1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 #ifndef VPX_VPX_ENCODER_H_ 11 #define VPX_VPX_ENCODER_H_ 12 13 /*!\defgroup encoder Encoder Algorithm Interface 14 * \ingroup codec 15 * This abstraction allows applications using this encoder to easily support 16 * multiple video formats with minimal code duplication. This section describes 17 * the interface common to all encoders. 18 * @{ 19 */ 20 21 /*!\file 22 * \brief Describes the encoder algorithm interface to applications. 23 * 24 * This file describes the interface between an application and a 25 * video encoder algorithm. 26 * 27 */ 28 #ifdef __cplusplus 29 extern "C" { 30 #endif 31 32 #include "./vpx_codec.h" 33 34 /*! Temporal Scalability: Maximum length of the sequence defining frame 35 * layer membership 36 */ 37 #define VPX_TS_MAX_PERIODICITY 16 38 39 /*! Temporal Scalability: Maximum number of coding layers */ 40 #define VPX_TS_MAX_LAYERS 5 41 42 /*!\deprecated Use #VPX_TS_MAX_PERIODICITY instead. */ 43 #define MAX_PERIODICITY VPX_TS_MAX_PERIODICITY 44 45 /*!\deprecated Use #VPX_TS_MAX_LAYERS instead. */ 46 #define MAX_LAYERS VPX_TS_MAX_LAYERS 47 48 /*! Spatial Scalability: Maximum number of coding layers */ 49 #define VPX_SS_MAX_LAYERS 5 50 51 /*! Spatial Scalability: Default number of coding layers */ 52 #define VPX_SS_DEFAULT_LAYERS 1 53 54 /*!\brief Current ABI version number 55 * 56 * \internal 57 * If this file is altered in any way that changes the ABI, this value 58 * must be bumped. Examples include, but are not limited to, changing 59 * types, removing or reassigning enums, adding/removing/rearranging 60 * fields to structures 61 */ 62 #define VPX_ENCODER_ABI_VERSION (3 + VPX_CODEC_ABI_VERSION) /**<\hideinitializer*/ 63 64 65 /*! \brief Encoder capabilities bitfield 66 * 67 * Each encoder advertises the capabilities it supports as part of its 68 * ::vpx_codec_iface_t interface structure. Capabilities are extra 69 * interfaces or functionality, and are not required to be supported 70 * by an encoder. 71 * 72 * The available flags are specified by VPX_CODEC_CAP_* defines. 73 */ 74 #define VPX_CODEC_CAP_PSNR 0x10000 /**< Can issue PSNR packets */ 75 76 /*! Can output one partition at a time. Each partition is returned in its 77 * own VPX_CODEC_CX_FRAME_PKT, with the FRAME_IS_FRAGMENT flag set for 78 * every partition but the last. In this mode all frames are always 79 * returned partition by partition. 80 */ 81 #define VPX_CODEC_CAP_OUTPUT_PARTITION 0x20000 82 83 84 /*! \brief Initialization-time Feature Enabling 85 * 86 * Certain codec features must be known at initialization time, to allow 87 * for proper memory allocation. 88 * 89 * The available flags are specified by VPX_CODEC_USE_* defines. 90 */ 91 #define VPX_CODEC_USE_PSNR 0x10000 /**< Calculate PSNR on each frame */ 92 #define VPX_CODEC_USE_OUTPUT_PARTITION 0x20000 /**< Make the encoder output one 93 partition at a time. */ 94 95 96 /*!\brief Generic fixed size buffer structure 97 * 98 * This structure is able to hold a reference to any fixed size buffer. 99 */ 100 typedef struct vpx_fixed_buf { 101 void *buf; /**< Pointer to the data */ 102 size_t sz; /**< Length of the buffer, in chars */ 103 } vpx_fixed_buf_t; /**< alias for struct vpx_fixed_buf */ 104 105 106 /*!\brief Time Stamp Type 107 * 108 * An integer, which when multiplied by the stream's time base, provides 109 * the absolute time of a sample. 110 */ 111 typedef int64_t vpx_codec_pts_t; 112 113 114 /*!\brief Compressed Frame Flags 115 * 116 * This type represents a bitfield containing information about a compressed 117 * frame that may be useful to an application. The most significant 16 bits 118 * can be used by an algorithm to provide additional detail, for example to 119 * support frame types that are codec specific (MPEG-1 D-frames for example) 120 */ 121 typedef uint32_t vpx_codec_frame_flags_t; 122 #define VPX_FRAME_IS_KEY 0x1 /**< frame is the start of a GOP */ 123 #define VPX_FRAME_IS_DROPPABLE 0x2 /**< frame can be dropped without affecting 124 the stream (no future frame depends on 125 this one) */ 126 #define VPX_FRAME_IS_INVISIBLE 0x4 /**< frame should be decoded but will not 127 be shown */ 128 #define VPX_FRAME_IS_FRAGMENT 0x8 /**< this is a fragment of the encoded 129 frame */ 130 131 /*!\brief Error Resilient flags 132 * 133 * These flags define which error resilient features to enable in the 134 * encoder. The flags are specified through the 135 * vpx_codec_enc_cfg::g_error_resilient variable. 