ff073a70ee
Allow the encoder to use fixed quantization step size. Note that this effectively breaks the internal rate control scheme and can cause substantial compression performance. Change-Id: I1caacb1ab06629107f8975e5f707de16d6d5b36a
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/*
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* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "./warnings.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "vpx/vpx_encoder.h"
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#include "./tools_common.h"
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#include "./vpxenc.h"
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static const char quantizer_warning_string[] =
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"Bad quantizer values. Quantizer values should not be equal, and should "
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"differ by at least 8.";
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static const char lag_in_frames_with_realtime[] =
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"Lag in frames is ignored when deadline is set to realtime.";
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struct WarningListNode {
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const char *warning_string;
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struct WarningListNode *next_warning;
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};
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struct WarningList {
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struct WarningListNode *warning_node;
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};
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static void add_warning(const char *warning_string,
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struct WarningList *warning_list) {
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struct WarningListNode **node = &warning_list->warning_node;
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struct WarningListNode *new_node = malloc(sizeof(*new_node));
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if (new_node == NULL) {
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fatal("Unable to allocate warning node.");
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}
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new_node->warning_string = warning_string;
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new_node->next_warning = NULL;
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while (*node != NULL)
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node = &(*node)->next_warning;
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*node = new_node;
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}
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static void free_warning_list(struct WarningList *warning_list) {
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while (warning_list->warning_node != NULL) {
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struct WarningListNode *const node = warning_list->warning_node;
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warning_list->warning_node = node->next_warning;
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free(node);
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}
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}
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static int continue_prompt(int num_warnings) {
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int c;
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fprintf(stderr,
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"%d encoder configuration warning(s). Continue? (y to continue) ",
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num_warnings);
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c = getchar();
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return c == 'y';
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}
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static void check_quantizer(int min_q, int max_q,
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struct WarningList *warning_list) {
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const int lossless = min_q == 0 && max_q == 0;
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if (!lossless && (min_q == max_q || abs(max_q - min_q) < 8))
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add_warning(quantizer_warning_string, warning_list);
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}
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static void check_lag_in_frames_realtime_deadline(
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int lag_in_frames,
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int deadline,
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struct WarningList *warning_list) {
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if (deadline == VPX_DL_REALTIME && lag_in_frames != 0)
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add_warning(lag_in_frames_with_realtime, warning_list);
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}
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void check_encoder_config(int disable_prompt,
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const struct VpxEncoderConfig *global_config,
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const struct vpx_codec_enc_cfg *stream_config) {
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int num_warnings = 0;
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struct WarningListNode *warning = NULL;
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struct WarningList warning_list = {0};
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#if !CONFIG_TRANSCODE
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check_quantizer(stream_config->rc_min_quantizer,
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stream_config->rc_max_quantizer,
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&warning_list);
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#endif
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check_lag_in_frames_realtime_deadline(stream_config->g_lag_in_frames,
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global_config->deadline,
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&warning_list);
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/* Count and print warnings. */
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for (warning = warning_list.warning_node;
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warning != NULL;
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warning = warning->next_warning,
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++num_warnings) {
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warn(warning->warning_string);
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}
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free_warning_list(&warning_list);
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if (num_warnings) {
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if (!disable_prompt && !continue_prompt(num_warnings))
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exit(EXIT_FAILURE);
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}
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}
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