examples/lightfield_decoder.c - aom - Git at Google

 /*
  * Copyright (c) 2017, 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 Decoder
 // ==================
 //
 // This is an example of a simple lightfield decoder. It builds upon the
 // simple_decoder.c example.  It takes an input file containing the compressed
 // data (in ivf format), treating it as a lightfield instead of a video; and a
 // text file with a list of tiles to decode. There is an optional parameter
 // allowing to choose the output format, and the supported formats are
 // YUV1D(default), YUV, and NV12.
 // After running the lightfield encoder, run lightfield decoder to decode a
 // batch of tiles:
 // examples/lightfield_decoder vase10x10.ivf vase_reference.yuv 4 tile_list.txt
 // 0(optional)
 // The tile_list.txt is expected to be of the form:
 // Frame <frame_index0>
 // <image_index0> <anchor_index0> <tile_col0> <tile_row0>
 // <image_index1> <anchor_index1> <tile_col1> <tile_row1>
 // ...
 // Frame <frame_index1)
 // ...
 //
 // The "Frame" markers indicate a new render frame and thus a new tile list
 // will be started and the old one flushed.  The image_indexN, anchor_indexN,
 // tile_colN, and tile_rowN identify an individual tile to be decoded and
 // to use anchor_indexN anchor image for MCP.

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

 #include "aom/aom_decoder.h"
 #include "aom/aomdx.h"
 #include "aom_scale/yv12config.h"
 #include "av1/common/enums.h"
 #include "common/tools_common.h"
 #include "common/video_reader.h"

 static const char *exec_name;

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

 // Output frame size
 const int output_frame_width = 512;
 const int output_frame_height = 512;

 static void aom_img_copy_tile(const aom_image_t *src, const aom_image_t *dst,
                               int dst_row_offset, int dst_col_offset) {
   const int shift = (src->fmt & AOM_IMG_FMT_HIGHBITDEPTH) ? 1 : 0;
   int plane;

   for (plane = 0; plane < 3; ++plane) {
     const unsigned char *src_buf = src->planes[plane];
     const int src_stride = src->stride[plane];
     unsigned char *dst_buf = dst->planes[plane];
     const int dst_stride = dst->stride[plane];
     const int roffset =
         (plane > 0) ? dst_row_offset >> dst->y_chroma_shift : dst_row_offset;
     const int coffset =
         (plane > 0) ? dst_col_offset >> dst->x_chroma_shift : dst_col_offset;

     // col offset needs to be adjusted for HBD.
     dst_buf += roffset * dst_stride + (coffset << shift);

     const int w = (aom_img_plane_width(src, plane) << shift);
     const int h = aom_img_plane_height(src, plane);
     int y;

     for (y = 0; y < h; ++y) {
       memcpy(dst_buf, src_buf, w);
       src_buf += src_stride;
       dst_buf += dst_stride;
     }
   }
 }

 void decode_tile(aom_codec_ctx_t *codec, const unsigned char *frame,
                  size_t frame_size, int tr, int tc, int ref_idx,
                  aom_image_t *reference_images, aom_image_t *output,
                  int *tile_idx, unsigned int *output_bit_depth,
                  aom_image_t **img_ptr, int output_format) {
   AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_TILE_MODE, 1);
   AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_EXT_TILE_DEBUG, 1);
   AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_ROW, tr);
   AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_COL, tc);

   av1_ref_frame_t ref;
   ref.idx = 0;
   ref.use_external_ref = 1;
   ref.img = reference_images[ref_idx];
   if (AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_REFERENCE, &ref)) {
     die_codec(codec, "Failed to set reference frame.");
   }

   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_iter_t iter = NULL;
   aom_image_t *img = aom_codec_get_frame(codec, &iter);
   if (!img) die_codec(codec, "Failed to get frame.");
   *img_ptr = img;

