diff options
Diffstat (limited to 'media/libaom/src/examples/lightfield_bitstream_parsing.c')
| -rw-r--r-- | media/libaom/src/examples/lightfield_bitstream_parsing.c | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/media/libaom/src/examples/lightfield_bitstream_parsing.c b/media/libaom/src/examples/lightfield_bitstream_parsing.c new file mode 100644 index 000000000..159f1617a --- /dev/null +++ b/media/libaom/src/examples/lightfield_bitstream_parsing.c @@ -0,0 +1,348 @@ +/* + * 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" + +#define MAX_TILES 512 + +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 } }, +}; + +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"); + } + return 0; +} + +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 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); + + // 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."); + free(frame_hdr_buf); + } + + // Read out the image format. + aom_img_fmt_t ref_fmt = 0; + if (aom_codec_control(&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(&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 = 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_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, 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; +} |