/src/libhevc/decoder/ihevcd_nal.c

Source
/******************************************************************************
*
* Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore
*
* 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.
*
******************************************************************************/
/**
*******************************************************************************
* @file
*  ihevcd_nal.c
*
* @brief
*  Contains functions for NAL level such as search start code etc
*
* @author
*  Harish
*
* @par List of Functions:
*
* @remarks
*  None
*
*******************************************************************************
*/
/*****************************************************************************/
/* File Includes                                                             */
/*****************************************************************************/
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include "ihevc_typedefs.h"
#include "iv.h"
#include "ivd.h"
#include "ihevcd_cxa.h"

#include "ihevc_defs.h"
#include "ihevc_debug.h"
#include "ihevc_structs.h"
#include "ihevc_macros.h"
#include "ihevc_platform_macros.h"
#include "ihevc_cabac_tables.h"


#include "ihevcd_defs.h"
#include "ihevcd_function_selector.h"
#include "ihevcd_structs.h"
#include "ihevcd_error.h"
#include "ihevcd_nal.h"
#include "ihevcd_bitstream.h"
#include "ihevcd_parse_headers.h"
#include "ihevcd_parse_slice.h"
#include "ihevcd_debug.h"
/*****************************************************************************/
/* Function Prototypes                                                       */
/*****************************************************************************/

/**
*******************************************************************************
*
* @brief
*  Search start code from the given buffer pointer
*
* @par Description:
*  Search for start code  Return the offset of start code if start code is
* found  If no start code is found till end of given bitstream  then treat
* it as invalid NAL and return end of buffer as  offset
*
* @param[in] pu1_buf
*  Pointer to bitstream
*
* @param[in] bytes_remaining
*  Number of bytes remaining in the buffer
*
* @returns  Offset to the first byte in NAL after start code
*
* @remarks
*  Incomplete start code at the end of input bitstream is  not handled. This
* has to be taken care outside this func
*
*******************************************************************************
*/
WORD32 ihevcd_nal_search_start_code(UWORD8 *pu1_buf, WORD32 bytes_remaining)
{
    WORD32 ofst;

    WORD32 zero_byte_cnt;
    WORD32 start_code_found;

    ofst = -1;

    zero_byte_cnt = 0;
    start_code_found = 0;
    while(ofst < (bytes_remaining - 1))
    {
        ofst++;
        if(pu1_buf[ofst] != 0)
        {
            zero_byte_cnt = 0;
            continue;
        }

        zero_byte_cnt++;
        if((ofst < (bytes_remaining - 1)) &&
           (pu1_buf[ofst + 1] == START_CODE_PREFIX_BYTE) &&
           (zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE))
        {
            /* Found the start code */
            ofst++;
            start_code_found = 1;
            break;
        }
    }
    if((0 == start_code_found) && (ofst < bytes_remaining))
    {
        if((START_CODE_PREFIX_BYTE == pu1_buf[ofst]) &&
           (zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE))
        {
            /* Found a start code at the end*/
            ofst++;
        }
    }
    /* Since ofst started at -1, increment it by 1 */
    ofst++;

    return ofst;
}

/**
*******************************************************************************
*
* @brief
*  Remove emulation prevention byte present in the bitstream till next start
* code is found. Emulation prevention byte  removed data is stored in a
* different buffer
*
* @par Description:
*  Assumption is first start code is already found and  pu1_buf is pointing
* to a byte after the start code  Search for Next NAL's start code  Return
* if start code is found  Remove any emulation prevention byte present  Copy
* data to new buffer  If no start code is found, then treat complete buffer
* as  one nal.
*
* @param[in] pu1_src
*  Pointer to bitstream (excludes the initial the start code)
*
* @param[in] pu1_dst
*  Pointer to destination buffer
*
* @param[in] bytes_remaining
*  Number of bytes remaining
*
* @param[out] pi4_nal_len
*  NAL length (length of bitstream parsed)
*
* @param[out] pi4_dst_len
*  Destination bitstream size (length of bitstream parsed with emulation bytes
* removed)
*
* @returns Error code from IHEVCD_ERROR_T
*
* @remarks
*  Incomplete start code at the end of input bitstream is  not handled. This
* has to be taken care outside this func
*
*******************************************************************************
*/
IHEVCD_ERROR_T ihevcd_nal_remv_emuln_bytes(UWORD8 *pu1_src,
                                           UWORD8 *pu1_dst,
                                           WORD32 bytes_remaining,
                                           WORD32 *pi4_nal_len,
                                           WORD32 *pi4_dst_len)
{
    WORD32 src_cnt;
    WORD32 dst_cnt;
    WORD32 zero_byte_cnt;
    WORD32 start_code_found;
    UWORD8 u1_src;
    IHEVCD_ERROR_T ret = (IHEVCD_ERROR_T)IHEVCD_SUCCESS;