   // aom_img_alloc() sets bit_depth as follows:
   // output->bit_depth = (fmt & AOM_IMG_FMT_HIGHBITDEPTH) ? 16 : 8;
   // Use img->bit_depth(read from bitstream), so that aom_shift_img()
   // works as expected.
   output->bit_depth = img->bit_depth;
   *output_bit_depth = img->bit_depth;

   if (output_format != YUV1D) {
     // read out the tile size.
     unsigned int tile_size = 0;
     if (AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_GET_TILE_SIZE, &tile_size))
       die_codec(codec, "Failed to get the tile size");
     const unsigned int tile_width = tile_size >> 16;
     const unsigned int tile_height = tile_size & 65535;
     const uint32_t output_frame_width_in_tiles =
         output_frame_width / tile_width;

     // Copy the tile to the output frame.
     const int row_offset =
         (*tile_idx / output_frame_width_in_tiles) * tile_height;
     const int col_offset =
         (*tile_idx % output_frame_width_in_tiles) * tile_width;

     aom_img_copy_tile(img, output, row_offset, col_offset);
     (*tile_idx)++;
   }
 }

 static void img_write_to_file(const aom_image_t *img, FILE *file,
                               int output_format) {
   if (output_format == YUV)
     aom_img_write(img, file);
   else if (output_format == NV12)
     aom_img_write_nv12(img, file);
   else
     die("Invalid output format");
 }

 int main(int argc, char **argv) {
   FILE *outfile = NULL;
   AvxVideoReader *reader = NULL;
   const AvxVideoInfo *info = NULL;
   int num_references;
   aom_img_fmt_t ref_fmt = 0;
   aom_image_t reference_images[MAX_EXTERNAL_REFERENCES];
   aom_image_t output;
   aom_image_t *output_shifted = NULL;
   size_t frame_size = 0;
   const unsigned char *frame = NULL;
   int i, j;
   const char *tile_list_file = NULL;
   int output_format = YUV1D;
   exec_name = argv[0];

   if (argc < 5) die("Invalid number of arguments.");

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

   if (!(outfile = fopen(argv[2], "wb")))
     die("Failed to open %s for writing.", argv[2]);

   num_references = (int)strtol(argv[3], NULL, 0);
   tile_list_file = argv[4];

   if (argc > 5) output_format = (int)strtol(argv[5], NULL, 0);
   if (output_format < YUV1D || output_format > NV12)
     die("Output format out of range [0, 2]");

   info = aom_video_reader_get_info(reader);

   aom_codec_iface_t *decoder;
   if (info->codec_fourcc == LST_FOURCC)
     decoder = get_aom_decoder_by_fourcc(AV1_FOURCC);
   else
     die("Unknown input codec.");
   printf("Using %s\n", aom_codec_iface_name(decoder));

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

   if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_SET_IS_ANNEXB,
                                     info->is_annexb)) {
     die("Failed to set annex b status");
   }

   // Decode anchor frames.
   AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 0);
   for (i = 0; i < num_references; ++i) {
     aom_video_reader_read_frame(reader);
     frame = aom_video_reader_get_frame(reader, &frame_size);
     if (aom_codec_decode(&codec, frame, frame_size, NULL))
       die_codec(&codec, "Failed to decode frame.");

     if (i == 0) {
       if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_IMG_FORMAT, &ref_fmt))
         die_codec(&codec, "Failed to get the image format");

       int frame_res[2];
       if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_FRAME_SIZE, frame_res))
         die_codec(&codec, "Failed to get the image frame size");

       // Allocate memory to store decoded references. Allocate memory with the
       // border so that it can be used as a reference.
       for (j = 0; j < num_references; j++) {
         unsigned int border = AOM_DEC_BORDER_IN_PIXELS;
         if (!aom_img_alloc_with_border(&reference_images[j], ref_fmt,
                                        frame_res[0], frame_res[1], 32, 8,
                                        border)) {
           die("Failed to allocate references.");
         }
       }
     }

     if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_COPY_NEW_FRAME_IMAGE,
                                       &reference_images[i]))
       die_codec(&codec, "Failed to copy decoded reference frame");

     aom_codec_iter_t iter = NULL;
     aom_image_t *img = NULL;
     while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) {
       char name[1024];
       snprintf(name, sizeof(name), "ref_%d.yuv", i);
       printf("writing ref image to %s, %u, %u\n", name, img->d_w, img->d_h);
       FILE *ref_file = fopen(name, "wb");
       aom_img_write(img, ref_file);
       fclose(ref_file);
     }
   }

