/* * Copyright (c) 2016, Alliance for Open Media. All rights reserved * * This source code is subject to the terms of the BSD 2 Clause License and * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License * was not distributed with this source code in the LICENSE file, you can * obtain it at www.aomedia.org/license/software. If the Alliance for Open * Media Patent License 1.0 was not distributed with this source code in the * PATENTS file, you can obtain it at www.aomedia.org/license/patent. */ #ifndef AOM_AOM_AOM_ENCODER_H_ #define AOM_AOM_AOM_ENCODER_H_ /*!\defgroup encoder Encoder Algorithm Interface * \ingroup codec * This abstraction allows applications using this encoder to easily support * multiple video formats with minimal code duplication. This section describes * the interface common to all encoders. * @{ */ /*!\file * \brief Describes the encoder algorithm interface to applications. * * This file describes the interface between an application and a * video encoder algorithm. * */ #ifdef __cplusplus extern "C" { #endif #include "aom/aom_codec.h" #include "aom/aom_external_partition.h" /*!\brief Current ABI version number * * \internal * If this file is altered in any way that changes the ABI, this value * must be bumped. Examples include, but are not limited to, changing * types, removing or reassigning enums, adding/removing/rearranging * fields to structures */ #define AOM_ENCODER_ABI_VERSION \ (9 + AOM_CODEC_ABI_VERSION + AOM_EXT_PART_ABI_VERSION) /**<\hideinitializer*/ /*! \brief Encoder capabilities bitfield * * Each encoder advertises the capabilities it supports as part of its * ::aom_codec_iface_t interface structure. Capabilities are extra * interfaces or functionality, and are not required to be supported * by an encoder. * * The available flags are specified by AOM_CODEC_CAP_* defines. */ #define AOM_CODEC_CAP_PSNR 0x10000 /**< Can issue PSNR packets */ /*! Can support input images at greater than 8 bitdepth. */ #define AOM_CODEC_CAP_HIGHBITDEPTH 0x40000 /*! \brief Initialization-time Feature Enabling * * Certain codec features must be known at initialization time, to allow * for proper memory allocation. * * The available flags are specified by AOM_CODEC_USE_* defines. */ #define AOM_CODEC_USE_PSNR 0x10000 /**< Calculate PSNR on each frame */ /*!\brief Make the encoder output one partition at a time. */ #define AOM_CODEC_USE_HIGHBITDEPTH 0x40000 /**< Use high bitdepth */ /*!\brief Generic fixed size buffer structure * * This structure is able to hold a reference to any fixed size buffer. */ typedef struct aom_fixed_buf { void *buf; /**< Pointer to the data. Does NOT own the data! */ size_t sz; /**< Length of the buffer, in chars */ } aom_fixed_buf_t; /**< alias for struct aom_fixed_buf */ /*!\brief Error Resilient flags * * These flags define which error resilient features to enable in the * encoder. The flags are specified through the * aom_codec_enc_cfg::g_error_resilient variable. */ typedef uint32_t aom_codec_er_flags_t; /*!\brief Improve resiliency against losses of whole frames */ #define AOM_ERROR_RESILIENT_DEFAULT 0x1 /*!\brief Encoder output packet variants * * This enumeration lists the different kinds of data packets that can be * returned by calls to aom_codec_get_cx_data(). Algorithms \ref MAY * extend this list to provide additional functionality. */ enum aom_codec_cx_pkt_kind { AOM_CODEC_CX_FRAME_PKT, /**< Compressed video frame */ AOM_CODEC_STATS_PKT, /**< Two-pass statistics for this frame */ AOM_CODEC_FPMB_STATS_PKT, /**< first pass mb statistics for this frame */ AOM_CODEC_PSNR_PKT, /**< PSNR statistics for this frame */ AOM_CODEC_CUSTOM_PKT = 256 /**< Algorithm extensions */ }; /*!\brief Encoder output packet * * This structure contains the different kinds of output data the encoder * may produce while compressing a frame. */ typedef struct aom_codec_cx_pkt { enum aom_codec_cx_pkt_kind kind; /**< packet variant */ union { struct { void *buf; /**< compressed data buffer */ size_t sz; /**< length of compressed data */ /*!\brief time stamp to show frame (in timebase units) */ aom_codec_pts_t pts; /*!\brief duration to show frame (in timebase units) */ unsigned long duration; aom_codec_frame_flags_t flags; /**< flags for this frame */ /*!\brief the partition id defines the decoding order of the partitions. * Only applicable when "output partition" mode is enabled. First * partition has id 0.*/ int partition_id; /*!