Bug Summary

File:root/firefox-clang/media/libvpx/libvpx/vp9/encoder/vp9_mbgraph.c
Warning:line 242, column 3
Address of stack memory associated with local variable 'mi_above' is still referred to by the caller variable 'cpi' upon returning to the caller. This will be a dangling reference

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name vp9_mbgraph.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -ffp-contract=off -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/root/firefox-clang/obj-x86_64-pc-linux-gnu/media/libvpx -fcoverage-compilation-dir=/root/firefox-clang/obj-x86_64-pc-linux-gnu/media/libvpx -resource-dir /usr/lib/llvm-21/lib/clang/21 -include /root/firefox-clang/obj-x86_64-pc-linux-gnu/mozilla-config.h -U _FORTIFY_SOURCE -D _FORTIFY_SOURCE=2 -D _GLIBCXX_ASSERTIONS -D DEBUG=1 -D HAVE_CONFIG_H=vpx_config.h -D MOZ_HAS_MOZGLUE -I /root/firefox-clang/media/libvpx -I /root/firefox-clang/obj-x86_64-pc-linux-gnu/media/libvpx -I /root/firefox-clang/media/libvpx/config/linux/x64 -I /root/firefox-clang/media/libvpx/config -I /root/firefox-clang/media/libvpx/libvpx -I /root/firefox-clang/obj-x86_64-pc-linux-gnu/dist/include -I /root/firefox-clang/obj-x86_64-pc-linux-gnu/dist/include/nspr -I /root/firefox-clang/obj-x86_64-pc-linux-gnu/dist/include/nss -D MOZILLA_CLIENT -internal-isystem /usr/lib/llvm-21/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-error=tautological-type-limit-compare -Wno-range-loop-analysis -Wno-error=deprecated-declarations -Wno-error=array-bounds -Wno-error=free-nonheap-object -Wno-error=atomic-alignment -Wno-error=deprecated-builtins -Wno-psabi -Wno-error=builtin-macro-redefined -Wno-unknown-warning-option -Wno-sign-compare -Wno-unused-function -Wno-unreachable-code -Wno-unneeded-internal-declaration -ferror-limit 19 -fstrict-flex-arrays=1 -stack-protector 2 -fstack-clash-protection -ftrivial-auto-var-init=pattern -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2025-06-27-100320-3286336-1 -x c /root/firefox-clang/media/libvpx/libvpx/vp9/encoder/vp9_mbgraph.c
1/*
2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include <limits.h>
12
13#include "./vp9_rtcd.h"
14#include "./vpx_dsp_rtcd.h"
15
16#include "vpx_dsp/vpx_dsp_common.h"
17#include "vpx_mem/vpx_mem.h"
18#include "vpx_ports/system_state.h"
19#include "vp9/encoder/vp9_segmentation.h"
20#include "vp9/encoder/vp9_mcomp.h"
21#include "vp9/common/vp9_blockd.h"
22#include "vp9/common/vp9_reconinter.h"
23#include "vp9/common/vp9_reconintra.h"
24
25static unsigned int do_16x16_motion_iteration(VP9_COMP *cpi, const MV *ref_mv,
26 MV *dst_mv, int mb_row,
27 int mb_col) {
28 MACROBLOCK *const x = &cpi->td.mb;
29 MACROBLOCKD *const xd = &x->e_mbd;
30 MV_SPEED_FEATURES *const mv_sf = &cpi->sf.mv;
31 const SEARCH_METHODS old_search_method = mv_sf->search_method;
32 const vp9_variance_fn_ptr_t v_fn_ptr = cpi->fn_ptr[BLOCK_16X166];
33 const MvLimits tmp_mv_limits = x->mv_limits;
34 MV ref_full;
35 int cost_list[5];
36
37 // Further step/diamond searches as necessary
38 int step_param = mv_sf->reduce_first_step_size;
39 step_param = VPXMIN(step_param, MAX_MVSEARCH_STEPS - 2)(((step_param) < (11 - 2)) ? (step_param) : (11 - 2));
40
41 vp9_set_mv_search_range(&x->mv_limits, ref_mv);
42
43 ref_full.col = ref_mv->col >> 3;
44 ref_full.row = ref_mv->row >> 3;
45
46 mv_sf->search_method = HEX;
47 vp9_full_pixel_search(cpi, x, BLOCK_16X166, &ref_full, step_param,
48 cpi->sf.mv.search_method, x->errorperbit,
49 cond_cost_list(cpi, cost_list), ref_mv, dst_mv, 0, 0);
50 mv_sf->search_method = old_search_method;
51
52 /* restore UMV window */
53 x->mv_limits = tmp_mv_limits;
54
55 // Try sub-pixel MC
56 // if (bestsme > error_thresh && bestsme < INT_MAX)
57 {
58 uint32_t distortion;
59 uint32_t sse;
60 // TODO(yunqing): may use higher tap interp filter than 2 taps if needed.
