examples/lightfield_bitstream_parsing.c - aom - Git at Google

 /*
  * Copyright (c) 2018, Alliance for Open Media. All rights reserved
  *
  * This source code is subject to the terms of the BSD 2 Clause License and
  * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
  * was not distributed with this source code in the LICENSE file, you can
  * obtain it at www.aomedia.org/license/software. If the Alliance for Open
  * Media Patent License 1.0 was not distributed with this source code in the
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */

 // Lightfield Bitstream Parsing
 // ============================
 //
 // This is a lightfield bitstream parsing example. It takes an input file
 // containing the whole compressed lightfield bitstream(ivf file), and parses it
 // and constructs and outputs a new bitstream that can be decoded by an AV1
 // decoder. The output bitstream contains reference frames(i.e. anchor frames),
 // camera frame header, and tile list OBUs. num_references is the number of
 // anchor frames coded at the beginning of the light field file.
 // After running the lightfield encoder, run lightfield bitstream parsing:
 // examples/lightfield_bitstream_parsing vase10x10.ivf vase_tile_list.ivf 4

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

 #include "aom/aom_decoder.h"
 #include "aom/aom_encoder.h"
 #include "aom/aom_integer.h"
 #include "aom/aomdx.h"
 #include "aom_dsp/bitwriter_buffer.h"
 #include "common/tools_common.h"
 #include "common/video_reader.h"
 #include "common/video_writer.h"

 static const char *exec_name;

 void usage_exit(void) {
   fprintf(stderr, "Usage: %s <infile> <outfile> <num_references> \n",
           exec_name);
   exit(EXIT_FAILURE);
 }

 #define ALIGN_POWER_OF_TWO(value, n) \
   (((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1))

 // SB size: 64x64
 const uint8_t output_frame_width_in_tiles_minus_1 = 512 / 64 - 1;
 const uint8_t output_frame_height_in_tiles_minus_1 = 512 / 64 - 1;

 // Spec:
 // typedef struct {
 //   uint8_t anchor_frame_idx;
 //   uint8_t tile_row;
 //   uint8_t tile_col;
 //   uint16_t coded_tile_data_size_minus_1;
 //   uint8_t *coded_tile_data;
 // } TILE_LIST_ENTRY;

 // Tile list entry provided by the application
 typedef struct {
   int image_idx;
   int reference_idx;
   int tile_col;
   int tile_row;
 } TILE_LIST_INFO;

 // M references: 0 - M-1; N images(including references): 0 - N-1;
 // Note: order the image index incrementally, so that we only go through the
 // bitstream once to construct the tile list.
 const int num_tile_lists = 2;
 const uint16_t tile_count_minus_1 = 9 - 1;
 const TILE_LIST_INFO tile_list[2][9] = {
   { { 16, 0, 4, 5 },
     { 83, 3, 13, 2 },
     { 57, 2, 2, 6 },
     { 31, 1, 11, 5 },
     { 2, 0, 7, 4 },
     { 77, 3, 9, 9 },
     { 49, 1, 0, 1 },
     { 6, 0, 3, 10 },
     { 63, 2, 5, 8 } },
   { { 65, 2, 11, 1 },
     { 42, 1, 3, 7 },
     { 88, 3, 8, 4 },
     { 76, 3, 1, 15 },
     { 1, 0, 2, 2 },
     { 19, 0, 5, 6 },
     { 60, 2, 4, 0 },
     { 25, 1, 11, 15 },
     { 50, 2, 5, 4 } },
 };

 int main(int argc, char **argv) {
   aom_codec_ctx_t codec;
   AvxVideoReader *reader = NULL;
   AvxVideoWriter *writer = NULL;
   const AvxInterface *decoder = NULL;
   const AvxVideoInfo *info = NULL;
   int width, height;
   int num_references;
   int n, i;
   aom_codec_pts_t pts;

   exec_name = argv[0];
   if (argc != 4) die("Invalid number of arguments.");

   reader = aom_video_reader_open(argv[1]);
   if (!reader) die("Failed to open %s for reading.", argv[1]);

   num_references = (int)strtol(argv[3], NULL, 0);
   info = aom_video_reader_get_info(reader);
   width = info->frame_width;
   height = info->frame_height;

