Architecture and Data Flow

nvm_iep Stack Diagram


Name	Description
nvm_iep_sci	The sample application which calls the NvMedia IEP APIs. On receipt of the headers and bitstream, packetizes the encoded stream and saves the result to an output file.
NvMedia IEP API	Calls the low-level hardware driver interface to issue encoding commands to NVENC microcode.
Low-level hardware driver	Writes out high level headers, including SPS, PPS, VUI and SEI. The driver creates and maintains reference picture surfaces, the output bitstream buffers, and the internal status buffers. For each input picture, the driver provides a configuration data structure (a picture setup) that contains encoder parameters along with the encode commands to the NVENC microcode. This structure contains: Buffer information (current picture, reference pictures) Sequence and picture parameter set information and rate control configuration Other module configurations as needed
NVENC microcode	Accesses the hardware engine to schedule the encoding commands, and return the encode status including bitstreams, statistics, etc.
NVENC hardware engine	Handles slice header and data.

Picture buffers must be in block linear format. Pitch linear input data is not supported due to inefficiency in the memory accesses.

The picture dimensions of the encoded streams are always in multiples of 4 pixels.