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27 * \brief The H.264 encoding API
29 * This file contains the \ref api_enc_h264 "H.264 encoding API".
39 #include <va/va_enc.h>
42 * \defgroup api_enc_h264 H.264 encoding API
50 * Those flags flags are meant to signal when a picture marks the end
51 * of a sequence, a stream, or even both at once.
56 * \brief Marks the last picture in the sequence.
58 * i.e. the driver appends \c end_of_seq() NAL unit to the encoded frame.
60 #define H264_LAST_PICTURE_EOSEQ 0x01
62 * \brief Marks the last picture in the stream.
64 * i.e. the driver appends \c end_of_stream() NAL unit to the encoded frame.
66 #define H264_LAST_PICTURE_EOSTREAM 0x02
70 * \brief Packed header types specific to H.264 encoding.
72 * Types of packed headers generally used for H.264 encoding. Each
73 * associated packed header data buffer shall contain the start code
74 * prefix 0x000001 followed by the complete NAL unit, thus also
75 * including the \c nal_unit_type.
77 * Note: the start code prefix can contain an arbitrary number of leading
78 * zeros. The driver will skip them for emulation prevention bytes insertion,
83 * \brief Packed Sequence Parameter Set (SPS).
85 * The corresponding packed header data buffer shall contain the
86 * complete seq_parameter_set_rbsp() syntax element.
88 * Note: packed \c nal_unit_type shall be equal to 7.
90 VAEncPackedHeaderH264_SPS = VAEncPackedHeaderSequence,
92 * \brief Packed Picture Parameter Set (PPS).
94 * The corresponding packed header data buffer shall contain the
95 * complete pic_parameter_set_rbsp() syntax element.
97 * Note: packed \c nal_unit_type shall be equal to 8.
99 VAEncPackedHeaderH264_PPS = VAEncPackedHeaderPicture,
101 * \brief Packed slice header.
103 * The corresponding packed header data buffer shall contain the
104 * \c slice_header() syntax element only, along with any start
105 * code prefix and NAL unit type preceeding it. i.e. this means
106 * that the buffer does not contain any of the \c slice_data() or
107 * the \c rbsp_slice_trailing_bits().
109 * Note: packed \c nal_unit_type shall be equal to 1 (non-IDR
110 * picture), or 5 (IDR picture).
112 VAEncPackedHeaderH264_Slice = VAEncPackedHeaderSlice,
114 * \brief Packed Supplemental Enhancement Information (SEI).
116 * The corresponding packed header data buffer shall contain the
117 * complete sei_rbsp() syntax element, thus including several
118 * sei_message() elements if necessary.
120 * Note: packed \c nal_unit_type shall be equal to 6.
122 VAEncPackedHeaderH264_SEI = (VAEncPackedHeaderMiscMask | 1),
123 } VAEncPackedHeaderTypeH264;
126 * \brief Sequence parameter for H.264 encoding in main & high profiles.
128 * This structure holds information for \c seq_parameter_set_data() as
129 * defined by the H.264 specification.
131 * If packed sequence headers mode is used, i.e. if the encoding
132 * pipeline was configured with the #VA_ENC_PACKED_HEADER_SEQUENCE
133 * flag, then the driver expects two more buffers to be provided to
134 * the same \c vaRenderPicture() as this buffer:
135 * - a #VAEncPackedHeaderParameterBuffer with type set to
136 * VAEncPackedHeaderType::VAEncPackedHeaderSequence ;
137 * - a #VAEncPackedHeaderDataBuffer which holds the actual packed
140 * If \c seq_scaling_matrix_present_flag is set to \c 1, then a
141 * #VAIQMatrixBufferH264 buffer shall also be provided within the same
142 * \c vaRenderPicture() call as this sequence parameter buffer.
144 typedef struct _VAEncSequenceParameterBufferH264 {
145 /** \brief Same as the H.264 bitstream syntax element. */
146 unsigned char seq_parameter_set_id;
147 /** \brief Same as the H.264 bitstream syntax element. */
148 unsigned char level_idc;
149 /** \brief Period between I frames. */
150 unsigned int intra_period;
151 /** \brief Period between IDR frames. */
152 unsigned int intra_idr_period;
153 /** \brief Period between I/P frames. */
154 unsigned int ip_period;
156 * \brief Initial bitrate set for this sequence in CBR or VBR modes.