   // The writer to write out ivf file in tile list OBU, which can be decoded by
   // AV1 decoder.
   writer = aom_video_writer_open(argv[2], kContainerIVF, info);
   if (!writer) die("Failed to open %s for writing", argv[2]);

   decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
   if (!decoder) die("Unknown input codec.");
   printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));

   if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
     die_codec(&codec, "Failed to initialize decoder.");

   // Decode anchor frames.
   aom_codec_control_(&codec, AV1_SET_TILE_MODE, 0);

   for (i = 0; i < num_references; ++i) {
     aom_video_reader_read_frame(reader);

     size_t frame_size = 0;
     const unsigned char *frame =
         aom_video_reader_get_frame(reader, &frame_size);
     pts = (aom_codec_pts_t)aom_video_reader_get_frame_pts(reader);

     // Copy references bitstream directly.
     if (!aom_video_writer_write_frame(writer, frame, frame_size, pts))
       die_codec(&codec, "Failed to copy compressed anchor frame.");

     if (aom_codec_decode(&codec, frame, frame_size, NULL))
       die_codec(&codec, "Failed to decode frame.");
   }

   // Decode camera frames.
   aom_codec_control_(&codec, AV1_SET_TILE_MODE, 1);
   aom_codec_control_(&codec, AV1D_EXT_TILE_DEBUG, 1);

   FILE *infile = aom_video_reader_get_file(reader);
   // Record the offset of the first camera image.
   const FileOffset camera_frame_pos = ftello(infile);

   // Read out the first camera frame.
   aom_video_reader_read_frame(reader);

   // Copy first camera frame for getting camera frame header. This is done
   // only once.
   {
     size_t frame_size = 0;
     const unsigned char *frame =
         aom_video_reader_get_frame(reader, &frame_size);
     pts = (aom_codec_pts_t)aom_video_reader_get_frame_pts(reader);
     aom_tile_data frame_header_info = { 0, NULL, 0 };

     // Need to decode frame header to get camera frame header info. So, here
     // decoding 1 tile is enough.
     aom_codec_control_(&codec, AV1_SET_DECODE_TILE_ROW, 0);
     aom_codec_control_(&codec, AV1_SET_DECODE_TILE_COL, 0);

     aom_codec_err_t aom_status =
         aom_codec_decode(&codec, frame, frame_size, NULL);
     if (aom_status) die_codec(&codec, "Failed to decode tile.");

     aom_codec_control_(&codec, AV1D_GET_FRAME_HEADER_INFO, &frame_header_info);

     size_t obu_size_offset =
         (uint8_t *)frame_header_info.coded_tile_data - frame;
     size_t length_field_size = frame_header_info.coded_tile_data_size;
     // Remove ext-tile tile info.
     uint32_t frame_header_size = (uint32_t)frame_header_info.extra_size - 1;
     size_t bytes_to_copy =
         obu_size_offset + length_field_size + frame_header_size;

     unsigned char *frame_hdr_buf = (unsigned char *)malloc(bytes_to_copy);
     if (frame_hdr_buf == NULL)
       die_codec(&codec, "Failed to allocate frame header buffer.");

     memcpy(frame_hdr_buf, frame, bytes_to_copy);

     // Update frame header OBU size.
     size_t bytes_written = 0;
     if (aom_uleb_encode_fixed_size(
             frame_header_size, length_field_size, length_field_size,
             frame_hdr_buf + obu_size_offset, &bytes_written))
       die_codec(&codec, "Failed to encode the tile list obu size.");

     // Copy camera frame header bitstream.
     if (!aom_video_writer_write_frame(writer, frame_hdr_buf, bytes_to_copy,
                                       pts))
       die_codec(&codec, "Failed to copy compressed camera frame header.");
   }

   // Allocate a buffer to store tile list bitstream. Image format
   // AOM_IMG_FMT_I420.
   size_t data_sz =
       ALIGN_POWER_OF_TWO(width, 5) * ALIGN_POWER_OF_TWO(height, 5) * 12 / 8;
   unsigned char *tl_buf = (unsigned char *)malloc(data_sz);
   if (tl_buf == NULL) die_codec(&codec, "Failed to allocate tile list buffer.");

   aom_codec_pts_t tl_pts = pts;