136 */ 137 typedef uint32_t vpx_codec_er_flags_t; 138 #define VPX_ERROR_RESILIENT_DEFAULT 0x1 /**< Improve resiliency against 139 losses of whole frames */ 140 #define VPX_ERROR_RESILIENT_PARTITIONS 0x2 /**< The frame partitions are 141 independently decodable by the 142 bool decoder, meaning that 143 partitions can be decoded even 144 though earlier partitions have 145 been lost. Note that intra 146 predicition is still done over 147 the partition boundary. */ 148 149 /*!\brief Encoder output packet variants 150 * 151 * This enumeration lists the different kinds of data packets that can be 152 * returned by calls to vpx_codec_get_cx_data(). Algorithms \ref MAY 153 * extend this list to provide additional functionality. 154 */ 155 enum vpx_codec_cx_pkt_kind { 156 VPX_CODEC_CX_FRAME_PKT, /**< Compressed video frame */ 157 VPX_CODEC_STATS_PKT, /**< Two-pass statistics for this frame */ 158 VPX_CODEC_PSNR_PKT, /**< PSNR statistics for this frame */ 159 VPX_CODEC_CUSTOM_PKT = 256 /**< Algorithm extensions */ 160 }; 161 162 163 /*!\brief Encoder output packet 164 * 165 * This structure contains the different kinds of output data the encoder 166 * may produce while compressing a frame. 167 */ 168 typedef struct vpx_codec_cx_pkt { 169 enum vpx_codec_cx_pkt_kind kind; /**< packet variant */ 170 union { 171 struct { 172 void *buf; /**< compressed data buffer */ 173 size_t sz; /**< length of compressed data */ 174 vpx_codec_pts_t pts; /**< time stamp to show frame 175 (in timebase units) */ 176 unsigned long duration; /**< duration to show frame 177 (in timebase units) */ 178 vpx_codec_frame_flags_t flags; /**< flags for this frame */ 179 int partition_id; /**< the partition id 180 defines the decoding order 181 of the partitions. Only 182 applicable when "output partition" 183 mode is enabled. First partition 184 has id 0.*/ 185 186 } frame; /**< data for compressed frame packet */ 187 struct vpx_fixed_buf twopass_stats; /**< data for two-pass packet */ 188 struct vpx_psnr_pkt { 189 unsigned int samples[4]; /**< Number of samples, total/y/u/v */ 190 uint64_t sse[4]; /**< sum squared error, total/y/u/v */ 191 double psnr[4]; /**< PSNR, total/y/u/v */ 192 } psnr; /**< data for PSNR packet */ 193 struct vpx_fixed_buf raw; /**< data for arbitrary packets */ 194 195 /* This packet size is fixed to allow codecs to extend this 196 * interface without having to manage storage for raw packets, 197 * i.e., if it's smaller than 128 bytes, you can store in the 198 * packet list directly. 199 */ 200 char pad[128 - sizeof(enum vpx_codec_cx_pkt_kind)]; /**< fixed sz */ 201 } data; /**< packet data */ 202 } vpx_codec_cx_pkt_t; /**< alias for struct vpx_codec_cx_pkt */ 203 204 205 /*!\brief Rational Number 206 * 207 * This structure holds a fractional value. 208 */ 209 typedef struct vpx_rational { 210 int num; /**< fraction numerator */ 211 int den; /**< fraction denominator */ 212 } vpx_rational_t; /**< alias for struct vpx_rational */ 213 214 215 /*!\brief Multi-pass Encoding Pass */ 216 enum vpx_enc_pass { 217 VPX_RC_ONE_PASS, /**< Single pass mode */ 218 VPX_RC_FIRST_PASS, /**< First pass of multi-pass mode */ 219 VPX_RC_LAST_PASS /**< Final pass of multi-pass mode */ 220 }; 221 222 223 /*!\brief Rate control mode */ 224 enum vpx_rc_mode { 225 VPX_VBR, /**< Variable Bit Rate (VBR) mode */ 226 VPX_CBR, /**< Constant Bit Rate (CBR) mode */ 227 VPX_CQ, /**< Constrained Quality (CQ) mode */ 228 VPX_Q, /**< Constant Quality (Q) mode */ 229 }; 230 231 232 /*!\brief Keyframe placement mode. 233 * 234 * This enumeration determines whether keyframes are placed automatically by 235 * the encoder or whether this behavior is disabled. Older releases of this 236 * SDK were implemented such that VPX_KF_FIXED meant keyframes were disabled. 237 * This name is confusing for this behavior, so the new symbols to be used 238 * are VPX_KF_AUTO and VPX_KF_DISABLED. 239 */ 240 enum vpx_kf_mode { 241 VPX_KF_FIXED, /**< deprecated, implies VPX_KF_DISABLED */ 242 VPX_KF_AUTO, /**< Encoder determines optimal placement automatically */ 243 VPX_KF_DISABLED = 0 /**< Encoder does not place keyframes. */ 244 }; 245 246 247 /*!\brief Encoded Frame Flags 248 * 249 * This type indicates a bitfield to be passed to vpx_codec_encode(), defining 250 * per-frame boolean values. By convention, bits common to all codecs will be 251 * named VPX_EFLAG_*, and bits specific to an algorithm will be named 252 * /algo/_eflag_*. The lower order 16 bits are reserved for common use. 253 */ 254 typedef long vpx_enc_frame_flags_t; 255 #define VPX_EFLAG_FORCE_KF (1<<0) /**< Force this frame to be a keyframe */ 256 257 258 /*!