158 * This field represents the initial bitrate value for this
159 * sequence if CBR or VBR mode is used, i.e. if the encoder
160 * pipeline was created with a #VAConfigAttribRateControl
161 * attribute set to either \ref VA_RC_CBR or \ref VA_RC_VBR.
163 * The bitrate can be modified later on through
164 * #VAEncMiscParameterRateControl buffers.
166 unsigned int bits_per_second;
167 /** \brief Same as the H.264 bitstream syntax element. */
168 unsigned int max_num_ref_frames;
169 /** \brief Picture width in macroblocks. */
170 unsigned short picture_width_in_mbs;
171 /** \brief Picture height in macroblocks. */
172 unsigned short picture_height_in_mbs;
176 /** \brief Same as the H.264 bitstream syntax element. */
177 unsigned int chroma_format_idc : 2;
178 /** \brief Same as the H.264 bitstream syntax element. */
179 unsigned int frame_mbs_only_flag : 1;
180 /** \brief Same as the H.264 bitstream syntax element. */
181 unsigned int mb_adaptive_frame_field_flag : 1;
182 /** \brief Same as the H.264 bitstream syntax element. */
183 unsigned int seq_scaling_matrix_present_flag : 1;
184 /** \brief Same as the H.264 bitstream syntax element. */
185 unsigned int direct_8x8_inference_flag : 1;
186 /** \brief Same as the H.264 bitstream syntax element. */
187 unsigned int log2_max_frame_num_minus4 : 4;
188 /** \brief Same as the H.264 bitstream syntax element. */
189 unsigned int pic_order_cnt_type : 2;
190 /** \brief Same as the H.264 bitstream syntax element. */
191 unsigned int log2_max_pic_order_cnt_lsb_minus4 : 4;
192 /** \brief Same as the H.264 bitstream syntax element. */
193 unsigned int delta_pic_order_always_zero_flag : 1;
198 /** \brief Same as the H.264 bitstream syntax element. */
199 unsigned char bit_depth_luma_minus8;
200 /** \brief Same as the H.264 bitstream syntax element. */
201 unsigned char bit_depth_chroma_minus8;
203 /** if pic_order_cnt_type == 1 */
205 /** \brief Same as the H.264 bitstream syntax element. */
206 unsigned char num_ref_frames_in_pic_order_cnt_cycle;
207 /** \brief Same as the H.264 bitstream syntax element. */
208 int offset_for_non_ref_pic;
209 /** \brief Same as the H.264 bitstream syntax element. */
210 int offset_for_top_to_bottom_field;
211 /** \brief Same as the H.264 bitstream syntax element. */
212 int offset_for_ref_frame[256];
215 /** @name Cropping (optional) */
217 /** \brief Same as the H.264 bitstream syntax element. */
218 unsigned char frame_cropping_flag;
219 /** \brief Same as the H.264 bitstream syntax element. */
220 unsigned int frame_crop_left_offset;
221 /** \brief Same as the H.264 bitstream syntax element. */
222 unsigned int frame_crop_right_offset;
223 /** \brief Same as the H.264 bitstream syntax element. */
224 unsigned int frame_crop_top_offset;
225 /** \brief Same as the H.264 bitstream syntax element. */
226 unsigned int frame_crop_bottom_offset;
229 /** @name VUI parameters (optional) */
231 /** \brief Same as the H.264 bitstream syntax element. */
232 unsigned char vui_parameters_present_flag;
235 /** \brief Same as the H.264 bitstream syntax element. */
236 unsigned int aspect_ratio_info_present_flag : 1;
237 /** \brief Same as the H.264 bitstream syntax element. */
238 unsigned int timing_info_present_flag : 1;
239 /** \brief Same as the H.264 bitstream syntax element. */
240 unsigned int bitstream_restriction_flag : 1;
241 /** \brief Range: 0 to 16, inclusive. */
242 unsigned int log2_max_mv_length_horizontal : 5;
243 /** \brief Range: 0 to 16, inclusive. */
244 unsigned int log2_max_mv_length_vertical : 5;
248 /** \brief Same as the H.264 bitstream syntax element. */
249 unsigned char aspect_ratio_idc;
250 /** \brief Same as the H.264 bitstream syntax element. */
251 unsigned int sar_width;
252 /** \brief Same as the H.264 bitstream syntax element. */
253 unsigned int sar_height;
254 /** \brief Same as the H.264 bitstream syntax element. */
255 unsigned int num_units_in_tick;
256 /** \brief Same as the H.264 bitstream syntax element. */
257 unsigned int time_scale;
259 } VAEncSequenceParameterBufferH264;
262 * \brief Picture parameter for H.264 encoding in main & high profiles.