61 cpi->find_fractional_mv_step(
62 x, dst_mv, ref_mv, cpi->common.allow_high_precision_mv, x->errorperbit,
63 &v_fn_ptr, 0, mv_sf->subpel_search_level,
64 cond_cost_list(cpi, cost_list), NULL((void*)0), NULL((void*)0), &distortion, &sse, NULL((void*)0), 0,
65 0, USE_2_TAPS);
66 }
67
68 xd->mi[0]->mode = NEWMV13;
69 xd->mi[0]->mv[0].as_mv = *dst_mv;
70
71 vp9_build_inter_predictors_sby(xd, mb_row, mb_col, BLOCK_16X166);
72
73 return vpx_sad16x16vpx_sad16x16_sse2(x->plane[0].src.buf, x->plane[0].src.stride,
74 xd->plane[0].dst.buf, xd->plane[0].dst.stride);
75}
76
77static int do_16x16_motion_search(VP9_COMP *cpi, const MV *ref_mv,
78 int_mv *dst_mv, int mb_row, int mb_col) {
79 MACROBLOCK *const x = &cpi->td.mb;
80 MACROBLOCKD *const xd = &x->e_mbd;
81 unsigned int err, tmp_err;
82 MV tmp_mv;
83
84 // Try zero MV first
85 // FIXME should really use something like near/nearest MV and/or MV prediction
86 err = vpx_sad16x16vpx_sad16x16_sse2(x->plane[0].src.buf, x->plane[0].src.stride,
87 xd->plane[0].pre[0].buf, xd->plane[0].pre[0].stride);
88 dst_mv->as_int = 0;
89
90 // Test last reference frame using the previous best mv as the
91 // starting point (best reference) for the search
92 tmp_err = do_16x16_motion_iteration(cpi, ref_mv, &tmp_mv, mb_row, mb_col);
93 if (tmp_err < err) {
94 err = tmp_err;
95 dst_mv->as_mv = tmp_mv;
96 }
97
98 // If the current best reference mv is not centered on 0,0 then do a 0,0
99 // based search as well.
100 if (ref_mv->row != 0 || ref_mv->col != 0) {
101 MV zero_ref_mv = { 0, 0 };
102
103 tmp_err =
104 do_16x16_motion_iteration(cpi, &zero_ref_mv, &tmp_mv, mb_row, mb_col);
105 if (tmp_err < err) {
106 dst_mv->as_mv = tmp_mv;
107 err = tmp_err;
108 }
109 }
110
111 return err;
112}
113
114static int do_16x16_zerozero_search(VP9_COMP *cpi, int_mv *dst_mv) {
115 MACROBLOCK *const x = &cpi->td.mb;
116 MACROBLOCKD *const xd = &x->e_mbd;
117 unsigned int err;
118
119 // Try zero MV first
120 // FIXME should really use something like near/nearest MV and/or MV prediction
121 err = vpx_sad16x16vpx_sad16x16_sse2(x->plane[0].src.buf, x->plane[0].src.stride,
122 xd->plane[0].pre[0].buf, xd->plane[0].pre[0].stride);
123
124 dst_mv->as_int = 0;
125
126 return err;
127}
128static int find_best_16x16_intra(VP9_COMP *cpi, PREDICTION_MODE *pbest_mode) {
129 MACROBLOCK *const x = &cpi->td.mb;
130 MACROBLOCKD *const xd = &x->e_mbd;
131 PREDICTION_MODE best_mode = -1, mode;
132 unsigned int best_err = INT_MAX2147483647;
133
134 // calculate SATD for each intra prediction mode;
135 // we're intentionally not doing 4x4, we just want a rough estimate
136 for (mode = DC_PRED0; mode <= TM_PRED9; mode++) {
137 unsigned int err;
138
139 xd->mi[0]->mode = mode;
140 vp9_predict_intra_block(xd, 2, TX_16X16((TX_SIZE)2), mode, x->plane[0].src.buf,
141 x->plane[0].src.stride, xd->plane[0].dst.buf,
142 xd->plane[0].dst.stride, 0, 0, 0);