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

   printf("Loading compressed frames into memory.\n");

   // Count the frames in the lightfield.
   int num_frames = 0;
   while (aom_video_reader_read_frame(reader)) {
     ++num_frames;
   }
   if (num_frames < 1) die("Input light field has no frames.");

   // Read all of the lightfield frames into memory.
   unsigned char **frames =
       (unsigned char **)malloc(num_frames * sizeof(unsigned char *));
   size_t *frame_sizes = (size_t *)malloc(num_frames * sizeof(size_t));
   // Seek to the first camera image.
   fseeko(infile, camera_frame_pos, SEEK_SET);
   for (int f = 0; f < num_frames; ++f) {
     aom_video_reader_read_frame(reader);
     frame = aom_video_reader_get_frame(reader, &frame_size);
     frames[f] = (unsigned char *)malloc(frame_size * sizeof(unsigned char));
     memcpy(frames[f], frame, frame_size);
     frame_sizes[f] = frame_size;
   }
   printf("Read %d frames.\n", num_frames);

   if (output_format != YUV1D) {
     // Allocate the output frame.
     aom_img_fmt_t out_fmt = ref_fmt;
     if (FORCE_HIGHBITDEPTH_DECODING) out_fmt |= AOM_IMG_FMT_HIGHBITDEPTH;
     if (!aom_img_alloc(&output, out_fmt, output_frame_width,
                        output_frame_height, 32))
       die("Failed to allocate output image.");
   }

   printf("Decoding tile list from file.\n");
   char line[1024];
   FILE *tile_list_fptr = fopen(tile_list_file, "r");
   if (!tile_list_fptr) die_codec(&codec, "Failed to open tile list file.");
   int tile_list_cnt = 0;
   int tile_list_writes = 0;
   int tile_idx = 0;
   aom_image_t *out = NULL;
   unsigned int output_bit_depth = 0;

   while ((fgets(line, 1024, tile_list_fptr)) != NULL) {
     if (line[0] == 'F') {
       if (output_format != YUV1D) {
         // Write out the tile list.
         if (tile_list_cnt) {
           out = &output;
           if (output_bit_depth != 0)
             aom_shift_img(output_bit_depth, &out, &output_shifted);
           img_write_to_file(out, outfile, output_format);
           tile_list_writes++;
         }

         tile_list_cnt++;
         tile_idx = 0;
         // Then memset the frame.
         memset(output.img_data, 0, output.sz);
       }
       continue;
     }

     int image_idx, ref_idx, tc, tr;
     sscanf(line, "%d %d %d %d", &image_idx, &ref_idx, &tc, &tr);
     if (image_idx >= num_frames) {
       die("Tile list image_idx out of bounds: %d >= %d.", image_idx,
           num_frames);
     }
     if (ref_idx >= num_references) {
       die("Tile list ref_idx out of bounds: %d >= %d.", ref_idx,
           num_references);
     }
     frame = frames[image_idx];
     frame_size = frame_sizes[image_idx];

     aom_image_t *img = NULL;
     decode_tile(&codec, frame, frame_size, tr, tc, ref_idx, reference_images,
                 &output, &tile_idx, &output_bit_depth, &img, output_format);
     if (output_format == YUV1D) {
       out = img;
       if (output_bit_depth != 0)
         aom_shift_img(output_bit_depth, &out, &output_shifted);
       aom_img_write(out, outfile);
     }
   }

   if (output_format != YUV1D) {
     // Write out the last tile list.
     if (tile_list_writes < tile_list_cnt) {
       out = &output;
       if (output_bit_depth != 0)
         aom_shift_img(output_bit_depth, &out, &output_shifted);
       img_write_to_file(out, outfile, output_format);
     }
   }

   if (output_shifted) aom_img_free(output_shifted);
   if (output_format != YUV1D) aom_img_free(&output);
   for (i = 0; i < num_references; i++) aom_img_free(&reference_images[i]);
   for (int f = 0; f < num_frames; ++f) {
     free(frames[f]);
   }
   free(frame_sizes);
   free(frames);
   if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
   aom_video_reader_close(reader);
   fclose(outfile);