264 * This structure holds information for \c pic_parameter_set_rbsp() as
265 * defined by the H.264 specification.
267 * If packed picture headers mode is used, i.e. if the encoding
268 * pipeline was configured with the #VA_ENC_PACKED_HEADER_PICTURE
269 * flag, then the driver expects two more buffers to be provided to
270 * the same \c vaRenderPicture() as this buffer:
271 * - a #VAEncPackedHeaderParameterBuffer with type set to
272 * VAEncPackedHeaderType::VAEncPackedHeaderPicture ;
273 * - a #VAEncPackedHeaderDataBuffer which holds the actual packed
276 * If \c pic_scaling_matrix_present_flag is set to \c 1, then a
277 * #VAIQMatrixBufferH264 buffer shall also be provided within the same
278 * \c vaRenderPicture() call as this picture parameter buffer.
280 typedef struct _VAEncPictureParameterBufferH264 {
282 * \brief Information about the picture to be encoded.
284 * See #VAPictureH264 for further description of each field.
285 * Note that CurrPic.picture_id represents the reconstructed
286 * (decoded) picture. User provides a scratch VA surface ID here.
288 VAPictureH264 CurrPic;
290 * \brief Decoded Picture Buffer (DPB).
292 * This array represents the list of reconstructed (decoded)
293 * frames used as reference. It is important to keep track of
294 * reconstructed frames so that they can be used later on as
295 * reference for P or B-frames encoding.
297 VAPictureH264 ReferenceFrames[16];
299 * \brief Output encoded bitstream.
301 * \ref coded_buf has type #VAEncCodedBufferType. It should be
302 * large enough to hold the compressed NAL slice and possibly SPS
305 VABufferID coded_buf;
307 /** \brief The picture parameter set referred to in the slice header. */
308 unsigned char pic_parameter_set_id;
309 /** \brief The active sequence parameter set. Range: 0 to 31, inclusive. */
310 unsigned char seq_parameter_set_id;
313 * \brief OR'd flags describing whether the picture is the last one or not.
315 * This fields holds 0 if the picture to be encoded is not the last
316 * one in the stream or sequence. Otherwise, it is a combination of
317 * \ref H264_LAST_PICTURE_EOSEQ or \ref H264_LAST_PICTURE_EOSTREAM.
319 unsigned char last_picture;
321 /** \brief The picture identifier.
322 * Range: 0 to \f$2^{log2\_max\_frame\_num\_minus4 + 4} - 1\f$, inclusive.
324 unsigned short frame_num;
326 /** \brief \c pic_init_qp_minus26 + 26. */
327 unsigned char pic_init_qp;
328 /** \brief Maximum reference index for reference picture list 0.
329 * Range: 0 to 31, inclusive.
331 unsigned char num_ref_idx_l0_active_minus1;
332 /** \brief Maximum reference index for reference picture list 1.
333 * Range: 0 to 31, inclusive.