143 err = vpx_sad16x16vpx_sad16x16_sse2(x->plane[0].src.buf, x->plane[0].src.stride,
144 xd->plane[0].dst.buf, xd->plane[0].dst.stride);
145
146 // find best
147 if (err < best_err) {
148 best_err = err;
149 best_mode = mode;
150 }
151 }
152
153 if (pbest_mode) *pbest_mode = best_mode;
154
155 return best_err;
156}
157
158static void update_mbgraph_mb_stats(VP9_COMP *cpi, MBGRAPH_MB_STATS *stats,
159 YV12_BUFFER_CONFIG *buf, int mb_y_offset,
160 YV12_BUFFER_CONFIG *golden_ref,
161 const MV *prev_golden_ref_mv,
162 YV12_BUFFER_CONFIG *alt_ref, int mb_row,
163 int mb_col) {
164 MACROBLOCK *const x = &cpi->td.mb;
165 MACROBLOCKD *const xd = &x->e_mbd;
166 int intra_error;
167 VP9_COMMON *cm = &cpi->common;
168
169 // FIXME in practice we're completely ignoring chroma here
170 x->plane[0].src.buf = buf->y_buffer + mb_y_offset;
171 x->plane[0].src.stride = buf->y_stride;
172
173 xd->plane[0].dst.buf = get_frame_new_buffer(cm)->y_buffer + mb_y_offset;
174 xd->plane[0].dst.stride = get_frame_new_buffer(cm)->y_stride;
175
176 // do intra 16x16 prediction
177 intra_error = find_best_16x16_intra(cpi, &stats->ref[INTRA_FRAME0].m.mode);
178 if (intra_error <= 0) intra_error = 1;
179 stats->ref[INTRA_FRAME0].err = intra_error;
180
181 // Golden frame MV search, if it exists and is different than last frame
182 if (golden_ref) {
183 int g_motion_error;
184 xd->plane[0].pre[0].buf = golden_ref->y_buffer + mb_y_offset;
185 xd->plane[0].pre[0].stride = golden_ref->y_stride;
186 g_motion_error =
187 do_16x16_motion_search(cpi, prev_golden_ref_mv,
188 &stats->ref[GOLDEN_FRAME2].m.mv, mb_row, mb_col);
189 stats->ref[GOLDEN_FRAME2].err = g_motion_error;
190 } else {
191 stats->ref[GOLDEN_FRAME2].err = INT_MAX2147483647;
192 stats->ref[GOLDEN_FRAME2].m.mv.as_int = 0;
193 }
194
195 // Do an Alt-ref frame MV search, if it exists and is different than
196 // last/golden frame.
197 if (alt_ref) {
198 int a_motion_error;
199 xd->plane[0].pre[0].buf = alt_ref->y_buffer + mb_y_offset;
200 xd->plane[0].pre[0].stride = alt_ref->y_stride;
201 a_motion_error =
202 do_16x16_zerozero_search(cpi, &stats->ref[ALTREF_FRAME3].m.mv);
203
204 stats->ref[ALTREF_FRAME3].err = a_motion_error;
205 } else {
206 stats->ref[ALTREF_FRAME3].err = INT_MAX2147483647;
207 stats->ref[ALTREF_FRAME3].m.mv.as_int = 0;
208 }
209}
210
211static void update_mbgraph_frame_stats(VP9_COMP *cpi,
212 MBGRAPH_FRAME_STATS *stats,
213 YV12_BUFFER_CONFIG *buf,
214 YV12_BUFFER_CONFIG *golden_ref,
215 YV12_BUFFER_CONFIG *alt_ref) {
216 MACROBLOCK *const x = &cpi->td.mb;
217 MACROBLOCKD *const xd = &x->e_mbd;
218 VP9_COMMON *const cm = &cpi->common;
219
220 int mb_col, mb_row, offset = 0;
221 int mb_y_offset = 0;
222 MV gld_top_mv = { 0, 0 };
223 MODE_INFO mi_local;
224 MODE_INFO mi_above, mi_left;
225
226 vp9_zero(mi_local)memset(&(mi_local), 0, sizeof(mi_local));
227 // Set up limit values for motion vectors to prevent them extending outside
228 // the UMV borders.
