257 строки
9.1 KiB
C
257 строки
9.1 KiB
C
/*
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* Copyright (c) 2010 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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// Simple Encoder
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// ==============
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//
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// This is an example of a simple encoder loop. It takes an input file in
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// YV12 format, passes it through the encoder, and writes the compressed
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// frames to disk in IVF format. Other decoder examples build upon this
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// one.
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//
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// The details of the IVF format have been elided from this example for
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// simplicity of presentation, as IVF files will not generally be used by
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// your application. In general, an IVF file consists of a file header,
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// followed by a variable number of frames. Each frame consists of a frame
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// header followed by a variable length payload. The length of the payload
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// is specified in the first four bytes of the frame header. The payload is
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// the raw compressed data.
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//
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// Standard Includes
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// -----------------
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// For encoders, you only have to include `vpx_encoder.h` and then any
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// header files for the specific codecs you use. In this case, we're using
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// vp8.
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//
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// Getting The Default Configuration
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// ---------------------------------
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// Encoders have the notion of "usage profiles." For example, an encoder
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// may want to publish default configurations for both a video
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// conferencing application and a best quality offline encoder. These
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// obviously have very different default settings. Consult the
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// documentation for your codec to see if it provides any default
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// configurations. All codecs provide a default configuration, number 0,
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// which is valid for material in the vacinity of QCIF/QVGA.
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//
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// Updating The Configuration
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// ---------------------------------
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// Almost all applications will want to update the default configuration
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// with settings specific to their usage. Here we set the width and height
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// of the video file to that specified on the command line. We also scale
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// the default bitrate based on the ratio between the default resolution
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// and the resolution specified on the command line.
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//
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// Initializing The Codec
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// ----------------------
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// The encoder is initialized by the following code.
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//
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// Encoding A Frame
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// ----------------
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// The frame is read as a continuous block (size width * height * 3 / 2)
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// from the input file. If a frame was read (the input file has not hit
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// EOF) then the frame is passed to the encoder. Otherwise, a NULL
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// is passed, indicating the End-Of-Stream condition to the encoder. The
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// `frame_cnt` is reused as the presentation time stamp (PTS) and each
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// frame is shown for one frame-time in duration. The flags parameter is
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// unused in this example. The deadline is set to VPX_DL_REALTIME to
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// make the example run as quickly as possible.
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// Forced Keyframes
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// ----------------
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// Keyframes can be forced by setting the VPX_EFLAG_FORCE_KF bit of the
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// flags passed to `vpx_codec_control()`. In this example, we force a
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// keyframe every <keyframe-interval> frames. Note, the output stream can
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// contain additional keyframes beyond those that have been forced using the
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// VPX_EFLAG_FORCE_KF flag because of automatic keyframe placement by the
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// encoder.
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//
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// Processing The Encoded Data
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// ---------------------------
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// Each packet of type `VPX_CODEC_CX_FRAME_PKT` contains the encoded data
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// for this frame. We write a IVF frame header, followed by the raw data.
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//
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// Cleanup
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// -------
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// The `vpx_codec_destroy` call frees any memory allocated by the codec.
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//
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// Error Handling
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// --------------
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// This example does not special case any error return codes. If there was
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// an error, a descriptive message is printed and the program exits. With
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// few exeptions, vpx_codec functions return an enumerated error status,
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// with the value `0` indicating success.
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//
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// Error Resiliency Features
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// -------------------------
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// Error resiliency is controlled by the g_error_resilient member of the
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// configuration structure. Use the `decode_with_drops` example to decode with
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// frames 5-10 dropped. Compare the output for a file encoded with this example
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// versus one encoded with the `simple_encoder` example.
