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      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.";
     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 
     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)
     51     node = &(*node)->next_warning;
     52 
     53   *node = new_node;
     54 }
     55 
     56 static void free_warning_list(struct WarningList *warning_list) {
     57   while (warning_list->warning_node != NULL) {
     58     struct WarningListNode *const node = warning_list->warning_node;
     59     warning_list->warning_node = node->next_warning;
     60     free(node);
     61   }
     62 }
     63 
     64 static int continue_prompt(int num_warnings) {
     65   int c;
     66   fprintf(stderr,
     67           "%d encoder configuration warning(s). Continue? (y to continue) ",
     68           num_warnings);
     69   c = getchar();
     70   return c == 'y';
     71 }
     72 
     73 static void check_quantizer(int min_q, int max_q,
     74                             struct WarningList *warning_list) {
     75   const int lossless = min_q == 0 && max_q == 0;
     76   if (!lossless && (min_q == max_q || abs(max_q - min_q) < 8))
     77     add_warning(quantizer_warning_string, warning_list);
     78 }
     79 
     80 static void check_lag_in_frames_realtime_deadline(
     81     int lag_in_frames,
     82     int deadline,
     83     struct WarningList *warning_list) {
     84   if (deadline == VPX_DL_REALTIME && lag_in_frames != 0)
     85     add_warning(lag_in_frames_with_realtime, warning_list);
     86 }
     87 
     88 void check_encoder_config(int disable_prompt,
     89                           const struct VpxEncoderConfig *global_config,
     90                           const struct vpx_codec_enc_cfg *stream_config) {
     91   int num_warnings = 0;
     92   struct WarningListNode *warning = NULL;
     93   struct WarningList warning_list = {0};
     94 
     95   check_quantizer(stream_config->rc_min_quantizer,
     96                   stream_config->rc_max_quantizer,
     97                   &warning_list);
     98   check_lag_in_frames_realtime_deadline(stream_config->g_lag_in_frames,
     99                                         global_config->deadline,
    100                                         &warning_list);
    101   /* Count and print warnings. */
    102   for (warning = warning_list.warning_node;
    103        warning != NULL;
    104        warning = warning->next_warning,
    105        ++num_warnings) {
    106     warn(warning->warning_string);
    107   }
    108 
    109   free_warning_list(&warning_list);
    110 
    111   if (num_warnings) {
    112     if (!disable_prompt && !continue_prompt(num_warnings))
    113       exit(EXIT_FAILURE);
    114   }
    115 }
    116