text: /*
   *  Copyright (c) 2012 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 how to implement a multi-layer VP8
   * encoding scheme based on temporal scalability for video applications
   * that benefit from a scalable bitstream.
   */
  #include <stdio.h>
  #include <stdlib.h>
  #include <stdarg.h>
  #include <string.h>
  #define VPX_CODEC_DISABLE_COMPAT 1
  #include "vpx/vpx_encoder.h"
  #include "vpx/vp8cx.h"
  #define interface (vpx_codec_vp8_cx())
  #define fourcc    0x30385056
  
  #define IVF_FILE_HDR_SZ  (32)
  #define IVF_FRAME_HDR_SZ (12)
  
  static void mem_put_le16(char *mem, unsigned int val) {
      mem[0] = val;
      mem[1] = val>>8;
  }
  
  static void mem_put_le32(char *mem, unsigned int val) {
      mem[0] = val;
      mem[1] = val>>8;
      mem[2] = val>>16;
      mem[3] = val>>24;
  }
  
  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);
  }
  
  static void die_codec(vpx_codec_ctx_t *ctx, const char *s) {
      const char *detail = vpx_codec_error_detail(ctx);
  
      printf("%s: %s\n", s, vpx_codec_error(ctx));
      if(detail)
          printf("    %s\n",detail);
      exit(EXIT_FAILURE);
  }
  
  static int read_frame(FILE *f, vpx_image_t *img) {
      size_t nbytes, to_read;
      int    res = 1;
  
      to_read = img->w*img->h*3/2;
      nbytes = fread(img->planes[0], 1, to_read, f);
      if(nbytes != to_read) {
          res = 0;
          if(nbytes > 0)
              printf("Warning: Read partial frame. Check your width & height!\n");
      }
      return res;
  }
  
  static void write_ivf_file_header(FILE *outfile,
                                    const vpx_codec_enc_cfg_t *cfg,
                                    int frame_cnt) {
      char header[32];
  
      if(cfg->g_pass != VPX_RC_ONE_PASS && cfg->g_pass != VPX_RC_LAST_PASS)
          return;
      header[0] = 'D';
      header[1] = 'K';
      header[2] = 'I';
      header[3] = 'F';
      mem_put_le16(header+4,  0);                   /* version */
      mem_put_le16(header+6,  32);                  /* headersize */
      mem_put_le32(header+8,  fourcc);              /* headersize */
      mem_put_le16(header+12, cfg->g_w);            /* width */
      mem_put_le16(header+14, cfg->g_h);            /* height */
      mem_put_le32(header+16, cfg->g_timebase.den); /* rate */
      mem_put_le32(header+20, cfg->g_timebase.num); /* scale */
      mem_put_le32(header+24, frame_cnt);           /* length */
      mem_put_le32(header+28, 0);                   /* unused */
  
      (void) fwrite(header, 1, 32, outfile);
  }
  
  
  static void write_ivf_frame_header(FILE *outfile,
                                     const vpx_codec_cx_pkt_t *pkt)
  {
      char             header[12];
      vpx_codec_pts_t  pts;
  
      if(pkt->kind != VPX_CODEC_CX_FRAME_PKT)
          return;
  
      pts = pkt->data.frame.pts;
      mem_put_le32(header, pkt->data.frame.sz);
      mem_put_le32(header+4, pts&0xFFFFFFFF);
      mem_put_le32(header+8, pts >> 32);
  
      (void) fwrite(header, 1, 12, outfile);
  }
  
  static int mode_to_num_layers[12] = {1, 2, 2, 3, 3, 3, 3, 5, 2, 3, 3, 3};
  
  int main(int argc, char **argv) {
      FILE                *infile, *outfile[VPX_TS_MAX_LAYERS];
      vpx_codec_ctx_t      codec;
      vpx_codec_enc_cfg_t  cfg;
      int                  frame_cnt = 0;
      vpx_image_t          raw;
      vpx_codec_err_t      res;
      unsigned int         width;
      unsigned int         height;
      int                  frame_avail;
      int                  got_data;
      int                  flags = 0;
      int                  i;
      int                  pts = 0;              /* PTS starts at 0 */
      int                  frame_duration = 1;   /* 1 timebase tick per frame */
  
      int                  layering_mode = 0;
      int                  frames_in_layer[VPX_TS_MAX_LAYERS] = {0};
      int                  layer_flags[VPX_TS_MAX_PERIODICITY] = {0};
      int                  flag_periodicity;
      int                  max_intra_size_pct;
  