\brief size of the visible frame in this packet */ size_t vis_frame_size; } frame; /**< data for compressed frame packet */ aom_fixed_buf_t twopass_stats; /**< data for two-pass packet */ aom_fixed_buf_t firstpass_mb_stats; /**< first pass mb packet */ struct aom_psnr_pkt { unsigned int samples[4]; /**< Number of samples, total/y/u/v */ uint64_t sse[4]; /**< sum squared error, total/y/u/v */ double psnr[4]; /**< PSNR, total/y/u/v */ /*!\brief Number of samples, total/y/u/v when * input bit-depth < stream bit-depth.*/ unsigned int samples_hbd[4]; /*!\brief sum squared error, total/y/u/v when * input bit-depth < stream bit-depth.*/ uint64_t sse_hbd[4]; /*!\brief PSNR, total/y/u/v when * input bit-depth < stream bit-depth.*/ double psnr_hbd[4]; } psnr; /**< data for PSNR packet */ aom_fixed_buf_t raw; /**< data for arbitrary packets */ } data; /**< packet data */ } aom_codec_cx_pkt_t; /**< alias for struct aom_codec_cx_pkt */ /*!\brief Rational Number * * This structure holds a fractional value. */ typedef struct aom_rational { int num; /**< fraction numerator */ int den; /**< fraction denominator */ } aom_rational_t; /**< alias for struct aom_rational */ /*!\brief Multi-pass Encoding Pass */ enum aom_enc_pass { AOM_RC_ONE_PASS, /**< Single pass mode */ AOM_RC_FIRST_PASS, /**< First pass of multi-pass mode */ AOM_RC_LAST_PASS /**< Final pass of multi-pass mode */ }; /*!\brief Rate control mode */ enum aom_rc_mode { AOM_VBR, /**< Variable Bit Rate (VBR) mode */ AOM_CBR, /**< Constant Bit Rate (CBR) mode */ AOM_CQ, /**< Constrained Quality (CQ) mode */ AOM_Q, /**< Constant Quality (Q) mode */ }; /*!\brief Keyframe placement mode. * * This enumeration determines whether keyframes are placed automatically by * the encoder or whether this behavior is disabled. Older releases of this * SDK were implemented such that AOM_KF_FIXED meant keyframes were disabled. * This name is confusing for this behavior, so the new symbols to be used * are AOM_KF_AUTO and AOM_KF_DISABLED. */ enum aom_kf_mode { AOM_KF_FIXED, /**< deprecated, implies AOM_KF_DISABLED */ AOM_KF_AUTO, /**< Encoder determines optimal placement automatically */ AOM_KF_DISABLED = 0 /**< Encoder does not place keyframes. */ }; /*!\brief Frame super-resolution mode. */ typedef enum { /**< Frame super-resolution is disabled for all frames. */ AOM_SUPERRES_NONE, /**< All frames are coded at the specified scale and super-resolved. */ AOM_SUPERRES_FIXED, /**< All frames are coded at a random scale and super-resolved. */ AOM_SUPERRES_RANDOM, /**< Super-resolution scale for each frame is determined based on the q index of that frame. */ AOM_SUPERRES_QTHRESH, /**< Full-resolution or super-resolution and the scale (in case of super-resolution) are automatically selected for each frame. */ AOM_SUPERRES_AUTO, } aom_superres_mode; /*!\brief Encoder Config Options * * This type allows to enumerate and control flags defined for encoder control * via config file at runtime. */ typedef struct cfg_options { /*!\brief Indicate init by cfg file * 0 or 1 */ unsigned int init_by_cfg_file; /*!\brief Superblock size * 0, 64 or 128 */ unsigned int super_block_size; /*!\brief max partition size * 8, 16, 32, 64, 128 */ unsigned int max_partition_size; /*!\brief min partition size * 8, 16, 32, 64, 128 */ unsigned int min_partition_size; /*!\brief disable AB Shape partition type * */ unsigned int disable_ab_partition_type; /*!\brief disable rectangular partition type * */ unsigned int disable_rect_partition_type; /*!\brief disable 1:4/4:1 partition type * */ unsigned int disable_1to4_partition_type; /*!\brief disable flip and identity transform type * */ unsigned int disable_flip_idtx; /*!\brief disable CDEF filter * */ unsigned int disable_cdef; /*!\brief disable Loop Restoration Filter * */ unsigned int disable_lr; /*!\brief disable OBMC * */ unsigned int disable_obmc; /*!\brief disable Warped Motion * */ unsigned int disable_warp_motion; /*!\brief disable global motion * */ unsigned int disable_global_motion; /*!\brief disable dist weighted compound * */ unsigned int disable_dist_wtd_comp; /*!\brief disable diff weighted compound * */ unsigned int disable_diff_wtd_comp; /*!\brief disable inter/intra compound * */ unsigned int disable_inter_intra_comp; /*!\brief disable masked compound * */ unsigned int disable_masked_comp; /*!\brief disable one sided compound * */ unsigned int disable_one_sided_comp; /*!\brief disable Palette * */ unsigned int disable_palette; /*!\brief disable Intra Block Copy * */ unsigned int disable_intrabc; /*!\brief disable chroma from luma * */ unsigned int disable_cfl; /*!\brief disable intra smooth mode * */ unsigned int disable_smooth_intra; /*!\brief disable filter intra * */ unsigned int disable_filter_intra; /*!\brief disable dual filter * */ unsigned int disable_dual_filter; /*!