335 unsigned char num_ref_idx_l1_active_minus1;
337 /** \brief Range: -12 to 12, inclusive. */
338 signed char chroma_qp_index_offset;
339 /** \brief Range: -12 to 12, inclusive. */
340 signed char second_chroma_qp_index_offset;
344 /** \brief Is picture an IDR picture? */
345 unsigned int idr_pic_flag : 1;
346 /** \brief Is picture a reference picture? */
347 unsigned int reference_pic_flag : 2;
348 /** \brief Selects CAVLC (0) or CABAC (1) entropy coding mode. */
349 unsigned int entropy_coding_mode_flag : 1;
350 /** \brief Is weighted prediction applied to P slices? */
351 unsigned int weighted_pred_flag : 1;
352 /** \brief Range: 0 to 2, inclusive. */
353 unsigned int weighted_bipred_idc : 2;
354 /** \brief Same as the H.264 bitstream syntax element. */
355 unsigned int constrained_intra_pred_flag : 1;
356 /** \brief Same as the H.264 bitstream syntax element. */
357 unsigned int transform_8x8_mode_flag : 1;
358 /** \brief Same as the H.264 bitstream syntax element. */
359 unsigned int deblocking_filter_control_present_flag : 1;
360 /** \brief Same as the H.264 bitstream syntax element. */
361 unsigned int redundant_pic_cnt_present_flag : 1;
362 /** \brief Same as the H.264 bitstream syntax element. */
363 unsigned int pic_order_present_flag : 1;
364 /** \brief Same as the H.264 bitstream syntax element. */
365 unsigned int pic_scaling_matrix_present_flag : 1;
369 } VAEncPictureParameterBufferH264;
372 * \brief Slice parameter for H.264 encoding in main & high profiles.
374 * This structure holds information for \c
375 * slice_layer_without_partitioning_rbsp() as defined by the H.264
378 * If packed slice headers mode is used, i.e. if the encoding
379 * pipeline was configured with the #VA_ENC_PACKED_HEADER_SLICE
380 * flag, then the driver expects two more buffers to be provided to
381 * the same \c vaRenderPicture() as this buffer:
382 * - a #VAEncPackedHeaderParameterBuffer with type set to
383 * VAEncPackedHeaderType::VAEncPackedHeaderSlice ;
384 * - a #VAEncPackedHeaderDataBuffer which holds the actual packed
387 * If per-macroblock encoder configuration is needed, \c macroblock_info
388 * references a buffer of type #VAEncMacroblockParameterBufferH264. This
389 * buffer is not passed to vaRenderPicture(). i.e. it is not destroyed
390 * by subsequent calls to vaRenderPicture() and then can be re-used
391 * without re-allocating the whole buffer.
393 typedef struct _VAEncSliceParameterBufferH264 {
394 /** \brief Starting MB address for this slice. */
395 unsigned int macroblock_address;
396 /** \brief Number of macroblocks in this slice. */
397 unsigned int num_macroblocks;
399 * \brief Per-MB encoder configuration buffer, or \c VA_INVALID_ID.
401 * If per-MB encoder configuration is needed, then \ref macroblock_info
402 * references a buffer of type #VAEncMacroblockParameterBufferH264
403 * (\c VAEncMacroblockParameterBufferType). Otherwise, buffer id
404 * is set to \c VA_INVALID_ID and per-MB configuration is derived
405 * from this slice parameter.
407 * The \c macroblock_info buffer must hold \ref num_macroblocks
410 VABufferID macroblock_info;
411 /** \brief Slice type.
412 * Range: 0..2, 5..7, i.e. no switching slices.
414 unsigned char slice_type;
415 /** \brief Same as the H.264 bitstream syntax element. */
416 unsigned char pic_parameter_set_id;
417 /** \brief Same as the H.264 bitstream syntax element. */
418 unsigned short idr_pic_id;
420 /** @name If pic_order_cnt_type == 0 */
422 /** \brief The picture order count modulo MaxPicOrderCntLsb. */
423 unsigned short pic_order_cnt_lsb;
424 /** \brief Valid if \c pic_order_present_flag and this is a bottom field. */
425 int delta_pic_order_cnt_bottom;
427 /** @name If pic_order_cnt_type == 1 && !delta_pic_order_always_zero_flag */
429 /** \brief [0]: top, [1]: bottom. */
430 int delta_pic_order_cnt[2];
433 /** @name If slice_type == B */
435 unsigned char direct_spatial_mv_pred_flag;
438 /** @name If slice_type == P */
440 /** \brief Specifies if
441 * \ref _VAEncPictureParameterBufferH264::num_ref_idx_l0_active_minus1 or
442 * \ref _VAEncPictureParameterBufferH264::num_ref_idx_l1_active_minus1 are
443 * overriden by the values for this slice.
