About Decode WebM frame

[AA]

Hi All,

My application running on Android 4.0 and it will be getting WebM
Decoded data from Windows , linux and may be from Mac,

but of different frame size, like 320X240, 640X480 , 1280X960 etc....

due to performance reason, i would like to decode at smaller frame
size i.e. 320X240, i.e. whatever be the bitstream, but let me get the
image / frame of size 320X240,

Is there any way to achieve it, i tried following way,

vpx_codec_dec_cfg_t
cfg;
memset(&cfg,
0x00,sizeof(vpx_codec_dec_cfg_t));

cfg.threads = 1;
cfg.w = 320;
cfg.h = 240;

if ( vpx_codec_dec_init( &webmCodec, &vpx_codec_vp8_dx_algo,
&cfg, 0 ) ) {

handleWebMError(&webmCodec);
}

this doesn't give any error, but


if ( vpx_codec_decode( webmCodec, (const uint8_t*)imgBits,
codedSize, NULL,0)){

handleWebMError(&webmCodec);
}
vpx_codec_iter_t iter = 0;
vpx_image_t *img;

img =
vpx_codec_get_frame( pWebCTX, &iter );
if client is sending video of size 640X480, in the img->d_w is coming
out to be 640 , and img_d_h is coming out to be 480, is there any way
to control them.

BTW if i can get frame of required size, will it improve the
performance ?

Thanks in advance....

[Attila Nagy]

Hi,

You always decode at the encoded resolution, no way to avoid that. 

Once decoded you can downscale the video but that will not help if you have performance problems.

-Atti

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