\brief disable intra angle delta * */ unsigned int disable_intra_angle_delta; /*!\brief disable intra edge filter * */ unsigned int disable_intra_edge_filter; /*!\brief disable 64x64 transform * */ unsigned int disable_tx_64x64; /*!\brief disable smooth inter/intra * */ unsigned int disable_smooth_inter_intra; /*!\brief disable inter/inter wedge comp * */ unsigned int disable_inter_inter_wedge; /*!\brief disable inter/intra wedge comp * */ unsigned int disable_inter_intra_wedge; /*!\brief disable paeth intra * */ unsigned int disable_paeth_intra; /*!\brief disable trellis quantization * */ unsigned int disable_trellis_quant; /*!\brief disable ref frame MV * */ unsigned int disable_ref_frame_mv; /*!\brief use reduced reference frame set * */ unsigned int reduced_reference_set; /*!\brief use reduced transform type set * */ unsigned int reduced_tx_type_set; } cfg_options_t; /*!\brief Encoded Frame Flags * * This type indicates a bitfield to be passed to aom_codec_encode(), defining * per-frame boolean values. By convention, bits common to all codecs will be * named AOM_EFLAG_*, and bits specific to an algorithm will be named * /algo/_eflag_*. The lower order 16 bits are reserved for common use. */ typedef long aom_enc_frame_flags_t; /*!\brief Force this frame to be a keyframe */ #define AOM_EFLAG_FORCE_KF (1 << 0) /*!\brief Encoder configuration structure * * This structure contains the encoder settings that have common representations * across all codecs. This doesn't imply that all codecs support all features, * however. */ typedef struct aom_codec_enc_cfg { /* * generic settings (g) */ /*!\brief Algorithm specific "usage" value * * Algorithms may define multiple values for usage, which may convey the * intent of how the application intends to use the stream. If this value * is non-zero, consult the documentation for the codec to determine its * meaning. */ unsigned int g_usage; /*!\brief Maximum number of threads to use * * For multi-threaded implementations, use no more than this number of * threads. The codec may use fewer threads than allowed. The value * 0 is equivalent to the value 1. */ unsigned int g_threads; /*!\brief Bitstream profile to use * * Some codecs support a notion of multiple bitstream profiles. Typically * this maps to a set of features that are turned on or off. Often the * profile to use is determined by the features of the intended decoder. * Consult the documentation for the codec to determine the valid values * for this parameter, or set to zero for a sane default. */ unsigned int g_profile; /**< profile of bitstream to use */ /*!\brief Width of the frame * * This value identifies the presentation resolution of the frame, * in pixels. Note that the frames passed as input to the encoder must * have this resolution. Frames will be presented by the decoder in this * resolution, independent of any spatial resampling the encoder may do. */ unsigned int g_w; /*!\brief Height of the frame * * This value identifies the presentation resolution of the frame, * in pixels. Note that the frames passed as input to the encoder must * have this resolution. Frames will be presented by the decoder in this * resolution, independent of any spatial resampling the encoder may do. */ unsigned int g_h; /*!\brief Max number of frames to encode * */ unsigned int g_limit; /*!\brief Forced maximum width of the frame * * If this value is non-zero then it is used to force the maximum frame * width written in write_sequence_header(). */ unsigned int g_forced_max_frame_width; /*!\brief Forced maximum height of the frame * * If this value is non-zero then it is used to force the maximum frame * height written in write_sequence_header(). */ unsigned int g_forced_max_frame_height; /*!\brief Bit-depth of the codec * * This value identifies the bit_depth of the codec, * Only certain bit-depths are supported as identified in the * aom_bit_depth_t enum. */ aom_bit_depth_t g_bit_depth; /*!\brief Bit-depth of the input frames * * This value identifies the bit_depth of the input frames in bits. * Note that the frames passed as input to the encoder must have * this bit-depth. */ unsigned int g_input_bit_depth; /*!\brief Stream timebase units * * Indicates the smallest interval of time, in seconds, used by the stream. * For fixed frame rate material, or variable frame rate material where * frames are timed at a multiple of a given clock (ex: video capture), * the \ref RECOMMENDED method is to set the timebase to the reciprocal * of the frame rate (ex: 1001/30000 for 29.970 Hz NTSC). This allows the * pts to correspond to the frame number, which can be handy. For * re-encoding video from containers with absolute time timestamps, the * \ref RECOMMENDED method is to set the timebase to that of the parent * container or multimedia framework (ex: 1/1000 for ms, as in FLV). */ struct aom_rational g_timebase; /*!