1 /*****************************************************************************
2 * x264.h: h264 encoder library
3 *****************************************************************************
4 * Copyright (C) 2003-2008 x264 Project
6 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
7 * Loren Merritt <lorenm@u.washington.edu>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
22 *****************************************************************************/
27 #if !defined(_STDINT_H) && !defined(_STDINT_H_) && \
28 !defined(_INTTYPES_H) && !defined(_INTTYPES_H_)
30 # pragma message("You must include stdint.h or inttypes.h before x264.h")
32 # warning You must include stdint.h or inttypes.h before x264.h
41 * opaque handler for encoder */
42 typedef struct x264_t x264_t;
44 /****************************************************************************
46 ****************************************************************************/
49 #define X264_CPU_CACHELINE_32 0x000001 /* avoid memory loads that span the border between two cachelines */
50 #define X264_CPU_CACHELINE_64 0x000002 /* 32/64 is the size of a cacheline in bytes */
51 #define X264_CPU_ALTIVEC 0x000004
52 #define X264_CPU_MMX 0x000008
53 #define X264_CPU_MMXEXT 0x000010 /* MMX2 aka MMXEXT aka ISSE */
54 #define X264_CPU_SSE 0x000020
55 #define X264_CPU_SSE2 0x000040
56 #define X264_CPU_SSE2_IS_SLOW 0x000080 /* avoid most SSE2 functions on Athlon64 */
57 #define X264_CPU_SSE2_IS_FAST 0x000100 /* a few functions are only faster on Core2 and Phenom */
58 #define X264_CPU_SSE3 0x000200
59 #define X264_CPU_SSSE3 0x000400
60 #define X264_CPU_SHUFFLE_IS_FAST 0x000800 /* Penryn, Nehalem, and Phenom have fast shuffle units */
61 #define X264_CPU_STACK_MOD4 0x001000 /* if stack is only mod4 and not mod16 */
62 #define X264_CPU_SSE4 0x002000 /* SSE4.1 */
63 #define X264_CPU_SSE42 0x004000 /* SSE4.2 */
64 #define X264_CPU_SSE_MISALIGN 0x008000 /* Phenom support for misaligned SSE instruction arguments */
65 #define X264_CPU_LZCNT 0x010000 /* Phenom support for "leading zero count" instruction. */
66 #define X264_CPU_ARMV6 0x020000
67 #define X264_CPU_NEON 0x040000 /* ARM NEON */
68 #define X264_CPU_FAST_NEON_MRC 0x080000 /* Transfer from NEON to ARM register is fast (Cortex-A9) */
69 #define X264_CPU_SLOW_CTZ 0x100000 /* BSR/BSF x86 instructions are really slow on some CPUs */
70 #define X264_CPU_SLOW_ATOM 0x200000 /* The Atom just sucks */
74 #define X264_ANALYSE_I4x4 0x0001 /* Analyse i4x4 */
75 #define X264_ANALYSE_I8x8 0x0002 /* Analyse i8x8 (requires 8x8 transform) */
76 #define X264_ANALYSE_PSUB16x16 0x0010 /* Analyse p16x8, p8x16 and p8x8 */
77 #define X264_ANALYSE_PSUB8x8 0x0020 /* Analyse p8x4, p4x8, p4x4 */
78 #define X264_ANALYSE_BSUB16x16 0x0100 /* Analyse b16x8, b8x16 and b8x8 */
79 #define X264_DIRECT_PRED_NONE 0
80 #define X264_DIRECT_PRED_SPATIAL 1
81 #define X264_DIRECT_PRED_TEMPORAL 2
82 #define X264_DIRECT_PRED_AUTO 3
87 #define X264_ME_TESA 4
88 #define X264_CQM_FLAT 0
89 #define X264_CQM_JVT 1
90 #define X264_CQM_CUSTOM 2
94 #define X264_AQ_NONE 0
95 #define X264_AQ_VARIANCE 1