      /* Check usage and arguments */
      if (argc < 9)
          die("Usage: %s <infile> <outfile> <width> <height> <rate_num> "
              " <rate_den> <mode> <Rate_0> ... <Rate_nlayers-1>\n", argv[0]);
  
      width  = strtol (argv[3], NULL, 0);
      height = strtol (argv[4], NULL, 0);
      if (width < 16 || width%2 || height <16 || height%2)
          die ("Invalid resolution: %d x %d", width, height);
  
      if (!sscanf(argv[7], "%d", &layering_mode))
          die ("Invalid mode %s", argv[7]);
      if (layering_mode<0 || layering_mode>11)
          die ("Invalid mode (0..11) %s", argv[7]);
  
      if (argc != 8+mode_to_num_layers[layering_mode])
          die ("Invalid number of arguments");
  
      if (!vpx_img_alloc (&raw, VPX_IMG_FMT_I420, width, height, 32))
          die ("Failed to allocate image", width, height);
  
      printf("Using %s\n",vpx_codec_iface_name(interface));
  
      /* Populate encoder configuration */
      res = vpx_codec_enc_config_default(interface, &cfg, 0);
      if(res) {
          printf("Failed to get config: %s\n", vpx_codec_err_to_string(res));
          return EXIT_FAILURE;
      }
  
      /* Update the default configuration with our settings */
      cfg.g_w = width;
      cfg.g_h = height;
  
      /* Timebase format e.g. 30fps: numerator=1, demoninator=30 */
      if (!sscanf (argv[5], "%d", &cfg.g_timebase.num ))
          die ("Invalid timebase numerator %s", argv[5]);
      if (!sscanf (argv[6], "%d", &cfg.g_timebase.den ))
          die ("Invalid timebase denominator %s", argv[6]);
  
      for (i=8; i<8+mode_to_num_layers[layering_mode]; i++)
          if (!sscanf(argv[i], "%ud", &cfg.ts_target_bitrate[i-8]))
              die ("Invalid data rate %s", argv[i]);
  
      /* Real time parameters */
      cfg.rc_dropframe_thresh = 0;
      cfg.rc_end_usage        = VPX_CBR;
      cfg.rc_resize_allowed   = 0;
      cfg.rc_min_quantizer    = 2;
      cfg.rc_max_quantizer    = 56;
      cfg.rc_undershoot_pct   = 100;
      cfg.rc_overshoot_pct    = 15;
      cfg.rc_buf_initial_sz   = 500;
      cfg.rc_buf_optimal_sz   = 600;
      cfg.rc_buf_sz           = 1000;
  
      /* Enable error resilient mode */
      cfg.g_error_resilient = 1;
      cfg.g_lag_in_frames   = 0;
      cfg.kf_mode           = VPX_KF_DISABLED;
  
      /* Disable automatic keyframe placement */
      cfg.kf_min_dist = cfg.kf_max_dist = 3000;
  
      /* Default setting for bitrate: used in special case of 1 layer (case 0). */
      cfg.rc_target_bitrate = cfg.ts_target_bitrate[0];
  
      /* Temporal scaling parameters: */
      /* NOTE: The 3 prediction frames cannot be used interchangeably due to
       * differences in the way they are handled throughout the code. The
       * frames should be allocated to layers in the order LAST, GF, ARF.
       * Other combinations work, but may produce slightly inferior results.
       */
      switch (layering_mode)
      {
      case 0:
      {
          /* 1-layer */
         int ids[1] = {0};
         cfg.ts_number_layers     = 1;
         cfg.ts_periodicity       = 1;
         cfg.ts_rate_decimator[0] = 1;
         memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
         flag_periodicity = cfg.ts_periodicity;
  
