1 /******************************************************************************
2 *
3 * Copyright (C) 2015 The Android Open Source Project
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 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
19 */
20
21 #include "iv_datatypedef.h"
22 #include "iv.h"
23
24 #include "impeg2_buf_mgr.h"
25 #include "impeg2_disp_mgr.h"
26 #include "impeg2_defs.h"
27 #include "impeg2_platform_macros.h"
28 #include "impeg2_inter_pred.h"
29 #include "impeg2_idct.h"
30 #include "impeg2_globals.h"
31 #include "impeg2_mem_func.h"
32 #include "impeg2_format_conv.h"
33 #include "impeg2_macros.h"
34
35 #include "ivd.h"
36 #include "impeg2d.h"
37 #include "impeg2d_bitstream.h"
38 #include "impeg2d_structs.h"
39 #include "impeg2d_vld_tables.h"
40 #include "impeg2d_vld.h"
41 #include "impeg2d_pic_proc.h"
42 #include "impeg2d_debug.h"
43 #include "impeg2d_globals.h"
44 #include "impeg2d_mv_dec.h"
45
46 /*******************************************************************************
47 * Function Name : impeg2d_dec_i_mb_params
48 *
49 * Description : Decoding I MB parameters.
50 *
51 * Arguments :
52 * dec : Decoder state
53 * stream : Bitstream
54 *
55 * Values Returned : None
56 *******************************************************************************/
impeg2d_dec_i_mb_params(dec_state_t * ps_dec)57 void impeg2d_dec_i_mb_params(dec_state_t *ps_dec)
58 {
59
60 UWORD16 u2_next_bits;
61 UWORD16 u2_bits_to_flush;
62 stream_t *ps_stream = &ps_dec->s_bit_stream;
63
64 /*-----------------------------------------------------------------------*/
65 /* Flush the MBAddrIncr Bit */
66 /* */
67 /* Since we are not supporting scalable modes there won't be skipped */
68 /* macroblocks in I-Picture and the MBAddrIncr will always be 1, */
69 /* The MBAddrIncr can never be greater than 1 for the simple and main */
70 /* profile MPEG2. */
71 /*-----------------------------------------------------------------------*/
72 if(impeg2d_bit_stream_nxt(ps_stream,1) == 1) //Making sure the increment is one.
73 {
74 impeg2d_bit_stream_flush(ps_stream,1);
75 }
76 else if(ps_dec->u2_first_mb && ps_dec->u2_mb_x)
77 {
78 WORD32 i4_mb_add_inc = impeg2d_get_mb_addr_incr(ps_stream);
79
80 //VOLParams->FirstInSlice = 0;
81 /****************************************************************/
82 /* Section 6.3.17 */
83 /* The first MB of a slice cannot be skipped */
84 /* But the mb_addr_incr can be > 1, because at the beginning of */
85 /* a slice, it indicates the offset from the last MB in the */
86 /* previous row. Hence for the first slice in a row, the */
87 /* mb_addr_incr needs to be 1. */
88 /****************************************************************/
89 /* MB_x is set to zero whenever MB_y changes. */
90
91 ps_dec->u2_mb_x = i4_mb_add_inc - 1;
92 ps_dec->u2_mb_x = MIN(ps_dec->u2_mb_x, (ps_dec->u2_num_horiz_mb - 1));
93 }
94
95 /*-----------------------------------------------------------------------*/
96 /* Decode the macroblock_type, dct_type and quantiser_scale_code */
97 /* */
98 /* macroblock_type 2 bits [can be either 1 or 01] */
99 /* dct_type 1 bit */
100 /* quantiser_scale_code 5 bits */
101 /*-----------------------------------------------------------------------*/
102 u2_next_bits = impeg2d_bit_stream_nxt(ps_stream,8);
103 if(BIT(u2_next_bits,7) == 1)
104 {
105 /* read the dct_type if needed */
106 u2_bits_to_flush = 1;
107 if(ps_dec->u2_read_dct_type)
108 {
109 u2_bits_to_flush++;
110 ps_dec->u2_field_dct = BIT(u2_next_bits,6);
111 }
112 }
113 else
114 {
115 u2_bits_to_flush = 7;
116 /*------------------------------------------------------------------*/
117 /* read the dct_type if needed */
118 /*------------------------------------------------------------------*/
119 if(ps_dec->u2_read_dct_type)
120 {
121 u2_bits_to_flush++;
122 ps_dec->u2_field_dct = BIT(u2_next_bits,5);
123 }
124 else
125 {
126 u2_next_bits >>= 1;
127 }
128 /*------------------------------------------------------------------*/
129 /* Quant scale code decoding */
130 /*------------------------------------------------------------------*/
131 {
132 UWORD16 quant_scale_code;
133 quant_scale_code = u2_next_bits & 0x1F;
134
135 ps_dec->u1_quant_scale = (ps_dec->u2_q_scale_type) ?
