AOMedia AV1 Codec: lightfield_bitstream_parsing

| AOMedia AV1 Codec

lightfield_bitstream_parsing
1/*
2 * Copyright (c) 2018, Alliance for Open Media. All rights reserved.
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12// Lightfield Bitstream Parsing
13// ============================
14//
15// This is a lightfield bitstream parsing example. It takes an input file
16// containing the whole compressed lightfield bitstream(ivf file) and a text
17// file containing a stream of tiles to decode and then constructs and outputs
18// a new bitstream that can be decoded by an AV1 decoder. The output bitstream
19// contains reference frames(i.e. anchor frames), camera frame header, and
20// tile list OBUs. num_references is the number of anchor frames coded at the
21// beginning of the light field file. After running the lightfield encoder,
22// run lightfield bitstream parsing:
23// examples/lightfield_bitstream_parsing vase10x10.ivf vase_tile_list.ivf 4
24// tile_list.txt
25//
26// The tile_list.txt is expected to be of the form:
27// Frame <frame_index0>
28// <image_index0> <anchor_index0> <tile_col0> <tile_row0>
29// <image_index1> <anchor_index1> <tile_col1> <tile_row1>
30// ...
31// Frame <frame_index1)
32// ...
33//
34// The "Frame" markers indicate a new render frame and thus a new tile list
35// will be started and the old one flushed. The image_indexN, anchor_indexN,
36// tile_colN, and tile_rowN identify an individual tile to be decoded and
37// to use anchor_indexN anchor image for MCP.
38
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42
43#include "aom/aom_codec.h"
44#include "aom/aom_decoder.h"
45#include "aom/aom_encoder.h"
46#include "aom/aom_integer.h"
47#include "aom/aomdx.h"
48#include "common/tools_common.h"
49#include "common/video_reader.h"
50#include "common/video_writer.h"
51
52#define MAX_TILES 512
53
54static const char *exec_name;
55
56void usage_exit(void) {
57 fprintf(stderr, "Usage: %s <infile> <outfile> <num_references> <tile_list>\n",
58 exec_name);
59 exit(EXIT_FAILURE);
60}
61
62#define ALIGN_POWER_OF_TWO(value, n) \
63 (((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1))
64
65const int output_frame_width = 512;
66const int output_frame_height = 512;
67
68// Spec:
69// typedef struct {
70// uint8_t anchor_frame_idx;
71// uint8_t tile_row;
72// uint8_t tile_col;
73// uint16_t coded_tile_data_size_minus_1;
74// uint8_t *coded_tile_data;
75// } TILE_LIST_ENTRY;
76
77// Tile list entry provided by the application
78typedef struct {
79 int image_idx;
80 int reference_idx;
81 int tile_col;
82 int tile_row;
83} TILE_LIST_INFO;
84
85static int get_image_bps(aom_img_fmt_t fmt) {
86 switch (fmt) {
87 case AOM_IMG_FMT_I420: return 12;
88 case AOM_IMG_FMT_I422: return 16;
89 case AOM_IMG_FMT_I444: return 24;
90 case AOM_IMG_FMT_I42016: return 24;
91 case AOM_IMG_FMT_I42216: return 32;
92 case AOM_IMG_FMT_I44416: return 48;
93 default: die("Invalid image format");
94 }
95}
96
97static void process_tile_list(const TILE_LIST_INFO *tiles, int num_tiles,
98 aom_codec_pts_t tl_pts, unsigned char **frames,
99 const size_t *frame_sizes, aom_codec_ctx_t *codec,
100 unsigned char *tl_buf, AvxVideoWriter *writer,
101 uint8_t output_frame_width_in_tiles_minus_1,
102 uint8_t output_frame_height_in_tiles_minus_1) {
103 unsigned char *tl = tl_buf;
104 unsigned char *saved_obu_size_loc = NULL;
105 uint32_t tile_list_obu_header_size = 0;
106 uint32_t tile_list_obu_size = 0;
107 int num_tiles_minus_1 = num_tiles - 1;
108 int i;
109
110 // Write the tile list OBU header that is 1 byte long.
111 int obu_type = OBU_TILE_LIST;
112 int obu_has_size_field = 1;
113 *tl++ = (obu_type << 3) | (obu_has_size_field << 1);
114 tile_list_obu_header_size++;
115
116 // Write the OBU size using a fixed length_field_size of 4 bytes.