\brief Enable error resilient modes. * * The error resilient bitfield indicates to the encoder which features * it should enable to take measures for streaming over lossy or noisy * links. */ aom_codec_er_flags_t g_error_resilient; /*!\brief Multi-pass Encoding Mode * * This value should be set to the current phase for multi-pass encoding. * For single pass, set to #AOM_RC_ONE_PASS. */ enum aom_enc_pass g_pass; /*!\brief Allow lagged encoding * * If set, this value allows the encoder to consume a number of input * frames before producing output frames. This allows the encoder to * base decisions for the current frame on future frames. This does * increase the latency of the encoding pipeline, so it is not appropriate * in all situations (ex: realtime encoding). * * Note that this is a maximum value -- the encoder may produce frames * sooner than the given limit. Set this value to 0 to disable this * feature. */ unsigned int g_lag_in_frames; /* * rate control settings (rc) */ /*!\brief Temporal resampling configuration, if supported by the codec. * * Temporal resampling allows the codec to "drop" frames as a strategy to * meet its target data rate. This can cause temporal discontinuities in * the encoded video, which may appear as stuttering during playback. This * trade-off is often acceptable, but for many applications is not. It can * be disabled in these cases. * * Note that not all codecs support this feature. All aom AVx codecs do. * For other codecs, consult the documentation for that algorithm. * * This threshold is described as a percentage of the target data buffer. * When the data buffer falls below this percentage of fullness, a * dropped frame is indicated. Set the threshold to zero (0) to disable * this feature. */ unsigned int rc_dropframe_thresh; /*!\brief Mode for spatial resampling, if supported by the codec. * * Spatial resampling allows the codec to compress a lower resolution * version of the frame, which is then upscaled by the decoder to the * correct presentation resolution. This increases visual quality at * low data rates, at the expense of CPU time on the encoder/decoder. */ unsigned int rc_resize_mode; /*!\brief Frame resize denominator. * * The denominator for resize to use, assuming 8 as the numerator. * * Valid denominators are 8 - 16 for now. */ unsigned int rc_resize_denominator; /*!\brief Keyframe resize denominator. * * The denominator for resize to use, assuming 8 as the numerator. * * Valid denominators are 8 - 16 for now. */ unsigned int rc_resize_kf_denominator; /*!\brief Frame super-resolution scaling mode. * * Similar to spatial resampling, frame super-resolution integrates * upscaling after the encode/decode process. Taking control of upscaling and * using restoration filters should allow it to outperform normal resizing. */ aom_superres_mode rc_superres_mode; /*!\brief Frame super-resolution denominator. * * The denominator for superres to use. If fixed it will only change if the * cumulative scale change over resizing and superres is greater than 1/2; * this forces superres to reduce scaling. * * Valid denominators are 8 to 16. * * Used only by AOM_SUPERRES_FIXED. */ unsigned int rc_superres_denominator; /*!\brief Keyframe super-resolution denominator. * * The denominator for superres to use. If fixed it will only change if the * cumulative scale change over resizing and superres is greater than 1/2; * this forces superres to reduce scaling. * * Valid denominators are 8 - 16 for now. */ unsigned int rc_superres_kf_denominator; /*!\brief Frame super-resolution q threshold. * * The q level threshold after which superres is used. * Valid values are 1 to 63. * * Used only by AOM_SUPERRES_QTHRESH */ unsigned int rc_superres_qthresh; /*!\brief Keyframe super-resolution q threshold. * * The q level threshold after which superres is used for key frames. * Valid values are 1 to 63. * * Used only by AOM_SUPERRES_QTHRESH */ unsigned int rc_superres_kf_qthresh; /*!\brief Rate control algorithm to use. * * Indicates whether the end usage of this stream is to be streamed over * a bandwidth constrained link, indicating that Constant Bit Rate (CBR) * mode should be used, or whether it will be played back on a high * bandwidth link, as from a local disk, where higher variations in * bitrate are acceptable. */ enum aom_rc_mode rc_end_usage; /*!