96 #define X264_AQ_AUTOVARIANCE 2
97 #define X264_B_ADAPT_NONE 0
98 #define X264_B_ADAPT_FAST 1
99 #define X264_B_ADAPT_TRELLIS 2
100 #define X264_WEIGHTP_NONE 0
101 #define X264_WEIGHTP_BLIND 1
102 #define X264_WEIGHTP_SMART 2
103 #define X264_B_PYRAMID_NONE 0
104 #define X264_B_PYRAMID_STRICT 1
105 #define X264_B_PYRAMID_NORMAL 2
106 #define X264_KEYINT_MIN_AUTO 0
108 static const char * const x264_direct_pred_names[] = { "none", "spatial", "temporal", "auto", 0 };
109 static const char * const x264_motion_est_names[] = { "dia", "hex", "umh", "esa", "tesa", 0 };
110 static const char * const x264_b_pyramid_names[] = { "none", "strict", "normal", 0 };
111 static const char * const x264_overscan_names[] = { "undef", "show", "crop", 0 };
112 static const char * const x264_vidformat_names[] = { "component", "pal", "ntsc", "secam", "mac", "undef", 0 };
113 static const char * const x264_fullrange_names[] = { "off", "on", 0 };
114 static const char * const x264_colorprim_names[] = { "", "bt709", "undef", "", "bt470m", "bt470bg", "smpte170m", "smpte240m", "film", 0 };
115 static const char * const x264_transfer_names[] = { "", "bt709", "undef", "", "bt470m", "bt470bg", "smpte170m", "smpte240m", "linear", "log100", "log316", 0 };
116 static const char * const x264_colmatrix_names[] = { "GBR", "bt709", "undef", "", "fcc", "bt470bg", "smpte170m", "smpte240m", "YCgCo", 0 };
117 static const char * const x264_nal_hrd_names[] = { "none", "vbr", "cbr", 0 };
120 * legacy only; nothing other than I420 is really supported. */
121 #define X264_CSP_MASK 0x00ff /* */
122 #define X264_CSP_NONE 0x0000 /* Invalid mode */
123 #define X264_CSP_I420 0x0001 /* yuv 4:2:0 planar */
124 #define X264_CSP_I422 0x0002 /* yuv 4:2:2 planar */
125 #define X264_CSP_I444 0x0003 /* yuv 4:4:4 planar */
126 #define X264_CSP_YV12 0x0004 /* yuv 4:2:0 planar */
127 #define X264_CSP_YUYV 0x0005 /* yuv 4:2:2 packed */
128 #define X264_CSP_RGB 0x0006 /* rgb 24bits */
129 #define X264_CSP_BGR 0x0007 /* bgr 24bits */
130 #define X264_CSP_BGRA 0x0008 /* bgr 32bits */
131 #define X264_CSP_MAX 0x0009 /* end of list */
132 #define X264_CSP_VFLIP 0x1000 /* */
135 #define X264_TYPE_AUTO 0x0000 /* Let x264 choose the right type */
136 #define X264_TYPE_IDR 0x0001
137 #define X264_TYPE_I 0x0002
138 #define X264_TYPE_P 0x0003
139 #define X264_TYPE_BREF 0x0004 /* Non-disposable B-frame */
140 #define X264_TYPE_B 0x0005
141 #define IS_X264_TYPE_I(x) ((x)==X264_TYPE_I || (x)==X264_TYPE_IDR)
142 #define IS_X264_TYPE_B(x) ((x)==X264_TYPE_B || (x)==X264_TYPE_BREF)
145 #define X264_LOG_NONE (-1)
146 #define X264_LOG_ERROR 0
147 #define X264_LOG_WARNING 1
148 #define X264_LOG_INFO 2
149 #define X264_LOG_DEBUG 3
152 #define X264_THREADS_AUTO 0 /* Automatically select optimal number of threads */
153 #define X264_SYNC_LOOKAHEAD_AUTO (-1) /* Automatically select optimal lookahead thread buffer size */
156 #define X264_NAL_HRD_NONE 0
157 #define X264_NAL_HRD_VBR 1
158 #define X264_NAL_HRD_CBR 2
160 /* Zones: override ratecontrol or other options for specific sections of the video.
161 * See x264_encoder_reconfig() for which options can be changed.
