408 lines
14 KiB
C
408 lines
14 KiB
C
/*
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* Copyright (c) 2018, Alliance for Open Media. All rights reserved.
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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// Lightfield Bitstream Parsing
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// ============================
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//
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// This is a lightfield bitstream parsing example. It takes an input file
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// containing the whole compressed lightfield bitstream(ivf file) and a text
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// file containing a stream of tiles to decode and then constructs and outputs
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// a new bitstream that can be decoded by an AV1 decoder. The output bitstream
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// contains reference frames(i.e. anchor frames), camera frame header, and
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// tile list OBUs. num_references is the number of anchor frames coded at the
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// beginning of the light field file. After running the lightfield encoder,
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// run lightfield bitstream parsing:
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// examples/lightfield_bitstream_parsing vase10x10.ivf vase_tile_list.ivf 4
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// tile_list.txt
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//
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// The tile_list.txt is expected to be of the form:
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// Frame <frame_index0>
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// <image_index0> <anchor_index0> <tile_col0> <tile_row0>
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// <image_index1> <anchor_index1> <tile_col1> <tile_row1>
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// ...
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// Frame <frame_index1)
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// ...
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//
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// The "Frame" markers indicate a new render frame and thus a new tile list
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// will be started and the old one flushed. The image_indexN, anchor_indexN,
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// tile_colN, and tile_rowN identify an individual tile to be decoded and
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// to use anchor_indexN anchor image for MCP.
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "aom/aom_codec.h"
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#include "aom/aom_decoder.h"
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#include "aom/aom_encoder.h"
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#include "aom/aom_integer.h"
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#include "aom/aomdx.h"
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#include "common/tools_common.h"
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#include "common/video_reader.h"
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#include "common/video_writer.h"
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#define MAX_TILES 512
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static const char *exec_name;
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void usage_exit(void) {
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fprintf(stderr, "Usage: %s <infile> <outfile> <num_references> <tile_list>\n",
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exec_name);
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exit(EXIT_FAILURE);
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}
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#define ALIGN_POWER_OF_TWO(value, n) \
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(((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1))
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const int output_frame_width = 512;
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const int output_frame_height = 512;
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// Spec:
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// typedef struct {
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// uint8_t anchor_frame_idx;
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// uint8_t tile_row;
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// uint8_t tile_col;
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// uint16_t coded_tile_data_size_minus_1;
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// uint8_t *coded_tile_data;
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// } TILE_LIST_ENTRY;
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// Tile list entry provided by the application
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typedef struct {
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int image_idx;
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int reference_idx;
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int tile_col;
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int tile_row;
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} TILE_LIST_INFO;
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static int get_image_bps(aom_img_fmt_t fmt) {
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switch (fmt) {
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case AOM_IMG_FMT_I420: return 12;
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case AOM_IMG_FMT_I422: return 16;
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case AOM_IMG_FMT_I444: return 24;
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case AOM_IMG_FMT_I42016: return 24;
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case AOM_IMG_FMT_I42216: return 32;
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case AOM_IMG_FMT_I44416: return 48;
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default: die("Invalid image format");
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}
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}
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static void process_tile_list(const TILE_LIST_INFO *tiles, int num_tiles,
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aom_codec_pts_t tl_pts, unsigned char **frames,
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const size_t *frame_sizes, aom_codec_ctx_t *codec,
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unsigned char *tl_buf, AvxVideoWriter *writer,
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uint8_t output_frame_width_in_tiles_minus_1,
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uint8_t output_frame_height_in_tiles_minus_1) {
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unsigned char *tl = tl_buf;
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unsigned char *saved_obu_size_loc = NULL;
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uint32_t tile_list_obu_header_size = 0;
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uint32_t tile_list_obu_size = 0;
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int num_tiles_minus_1 = num_tiles - 1;
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int i;
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// Write the tile list OBU header that is 1 byte long.