117 saved_obu_size_loc = tl;
118 for (i = 0; i < 4; i++) {
119 *tl++ = 0;
120 }
121 tile_list_obu_header_size += 4;
122
123 // write_tile_list_obu()
124 *tl++ = output_frame_width_in_tiles_minus_1;
125 *tl++ = output_frame_height_in_tiles_minus_1;
126 *tl++ = (num_tiles_minus_1 >> 8) & 0xff;
127 *tl++ = num_tiles_minus_1 & 0xff;
128 tile_list_obu_size += 4;
129
130 // Write each tile's data
131 for (i = 0; i <= num_tiles_minus_1; i++) {
132 aom_tile_data tile_data = { 0, NULL, 0 };
133
134 int image_idx = tiles[i].image_idx;
135 int ref_idx = tiles[i].reference_idx;
136 int tc = tiles[i].tile_col;
137 int tr = tiles[i].tile_row;
138
139 size_t frame_size = frame_sizes[image_idx];
140 const unsigned char *frame = frames[image_idx];
141
142 AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_ROW, tr);
143 AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_COL, tc);
144
145 aom_codec_err_t aom_status =
146 aom_codec_decode(codec, frame, frame_size, NULL);
147 if (aom_status) die_codec(codec, "Failed to decode tile.");
148
149 AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_GET_TILE_DATA, &tile_data);
150
151 // Copy over tile info.
152 // uint8_t anchor_frame_idx;
153 // uint8_t tile_row;
154 // uint8_t tile_col;
155 // uint16_t coded_tile_data_size_minus_1;
156 // uint8_t *coded_tile_data;
157 uint32_t tile_info_bytes = 5;
158 *tl++ = ref_idx;
159 *tl++ = tr;
160 *tl++ = tc;
161 int coded_tile_data_size_minus_1 = (int)tile_data.coded_tile_data_size - 1;
162 *tl++ = (coded_tile_data_size_minus_1 >> 8) & 0xff;
163 *tl++ = coded_tile_data_size_minus_1 & 0xff;
164
165 memcpy(tl, (uint8_t *)tile_data.coded_tile_data,
166 tile_data.coded_tile_data_size);
167 tl += tile_data.coded_tile_data_size;
168
169 tile_list_obu_size +=
170 tile_info_bytes + (uint32_t)tile_data.coded_tile_data_size;
171 }
172
173 // Write tile list OBU size.
174 size_t bytes_written = 0;
175 if (aom_uleb_encode_fixed_size(tile_list_obu_size, 4, 4, saved_obu_size_loc,
176 &bytes_written))
177 die_codec(codec, "Failed to encode the tile list obu size.");
178
179 // Copy the tile list.
180 if (!aom_video_writer_write_frame(
181 writer, tl_buf, tile_list_obu_header_size + tile_list_obu_size,
182 tl_pts))
183 die_codec(codec, "Failed to copy compressed tile list.");
184}
185
186int main(int argc, char **argv) {
187 AvxVideoReader *reader = NULL;
188 AvxVideoWriter *writer = NULL;
189 const AvxVideoInfo *info = NULL;
190 int num_references;
191 int i;
192 aom_codec_pts_t pts;
193 const char *tile_list_file = NULL;
194
195 exec_name = argv[0];
196 if (argc != 5) die("Invalid number of arguments.");
197
198 reader = aom_video_reader_open(argv[1]);
199 if (!reader) die("Failed to open %s for reading.", argv[1]);
200
201 num_references = (int)strtol(argv[3], NULL, 0);
202 info = aom_video_reader_get_info(reader);
203
204 aom_video_reader_set_fourcc(reader, AV1_FOURCC);
205
206 // The writer to write out ivf file in tile list OBU, which can be decoded by
207 // AV1 decoder.
208 writer = aom_video_writer_open(argv[2], kContainerIVF, info);
209 if (!writer) die("Failed to open %s for writing", argv[2]);
210
211 tile_list_file = argv[4];
212
213 aom_codec_iface_t *decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
214 if (!decoder) die("Unknown input codec.");
215 printf("Using %s\n", aom_codec_iface_name(decoder));
216
217 aom_codec_ctx_t codec;
218 if (aom_codec_dec_init(&codec, decoder, NULL, 0))
219 die("Failed to initialize decoder.");
220
221 // Decode anchor frames.