    src_cnt = 0;
    dst_cnt = 0;
    zero_byte_cnt = 0;
    start_code_found = 0;
    while(src_cnt < (bytes_remaining - 1))
    {
        u1_src = pu1_src[src_cnt++];

        pu1_dst[dst_cnt++] = u1_src;
        if(u1_src != 0)
        {
            zero_byte_cnt = 0;
            continue;
        }

        zero_byte_cnt++;
        if(zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE)
        {
            u1_src = pu1_src[src_cnt];
            if(START_CODE_PREFIX_BYTE == u1_src)
            {
                /* Found the start code */
                src_cnt -= zero_byte_cnt;
                dst_cnt -= zero_byte_cnt;
                start_code_found = 1;
                break;
            }
            else if(EMULATION_PREVENT_BYTE == u1_src)
            {
                /* Found the emulation prevention byte */
                src_cnt++;
                zero_byte_cnt = 0;

                /* Decrement dst_cnt so that the next byte overwrites
                 * the emulation prevention byte already copied to dst above
                 */
            }
        }

    }

    if((0 == start_code_found) && (src_cnt < bytes_remaining))
    {
        u1_src = pu1_src[src_cnt++];
        if(zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE)
        {

            if(START_CODE_PREFIX_BYTE == u1_src)
            {
                /* Found a start code at the end*/
                src_cnt -= zero_byte_cnt;
            }
            else if(EMULATION_PREVENT_BYTE == u1_src)
            {
                /* Found the emulation prevention byte at the end*/
                src_cnt++;
                /* Decrement dst_cnt so that the next byte overwrites
                 * the emulation prevention byte already copied to dst above
                 */
                dst_cnt--;
            }
        }
        else
        {
            pu1_dst[dst_cnt++] = u1_src;
        }


    }
    *pi4_nal_len = src_cnt;
    *pi4_dst_len = dst_cnt;
    return ret;
}
/**
*******************************************************************************
*
* @brief
*  Decode given NAL unit's header
*
* @par Description:
*  Call NAL unit's header decode  Section: 7.3.1.2
*
* @param[in] ps_bitstrm
*  Pointer to bitstream context
*
* @param[out] ps_nal
*  Pointer to NAL header
*
* @returns Error code from IHEVCD_ERROR_T
*
* @remarks
*
*
*******************************************************************************
*/
IHEVCD_ERROR_T ihevcd_nal_unit_header(bitstrm_t *ps_bitstrm, nal_header_t *ps_nal)
{
    WORD32 unused;
    IHEVCD_ERROR_T ret = (IHEVCD_ERROR_T)IHEVCD_SUCCESS;
    UNUSED(unused);
    /* Syntax : forbidden_zero_bit */
    unused = ihevcd_bits_get(ps_bitstrm, 1);

    /* Syntax : nal_unit_type */
    ps_nal->i1_nal_unit_type = ihevcd_bits_get(ps_bitstrm, 6);

    /* Syntax : nuh_reserved_zero_6bits */
    unused = ihevcd_bits_get(ps_bitstrm, 6);

    /* Syntax : nuh_temporal_id_plus1 */
    ps_nal->i1_nuh_temporal_id = (WORD32)ihevcd_bits_get(ps_bitstrm, 3) - 1;

    return ret;

}

/**
*******************************************************************************
*
* @brief
*  Decode given NAL
*
* @par Description:
*  Based on the NAL type call appropriate decode function  Section: 7.3.1.1
*
*
* @param[in,out] ps_codec
*  Pointer to codec context (Functions called within will modify contents of
* ps_codec)
*
* @returns Error code from IHEVCD_ERROR_T
*
* @remarks
*
*
*******************************************************************************
*/
IHEVCD_ERROR_T ihevcd_nal_unit(codec_t *ps_codec)
{
    IHEVCD_ERROR_T ret = (IHEVCD_ERROR_T)IHEVCD_SUCCESS;