         // Update L only.
         layer_flags[0] = VPX_EFLAG_FORCE_KF  |
                          VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
         break;
      }
      case 1:
      {
          /* 2-layers, 2-frame period */
          int ids[2] = {0,1};
          cfg.ts_number_layers     = 2;
          cfg.ts_periodicity       = 2;
          cfg.ts_rate_decimator[0] = 2;
          cfg.ts_rate_decimator[1] = 1;
          memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
          flag_periodicity = cfg.ts_periodicity;
  #if 1
          /* 0=L, 1=GF, Intra-layer prediction enabled */
          layer_flags[0] = VPX_EFLAG_FORCE_KF  |
                           VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
                           VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF;
          layer_flags[1] = VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST |
                           VP8_EFLAG_NO_REF_ARF;
  #else
          /* 0=L, 1=GF, Intra-layer prediction disabled */
          layer_flags[0] = VPX_EFLAG_FORCE_KF  |
                           VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
                           VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF;
          layer_flags[1] = VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST |
                           VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_REF_LAST;
  #endif
          break;
      }
  
      case 2:
      {
          /* 2-layers, 3-frame period */
          int ids[3] = {0,1,1};
          cfg.ts_number_layers     = 2;
          cfg.ts_periodicity       = 3;
          cfg.ts_rate_decimator[0] = 3;
          cfg.ts_rate_decimator[1] = 1;
          memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
          flag_periodicity = cfg.ts_periodicity;
  
          /* 0=L, 1=GF, Intra-layer prediction enabled */
          layer_flags[0] = VPX_EFLAG_FORCE_KF  |
                           VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[1] =
          layer_flags[2] = VP8_EFLAG_NO_REF_GF  |
                           VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_UPD_ARF |
                                                  VP8_EFLAG_NO_UPD_LAST;
          break;
      }
  
      case 3:
      {
          /* 3-layers, 6-frame period */
          int ids[6] = {0,2,2,1,2,2};
          cfg.ts_number_layers     = 3;
          cfg.ts_periodicity       = 6;
          cfg.ts_rate_decimator[0] = 6;
          cfg.ts_rate_decimator[1] = 3;
          cfg.ts_rate_decimator[2] = 1;
          memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
          flag_periodicity = cfg.ts_periodicity;
  
          /* 0=L, 1=GF, 2=ARF, Intra-layer prediction enabled */
          layer_flags[0] = VPX_EFLAG_FORCE_KF  |
                           VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[3] = VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_UPD_ARF |
                                                  VP8_EFLAG_NO_UPD_LAST;
          layer_flags[1] =
          layer_flags[2] =
          layer_flags[4] =
          layer_flags[5] = VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_LAST;
          break;
      }
  
      case 4:
      {
          /* 3-layers, 4-frame period */
          int ids[4] = {0,2,1,2};
          cfg.ts_number_layers     = 3;
          cfg.ts_periodicity       = 4;
          cfg.ts_rate_decimator[0] = 4;
          cfg.ts_rate_decimator[1] = 2;
          cfg.ts_rate_decimator[2] = 1;
          memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
          flag_periodicity = cfg.ts_periodicity;
  
          /* 0=L, 1=GF, 2=ARF, Intra-layer prediction disabled */
          layer_flags[0] = VPX_EFLAG_FORCE_KF  |
                           VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[2] = VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_ARF |
                           VP8_EFLAG_NO_UPD_LAST;
          layer_flags[1] =
          layer_flags[3] = VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF |
                           VP8_EFLAG_NO_UPD_ARF;
          break;
      }
  
      case 5:
      {
          /* 3-layers, 4-frame period */
          int ids[4] = {0,2,1,2};
          cfg.ts_number_layers     = 3;
          cfg.ts_periodicity       = 4;
          cfg.ts_rate_decimator[0] = 4;
          cfg.ts_rate_decimator[1] = 2;
          cfg.ts_rate_decimator[2] = 1;
          memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
          flag_periodicity = cfg.ts_periodicity;
  
          /* 0=L, 1=GF, 2=ARF, Intra-layer prediction enabled in layer 1,
           * disabled in layer 2
           */
          layer_flags[0] = VPX_EFLAG_FORCE_KF  |
                           VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[2] = VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[1] =
          layer_flags[3] = VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF |
                           VP8_EFLAG_NO_UPD_ARF;
          break;
      }
  
      case 6:
      {
          /* 3-layers, 4-frame period */
          int ids[4] = {0,2,1,2};
          cfg.ts_number_layers     = 3;
          cfg.ts_periodicity       = 4;
          cfg.ts_rate_decimator[0] = 4;
          cfg.ts_rate_decimator[1] = 2;
          cfg.ts_rate_decimator[2] = 1;
          memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
          flag_periodicity = cfg.ts_periodicity;
  