   // Process 1 tile list.
   for (n = 0; n < num_tile_lists; n++) {
     unsigned char *tl = tl_buf;
     struct aom_write_bit_buffer wb = { tl, 0 };
     unsigned char *saved_obu_size_loc = NULL;
     uint32_t tile_list_obu_header_size = 0;
     uint32_t tile_list_obu_size = 0;

     // Write the tile list OBU header that is 1 byte long.
     aom_wb_write_literal(&wb, 0, 1);  // forbidden bit.
     aom_wb_write_literal(&wb, 8, 4);  // tile list OBU: "1000"
     aom_wb_write_literal(&wb, 0, 1);  // obu_extension = 0
     aom_wb_write_literal(&wb, 1, 1);  // obu_has_size_field
     aom_wb_write_literal(&wb, 0, 1);  // reserved
     tl++;
     tile_list_obu_header_size++;

     // Write the OBU size using a fixed length_field_size of 4 bytes.
     saved_obu_size_loc = tl;
     aom_wb_write_literal(&wb, 0, 32);
     tl += 4;
     tile_list_obu_header_size += 4;

     // write_tile_list_obu()
     aom_wb_write_literal(&wb, output_frame_width_in_tiles_minus_1, 8);
     aom_wb_write_literal(&wb, output_frame_height_in_tiles_minus_1, 8);
     aom_wb_write_literal(&wb, tile_count_minus_1, 16);
     tl += 4;
     tile_list_obu_size += 4;

     // Write each tile's data
     for (i = 0; i <= tile_count_minus_1; i++) {
       aom_tile_data tile_data = { 0, NULL, 0 };

       int image_idx = tile_list[n][i].image_idx;
       int ref_idx = tile_list[n][i].reference_idx;
       int tc = tile_list[n][i].tile_col;
       int tr = tile_list[n][i].tile_row;
       int frame_cnt = -1;

       // Reset bit writer to the right location.
       wb.bit_buffer = tl;
       wb.bit_offset = 0;

       // Seek to the first camera image.
       fseeko(infile, camera_frame_pos, SEEK_SET);

       // Read out the camera image
       while (frame_cnt != image_idx) {
         aom_video_reader_read_frame(reader);
         frame_cnt++;
       }

       size_t frame_size = 0;
       const unsigned char *frame =
           aom_video_reader_get_frame(reader, &frame_size);

       aom_codec_control_(&codec, AV1_SET_DECODE_TILE_ROW, tr);
       aom_codec_control_(&codec, AV1_SET_DECODE_TILE_COL, tc);

       aom_codec_err_t aom_status =
           aom_codec_decode(&codec, frame, frame_size, NULL);
       if (aom_status) die_codec(&codec, "Failed to decode tile.");

       aom_codec_control_(&codec, AV1D_GET_TILE_DATA, &tile_data);

       // Copy over tile info.
       //  uint8_t anchor_frame_idx;
       //  uint8_t tile_row;
       //  uint8_t tile_col;
       //  uint16_t coded_tile_data_size_minus_1;
       //  uint8_t *coded_tile_data;
       uint32_t tile_info_bytes = 5;
       aom_wb_write_literal(&wb, ref_idx, 8);
       aom_wb_write_literal(&wb, tr, 8);
       aom_wb_write_literal(&wb, tc, 8);
       aom_wb_write_literal(&wb, (int)tile_data.coded_tile_data_size - 1, 16);
       tl += tile_info_bytes;

       memcpy(tl, (uint8_t *)tile_data.coded_tile_data,
              tile_data.coded_tile_data_size);
       tl += tile_data.coded_tile_data_size;

       tile_list_obu_size +=
           tile_info_bytes + (uint32_t)tile_data.coded_tile_data_size;
     }

     // Write tile list OBU size.
     size_t bytes_written = 0;
     if (aom_uleb_encode_fixed_size(tile_list_obu_size, 4, 4, saved_obu_size_loc,
                                    &bytes_written))
       die_codec(&codec, "Failed to encode the tile list obu size.");

