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 "./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
  21 #include "./tools_common.h"
  22 #include "./aomenc.h"
  23
  24 static const char quantizer_warning_string[] =
  25     "Bad quantizer values. Quantizer values should not be equal, and should "
  26     "differ by at least 8.";
  27
  28 struct WarningListNode {
  29   const char *warning_string;
  30   struct WarningListNode *next_warning;
  31 };
  32
  33 struct WarningList {
  34   struct WarningListNode *warning_node;
  35 };
  36
  37 static void add_warning(const char *warning_string,
  38                         struct WarningList *warning_list) {
  39   struct WarningListNode **node = &warning_list->warning_node;
  40
  41   struct WarningListNode *new_node = malloc(sizeof(*new_node));
  42   if (new_node == NULL) {
  43     fatal("Unable to allocate warning node.");
  44   }
  45
  46   new_node->warning_string = warning_string;
  47   new_node->next_warning = NULL;
  48
  49   while (*node != NULL) node = &(*node)->next_warning;
  50
  51   *node = new_node;
  52 }
  53
  54 static void free_warning_list(struct WarningList *warning_list) {
  55   while (warning_list->warning_node != NULL) {
  56     struct WarningListNode *const node = warning_list->warning_node;
  57     warning_list->warning_node = node->next_warning;
  58     free(node);
  59   }
  60 }
  61
  62 static int continue_prompt(int num_warnings) {
  63   int c;
  64   fprintf(stderr,
  65           "%d encoder configuration warning(s). Continue? (y to continue) ",
  66           num_warnings);
  67   c = getchar();
  68   return c == 'y';
  69 }
  70
  71 static void check_quantizer(int min_q, int max_q,
  72                             struct WarningList *warning_list) {
  73   const int lossless = min_q == 0 && max_q == 0;
  74   if (!lossless && (min_q == max_q || abs(max_q - min_q) < 8))
  75     add_warning(quantizer_warning_string, warning_list);
  76 }
  77
  78 void check_encoder_config(int disable_prompt,
  79                           const struct AvxEncoderConfig *global_config,
  80                           const struct aom_codec_enc_cfg *stream_config) {
  81   int num_warnings = 0;
  82   struct WarningListNode *warning = NULL;
  83   struct WarningList warning_list = { 0 };
  84   (void)global_config;
  85   check_quantizer(stream_config->rc_min_quantizer,
  86                   stream_config->rc_max_quantizer, &warning_list);
  87   /* Count and print warnings. */
  88   for (warning = warning_list.warning_node; warning != NULL;
  89        warning = warning->next_warning, ++num_warnings) {
  90     warn(warning->warning_string);
  91   }
  92
  93   free_warning_list(&warning_list);
  94
  95   if (num_warnings) {
  96     if (!disable_prompt && !continue_prompt(num_warnings)) exit(EXIT_FAILURE);
  97   }
  98 }