229 x->mv_limits.row_min = -BORDER_MV_PIXELS_B16(16 + 4);
230 x->mv_limits.row_max = (cm->mb_rows - 1) * 8 + BORDER_MV_PIXELS_B16(16 + 4);
231 // Signal to vp9_predict_intra_block() that above is not available
232 xd->above_mi = NULL((void*)0);
233
234 xd->plane[0].dst.stride = buf->y_stride;
235 xd->plane[0].pre[0].stride = buf->y_stride;
236 xd->plane[1].dst.stride = buf->uv_stride;
237 xd->mi[0] = &mi_local;
238 mi_local.sb_type = BLOCK_16X166;
239 mi_local.ref_frame[0] = LAST_FRAME1;
240 mi_local.ref_frame[1] = NO_REF_FRAME(-1);
241
242 for (mb_row = 0; mb_row < cm->mb_rows; mb_row++) {
15
←
Assuming 'mb_row' is < field 'mb_rows'
→
16
←
Loop condition is true. Entering loop body
→
19
←
Assuming 'mb_row' is >= field 'mb_rows'
→
20
←
Loop condition is false. Execution jumps to the end of the function
→
21
←
Address of stack memory associated with local variable 'mi_above' is still referred to by the caller variable 'cpi' upon returning to the caller. This will be a dangling reference
243 MV gld_left_mv = gld_top_mv;
244 int mb_y_in_offset = mb_y_offset;
245
246 // Set up limit values for motion vectors to prevent them extending outside
247 // the UMV borders.
248 x->mv_limits.col_min = -BORDER_MV_PIXELS_B16(16 + 4);
249 x->mv_limits.col_max = (cm->mb_cols - 1) * 8 + BORDER_MV_PIXELS_B16(16 + 4);
250 // Signal to vp9_predict_intra_block() that left is not available
251 xd->left_mi = NULL((void*)0);
252
253 for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {
17
←
Assuming 'mb_col' is >= field 'mb_cols'
→
18
←
Loop condition is false. Execution continues on line 271
→
254 MBGRAPH_MB_STATS *mb_stats = &stats->mb_stats[offset + mb_col];
255
256 update_mbgraph_mb_stats(cpi, mb_stats, buf, mb_y_in_offset, golden_ref,
257 &gld_left_mv, alt_ref, mb_row, mb_col);
258 gld_left_mv = mb_stats->ref[GOLDEN_FRAME2].m.mv.as_mv;
259 if (mb_col == 0) {
260 gld_top_mv = gld_left_mv;
261 }
262 // Signal to vp9_predict_intra_block() that left is available
263 xd->left_mi = &mi_left;
264
265 mb_y_in_offset += 16;
266 x->mv_limits.col_min -= 16;
267 x->mv_limits.col_max -= 16;
268 }
269
270 // Signal to vp9_predict_intra_block() that above is available
271 xd->above_mi = &mi_above;
272
273 mb_y_offset += buf->y_stride * 16;
274 x->mv_limits.row_min -= 16;
275 x->mv_limits.row_max -= 16;
276 offset += cm->mb_cols;
277 }
278}
279
280// void separate_arf_mbs_byzz
281static void separate_arf_mbs(VP9_COMP *cpi) {
282 VP9_COMMON *const cm = &cpi->common;
283 int mb_col, mb_row, offset, i;
284 int mi_row, mi_col;
285 int ncnt[4] = { 0 };
286 int n_frames = cpi->mbgraph_n_frames;
287
288 int *arf_not_zz;
289
290 CHECK_MEM_ERROR(do { ((void) sizeof (((&cm->error)->setjmp) ? 1 : 0
), __extension__ ({ if ((&cm->error)->setjmp) ; else
__assert_fail ("(&cm->error)->setjmp", "/root/firefox-clang/media/libvpx/libvpx/vp9/encoder/vp9_mbgraph.c"
, 292, __extension__ __PRETTY_FUNCTION__); })); (arf_not_zz) =
(vpx_calloc(cm->mb_rows * cm->mb_cols * sizeof(*arf_not_zz