445 unsigned char num_ref_idx_active_override_flag;
446 /** \brief Maximum reference index for reference picture list 0.
447 * Range: 0 to 31, inclusive.
449 unsigned char num_ref_idx_l0_active_minus1;
450 /** \brief Maximum reference index for reference picture list 1.
451 * Range: 0 to 31, inclusive.
453 unsigned char num_ref_idx_l1_active_minus1;
454 /** \brief Reference picture list 0 (for P slices). */
455 VAPictureH264 RefPicList0[32];
456 /** \brief Reference picture list 1 (for B slices). */
457 VAPictureH264 RefPicList1[32];
460 /** @name pred_weight_table() */
462 /** \brief Same as the H.264 bitstream syntax element. */
463 unsigned char luma_log2_weight_denom;
464 /** \brief Same as the H.264 bitstream syntax element. */
465 unsigned char chroma_log2_weight_denom;
466 /** \brief Same as the H.264 bitstream syntax element. */
467 unsigned char luma_weight_l0_flag;
468 /** \brief Same as the H.264 bitstream syntax element. */
469 signed short luma_weight_l0[32];
470 /** \brief Same as the H.264 bitstream syntax element. */
471 signed short luma_offset_l0[32];
472 /** \brief Same as the H.264 bitstream syntax element. */
473 unsigned char chroma_weight_l0_flag;
474 /** \brief Same as the H.264 bitstream syntax element. */
475 signed short chroma_weight_l0[32][2];
476 /** \brief Same as the H.264 bitstream syntax element. */
477 signed short chroma_offset_l0[32][2];
478 /** \brief Same as the H.264 bitstream syntax element. */
479 unsigned char luma_weight_l1_flag;
480 /** \brief Same as the H.264 bitstream syntax element. */
481 signed short luma_weight_l1[32];
482 /** \brief Same as the H.264 bitstream syntax element. */
483 signed short luma_offset_l1[32];
484 /** \brief Same as the H.264 bitstream syntax element. */
485 unsigned char chroma_weight_l1_flag;
486 /** \brief Same as the H.264 bitstream syntax element. */
487 signed short chroma_weight_l1[32][2];
488 /** \brief Same as the H.264 bitstream syntax element. */
489 signed short chroma_offset_l1[32][2];
492 /** \brief Range: 0 to 2, inclusive. */
493 unsigned char cabac_init_idc;
494 /** \brief Same as the H.264 bitstream syntax element. */
495 signed char slice_qp_delta;
496 /** @name If deblocking_filter_control_present_flag */
498 /** \brief Range: 0 to 2, inclusive. */
499 unsigned char disable_deblocking_filter_idc;
500 /** \brief Same as the H.264 bitstream syntax element. */
501 signed char slice_alpha_c0_offset_div2;
502 /** \brief Same as the H.264 bitstream syntax element. */
503 signed char slice_beta_offset_div2;
505 } VAEncSliceParameterBufferH264;
508 * @name Macroblock neighbour availability bits
510 * \anchor api_enc_h264_mb_pred_avail_bits
511 * Definitions for macroblock neighbour availability bits used in
512 * intra prediction mode (non MBAFF only).
516 /** \brief References macroblock in the top-left corner. */
517 #define VA_MB_PRED_AVAIL_TOP_LEFT (1 << 2)
518 /** \brief References macroblock above the current macroblock. */
519 #define VA_MB_PRED_AVAIL_TOP (1 << 4)
520 /** \brief References macroblock in the top-right corner. */
521 #define VA_MB_PRED_AVAIL_TOP_RIGHT (1 << 3)
522 /** \brief References macroblock on the left of the current macroblock. */
523 #define VA_MB_PRED_AVAIL_LEFT (1 << 6)
527 * \brief Macroblock parameter for H.264 encoding in main & high profiles.