   return EXIT_SUCCESS;
 }
	/*
	* Copyright (c) 2017, 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 Decoder
	// ==================
	//
	// This is an example of a simple lightfield decoder. It builds upon the
	// simple_decoder.c example. It takes an input file containing the compressed
	// data (in ivf format), treating it as a lightfield instead of a video; and a
	// text file with a list of tiles to decode. There is an optional parameter
	// allowing to choose the output format, and the supported formats are
	// YUV1D(default), YUV, and NV12.
	// After running the lightfield encoder, run lightfield decoder to decode a
	// batch of tiles:
	// examples/lightfield_decoder vase10x10.ivf vase_reference.yuv 4 tile_list.txt
	// 0(optional)
	// The tile_list.txt is expected to be of the form:
	// Frame <frame_index0>
	// <image_index0> <anchor_index0> <tile_col0> <tile_row0>
	// <image_index1> <anchor_index1> <tile_col1> <tile_row1>
	// ...
	// Frame <frame_index1)
	// ...
	//
	// The "Frame" markers indicate a new render frame and thus a new tile list
	// will be started and the old one flushed. The image_indexN, anchor_indexN,
	// tile_colN, and tile_rowN identify an individual tile to be decoded and
	// to use anchor_indexN anchor image for MCP.

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

	#include "aom/aom_decoder.h"
	#include "aom/aomdx.h"
	#include "aom_scale/yv12config.h"
	#include "av1/common/enums.h"
	#include "common/tools_common.h"
	#include "common/video_reader.h"

	static const char *exec_name;

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

	// Output frame size
	const int output_frame_width = 512;
	const int output_frame_height = 512;

	static void aom_img_copy_tile(const aom_image_t src, const aom_image_t dst,
	int dst_row_offset, int dst_col_offset) {
	const int shift = (src->fmt & AOM_IMG_FMT_HIGHBITDEPTH) ? 1 : 0;
	int plane;

	for (plane = 0; plane < 3; ++plane) {
	const unsigned char *src_buf = src->planes[plane];
	const int src_stride = src->stride[plane];
	unsigned char *dst_buf = dst->planes[plane];
	const int dst_stride = dst->stride[plane];
	const int roffset =
	(plane > 0) ? dst_row_offset >> dst->y_chroma_shift : dst_row_offset;
	const int coffset =
	(plane > 0) ? dst_col_offset >> dst->x_chroma_shift : dst_col_offset;

	// col offset needs to be adjusted for HBD.
	dst_buf += roffset * dst_stride + (coffset << shift);

	const int w = (aom_img_plane_width(src, plane) << shift);
	const int h = aom_img_plane_height(src, plane);
	int y;

	for (y = 0; y < h; ++y) {
	memcpy(dst_buf, src_buf, w);
	src_buf += src_stride;
	dst_buf += dst_stride;
	}
	}
	}

	void decode_tile(aom_codec_ctx_t codec, const unsigned char frame,
	size_t frame_size, int tr, int tc, int ref_idx,
	aom_image_t reference_images, aom_image_t output,
	int tile_idx, unsigned int output_bit_depth,
	aom_image_t **img_ptr, int output_format) {
	AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_TILE_MODE, 1);
	AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_EXT_TILE_DEBUG, 1);
	AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_ROW, tr);
	AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_COL, tc);

	av1_ref_frame_t ref;
	ref.idx = 0;
	ref.use_external_ref = 1;
	ref.img = reference_images[ref_idx];
	if (AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_REFERENCE, &ref)) {
	die_codec(codec, "Failed to set reference frame.");
	}

	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_iter_t iter = NULL;
	aom_image_t *img = aom_codec_get_frame(codec, &iter);
	if (!img) die_codec(codec, "Failed to get frame.");
	*img_ptr = img;