), 1)); if (!(arf_not_zz)) vpx_internal_error(&cm->error
, VPX_CODEC_MEM_ERROR, "Failed to allocate " "arf_not_zz"); }
while (0)
291 &cm->error, arf_not_zz,do { ((void) sizeof (((&cm->error)->setjmp) ? 1 : 0
), __extension__ ({ if ((&cm->error)->setjmp) ; else
__assert_fail ("(&cm->error)->setjmp", "/root/firefox-clang/media/libvpx/libvpx/vp9/encoder/vp9_mbgraph.c"
, 292, __extension__ __PRETTY_FUNCTION__); })); (arf_not_zz) =
(vpx_calloc(cm->mb_rows * cm->mb_cols * sizeof(*arf_not_zz
), 1)); if (!(arf_not_zz)) vpx_internal_error(&cm->error
, VPX_CODEC_MEM_ERROR, "Failed to allocate " "arf_not_zz"); }
while (0)
292 vpx_calloc(cm->mb_rows * cm->mb_cols * sizeof(*arf_not_zz), 1))do { ((void) sizeof (((&cm->error)->setjmp) ? 1 : 0
), __extension__ ({ if ((&cm->error)->setjmp) ; else
__assert_fail ("(&cm->error)->setjmp", "/root/firefox-clang/media/libvpx/libvpx/vp9/encoder/vp9_mbgraph.c"
, 292, __extension__ __PRETTY_FUNCTION__); })); (arf_not_zz) =
(vpx_calloc(cm->mb_rows * cm->mb_cols * sizeof(*arf_not_zz
), 1)); if (!(arf_not_zz)) vpx_internal_error(&cm->error
, VPX_CODEC_MEM_ERROR, "Failed to allocate " "arf_not_zz"); }
while (0);
293
294 // We are not interested in results beyond the alt ref itself.
295 if (n_frames > cpi->rc.frames_till_gf_update_due)
296 n_frames = cpi->rc.frames_till_gf_update_due;
297
298 // defer cost to reference frames
299 for (i = n_frames - 1; i >= 0; i--) {
300 MBGRAPH_FRAME_STATS *frame_stats = &cpi->mbgraph_stats[i];
301
302 for (offset = 0, mb_row = 0; mb_row < cm->mb_rows;
303 offset += cm->mb_cols, mb_row++) {
304 for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {
305 MBGRAPH_MB_STATS *mb_stats = &frame_stats->mb_stats[offset + mb_col];
306
307 int altref_err = mb_stats->ref[ALTREF_FRAME3].err;
308 int intra_err = mb_stats->ref[INTRA_FRAME0].err;
309 int golden_err = mb_stats->ref[GOLDEN_FRAME2].err;
310
311 // Test for altref vs intra and gf and that its mv was 0,0.
312 if (altref_err > 1000 || altref_err > intra_err ||
313 altref_err > golden_err) {
314 arf_not_zz[offset + mb_col]++;
315 }
316 }
317 }
318 }
319
320 // arf_not_zz is indexed by MB, but this loop is indexed by MI to avoid out
321 // of bound access in segmentation_map
322 for (mi_row = 0; mi_row < cm->mi_rows; mi_row++) {
323 for (mi_col = 0; mi_col < cm->mi_cols; mi_col++) {
324 // If any of the blocks in the sequence failed then the MB
325 // goes in segment 0
326 if (arf_not_zz[mi_row / 2 * cm->mb_cols + mi_col / 2]) {
327 ncnt[0]++;
328 cpi->segmentation_map[mi_row * cm->mi_cols + mi_col] = 0;
329 } else {
330 cpi->segmentation_map[mi_row * cm->mi_cols + mi_col] = 1;
331 ncnt[1]++;
332 }
333 }
334 }
335
336 // Note % of blocks that are marked as static
337 if (cm->MBs)
338 cpi->static_mb_pct = (ncnt[1] * 100) / (cm->mi_rows * cm->mi_cols);
339
340 // This error case should not be reachable as this function should
341 // never be called with the common data structure uninitialized.