     // Copy the tile list.
     if (!aom_video_writer_write_frame(
             writer, tl_buf, tile_list_obu_header_size + tile_list_obu_size,
             tl_pts))
       die_codec(&codec, "Failed to copy compressed tile list.");

     tl_pts++;
   }

   free(tl_buf);
   if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
   aom_video_writer_close(writer);
   aom_video_reader_close(reader);

   return EXIT_SUCCESS;
 }
	/*
	* Copyright (c) 2018, Alliance for Open Media. All rights reserved
	*
	* This source code is subject to the terms of the BSD 2 Clause License and
	* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
	* was not distributed with this source code in the LICENSE file, you can
	* obtain it at www.aomedia.org/license/software. If the Alliance for Open
	* Media Patent License 1.0 was not distributed with this source code in the
	* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
	*/

	// Lightfield Bitstream Parsing
	// ============================
	//
	// This is a lightfield bitstream parsing example. It takes an input file
	// containing the whole compressed lightfield bitstream(ivf file), and parses it
	// and constructs and outputs a new bitstream that can be decoded by an AV1
	// decoder. The output bitstream contains reference frames(i.e. anchor frames),
	// camera frame header, and tile list OBUs. num_references is the number of
	// anchor frames coded at the beginning of the light field file.
	// After running the lightfield encoder, run lightfield bitstream parsing:
	// examples/lightfield_bitstream_parsing vase10x10.ivf vase_tile_list.ivf 4

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>

	#include "aom/aom_decoder.h"
	#include "aom/aom_encoder.h"
	#include "aom/aom_integer.h"
	#include "aom/aomdx.h"
	#include "aom_dsp/bitwriter_buffer.h"
	#include "common/tools_common.h"
	#include "common/video_reader.h"
	#include "common/video_writer.h"

	static const char *exec_name;

	void usage_exit(void) {
	fprintf(stderr, "Usage: %s <infile> <outfile> <num_references> \n",
	exec_name);
	exit(EXIT_FAILURE);
	}

	#define ALIGN_POWER_OF_TWO(value, n) \
	(((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1))

	// SB size: 64x64
	const uint8_t output_frame_width_in_tiles_minus_1 = 512 / 64 - 1;
	const uint8_t output_frame_height_in_tiles_minus_1 = 512 / 64 - 1;

	// Spec:
	// typedef struct {
	// uint8_t anchor_frame_idx;
	// uint8_t tile_row;
	// uint8_t tile_col;
	// uint16_t coded_tile_data_size_minus_1;
	// uint8_t *coded_tile_data;
	// } TILE_LIST_ENTRY;

	// Tile list entry provided by the application
	typedef struct {
	int image_idx;
	int reference_idx;
	int tile_col;
	int tile_row;
	} TILE_LIST_INFO;

	// M references: 0 - M-1; N images(including references): 0 - N-1;
	// Note: order the image index incrementally, so that we only go through the
	// bitstream once to construct the tile list.
	const int num_tile_lists = 2;
	const uint16_t tile_count_minus_1 = 9 - 1;
	const TILE_LIST_INFO tile_list[2][9] = {
	{ { 16, 0, 4, 5 },
	{ 83, 3, 13, 2 },
	{ 57, 2, 2, 6 },
	{ 31, 1, 11, 5 },
	{ 2, 0, 7, 4 },
	{ 77, 3, 9, 9 },
	{ 49, 1, 0, 1 },
	{ 6, 0, 3, 10 },
	{ 63, 2, 5, 8 } },
	{ { 65, 2, 11, 1 },
	{ 42, 1, 3, 7 },
	{ 88, 3, 8, 4 },
	{ 76, 3, 1, 15 },
	{ 1, 0, 2, 2 },
	{ 19, 0, 5, 6 },
	{ 60, 2, 4, 0 },
	{ 25, 1, 11, 15 },
	{ 50, 2, 5, 4 } },
	};

	int main(int argc, char **argv) {
	aom_codec_ctx_t codec;
	AvxVideoReader *reader = NULL;
	AvxVideoWriter *writer = NULL;
	const AvxInterface *decoder = NULL;
	const AvxVideoInfo *info = NULL;
	int width, height;
	int num_references;
	int n, i;
	aom_codec_pts_t pts;

	exec_name = argv[0];
	if (argc != 4) die("Invalid number of arguments.");

	reader = aom_video_reader_open(argv[1]);
	if (!reader) die("Failed to open %s for reading.", argv[1]);

	num_references = (int)strtol(argv[3], NULL, 0);
	info = aom_video_reader_get_info(reader);
	width = info->frame_width;
	height = info->frame_height;