162 * If zones overlap, whichever comes later in the list takes precedence. */
165 int i_start, i_end; /* range of frame numbers */
166 int b_force_qp; /* whether to use qp vs bitrate factor */
168 float f_bitrate_factor;
169 struct x264_param_t *param;
172 typedef struct x264_param_t
176 int i_threads; /* encode multiple frames in parallel */
177 int b_sliced_threads; /* Whether to use slice-based threading. */
178 int b_deterministic; /* whether to allow non-deterministic optimizations when threaded */
179 int i_sync_lookahead; /* threaded lookahead buffer */
181 /* Video Properties */
184 int i_csp; /* CSP of encoded bitstream, only i420 supported */
186 int i_frame_total; /* number of frames to encode if known, else 0 */
189 * Uses Buffering and Picture Timing SEIs to signal HRD
190 * The HRD in H.264 was not designed with VFR in mind.
191 * It is therefore not recommendeded to use NAL HRD with VFR.
192 * Furthermore, reconfiguring the VBV (via x264_encoder_reconfig)
193 * will currently generate invalid HRD. */
198 /* they will be reduced to be 0 < x <= 65535 and prime */
202 int i_overscan; /* 0=undef, 1=no overscan, 2=overscan */
204 /* see h264 annex E for the values of the following */
210 int i_chroma_loc; /* both top & bottom */
213 /* Bitstream parameters */
214 int i_frame_reference; /* Maximum number of reference frames */
215 int i_keyint_max; /* Force an IDR keyframe at this interval */
216 int i_keyint_min; /* Scenecuts closer together than this are coded as I, not IDR. */
217 int i_scenecut_threshold; /* how aggressively to insert extra I frames */
218 int b_intra_refresh; /* Whether or not to use periodic intra refresh instead of IDR frames. */
220 int i_bframe; /* how many b-frame between 2 references pictures */
221 int i_bframe_adaptive;
223 int i_bframe_pyramid; /* Keep some B-frames as references: 0=off, 1=strict hierarchical, 2=normal */
225 int b_deblocking_filter;
226 int i_deblocking_filter_alphac0; /* [-6, 6] -6 light filter, 6 strong */
227 int i_deblocking_filter_beta; /* [-6, 6] idem */
230 int i_cabac_init_idc;
233 int b_constrained_intra;
236 char *psz_cqm_file; /* JM format */
237 uint8_t cqm_4iy[16]; /* used only if i_cqm_preset == X264_CQM_CUSTOM */
245 void (*pf_log)( void *, int i_level, const char *psz, va_list );
249 char *psz_dump_yuv; /* filename for reconstructed frames */
251 /* Encoder analyser parameters */
254 unsigned int intra; /* intra partitions */
255 unsigned int inter; /* inter partitions */
258 int i_weighted_pred; /* weighting for P-frames */
259 int b_weighted_bipred; /* implicit weighting for B-frames */
260 int i_direct_mv_pred; /* spatial vs temporal mv prediction */
261 int i_chroma_qp_offset;
263 int i_me_method; /* motion estimation algorithm to use (X264_ME_*) */
264 int i_me_range; /* integer pixel motion estimation search range (from predicted mv) */
265 int i_mv_range; /* maximum length of a mv (in pixels). -1 = auto, based on level */
266 int i_mv_range_thread; /* minimum space between threads. -1 = auto, based on number of threads. */
267 int i_subpel_refine; /* subpixel motion estimation quality */
268 int b_chroma_me; /* chroma ME for subpel and mode decision in P-frames */
269 int b_mixed_references; /* allow each mb partition to have its own reference number */
270 int i_trellis; /* trellis RD quantization */
271 int b_fast_pskip; /* early SKIP detection on P-frames */
272 int b_dct_decimate; /* transform coefficient thresholding on P-frames */
273 int i_noise_reduction; /* adaptive pseudo-deadzone */
274 float f_psy_rd; /* Psy RD strength */
275 float f_psy_trellis; /* Psy trellis strength */
276 int b_psy; /* Toggle all psy optimizations */
278 /* the deadzone size that will be used in luma quantization */
279 int i_luma_deadzone[2]; /* {inter, intra} */
281 int b_psnr; /* compute and print PSNR stats */
282 int b_ssim; /* compute and print SSIM stats */
285 /* Rate control parameters */
288 int i_rc_method; /* X264_RC_* */
290 int i_qp_constant; /* 0-51 */
291 int i_qp_min; /* min allowed QP value */
292 int i_qp_max; /* max allowed QP value */
293 int i_qp_step; /* max QP step between frames */
296 float f_rf_constant; /* 1pass VBR, nominal QP */