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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 "./video_writer.h"
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static const char *exec_name;
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void usage_exit() {
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fprintf(stderr,
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"Usage: %s <codec> <width> <height> <infile> <outfile> "
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"<keyframe-interval> [<error-resilient>]\nSee comments in "
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"simple_encoder.c for more information.\n",
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exec_name);
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exit(EXIT_FAILURE);
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}
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static int encode_frame(vpx_codec_ctx_t *codec,
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vpx_image_t *img,
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int frame_index,
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int flags,
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VpxVideoWriter *writer) {
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int got_pkts = 0;
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vpx_codec_iter_t iter = NULL;
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const vpx_codec_cx_pkt_t *pkt = NULL;
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const vpx_codec_err_t res = vpx_codec_encode(codec, img, frame_index, 1,
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flags, VPX_DL_GOOD_QUALITY);
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if (res != VPX_CODEC_OK)
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die_codec(codec, "Failed to encode frame");
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while ((pkt = vpx_codec_get_cx_data(codec, &iter)) != NULL) {
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got_pkts = 1;
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if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
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const int keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;
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if (!vpx_video_writer_write_frame(writer,
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pkt->data.frame.buf,
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pkt->data.frame.sz,
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pkt->data.frame.pts)) {
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die_codec(codec, "Failed to write compressed frame");
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}
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printf(keyframe ? "K" : ".");
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fflush(stdout);
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}
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}
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return got_pkts;
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}
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int main(int argc, char **argv) {
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FILE *infile = NULL;
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vpx_codec_ctx_t codec;
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vpx_codec_enc_cfg_t cfg;
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int frame_count = 0;
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vpx_image_t raw;
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vpx_codec_err_t res;
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VpxVideoInfo info = {0};
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VpxVideoWriter *writer = NULL;
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const VpxInterface *encoder = NULL;
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const int fps = 30; // TODO(dkovalev) add command line argument
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const int bitrate = 200; // kbit/s TODO(dkovalev) add command line argument
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int keyframe_interval = 0;
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// TODO(dkovalev): Add some simple command line parsing code to make the
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// command line more flexible.
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const char *codec_arg = NULL;
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const char *width_arg = NULL;
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const char *height_arg = NULL;
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const char *infile_arg = NULL;
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const char *outfile_arg = NULL;
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const char *keyframe_interval_arg = NULL;
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exec_name = argv[0];
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if (argc < 7)
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die("Invalid number of arguments");
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codec_arg = argv[1];
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width_arg = argv[2];
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height_arg = argv[3];
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infile_arg = argv[4];
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outfile_arg = argv[5];
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keyframe_interval_arg = argv[6];
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encoder = get_vpx_encoder_by_name(codec_arg);
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if (!encoder)
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die("Unsupported codec.");
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info.codec_fourcc = encoder->fourcc;
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info.frame_width = strtol(width_arg, NULL, 0);
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info.frame_height = strtol(height_arg, NULL, 0);
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info.time_base.numerator = 1;
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info.time_base.denominator = fps;
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if (info.frame_width <= 0 ||
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info.frame_height <= 0 ||
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(info.frame_width % 2) != 0 ||
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(info.frame_height % 2) != 0) {
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die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
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}
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if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, info.frame_width,
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info.frame_height, 1)) {
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die("Failed to allocate image.");
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}
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keyframe_interval = strtol(keyframe_interval_arg, NULL, 0);
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if (keyframe_interval < 0)
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die("Invalid keyframe interval value.");
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printf("Using %s\n", vpx_codec_iface_name(encoder->codec_interface()));
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res = vpx_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
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if (res)
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die_codec(&codec, "Failed to get default codec config.");
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cfg.g_w = info.frame_width;
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cfg.g_h = info.frame_height;
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cfg.g_timebase.num = info.time_base.numerator;
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cfg.g_timebase.den = info.time_base.denominator;
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cfg.rc_target_bitrate = bitrate;
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cfg.g_error_resilient = argc > 7 ? strtol(argv[7], NULL, 0) : 0;
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writer = vpx_video_writer_open(outfile_arg, kContainerIVF, &info);
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if (!writer)
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die("Failed to open %s for writing.", outfile_arg);
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if (!(infile = fopen(infile_arg, "rb")))
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die("Failed to open %s for reading.", infile_arg);
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if (vpx_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))
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die_codec(&codec, "Failed to initialize encoder");
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// Encode frames.
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while (vpx_img_read(&raw, infile)) {
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int flags = 0;
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if (keyframe_interval > 0 && frame_count % keyframe_interval == 0)
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flags |= VPX_EFLAG_FORCE_KF;
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encode_frame(&codec, &raw, frame_count++, flags, writer);
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}
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// Flush encoder.
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while (encode_frame(&codec, NULL, -1, 0, writer)) {};
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printf("\n");
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fclose(infile);
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printf("Processed %d frames.\n", frame_count);
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vpx_img_free(&raw);
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if (vpx_codec_destroy(&codec))
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die_codec(&codec, "Failed to destroy codec.");
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vpx_video_writer_close(writer);
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return EXIT_SUCCESS;
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}
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