	// The writer to write out ivf file in tile list OBU, which can be decoded by
	// AV1 decoder.
	writer = aom_video_writer_open(argv[2], kContainerIVF, info);
	if (!writer) die("Failed to open %s for writing", argv[2]);

	decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
	if (!decoder) die("Unknown input codec.");
	printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));

	if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
	die_codec(&codec, "Failed to initialize decoder.");

	// Decode anchor frames.
	aom_codec_control_(&codec, AV1_SET_TILE_MODE, 0);

	for (i = 0; i < num_references; ++i) {
	aom_video_reader_read_frame(reader);

	size_t frame_size = 0;
	const unsigned char *frame =
	aom_video_reader_get_frame(reader, &frame_size);
	pts = (aom_codec_pts_t)aom_video_reader_get_frame_pts(reader);

	// Copy references bitstream directly.
	if (!aom_video_writer_write_frame(writer, frame, frame_size, pts))
	die_codec(&codec, "Failed to copy compressed anchor frame.");

	if (aom_codec_decode(&codec, frame, frame_size, NULL))
	die_codec(&codec, "Failed to decode frame.");
	}

	// Decode camera frames.
	aom_codec_control_(&codec, AV1_SET_TILE_MODE, 1);
	aom_codec_control_(&codec, AV1D_EXT_TILE_DEBUG, 1);

	FILE *infile = aom_video_reader_get_file(reader);
	// Record the offset of the first camera image.
	const FileOffset camera_frame_pos = ftello(infile);

	// Read out the first camera frame.
	aom_video_reader_read_frame(reader);

	// Copy first camera frame for getting camera frame header. This is done
	// only once.
	{
	size_t frame_size = 0;
	const unsigned char *frame =
	aom_video_reader_get_frame(reader, &frame_size);
	pts = (aom_codec_pts_t)aom_video_reader_get_frame_pts(reader);
	aom_tile_data frame_header_info = { 0, NULL, 0 };

	// Need to decode frame header to get camera frame header info. So, here
	// decoding 1 tile is enough.
	aom_codec_control_(&codec, AV1_SET_DECODE_TILE_ROW, 0);
	aom_codec_control_(&codec, AV1_SET_DECODE_TILE_COL, 0);

	aom_codec_err_t aom_status =
	aom_codec_decode(&codec, frame, frame_size, NULL);
	if (aom_status) die_codec(&codec, "Failed to decode tile.");

	aom_codec_control_(&codec, AV1D_GET_FRAME_HEADER_INFO, &frame_header_info);

	size_t obu_size_offset =
	(uint8_t *)frame_header_info.coded_tile_data - frame;
	size_t length_field_size = frame_header_info.coded_tile_data_size;
	// Remove ext-tile tile info.
	uint32_t frame_header_size = (uint32_t)frame_header_info.extra_size - 1;
	size_t bytes_to_copy =
	obu_size_offset + length_field_size + frame_header_size;

	unsigned char frame_hdr_buf = (unsigned char )malloc(bytes_to_copy);
	if (frame_hdr_buf == NULL)
	die_codec(&codec, "Failed to allocate frame header buffer.");

	memcpy(frame_hdr_buf, frame, bytes_to_copy);

	// Update frame header OBU size.
	size_t bytes_written = 0;
	if (aom_uleb_encode_fixed_size(
	frame_header_size, length_field_size, length_field_size,
	frame_hdr_buf + obu_size_offset, &bytes_written))
	die_codec(&codec, "Failed to encode the tile list obu size.");

	// Copy camera frame header bitstream.
	if (!aom_video_writer_write_frame(writer, frame_hdr_buf, bytes_to_copy,
	pts))
	die_codec(&codec, "Failed to copy compressed camera frame header.");
	}

	// Allocate a buffer to store tile list bitstream. Image format
	// AOM_IMG_FMT_I420.
	size_t data_sz =
	ALIGN_POWER_OF_TWO(width, 5) * ALIGN_POWER_OF_TWO(height, 5) * 12 / 8;
	unsigned char tl_buf = (unsigned char )malloc(data_sz);
	if (tl_buf == NULL) die_codec(&codec, "Failed to allocate tile list buffer.");

	aom_codec_pts_t tl_pts = pts;