    /* NAL Header */
    nal_header_t s_nal;

    ret = ihevcd_nal_unit_header(&ps_codec->s_parse.s_bitstrm, &s_nal);
    RETURN_IF((ret != (IHEVCD_ERROR_T)IHEVCD_SUCCESS), ret);

    if(ps_codec->i4_slice_error)
        s_nal.i1_nal_unit_type = ps_codec->s_parse.ps_slice_hdr->i1_nal_unit_type;

    /* Setting RASL Output flag */
    switch(s_nal.i1_nal_unit_type)
    {
        case NAL_BLA_W_LP    :
        case NAL_BLA_W_DLP   :
        case NAL_BLA_N_LP    :
            ps_codec->i4_rasl_output_flag = 0;
            break;

        //TODO: After IDR, there is no case of open GOP
        //To be fixed appropriately by ignoring RASL only if the
        // required references are not found
        case NAL_IDR_W_LP    :
        case NAL_IDR_N_LP    :
            ps_codec->i4_rasl_output_flag = 1;
            break;

        case NAL_CRA         :
            ps_codec->i4_rasl_output_flag = (0 != ps_codec->i4_cra_as_first_pic) ? 0 : 1;
            break;

        default:
            break;
    }

    switch(s_nal.i1_nal_unit_type)
    {
        case NAL_BLA_W_LP    :
        case NAL_BLA_W_DLP   :
        case NAL_BLA_N_LP    :
        case NAL_IDR_W_LP    :
        case NAL_IDR_N_LP    :
        case NAL_CRA         :
        case NAL_TRAIL_N     :
        case NAL_TRAIL_R     :
        case NAL_TSA_N       :
        case NAL_TSA_R       :
        case NAL_STSA_N      :
        case NAL_STSA_R      :
        case NAL_RADL_N      :
        case NAL_RADL_R      :
        case NAL_RASL_N      :
        case NAL_RASL_R      :
            if(ps_codec->i4_header_mode)
                return IHEVCD_SLICE_IN_HEADER_MODE;

            if((0 == ps_codec->i4_sps_done) ||
                            (0 == ps_codec->i4_pps_done))
            {
                return IHEVCD_INVALID_HEADER;
            }

            ps_codec->i4_header_in_slice_mode = 0;
            ps_codec->i4_cra_as_first_pic = 0;

            ret = ihevcd_parse_slice_header(ps_codec, &s_nal);
            DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type);
            if(ret == (IHEVCD_ERROR_T)IHEVCD_SUCCESS)
            {
                if((s_nal.i1_nal_unit_type != NAL_RASL_N && s_nal.i1_nal_unit_type != NAL_RASL_R) ||
                                ps_codec->i4_rasl_output_flag ||
                                ps_codec->i4_slice_error)
                    ret = ihevcd_parse_slice_data(ps_codec);
            }
            break;

        case NAL_VPS        :
            // ret = ihevcd_parse_vps(ps_codec);
            DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type);
            break;

        case NAL_SPS        :
            if(0 == ps_codec->i4_header_mode)
            {
                ps_codec->i4_header_in_slice_mode = 1;
                if(ps_codec->i4_sps_done &&
                                ps_codec->i4_pic_present)
                    break;
            }

            ret = ihevcd_parse_sps(ps_codec);
            if(ret == (IHEVCD_ERROR_T)IHEVCD_SUCCESS)
            {
                sps_t *ps_sps = ps_codec->ps_sps_base + MAX_SPS_CNT - 1;
                ihevcd_copy_sps(ps_codec, ps_sps->i1_sps_id, MAX_SPS_CNT - 1);
            }
            ps_codec->i4_error_code = ret;

            DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type);
            break;

        case NAL_PPS        :
            if(0 == ps_codec->i4_header_mode)
            {
                ps_codec->i4_header_in_slice_mode = 1;
                if(ps_codec->i4_pps_done &&
                                ps_codec->i4_pic_present)
                    break;
            }

            ret = ihevcd_parse_pps(ps_codec);
            if(ret == (IHEVCD_ERROR_T)IHEVCD_SUCCESS)
            {
                pps_t *ps_pps = ps_codec->ps_pps_base + MAX_PPS_CNT - 1;
                ihevcd_copy_pps(ps_codec, ps_pps->i1_pps_id, MAX_PPS_CNT - 1);
            }
            ps_codec->i4_error_code = ret;
            DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type);
            break;