	// aom_img_alloc() sets bit_depth as follows:
	// output->bit_depth = (fmt & AOM_IMG_FMT_HIGHBITDEPTH) ? 16 : 8;
	// Use img->bit_depth(read from bitstream), so that aom_shift_img()
	// works as expected.
	output->bit_depth = img->bit_depth;
	*output_bit_depth = img->bit_depth;

	if (output_format != YUV1D) {
	// read out the tile size.
	unsigned int tile_size = 0;
	if (AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_GET_TILE_SIZE, &tile_size))
	die_codec(codec, "Failed to get the tile size");
	const unsigned int tile_width = tile_size >> 16;
	const unsigned int tile_height = tile_size & 65535;
	const uint32_t output_frame_width_in_tiles =
	output_frame_width / tile_width;

	// Copy the tile to the output frame.
	const int row_offset =
	(tile_idx / output_frame_width_in_tiles) tile_height;
	const int col_offset =
	(tile_idx % output_frame_width_in_tiles) tile_width;

	aom_img_copy_tile(img, output, row_offset, col_offset);
	(*tile_idx)++;
	}
	}

	static void img_write_to_file(const aom_image_t img, FILE file,
	int output_format) {
	if (output_format == YUV)
	aom_img_write(img, file);
	else if (output_format == NV12)
	aom_img_write_nv12(img, file);
	else
	die("Invalid output format");
	}

	int main(int argc, char **argv) {
	FILE *outfile = NULL;
	AvxVideoReader *reader = NULL;
	const AvxVideoInfo *info = NULL;
	int num_references;
	aom_img_fmt_t ref_fmt = 0;
	aom_image_t reference_images[MAX_EXTERNAL_REFERENCES];
	aom_image_t output;
	aom_image_t *output_shifted = NULL;
	size_t frame_size = 0;
	const unsigned char *frame = NULL;
	int i, j;
	const char *tile_list_file = NULL;
	int output_format = YUV1D;
	exec_name = argv[0];

	if (argc < 5) die("Invalid number of arguments.");

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

	if (!(outfile = fopen(argv[2], "wb")))
	die("Failed to open %s for writing.", argv[2]);

	num_references = (int)strtol(argv[3], NULL, 0);
	tile_list_file = argv[4];

	if (argc > 5) output_format = (int)strtol(argv[5], NULL, 0);
	if (output_format < YUV1D \|\| output_format > NV12)
	die("Output format out of range [0, 2]");

	info = aom_video_reader_get_info(reader);

	aom_codec_iface_t *decoder;
	if (info->codec_fourcc == LST_FOURCC)
	decoder = get_aom_decoder_by_fourcc(AV1_FOURCC);
	else
	die("Unknown input codec.");
	printf("Using %s\n", aom_codec_iface_name(decoder));

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

	if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_SET_IS_ANNEXB,
	info->is_annexb)) {
	die("Failed to set annex b status");
	}

	// Decode anchor frames.
	AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 0);
	for (i = 0; i < num_references; ++i) {
	aom_video_reader_read_frame(reader);
	frame = aom_video_reader_get_frame(reader, &frame_size);
	if (aom_codec_decode(&codec, frame, frame_size, NULL))
	die_codec(&codec, "Failed to decode frame.");

	if (i == 0) {
	if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_IMG_FORMAT, &ref_fmt))
	die_codec(&codec, "Failed to get the image format");

	int frame_res[2];
	if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_FRAME_SIZE, frame_res))
	die_codec(&codec, "Failed to get the image frame size");

	// Allocate memory to store decoded references. Allocate memory with the
	// border so that it can be used as a reference.
	for (j = 0; j < num_references; j++) {
	unsigned int border = AOM_DEC_BORDER_IN_PIXELS;
	if (!aom_img_alloc_with_border(&reference_images[j], ref_fmt,
	frame_res[0], frame_res[1], 32, 8,
	border)) {
	die("Failed to allocate references.");
	}
	}
	}

	if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_COPY_NEW_FRAME_IMAGE,
	&reference_images[i]))
	die_codec(&codec, "Failed to copy decoded reference frame");

	aom_codec_iter_t iter = NULL;
	aom_image_t *img = NULL;
	while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) {
	char name[1024];
	snprintf(name, sizeof(name), "ref_%d.yuv", i);
	printf("writing ref image to %s, %u, %u\n", name, img->d_w, img->d_h);
	FILE *ref_file = fopen(name, "wb");
	aom_img_write(img, ref_file);
	fclose(ref_file);
	}
	}