\brief Encoder configuration structure 259 * 260 * This structure contains the encoder settings that have common representations 261 * across all codecs. This doesn't imply that all codecs support all features, 262 * however. 263 */ 264 typedef struct vpx_codec_enc_cfg { 265 /* 266 * generic settings (g) 267 */ 268 269 /*!\brief Algorithm specific "usage" value 270 * 271 * Algorithms may define multiple values for usage, which may convey the 272 * intent of how the application intends to use the stream. If this value 273 * is non-zero, consult the documentation for the codec to determine its 274 * meaning. 275 */ 276 unsigned int g_usage; 277 278 279 /*!\brief Maximum number of threads to use 280 * 281 * For multi-threaded implementations, use no more than this number of 282 * threads. The codec may use fewer threads than allowed. The value 283 * 0 is equivalent to the value 1. 284 */ 285 unsigned int g_threads; 286 287 288 /*!\brief Bitstream profile to use 289 * 290 * Some codecs support a notion of multiple bitstream profiles. Typically 291 * this maps to a set of features that are turned on or off. Often the 292 * profile to use is determined by the features of the intended decoder. 293 * Consult the documentation for the codec to determine the valid values 294 * for this parameter, or set to zero for a sane default. 295 */ 296 unsigned int g_profile; /**< profile of bitstream to use */ 297 298 299 300 /*!\brief Width of the frame 301 * 302 * This value identifies the presentation resolution of the frame, 303 * in pixels. Note that the frames passed as input to the encoder must 304 * have this resolution. Frames will be presented by the decoder in this 305 * resolution, independent of any spatial resampling the encoder may do. 306 */ 307 unsigned int g_w; 308 309 310 /*!\brief Height of the frame 311 * 312 * This value identifies the presentation resolution of the frame, 313 * in pixels. Note that the frames passed as input to the encoder must 314 * have this resolution. Frames will be presented by the decoder in this 315 * resolution, independent of any spatial resampling the encoder may do. 316 */ 317 unsigned int g_h; 318 319 320 /*!\brief Stream timebase units 321 * 322 * Indicates the smallest interval of time, in seconds, used by the stream. 323 * For fixed frame rate material, or variable frame rate material where 324 * frames are timed at a multiple of a given clock (ex: video capture), 325 * the \ref RECOMMENDED method is to set the timebase to the reciprocal 326 * of the frame rate (ex: 1001/30000 for 29.970 Hz NTSC). This allows the 327 * pts to correspond to the frame number, which can be handy. For 328 * re-encoding video from containers with absolute time timestamps, the 329 * \ref RECOMMENDED method is to set the timebase to that of the parent 330 * container or multimedia framework (ex: 1/1000 for ms, as in FLV). 331 */ 332 struct vpx_rational g_timebase; 333 334 335 /*!\brief Enable error resilient modes. 336 * 337 * The error resilient bitfield indicates to the encoder which features 338 * it should enable to take measures for streaming over lossy or noisy 339 * links. 340 */ 341 vpx_codec_er_flags_t g_error_resilient; 342 343 344 /*!\brief Multi-pass Encoding Mode 345 * 346 * This value should be set to the current phase for multi-pass encoding. 347 * For single pass, set to #VPX_RC_ONE_PASS. 348 */ 349 enum vpx_enc_pass g_pass; 350 351 352 /*!\brief Allow lagged encoding 353 * 354 * If set, this value allows the encoder to consume a number of input 355 * frames before producing output frames. This allows the encoder to 356 * base decisions for the current frame on future frames. This does 357 * increase the latency of the encoding pipeline, so it is not appropriate 358 * in all situations (ex: realtime encoding). 359 * 360 * Note that this is a maximum value -- the encoder may produce frames 361 * sooner than the given limit. Set this value to 0 to disable this 362 * feature. 363 */ 364 unsigned int g_lag_in_frames; 365 366 367 /* 368 * rate control settings (rc) 369 */ 370 371 /*!\brief Temporal resampling configuration, if supported by the codec. 