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 
400     /*!\brief Spatial resampling up watermark.
401      *
402      * This threshold is described as a percentage of the target data buffer.
403      * When the data buffer rises above this percentage of fullness, the
404      * encoder will step up to a higher resolution version of the frame.
405      */
406     unsigned int           rc_resize_up_thresh;
407 
408 
409     /*!\brief Spatial resampling down watermark.
410      *
411      * This threshold is described as a percentage of the target data buffer.
412      * When the data buffer falls below this percentage of fullness, the
413      * encoder will step down to a lower resolution version of the frame.
414      */
415     unsigned int           rc_resize_down_thresh;
416 
417 
418     /*!\brief Rate control algorithm to use.
419      *
420      * Indicates whether the end usage of this stream is to be streamed over
421      * a bandwidth constrained link, indicating that Constant Bit Rate (CBR)
422      * mode should be used, or whether it will be played back on a high
423      * bandwidth link, as from a local disk, where higher variations in
424      * bitrate are acceptable.
425      */
426     enum vpx_rc_mode       rc_end_usage;
427 
428 
429     /*!\brief Two-pass stats buffer.
430      *
431      * A buffer containing all of the stats packets produced in the first
432      * pass, concatenated.
433      */
434     struct vpx_fixed_buf   rc_twopass_stats_in;
435 
436 
437     /*!\brief Target data rate
438      *
439      * Target bandwidth to use for this stream, in kilobits per second.
440      */
441     unsigned int           rc_target_bitrate;
442 
443 
444     /*
445      * quantizer settings
446      */
447 
448 
449     /*!\brief Minimum (Best Quality) Quantizer
450      *
451      * The quantizer is the most direct control over the quality of the
452      * encoded image. The range of valid values for the quantizer is codec
453      * specific. Consult the documentation for the codec to determine the
454      * values to use. To determine the range programmatically, call
455      * vpx_codec_enc_config_default() with a usage value of 0.
456      */
457     unsigned int           rc_min_quantizer;
458 
459 
460     /*!\brief Maximum (Worst Quality) Quantizer
461      *
462      * The quantizer is the most direct control over the quality of the
463      * encoded image. The range of valid values for the quantizer is codec
464      * specific. Consult the documentation for the codec to determine the
465      * values to use. To determine the range programmatically, call
466      * vpx_codec_enc_config_default() with a usage value of 0.
467      */
468     unsigned int           rc_max_quantizer;
469 
470 
471     /*
472      * bitrate tolerance
473      */
474 
475 
476     /*!\brief Rate control adaptation undershoot control
477      *
478      * This value, expressed as a percentage of the target bitrate,
479      * controls the maximum allowed adaptation speed of the codec.
480      * This factor controls the maximum amount of bits that can
481      * be subtracted from the target bitrate in order to compensate
482      * for prior overshoot.
483      *
484      * Valid values in the range 0-1000.
485      */
486     unsigned int           rc_undershoot_pct;
487 
488 
489     /*!\brief Rate control adaptation overshoot 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 added to the target bitrate in order to compensate for
495      * prior undershoot.
496      *
497      * Valid values in the range 0-1000.
498      */
499     unsigned int           rc_overshoot_pct;
500 
501 
502     /*
503      * decoder buffer model parameters
504      */
505 
506 
507     /*!\brief Decoder Buffer Size
508      *
509      * This value indicates the amount of data that may be buffered by the
510      * decoding application. Note that this value is expressed in units of
511      * time (milliseconds). For example, a value of 5000 indicates that the
512      * client will buffer (at least) 5000ms worth of encoded data. Use the
513      * target bitrate (#rc_target_bitrate) to convert to bits/bytes, if
514      * necessary.
515      */
516     unsigned int           rc_buf_sz;
517 
518 
519     /*!\brief Decoder Buffer Initial Size
520      *
521      * This value indicates the amount of data that will be buffered by the
522      * decoding application prior to beginning playback. This value is
523      * expressed in units of time (milliseconds). Use the target bitrate
524      * (#rc_target_bitrate) to convert to bits/bytes, if necessary.
525      */
526     unsigned int           rc_buf_initial_sz;
527 
528 
529     /*!\brief Decoder Buffer Optimal Size
530      *
531      * This value indicates the amount of data that the encoder should try
532      * to maintain in the decoder's buffer. This value is expressed in units
533      * of time (milliseconds). Use the target bitrate (#rc_target_bitrate)
534      * to convert to bits/bytes, if necessary.