\brief Two-pass stats buffer. * * A buffer containing all of the stats packets produced in the first * pass, concatenated. */ aom_fixed_buf_t rc_twopass_stats_in; /*!\brief first pass mb stats buffer. * * A buffer containing all of the first pass mb stats packets produced * in the first pass, concatenated. */ aom_fixed_buf_t rc_firstpass_mb_stats_in; /*!\brief Target data rate * * Target bandwidth to use for this stream, in kilobits per second. */ unsigned int rc_target_bitrate; /* * quantizer settings */ /*!\brief Minimum (Best Quality) Quantizer * * The quantizer is the most direct control over the quality of the * encoded image. The range of valid values for the quantizer is codec * specific. Consult the documentation for the codec to determine the * values to use. To determine the range programmatically, call * aom_codec_enc_config_default() with a usage value of 0. */ unsigned int rc_min_quantizer; /*!\brief Maximum (Worst Quality) Quantizer * * The quantizer is the most direct control over the quality of the * encoded image. The range of valid values for the quantizer is codec * specific. Consult the documentation for the codec to determine the * values to use. To determine the range programmatically, call * aom_codec_enc_config_default() with a usage value of 0. */ unsigned int rc_max_quantizer; /* * bitrate tolerance */ /*!\brief Rate control adaptation undershoot control * * This value, controls the tolerance of the VBR algorithm to undershoot * and is used as a trigger threshold for more agressive adaptation of Q. * * Valid values in the range 0-100. */ unsigned int rc_undershoot_pct; /*!\brief Rate control adaptation overshoot control * * This value, controls the tolerance of the VBR algorithm to overshoot * and is used as a trigger threshold for more agressive adaptation of Q. * * Valid values in the range 0-1000. */ unsigned int rc_overshoot_pct; /* * decoder buffer model parameters */ /*!\brief Decoder Buffer Size * * This value indicates the amount of data that may be buffered by the * decoding application. Note that this value is expressed in units of * time (milliseconds). For example, a value of 5000 indicates that the * client will buffer (at least) 5000ms worth of encoded data. Use the * target bitrate (#rc_target_bitrate) to convert to bits/bytes, if * necessary. */ unsigned int rc_buf_sz; /*!\brief Decoder Buffer Initial Size * * This value indicates the amount of data that will be buffered by the * decoding application prior to beginning playback. This value is * expressed in units of time (milliseconds). Use the target bitrate * (#rc_target_bitrate) to convert to bits/bytes, if necessary. */ unsigned int rc_buf_initial_sz; /*!\brief Decoder Buffer Optimal Size * * This value indicates the amount of data that the encoder should try * to maintain in the decoder's buffer. This value is expressed in units * of time (milliseconds). Use the target bitrate (#rc_target_bitrate) * to convert to bits/bytes, if necessary. */ unsigned int rc_buf_optimal_sz; /* * 2 pass rate control parameters */ /*!\brief Two-pass mode CBR/VBR bias * * Bias, expressed on a scale of 0 to 100, for determining target size * for the current frame. The value 0 indicates the optimal CBR mode * value should be used. The value 100 indicates the optimal VBR mode * value should be used. Values in between indicate which way the * encoder should "lean." */ unsigned int rc_2pass_vbr_bias_pct; /*!\brief Two-pass mode per-GOP minimum bitrate * * This value, expressed as a percentage of the target bitrate, indicates * the minimum bitrate to be used for a single GOP (aka "section") */ unsigned int rc_2pass_vbr_minsection_pct; /*!\brief Two-pass mode per-GOP maximum bitrate * * This value, expressed as a percentage of the target bitrate, indicates * the maximum bitrate to be used for a single GOP (aka "section") */ unsigned int rc_2pass_vbr_maxsection_pct; /* * keyframing settings (kf) */ /*!\brief Option to enable forward reference key frame * */ int fwd_kf_enabled; /*!\brief Keyframe placement mode * * This value indicates whether the encoder should place keyframes at a * fixed interval, or determine the optimal placement automatically * (as governed by the #kf_min_dist and #kf_max_dist parameters) */ enum aom_kf_mode kf_mode; /*!\brief Keyframe minimum interval * * This value, expressed as a number of frames, prevents the encoder from * placing a keyframe nearer than kf_min_dist to the previous keyframe. At * least kf_min_dist frames non-keyframes will be coded before the next * keyframe. Set kf_min_dist equal to kf_max_dist for a fixed interval. */ unsigned int kf_min_dist; /*!