297 float f_rf_constant_max; /* In CRF mode, maximum CRF as caused by VBV */
298 float f_rate_tolerance;
299 int i_vbv_max_bitrate;
300 int i_vbv_buffer_size;
301 float f_vbv_buffer_init; /* <=1: fraction of buffer_size. >1: kbit */
305 int i_aq_mode; /* psy adaptive QP. (X264_AQ_*) */
307 int b_mb_tree; /* Macroblock-tree ratecontrol. */
311 int b_stat_write; /* Enable stat writing in psz_stat_out */
313 int b_stat_read; /* Read stat from psz_stat_in and use it */
316 /* 2pass params (same as ffmpeg ones) */
317 float f_qcompress; /* 0.0 => cbr, 1.0 => constant qp */
318 float f_qblur; /* temporally blur quants */
319 float f_complexity_blur; /* temporally blur complexity */
320 x264_zone_t *zones; /* ratecontrol overrides */
321 int i_zones; /* number of zone_t's */
322 char *psz_zones; /* alternate method of specifying zones */
325 /* Muxing parameters */
326 int b_aud; /* generate access unit delimiters */
327 int b_repeat_headers; /* put SPS/PPS before each keyframe */
328 int b_annexb; /* if set, place start codes (4 bytes) before NAL units,
329 * otherwise place size (4 bytes) before NAL units. */
330 int i_sps_id; /* SPS and PPS id number */
331 int b_vfr_input; /* VFR input */
334 uint32_t i_timebase_num; /* Timebase numerator */
335 uint32_t i_timebase_den; /* Timebase denominator */
336 int b_dts_compress; /* DTS compression: this algorithm eliminates negative DTS
337 * by compressing them to be less than the second PTS.
338 * Warning: this will change the timebase! */
343 * The correct pic_struct must be passed with each input frame.
344 * The input timebase should be the timebase corresponding to the output framerate. This should be constant.
345 * e.g. for 3:2 pulldown timebase should be 1001/30000
346 * The PTS passed with each frame must be the PTS of the frame after pulldown is applied.
347 * Frame doubling and tripling require b_vfr_input set to zero (see H.264 Table D-1)
349 * Pulldown changes are not clearly defined in H.264. Therefore, it is the calling app's responsibility to manage this.
356 * Used only when b_interlaced=0. Setting this flag makes it possible to flag the stream as PAFF interlaced yet
357 * encode all frames progessively. It is useful for encoding 25p and 30p Blu-Ray streams.
360 int b_fake_interlaced;
362 /* Slicing parameters */
363 int i_slice_max_size; /* Max size per slice in bytes; includes estimated NAL overhead. */
364 int i_slice_max_mbs; /* Max number of MBs per slice; overrides i_slice_count. */
365 int i_slice_count; /* Number of slices per frame: forces rectangular slices. */
367 /* Optional callback for freeing this x264_param_t when it is done being used.
368 * Only used when the x264_param_t sits in memory for an indefinite period of time,
369 * i.e. when an x264_param_t is passed to x264_t in an x264_picture_t or in zones.
370 * Not used when x264_encoder_reconfig is called directly. */
371 void (*param_free)( void* );
374 /****************************************************************************
375 * H.264 level restriction information
376 ****************************************************************************/
380 int mbps; /* max macroblock processing rate (macroblocks/sec) */
381 int frame_size; /* max frame size (macroblocks) */
382 int dpb; /* max decoded picture buffer (bytes) */
383 int bitrate; /* max bitrate (kbit/sec) */
384 int cpb; /* max vbv buffer (kbit) */
385 int mv_range; /* max vertical mv component range (pixels) */
386 int mvs_per_2mb; /* max mvs per 2 consecutive mbs. */
387 int slice_rate; /* ?? */
388 int mincr; /* min compression ratio */
389 int bipred8x8; /* limit bipred to >=8x8 */
390 int direct8x8; /* limit b_direct to >=8x8 */
391 int frame_only; /* forbid interlacing */
394 /* all of the levels defined in the standard, terminated by .level_idc=0 */
395 extern const x264_level_t x264_levels[];
397 /****************************************************************************
398 * Basic parameter handling functions
399 ****************************************************************************/
401 /* x264_param_default:
402 * fill x264_param_t with default values and do CPU detection */
403 void x264_param_default( x264_param_t * );
406 * set one parameter by name.