136 gau1_impeg2_non_linear_quant_scale[quant_scale_code] :
137 (quant_scale_code << 1);
138 }
139 }
140 impeg2d_bit_stream_flush(ps_stream,u2_bits_to_flush);
141 /*************************************************************************/
142 /* Decoding of motion vectors if concealment motion vectors are present */
143 /*************************************************************************/
144 if(ps_dec->u2_concealment_motion_vectors)
145 {
146 if(ps_dec->u2_picture_structure != FRAME_PICTURE)
147 impeg2d_bit_stream_flush(ps_stream,1);
148 impeg2d_dec_mv(ps_stream,ps_dec->ai2_pred_mv[FORW][FIRST],ps_dec->ai2_mv[FORW][FIRST],
149 ps_dec->au2_f_code[FORW],0,0);
150
151 /* Flush the marker bit */
152 if(0 == (impeg2d_bit_stream_get(ps_stream,1)))
153 {
154 /* Ignore marker bit error */
155 }
156
157 }
158 ps_dec->u2_first_mb = 0;
159 return;
160 }
161 /*******************************************************************************
162 * Function Name : impeg2d_dec_i_slice
163 *
164 * Description : Decodes I slice
165 *
166 * Arguments :
167 * dec : Decoder state
168 *
169 * Values Returned : None
170 *******************************************************************************/
impeg2d_dec_i_slice(dec_state_t * ps_dec)171 IMPEG2D_ERROR_CODES_T impeg2d_dec_i_slice(dec_state_t *ps_dec)
172 {
173 WORD16 *pi2_vld_out;
174 UWORD32 i;
175 yuv_buf_t *ps_cur_frm_buf = &ps_dec->s_cur_frm_buf;
176
177 UWORD32 u4_frame_width = ps_dec->u2_frame_width;
178 UWORD32 u4_frm_offset = 0;
179 UWORD8 *pu1_out_p;
180 IMPEG2D_ERROR_CODES_T e_error = (IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE;
181
182
183 pi2_vld_out = ps_dec->ai2_vld_buf;
184
185
186 if(ps_dec->u2_picture_structure != FRAME_PICTURE)
187 {
188 u4_frame_width <<= 1;
189 if(ps_dec->u2_picture_structure == BOTTOM_FIELD)
190 {
191 u4_frm_offset = ps_dec->u2_frame_width;
192 }
193 }
194
195 do
196 {
197 UWORD32 u4_x_offset,u4_y_offset;
198 UWORD32 u4_blk_pos;
199 UWORD32 u4_x_dst_offset = 0;
200 UWORD32 u4_y_dst_offset = 0;
201
202
203 IMPEG2D_TRACE_MB_START(ps_dec->u2_mb_x, ps_dec->u2_mb_y);
204
205 impeg2d_dec_i_mb_params(ps_dec);
206
207 u4_x_dst_offset = u4_frm_offset + (ps_dec->u2_mb_x << 4);
208 u4_y_dst_offset = (ps_dec->u2_mb_y << 4) * u4_frame_width;
209 pu1_out_p = ps_cur_frm_buf->pu1_y + u4_x_dst_offset + u4_y_dst_offset;
210
211 for(i = 0; i < NUM_LUMA_BLKS; ++i)
212 {
213
214 e_error = ps_dec->pf_vld_inv_quant(ps_dec, pi2_vld_out,
215 ps_dec->pu1_inv_scan_matrix, 1, Y_LUMA, 0);
216 if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)
217 {
218 return e_error;
219 }
220
221 u4_x_offset = gai2_impeg2_blk_x_off[i];
222
223 if(ps_dec->u2_field_dct == 0)
224 u4_y_offset = gai2_impeg2_blk_y_off_frm[i] ;
225 else
226 u4_y_offset = gai2_impeg2_blk_y_off_fld[i] ;
227
228 u4_blk_pos = u4_y_offset * u4_frame_width + u4_x_offset;
229 IMPEG2D_IDCT_INP_STATISTICS(pi2_vld_out, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);