372 * 373 * Temporal resampling allows the codec to "drop" frames as a strategy to 374 * meet its target data rate. This can cause temporal discontinuities in 375 * the encoded video, which may appear as stuttering during playback. This 376 * trade-off is often acceptable, but for many applications is not. It can 377 * be disabled in these cases. 378 * 379 * Note that not all codecs support this feature. All vpx VPx codecs do. 380 * For other codecs, consult the documentation for that algorithm. 381 * 382 * This threshold is described as a percentage of the target data buffer. 383 * When the data buffer falls below this percentage of fullness, a 384 * dropped frame is indicated. Set the threshold to zero (0) to disable 385 * this feature. 386 */ 387 unsigned int rc_dropframe_thresh; 388 389 390 /*!\brief Enable/disable spatial resampling, if supported by the codec. 391 * 392 * Spatial resampling allows the codec to compress a lower resolution 393 * version of the frame, which is then upscaled by the encoder to the 394 * correct presentation resolution. This increases visual quality at 395 * low data rates, at the expense of CPU time on the encoder/decoder. 396 */ 397 unsigned int rc_resize_allowed; 398 399 /*!\brief Internal coded frame width. 400 * 401 * If spatial resampling is enabled this specifies the width of the 402 * encoded frame. 403 */ 404 unsigned int rc_scaled_width; 405 406 /*!\brief Internal coded frame height. 407 * 408 * If spatial resampling is enabled this specifies the height of the 409 * encoded frame. 410 */ 411 unsigned int rc_scaled_height; 412 413 /*!\brief Spatial resampling up watermark. 414 * 415 * This threshold is described as a percentage of the target data buffer. 416 * When the data buffer rises above this percentage of fullness, the 417 * encoder will step up to a higher resolution version of the frame. 418 */ 419 unsigned int rc_resize_up_thresh; 420 421 422 /*!\brief Spatial resampling down watermark. 423 * 424 * This threshold is described as a percentage of the target data buffer. 425 * When the data buffer falls below this percentage of fullness, the 426 * encoder will step down to a lower resolution version of the frame. 427 */ 428 unsigned int rc_resize_down_thresh; 429 430 431 /*!\brief Rate control algorithm to use. 432 * 433 * Indicates whether the end usage of this stream is to be streamed over 434 * a bandwidth constrained link, indicating that Constant Bit Rate (CBR) 435 * mode should be used, or whether it will be played back on a high 436 * bandwidth link, as from a local disk, where higher variations in 437 * bitrate are acceptable. 438 */ 439 enum vpx_rc_mode rc_end_usage; 440 441 442 /*!\brief Two-pass stats buffer. 443 * 444 * A buffer containing all of the stats packets produced in the first 445 * pass, concatenated. 446 */ 447 struct vpx_fixed_buf rc_twopass_stats_in; 448 449 450 /*!\brief Target data rate 451 * 452 * Target bandwidth to use for this stream, in kilobits per second. 453 */ 454 unsigned int rc_target_bitrate; 455 456 457 /* 458 * quantizer settings 459 */ 460 461 462 /*!\brief Minimum (Best Quality) Quantizer 463 * 464 * The quantizer is the most direct control over the quality of the 465 * encoded image. The range of valid values for the quantizer is codec 466 * specific. Consult the documentation for the codec to determine the 467 * values to use. To determine the range programmatically, call 468 * vpx_codec_enc_config_default() with a usage value of 0. 469 */ 470 unsigned int rc_min_quantizer; 471 472 473 /*!\brief Maximum (Worst Quality) Quantizer 474 * 475 * The quantizer is the most direct control over the quality of the 476 * encoded image. The range of valid values for the quantizer is codec 477 * specific. Consult the documentation for the codec to determine the 478 * values to use. To determine the range programmatically, call 479 * vpx_codec_enc_config_default() with a usage value of 0. 480 */ 481 unsigned int rc_max_quantizer; 482 483 484 /* 485 * bitrate tolerance 486 */ 487 488 489 /*!\brief Rate control adaptation undershoot control 490 * 491 * This value, expressed as a percentage of the target bitrate, 492 * controls the maximum allowed adaptation speed of the codec. 493 * This factor controls the maximum amount of bits that can 494 * be subtracted from the target bitrate in order to compensate 495 * for prior overshoot. 496 * 497 * Valid values in the range 0-1000. 498 */ 499 unsigned int rc_undershoot_pct; 500 501 502 /*!