	// Process 1 tile list.
	for (n = 0; n < num_tile_lists; n++) {
	unsigned char *tl = tl_buf;
	struct aom_write_bit_buffer wb = { tl, 0 };
	unsigned char *saved_obu_size_loc = NULL;
	uint32_t tile_list_obu_header_size = 0;
	uint32_t tile_list_obu_size = 0;

	// Write the tile list OBU header that is 1 byte long.
	aom_wb_write_literal(&wb, 0, 1); // forbidden bit.
	aom_wb_write_literal(&wb, 8, 4); // tile list OBU: "1000"
	aom_wb_write_literal(&wb, 0, 1); // obu_extension = 0
	aom_wb_write_literal(&wb, 1, 1); // obu_has_size_field
	aom_wb_write_literal(&wb, 0, 1); // reserved
	tl++;
	tile_list_obu_header_size++;

	// Write the OBU size using a fixed length_field_size of 4 bytes.
	saved_obu_size_loc = tl;
	aom_wb_write_literal(&wb, 0, 32);
	tl += 4;
	tile_list_obu_header_size += 4;

	// write_tile_list_obu()
	aom_wb_write_literal(&wb, output_frame_width_in_tiles_minus_1, 8);
	aom_wb_write_literal(&wb, output_frame_height_in_tiles_minus_1, 8);
	aom_wb_write_literal(&wb, tile_count_minus_1, 16);
	tl += 4;
	tile_list_obu_size += 4;

	// Write each tile's data
	for (i = 0; i <= tile_count_minus_1; i++) {
	aom_tile_data tile_data = { 0, NULL, 0 };

	int image_idx = tile_list[n][i].image_idx;
	int ref_idx = tile_list[n][i].reference_idx;
	int tc = tile_list[n][i].tile_col;
	int tr = tile_list[n][i].tile_row;
	int frame_cnt = -1;

	// Reset bit writer to the right location.
	wb.bit_buffer = tl;
	wb.bit_offset = 0;

	// Seek to the first camera image.
	fseeko(infile, camera_frame_pos, SEEK_SET);

	// Read out the camera image
	while (frame_cnt != image_idx) {
	aom_video_reader_read_frame(reader);
	frame_cnt++;
	}

	size_t frame_size = 0;
	const unsigned char *frame =
	aom_video_reader_get_frame(reader, &frame_size);

	aom_codec_control_(&codec, AV1_SET_DECODE_TILE_ROW, tr);
	aom_codec_control_(&codec, AV1_SET_DECODE_TILE_COL, tc);

	aom_codec_err_t aom_status =
	aom_codec_decode(&codec, frame, frame_size, NULL);
	if (aom_status) die_codec(&codec, "Failed to decode tile.");

	aom_codec_control_(&codec, AV1D_GET_TILE_DATA, &tile_data);

	// Copy over tile info.
	// uint8_t anchor_frame_idx;
	// uint8_t tile_row;
	// uint8_t tile_col;
	// uint16_t coded_tile_data_size_minus_1;
	// uint8_t *coded_tile_data;
	uint32_t tile_info_bytes = 5;
	aom_wb_write_literal(&wb, ref_idx, 8);
	aom_wb_write_literal(&wb, tr, 8);
	aom_wb_write_literal(&wb, tc, 8);
	aom_wb_write_literal(&wb, (int)tile_data.coded_tile_data_size - 1, 16);
	tl += tile_info_bytes;

	memcpy(tl, (uint8_t *)tile_data.coded_tile_data,
	tile_data.coded_tile_data_size);
	tl += tile_data.coded_tile_data_size;

	tile_list_obu_size +=
	tile_info_bytes + (uint32_t)tile_data.coded_tile_data_size;
	}

	// Write tile list OBU size.
	size_t bytes_written = 0;
	if (aom_uleb_encode_fixed_size(tile_list_obu_size, 4, 4, saved_obu_size_loc,
	&bytes_written))
	die_codec(&codec, "Failed to encode the tile list obu size.");

	// Copy the tile list.
	if (!aom_video_writer_write_frame(
	writer, tl_buf, tile_list_obu_header_size + tile_list_obu_size,
	tl_pts))
	die_codec(&codec, "Failed to copy compressed tile list.");

	tl_pts++;
	}

	free(tl_buf);
	if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
	aom_video_writer_close(writer);
	aom_video_reader_close(reader);

	return EXIT_SUCCESS;
	}