535      */
536     unsigned int           rc_buf_optimal_sz;
537 
538 
539     /*
540      * 2 pass rate control parameters
541      */
542 
543 
544     /*!\brief Two-pass mode CBR/VBR bias
545      *
546      * Bias, expressed on a scale of 0 to 100, for determining target size
547      * for the current frame. The value 0 indicates the optimal CBR mode
548      * value should be used. The value 100 indicates the optimal VBR mode
549      * value should be used. Values in between indicate which way the
550      * encoder should "lean."
551      */
552     unsigned int           rc_2pass_vbr_bias_pct;       /**< RC mode bias between CBR and VBR(0-100: 0->CBR, 100->VBR)   */
553 
554 
555     /*!\brief Two-pass mode per-GOP minimum bitrate
556      *
557      * This value, expressed as a percentage of the target bitrate, indicates
558      * the minimum bitrate to be used for a single GOP (aka "section")
559      */
560     unsigned int           rc_2pass_vbr_minsection_pct;
561 
562 
563     /*!\brief Two-pass mode per-GOP maximum bitrate
564      *
565      * This value, expressed as a percentage of the target bitrate, indicates
566      * the maximum bitrate to be used for a single GOP (aka "section")
567      */
568     unsigned int           rc_2pass_vbr_maxsection_pct;
569 
570 
571     /*
572      * keyframing settings (kf)
573      */
574 
575     /*!\brief Keyframe placement mode
576      *
577      * This value indicates whether the encoder should place keyframes at a
578      * fixed interval, or determine the optimal placement automatically
579      * (as governed by the #kf_min_dist and #kf_max_dist parameters)
580      */
581     enum vpx_kf_mode       kf_mode;
582 
583 
584     /*!\brief Keyframe minimum interval
585      *
586      * This value, expressed as a number of frames, prevents the encoder from
587      * placing a keyframe nearer than kf_min_dist to the previous keyframe. At
588      * least kf_min_dist frames non-keyframes will be coded before the next
589      * keyframe. Set kf_min_dist equal to kf_max_dist for a fixed interval.
590      */
591     unsigned int           kf_min_dist;
592 
593 
594     /*!\brief Keyframe maximum interval
595      *
596      * This value, expressed as a number of frames, forces the encoder to code
597      * a keyframe if one has not been coded in the last kf_max_dist frames.
598      * A value of 0 implies all frames will be keyframes. Set kf_min_dist
599      * equal to kf_max_dist for a fixed interval.
600      */
601     unsigned int           kf_max_dist;
602 
603     /*
604      * Spatial scalability settings (ss)
605      */
606 
607     /*!\brief Number of spatial coding layers.
608      *
609      * This value specifies the number of spatial coding layers to be used.
610      */
611     unsigned int           ss_number_layers;
612 
613     /*!\brief Target bitrate for each spatial layer.
614      *
615      * These values specify the target coding bitrate to be used for each
616      * spatial layer.
617      */
618     unsigned int           ss_target_bitrate[VPX_SS_MAX_LAYERS];
619 
620     /*!\brief Number of temporal coding layers.
621      *
622      * This value specifies the number of temporal layers to be used.
623      */
624     unsigned int           ts_number_layers;
625 
626     /*!\brief Target bitrate for each temporal layer.
627      *
628      * These values specify the target coding bitrate to be used for each
629      * temporal layer.
630      */
631     unsigned int           ts_target_bitrate[VPX_TS_MAX_LAYERS];
632 
633     /*!\brief Frame rate decimation factor for each temporal layer.
634      *
635      * These values specify the frame rate decimation factors to apply
636      * to each temporal layer.
637      */
638     unsigned int           ts_rate_decimator[VPX_TS_MAX_LAYERS];
639 
640     /*!\brief Length of the sequence defining frame temporal layer membership.
641      *
642      * This value specifies the length of the sequence that defines the
643      * membership of frames to temporal layers. For example, if the
644      * ts_periodicity = 8, then the frames are assigned to coding layers with a
645      * repeated sequence of length 8.
646     */
647     unsigned int           ts_periodicity;
648 
649     /*!\brief Template defining the membership of frames to temporal layers.
650      *
651      * This array defines the membership of frames to temporal coding layers.
652      * For a 2-layer encoding that assigns even numbered frames to one temporal
653      * layer (0) and odd numbered frames to a second temporal layer (1) with
654      * ts_periodicity=8, then ts_layer_id = (0,1,0,1,0,1,0,1).