529 * This structure holds per-macroblock information. The buffer must be
530 * allocated with as many elements (macroblocks) as necessary to fit
531 * the slice to be encoded. Besides, the per-macroblock records must
532 * be written in a strict raster order and with no gap. i.e. every
533 * macroblock, regardless of its type, shall have an entry.
535 typedef struct _VAEncMacroblockParameterBufferH264 {
537 * \brief Quantization parameter.
539 * Requested quantization parameter. Range: 0 to 51, inclusive.
540 * If \ref qp is set to 0xff, then the actual value is derived
541 * from the slice-level value: \c pic_init_qp + \c slice_qp_delta.
546 /** @name Data for intra macroblock */
551 * \brief Flag specified to override MB neighbour
552 * availability bits from VME stage.
554 * This flag specifies that macroblock neighbour
555 * availability bits from the VME stage are overriden
556 * by the \ref pred_avail_flags hereunder.
558 unsigned int pred_avail_override_flag : 1;
560 * \brief Bitwise representation of which macroblocks
561 * are available for intra prediction.
563 * If the slice is intra-coded, this field represents
564 * the macroblocks available for intra prediction.
565 * See \ref api_enc_h264_mb_pred_avail_bits
566 * "macroblock neighbour availability" bit definitions.
568 unsigned int pred_avail_flags : 8;
574 /** @name Data for inter macroblock */
583 } VAEncMacroblockParameterBufferH264;
585 /** \brief Bitstream writer attribute types specific to H.264 encoding. */
588 * \brief Flag: specifies whether to insert emulation prevention
591 VAEncBitstreamAttribEmulationPreventionH264 = (
592 VAEncBitstreamAttribMiscMask | 1),
593 } VAEncBitstreamAttribTypeH264;
596 * \brief Allocates a new H.264 bitstream writer.
598 * Allocates a new bitstream writer. By default, libva allocates and
599 * maintains its own buffer. However, the user can pass down his own
600 * buffer with the \c VAEncBitstreamAttribBuffer attribute, along with
601 * the size of that buffer with the \c VAEncBitstreamAttribBufferSize
604 * By default, emulation prevention bytes are not inserted. However,
605 * the user can still request emulation prevention by setting the
606 * \c VAEncBitstreamAttribEmulationPreventionH264 attribute to 1.
608 * @param[in] attribs the optional attributes, or NULL
609 * @param[in] num_attribs the number of attributes available in \c attribs
610 * @return a new #VAEncBitstream, or NULL if an error occurred
613 va_enc_bitstream_h264_new(
614 VAEncBitstreamAttrib *attribs,
615 unsigned int num_attribs
619 * \brief Destroys an H.264 bitstream writer.
621 * @param[in] bs the bitstream writer to destroy
624 va_enc_bitstream_h264_destroy(VAEncBitstream *bs);
627 * \brief Writes an unsigned integer as \c ue(v).
629 * Writes a 32-bit unsigned int value by following \c ue(v) from the
630 * H.264 specification.
632 * @param[in] bs the bitstream writer
633 * @param[in] value the unsigned int value
634 * @return the number of bits written, or a negative value to indicate an error
637 va_enc_bitstream_h264_write_ue(VAEncBitstream *bs, unsigned int value);
640 * \brief Writes a signed integer as \c se(v).
642 * Writes a 32-bit signed int value by following \c se(v) from the
643 * H.264 specification.
645 * @param[in] bs the bitstream writer
646 * @param[in] value the signed int value
647 * @return the number of bits written, or a negative value to indicate an error
650 va_enc_bitstream_h264_write_se(VAEncBitstream *bs, int value);
653 * \brief Helper function to write trailing bits into the bitstream.
655 * @param[in] bs the bitstream writer
656 * @return the number of bits written, or a negative value to indicate an error
659 va_enc_bitstream_h264_write_trailing_bits(VAEncBitstream *bs);
667 #endif /* VA_ENC_H264_H */