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int obu_type = OBU_TILE_LIST;
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int obu_has_size_field = 1;
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*tl++ = (obu_type << 3) | (obu_has_size_field << 1);
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tile_list_obu_header_size++;
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// Write the OBU size using a fixed length_field_size of 4 bytes.
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saved_obu_size_loc = tl;
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for (i = 0; i < 4; i++) {
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*tl++ = 0;
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}
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tile_list_obu_header_size += 4;
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// write_tile_list_obu()
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*tl++ = output_frame_width_in_tiles_minus_1;
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*tl++ = output_frame_height_in_tiles_minus_1;
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*tl++ = (num_tiles_minus_1 >> 8) & 0xff;
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*tl++ = num_tiles_minus_1 & 0xff;
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tile_list_obu_size += 4;
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// Write each tile's data
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for (i = 0; i <= num_tiles_minus_1; i++) {
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aom_tile_data tile_data = { 0, NULL, 0 };
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int image_idx = tiles[i].image_idx;
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int ref_idx = tiles[i].reference_idx;
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int tc = tiles[i].tile_col;
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int tr = tiles[i].tile_row;
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size_t frame_size = frame_sizes[image_idx];
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const unsigned char *frame = frames[image_idx];
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AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_ROW, tr);
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AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_COL, tc);
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aom_codec_err_t aom_status =
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aom_codec_decode(codec, frame, frame_size, NULL);
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if (aom_status) die_codec(codec, "Failed to decode tile.");
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AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_GET_TILE_DATA, &tile_data);
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// Copy over tile info.
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// uint8_t anchor_frame_idx;
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// uint8_t tile_row;
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// uint8_t tile_col;
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// uint16_t coded_tile_data_size_minus_1;
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// uint8_t *coded_tile_data;
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uint32_t tile_info_bytes = 5;
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*tl++ = ref_idx;
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*tl++ = tr;
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*tl++ = tc;
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int coded_tile_data_size_minus_1 = (int)tile_data.coded_tile_data_size - 1;
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*tl++ = (coded_tile_data_size_minus_1 >> 8) & 0xff;
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*tl++ = coded_tile_data_size_minus_1 & 0xff;
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memcpy(tl, (uint8_t *)tile_data.coded_tile_data,
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tile_data.coded_tile_data_size);
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tl += tile_data.coded_tile_data_size;
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tile_list_obu_size +=
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tile_info_bytes + (uint32_t)tile_data.coded_tile_data_size;
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}
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// Write tile list OBU size.
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size_t bytes_written = 0;
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if (aom_uleb_encode_fixed_size(tile_list_obu_size, 4, 4, saved_obu_size_loc,
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&bytes_written))
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die_codec(codec, "Failed to encode the tile list obu size.");
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// Copy the tile list.
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if (!aom_video_writer_write_frame(
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writer, tl_buf, tile_list_obu_header_size + tile_list_obu_size,
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tl_pts))
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die_codec(codec, "Failed to copy compressed tile list.");
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}
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int main(int argc, char **argv) {
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AvxVideoReader *reader = NULL;
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AvxVideoWriter *writer = NULL;
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const AvxVideoInfo *info = NULL;
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int num_references;
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int i;
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aom_codec_pts_t pts;
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const char *tile_list_file = NULL;
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exec_name = argv[0];
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if (argc != 5) die("Invalid number of arguments.");
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reader = aom_video_reader_open(argv[1]);
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if (!reader) die("Failed to open %s for reading.", argv[1]);
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num_references = (int)strtol(argv[3], NULL, 0);
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info = aom_video_reader_get_info(reader);
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aom_video_reader_set_fourcc(reader, AV1_FOURCC);
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// The writer to write out ivf file in tile list OBU, which can be decoded by
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// AV1 decoder.
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writer = aom_video_writer_open(argv[2], kContainerIVF, info);
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if (!writer) die("Failed to open %s for writing", argv[2]);
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tile_list_file = argv[4];
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aom_codec_iface_t *decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
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if (!decoder) die("Unknown input codec.");
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printf("Using %s\n", aom_codec_iface_name(decoder));
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aom_codec_ctx_t codec;
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if (aom_codec_dec_init(&codec, decoder, NULL, 0))
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die("Failed to initialize decoder.");
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// Decode anchor frames.