          /* 0=L, 1=GF, 2=ARF, Intra-layer prediction enabled */
          layer_flags[0] = VPX_EFLAG_FORCE_KF  |
                           VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[2] = VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[1] =
          layer_flags[3] = VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF;
          break;
      }
  
      case 7:
      {
          /* NOTE: Probably of academic interest only */
  
          /* 5-layers, 16-frame period */
          int ids[16] = {0,4,3,4,2,4,3,4,1,4,3,4,2,4,3,4};
          cfg.ts_number_layers     = 5;
          cfg.ts_periodicity       = 16;
          cfg.ts_rate_decimator[0] = 16;
          cfg.ts_rate_decimator[1] = 8;
          cfg.ts_rate_decimator[2] = 4;
          cfg.ts_rate_decimator[3] = 2;
          cfg.ts_rate_decimator[4] = 1;
          memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
          flag_periodicity = cfg.ts_periodicity;
  
          layer_flags[0]  = VPX_EFLAG_FORCE_KF;
          layer_flags[1]  =
          layer_flags[3]  =
          layer_flags[5]  =
          layer_flags[7]  =
          layer_flags[9]  =
          layer_flags[11] =
          layer_flags[13] =
          layer_flags[15] = VP8_EFLAG_NO_UPD_LAST |
                            VP8_EFLAG_NO_UPD_GF   |
                            VP8_EFLAG_NO_UPD_ARF;
          layer_flags[2]  =
          layer_flags[6]  =
          layer_flags[10] =
          layer_flags[14] = VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_GF;
          layer_flags[4]  =
          layer_flags[12] = VP8_EFLAG_NO_REF_LAST |
                            VP8_EFLAG_NO_UPD_ARF;
          layer_flags[8]  = VP8_EFLAG_NO_REF_LAST | VP8_EFLAG_NO_REF_GF;
          break;
      }
  
      case 8:
      {
          /* 2-layers, with sync point at first frame of layer 1. */
          int ids[2] = {0,1};
          cfg.ts_number_layers     = 2;
          cfg.ts_periodicity       = 2;
          cfg.ts_rate_decimator[0] = 2;
          cfg.ts_rate_decimator[1] = 1;
          memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
          flag_periodicity = 8;
  
          /* 0=L, 1=GF */
          // ARF is used as predictor for all frames, and is only updated on
          // key frame. Sync point every 8 frames.
  
          // Layer 0: predict from L and ARF, update L and G.
          layer_flags[0] = VPX_EFLAG_FORCE_KF  |
                           VP8_EFLAG_NO_REF_GF |
                           VP8_EFLAG_NO_UPD_ARF;
  
          // Layer 1: sync point: predict from L and ARF, and update G.
          layer_flags[1] = VP8_EFLAG_NO_REF_GF |
                           VP8_EFLAG_NO_UPD_LAST |
                           VP8_EFLAG_NO_UPD_ARF;
  
          // Layer 0, predict from L and ARF, update L.
          layer_flags[2] = VP8_EFLAG_NO_REF_GF  |
                           VP8_EFLAG_NO_UPD_GF  |
                           VP8_EFLAG_NO_UPD_ARF;
  
          // Layer 1: predict from L, G and ARF, and update G.
          layer_flags[3] = VP8_EFLAG_NO_UPD_ARF |
                           VP8_EFLAG_NO_UPD_LAST |
                           VP8_EFLAG_NO_UPD_ENTROPY;
  
          // Layer 0
          layer_flags[4] = layer_flags[2];
  
          // Layer 1
          layer_flags[5] = layer_flags[3];
  
          // Layer 0
          layer_flags[6] = layer_flags[4];
  
          // Layer 1
          layer_flags[7] = layer_flags[5];
          break;
      }
  
      case 9:
      {
          /* 3-layers */
          // Sync points for layer 1 and 2 every 8 frames.
  