\brief Keyframe maximum interval * * This value, expressed as a number of frames, forces the encoder to code * a keyframe if one has not been coded in the last kf_max_dist frames. * A value of 0 implies all frames will be keyframes. Set kf_min_dist * equal to kf_max_dist for a fixed interval. */ unsigned int kf_max_dist; /*!\brief sframe interval * * This value, expressed as a number of frames, forces the encoder to code * an S-Frame every sframe_dist frames. */ unsigned int sframe_dist; /*!\brief sframe insertion mode * * This value must be set to 1 or 2, and tells the encoder how to insert * S-Frames. It will only have an effect if sframe_dist != 0. * * If altref is enabled: * - if sframe_mode == 1, the considered frame will be made into an * S-Frame only if it is an altref frame * - if sframe_mode == 2, the next altref frame will be made into an * S-Frame. * * Otherwise: the considered frame will be made into an S-Frame. */ unsigned int sframe_mode; /*!\brief Tile coding mode * * This value indicates the tile coding mode. * A value of 0 implies a normal non-large-scale tile coding. A value of 1 * implies a large-scale tile coding. */ unsigned int large_scale_tile; /*!\brief Monochrome mode * * If this is nonzero, the encoder will generate a monochrome stream * with no chroma planes. */ unsigned int monochrome; /*!\brief full_still_picture_hdr * * If this is nonzero, the encoder will generate a full header even for * still picture encoding. if zero, a reduced header is used for still * picture. This flag has no effect when a regular video with more than * a single frame is encoded. */ unsigned int full_still_picture_hdr; /*!\brief Bitstream syntax mode * * This value indicates the bitstream syntax mode. * A value of 0 indicates bitstream is saved as Section 5 bitstream. A value * of 1 indicates the bitstream is saved in Annex-B format */ unsigned int save_as_annexb; /*!\brief Number of explicit tile widths specified * * This value indicates the number of tile widths specified * A value of 0 implies no tile widths are specified. * Tile widths are given in the array tile_widths[] */ int tile_width_count; /*!\brief Number of explicit tile heights specified * * This value indicates the number of tile heights specified * A value of 0 implies no tile heights are specified. * Tile heights are given in the array tile_heights[] */ int tile_height_count; /*!\brief Maximum number of tile widths in tile widths array * * This define gives the maximum number of elements in the tile_widths array. */ #define MAX_TILE_WIDTHS 64 // maximum tile width array length /*!\brief Array of specified tile widths * * This array specifies tile widths (and may be empty) * The number of widths specified is given by tile_width_count */ int tile_widths[MAX_TILE_WIDTHS]; /*!\brief Maximum number of tile heights in tile heights array. * * This define gives the maximum number of elements in the tile_heights array. */ #define MAX_TILE_HEIGHTS 64 // maximum tile height array length /*!\brief Array of specified tile heights * * This array specifies tile heights (and may be empty) * The number of heights specified is given by tile_height_count */ int tile_heights[MAX_TILE_HEIGHTS]; /*!\brief Whether encoder should use fixed QP offsets. * * If a value of 1 is provided, encoder will use fixed QP offsets for frames * at different levels of the pyramid. * - If 'fixed_qp_offsets' is also provided, encoder will use the given * offsets * - If not, encoder will select the fixed offsets based on the cq-level * provided. * If a value of 0 is provided and fixed_qp_offset are not provided, encoder * will NOT use fixed QP offsets. * Note: This option is only relevant for --end-usage=q. */ unsigned int use_fixed_qp_offsets; /*!\brief Number of fixed QP offsets * * This defines the number of elements in the fixed_qp_offsets array. */ #define FIXED_QP_OFFSET_COUNT 5 /*!\brief Array of fixed QP offsets * * This array specifies fixed QP offsets (range: 0 to 63) for frames at * different levels of the pyramid. It is a comma-separated list of 5 values: * - QP offset for keyframe * - QP offset for ALTREF frame * - QP offset for 1st level internal ARF * - QP offset for 2nd level internal ARF * - QP offset for 3rd level internal ARF * Notes: * - QP offset for leaf level frames is not explicitly specified. These frames * use the worst quality allowed (--cq-level). * - This option is only relevant for --end-usage=q. */ int fixed_qp_offsets[FIXED_QP_OFFSET_COUNT]; /*!\brief Options defined per config file * */ cfg_options_t encoder_cfg; } aom_codec_enc_cfg_t; /**< alias for struct aom_codec_enc_cfg */ /*!