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

	printf("Loading compressed frames into memory.\n");

	// Count the frames in the lightfield.
	int num_frames = 0;
	while (aom_video_reader_read_frame(reader)) {
	++num_frames;
	}
	if (num_frames < 1) die("Input light field has no frames.");

	// Read all of the lightfield frames into memory.
	unsigned char **frames =
	(unsigned char *)malloc(num_frames sizeof(unsigned char *));
	size_t frame_sizes = (size_t )malloc(num_frames * sizeof(size_t));
	// Seek to the first camera image.
	fseeko(infile, camera_frame_pos, SEEK_SET);
	for (int f = 0; f < num_frames; ++f) {
	aom_video_reader_read_frame(reader);
	frame = aom_video_reader_get_frame(reader, &frame_size);
	frames[f] = (unsigned char )malloc(frame_size sizeof(unsigned char));
	memcpy(frames[f], frame, frame_size);
	frame_sizes[f] = frame_size;
	}
	printf("Read %d frames.\n", num_frames);

	if (output_format != YUV1D) {
	// Allocate the output frame.
	aom_img_fmt_t out_fmt = ref_fmt;
	if (FORCE_HIGHBITDEPTH_DECODING) out_fmt \|= AOM_IMG_FMT_HIGHBITDEPTH;
	if (!aom_img_alloc(&output, out_fmt, output_frame_width,
	output_frame_height, 32))
	die("Failed to allocate output image.");
	}

	printf("Decoding tile list from file.\n");
	char line[1024];
	FILE *tile_list_fptr = fopen(tile_list_file, "r");
	if (!tile_list_fptr) die_codec(&codec, "Failed to open tile list file.");
	int tile_list_cnt = 0;
	int tile_list_writes = 0;
	int tile_idx = 0;
	aom_image_t *out = NULL;
	unsigned int output_bit_depth = 0;

	while ((fgets(line, 1024, tile_list_fptr)) != NULL) {
	if (line[0] == 'F') {
	if (output_format != YUV1D) {
	// Write out the tile list.
	if (tile_list_cnt) {
	out = &output;
	if (output_bit_depth != 0)
	aom_shift_img(output_bit_depth, &out, &output_shifted);
	img_write_to_file(out, outfile, output_format);
	tile_list_writes++;
	}

	tile_list_cnt++;
	tile_idx = 0;
	// Then memset the frame.
	memset(output.img_data, 0, output.sz);
	}
	continue;
	}

	int image_idx, ref_idx, tc, tr;
	sscanf(line, "%d %d %d %d", &image_idx, &ref_idx, &tc, &tr);
	if (image_idx >= num_frames) {
	die("Tile list image_idx out of bounds: %d >= %d.", image_idx,
	num_frames);
	}
	if (ref_idx >= num_references) {
	die("Tile list ref_idx out of bounds: %d >= %d.", ref_idx,
	num_references);
	}
	frame = frames[image_idx];
	frame_size = frame_sizes[image_idx];

	aom_image_t *img = NULL;
	decode_tile(&codec, frame, frame_size, tr, tc, ref_idx, reference_images,
	&output, &tile_idx, &output_bit_depth, &img, output_format);
	if (output_format == YUV1D) {
	out = img;
	if (output_bit_depth != 0)
	aom_shift_img(output_bit_depth, &out, &output_shifted);
	aom_img_write(out, outfile);
	}
	}

	if (output_format != YUV1D) {
	// Write out the last tile list.
	if (tile_list_writes < tile_list_cnt) {
	out = &output;
	if (output_bit_depth != 0)
	aom_shift_img(output_bit_depth, &out, &output_shifted);
	img_write_to_file(out, outfile, output_format);
	}
	}

	if (output_shifted) aom_img_free(output_shifted);
	if (output_format != YUV1D) aom_img_free(&output);
	for (i = 0; i < num_references; i++) aom_img_free(&reference_images[i]);
	for (int f = 0; f < num_frames; ++f) {
	free(frames[f]);
	}
	free(frame_sizes);
	free(frames);
	if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
	aom_video_reader_close(reader);
	fclose(outfile);

	return EXIT_SUCCESS;
	}