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diff --git a/media/libvpx/libvpx/examples/twopass_encoder.c b/media/libvpx/libvpx/examples/twopass_encoder.c
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+/*
+ * 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. To increase the quality while sacrificing encoding speed,
+// VPX_DL_BEST_QUALITY can be used in place of VPX_DL_GOOD_QUALITY.
+//
+// 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>
+
+#include "vpx/vpx_encoder.h"
+
+#include "../tools_common.h"
+#include "../video_writer.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+ fprintf(stderr,
+ "Usage: %s <codec> <width> <height> <infile> <outfile> "
+ "<frame limit>\n",
+ exec_name);
+ exit(EXIT_FAILURE);
+}
+
+static int 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) {
+ int got_pkts = 0;
+ 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) {
+ got_pkts = 1;
+
+ 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);
+ if (!stats->buf) die("Failed to reallocate stats buffer.");
+ memcpy((uint8_t *)stats->buf + stats->sz, pkt_buf, pkt_size);
+ stats->sz += pkt_size;
+ }
+ }
+
+ return got_pkts;
+}
+
+static int 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) {
+ int got_pkts = 0;
+ 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) {
+ got_pkts = 1;
+ 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);
+ }
+ }
+
+ return got_pkts;
+}
+
+static vpx_fixed_buf_t pass0(vpx_image_t *raw, FILE *infile,
+ const VpxInterface *encoder,
+ const vpx_codec_enc_cfg_t *cfg, int max_frames) {
+ vpx_codec_ctx_t codec;
+ int frame_count = 0;
+ vpx_fixed_buf_t stats = { NULL, 0 };
+
+ if (vpx_codec_enc_init(&codec, encoder->codec_interface(), cfg, 0))
+ die("Failed to initialize encoder");
+
+ // Calculate frame statistics.
+ while (vpx_img_read(raw, infile)) {
+ ++frame_count;
+ get_frame_stats(&codec, raw, frame_count, 1, 0, VPX_DL_GOOD_QUALITY,
+ &stats);
+ if (max_frames > 0 && frame_count >= max_frames) break;
+ }
+
+ // Flush encoder.
+ while (get_frame_stats(&codec, NULL, frame_count, 1, 0, VPX_DL_GOOD_QUALITY,
+ &stats)) {
+ }
+
+ printf("Pass 0 complete. Processed %d frames.\n", frame_count);
+ if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+ return stats;
+}
+
+static void pass1(vpx_image_t *raw, FILE *infile, const char *outfile_name,
+ const VpxInterface *encoder, const vpx_codec_enc_cfg_t *cfg,
+ int max_frames) {
+ VpxVideoInfo info = { encoder->fourcc,
+ cfg->g_w,
+ cfg->g_h,
+ { cfg->g_timebase.num, cfg->g_timebase.den } };
+ VpxVideoWriter *writer = NULL;
+ vpx_codec_ctx_t codec;
+ int frame_count = 0;
+
+ writer = vpx_video_writer_open(outfile_name, kContainerIVF, &info);
+ if (!writer) die("Failed to open %s for writing", outfile_name);
+
+ if (vpx_codec_enc_init(&codec, encoder->codec_interface(), cfg, 0))
+ die("Failed to initialize encoder");
+
+ // Encode frames.
+ while (vpx_img_read(raw, infile)) {
+ ++frame_count;
+ encode_frame(&codec, raw, frame_count, 1, 0, VPX_DL_GOOD_QUALITY, writer);
+
+ if (max_frames > 0 && frame_count >= max_frames) break;
+ }
+
+ // Flush encoder.
+ while (encode_frame(&codec, NULL, -1, 1, 0, VPX_DL_GOOD_QUALITY, writer)) {
+ }
+
+ printf("\n");
+
+ if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+ vpx_video_writer_close(writer);
+
+ printf("Pass 1 complete. Processed %d frames.\n", frame_count);
+}
+
+int main(int argc, char **argv) {
+ FILE *infile = NULL;
+ int w, h;
+ 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;
+
+ const VpxInterface *encoder = NULL;
+ 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];
+ int max_frames = 0;
+ exec_name = argv[0];
+
+ if (argc != 7) die("Invalid number of arguments.");
+
+ max_frames = (int)strtol(argv[6], NULL, 0);
+
+ encoder = get_vpx_encoder_by_name(codec_arg);
+ if (!encoder) die("Unsupported codec.");
+
+ w = (int)strtol(width_arg, NULL, 0);
+ h = (int)strtol(height_arg, NULL, 0);
+
+ if (w <= 0 || h <= 0 || (w % 2) != 0 || (h % 2) != 0)
+ die("Invalid frame size: %dx%d", w, h);
+
+ if (!vpx_img_alloc(&raw, VPX_IMG_FMT_I420, w, h, 1))
+ die("Failed to allocate image (%dx%d)", w, h);
+
+ printf("Using %s\n", vpx_codec_iface_name(encoder->codec_interface()));
+
+ // Configuration
+ 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 = w;
+ cfg.g_h = h;
+ cfg.g_timebase.num = 1;
+ cfg.g_timebase.den = fps;
+ cfg.rc_target_bitrate = bitrate;
+
+ if (!(infile = fopen(infile_arg, "rb")))
+ die("Failed to open %s for reading", infile_arg);
+
+ // Pass 0
+ cfg.g_pass = VPX_RC_FIRST_PASS;
+ stats = pass0(&raw, infile, encoder, &cfg, max_frames);
+
+ // Pass 1
+ rewind(infile);
+ cfg.g_pass = VPX_RC_LAST_PASS;
+ cfg.rc_twopass_stats_in = stats;
+ pass1(&raw, infile, outfile_arg, encoder, &cfg, max_frames);
+ free(stats.buf);
+
+ vpx_img_free(&raw);
+ fclose(infile);
+
+ return EXIT_SUCCESS;
+}
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