vp8_multi_resolution_encoder.c

/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

/*
 * This is an example demonstrating multi-resolution encoding in VP8.
 * High-resolution input video is down-sampled to lower-resolutions. The
 * encoder then encodes the video and outputs multiple bitstreams with
 * different resolutions.
 */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "math.h"
#define VPX_CODEC_DISABLE_COMPAT 1
#include "vpx/vpx_encoder.h"
#include "vpx/vp8cx.h"
#include "vpx_ports/mem_ops.h"
#define interface (vpx_codec_vp8_cx())
#define fourcc    0x30385056

#define IVF_FILE_HDR_SZ  (32)
#define IVF_FRAME_HDR_SZ (12)

/*
 * The input video frame is downsampled several times to generate a multi-level
 * hierarchical structure. NUM_ENCODERS is defined as the number of encoding
 * levels required. For example, if the size of input video is 1280x720,
 * NUM_ENCODERS is 3, and down-sampling factor is 2, the encoder outputs 3
 * bitstreams with resolution of 1280x720(level 0), 640x360(level 1), and
 * 320x180(level 2) respectively.
 */
#define NUM_ENCODERS 3

/* This example uses the scaler function in libyuv. */
#include "third_party/libyuv/include/libyuv/basic_types.h"
#include "third_party/libyuv/include/libyuv/scale.h"
#include "third_party/libyuv/include/libyuv/cpu_id.h"

static double vp8_mse2psnr(double Samples, double Peak, double Mse)
{
    double psnr;

    if ((double)Mse > 0.0)
        psnr = 10.0 * log10(Peak * Peak * Samples / Mse);
    else
        psnr = 60;      // Limit to prevent / 0

    if (psnr > 60)
        psnr = 60;

    return psnr;
}

static void die(const char *fmt, ...) {
    va_list ap;

    va_start(ap, fmt);
    vprintf(fmt, ap);
    if(fmt[strlen(fmt)-1] != '\n')
        printf("\n");
    exit(EXIT_FAILURE);
}