common/warnings.c

   1 /*
   2  * Copyright (c) 2016, Alliance for Open Media. All rights reserved
   3  *
   4  * This source code is subject to the terms of the BSD 2 Clause License and
   5  * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
   6  * was not distributed with this source code in the LICENSE file, you can
   7  * obtain it at www.aomedia.org/license/software. If the Alliance for Open
   8  * Media Patent License 1.0 was not distributed with this source code in the
   9  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  10  */
  11
  12 #include "common/warnings.h"
  13
  14 #include <assert.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18
  19 #include "aom/aom_encoder.h"
  20 #include "apps/aomenc.h"
  21 #include "common/tools_common.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
  27 struct WarningListNode {
  28   const char *warning_string;
  29   struct WarningListNode *next_warning;
  30 };
  31
  32 struct WarningList {
  33   struct WarningListNode *warning_node;
  34 };
  35
  36 static void add_warning(const char *warning_string,
  37                         struct WarningList *warning_list) {
  38   struct WarningListNode **node = &warning_list->warning_node;
  39
  40   struct WarningListNode *new_node = malloc(sizeof(*new_node));
  41   if (new_node == NULL) {
  42     fatal("Unable to allocate warning node.");
  43   }
  44
  45   new_node->warning_string = warning_string;
  46   new_node->next_warning = NULL;
  47
  48   while (*node != NULL) node = &(*node)->next_warning;
  49
  50   *node = new_node;
  51 }
  52
  53 static void free_warning_list(struct WarningList *warning_list) {
  54   while (warning_list->warning_node != NULL) {
  55     struct WarningListNode *const node = warning_list->warning_node;
  56     warning_list->warning_node = node->next_warning;
  57     free(node);
  58   }
  59 }
  60
  61 static int continue_prompt(int num_warnings) {
  62   int c;
  63   fprintf(stderr,
  64           "%d encoder configuration warning(s). Continue? (y to continue) ",
  65           num_warnings);
  66   c = getchar();
  67   return c == 'y';
  68 }
  69
  70 static void check_quantizer(int min_q, int max_q,
  71                             struct WarningList *warning_list) {
  72   const int lossless = min_q == 0 && max_q == 0;
  73   if (!lossless && (min_q == max_q || abs(max_q - min_q) < 8))
  74     add_warning(quantizer_warning_string, warning_list);
  75 }
  76
  77 void check_encoder_config(int disable_prompt,
  78                           const struct AvxEncoderConfig *global_config,
  79                           const struct aom_codec_enc_cfg *stream_config) {
  80   int num_warnings = 0;
  81   struct WarningListNode *warning = NULL;
  82   struct WarningList warning_list = { 0 };
  83   (void)global_config;
  84   check_quantizer(stream_config->rc_min_quantizer,
  85                   stream_config->rc_max_quantizer, &warning_list);
  86   /* Count and print warnings. */
  87   for (warning = warning_list.warning_node; warning != NULL;
  88        warning = warning->next_warning, ++num_warnings) {
  89     aom_tools_warn("%s", warning->warning_string);
  90   }
  91
  92   free_warning_list(&warning_list);
  93
  94   if (num_warnings) {
  95     if (!disable_prompt && !continue_prompt(num_warnings)) exit(EXIT_FAILURE);
  96   }
  97 }