407 * returns 0 on success, or returns one of the following errors.
408 * note: BAD_VALUE occurs only if it can't even parse the value,
409 * numerical range is not checked until x264_encoder_open() or
410 * x264_encoder_reconfig().
411 * value=NULL means "true" for boolean options, but is a BAD_VALUE for non-booleans. */
412 #define X264_PARAM_BAD_NAME (-1)
413 #define X264_PARAM_BAD_VALUE (-2)
414 int x264_param_parse( x264_param_t *, const char *name, const char *value );
416 /****************************************************************************
417 * Advanced parameter handling functions
418 ****************************************************************************/
420 /* These functions expose the full power of x264's preset-tune-profile system for
421 * easy adjustment of large numbers of internal parameters.
423 * In order to replicate x264CLI's option handling, these functions MUST be called
424 * in the following order:
425 * 1) x264_param_default_preset
426 * 2) Custom user options (via param_parse or directly assigned variables)
427 * 3) x264_param_apply_fastfirstpass
428 * 4) x264_param_apply_profile
430 * Additionally, x264CLI does not apply step 3 if the preset chosen is "placebo"
431 * or --slow-firstpass is set. */
433 /* x264_param_default_preset:
434 * The same as x264_param_default, but also use the passed preset and tune
435 * to modify the default settings.
436 * (either can be NULL, which implies no preset or no tune, respectively)
438 * Currently available presets are, ordered from fastest to slowest: */
439 static const char * const x264_preset_names[] = { "ultrafast", "superfast", "veryfast", "faster", "fast", "medium", "slow", "slower", "veryslow", "placebo", 0 };
441 /* Warning: the speed of these presets scales dramatically. Ultrafast is a full
442 * 100 times faster than placebo!
444 * Currently available tunings are: */
445 static const char * const x264_tune_names[] = { "film", "animation", "grain", "stillimage", "psnr", "ssim", "fastdecode", "zerolatency", 0 };
447 /* Multiple tunings can be used if separated by a delimiter in ",./-+",
448 * however multiple psy tunings cannot be used.
449 * film, animation, grain, stillimage, psnr, and ssim are psy tunings.
451 * returns 0 on success, negative on failure (e.g. invalid preset/tune name). */
452 int x264_param_default_preset( x264_param_t *, const char *preset, const char *tune );
454 /* x264_param_apply_fastfirstpass:
455 * If first-pass mode is set (rc.b_stat_read == 0, rc.b_stat_write == 1),
456 * modify the encoder settings to disable options generally not useful on
458 void x264_param_apply_fastfirstpass( x264_param_t * );
460 /* x264_param_apply_profile:
461 * Applies the restrictions of the given profile.
