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Files | Data Structures | Macros | Typedefs | Enumerations
WebM VP8/VP9 Encoder
Supported Codecs » VP8

## Files
file | vp8cx.h
| Provides definitions for using VP8 or VP9 encoder algorithm within the vpx Codec Interface.

## Data Structures
struct | vpx_roi_map
| vpx region of interest map More...
struct | vpx_active_map
| vpx active region map More...
struct | vpx_scaling_mode
| vpx image scaling mode More...
struct | vpx_svc_layer_id
| vp9 svc layer parameters More...

## Macros
#define | VP8_EFLAG_NO_REF_LAST (1<<16)
| Don't reference the last frame. More...
#define | VP8_EFLAG_NO_REF_GF (1<<17)
| Don't reference the golden frame. More...
#define | VP8_EFLAG_NO_REF_ARF (1<<21)
| Don't reference the alternate reference frame. More...
#define | VP8_EFLAG_NO_UPD_LAST (1<<18)
| Don't update the last frame. More...
#define | VP8_EFLAG_NO_UPD_GF (1<<22)
| Don't update the golden frame. More...
#define | VP8_EFLAG_NO_UPD_ARF (1<<23)
| Don't update the alternate reference frame. More...
#define | VP8_EFLAG_FORCE_GF (1<<19)
| Force golden frame update. More...
#define | VP8_EFLAG_FORCE_ARF (1<<24)
| Force alternate reference frame update. More...
#define | VP8_EFLAG_NO_UPD_ENTROPY (1<<20)
| Disable entropy update. More...

## Typedefs
typedef enum vpx_scaling_mode_1d | VPX_SCALING_MODE
| vpx 1-D scaling mode More...
typedef struct vpx_roi_map | vpx_roi_map_t
| vpx region of interest map More...
typedef struct vpx_active_map | vpx_active_map_t
| vpx active region map More...
typedef struct vpx_scaling_mode | vpx_scaling_mode_t
| vpx image scaling mode More...
typedef struct vpx_svc_layer_id | vpx_svc_layer_id_t
| vp9 svc layer parameters More...

## Enumerations
enum | vp8e_enc_control_id { VP8E_UPD_ENTROPY = 5, VP8E_UPD_REFERENCE, VP8E_USE_REFERENCE, VP8E_SET_ROI_MAP, VP8E_SET_ACTIVEMAP, VP8E_SET_SCALEMODE = 11, VP8E_SET_CPUUSED = 13, VP8E_SET_ENABLEAUTOALTREF, VP8E_SET_NOISE_SENSITIVITY, VP8E_SET_SHARPNESS, VP8E_SET_STATIC_THRESHOLD, VP8E_SET_TOKEN_PARTITIONS, VP8E_GET_LAST_QUANTIZER, VP8E_GET_LAST_QUANTIZER_64, VP8E_SET_ARNR_MAXFRAMES, VP8E_SET_ARNR_STRENGTH, VP8E_SET_ARNR_TYPE, VP8E_SET_TUNING, VP8E_SET_CQ_LEVEL, VP8E_SET_MAX_INTRA_BITRATE_PCT, VP8E_SET_FRAME_FLAGS, VP9E_SET_MAX_INTER_BITRATE_PCT, VP9E_SET_GF_CBR_BOOST_PCT, VP8E_SET_TEMPORAL_LAYER_ID, VP8E_SET_SCREEN_CONTENT_MODE, VP9E_SET_LOSSLESS, VP9E_SET_TILE_COLUMNS, VP9E_SET_TILE_ROWS, VP9E_SET_FRAME_PARALLEL_DECODING, VP9E_SET_AQ_MODE, VP9E_SET_FRAME_PERIODIC_BOOST, VP9E_SET_NOISE_SENSITIVITY, VP9E_SET_SVC, VP9E_SET_SVC_LAYER_ID, VP9E_SET_TUNE_CONTENT, VP9E_SET_COLOR_SPACE }
| VPx encoder control functions. More...
enum | vpx_scaling_mode_1d { VP8E_NORMAL = 0, VP8E_FOURFIVE = 1, VP8E_THREEFIVE = 2, VP8E_ONETWO = 3 }
| vpx 1-D scaling mode More...
enum | vp8e_token_partitions { VP8_ONE_TOKENPARTITION = 0, VP8_TWO_TOKENPARTITION = 1, VP8_FOUR_TOKENPARTITION = 2, VP8_EIGHT_TOKENPARTITION = 3 }
| VP8 token partition mode. More...
enum | vp9e_tune_content { VP9E_CONTENT_DEFAULT, VP9E_CONTENT_SCREEN, VP9E_CONTENT_INVALID }
enum | vp8e_tuning { VP8_TUNE_PSNR, VP8_TUNE_SSIM }
| VP8 model tuning parameters. More...

