/******************************************************************************
 *
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *****************************************************************************
 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/

/**
*******************************************************************************
* @file
*  ih264e_process.h
*
* @brief
*  Contains functions for codec thread
*
* @author
*  ittiam
*
* @remarks
*  None
*
*******************************************************************************
*/

#ifndef IH264E_PROCESS_H_
#define IH264E_PROCESS_H_

/*****************************************************************************/
/* Function Declarations                                                     */
/*****************************************************************************/

/**
******************************************************************************
*
*  @brief This function generates sps, pps set on request
*
*  @par   Description
*  When the encoder is set in header generation mode, the following function
*  is called. This generates sps and pps headers and returns the control back
*  to caller.
*
*  @param[in]    ps_codec
*  pointer to codec context
*
*  @return      success or failure error code
*
******************************************************************************
*/
IH264E_ERROR_T    ih264e_generate_sps_pps
        (
            codec_t   *ps_codec
        );

/**
*******************************************************************************
*
* @brief   initialize entropy context.
*
* @par Description:
*  Before invoking the call to perform to entropy coding the entropy context
*  associated with the job needs to be initialized. This involves the start
*  mb address, end mb address, slice index and the pointer to location at
*  which the mb residue info and mb header info are packed.
*
* @param[in] ps_proc
*  Pointer to the current process context
*
* @returns error status
*
* @remarks none
*
*******************************************************************************
*/
IH264E_ERROR_T ih264e_init_entropy_ctxt(process_ctxt_t *ps_proc);

/**
*******************************************************************************
*
* @brief entry point for entropy coding
*
* @par Description
*  This function calls lower level functions to perform entropy coding for a
*  group (n rows) of mb's. After encoding 1 row of mb's,  the function takes
*  back the control, updates the ctxt and calls lower level functions again.
*  This process is repeated till all the rows or group of mb's (which ever is
*  minimum) are coded
*
* @param[in] ps_proc
*  process context
*
* @returns  error status
*
* @remarks
* NOTE : It is assumed that this routine is invoked at the start of a slice,
* so the slice header is generated by default.
*
*******************************************************************************
*/
IH264E_ERROR_T ih264e_entropy(process_ctxt_t *ps_proc);

/**
*******************************************************************************
*
* @brief Packs header information of a mb in to a buffer
*
* @par Description:
*  After the deciding the mode info of a macroblock, the syntax elements
*  associated with the mb are packed and stored. The entropy thread unpacks
*  this buffer and generates the end bit stream.
*
* @param[in] ps_proc
*  Pointer to the current process context
*
* @returns error status
*
* @remarks none
*
*******************************************************************************
*/
IH264E_ERROR_T ih264e_pack_header_data
    (
        process_ctxt_t *ps_proc
    );

/**
*******************************************************************************
*
* @brief   update process context after encoding an mb. This involves preserving
* the current mb information for later use, initialize the proc ctxt elements to
* encode next mb.
*
* @par Description:
*  This function performs house keeping tasks after encoding an mb.
*  After encoding an mb, various elements of the process context needs to be
*  updated to encode the next mb. For instance, the source, recon and reference
*  pointers, mb indices have to be adjusted to the next mb. The slice index of
*  the current mb needs to be updated. If mb qp modulation is enabled, then if
*  the qp changes the quant param structure needs to be updated. Also to encoding
*  the next mb, the current mb info is used as part of mode prediction or mv
*  prediction. Hence the current mb info has to preserved at top/top left/left
*  locations.
*
* @param[in] ps_proc
*  Pointer to the current process context
*
* @returns none
*
* @remarks none
*
*******************************************************************************
*/
WORD32 ih264e_update_proc_ctxt
    (
        process_ctxt_t *ps_proc
    );

/**
*******************************************************************************
*
* @brief   initialize process context.
*
* @par Description:
*  Before dispatching the current job to process thread, the process context
*  associated with the job is initialized. Usually every job aims to encode one
*  row of mb's. Basing on the row indices provided by the job, the process
*  context's buffer ptrs, slice indices and other elements that are necessary
*  during core-coding are initialized.
*
* @param[in] ps_proc
*  Pointer to the current process context
*
* @returns error status
*
* @remarks none
*
*******************************************************************************
*/
IH264E_ERROR_T ih264e_init_proc_ctxt(process_ctxt_t *ps_proc);

