Move libvpx from DEPS to src

third_party/libvpx/source/libvpx/examples/twopass_encoder.c

Index: third_party/libvpx/source/libvpx/examples/twopass_encoder.c
diff --git a/third_party/libvpx/source/libvpx/examples/twopass_encoder.c b/third_party/libvpx/source/libvpx/examples/twopass_encoder.c
new file mode 100644
index 0000000000000000000000000000000000000000..0ec83ddccdfd11a08d146d882bf129610ec7094f
--- /dev/null
+++ b/third_party/libvpx/source/libvpx/examples/twopass_encoder.c
@@ -0,0 +1,265 @@
+/*
+ *  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() {
+  fprintf(stderr, "Usage: %s <codec> <width> <height> <infile> <outfile>\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);
+      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) {
+  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_codec(&codec, "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);
+  }
+
+  // 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) {
+  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_codec(&codec, "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);
+  }
+
+  // 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];
+  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.");
+
+  w = strtol(width_arg, NULL, 0);
+  h = 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", 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);
+
+  // Pass 1
+  rewind(infile);
+  cfg.g_pass = VPX_RC_LAST_PASS;
+  cfg.rc_twopass_stats_in = stats;
+  pass1(&raw, infile, outfile_arg, encoder, &cfg);
+  free(stats.buf);
+
+  vpx_img_free(&raw);
+  fclose(infile);
+
+  return EXIT_SUCCESS;
+}