\brief Rate control adaptation overshoot control 503 * 504 * This value, expressed as a percentage of the target bitrate, 505 * controls the maximum allowed adaptation speed of the codec. 506 * This factor controls the maximum amount of bits that can 507 * be added to the target bitrate in order to compensate for 508 * prior undershoot. 509 * 510 * Valid values in the range 0-1000. 511 */ 512 unsigned int rc_overshoot_pct; 513 514 515 /* 516 * decoder buffer model parameters 517 */ 518 519 520 /*!\brief Decoder Buffer Size 521 * 522 * This value indicates the amount of data that may be buffered by the 523 * decoding application. Note that this value is expressed in units of 524 * time (milliseconds). For example, a value of 5000 indicates that the 525 * client will buffer (at least) 5000ms worth of encoded data. Use the 526 * target bitrate (#rc_target_bitrate) to convert to bits/bytes, if 527 * necessary. 528 */ 529 unsigned int rc_buf_sz; 530 531 532 /*!\brief Decoder Buffer Initial Size 533 * 534 * This value indicates the amount of data that will be buffered by the 535 * decoding application prior to beginning playback. This value is 536 * expressed in units of time (milliseconds). Use the target bitrate 537 * (#rc_target_bitrate) to convert to bits/bytes, if necessary. 538 */ 539 unsigned int rc_buf_initial_sz; 540 541 542 /*!\brief Decoder Buffer Optimal Size 543 * 544 * This value indicates the amount of data that the encoder should try 545 * to maintain in the decoder's buffer. This value is expressed in units 546 * of time (milliseconds). Use the target bitrate (#rc_target_bitrate) 547 * to convert to bits/bytes, if necessary. 548 */ 549 unsigned int rc_buf_optimal_sz; 550 551 552 /* 553 * 2 pass rate control parameters 554 */ 555 556 557 /*!\brief Two-pass mode CBR/VBR bias 558 * 559 * Bias, expressed on a scale of 0 to 100, for determining target size 560 * for the current frame. The value 0 indicates the optimal CBR mode 561 * value should be used. The value 100 indicates the optimal VBR mode 562 * value should be used. Values in between indicate which way the 563 * encoder should "lean." 564 */ 565 unsigned int rc_2pass_vbr_bias_pct; /**< RC mode bias between CBR and VBR(0-100: 0->CBR, 100->VBR) */ 566 567 568 /*!\brief Two-pass mode per-GOP minimum bitrate 569 * 570 * This value, expressed as a percentage of the target bitrate, indicates 571 * the minimum bitrate to be used for a single GOP (aka "section") 572 */ 573 unsigned int rc_2pass_vbr_minsection_pct; 574 575 576 /*!\brief Two-pass mode per-GOP maximum bitrate 577 * 578 * This value, expressed as a percentage of the target bitrate, indicates 579 * the maximum bitrate to be used for a single GOP (aka "section") 580 */ 581 unsigned int rc_2pass_vbr_maxsection_pct; 582 583 584 /* 585 * keyframing settings (kf) 586 */ 587 588 /*!\brief Keyframe placement mode 589 * 590 * This value indicates whether the encoder should place keyframes at a 591 * fixed interval, or determine the optimal placement automatically 592 * (as governed by the #kf_min_dist and #kf_max_dist parameters) 593 */ 594 enum vpx_kf_mode kf_mode; 595 596 597 /*!\brief Keyframe minimum interval 598 * 599 * This value, expressed as a number of frames, prevents the encoder from 600 * placing a keyframe nearer than kf_min_dist to the previous keyframe. At 601 * least kf_min_dist frames non-keyframes will be coded before the next 602 * keyframe. Set kf_min_dist equal to kf_max_dist for a fixed interval. 603 */ 604 unsigned int kf_min_dist; 605 606 607 /*!\brief Keyframe maximum interval 608 * 609 * This value, expressed as a number of frames, forces the encoder to code 610 * a keyframe if one has not been coded in the last kf_max_dist frames. 611 * A value of 0 implies all frames will be keyframes. Set kf_min_dist 612 * equal to kf_max_dist for a fixed interval. 613 */ 614 unsigned int kf_max_dist; 615 616 /* 617 * Spatial scalability settings (ss) 618 */ 619 620 /*!\brief Number of spatial coding layers. 621 * 622 * This value specifies the number of spatial coding layers to be used. 623 */ 624 unsigned int ss_number_layers; 625 626 /*!\brief Target bitrate for each spatial layer. 627 * 628 * These values specify the target coding bitrate to be used for each 629 * spatial layer. 630 */ 631 unsigned int ss_target_bitrate[VPX_SS_MAX_LAYERS]; 632 633 /*!\brief Number of temporal coding layers. 634 * 635 * This value specifies the number of temporal layers to be used. 636 */ 637 unsigned int ts_number_layers; 638 639 /*!