#ifndef DISABLE_SEI
        case NAL_PREFIX_SEI:
        case NAL_SUFFIX_SEI:
            if(IVD_DECODE_HEADER == ps_codec->i4_header_mode)
            {
                return IHEVCD_SLICE_IN_HEADER_MODE;
            }

            ret = ihevcd_parse_sei(ps_codec, &s_nal);
            break;

#endif
        case NAL_EOS        :
            ps_codec->i4_cra_as_first_pic = 1;
            break;

        default:
            DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type);
            break;
    }

    return ret;
}


Coverage Report

Created: 2026-06-13 06:22

Line	Count	Source
1		/******************************************************************************
2		*
3		* Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore
4		*
5		* Licensed under the Apache License, Version 2.0 (the "License");
6		* you may not use this file except in compliance with the License.
7		* You may obtain a copy of the License at:
8		*
9		* http://www.apache.org/licenses/LICENSE-2.0
10		*
11		* Unless required by applicable law or agreed to in writing, software
12		* distributed under the License is distributed on an "AS IS" BASIS,
13		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14		* See the License for the specific language governing permissions and
15		* limitations under the License.
16		*
17		******************************************************************************/
18		/**
19		*******************************************************************************
20		* @file
21		* ihevcd_nal.c
22		*
23		* @brief
24		* Contains functions for NAL level such as search start code etc
25		*
26		* @author
27		* Harish
28		*
29		* @par List of Functions:
30		*
31		* @remarks
32		* None
33		*
34		*******************************************************************************
35		*/
36		/*****************************************************************************/
37		/* File Includes */
38		/*****************************************************************************/
39		#include <stdio.h>
40		#include <stddef.h>
41		#include <stdlib.h>
42		#include <string.h>
43		#include <assert.h>
44
45		#include "ihevc_typedefs.h"
46		#include "iv.h"
47		#include "ivd.h"
48		#include "ihevcd_cxa.h"
49
50		#include "ihevc_defs.h"
51		#include "ihevc_debug.h"
52		#include "ihevc_structs.h"
53		#include "ihevc_macros.h"
54		#include "ihevc_platform_macros.h"
55		#include "ihevc_cabac_tables.h"
56
57
58		#include "ihevcd_defs.h"
59		#include "ihevcd_function_selector.h"
60		#include "ihevcd_structs.h"
61		#include "ihevcd_error.h"
62		#include "ihevcd_nal.h"
63		#include "ihevcd_bitstream.h"
64		#include "ihevcd_parse_headers.h"
65		#include "ihevcd_parse_slice.h"
66		#include "ihevcd_debug.h"
67		/*****************************************************************************/
68		/* Function Prototypes */
69		/*****************************************************************************/
70
71		/**
72		*******************************************************************************
73		*
74		* @brief
75		* Search start code from the given buffer pointer
76		*
77		* @par Description:
78		* Search for start code Return the offset of start code if start code is
79		* found If no start code is found till end of given bitstream then treat
80		* it as invalid NAL and return end of buffer as offset
81		*
82		* @param[in] pu1_buf
83		* Pointer to bitstream
84		*
85		* @param[in] bytes_remaining
86		* Number of bytes remaining in the buffer
87		*
88		* @returns Offset to the first byte in NAL after start code
