| /* |
| * Copyright (c) 2010 The WebM project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| |
| /*!\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 vpx_encoder.h |
| * \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 |
| |
| #ifndef VPX_ENCODER_H |
| #define VPX_ENCODER_H |
| #include "vpx_codec.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 VPX_ENCODER_ABI_VERSION (2 + VPX_CODEC_ABI_VERSION) /**<\hideinitializer*/ |
| |
| |
| /*! \brief Encoder capabilities bitfield |
| * |
| * Each encoder advertises the capabilities it supports as part of its |
| * ::vpx_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 specifiedby VPX_CODEC_CAP_* defines. |
| */ |
| #define VPX_CODEC_CAP_PSNR 0x10000 /**< Can issue PSNR packets */ |
| |
| |
| /*! \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 VPX_CODEC_USE_* defines. |
| */ |
| #define VPX_CODEC_USE_PSNR 0x10000 /**< Calculate PSNR on each frame */ |
| |
| |
| /*!\brief Generic fixed size buffer structure |
| * |
| * This structure is able to hold a reference to any fixed size buffer. |
| */ |
| typedef struct vpx_fixed_buf |
| { |
| void *buf; /**< Pointer to the data */ |
| size_t sz; /**< Length of the buffer, in chars */ |
| } vpx_fixed_buf_t; /**< alias for struct vpx_fixed_buf */ |
| |
| |
| /*!\brief Time Stamp Type |
| * |
| * An integer, which when multiplied by the stream's time base, provides |
| * the absolute time of a sample. |
| */ |
| typedef int64_t vpx_codec_pts_t; |
| |
| |
| /*!\brief Compressed Frame Flags |
| * |
| * This type represents a bitfield containing information about a compressed |
| * frame that may be useful to an application. The most significant 16 bits |
| * can be used by an algorithm to provide additional detail, for example to |
| * support frame types that are codec specific (MPEG-1 D-frames for example) |
| */ |
| typedef uint32_t vpx_codec_frame_flags_t; |
| #define VPX_FRAME_IS_KEY 0x1 /**< frame is the start of a GOP */ |
| #define VPX_FRAME_IS_DROPPABLE 0x2 /**< frame can be dropped without affecting |
| the stream (no future frame depends on |
| this one) */ |
| #define VPX_FRAME_IS_INVISIBLE 0x4 /**< frame should be decoded but will not |
| be shown */ |
| |
| |
| /*!\brief Encoder output packet variants |
| * |
| * This enumeration lists the different kinds of data packets that can be |
| * returned by calls to vpx_codec_get_cx_data(). Algorithms \ref MAY |
| * extend this list to provide additional functionality. |
| */ |
| enum vpx_codec_cx_pkt_kind |
| { |
| VPX_CODEC_CX_FRAME_PKT, /**< Compressed video frame */ |
| VPX_CODEC_STATS_PKT, /**< Two-pass statistics for this frame */ |
| VPX_CODEC_PSNR_PKT, /**< PSNR statistics for this frame */ |
| VPX_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 vpx_codec_cx_pkt |
| { |
| enum vpx_codec_cx_pkt_kind kind; /**< packet variant */ |
| union |
| { |
| struct |
| { |
| void *buf; /**< compressed data buffer */ |
| size_t sz; /**< length of compressed data */ |
| vpx_codec_pts_t pts; /**< time stamp to show frame |
| (in timebase units) */ |
| unsigned long duration; /**< duration to show frame |
| (in timebase units) */ |
| vpx_codec_frame_flags_t flags; /**< flags for this frame */ |
| } frame; /**< data for compressed frame packet */ |
| struct vpx_fixed_buf twopass_stats; /**< data for two-pass packet */ |
| struct vpx_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 */ |
| } psnr; /**< data for PSNR packet */ |
| struct vpx_fixed_buf raw; /**< data for arbitrary packets */ |
| |
| /* This packet size is fixed to allow codecs to extend this |
| * interface without having to manage storage for raw packets, |
| * ie if it's smaller than 128 bytes, you can store in the |
| * packet list directly. |
| */ |
| char pad[128 - sizeof(enum vpx_codec_cx_pkt_kind)]; /**< fixed sz */ |
| } data; /**< packet data */ |
| } vpx_codec_cx_pkt_t; /**< alias for struct vpx_codec_cx_pkt */ |
| |
| |
| /*!\brief Rational Number |
| * |
| * This structure holds a fractional value. |
| */ |
| typedef struct vpx_rational |
| { |
| int num; /**< fraction numerator */ |
| int den; /**< fraction denominator */ |
| } vpx_rational_t; /**< alias for struct vpx_rational */ |
| |
| |
| /*!\brief Multi-pass Encoding Pass */ |
| enum vpx_enc_pass |
| { |
| VPX_RC_ONE_PASS, /**< Single pass mode */ |
| VPX_RC_FIRST_PASS, /**< First pass of multi-pass mode */ |
| VPX_RC_LAST_PASS /**< Final pass of multi-pass mode */ |
| }; |
| |
| |
| /*!\brief Rate control mode */ |
| enum vpx_rc_mode |
| { |
| VPX_VBR, /**< Variable Bit Rate (VBR) mode */ |
| VPX_CBR /**< Constant Bit Rate (CBR) 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 VPX_KF_FIXED meant keyframes were disabled. |
| * This name is confusing for this behavior, so the new symbols to be used |
| * are VPX_KF_AUTO and VPX_KF_DISABLED. |