\brief Target bitrate for each temporal layer. 640 * 641 * These values specify the target coding bitrate to be used for each 642 * temporal layer. 643 */ 644 unsigned int ts_target_bitrate[VPX_TS_MAX_LAYERS]; 645 646 /*!\brief Frame rate decimation factor for each temporal layer. 647 * 648 * These values specify the frame rate decimation factors to apply 649 * to each temporal layer. 650 */ 651 unsigned int ts_rate_decimator[VPX_TS_MAX_LAYERS]; 652 653 /*!\brief Length of the sequence defining frame temporal layer membership. 654 * 655 * This value specifies the length of the sequence that defines the 656 * membership of frames to temporal layers. For example, if the 657 * ts_periodicity = 8, then the frames are assigned to coding layers with a 658 * repeated sequence of length 8. 659 */ 660 unsigned int ts_periodicity; 661 662 /*!\brief Template defining the membership of frames to temporal layers. 663 * 664 * This array defines the membership of frames to temporal coding layers. 665 * For a 2-layer encoding that assigns even numbered frames to one temporal 666 * layer (0) and odd numbered frames to a second temporal layer (1) with 667 * ts_periodicity=8, then ts_layer_id = (0,1,0,1,0,1,0,1). 668 */ 669 unsigned int ts_layer_id[VPX_TS_MAX_PERIODICITY]; 670 } vpx_codec_enc_cfg_t; /**< alias for struct vpx_codec_enc_cfg */ 671 672 673 /*!\brief Initialize an encoder instance 674 * 675 * Initializes a encoder context using the given interface. Applications 676 * should call the vpx_codec_enc_init convenience macro instead of this 677 * function directly, to ensure that the ABI version number parameter 678 * is properly initialized. 679 * 680 * If the library was configured with --disable-multithread, this call 681 * is not thread safe and should be guarded with a lock if being used 682 * in a multithreaded context. 683 * 684 * In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags 685 * parameter), the storage pointed to by the cfg parameter must be 686 * kept readable and stable until all memory maps have been set. 687 * 688 * \param[in] ctx Pointer to this instance's context. 689 * \param[in] iface Pointer to the algorithm interface to use. 690 * \param[in] cfg Configuration to use, if known. May be NULL. 691 * \param[in] flags Bitfield of VPX_CODEC_USE_* flags 692 * \param[in] ver ABI version number. Must be set to 693 * VPX_ENCODER_ABI_VERSION 694 * \retval #VPX_CODEC_OK 695 * The decoder algorithm initialized. 696 * \retval #VPX_CODEC_MEM_ERROR 697 * Memory allocation failed. 698 */ 699 vpx_codec_err_t vpx_codec_enc_init_ver(vpx_codec_ctx_t *ctx, 700 vpx_codec_iface_t *iface, 701 vpx_codec_enc_cfg_t *cfg, 702 vpx_codec_flags_t flags, 703 int ver); 704 705 706 /*!\brief Convenience macro for vpx_codec_enc_init_ver() 707 * 708 * Ensures the ABI version parameter is properly set. 709 */ 710 #define vpx_codec_enc_init(ctx, iface, cfg, flags) \ 711 vpx_codec_enc_init_ver(ctx, iface, cfg, flags, VPX_ENCODER_ABI_VERSION) 712 713 714 /*!\brief Initialize multi-encoder instance 715 * 716 * Initializes multi-encoder context using the given interface. 717 * Applications should call the vpx_codec_enc_init_multi convenience macro 718 * instead of this function directly, to ensure that the ABI version number 719 * parameter is properly initialized. 720 * 721 * In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags 722 * parameter), the storage pointed to by the cfg parameter must be 723 * kept readable and stable until all memory maps have been set. 724 * 725 * \param[in] ctx Pointer to this instance's context. 726 * \param[in] iface Pointer to the algorithm interface to use. 727 * \param[in] cfg Configuration to use, if known. May be NULL. 728 * \param[in] num_enc Total number of encoders. 729 * \param[in] flags Bitfield of VPX_CODEC_USE_* flags 730 * \param[in] dsf Pointer to down-sampling factors. 731 * \param[in] ver ABI version number. Must be set to 732 * VPX_ENCODER_ABI_VERSION 733 * \retval #VPX_CODEC_OK 734 * The decoder algorithm initialized. 735 * \retval #VPX_CODEC_MEM_ERROR 736 * Memory allocation failed. 737 */ 738 vpx_codec_err_t vpx_codec_enc_init_multi_ver(vpx_codec_ctx_t *ctx, 739 vpx_codec_iface_t *iface, 740 vpx_codec_enc_cfg_t *cfg, 741 int num_enc, 742 vpx_codec_flags_t flags, 743 vpx_rational_t *dsf, 744 int ver); 745 746 747 /*!