          int ids[4] = {0,2,1,2};
          cfg.ts_number_layers     = 3;
          cfg.ts_periodicity       = 4;
          cfg.ts_rate_decimator[0] = 4;
          cfg.ts_rate_decimator[1] = 2;
          cfg.ts_rate_decimator[2] = 1;
          memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
          flag_periodicity = 8;
  
          /* 0=L, 1=GF, 2=ARF */
          layer_flags[0] = VPX_EFLAG_FORCE_KF  |
                           VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[1] = VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF;
          layer_flags[2] = VP8_EFLAG_NO_REF_GF   | VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[3] =
          layer_flags[5] = VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF;
          layer_flags[4] = VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[6] = VP8_EFLAG_NO_REF_ARF |
                           VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_ARF;
          layer_flags[7] = VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF |
                           VP8_EFLAG_NO_UPD_ARF |
                           VP8_EFLAG_NO_UPD_ENTROPY;
          break;
      }
      case 10:
      {
          // 3-layers structure where ARF is used as predictor for all frames,
          // and is only updated on key frame.
          // Sync points for layer 1 and 2 every 8 frames.
  
          int ids[4] = {0,2,1,2};
          cfg.ts_number_layers     = 3;
          cfg.ts_periodicity       = 4;
          cfg.ts_rate_decimator[0] = 4;
          cfg.ts_rate_decimator[1] = 2;
          cfg.ts_rate_decimator[2] = 1;
          memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
          flag_periodicity = 8;
  
          /* 0=L, 1=GF, 2=ARF */
  
          // Layer 0: predict from L and ARF; update L and G.
          layer_flags[0] =  VPX_EFLAG_FORCE_KF  |
                            VP8_EFLAG_NO_UPD_ARF |
                            VP8_EFLAG_NO_REF_GF;
  
          // Layer 2: sync point: predict from L and ARF; update none.
          layer_flags[1] = VP8_EFLAG_NO_REF_GF |
                           VP8_EFLAG_NO_UPD_GF |
                           VP8_EFLAG_NO_UPD_ARF |
                           VP8_EFLAG_NO_UPD_LAST |
                           VP8_EFLAG_NO_UPD_ENTROPY;
  
          // Layer 1: sync point: predict from L and ARF; update G.
          layer_flags[2] = VP8_EFLAG_NO_REF_GF |
                           VP8_EFLAG_NO_UPD_ARF |
                           VP8_EFLAG_NO_UPD_LAST;
  
          // Layer 2: predict from L, G, ARF; update none.
          layer_flags[3] = VP8_EFLAG_NO_UPD_GF |
                           VP8_EFLAG_NO_UPD_ARF |
                           VP8_EFLAG_NO_UPD_LAST |
                           VP8_EFLAG_NO_UPD_ENTROPY;
  
          // Layer 0: predict from L and ARF; update L.
          layer_flags[4] = VP8_EFLAG_NO_UPD_GF |
                           VP8_EFLAG_NO_UPD_ARF |
                           VP8_EFLAG_NO_REF_GF;
  
          // Layer 2: predict from L, G, ARF; update none.
          layer_flags[5] = layer_flags[3];
  
          // Layer 1: predict from L, G, ARF; update G.
          layer_flags[6] = VP8_EFLAG_NO_UPD_ARF |
                           VP8_EFLAG_NO_UPD_LAST;
  
          // Layer 2: predict from L, G, ARF; update none.
          layer_flags[7] = layer_flags[3];
          break;
      }
      case 11:
      default:
      {
         // 3-layers structure as in case 10, but no sync/refresh points for
         // layer 1 and 2.
  
         int ids[4] = {0,2,1,2};
         cfg.ts_number_layers     = 3;
         cfg.ts_periodicity       = 4;
         cfg.ts_rate_decimator[0] = 4;
         cfg.ts_rate_decimator[1] = 2;
         cfg.ts_rate_decimator[2] = 1;
         memcpy(cfg.ts_layer_id, ids, sizeof(ids));
  
         flag_periodicity = 8;
  
         /* 0=L, 1=GF, 2=ARF */
  
         // Layer 0: predict from L and ARF; update L.
         layer_flags[0] = VP8_EFLAG_NO_UPD_GF |
                          VP8_EFLAG_NO_UPD_ARF |
                          VP8_EFLAG_NO_REF_GF;
         layer_flags[4] = layer_flags[0];
  