## Algorithm interface for VP8
This interface provides the capability to encode raw VP8 streams.
vpx_codec_iface_t | vpx_codec_vp8_cx_algo
vpx_codec_iface_t * | vpx_codec_vp8_cx (void)

## Algorithm interface for VP9
This interface provides the capability to encode raw VP9 streams.
vpx_codec_iface_t | vpx_codec_vp9_cx_algo
vpx_codec_iface_t * | vpx_codec_vp9_cx (void)

## Detailed Description

## Macro Definition Documentation

#define VP8_EFLAG_NO_REF_LAST (1<<16)

Don't reference the last frame.

When this flag is set, the encoder will not use the last frame as a predictor. When not set, the encoder will choose whether to use the last frame or not automatically.

#define VP8_EFLAG_NO_REF_GF (1<<17)

Don't reference the golden frame.

When this flag is set, the encoder will not use the golden frame as a predictor. When not set, the encoder will choose whether to use the golden frame or not automatically.

#define VP8_EFLAG_NO_REF_ARF (1<<21)

Don't reference the alternate reference frame.

When this flag is set, the encoder will not use the alt ref frame as a predictor. When not set, the encoder will choose whether to use the alt ref frame or not automatically.

#define VP8_EFLAG_NO_UPD_LAST (1<<18)

Don't update the last frame.

When this flag is set, the encoder will not update the last frame with the contents of the current frame.

#define VP8_EFLAG_NO_UPD_GF (1<<22)

Don't update the golden frame.

When this flag is set, the encoder will not update the golden frame with the contents of the current frame.

#define VP8_EFLAG_NO_UPD_ARF (1<<23)

Don't update the alternate reference frame.

When this flag is set, the encoder will not update the alt ref frame with the contents of the current frame.

#define VP8_EFLAG_FORCE_GF (1<<19)

Force golden frame update.

When this flag is set, the encoder copy the contents of the current frame to the golden frame buffer.

#define VP8_EFLAG_FORCE_ARF (1<<24)

Force alternate reference frame update.

When this flag is set, the encoder copy the contents of the current frame to the alternate reference frame buffer.

#define VP8_EFLAG_NO_UPD_ENTROPY (1<<20)

Disable entropy update.

When this flag is set, the encoder will not update its internal entropy model based on the entropy of this frame.

## Typedef Documentation

typedef enum vpx_scaling_mode_1d VPX_SCALING_MODE

vpx 1-D scaling mode

This set of constants define 1-D vpx scaling modes

typedef struct vpx_roi_map vpx_roi_map_t

vpx region of interest map

These defines the data structures for the region of interest map

typedef struct vpx_active_map vpx_active_map_t

vpx active region map

These defines the data structures for active region map

typedef struct vpx_scaling_mode vpx_scaling_mode_t

vpx image scaling mode

This defines the data structure for image scaling mode

typedef struct vpx_svc_layer_id vpx_svc_layer_id_t

vp9 svc layer parameters

This defines the temporal layer id numbers for svc encoding. This is used with the VP9E_SET_SVC_LAYER_ID control to set the temporal layer id for the current frame.

## Enumeration Type Documentation

enum vp8e_enc_control_id

VPx encoder control functions.

This set of macros define the control functions available for VPx encoder interface.