89		*
90		* @remarks
91		* Incomplete start code at the end of input bitstream is not handled. This
92		* has to be taken care outside this func
93		*
94		*******************************************************************************
95		*/
96		WORD32 ihevcd_nal_search_start_code(UWORD8 *pu1_buf, WORD32 bytes_remaining)
97	0	{
98	0	WORD32 ofst;
99
100	0	WORD32 zero_byte_cnt;
101	0	WORD32 start_code_found;
102
103	0	ofst = -1;
104
105	0	zero_byte_cnt = 0;
106	0	start_code_found = 0;
107	0	while(ofst < (bytes_remaining - 1))
108	0	{
109	0	ofst++;
110	0	if(pu1_buf[ofst] != 0)
111	0	{
112	0	zero_byte_cnt = 0;
113	0	continue;
114	0	}
115
116	0	zero_byte_cnt++;
117	0	if((ofst < (bytes_remaining - 1)) &&
118	0	(pu1_buf[ofst + 1] == START_CODE_PREFIX_BYTE) &&
119	0	(zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE))
120	0	{
121		/* Found the start code */
122	0	ofst++;
123	0	start_code_found = 1;
124	0	break;
125	0	}
126	0	}
127	0	if((0 == start_code_found) && (ofst < bytes_remaining))
128	0	{
129	0	if((START_CODE_PREFIX_BYTE == pu1_buf[ofst]) &&
130	0	(zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE))
131	0	{
132		/* Found a start code at the end*/
133	0	ofst++;
134	0	}
135	0	}
136		/* Since ofst started at -1, increment it by 1 */
137	0	ofst++;
138
139	0	return ofst;
140	0	}
141
142		/**
143		*******************************************************************************
144		*
145		* @brief
146		* Remove emulation prevention byte present in the bitstream till next start
147		* code is found. Emulation prevention byte removed data is stored in a
148		* different buffer
149		*
150		* @par Description:
151		* Assumption is first start code is already found and pu1_buf is pointing
152		* to a byte after the start code Search for Next NAL's start code Return
153		* if start code is found Remove any emulation prevention byte present Copy
154		* data to new buffer If no start code is found, then treat complete buffer
155		* as one nal.
156		*
157		* @param[in] pu1_src
158		* Pointer to bitstream (excludes the initial the start code)
159		*
160		* @param[in] pu1_dst
161		* Pointer to destination buffer
162		*
163		* @param[in] bytes_remaining
164		* Number of bytes remaining
165		*
166		* @param[out] pi4_nal_len
167		* NAL length (length of bitstream parsed)
168		*
169		* @param[out] pi4_dst_len
170		* Destination bitstream size (length of bitstream parsed with emulation bytes
171		* removed)
172		*
173		* @returns Error code from IHEVCD_ERROR_T
174		*
175		* @remarks
176		* Incomplete start code at the end of input bitstream is not handled. This
177		* has to be taken care outside this func
178		*
179		*******************************************************************************
180		*/
181		IHEVCD_ERROR_T ihevcd_nal_remv_emuln_bytes(UWORD8 *pu1_src,
182		UWORD8 *pu1_dst,
183		WORD32 bytes_remaining,
184		WORD32 *pi4_nal_len,
185		WORD32 *pi4_dst_len)
186	0	{
187	0	WORD32 src_cnt;
188	0	WORD32 dst_cnt;
189	0	WORD32 zero_byte_cnt;
190	0	WORD32 start_code_found;
191	0	UWORD8 u1_src;
192	0	IHEVCD_ERROR_T ret = (IHEVCD_ERROR_T)IHEVCD_SUCCESS;
193
194	0	src_cnt = 0;
195	0	dst_cnt = 0;
196	0	zero_byte_cnt = 0;
197	0	start_code_found = 0;
198	0	while(src_cnt < (bytes_remaining - 1))
199	0	{
200	0	u1_src = pu1_src[src_cnt++];
201
202	0	pu1_dst[dst_cnt++] = u1_src;
203	0	if(u1_src != 0)
204	0	{
205	0	zero_byte_cnt = 0;
206	0	continue;
207	0	}
208
209	0	zero_byte_cnt++;
210	0	if(zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE)
211	0	{
212	0	u1_src = pu1_src[src_cnt];