/**
*******************************************************************************
*
* @brief This function performs luma & chroma padding
*
* @par Description:
*
* @param[in] ps_proc
*  Process context corresponding to the job
*
* @param[in] pu1_curr_pic_luma
*  Pointer to luma buffer
*
* @param[in] pu1_curr_pic_chroma
*  Pointer to chroma buffer
*
* @param[in] i4_mb_x
*  mb index x
*
* @param[in] i4_mb_y
*  mb index y
*
* @param[in] i4_pad_ht
*  number of rows to be padded
*
* @returns  error status
*
* @remarks none
*
*******************************************************************************
*/
IH264E_ERROR_T ih264e_pad_recon_buffer
    (
        process_ctxt_t *ps_proc,
        UWORD8 *pu1_curr_pic_luma,
        UWORD8 *pu1_curr_pic_chroma,
        WORD32 i4_mb_x,
        WORD32 i4_mb_y,
        WORD32 i4_pad_ht
    );

/**
*******************************************************************************
*
* @brief This function performs luma half pel planes generation
*
* @par Description:
*
* @param[in] ps_proc
*  Process context corresponding to the job
*
* @returns  error status
*
* @remarks none
*
*******************************************************************************
*/
IH264E_ERROR_T ih264e_halfpel_generation
    (
        process_ctxt_t *ps_proc,
        UWORD8 *pu1_curr_pic_luma,
        WORD32 i4_mb_x,
        WORD32 i4_mb_y
    );

/**
*******************************************************************************
*
* @brief This function performs luma & chroma core coding for a set of mb's.
*
* @par Description:
*  The mb to be coded is taken and is evaluated over a predefined set of modes
*  (intra (i16, i4, i8)/inter (mv, skip)) for best cost. The mode with least cost
*  is selected and using intra/inter prediction filters, prediction is carried out.
*  The deviation between src and pred signal constitutes error signal. This error
*  signal is transformed (hierarchical transform if necessary) and quantized. The
*  quantized residue is packed in to entropy buffer for entropy coding. This is
*  repeated for all the mb's enlisted under the job.
*
* @param[in] ps_proc
*  Process context corresponding to the job
*
* @returns  error status
*
* @remarks none
*
*******************************************************************************
*/
WORD32 ih264e_process(process_ctxt_t *ps_proc);

/**
*******************************************************************************
*
* @brief
*  function to receive frame qp and pic type before encoding
*
* @par Description:
*  Before encoding the frame, this function calls the rc library for frame qp
*  and picture type
*
* @param[in] ps_codec
*  Pointer to codec context
*
* @param[in] pic_cnt
*  pic count
*
* @param[out] pi4_pic_type
*  pic type

* @returns skip_src
*  if the source frame rate and target frame rate are not identical, the encoder
*  skips few source frames. skip_src is set when the source need not be encoded.
*
* @remarks none
*
*******************************************************************************
*/
WORD32 ih264e_set_rc_pic_params(codec_t *ps_codec, WORD32 cur_pic_cnt, WORD32 *pi4_pic_type);


/**
*******************************************************************************
*
* @brief
*  Function to update rc context after encoding
*
* @par   Description
*  This function updates the rate control context after the frame is encoded.
*  Number of bits consumed by the current frame, frame distortion, frame cost,
*  number of intra/inter mb's, ... are passed on to rate control context for
*  updating the rc model.
*
* @param[in] ps_codec
*  Handle to codec context
*
* @param[in] ctxt_sel
*  frame context selector
*
* @param[in] pic_cnt
*  pic count
*
* @returns i4_stuffing_byte
*  number of stuffing bytes (if necessary)
*
* @remarks
*
*******************************************************************************
*/
WORD32 ih264e_update_rc_post_enc(codec_t *ps_codec, WORD32 ctxt_sel, WORD32 pic_cnt);

/**
*******************************************************************************
*
* @brief
*  entry point of a spawned encoder thread
*
* @par Description:
*  The encoder thread dequeues a proc/entropy job from the encoder queue and
*  calls necessary routines.
*
* @param[in] pv_proc
*  Process context corresponding to the thread
*
* @returns  error status
*
* @remarks
*
*******************************************************************************
*/
WORD32 ih264e_process_thread(void *pv_proc);

#endif /* IH264E_PROCESS_H_ */