| */ |
| enum vpx_kf_mode |
| { |
| VPX_KF_FIXED, /**< deprecated, implies VPX_KF_DISABLED */ |
| VPX_KF_AUTO, /**< Encoder determines optimal placement automatically */ |
| VPX_KF_DISABLED = 0 /**< Encoder does not place keyframes. */ |
| }; |
| |
| |
| /*!\brief Encoded Frame Flags |
| * |
| * This type indicates a bitfield to be passed to vpx_codec_encode(), defining |
| * per-frame boolean values. By convention, bits common to all codecs will be |
| * named VPX_EFLAG_*, and bits specific to an algorithm will be named |
| * /algo/_eflag_*. The lower order 16 bits are reserved for common use. |
| */ |
| typedef long vpx_enc_frame_flags_t; |
| #define VPX_EFLAG_FORCE_KF (1<<0) /**< Force this frame to be a keyframe */ |
| |
| |
| /*!\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 vpx_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 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 vpx_rational g_timebase; |
| |
| |
| /*!\brief Enable error resilient mode. |
| * |
| * Error resilient mode indicates to the encoder that it should take |
| * measures appropriate for streaming over lossy or noisy links, if |
| * possible. Set to 1 to enable this feature, 0 to disable it. |
| */ |
| unsigned int 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 #VPX_RC_ONE_PASS. |
| */ |
| enum vpx_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 vpx VPx 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 Enable/disable 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 encoder 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_allowed; |
| |
| |
| /*!\brief Spatial resampling up watermark. |
| * |
| * This threshold is described as a percentage of the target data buffer. |
| * When the data buffer rises above this percentage of fullness, the |
| * encoder will step up to a higher resolution version of the frame. |
| */ |
| unsigned int rc_resize_up_thresh; |
| |
| |
| /*!\brief Spatial resampling down watermark. |
| * |
| * This threshold is described as a percentage of the target data buffer. |
| * When the data buffer falls below this percentage of fullness, the |
| * encoder will step down to a lower resolution version of the frame. |
| */ |
| unsigned int rc_resize_down_thresh; |
| |
| |
| /*!\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 vpx_rc_mode rc_end_usage; |
| |
| |
| /*!\brief Two-pass stats buffer. |
| * |
| * A buffer containing all of the stats packets produced in the first |
| * pass, concatenated. |
| */ |
| struct vpx_fixed_buf rc_twopass_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 |
| * vpx_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 |
| * vpx_codec_enc_config_default() with a usage value of 0. |
| */ |
| unsigned int rc_max_quantizer; |
| |
| |
| /* |
| * bitrate tolerance |
| */ |
| |
| |
| /*!\brief Rate control undershoot tolerance |
| * |
| * This value, expressed as a percentage of the target bitrate, describes |
| * the target bitrate for easier frames, allowing bits to be saved for |
| * harder frames. Set to zero to use the codec default. |
| */ |
| unsigned int rc_undershoot_pct; |
| |
| |
| /*!\brief Rate control overshoot tolerance |
| * |
| * This value, expressed as a percentage of the target bitrate, describes |
| * the maximum allowed bitrate for a given frame. Set to zero to use the |
| * codec default. |
| */ |
| 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; /**< RC mode bias between CBR and VBR(0-100: 0->CBR, 100->VBR) */ |
| |
| |
| /*!\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 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 vpx_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; |
| |
| } vpx_codec_enc_cfg_t; /**< alias for struct vpx_codec_enc_cfg */ |
| |
| |
| /*!\brief Initialize an encoder instance |
| * |
| * Initializes a encoder context using the given interface. Applications |
| * should call the vpx_codec_enc_init convenience macro instead of this |
| * function directly, to ensure that the ABI version number parameter |
| * is properly initialized. |
| * |
| * In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags |
| * parameter), the storage pointed to by the cfg parameter must be |
| * kept readable and stable until all memory maps have been set. |
| * |
| * \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. May be NULL. |
| * \param[in] flags Bitfield of VPX_CODEC_USE_* flags |
| * \param[in] ver ABI version number. Must be set to |
| * VPX_ENCODER_ABI_VERSION |
| * \retval #VPX_CODEC_OK |
| * The decoder algorithm initialized. |
| * \retval #VPX_CODEC_MEM_ERROR |
| * Memory allocation failed. |
| */ |
| vpx_codec_err_t vpx_codec_enc_init_ver(vpx_codec_ctx_t *ctx, |
| vpx_codec_iface_t *iface, |
| vpx_codec_enc_cfg_t *cfg, |
| vpx_codec_flags_t flags, |
| int ver); |
| |
| |