213	0	if(START_CODE_PREFIX_BYTE == u1_src)
214	0	{
215		/* Found the start code */
216	0	src_cnt -= zero_byte_cnt;
217	0	dst_cnt -= zero_byte_cnt;
218	0	start_code_found = 1;
219	0	break;
220	0	}
221	0	else if(EMULATION_PREVENT_BYTE == u1_src)
222	0	{
223		/* Found the emulation prevention byte */
224	0	src_cnt++;
225	0	zero_byte_cnt = 0;
226
227		/* Decrement dst_cnt so that the next byte overwrites
228		* the emulation prevention byte already copied to dst above
229		*/
230	0	}
231	0	}
232
233	0	}
234
235	0	if((0 == start_code_found) && (src_cnt < bytes_remaining))
236	0	{
237	0	u1_src = pu1_src[src_cnt++];
238	0	if(zero_byte_cnt >= NUM_ZEROS_BEFORE_START_CODE)
239	0	{
240
241	0	if(START_CODE_PREFIX_BYTE == u1_src)
242	0	{
243		/* Found a start code at the end*/
244	0	src_cnt -= zero_byte_cnt;
245	0	}
246	0	else if(EMULATION_PREVENT_BYTE == u1_src)
247	0	{
248		/* Found the emulation prevention byte at the end*/
249	0	src_cnt++;
250		/* Decrement dst_cnt so that the next byte overwrites
251		* the emulation prevention byte already copied to dst above
252		*/
253	0	dst_cnt--;
254	0	}
255	0	}
256	0	else
257	0	{
258	0	pu1_dst[dst_cnt++] = u1_src;
259	0	}
260
261
262	0	}
263	0	*pi4_nal_len = src_cnt;
264	0	*pi4_dst_len = dst_cnt;
265	0	return ret;
266	0	}
267		/**
268		*******************************************************************************
269		*
270		* @brief
271		* Decode given NAL unit's header
272		*
273		* @par Description:
274		* Call NAL unit's header decode Section: 7.3.1.2
275		*
276		* @param[in] ps_bitstrm
277		* Pointer to bitstream context
278		*
279		* @param[out] ps_nal
280		* Pointer to NAL header
281		*
282		* @returns Error code from IHEVCD_ERROR_T
283		*
284		* @remarks
285		*
286		*
287		*******************************************************************************
288		*/
289		IHEVCD_ERROR_T ihevcd_nal_unit_header(bitstrm_t ps_bitstrm, nal_header_t ps_nal)
290	0	{
291	0	WORD32 unused;
292	0	IHEVCD_ERROR_T ret = (IHEVCD_ERROR_T)IHEVCD_SUCCESS;
293	0	UNUSED(unused);
294		/* Syntax : forbidden_zero_bit */
295	0	unused = ihevcd_bits_get(ps_bitstrm, 1);
296
297		/* Syntax : nal_unit_type */
298	0	ps_nal->i1_nal_unit_type = ihevcd_bits_get(ps_bitstrm, 6);
299
300		/* Syntax : nuh_reserved_zero_6bits */
301	0	unused = ihevcd_bits_get(ps_bitstrm, 6);
302
303		/* Syntax : nuh_temporal_id_plus1 */
304	0	ps_nal->i1_nuh_temporal_id = (WORD32)ihevcd_bits_get(ps_bitstrm, 3) - 1;
305
306	0	return ret;
307
308	0	}
309
310		/**
311		*******************************************************************************
312		*
313		* @brief
314		* Decode given NAL
315		*
316		* @par Description:
317		* Based on the NAL type call appropriate decode function Section: 7.3.1.1
318		*
319		*
320		* @param[in,out] ps_codec
321		* Pointer to codec context (Functions called within will modify contents of
322		* ps_codec)
323		*
324		* @returns Error code from IHEVCD_ERROR_T
325		*
326		* @remarks
327		*
328		*
329		*******************************************************************************
330		*/
331		IHEVCD_ERROR_T ihevcd_nal_unit(codec_t *ps_codec)
332	0	{
333	0	IHEVCD_ERROR_T ret = (IHEVCD_ERROR_T)IHEVCD_SUCCESS;
334
335		/* NAL Header */
336	0	nal_header_t s_nal;
337
338	0	ret = ihevcd_nal_unit_header(&ps_codec->s_parse.s_bitstrm, &s_nal);
339	0	RETURN_IF((ret != (IHEVCD_ERROR_T)IHEVCD_SUCCESS), ret);
340
341	0	if(ps_codec->i4_slice_error)
342	0	s_nal.i1_nal_unit_type = ps_codec->s_parse.ps_slice_hdr->i1_nal_unit_type;
343
344		/* Setting RASL Output flag */