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AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 0);
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printf("Reading %d reference images.\n", num_references);
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for (i = 0; i < num_references; ++i) {
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aom_video_reader_read_frame(reader);
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size_t frame_size = 0;
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const unsigned char *frame =
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aom_video_reader_get_frame(reader, &frame_size);
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pts = (aom_codec_pts_t)aom_video_reader_get_frame_pts(reader);
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// Copy references bitstream directly.
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if (!aom_video_writer_write_frame(writer, frame, frame_size, pts))
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die_codec(&codec, "Failed to copy compressed anchor frame.");
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if (aom_codec_decode(&codec, frame, frame_size, NULL))
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die_codec(&codec, "Failed to decode frame.");
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}
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// Decode camera frames.
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AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 1);
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AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_EXT_TILE_DEBUG, 1);
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FILE *infile = aom_video_reader_get_file(reader);
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// Record the offset of the first camera image.
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const FileOffset camera_frame_pos = ftello(infile);
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printf("Loading compressed frames into memory.\n");
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// Count the frames in the lightfield.
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int num_frames = 0;
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while (aom_video_reader_read_frame(reader)) {
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++num_frames;
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}
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if (num_frames < 1) die("Input light field has no frames.");
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// Read all of the lightfield frames into memory.
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unsigned char **frames =
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(unsigned char **)malloc(num_frames * sizeof(unsigned char *));
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size_t *frame_sizes = (size_t *)malloc(num_frames * sizeof(size_t));
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if (!(frames && frame_sizes)) die("Failed to allocate frame data.");
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// Seek to the first camera image.
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fseeko(infile, camera_frame_pos, SEEK_SET);
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for (int f = 0; f < num_frames; ++f) {
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aom_video_reader_read_frame(reader);
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size_t frame_size = 0;
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const unsigned char *frame =
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aom_video_reader_get_frame(reader, &frame_size);
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frames[f] = (unsigned char *)malloc(frame_size * sizeof(unsigned char));
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if (!frames[f]) die("Failed to allocate frame data.");
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memcpy(frames[f], frame, frame_size);
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frame_sizes[f] = frame_size;
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}
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printf("Read %d frames.\n", num_frames);
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// Copy first camera frame for getting camera frame header. This is done
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// only once.
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{
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size_t frame_size = frame_sizes[0];
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const unsigned char *frame = frames[0];
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pts = num_references;
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aom_tile_data frame_header_info = { 0, NULL, 0 };
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// Need to decode frame header to get camera frame header info. So, here
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// decoding 1 tile is enough.
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AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_DECODE_TILE_ROW, 0);
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AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_DECODE_TILE_COL, 0);
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aom_codec_err_t aom_status =
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aom_codec_decode(&codec, frame, frame_size, NULL);
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if (aom_status) die_codec(&codec, "Failed to decode tile.");
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AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_FRAME_HEADER_INFO,
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&frame_header_info);
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size_t obu_size_offset =
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(uint8_t *)frame_header_info.coded_tile_data - frame;
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size_t length_field_size = frame_header_info.coded_tile_data_size;
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// Remove ext-tile tile info.
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uint32_t frame_header_size = (uint32_t)frame_header_info.extra_size - 1;
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size_t bytes_to_copy =
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obu_size_offset + length_field_size + frame_header_size;
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unsigned char *frame_hdr_buf = (unsigned char *)malloc(bytes_to_copy);
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if (frame_hdr_buf == NULL)
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die_codec(&codec, "Failed to allocate frame header buffer.");
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memcpy(frame_hdr_buf, frame, bytes_to_copy);
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// Update frame header OBU size.
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size_t bytes_written = 0;
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if (aom_uleb_encode_fixed_size(
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frame_header_size, length_field_size, length_field_size,
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frame_hdr_buf + obu_size_offset, &bytes_written))
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die_codec(&codec, "Failed to encode the tile list obu size.");
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// Copy camera frame header bitstream.