\brief Convenience macro for vpx_codec_enc_init_multi_ver() 748 * 749 * Ensures the ABI version parameter is properly set. 750 */ 751 #define vpx_codec_enc_init_multi(ctx, iface, cfg, num_enc, flags, dsf) \ 752 vpx_codec_enc_init_multi_ver(ctx, iface, cfg, num_enc, flags, dsf, \ 753 VPX_ENCODER_ABI_VERSION) 754 755 756 /*!\brief Get a default configuration 757 * 758 * Initializes a encoder configuration structure with default values. Supports 759 * the notion of "usages" so that an algorithm may offer different default 760 * settings depending on the user's intended goal. This function \ref SHOULD 761 * be called by all applications to initialize the configuration structure 762 * before specializing the configuration with application specific values. 763 * 764 * \param[in] iface Pointer to the algorithm interface to use. 765 * \param[out] cfg Configuration buffer to populate 766 * \param[in] usage End usage. Set to 0 or use codec specific values. 767 * 768 * \retval #VPX_CODEC_OK 769 * The configuration was populated. 770 * \retval #VPX_CODEC_INCAPABLE 771 * Interface is not an encoder interface. 772 * \retval #VPX_CODEC_INVALID_PARAM 773 * A parameter was NULL, or the usage value was not recognized. 774 */ 775 vpx_codec_err_t vpx_codec_enc_config_default(vpx_codec_iface_t *iface, 776 vpx_codec_enc_cfg_t *cfg, 777 unsigned int usage); 778 779 780 /*!\brief Set or change configuration 781 * 782 * Reconfigures an encoder instance according to the given configuration. 783 * 784 * \param[in] ctx Pointer to this instance's context 785 * \param[in] cfg Configuration buffer to use 786 * 787 * \retval #VPX_CODEC_OK 788 * The configuration was populated. 789 * \retval #VPX_CODEC_INCAPABLE 790 * Interface is not an encoder interface. 791 * \retval #VPX_CODEC_INVALID_PARAM 792 * A parameter was NULL, or the usage value was not recognized. 793 */ 794 vpx_codec_err_t vpx_codec_enc_config_set(vpx_codec_ctx_t *ctx, 795 const vpx_codec_enc_cfg_t *cfg); 796 797 798 /*!\brief Get global stream headers 799 * 800 * Retrieves a stream level global header packet, if supported by the codec. 801 * 802 * \param[in] ctx Pointer to this instance's context 803 * 804 * \retval NULL 805 * Encoder does not support global header 806 * \retval Non-NULL 807 * Pointer to buffer containing global header packet 808 */ 809 vpx_fixed_buf_t *vpx_codec_get_global_headers(vpx_codec_ctx_t *ctx); 810 811 812 #define VPX_DL_REALTIME (1) /**< deadline parameter analogous to 813 * VPx REALTIME mode. */ 814 #define VPX_DL_GOOD_QUALITY (1000000) /**< deadline parameter analogous to 815 * VPx GOOD QUALITY mode. */ 816 #define VPX_DL_BEST_QUALITY (0) /**< deadline parameter analogous to 817 * VPx BEST QUALITY mode. */ 818 /*!\brief Encode a frame 819 * 820 * Encodes a video frame at the given "presentation time." The presentation 821 * time stamp (PTS) \ref MUST be strictly increasing. 822 * 823 * The encoder supports the notion of a soft real-time deadline. Given a 824 * non-zero value to the deadline parameter, the encoder will make a "best 825 * effort" guarantee to return before the given time slice expires. It is 826 * implicit that limiting the available time to encode will degrade the 827 * output quality. The encoder can be given an unlimited time to produce the 828 * best possible frame by specifying a deadline of '0'. This deadline 829 * supercedes the VPx notion of "best quality, good quality, realtime". 830 * Applications that wish to map these former settings to the new deadline 831 * based system can use the symbols #VPX_DL_REALTIME, #VPX_DL_GOOD_QUALITY, 832 * and #VPX_DL_BEST_QUALITY. 833 * 834 * When the last frame has been passed to the encoder, this function should 835 * continue to be called, with the img parameter set to NULL. This will 836 * signal the end-of-stream condition to the encoder and allow it to encode 837 * any held buffers. Encoding is complete when vpx_codec_encode() is called 838 * and vpx_codec_get_cx_data() returns no data. 839 * 840 * \param[in] ctx Pointer to this instance's context 841 * \param[in] img Image data to encode, NULL to flush. 842 * \param[in] pts Presentation time stamp, in timebase units. 843 * \param[in] duration Duration to show frame, in timebase units. 844 * \param[in] flags Flags to use for encoding this frame. 845 * \param[in] deadline Time to spend encoding, in microseconds. (0=infinite) 846 * 847 * \retval #VPX_CODEC_OK 848 * The configuration was populated. 849 * \retval #VPX_CODEC_INCAPABLE 850 * Interface is not an encoder interface. 