462 * Currently available profiles are, from most to least restrictive: */
463 static const char * const x264_profile_names[] = { "baseline", "main", "high", 0 };
465 /* (can be NULL, in which case the function will do nothing)
467 * Does NOT guarantee that the given profile will be used: if the restrictions
468 * of "High" are applied to settings that are already Baseline-compatible, the
469 * stream will remain baseline. In short, it does not increase settings, only
472 * returns 0 on success, negative on failure (e.g. invalid profile name). */
473 int x264_param_apply_profile( x264_param_t *, const char *profile );
475 /****************************************************************************
476 * Picture structures and functions
477 ****************************************************************************/
481 PIC_STRUCT_AUTO = 0, // automatically decide (default)
482 PIC_STRUCT_PROGRESSIVE = 1, // progressive frame
483 // "TOP" and "BOTTOM" are not supported in x264 (PAFF only)
484 PIC_STRUCT_TOP_BOTTOM = 4, // top field followed by bottom
485 PIC_STRUCT_BOTTOM_TOP = 5, // bottom field followed by top
486 PIC_STRUCT_TOP_BOTTOM_TOP = 6, // top field, bottom field, top field repeated
487 PIC_STRUCT_BOTTOM_TOP_BOTTOM = 7, // bottom field, top field, bottom field repeated
488 PIC_STRUCT_DOUBLE = 8, // double frame
489 PIC_STRUCT_TRIPLE = 9, // triple frame
494 double cpb_initial_arrival_time;
495 double cpb_final_arrival_time;
496 double cpb_removal_time;
498 double dpb_output_time;
503 int i_csp; /* Colorspace */
504 int i_plane; /* Number of image planes */
505 int i_stride[4]; /* Strides for each plane */
506 uint8_t *plane[4]; /* Pointers to each plane */
511 /* In: an array of quantizer offsets to be applied to this image during encoding.
512 * These are added on top of the decisions made by x264.
513 * Offsets can be fractional; they are added before QPs are rounded to integer.
514 * Adaptive quantization must be enabled to use this feature. Behavior if quant
515 * offsets differ between encoding passes is undefined.
517 * Array contains one offset per macroblock, in raster scan order. In interlaced
518 * mode, top-field MBs and bottom-field MBs are interleaved at the row level. */
519 float *quant_offsets;
520 /* In: optional callback to free quant_offsets when used.
521 * Useful if one wants to use a different quant_offset array for each frame. */
522 void (*quant_offsets_free)( void* );
523 } x264_image_properties_t;
527 /* In: force picture type (if not auto)
528 * If x264 encoding parameters are violated in the forcing of picture types,
529 * x264 will correct the input picture type and log a warning.
530 * The quality of frametype decisions may suffer if a great deal of fine-grained
531 * mixing of auto and forced frametypes is done.
532 * Out: type of the picture encoded */
534 /* In: force quantizer for > 0 */
536 /* In: pic_struct, for pulldown/doubling/etc...used only if b_pic_timing_sei=1.
537 * use pic_struct_e for pic_struct inputs */
539 /* Out: whether this frame is a keyframe. Important when using modes that result in
540 * SEI recovery points being used instead of IDR frames. */
542 /* In: user pts, Out: pts of encoded picture (user)*/
544 /* Out: frame dts. Since the pts of the first frame is always zero,
545 * initial frames may have a negative dts which must be dealt with by any muxer */
547 /* In: custom encoding parameters to be set from this frame forwards
548 (in coded order, not display order). If NULL, continue using
549 parameters from the previous frame. Some parameters, such as
550 aspect ratio, can only be changed per-GOP due to the limitations
551 of H.264 itself; in this case, the caller must force an IDR frame
552 if it needs the changed parameter to apply immediately. */
556 /* In: optional information to modify encoder decisions for this frame */
557 x264_image_properties_t prop;
558 /* Out: HRD timing information. Output only when i_nal_hrd is set. */
559 x264_hrd_t hrd_timing;
560 /* private user data. libx264 doesn't touch this,
561 not even copy it from input to output frames. */
565 /* x264_picture_alloc:
566 * alloc data for a picture. You must call x264_picture_clean on it.
567 * returns 0 on success, or -1 on malloc failure. */
568 int x264_picture_alloc( x264_picture_t *pic, int i_csp, int i_width, int i_height );
570 /* x264_picture_clean:
571 * free associated resource for a x264_picture_t allocated with
572 * x264_picture_alloc ONLY */
573 void x264_picture_clean( x264_picture_t *pic );
575 /****************************************************************************
576 * NAL structure and functions
577 ****************************************************************************/
586 NAL_SLICE_IDR = 5, /* ref_idc != 0 */
587 NAL_SEI = 6, /* ref_idc == 0 */
592 /* ref_idc == 0 for 6,9,10,11,12 */
596 NAL_PRIORITY_DISPOSABLE = 0,
597 NAL_PRIORITY_LOW = 1,
598 NAL_PRIORITY_HIGH = 2,
599 NAL_PRIORITY_HIGHEST = 3,
602 /* The data within the payload is already NAL-encapsulated; the ref_idc and type
603 * are merely in the struct for easy access by the calling application.