\brief Initialize an encoder instance * * Initializes a encoder context using the given interface. Applications * should call the aom_codec_enc_init convenience macro instead of this * function directly, to ensure that the ABI version number parameter * is properly initialized. * * If the library was configured with --disable-multithread, this call * is not thread safe and should be guarded with a lock if being used * in a multithreaded context. * * \param[in] ctx Pointer to this instance's context. * \param[in] iface Pointer to the algorithm interface to use. * \param[in] cfg Configuration to use, if known. * \param[in] flags Bitfield of AOM_CODEC_USE_* flags * \param[in] ver ABI version number. Must be set to * AOM_ENCODER_ABI_VERSION * \retval #AOM_CODEC_OK * The decoder algorithm initialized. * \retval #AOM_CODEC_MEM_ERROR * Memory allocation failed. */ aom_codec_err_t aom_codec_enc_init_ver(aom_codec_ctx_t *ctx, aom_codec_iface_t *iface, const aom_codec_enc_cfg_t *cfg, aom_codec_flags_t flags, int ver); /*!\brief Convenience macro for aom_codec_enc_init_ver() * * Ensures the ABI version parameter is properly set. */ #define aom_codec_enc_init(ctx, iface, cfg, flags) \ aom_codec_enc_init_ver(ctx, iface, cfg, flags, AOM_ENCODER_ABI_VERSION) /*!\brief Get the default configuration for a usage. * * Initializes an encoder configuration structure with default values. Supports * the notion of "usages" so that an algorithm may offer different default * settings depending on the user's intended goal. This function \ref SHOULD * be called by all applications to initialize the configuration structure * before specializing the configuration with application specific values. * * \param[in] iface Pointer to the algorithm interface to use. * \param[out] cfg Configuration buffer to populate. * \param[in] usage Algorithm specific usage value. For AV1, must be * set to AOM_USAGE_GOOD_QUALITY (0), * AOM_USAGE_REALTIME (1), or AOM_USAGE_ALL_INTRA (2). * * \retval #AOM_CODEC_OK * The configuration was populated. * \retval #AOM_CODEC_INCAPABLE * Interface is not an encoder interface. * \retval #AOM_CODEC_INVALID_PARAM * A parameter was NULL, or the usage value was not recognized. */ aom_codec_err_t aom_codec_enc_config_default(aom_codec_iface_t *iface, aom_codec_enc_cfg_t *cfg, unsigned int usage); /*!\brief Set or change configuration * * Reconfigures an encoder instance according to the given configuration. * * \param[in] ctx Pointer to this instance's context * \param[in] cfg Configuration buffer to use * * \retval #AOM_CODEC_OK * The configuration was populated. * \retval #AOM_CODEC_INCAPABLE * Interface is not an encoder interface. * \retval #AOM_CODEC_INVALID_PARAM * A parameter was NULL, or the usage value was not recognized. */ aom_codec_err_t aom_codec_enc_config_set(aom_codec_ctx_t *ctx, const aom_codec_enc_cfg_t *cfg); /*!\brief Get global stream headers * * Retrieves a stream level global header packet, if supported by the codec. * Calls to this function should be deferred until all configuration information * has been passed to libaom. Otherwise the global header data may be * invalidated by additional configuration changes. * * The AV1 implementation of this function returns an OBU. The OBU returned is * in Low Overhead Bitstream Format. Specifically, the obu_has_size_field bit is * set, and the buffer contains the obu_size field for the returned OBU. * * \param[in] ctx Pointer to this instance's context * * \retval NULL * Encoder does not support global header, or an error occurred while * generating the global header. * * \retval Non-NULL * Pointer to buffer containing global header packet. The caller owns the * memory associated with this buffer, and must free the 'buf' member of the * aom_fixed_buf_t as well as the aom_fixed_buf_t pointer. Memory returned * must be freed via call to free(). */ aom_fixed_buf_t *aom_codec_get_global_headers(aom_codec_ctx_t *ctx); /*!\brief usage parameter analogous to AV1 GOOD QUALITY mode. */ #define AOM_USAGE_GOOD_QUALITY (0) /*!\brief usage parameter analogous to AV1 REALTIME mode. */ #define AOM_USAGE_REALTIME (1) /*!\brief usage parameter analogous to AV1 all intra mode. */ #define AOM_USAGE_ALL_INTRA (2) /*!