345	0	switch(s_nal.i1_nal_unit_type)
346	0	{
347	0	case NAL_BLA_W_LP :
348	0	case NAL_BLA_W_DLP :
349	0	case NAL_BLA_N_LP :
350	0	ps_codec->i4_rasl_output_flag = 0;
351	0	break;
352
353		//TODO: After IDR, there is no case of open GOP
354		//To be fixed appropriately by ignoring RASL only if the
355		// required references are not found
356	0	case NAL_IDR_W_LP :
357	0	case NAL_IDR_N_LP :
358	0	ps_codec->i4_rasl_output_flag = 1;
359	0	break;
360
361	0	case NAL_CRA :
362	0	ps_codec->i4_rasl_output_flag = (0 != ps_codec->i4_cra_as_first_pic) ? 0 : 1;
363	0	break;
364
365	0	default:
366	0	break;
367	0	}
368
369	0	switch(s_nal.i1_nal_unit_type)
370	0	{
371	0	case NAL_BLA_W_LP :
372	0	case NAL_BLA_W_DLP :
373	0	case NAL_BLA_N_LP :
374	0	case NAL_IDR_W_LP :
375	0	case NAL_IDR_N_LP :
376	0	case NAL_CRA :
377	0	case NAL_TRAIL_N :
378	0	case NAL_TRAIL_R :
379	0	case NAL_TSA_N :
380	0	case NAL_TSA_R :
381	0	case NAL_STSA_N :
382	0	case NAL_STSA_R :
383	0	case NAL_RADL_N :
384	0	case NAL_RADL_R :
385	0	case NAL_RASL_N :
386	0	case NAL_RASL_R :
387	0	if(ps_codec->i4_header_mode)
388	0	return IHEVCD_SLICE_IN_HEADER_MODE;
389
390	0	if((0 == ps_codec->i4_sps_done) \|\|
391	0	(0 == ps_codec->i4_pps_done))
392	0	{
393	0	return IHEVCD_INVALID_HEADER;
394	0	}
395
396	0	ps_codec->i4_header_in_slice_mode = 0;
397	0	ps_codec->i4_cra_as_first_pic = 0;
398
399	0	ret = ihevcd_parse_slice_header(ps_codec, &s_nal);
400	0	DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type);
401	0	if(ret == (IHEVCD_ERROR_T)IHEVCD_SUCCESS)
402	0	{
403	0	if((s_nal.i1_nal_unit_type != NAL_RASL_N && s_nal.i1_nal_unit_type != NAL_RASL_R) \|\|
404	0	ps_codec->i4_rasl_output_flag \|\|
405	0	ps_codec->i4_slice_error)
406	0	ret = ihevcd_parse_slice_data(ps_codec);
407	0	}
408	0	break;
409
410	0	case NAL_VPS :
411		// ret = ihevcd_parse_vps(ps_codec);
412	0	DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type);
413	0	break;
414
415	0	case NAL_SPS :
416	0	if(0 == ps_codec->i4_header_mode)
417	0	{
418	0	ps_codec->i4_header_in_slice_mode = 1;
419	0	if(ps_codec->i4_sps_done &&
420	0	ps_codec->i4_pic_present)
421	0	break;
422	0	}
423
424	0	ret = ihevcd_parse_sps(ps_codec);
425	0	if(ret == (IHEVCD_ERROR_T)IHEVCD_SUCCESS)
426	0	{
427	0	sps_t *ps_sps = ps_codec->ps_sps_base + MAX_SPS_CNT - 1;
428	0	ihevcd_copy_sps(ps_codec, ps_sps->i1_sps_id, MAX_SPS_CNT - 1);
429	0	}
430	0	ps_codec->i4_error_code = ret;
431
432	0	DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type);
433	0	break;
434
435	0	case NAL_PPS :
436	0	if(0 == ps_codec->i4_header_mode)
437	0	{
438	0	ps_codec->i4_header_in_slice_mode = 1;
439	0	if(ps_codec->i4_pps_done &&
440	0	ps_codec->i4_pic_present)
441	0	break;
442	0	}
443
444	0	ret = ihevcd_parse_pps(ps_codec);
445	0	if(ret == (IHEVCD_ERROR_T)IHEVCD_SUCCESS)
446	0	{
447	0	pps_t *ps_pps = ps_codec->ps_pps_base + MAX_PPS_CNT - 1;
448	0	ihevcd_copy_pps(ps_codec, ps_pps->i1_pps_id, MAX_PPS_CNT - 1);
449	0	}
450	0	ps_codec->i4_error_code = ret;
451	0	DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type);
452	0	break;
453
454	0	#ifndef DISABLE_SEI
455	0	case NAL_PREFIX_SEI:
456	0	case NAL_SUFFIX_SEI:
457	0	if(IVD_DECODE_HEADER == ps_codec->i4_header_mode)
458	0	{
459	0	return IHEVCD_SLICE_IN_HEADER_MODE;
460	0	}
461
462	0	ret = ihevcd_parse_sei(ps_codec, &s_nal);
463	0	break;
464
465	0	#endif
466	0	case NAL_EOS :
467	0	ps_codec->i4_cra_as_first_pic = 1;
468	0	break;
469
470	0	default:
471	0	DEBUG_PRINT_NAL_INFO(ps_codec, s_nal.i1_nal_unit_type);
472	0	break;
473	0	}
474
475	0	return ret;
476	0	}
477