         // Layer 1: predict from L, G, ARF; update G.
         layer_flags[2] = VP8_EFLAG_NO_UPD_ARF |
                          VP8_EFLAG_NO_UPD_LAST;
         layer_flags[6] = layer_flags[2];
  
         // Layer 2: predict from L, G, ARF; update none.
         layer_flags[1] = VP8_EFLAG_NO_UPD_GF |
                          VP8_EFLAG_NO_UPD_ARF |
                          VP8_EFLAG_NO_UPD_LAST |
                          VP8_EFLAG_NO_UPD_ENTROPY;
         layer_flags[3] = layer_flags[1];
         layer_flags[5] = layer_flags[1];
         layer_flags[7] = layer_flags[1];
         break;
      }
      }
  
      /* Open input file */
      if(!(infile = fopen(argv[1], "rb")))
          die("Failed to open %s for reading", argv[1]);
  
      /* Open an output file for each stream */
      for (i=0; i<cfg.ts_number_layers; i++)
      {
          char file_name[512];
          sprintf (file_name, "%s_%d.ivf", argv[2], i);
          if (!(outfile[i] = fopen(file_name, "wb")))
              die("Failed to open %s for writing", file_name);
          write_ivf_file_header(outfile[i], &cfg, 0);
      }
  
      /* Initialize codec */
      if (vpx_codec_enc_init (&codec, interface, &cfg, 0))
          die_codec (&codec, "Failed to initialize encoder");
  
      /* Cap CPU & first I-frame size */
      vpx_codec_control (&codec, VP8E_SET_CPUUSED,                -6);
      vpx_codec_control (&codec, VP8E_SET_STATIC_THRESHOLD,      1);
      vpx_codec_control (&codec, VP8E_SET_NOISE_SENSITIVITY,       1);
      vpx_codec_control(&codec, VP8E_SET_TOKEN_PARTITIONS,       1);
  
      max_intra_size_pct = (int) (((double)cfg.rc_buf_optimal_sz * 0.5)
                           * ((double) cfg.g_timebase.den / cfg.g_timebase.num)
                           / 10.0);
      /* printf ("max_intra_size_pct=%d\n", max_intra_size_pct); */
  
      vpx_codec_control(&codec, VP8E_SET_MAX_INTRA_BITRATE_PCT,
                        max_intra_size_pct);
  
      frame_avail = 1;
      while (frame_avail || got_data) {
          vpx_codec_iter_t iter = NULL;
          const vpx_codec_cx_pkt_t *pkt;
  
          flags = layer_flags[frame_cnt % flag_periodicity];
  
          frame_avail = read_frame(infile, &raw);
          if (vpx_codec_encode(&codec, frame_avail? &raw : NULL, pts,
                              1, flags, VPX_DL_REALTIME))
              die_codec(&codec, "Failed to encode frame");
  
          /* Reset KF flag */
          if (layering_mode != 7)
              layer_flags[0] &= ~VPX_EFLAG_FORCE_KF;
  
          got_data = 0;
          while ( (pkt = vpx_codec_get_cx_data(&codec, &iter)) ) {
              got_data = 1;
              switch (pkt->kind) {
              case VPX_CODEC_CX_FRAME_PKT:
                  for (i=cfg.ts_layer_id[frame_cnt % cfg.ts_periodicity];
                                                i<cfg.ts_number_layers; i++)
                  {
                      write_ivf_frame_header(outfile[i], pkt);
                      (void) fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz,
                                    outfile[i]);
                      frames_in_layer[i]++;
                  }
                  break;
              default:
                  break;
              }
          }
          frame_cnt++;
          pts += frame_duration;
      }
      fclose (infile);
  
      printf ("Processed %d frames.\n",frame_cnt-1);
      if (vpx_codec_destroy(&codec))
              die_codec (&codec, "Failed to destroy codec");
  
      /* Try to rewrite the output file headers with the actual frame count */
      for (i=0; i<cfg.ts_number_layers; i++)
      {
          if (!fseek(outfile[i], 0, SEEK_SET))
              write_ivf_file_header (outfile[i], &cfg, frames_in_layer[i]);
          fclose (outfile[i]);
      }
  
      return EXIT_SUCCESS;
  }
  