\brief Encode a frame * * Encodes a video frame at the given "presentation time." The presentation * time stamp (PTS) \ref MUST be strictly increasing. * * When the last frame has been passed to the encoder, this function should * continue to be called in a loop, with the img parameter set to NULL. This * will signal the end-of-stream condition to the encoder and allow it to * encode any held buffers. Encoding is complete when aom_codec_encode() is * called with img set to NULL and aom_codec_get_cx_data() returns no data. * * \param[in] ctx Pointer to this instance's context * \param[in] img Image data to encode, NULL to flush. * \param[in] pts Presentation time stamp, in timebase units. If img * is NULL, pts is ignored. * \param[in] duration Duration to show frame, in timebase units. If img * is not NULL, duration must be nonzero. If img is * NULL, duration is ignored. * \param[in] flags Flags to use for encoding this frame. * * \retval #AOM_CODEC_OK * The configuration was populated. * \retval #AOM_CODEC_INCAPABLE * Interface is not an encoder interface. * \retval #AOM_CODEC_INVALID_PARAM * A parameter was NULL, the image format is unsupported, etc. */ aom_codec_err_t aom_codec_encode(aom_codec_ctx_t *ctx, const aom_image_t *img, aom_codec_pts_t pts, unsigned long duration, aom_enc_frame_flags_t flags); /*!\brief Set compressed data output buffer * * Sets the buffer that the codec should output the compressed data * into. This call effectively sets the buffer pointer returned in the * next AOM_CODEC_CX_FRAME_PKT packet. Subsequent packets will be * appended into this buffer. The buffer is preserved across frames, * so applications must periodically call this function after flushing * the accumulated compressed data to disk or to the network to reset * the pointer to the buffer's head. * * pad_before bytes will be skipped before writing the compressed * data, and pad_after bytes will be appended to the packet. The size * of the packet will be the sum of the size of the actual compressed * data, pad_before, and pad_after. The padding bytes will be preserved * (not overwritten). * * Note that calling this function does not guarantee that the returned * compressed data will be placed into the specified buffer. In the * event that the encoded data will not fit into the buffer provided, * the returned packet \ref MAY point to an internal buffer, as it would * if this call were never used. In this event, the output packet will * NOT have any padding, and the application must free space and copy it * to the proper place. This is of particular note in configurations * that may output multiple packets for a single encoded frame (e.g., lagged * encoding) or if the application does not reset the buffer periodically. * * Applications may restore the default behavior of the codec providing * the compressed data buffer by calling this function with a NULL * buffer. * * Applications \ref MUSTNOT call this function during iteration of * aom_codec_get_cx_data(). * * \param[in] ctx Pointer to this instance's context * \param[in] buf Buffer to store compressed data into * \param[in] pad_before Bytes to skip before writing compressed data * \param[in] pad_after Bytes to skip after writing compressed data * * \retval #AOM_CODEC_OK * The buffer was set successfully. * \retval #AOM_CODEC_INVALID_PARAM * A parameter was NULL, the image format is unsupported, etc. */ aom_codec_err_t aom_codec_set_cx_data_buf(aom_codec_ctx_t *ctx, const aom_fixed_buf_t *buf, unsigned int pad_before, unsigned int pad_after); /*!\brief Encoded data iterator * * Iterates over a list of data packets to be passed from the encoder to the * application. The different kinds of packets available are enumerated in * #aom_codec_cx_pkt_kind. * * #AOM_CODEC_CX_FRAME_PKT packets should be passed to the application's * muxer. Multiple compressed frames may be in the list. * #AOM_CODEC_STATS_PKT packets should be appended to a global buffer. * * The application \ref MUST silently ignore any packet kinds that it does * not recognize or support. * * The data buffers returned from this function are only guaranteed to be * valid until the application makes another call to any aom_codec_* function. * * \param[in] ctx Pointer to this instance's context * \param[in,out] iter Iterator storage, initialized to NULL * * \return Returns a pointer to an output data packet (compressed frame data, * two-pass statistics, etc.) or NULL to signal end-of-list. * */ const aom_codec_cx_pkt_t *aom_codec_get_cx_data(aom_codec_ctx_t *ctx, aom_codec_iter_t *iter); /*!\brief Get Preview Frame * * Returns an image that can be used as a preview. Shows the image as it would * exist at the decompressor. The application \ref MUST NOT write into this * image buffer. * * \param[in] ctx Pointer to this instance's context * * \return Returns a pointer to a preview image, or NULL if no image is * available. * */ const aom_image_t *aom_codec_get_preview_frame(aom_codec_ctx_t *ctx); /*!@} - end defgroup encoder*/ #ifdef __cplusplus } #endif #endif // AOM_AOM_AOM_ENCODER_H_