1 /*
2 * Copyright (c) 2013 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 "./warnings.h"
12
13 #include <assert.h>
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <string.h>
17
18 #include "vpx/vpx_encoder.h"
19
20 #include "./tools_common.h"
21 #include "./vpxenc.h"
22
23 static const char quantizer_warning_string[] =
24 "Bad quantizer values. Quantizer values should not be equal, and should "
25 "differ by at least 8.";
26 static const char lag_in_frames_with_realtime[] =
27 "Lag in frames is ignored when deadline is set to realtime for cbr mode.";
28
29 struct WarningListNode {
30 const char *warning_string;
31 struct WarningListNode *next_warning;
32 };
33
34 struct WarningList {
35 struct WarningListNode *warning_node;
36 };
37
add_warning(const char * warning_string,struct WarningList * warning_list)38 static void add_warning(const char *warning_string,
39 struct WarningList *warning_list) {
40 struct WarningListNode **node = &warning_list->warning_node;
41
42 struct WarningListNode *new_node = malloc(sizeof(*new_node));
43 if (new_node == NULL) {
44 fatal("Unable to allocate warning node.");
45 }
46
47 new_node->warning_string = warning_string;
48 new_node->next_warning = NULL;
49
50 while (*node != NULL) node = &(*node)->next_warning;
51
52 *node = new_node;
53 }
54
free_warning_list(struct WarningList * warning_list)55 static void free_warning_list(struct WarningList *warning_list) {
56 while (warning_list->warning_node != NULL) {
57 struct WarningListNode *const node = warning_list->warning_node;
58 warning_list->warning_node = node->next_warning;
59 free(node);
60 }
61 }
62
continue_prompt(int num_warnings)63 static int continue_prompt(int num_warnings) {
64 int c;
65 fprintf(stderr,
66 "%d encoder configuration warning(s). Continue? (y to continue) ",
67 num_warnings);
68 c = getchar();
69 return c == 'y';
70 }
71
check_quantizer(int min_q,int max_q,struct WarningList * warning_list)72 static void check_quantizer(int min_q, int max_q,
73 struct WarningList *warning_list) {
74 const int lossless = min_q == 0 && max_q == 0;
75 if (!lossless && (min_q == max_q || abs(max_q - min_q) < 8))
76 add_warning(quantizer_warning_string, warning_list);
77 }
78
check_lag_in_frames_realtime_deadline(int lag_in_frames,int deadline,int rc_end_usage,struct WarningList * warning_list)79 static void check_lag_in_frames_realtime_deadline(
80 int lag_in_frames, int deadline, int rc_end_usage,
81 struct WarningList *warning_list) {
82 if (deadline == VPX_DL_REALTIME && lag_in_frames != 0 && rc_end_usage == 1)
83 add_warning(lag_in_frames_with_realtime, warning_list);
84 }
85
check_encoder_config(int disable_prompt,const struct VpxEncoderConfig * global_config,const struct vpx_codec_enc_cfg * stream_config)86 void check_encoder_config(int disable_prompt,
87 const struct VpxEncoderConfig *global_config,
88 const struct vpx_codec_enc_cfg *stream_config) {
89 int num_warnings = 0;
90 struct WarningListNode *warning = NULL;
91 struct WarningList warning_list = { 0 };
92
93 check_quantizer(stream_config->rc_min_quantizer,
94 stream_config->rc_max_quantizer, &warning_list);
95 check_lag_in_frames_realtime_deadline(
96 stream_config->g_lag_in_frames, global_config->deadline,
97 stream_config->rc_end_usage, &warning_list);
98 /* Count and print warnings. */
99 for (warning = warning_list.warning_node; warning != NULL;
100 warning = warning->next_warning, ++num_warnings) {
101 warn("%s", warning->warning_string);
102 }
103
104 free_warning_list(&warning_list);
105
106 if (num_warnings) {
107 if (!disable_prompt && !continue_prompt(num_warnings)) exit(EXIT_FAILURE);
108 }
109 }
110