| /*!\brief Convenience macro for vpx_codec_enc_init_ver() |
| * |
| * Ensures the ABI version parameter is properly set. |
| */ |
| #define vpx_codec_enc_init(ctx, iface, cfg, flags) \ |
| vpx_codec_enc_init_ver(ctx, iface, cfg, flags, VPX_ENCODER_ABI_VERSION) |
| |
| |
| /*!\brief Get a default configuration |
| * |
| * Initializes a 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 End usage. Set to 0 or use codec specific values. |
| * |
| * \retval #VPX_CODEC_OK |
| * The configuration was populated. |
| * \retval #VPX_CODEC_INCAPABLE |
| * Interface is not an encoder interface. |
| * \retval #VPX_CODEC_INVALID_PARAM |
| * A parameter was NULL, or the usage value was not recognized. |
| */ |
| vpx_codec_err_t vpx_codec_enc_config_default(vpx_codec_iface_t *iface, |
| vpx_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 #VPX_CODEC_OK |
| * The configuration was populated. |
| * \retval #VPX_CODEC_INCAPABLE |
| * Interface is not an encoder interface. |
| * \retval #VPX_CODEC_INVALID_PARAM |
| * A parameter was NULL, or the usage value was not recognized. |
| */ |
| vpx_codec_err_t vpx_codec_enc_config_set(vpx_codec_ctx_t *ctx, |
| const vpx_codec_enc_cfg_t *cfg); |
| |
| |
| /*!\brief Get global stream headers |
| * |
| * Retrieves a stream level global header packet, if supported by the codec. |
| * |
| * \param[in] ctx Pointer to this instance's context |
| * |
| * \retval NULL |
| * Encoder does not support global header |
| * \retval Non-NULL |
| * Pointer to buffer containing global header packet |
| */ |
| vpx_fixed_buf_t *vpx_codec_get_global_headers(vpx_codec_ctx_t *ctx); |
| |
| |
| #define VPX_DL_REALTIME (1) /**< deadline parameter analogous to |
| * VPx REALTIME mode. */ |
| #define VPX_DL_GOOD_QUALITY (1000000) /**< deadline parameter analogous to |
| * VPx GOOD QUALITY mode. */ |
| #define VPX_DL_BEST_QUALITY (0) /**< deadline parameter analogous to |
| * VPx BEST QUALITY mode. */ |
| /*!\brief Encode a frame |
| * |
| * Encodes a video frame at the given "presentation time." The presentation |
| * time stamp (PTS) \ref MUST be strictly increasing. |
| * |
| * The encoder supports the notion of a soft real-time deadline. Given a |
| * non-zero value to the deadline parameter, the encoder will make a "best |
| * effort" guarantee to return before the given time slice expires. It is |
| * implicit that limiting the available time to encode will degrade the |
| * output quality. The encoder can be given an unlimited time to produce the |
| * best possible frame by specifying a deadline of '0'. This deadline |
| * supercedes the VPx notion of "best quality, good quality, realtime". |
| * Applications that wish to map these former settings to the new deadline |
| * based system can use the symbols #VPX_DL_REALTIME, #VPX_DL_GOOD_QUALITY, |
| * and #VPX_DL_BEST_QUALITY. |
| * |
| * When the last frame has been passed to the encoder, this function should |
| * continue to be called, 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 vpx_codec_encode() is called |
| * and vpx_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. |
| * \param[in] duration Duration to show frame, in timebase units. |
| * \param[in] flags Flags to use for encoding this frame. |
| * \param[in] deadline Time to spend encoding, in microseconds. (0=infinite) |
| * |
| * \retval #VPX_CODEC_OK |
| * The configuration was populated. |
| * \retval #VPX_CODEC_INCAPABLE |
| * Interface is not an encoder interface. |
| * \retval #VPX_CODEC_INVALID_PARAM |
| * A parameter was NULL, the image format is unsupported, etc. |
| */ |
| vpx_codec_err_t vpx_codec_encode(vpx_codec_ctx_t *ctx, |
| const vpx_image_t *img, |
| vpx_codec_pts_t pts, |
| unsigned long duration, |
| vpx_enc_frame_flags_t flags, |
| unsigned long deadline); |
| |
| |
| /*!\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 VPX_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 |
| * vpx_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 #VPX_CODEC_OK |
| * The buffer was set successfully. |
| * \retval #VPX_CODEC_INVALID_PARAM |
| * A parameter was NULL, the image format is unsupported, etc. |
| */ |
| vpx_codec_err_t vpx_codec_set_cx_data_buf(vpx_codec_ctx_t *ctx, |
| const vpx_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 |
| * #vpx_codec_cx_pkt_kind. |
| * |
| * #VPX_CODEC_CX_FRAME_PKT packets should be passed to the application's |
| * muxer. Multiple compressed frames may be in the list. |
| * #VPX_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 vpx_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 vpx_codec_cx_pkt_t *vpx_codec_get_cx_data(vpx_codec_ctx_t *ctx, |
| vpx_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 vpx_image_t *vpx_codec_get_preview_frame(vpx_codec_ctx_t *ctx); |
| |
| |
| /*!@} - end defgroup encoder*/ |
| |
| #endif |
| #ifdef __cplusplus |
| } |
| #endif |