655     */
656     unsigned int           ts_layer_id[VPX_TS_MAX_PERIODICITY];
657   } vpx_codec_enc_cfg_t; /**< alias for struct vpx_codec_enc_cfg */
658 
659 
660   /*!\brief Initialize an encoder instance
661    *
662    * Initializes a encoder context using the given interface. Applications
663    * should call the vpx_codec_enc_init convenience macro instead of this
664    * function directly, to ensure that the ABI version number parameter
665    * is properly initialized.
666    *
667    * If the library was configured with --disable-multithread, this call
668    * is not thread safe and should be guarded with a lock if being used
669    * in a multithreaded context.
670    *
671    * In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags
672    * parameter), the storage pointed to by the cfg parameter must be
673    * kept readable and stable until all memory maps have been set.
674    *
675    * \param[in]    ctx     Pointer to this instance's context.
676    * \param[in]    iface   Pointer to the algorithm interface to use.
677    * \param[in]    cfg     Configuration to use, if known. May be NULL.
678    * \param[in]    flags   Bitfield of VPX_CODEC_USE_* flags
679    * \param[in]    ver     ABI version number. Must be set to
680    *                       VPX_ENCODER_ABI_VERSION
681    * \retval #VPX_CODEC_OK
682    *     The decoder algorithm initialized.
683    * \retval #VPX_CODEC_MEM_ERROR
684    *     Memory allocation failed.
685    */
686   vpx_codec_err_t vpx_codec_enc_init_ver(vpx_codec_ctx_t      *ctx,
687                                          vpx_codec_iface_t    *iface,
688                                          vpx_codec_enc_cfg_t  *cfg,
689                                          vpx_codec_flags_t     flags,
690                                          int                   ver);
691 
692 
693   /*!\brief Convenience macro for vpx_codec_enc_init_ver()
694    *
695    * Ensures the ABI version parameter is properly set.
696    */
697 #define vpx_codec_enc_init(ctx, iface, cfg, flags) \
698   vpx_codec_enc_init_ver(ctx, iface, cfg, flags, VPX_ENCODER_ABI_VERSION)
699 
700 
701   /*!\brief Initialize multi-encoder instance
702    *
703    * Initializes multi-encoder context using the given interface.
704    * Applications should call the vpx_codec_enc_init_multi convenience macro
705    * instead of this function directly, to ensure that the ABI version number
706    * parameter is properly initialized.
707    *
708    * In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags
709    * parameter), the storage pointed to by the cfg parameter must be
710    * kept readable and stable until all memory maps have been set.
711    *
712    * \param[in]    ctx     Pointer to this instance's context.
713    * \param[in]    iface   Pointer to the algorithm interface to use.
714    * \param[in]    cfg     Configuration to use, if known. May be NULL.
715    * \param[in]    num_enc Total number of encoders.
716    * \param[in]    flags   Bitfield of VPX_CODEC_USE_* flags
717    * \param[in]    dsf     Pointer to down-sampling factors.
718    * \param[in]    ver     ABI version number. Must be set to
719    *                       VPX_ENCODER_ABI_VERSION
720    * \retval #VPX_CODEC_OK
721    *     The decoder algorithm initialized.
722    * \retval #VPX_CODEC_MEM_ERROR
723    *     Memory allocation failed.
724    */
725   vpx_codec_err_t vpx_codec_enc_init_multi_ver(vpx_codec_ctx_t      *ctx,
726                                                vpx_codec_iface_t    *iface,
727                                                vpx_codec_enc_cfg_t  *cfg,
728                                                int                   num_enc,
729                                                vpx_codec_flags_t     flags,
730                                                vpx_rational_t       *dsf,
731                                                int                   ver);
732 
733 
734   /*!\brief Convenience macro for vpx_codec_enc_init_multi_ver()
735    *
736    * Ensures the ABI version parameter is properly set.
737    */
738 #define vpx_codec_enc_init_multi(ctx, iface, cfg, num_enc, flags, dsf) \
739   vpx_codec_enc_init_multi_ver(ctx, iface, cfg, num_enc, flags, dsf, \
740                                VPX_ENCODER_ABI_VERSION)
741 
742 
743   /*!\brief Get a default configuration
744    *
745    * Initializes a encoder configuration structure with default values. Supports
746    * the notion of "usages" so that an algorithm may offer different default
747    * settings depending on the user's intended goal. This function \ref SHOULD
748    * be called by all applications to initialize the configuration structure
749    * before specializing the configuration with application specific values.
750    *
751    * \param[in]    iface   Pointer to the algorithm interface to use.