See also
  vpx_codec_control

Enumerator
VP8E_UPD_ENTROPY | Codec control function to set mode of entropy update in encoder. Supported in codecs: VP8, VP9
VP8E_UPD_REFERENCE | Codec control function to set reference update mode in encoder. Supported in codecs: VP8, VP9
VP8E_USE_REFERENCE | Codec control function to set which reference frame encoder can use. Supported in codecs: VP8, VP9
VP8E_SET_ROI_MAP | Codec control function to pass an ROI map to encoder. Supported in codecs: VP8, VP9
VP8E_SET_ACTIVEMAP | Codec control function to pass an Active map to encoder. Supported in codecs: VP8, VP9
VP8E_SET_SCALEMODE | Codec control function to set encoder scaling mode. Supported in codecs: VP8, VP9
VP8E_SET_CPUUSED | Codec control function to set encoder internal speed settings. Changes in this value influences, among others, the encoder's selection of motion estimation methods. Values greater than 0 will increase encoder speed at the expense of quality. Note Valid range for VP8: -16..16 Valid range for VP9: -8..8 Supported in codecs: VP8, VP9
VP8E_SET_ENABLEAUTOALTREF | Codec control function to enable automatic set and use alf frames. Supported in codecs: VP8, VP9
VP8E_SET_NOISE_SENSITIVITY | control function to set noise sensitivity 0: off, 1: OnYOnly, 2: OnYUV, 3: OnYUVAggressive, 4: Adaptive Supported in codecs: VP8
VP8E_SET_SHARPNESS | Codec control function to set sharpness. Supported in codecs: VP8, VP9
VP8E_SET_STATIC_THRESHOLD | Codec control function to set the threshold for MBs treated static. Supported in codecs: VP8, VP9
VP8E_SET_TOKEN_PARTITIONS | Codec control function to set the number of token partitions. Supported in codecs: VP8
VP8E_GET_LAST_QUANTIZER | Codec control function to get last quantizer chosen by the encoder. Return value uses internal quantizer scale defined by the codec. Supported in codecs: VP8, VP9
VP8E_GET_LAST_QUANTIZER_64 | Codec control function to get last quantizer chosen by the encoder. Return value uses the 0..63 scale as used by the rc_*_quantizer config parameters. Supported in codecs: VP8, VP9
VP8E_SET_ARNR_MAXFRAMES | Codec control function to set the max no of frames to create arf. Supported in codecs: VP8, VP9
VP8E_SET_ARNR_STRENGTH | Codec control function to set the filter strength for the arf. Supported in codecs: VP8, VP9
VP8E_SET_ARNR_TYPE | Deprecated: control function to set the filter type to use for the arf.
VP8E_SET_TUNING | Codec control function to set visual tuning. Supported in codecs: VP8, VP9
VP8E_SET_CQ_LEVEL | Codec control function to set constrained quality level. Attention For this value to be used vpx_codec_enc_cfg_t::g_usage must be set to VPX_CQ. Note Valid range: 0..63 Supported in codecs: VP8, VP9
VP8E_SET_MAX_INTRA_BITRATE_PCT | Codec control function to set Max data rate for Intra frames. This value controls additional clamping on the maximum size of a keyframe. It is expressed as a percentage of the average per-frame bitrate, with the special (and default) value 0 meaning unlimited, or no additional clamping beyond the codec's built-in algorithm. For example, to allocate no more than 4.5 frames worth of bitrate to a keyframe, set this to 450. Supported in codecs: VP8, VP9
VP8E_SET_FRAME_FLAGS | Codec control function to set reference and update frame flags. Supported in codecs: VP8
VP9E_SET_MAX_INTER_BITRATE_PCT | Codec control function to set max data rate for Inter frames. This value controls additional clamping on the maximum size of an inter frame. It is expressed as a percentage of the average per-frame bitrate, with the special (and default) value 0 meaning unlimited, or no additional clamping beyond the codec's built-in algorithm. For example, to allow no more than 4.5 frames worth of bitrate to an inter frame, set this to 450. Supported in codecs: VP9
VP9E_SET_GF_CBR_BOOST_PCT | Boost percentage for Golden Frame in CBR mode. This value controls the amount of boost given to Golden Frame in CBR mode. It is expressed as a percentage of the average per-frame bitrate, with the special (and default) value 0 meaning the feature is off, i.e., no golden frame boost in CBR mode and average bitrate target is used. For example, to allow 100% more bits, i.e, 2X, in a golden frame than average frame, set this to 100. Supported in codecs: VP9
VP8E_SET_TEMPORAL_LAYER_ID | Codec control function to set the temporal layer id. For temporal scalability: this control allows the application to set the layer id for each frame to be encoded. Note that this control must be set for every frame prior to encoding. The usage of this control function supersedes the internal temporal pattern counter, which is now deprecated. Supported in codecs: VP8
VP8E_SET_SCREEN_CONTENT_MODE | Codec control function to set encoder screen content mode. Supported in codecs: VP8
