Sample app: vp9_spatial_scalable_encoder
vpx_codec_control extensions:
VP9E_SET_SVC
VP9E_SET_WIDTH, VP9E_SET_HEIGHT, VP9E_SET_LAYER
VP9E_SET_MIN_Q, VP9E_SET_MAX_Q
expanded buffer size for vp9_convolve
modified setting of initial width in vp9_onyx_if.c so that layer size
can be set prior to initial encode
Default number of layers set to 3 (VPX_SS_DEFAULT_LAYERS)
Number of layers set explicitly in vpx_codec_enc_cfg.ss_number_layers
Change-Id: I2c7a6fe6d665113671337032f7ad032430ac4197
Ivan Maltz