752    * \param[out]   cfg     Configuration buffer to populate
753    * \param[in]    usage   End usage. Set to 0 or use codec specific values.
754    *
755    * \retval #VPX_CODEC_OK
756    *     The configuration was populated.
757    * \retval #VPX_CODEC_INCAPABLE
758    *     Interface is not an encoder interface.
759    * \retval #VPX_CODEC_INVALID_PARAM
760    *     A parameter was NULL, or the usage value was not recognized.
761    */
762   vpx_codec_err_t  vpx_codec_enc_config_default(vpx_codec_iface_t    *iface,
763                                                 vpx_codec_enc_cfg_t  *cfg,
764                                                 unsigned int          usage);
765 
766 
767   /*!\brief Set or change configuration
768    *
769    * Reconfigures an encoder instance according to the given configuration.
770    *
771    * \param[in]    ctx     Pointer to this instance's context
772    * \param[in]    cfg     Configuration buffer to use
773    *
774    * \retval #VPX_CODEC_OK
775    *     The configuration was populated.
776    * \retval #VPX_CODEC_INCAPABLE
777    *     Interface is not an encoder interface.
778    * \retval #VPX_CODEC_INVALID_PARAM
779    *     A parameter was NULL, or the usage value was not recognized.
780    */
781   vpx_codec_err_t  vpx_codec_enc_config_set(vpx_codec_ctx_t            *ctx,
782                                             const vpx_codec_enc_cfg_t  *cfg);
783 
784 
785   /*!\brief Get global stream headers
786    *
787    * Retrieves a stream level global header packet, if supported by the codec.
788    *
789    * \param[in]    ctx     Pointer to this instance's context
790    *
791    * \retval NULL
792    *     Encoder does not support global header
793    * \retval Non-NULL
794    *     Pointer to buffer containing global header packet
795    */
796   vpx_fixed_buf_t *vpx_codec_get_global_headers(vpx_codec_ctx_t   *ctx);
797 
798 
799 #define VPX_DL_REALTIME     (1)        /**< deadline parameter analogous to
800   *   VPx REALTIME mode. */
801 #define VPX_DL_GOOD_QUALITY (1000000)  /**< deadline parameter analogous to
802   *   VPx GOOD QUALITY mode. */
803 #define VPX_DL_BEST_QUALITY (0)        /**< deadline parameter analogous to
804   *   VPx BEST QUALITY mode. */
805   /*!\brief Encode a frame
806    *
807    * Encodes a video frame at the given "presentation time." The presentation
808    * time stamp (PTS) \ref MUST be strictly increasing.
809    *
810    * The encoder supports the notion of a soft real-time deadline. Given a
811    * non-zero value to the deadline parameter, the encoder will make a "best
812    * effort" guarantee to  return before the given time slice expires. It is
813    * implicit that limiting the available time to encode will degrade the
814    * output quality. The encoder can be given an unlimited time to produce the
815    * best possible frame by specifying a deadline of '0'. This deadline
816    * supercedes the VPx notion of "best quality, good quality, realtime".
817    * Applications that wish to map these former settings to the new deadline
818    * based system can use the symbols #VPX_DL_REALTIME, #VPX_DL_GOOD_QUALITY,
819    * and #VPX_DL_BEST_QUALITY.
820    *
821    * When the last frame has been passed to the encoder, this function should
822    * continue to be called, with the img parameter set to NULL. This will
823    * signal the end-of-stream condition to the encoder and allow it to encode
824    * any held buffers. Encoding is complete when vpx_codec_encode() is called
825    * and vpx_codec_get_cx_data() returns no data.
826    *
827    * \param[in]    ctx       Pointer to this instance's context
828    * \param[in]    img       Image data to encode, NULL to flush.
829    * \param[in]    pts       Presentation time stamp, in timebase units.
830    * \param[in]    duration  Duration to show frame, in timebase units.
831    * \param[in]    flags     Flags to use for encoding this frame.
832    * \param[in]    deadline  Time to spend encoding, in microseconds. (0=infinite)
833    *
834    * \retval #VPX_CODEC_OK
835    *     The configuration was populated.
836    * \retval #VPX_CODEC_INCAPABLE
837    *     Interface is not an encoder interface.
838    * \retval #VPX_CODEC_INVALID_PARAM
839    *     A parameter was NULL, the image format is unsupported, etc.