VP9E_SET_LOSSLESS | Codec control function to set lossless encoding mode. VP9 can operate in lossless encoding mode, in which the bitstream produced will be able to decode and reconstruct a perfect copy of input source. This control function provides a mean to switch encoder into lossless coding mode(1) or normal coding mode(0) that may be lossy. 0 = lossy coding mode 1 = lossless coding mode By default, encoder operates in normal coding mode (maybe lossy). Supported in codecs: VP9
VP9E_SET_TILE_COLUMNS | Codec control function to set number of tile columns. In encoding and decoding, VP9 allows an input image frame be partitioned into separated vertical tile columns, which can be encoded or decoded independently. This enables easy implementation of parallel encoding and decoding. This control requests the encoder to use column tiles in encoding an input frame, with number of tile columns (in Log2 unit) as the parameter: 0 = 1 tile column 1 = 2 tile columns 2 = 4 tile columns ..... n = 2**n tile columns The requested tile columns will be capped by encoder based on image size limitation (The minimum width of a tile column is 256 pixel, the maximum is 4096). By default, the value is 0, i.e. one single column tile for entire image. Supported in codecs: VP9
VP9E_SET_TILE_ROWS | Codec control function to set number of tile rows. In encoding and decoding, VP9 allows an input image frame be partitioned into separated horizontal tile rows. Tile rows are encoded or decoded sequentially. Even though encoding/decoding of later tile rows depends on earlier ones, this allows the encoder to output data packets for tile rows prior to completely processing all tile rows in a frame, thereby reducing the latency in processing between input and output. The parameter for this control describes the number of tile rows, which has a valid range [0, 2]: 0 = 1 tile row 1 = 2 tile rows 2 = 4 tile rows By default, the value is 0, i.e. one single row tile for entire image. Supported in codecs: VP9
VP9E_SET_FRAME_PARALLEL_DECODING | Codec control function to enable frame parallel decoding feature. VP9 has a bitstream feature to reduce decoding dependency between frames by turning off backward update of probability context used in encoding and decoding. This allows staged parallel processing of more than one video frames in the decoder. This control function provides a mean to turn this feature on or off for bitstreams produced by encoder. By default, this feature is off. Supported in codecs: VP9
VP9E_SET_AQ_MODE | Codec control function to set adaptive quantization mode. VP9 has a segment based feature that allows encoder to adaptively change quantization parameter for each segment within a frame to improve the subjective quality. This control makes encoder operate in one of the several AQ_modes supported. By default, encoder operates with AQ_Mode 0(adaptive quantization off). Supported in codecs: VP9
VP9E_SET_FRAME_PERIODIC_BOOST | Codec control function to enable/disable periodic Q boost. One VP9 encoder speed feature is to enable quality boost by lowering frame level Q periodically. This control function provides a mean to turn on/off this feature. 0 = off 1 = on By default, the encoder is allowed to use this feature for appropriate encoding modes. Supported in codecs: VP9
VP9E_SET_NOISE_SENSITIVITY | Codec control function to set noise sensitivity. 0: off, 1: On(YOnly) Supported in codecs: VP9
VP9E_SET_SVC | Codec control function to turn on/off SVC in encoder. Note Return value is VPX_CODEC_INVALID_PARAM if the encoder does not support SVC in its current encoding mode 0: off, 1: on Supported in codecs: VP9
VP9E_SET_SVC_LAYER_ID | Codec control function to set svc layer for spatial and temporal. Note Valid ranges: 0..vpx_codec_enc_cfg::ss_number_layers for spatial layer and 0..vpx_codec_enc_cfg::ts_number_layers for temporal layer. Supported in codecs: VP9
VP9E_SET_TUNE_CONTENT | Codec control function to set content type. Note Valid parameter range: VP9E_CONTENT_DEFAULT = Regular video content (Default) VP9E_CONTENT_SCREEN = Screen capture content Supported in codecs: VP9
VP9E_SET_COLOR_SPACE | Codec control function to set color space info. Note Valid ranges: 0..7, default is "UNKNOWN". 0 = UNKNOWN, 1 = BT_601 2 = BT_709 3 = SMPTE_170 4 = SMPTE_240 5 = BT_2020 6 = RESERVED 7 = SRGB Supported in codecs: VP9

enum vpx_scaling_mode_1d

vpx 1-D scaling mode

This set of constants define 1-D vpx scaling modes

enum vp8e_token_partitions

VP8 token partition mode.

This defines VP8 partitioning mode for compressed data, i.e., the number of sub-streams in the bitstream. Used for parallelized decoding.

enum vp9e_tune_content

brief VP9 encoder content type

enum vp8e_tuning

VP8 model tuning parameters.

Changes the encoder to tune for certain types of input material.