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if (!aom_video_writer_write_frame(writer, frame_hdr_buf, bytes_to_copy,
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pts))
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die_codec(&codec, "Failed to copy compressed camera frame header.");
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free(frame_hdr_buf);
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}
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// Read out the image format.
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aom_img_fmt_t ref_fmt = 0;
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if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_IMG_FORMAT, &ref_fmt))
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die_codec(&codec, "Failed to get the image format");
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const int bps = get_image_bps(ref_fmt);
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if (!bps) die_codec(&codec, "Invalid image format.");
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// read out the tile size.
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unsigned int tile_size = 0;
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if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_TILE_SIZE, &tile_size))
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die_codec(&codec, "Failed to get the tile size");
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const unsigned int tile_width = tile_size >> 16;
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const unsigned int tile_height = tile_size & 65535;
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// Allocate a buffer to store tile list bitstream.
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const size_t data_sz = MAX_TILES * ALIGN_POWER_OF_TWO(tile_width, 5) *
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ALIGN_POWER_OF_TWO(tile_height, 5) * bps / 8;
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unsigned char *tl_buf = (unsigned char *)malloc(data_sz);
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if (tl_buf == NULL) die_codec(&codec, "Failed to allocate tile list buffer.");
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aom_codec_pts_t tl_pts = num_references;
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const uint8_t output_frame_width_in_tiles_minus_1 =
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output_frame_width / tile_width - 1;
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const uint8_t output_frame_height_in_tiles_minus_1 =
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output_frame_height / tile_height - 1;
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printf("Reading tile list from file.\n");
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char line[1024];
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FILE *tile_list_fptr = fopen(tile_list_file, "r");
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if (!tile_list_fptr) die_codec(&codec, "Failed to open tile list file.");
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int num_tiles = 0;
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TILE_LIST_INFO tiles[MAX_TILES];
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while ((fgets(line, 1024, tile_list_fptr)) != NULL) {
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if (line[0] == 'F' || num_tiles >= MAX_TILES) {
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// Flush existing tile list and start another, either because we hit a
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// new render frame or because we've hit our max number of tiles per list.
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if (num_tiles > 0) {
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process_tile_list(tiles, num_tiles, tl_pts, frames, frame_sizes, &codec,
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tl_buf, writer, output_frame_width_in_tiles_minus_1,
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output_frame_height_in_tiles_minus_1);
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++tl_pts;
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}
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num_tiles = 0;
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}
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if (line[0] == 'F') {
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continue;
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}
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if (sscanf(line, "%d %d %d %d", &tiles[num_tiles].image_idx,
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&tiles[num_tiles].reference_idx, &tiles[num_tiles].tile_col,
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&tiles[num_tiles].tile_row) == 4) {
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if (tiles[num_tiles].image_idx >= num_frames) {
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die("Tile list image_idx out of bounds: %d >= %d.",
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tiles[num_tiles].image_idx, num_frames);
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}
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if (tiles[num_tiles].reference_idx >= num_references) {
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die("Tile list reference_idx out of bounds: %d >= %d.",
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tiles[num_tiles].reference_idx, num_references);
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}
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++num_tiles;
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}
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}
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if (num_tiles > 0) {
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// Flush out the last tile list.
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process_tile_list(tiles, num_tiles, tl_pts, frames, frame_sizes, &codec,
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tl_buf, writer, output_frame_width_in_tiles_minus_1,
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output_frame_height_in_tiles_minus_1);
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++tl_pts;
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}
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const int num_tile_lists = (int)(tl_pts - pts);
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printf("Finished processing tile lists. Num tile lists: %d.\n",
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num_tile_lists);
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free(tl_buf);
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for (int f = 0; f < num_frames; ++f) {
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free(frames[f]);
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}
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free(frame_sizes);
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free(frames);
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if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
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aom_video_writer_close(writer);
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aom_video_reader_close(reader);
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return EXIT_SUCCESS;
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}
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