840    */
841   vpx_codec_err_t  vpx_codec_encode(vpx_codec_ctx_t            *ctx,
842                                     const vpx_image_t          *img,
843                                     vpx_codec_pts_t             pts,
844                                     unsigned long               duration,
845                                     vpx_enc_frame_flags_t       flags,
846                                     unsigned long               deadline);
847 
848   /*!\brief Set compressed data output buffer
849    *
850    * Sets the buffer that the codec should output the compressed data
851    * into. This call effectively sets the buffer pointer returned in the
852    * next VPX_CODEC_CX_FRAME_PKT packet. Subsequent packets will be
853    * appended into this buffer. The buffer is preserved across frames,
854    * so applications must periodically call this function after flushing
855    * the accumulated compressed data to disk or to the network to reset
856    * the pointer to the buffer's head.
857    *
858    * `pad_before` bytes will be skipped before writing the compressed
859    * data, and `pad_after` bytes will be appended to the packet. The size
860    * of the packet will be the sum of the size of the actual compressed
861    * data, pad_before, and pad_after. The padding bytes will be preserved
862    * (not overwritten).
863    *
864    * Note that calling this function does not guarantee that the returned
865    * compressed data will be placed into the specified buffer. In the
866    * event that the encoded data will not fit into the buffer provided,
867    * the returned packet \ref MAY point to an internal buffer, as it would
868    * if this call were never used. In this event, the output packet will
869    * NOT have any padding, and the application must free space and copy it
870    * to the proper place. This is of particular note in configurations
871    * that may output multiple packets for a single encoded frame (e.g., lagged
872    * encoding) or if the application does not reset the buffer periodically.
873    *
874    * Applications may restore the default behavior of the codec providing
875    * the compressed data buffer by calling this function with a NULL
876    * buffer.
877    *
878    * Applications \ref MUSTNOT call this function during iteration of
879    * vpx_codec_get_cx_data().
880    *
881    * \param[in]    ctx         Pointer to this instance's context
882    * \param[in]    buf         Buffer to store compressed data into
883    * \param[in]    pad_before  Bytes to skip before writing compressed data
884    * \param[in]    pad_after   Bytes to skip after writing compressed data
885    *
886    * \retval #VPX_CODEC_OK
887    *     The buffer was set successfully.
888    * \retval #VPX_CODEC_INVALID_PARAM
889    *     A parameter was NULL, the image format is unsupported, etc.
890    */
891   vpx_codec_err_t vpx_codec_set_cx_data_buf(vpx_codec_ctx_t       *ctx,
892                                             const vpx_fixed_buf_t *buf,
893                                             unsigned int           pad_before,
894                                             unsigned int           pad_after);
895 
896 
897   /*!\brief Encoded data iterator
898    *
899    * Iterates over a list of data packets to be passed from the encoder to the
900    * application. The different kinds of packets available are enumerated in
901    * #vpx_codec_cx_pkt_kind.
902    *
903    * #VPX_CODEC_CX_FRAME_PKT packets should be passed to the application's
904    * muxer. Multiple compressed frames may be in the list.
905    * #VPX_CODEC_STATS_PKT packets should be appended to a global buffer.
906    *
907    * The application \ref MUST silently ignore any packet kinds that it does
908    * not recognize or support.
909    *
910    * The data buffers returned from this function are only guaranteed to be
911    * valid until the application makes another call to any vpx_codec_* function.
912    *
913    * \param[in]     ctx      Pointer to this instance's context
914    * \param[in,out] iter     Iterator storage, initialized to NULL
915    *
916    * \return Returns a pointer to an output data packet (compressed frame data,
917    *         two-pass statistics, etc.) or NULL to signal end-of-list.
918    *
919    */
920   const vpx_codec_cx_pkt_t *vpx_codec_get_cx_data(vpx_codec_ctx_t   *ctx,
921                                                   vpx_codec_iter_t  *iter);
922 
923 
924   /*!\brief Get Preview Frame
925    *
926    * Returns an image that can be used as a preview. Shows the image as it would
927    * exist at the decompressor. The application \ref MUST NOT write into this
928    * image buffer.
929    *
930    * \param[in]     ctx      Pointer to this instance's context
931    *
932    * \return Returns a pointer to a preview image, or NULL if no image is
933    *         available.
934    *
935    */
936   const vpx_image_t *vpx_codec_get_preview_frame(vpx_codec_ctx_t   *ctx);
937 
938 
939   /*!@} - end defgroup encoder*/
940 #ifdef __cplusplus
941 }
942 #endif
943 #endif  // VPX_VPX_ENCODER_H_
944 
945