ref: c2c03f2b58cc4c821cd0ac38e5eb6de705fff415
dir: /examples/twopass_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.
*/
// Two Pass Encoder
// ================
//
// This is an example of a two pass encoder loop. It takes an input file in
// YV12 format, passes it through the encoder twice, and writes the compressed
// frames to disk in IVF format. It builds upon the simple_encoder example.
//
// Twopass Variables
// -----------------
// Twopass mode needs to track the current pass number and the buffer of
// statistics packets.
//
// Updating The Configuration
// ---------------------------------
// In two pass mode, the configuration has to be updated on each pass. The
// statistics buffer is passed on the last pass.
//
// Encoding A Frame
// ----------------
// Encoding a frame in two pass mode is identical to the simple encoder
// example, except the deadline is set to VPX_DL_BEST_QUALITY to get the
// best quality possible. VPX_DL_GOOD_QUALITY could also be used.
//
//
// Processing Statistics Packets
// -----------------------------
// Each packet of type `VPX_CODEC_CX_FRAME_PKT` contains the encoded data
// for this frame. We write a IVF frame header, followed by the raw data.
//
//
// Pass Progress Reporting
// -----------------------------
// It's sometimes helpful to see when each pass completes.
//
//
// Clean-up
// -----------------------------
// Destruction of the encoder instance must be done on each pass. The
// raw image should be destroyed at the end as usual.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define VPX_CODEC_DISABLE_COMPAT 1
#include "vpx/vpx_encoder.h"
#include "./tools_common.h"
#include "./video_writer.h"
static const char *exec_name;
void usage_exit() {
fprintf(stderr, "Usage: %s <codec> <width> <height> <infile> <outfile>\n",
exec_name);
exit(EXIT_FAILURE);
}
static void get_frame_stats(vpx_codec_ctx_t *ctx,
const vpx_image_t *img,
vpx_codec_pts_t pts,
unsigned int duration,
vpx_enc_frame_flags_t flags,
unsigned int deadline,
vpx_fixed_buf_t *stats) {
vpx_codec_iter_t iter = NULL;
const vpx_codec_cx_pkt_t *pkt = NULL;
const vpx_codec_err_t res = vpx_codec_encode(ctx, img, pts, duration, flags,
deadline);
if (res != VPX_CODEC_OK)
die_codec(ctx, "Failed to get frame stats.");
while ((pkt = vpx_codec_get_cx_data(ctx, &iter)) != NULL) {
if (pkt->kind == VPX_CODEC_STATS_PKT) {
const uint8_t *const pkt_buf = pkt->data.twopass_stats.buf;
const size_t pkt_size = pkt->data.twopass_stats.sz;
stats->buf = realloc(stats->buf, stats->sz + pkt_size);
memcpy((uint8_t *)stats->buf + stats->sz, pkt_buf, pkt_size);
stats->sz += pkt_size;
}
}
}
static void encode_frame(vpx_codec_ctx_t *ctx,
const vpx_image_t *img,
vpx_codec_pts_t pts,
unsigned int duration,
vpx_enc_frame_flags_t flags,
unsigned int deadline,
VpxVideoWriter *writer) {
vpx_codec_iter_t iter = NULL;
const vpx_codec_cx_pkt_t *pkt = NULL;
const vpx_codec_err_t res = vpx_codec_encode(ctx, img, pts, duration, flags,
deadline);
if (res != VPX_CODEC_OK)
die_codec(ctx, "Failed to encode frame.");
while ((pkt = vpx_codec_get_cx_data(ctx, &iter)) != NULL) {
if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
const int keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;
if (!vpx_video_writer_write_frame(writer, pkt->data.frame.buf,
pkt->data.frame.sz,
pkt->data.frame.pts))
die_codec(ctx, "Failed to write compressed frame.");
printf(keyframe ? "K" : ".");
fflush(stdout);
}
}
}
int main(int argc, char **argv) {
FILE *infile = NULL;
VpxVideoWriter *writer = NULL;
vpx_codec_ctx_t codec;
vpx_codec_enc_cfg_t cfg;
vpx_image_t raw;
vpx_codec_err_t res;
vpx_fixed_buf_t stats = {0};
VpxVideoInfo info = {0};
const VpxInterface *encoder = NULL;
int pass;
const int fps = 30; // TODO(dkovalev) add command line argument
const int bitrate = 200; // kbit/s TODO(dkovalev) add command line argument
const char *const codec_arg = argv[1];
const char *const width_arg = argv[2];
const char *const height_arg = argv[3];
const char *const infile_arg = argv[4];
const char *const outfile_arg = argv[5];
exec_name = argv[0];
if (argc != 6)
die("Invalid number of arguments.");
encoder = get_vpx_encoder_by_name(codec_arg);
if (!encoder)
die("Unsupported codec.");
info.codec_fourcc = encoder->fourcc;
info.time_base.numerator = 1;
info.time_base.denominator = fps;
info.frame_width = strtol(width_arg, NULL, 0);
info.frame_height = strtol(height_arg, NULL, 0);
if (info.frame_width <= 0 ||
info.frame_height <= 0 ||
(info.frame_width % 2) != 0 ||
(info.frame_height % 2) != 0) {
die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
}
if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, info.frame_width,
info.frame_height, 1)) {
die("Failed to allocate image", info.frame_width, info.frame_height);
}
writer = vpx_video_writer_open(outfile_arg, kContainerIVF, &info);
if (!writer)
die("Failed to open %s for writing", outfile_arg);
printf("Using %s\n", vpx_codec_iface_name(encoder->codec_interface()));
res = vpx_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
if (res)
die_codec(&codec, "Failed to get default codec config.");
cfg.g_w = info.frame_width;
cfg.g_h = info.frame_height;
cfg.g_timebase.num = info.time_base.numerator;
cfg.g_timebase.den = info.time_base.denominator;
cfg.rc_target_bitrate = bitrate;
for (pass = 0; pass < 2; ++pass) {
int frame_count = 0;
if (pass == 0) {
cfg.g_pass = VPX_RC_FIRST_PASS;
} else {
cfg.g_pass = VPX_RC_LAST_PASS;
cfg.rc_twopass_stats_in = stats;
}
if (!(infile = fopen(infile_arg, "rb")))
die("Failed to open %s for reading", infile_arg);
if (vpx_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))
die_codec(&codec, "Failed to initialize encoder");
while (vpx_img_read(&raw, infile)) {
++frame_count;
if (pass == 0) {
get_frame_stats(&codec, &raw, frame_count, 1, 0, VPX_DL_BEST_QUALITY,
&stats);
} else {
encode_frame(&codec, &raw, frame_count, 1, 0, VPX_DL_BEST_QUALITY,
writer);
}
}
if (pass == 0) {
get_frame_stats(&codec, NULL, frame_count, 1, 0, VPX_DL_BEST_QUALITY,
&stats);
} else {
printf("\n");
}
fclose(infile);
printf("Pass %d complete. Processed %d frames.\n", pass + 1, frame_count);
if (vpx_codec_destroy(&codec))
die_codec(&codec, "Failed to destroy codec.");
}
vpx_img_free(&raw);
free(stats.buf);
vpx_video_writer_close(writer);
return EXIT_SUCCESS;
}