604 * All data returned in an x264_nal_t, including the data in p_payload, is no longer
605 * valid after the next call to x264_encoder_encode. Thus it must be used or copied
606 * before calling x264_encoder_encode or x264_encoder_headers again. */
609 int i_ref_idc; /* nal_priority_e */
610 int i_type; /* nal_unit_type_e */
612 /* Size of payload in bytes. */
614 /* If param->b_annexb is set, Annex-B bytestream with 4-byte startcode.
615 * Otherwise, startcode is replaced with a 4-byte size.
616 * This size is the size used in mp4/similar muxing; it is equal to i_payload-4 */
620 /****************************************************************************
622 ****************************************************************************/
624 /* Force a link error in the case of linking against an incompatible API version.
625 * Glue #defines exist to force correct macro expansion; the final output of the macro
626 * is x264_encoder_open_##X264_BUILD (for purposes of dlopen). */
627 #define x264_encoder_glue1(x,y) x##y
628 #define x264_encoder_glue2(x,y) x264_encoder_glue1(x,y)
629 #define x264_encoder_open x264_encoder_glue2(x264_encoder_open_,X264_BUILD)
631 /* x264_encoder_open:
632 * create a new encoder handler, all parameters from x264_param_t are copied */
633 x264_t *x264_encoder_open( x264_param_t * );
635 /* x264_encoder_reconfig:
636 * various parameters from x264_param_t are copied.
637 * this takes effect immediately, on whichever frame is encoded next;
638 * due to delay, this may not be the next frame passed to encoder_encode.
639 * if the change should apply to some particular frame, use x264_picture_t->param instead.
640 * returns 0 on success, negative on parameter validation error.
641 * not all parameters can be changed; see the actual function for a detailed breakdown. */
642 int x264_encoder_reconfig( x264_t *, x264_param_t * );
643 /* x264_encoder_parameters:
644 * copies the current internal set of parameters to the pointer provided
645 * by the caller. useful when the calling application needs to know
646 * how x264_encoder_open has changed the parameters, or the current state
647 * of the encoder after multiple x264_encoder_reconfig calls.
648 * note that the data accessible through pointers in the returned param struct
649 * (e.g. filenames) should not be modified by the calling application. */
650 void x264_encoder_parameters( x264_t *, x264_param_t * );
651 /* x264_encoder_headers:
652 * return the SPS and PPS that will be used for the whole stream.
653 * *pi_nal is the number of NAL units outputted in pp_nal.
654 * returns negative on error.
655 * the payloads of all output NALs are guaranteed to be sequential in memory. */
656 int x264_encoder_headers( x264_t *, x264_nal_t **pp_nal, int *pi_nal );
657 /* x264_encoder_encode:
658 * encode one picture.
659 * *pi_nal is the number of NAL units outputted in pp_nal.
660 * returns negative on error, zero if no NAL units returned.
661 * the payloads of all output NALs are guaranteed to be sequential in memory. */
662 int x264_encoder_encode( x264_t *, x264_nal_t **pp_nal, int *pi_nal, x264_picture_t *pic_in, x264_picture_t *pic_out );
663 /* x264_encoder_close:
664 * close an encoder handler */
665 void x264_encoder_close ( x264_t * );
666 /* x264_encoder_delayed_frames:
667 * return the number of currently delayed (buffered) frames
668 * this should be used at the end of the stream, to know when you have all the encoded frames. */
669 int x264_encoder_delayed_frames( x264_t * );
670 /* x264_encoder_intra_refresh:
671 * If an intra refresh is not in progress, begin one with the next P-frame.
672 * If an intra refresh is in progress, begin one as soon as the current one finishes.
673 * Requires that b_intra_refresh be set.
674 * Useful for interactive streaming where the client can tell the server that packet loss has
675 * occurred. In this case, keyint can be set to an extremely high value so that intra refreshes
676 * only occur when calling x264_encoder_intra_refresh. */
677 void x264_encoder_intra_refresh( x264_t * );