230
231 PROFILE_DISABLE_IDCT_IF0
232 {
233 WORD32 i4_idx;
234 i4_idx = 1;
235 if(1 == (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))
236 i4_idx = 0;
237
238 ps_dec->pf_idct_recon[i4_idx * 2 + ps_dec->i4_last_value_one](pi2_vld_out,
239 ps_dec->ai2_idct_stg1,
240 (UWORD8 *)gau1_impeg2_zerobuf,
241 pu1_out_p + u4_blk_pos,
242 8,
243 8,
244 u4_frame_width << ps_dec->u2_field_dct,
245 ~ps_dec->u4_non_zero_cols, ~ps_dec->u4_non_zero_rows);
246
247 }
248
249 }
250
251 /* For U and V blocks, divide the x and y offsets by 2. */
252 u4_x_dst_offset >>= 1;
253 u4_y_dst_offset >>= 2;
254
255 /* In case of chrominance blocks the DCT will be frame DCT */
256 /* i = 0, U component and */
257
258 e_error = ps_dec->pf_vld_inv_quant(ps_dec, pi2_vld_out,
259 ps_dec->pu1_inv_scan_matrix, 1, U_CHROMA, 0);
260 if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)
261 {
262 return e_error;
263 }
264
265 pu1_out_p = ps_cur_frm_buf->pu1_u + u4_x_dst_offset + u4_y_dst_offset;
266 IMPEG2D_IDCT_INP_STATISTICS(pi2_vld_out, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);
267 PROFILE_DISABLE_IDCT_IF0
268 {
269 WORD32 i4_idx;
270 i4_idx = 1;
271 if(1 == (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))
272 i4_idx = 0;
273
274 ps_dec->pf_idct_recon[i4_idx * 2 + ps_dec->i4_last_value_one](pi2_vld_out,
275 ps_dec->ai2_idct_stg1,
276 (UWORD8 *)gau1_impeg2_zerobuf,
277 pu1_out_p,
278 8,
279 8,
280 u4_frame_width >> 1,
281 ~ps_dec->u4_non_zero_cols, ~ps_dec->u4_non_zero_rows);
282
283 }
284 /* Write the idct_out block to the current frame dec->curFrame*/
285 /* In case of field DCT type, write to alternate lines */
286 e_error = ps_dec->pf_vld_inv_quant(ps_dec, pi2_vld_out,
287 ps_dec->pu1_inv_scan_matrix, 1, V_CHROMA, 0);
288 if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)
289 {
290 return e_error;
291 }
292
293 pu1_out_p = ps_cur_frm_buf->pu1_v + u4_x_dst_offset + u4_y_dst_offset;
294 IMPEG2D_IDCT_INP_STATISTICS(pi2_vld_out, ps_dec->u4_non_zero_cols, ps_dec->u4_non_zero_rows);
295 PROFILE_DISABLE_IDCT_IF0
296 {
297 WORD32 i4_idx;
298 i4_idx = 1;
299 if(1 == (ps_dec->u4_non_zero_cols | ps_dec->u4_non_zero_rows))
300 i4_idx = 0;
301 ps_dec->pf_idct_recon[i4_idx * 2 + ps_dec->i4_last_value_one](pi2_vld_out,
302 ps_dec->ai2_idct_stg1,
303 (UWORD8 *)gau1_impeg2_zerobuf,
304 pu1_out_p,
305 8,
306 8,
307 u4_frame_width >> 1,
308 ~ps_dec->u4_non_zero_cols, ~ps_dec->u4_non_zero_rows);
309 }
310 ps_dec->u2_num_mbs_left--;
311
312
313 ps_dec->u2_mb_x++;
314
315 if(ps_dec->s_bit_stream.u4_offset > ps_dec->s_bit_stream.u4_max_offset)
316 {
317 return IMPEG2D_BITSTREAM_BUFF_EXCEEDED_ERR;
318 }
319 else if (ps_dec->u2_mb_x == ps_dec->u2_num_horiz_mb)
320 {
321 ps_dec->u2_mb_x = 0;
322 ps_dec->u2_mb_y++;
323 }
324
325 }
326 while(ps_dec->u2_num_mbs_left != 0 && impeg2d_bit_stream_nxt(&ps_dec->s_bit_stream,23) != 0x0);
327 return e_error;
328 }
329