342 else
343 cpi->static_mb_pct = 0;
344
345 vp9_enable_segmentation(&cm->seg);
346
347 // Free localy allocated storage
348 vpx_free(arf_not_zz);
349}
350
351void vp9_update_mbgraph_stats(VP9_COMP *cpi) {
352 VP9_COMMON *const cm = &cpi->common;
353 int i, n_frames = vp9_lookahead_depth(cpi->lookahead);
354 YV12_BUFFER_CONFIG *golden_ref = get_ref_frame_buffer(cpi, GOLDEN_FRAME2);
355
356 assert(golden_ref != NULL)((void) sizeof ((golden_ref != ((void*)0)) ? 1 : 0), __extension__
({ if (golden_ref != ((void*)0)) ; else __assert_fail ("golden_ref != NULL"
, "/root/firefox-clang/media/libvpx/libvpx/vp9/encoder/vp9_mbgraph.c"
, 356, __extension__ __PRETTY_FUNCTION__); }));
1
Assuming 'golden_ref' is not equal to null
→
2
←
Taking true branch
→
357
358 // we need to look ahead beyond where the ARF transitions into
359 // being a GF - so exit if we don't look ahead beyond that
360 if (n_frames <= cpi->rc.frames_till_gf_update_due) return;
3
←
Assuming 'n_frames' is > field 'frames_till_gf_update_due'
→
4
←
Taking false branch
→
361
362 if (n_frames > MAX_LAG_BUFFERS25) n_frames = MAX_LAG_BUFFERS25;
5
←
Assuming 'n_frames' is <= MAX_LAG_BUFFERS
→
6
←
Taking false branch
→
363
364 cpi->mbgraph_n_frames = n_frames;
365 for (i = 0; i < n_frames; i++) {
7
←
Assuming 'i' is < 'n_frames'
→
8
←
Loop condition is true. Entering loop body
→
9
←
Assuming 'i' is >= 'n_frames'
→
10
←
Loop condition is false. Execution continues on line 375
→
366 MBGRAPH_FRAME_STATS *frame_stats = &cpi->mbgraph_stats[i];
367 memset(frame_stats->mb_stats, 0,
368 cm->mb_rows * cm->mb_cols * sizeof(*cpi->mbgraph_stats[i].mb_stats));
369 }
370
371 // do motion search to find contribution of each reference to data
372 // later on in this GF group
373 // FIXME really, the GF/last MC search should be done forward, and
374 // the ARF MC search backwards, to get optimal results for MV caching
375 for (i = 0; i < n_frames; i++) {
11
←
Loop condition is true. Entering loop body
→
376 MBGRAPH_FRAME_STATS *frame_stats = &cpi->mbgraph_stats[i];
377 struct lookahead_entry *q_cur = vp9_lookahead_peek(cpi->lookahead, i);
378
379 assert(q_cur != NULL)((void) sizeof ((q_cur != ((void*)0)) ? 1 : 0), __extension__
({ if (q_cur != ((void*)0)) ; else __assert_fail ("q_cur != NULL"
, "/root/firefox-clang/media/libvpx/libvpx/vp9/encoder/vp9_mbgraph.c"
, 379, __extension__ __PRETTY_FUNCTION__); }));
12
←
Assuming 'q_cur' is not equal to null
→
13
←
Taking true branch
→
380
381 update_mbgraph_frame_stats(cpi, frame_stats, &q_cur->img, golden_ref,
14
←
Calling 'update_mbgraph_frame_stats'
→
382 cpi->Source);
383 }
384
385 vpx_clear_system_state();
386
387 separate_arf_mbs(cpi);
388}