851 * \retval #VPX_CODEC_INVALID_PARAM 852 * A parameter was NULL, the image format is unsupported, etc. 853 */ 854 vpx_codec_err_t vpx_codec_encode(vpx_codec_ctx_t *ctx, 855 const vpx_image_t *img, 856 vpx_codec_pts_t pts, 857 unsigned long duration, 858 vpx_enc_frame_flags_t flags, 859 unsigned long deadline); 860 861 /*!\brief Set compressed data output buffer 862 * 863 * Sets the buffer that the codec should output the compressed data 864 * into. This call effectively sets the buffer pointer returned in the 865 * next VPX_CODEC_CX_FRAME_PKT packet. Subsequent packets will be 866 * appended into this buffer. The buffer is preserved across frames, 867 * so applications must periodically call this function after flushing 868 * the accumulated compressed data to disk or to the network to reset 869 * the pointer to the buffer's head. 870 * 871 * `pad_before` bytes will be skipped before writing the compressed 872 * data, and `pad_after` bytes will be appended to the packet. The size 873 * of the packet will be the sum of the size of the actual compressed 874 * data, pad_before, and pad_after. The padding bytes will be preserved 875 * (not overwritten). 876 * 877 * Note that calling this function does not guarantee that the returned 878 * compressed data will be placed into the specified buffer. In the 879 * event that the encoded data will not fit into the buffer provided, 880 * the returned packet \ref MAY point to an internal buffer, as it would 881 * if this call were never used. In this event, the output packet will 882 * NOT have any padding, and the application must free space and copy it 883 * to the proper place. This is of particular note in configurations 884 * that may output multiple packets for a single encoded frame (e.g., lagged 885 * encoding) or if the application does not reset the buffer periodically. 886 * 887 * Applications may restore the default behavior of the codec providing 888 * the compressed data buffer by calling this function with a NULL 889 * buffer. 890 * 891 * Applications \ref MUSTNOT call this function during iteration of 892 * vpx_codec_get_cx_data(). 893 * 894 * \param[in] ctx Pointer to this instance's context 895 * \param[in] buf Buffer to store compressed data into 896 * \param[in] pad_before Bytes to skip before writing compressed data 897 * \param[in] pad_after Bytes to skip after writing compressed data 898 * 899 * \retval #VPX_CODEC_OK 900 * The buffer was set successfully. 901 * \retval #VPX_CODEC_INVALID_PARAM 902 * A parameter was NULL, the image format is unsupported, etc. 903 */ 904 vpx_codec_err_t vpx_codec_set_cx_data_buf(vpx_codec_ctx_t *ctx, 905 const vpx_fixed_buf_t *buf, 906 unsigned int pad_before, 907 unsigned int pad_after); 908 909 910 /*!\brief Encoded data iterator 911 * 912 * Iterates over a list of data packets to be passed from the encoder to the 913 * application. The different kinds of packets available are enumerated in 914 * #vpx_codec_cx_pkt_kind. 915 * 916 * #VPX_CODEC_CX_FRAME_PKT packets should be passed to the application's 917 * muxer. Multiple compressed frames may be in the list. 918 * #VPX_CODEC_STATS_PKT packets should be appended to a global buffer. 919 * 920 * The application \ref MUST silently ignore any packet kinds that it does 921 * not recognize or support. 922 * 923 * The data buffers returned from this function are only guaranteed to be 924 * valid until the application makes another call to any vpx_codec_* function. 925 * 926 * \param[in] ctx Pointer to this instance's context 927 * \param[in,out] iter Iterator storage, initialized to NULL 928 * 929 * \return Returns a pointer to an output data packet (compressed frame data, 930 * two-pass statistics, etc.) or NULL to signal end-of-list. 931 * 932 */ 933 const vpx_codec_cx_pkt_t *vpx_codec_get_cx_data(vpx_codec_ctx_t *ctx, 934 vpx_codec_iter_t *iter); 935 936 937 /*!\brief Get Preview Frame 938 * 939 * Returns an image that can be used as a preview. Shows the image as it would 940 * exist at the decompressor. The application \ref MUST NOT write into this 941 * image buffer. 942 * 943 * \param[in] ctx Pointer to this instance's context 944 * 945 * \return Returns a pointer to a preview image, or NULL if no image is 946 * available. 947 * 948 */ 949 const vpx_image_t *vpx_codec_get_preview_frame(vpx_codec_ctx_t *ctx); 950 951 952 /*!@} - end defgroup encoder*/ 953 #ifdef __cplusplus 954 } 955 #endif 956 #endif // VPX_VPX_ENCODER_H_ 957 958