped.bc' failed

If anybody is got the same error, please reply

Regards,

George

[George varghese]

Hi All,

When I updated the pepper version 47 to 49, the source code was buildable.

When I loading it to the browser, I getting the below error in console..

PpapiPluginStart: No AT_SYSINFO item found in auxv, so cannot start PPAPI.  Is the IRT library not present?

How can I resolve it?

Regards,

George 

[George varghese]

Hi,

When I updated the pepper version 47 to 49 and integrated the SDL libraries, then compiling , seems that below error,

make[1]: Leaving directory 'C:/nacl_sdk/pepper_49/src/nacl_io'
  LINK pnacl/Release/GKNewMediaPluginSDL_unstripped.bc 
C:\nacl_sdk\pepper_49\toolchain\win_pnacl\bin\le32-nacl-ld.gold.exe: error: C:/nacl_sdk/pepper_49/lib/pnacl/Release/libppapi_cpp.a: multiple definition of 'PPP_InitializeModule'
C:\nacl_sdk\pepper_49\toolchain\win_pnacl\bin\le32-nacl-ld.gold.exe: C:/nacl_sdk/pepper_49/lib/pnacl/Release/libppapi_simple_real.a: previous definition here
C:\nacl_sdk\pepper_49\toolchain\win_pnacl\bin\le32-nacl-ld.gold.exe: error: C:/nacl_sdk/pepper_49/lib/pnacl/Release/libppapi_cpp.a: multiple definition of 'PPP_ShutdownModule'
C:\nacl_sdk\pepper_49\toolchain\win_pnacl\bin\le32-nacl-ld.gold.exe: C:/nacl_sdk/pepper_49/lib/pnacl/Release/libppapi_simple_real.a: previous definition here
C:\nacl_sdk\pepper_49\toolchain\win_pnacl\bin\le32-nacl-ld.gold.exe: error: C:/nacl_sdk/pepper_49/lib/pnacl/Release/libppapi_cpp.a: multiple definition of 'PPP_GetInterface'
C:\nacl_sdk\pepper_49\toolchain\win_pnacl\bin\le32-nacl-ld.gold.exe: C:/nacl_sdk/pepper_49/lib/pnacl/Release/libppapi_simple_real.a: previous definition here
C:\nacl_sdk\pepper_49\toolchain\win_pnacl\bin\le32-nacl-ld.gold.exe: warning: LLVM gold plugin: Linking two modules of different data layouts: 'C:/nacl_sdk/pepper_49/SDL/lib/libSDL2.a' is 'e-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-p:32:32:32-v128:32:32' whereas 'ld-temp.o' is 'e-p:32:32-i64:64-n32'

but pexe is generated into the pnacl release folder. When load to the chrome browser, seems that the below error,

PpapiPluginStart: No AT_SYSINFO item found in auxv, so cannot start PPAPI.  Is the IRT library not present?

If anybody know about this, please reply.

Regards,

George

 

[George varghese]

Hi,

I shall add here more details for understand the issue more clearly,

I build the sdl source code, https://www.libsdl.org/download-2.0.php, 2.0.4

Please see the make file ,

DEPS = ppapi_simple_cpp nacl_io 
LIBS = SDL2_test SDL2 ppapi_simple SDL2main SDL2 $(DEPS) ppapi_gles2 ppapi_cpp ppapi pthread 

CFLAGS = -Wall -I$(NACL_SDK_ROOT)/SDL/include/SDL2
SOURCES = sdlgkmediastreamvideo.cc
PNACL_LDFLAGS += -L$(NACL_SDK_ROOT)/SDL/lib 

define LINKER_RULE
all: $(1).pexe 
$(1)_x86_32.nexe : $(1).bc
$(call LOG,TRANSLATE,$$@,$(PNACL_TRANSLATE) --allow-llvm-bitcode-input -arch x86-32 $$^ -o $$@)
$(1)_x86_64.nexe : $(1).bc
$(call LOG,TRANSLATE,$$@,$(PNACL_TRANSLATE) --allow-llvm-bitcode-input -arch x86-64 $$^ -o $$@)
$(1)_arm.nexe : $(1).bc
$(call LOG,TRANSLATE,$$@,$(PNACL_TRANSLATE) --allow-llvm-bitcode-input -arch arm $$^ -o $$@)
$(1).pexe: $(1).bc
$(call LOG,FINALIZE,$$@,$(PNACL_FINALIZE) -o $$@ $$^)
$(1).bc: $(2) $(foreach dep,$(4),$(STAMPDIR)/$(dep).stamp)
$(call LOG,LINK,$$@,$(PNACL_LINK) -o $$@ $(2) $(PNACL_LDFLAGS) $(foreach path,$(5),-L$(path)/pnacl/$(CONFIG)) -L./lib $(foreach lib,$(3),-l$(lib)) $(6))
endef
$(foreach dep,$(DEPS),$(eval $(call DEPEND_RULE,$(dep))))
$(foreach src,$(SOURCES),$(eval $(call COMPILE_RULE,$(src),$(CFLAGS))))
ifeq ($(CONFIG),Release)
$(eval $(call LINK_RULE,$(TARGET)_unstripped,$(SOURCES),$(LIBS),$(DEPS)))
$(eval $(call STRIP_RULE,$(TARGET),$(TARGET)_unstripped))
else
$(eval $(call LINK_RULE,$(TARGET),$(SOURCES),$(LIBS),$(DEPS)))
endif
$(eval $(call NMF_RULE,$(TARGET),))

Regards,

George

[Aaron Michaux]

I get precisely the same problem. After /finally/ getting SDL and testgles2.c to compile, and figuring out how to serve the pexe with an nmf file, I get:

   PpapiPluginStart: No AT_SYSINFO item found in auxv, so cannot start PPAPI.  Is the IRT library not present?

From what I understand, it is because the SDL container isn't set up correctly: there's some security feature that is preventing it from running. Gleaned that from here: http://permalink.gmane.org/gmane.comp.security.nativeclient.general/4178

Would dearly love to know how to correctly serve an SDL application in pNaCl.