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| -rw-r--r-- | third_party/aom/examples/lightfield_bitstream_parsing.c | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/third_party/aom/examples/lightfield_bitstream_parsing.c b/third_party/aom/examples/lightfield_bitstream_parsing.c new file mode 100644 index 0000000000..05272bafa3 --- /dev/null +++ b/third_party/aom/examples/lightfield_bitstream_parsing.c @@ -0,0 +1,415 @@ +/* + * 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 a text +// file containing a stream of tiles to decode and then 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 +// tile_list.txt +// +// 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/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" + +#define MAX_TILES 512 + +static const char *exec_name; + +void usage_exit(void) { + fprintf(stderr, "Usage: %s <infile> <outfile> <num_references> <tile_list>\n", + exec_name); + exit(EXIT_FAILURE); +} + +#define ALIGN_POWER_OF_TWO(value, n) \ + (((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1)) + +const int output_frame_width = 512; +const int output_frame_height = 512; + +// 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; + +static int get_image_bps(aom_img_fmt_t fmt) { + switch (fmt) { + case AOM_IMG_FMT_I420: return 12; + case AOM_IMG_FMT_I422: return 16; + case AOM_IMG_FMT_I444: return 24; + case AOM_IMG_FMT_I42016: return 24; + case AOM_IMG_FMT_I42216: return 32; + case AOM_IMG_FMT_I44416: return 48; + default: die("Invalid image format"); + } +} + +static void process_tile_list(const TILE_LIST_INFO *tiles, int num_tiles, + aom_codec_pts_t tl_pts, unsigned char **frames, + const size_t *frame_sizes, aom_codec_ctx_t *codec, + unsigned char *tl_buf, AvxVideoWriter *writer, + uint8_t output_frame_width_in_tiles_minus_1, + uint8_t output_frame_height_in_tiles_minus_1) { + 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; + int num_tiles_minus_1 = num_tiles - 1; + int i; + + // 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_unsigned_literal(&wb, data, bits) requires that bits <= 32. + aom_wb_write_unsigned_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, num_tiles_minus_1, 16); + tl += 4; + tile_list_obu_size += 4; + + // Write each tile's data + for (i = 0; i <= num_tiles_minus_1; i++) { + aom_tile_data tile_data = { 0, NULL, 0 }; + + int image_idx = tiles[i].image_idx; + int ref_idx = tiles[i].reference_idx; + int tc = tiles[i].tile_col; + int tr = tiles[i].tile_row; + + // Reset bit writer to the right location. + wb.bit_buffer = tl; + wb.bit_offset = 0; + + size_t frame_size = frame_sizes[image_idx]; + const unsigned char *frame = frames[image_idx]; + + AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_ROW, tr); + AOM_CODEC_CONTROL_TYPECHECKED(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_TYPECHECKED(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."); +} + +int main(int argc, char **argv) { + AvxVideoReader *reader = NULL; + AvxVideoWriter *writer = NULL; + const AvxVideoInfo *info = NULL; + int num_references; + int i; + aom_codec_pts_t pts; + const char *tile_list_file = NULL; + + 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]); + + num_references = (int)strtol(argv[3], NULL, 0); + info = aom_video_reader_get_info(reader); + + aom_video_reader_set_fourcc(reader, AV1_FOURCC); + + // 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]); + + tile_list_file = argv[4]; + + aom_codec_iface_t *decoder = get_aom_decoder_by_fourcc(info->codec_fourcc); + if (!decoder) 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("Failed to initialize decoder."); + + // Decode anchor frames. + AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 0); + + printf("Reading %d reference images.\n", num_references); + 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_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 1); + AOM_CODEC_CONTROL_TYPECHECKED(&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); + + 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)); + if (!(frames && frame_sizes)) die("Failed to allocate frame data."); + + // 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); + size_t frame_size = 0; + const unsigned char *frame = + aom_video_reader_get_frame(reader, &frame_size); + frames[f] = (unsigned char *)malloc(frame_size * sizeof(unsigned char)); + if (!frames[f]) die("Failed to allocate frame data."); + memcpy(frames[f], frame, frame_size); + frame_sizes[f] = frame_size; + } + printf("Read %d frames.\n", num_frames); + + // Copy first camera frame for getting camera frame header. This is done + // only once. + { + size_t frame_size = frame_sizes[0]; + const unsigned char *frame = frames[0]; + pts = num_references; + 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_TYPECHECKED(&codec, AV1_SET_DECODE_TILE_ROW, 0); + AOM_CODEC_CONTROL_TYPECHECKED(&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_TYPECHECKED(&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."); + free(frame_hdr_buf); + } + + // Read out the image format. + aom_img_fmt_t ref_fmt = 0; + if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_IMG_FORMAT, &ref_fmt)) + die_codec(&codec, "Failed to get the image format"); + const int bps = get_image_bps(ref_fmt); + if (!bps) die_codec(&codec, "Invalid image format."); + // 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; + // Allocate a buffer to store tile list bitstream. + const size_t data_sz = MAX_TILES * ALIGN_POWER_OF_TWO(tile_width, 5) * + ALIGN_POWER_OF_TWO(tile_height, 5) * bps / 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 = num_references; + const uint8_t output_frame_width_in_tiles_minus_1 = + output_frame_width / tile_width - 1; + const uint8_t output_frame_height_in_tiles_minus_1 = + output_frame_height / tile_height - 1; + + printf("Reading 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 num_tiles = 0; + TILE_LIST_INFO tiles[MAX_TILES]; + while ((fgets(line, 1024, tile_list_fptr)) != NULL) { + if (line[0] == 'F' || num_tiles >= MAX_TILES) { + // Flush existing tile list and start another, either because we hit a + // new render frame or because we've hit our max number of tiles per list. + if (num_tiles > 0) { + process_tile_list(tiles, num_tiles, tl_pts, frames, frame_sizes, &codec, + tl_buf, writer, output_frame_width_in_tiles_minus_1, + output_frame_height_in_tiles_minus_1); + ++tl_pts; + } + num_tiles = 0; + } + if (line[0] == 'F') { + continue; + } + if (sscanf(line, "%d %d %d %d", &tiles[num_tiles].image_idx, + &tiles[num_tiles].reference_idx, &tiles[num_tiles].tile_col, + &tiles[num_tiles].tile_row) == 4) { + if (tiles[num_tiles].image_idx >= num_frames) { + die("Tile list image_idx out of bounds: %d >= %d.", + tiles[num_tiles].image_idx, num_frames); + } + if (tiles[num_tiles].reference_idx >= num_references) { + die("Tile list reference_idx out of bounds: %d >= %d.", + tiles[num_tiles].reference_idx, num_references); + } + ++num_tiles; + } + } + if (num_tiles > 0) { + // Flush out the last tile list. + process_tile_list(tiles, num_tiles, tl_pts, frames, frame_sizes, &codec, + tl_buf, writer, output_frame_width_in_tiles_minus_1, + output_frame_height_in_tiles_minus_1); + ++tl_pts; + } + + const int num_tile_lists = (int)(tl_pts - pts); + printf("Finished processing tile lists. Num tile lists: %d.\n", + num_tile_lists); + free(tl_buf); + 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_writer_close(writer); + aom_video_reader_close(reader); + + return EXIT_SUCCESS; +} |