222 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 0);
223
224 printf("Reading %d reference images.\n", num_references);
225 for (i = 0; i < num_references; ++i) {
226 aom_video_reader_read_frame(reader);
227
228 size_t frame_size = 0;
229 const unsigned char *frame =
230 aom_video_reader_get_frame(reader, &frame_size);
231 pts = (aom_codec_pts_t)aom_video_reader_get_frame_pts(reader);
232
233 // Copy references bitstream directly.
234 if (!aom_video_writer_write_frame(writer, frame, frame_size, pts))
235 die_codec(&codec, "Failed to copy compressed anchor frame.");
236
237 if (aom_codec_decode(&codec, frame, frame_size, NULL))
238 die_codec(&codec, "Failed to decode frame.");
239 }
240
241 // Decode camera frames.
242 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 1);
243 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_EXT_TILE_DEBUG, 1);
244
245 FILE *infile = aom_video_reader_get_file(reader);
246 // Record the offset of the first camera image.
247 const FileOffset camera_frame_pos = ftello(infile);
248
249 printf("Loading compressed frames into memory.\n");
250
251 // Count the frames in the lightfield.
252 int num_frames = 0;
253 while (aom_video_reader_read_frame(reader)) {
254 ++num_frames;
255 }
256 if (num_frames < 1) die("Input light field has no frames.");
257
258 // Read all of the lightfield frames into memory.
259 unsigned char **frames =
260 (unsigned char **)malloc(num_frames * sizeof(unsigned char *));
261 size_t *frame_sizes = (size_t *)malloc(num_frames * sizeof(size_t));
262 if (!(frames && frame_sizes)) die("Failed to allocate frame data.");
263
264 // Seek to the first camera image.
265 fseeko(infile, camera_frame_pos, SEEK_SET);
266 for (int f = 0; f < num_frames; ++f) {
267 aom_video_reader_read_frame(reader);
268 size_t frame_size = 0;
269 const unsigned char *frame =
270 aom_video_reader_get_frame(reader, &frame_size);
271 frames[f] = (unsigned char *)malloc(frame_size * sizeof(unsigned char));
272 if (!frames[f]) die("Failed to allocate frame data.");
273 memcpy(frames[f], frame, frame_size);
274 frame_sizes[f] = frame_size;
275 }
276 printf("Read %d frames.\n", num_frames);
277
278 // Copy first camera frame for getting camera frame header. This is done
279 // only once.
280 {
281 size_t frame_size = frame_sizes[0];
282 const unsigned char *frame = frames[0];
283 pts = num_references;
284 aom_tile_data frame_header_info = { 0, NULL, 0 };
285
286 // Need to decode frame header to get camera frame header info. So, here
287 // decoding 1 tile is enough.
288 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_DECODE_TILE_ROW, 0);
289 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_DECODE_TILE_COL, 0);
290
291 aom_codec_err_t aom_status =
292 aom_codec_decode(&codec, frame, frame_size, NULL);
293 if (aom_status) die_codec(&codec, "Failed to decode tile.");
294
295 AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_FRAME_HEADER_INFO,
296 &frame_header_info);
297
298 size_t obu_size_offset =
299 (uint8_t *)frame_header_info.coded_tile_data - frame;
300 size_t length_field_size = frame_header_info.coded_tile_data_size;
301 // Remove ext-tile tile info.
302 uint32_t frame_header_size = (uint32_t)frame_header_info.extra_size - 1;
303 size_t bytes_to_copy =
304 obu_size_offset + length_field_size + frame_header_size;
305
306 unsigned char *frame_hdr_buf = (unsigned char *)malloc(bytes_to_copy);
307 if (frame_hdr_buf == NULL)
308 die_codec(&codec, "Failed to allocate frame header buffer.");
309
310 memcpy(frame_hdr_buf, frame, bytes_to_copy);
311
312 // Update frame header OBU size.
313 size_t bytes_written = 0;
314 if (aom_uleb_encode_fixed_size(
315 frame_header_size, length_field_size, length_field_size,
316 frame_hdr_buf + obu_size_offset, &bytes_written))
317 die_codec(&codec, "Failed to encode the tile list obu size.");
318
319 // Copy camera frame header bitstream.
320 if (!aom_video_writer_write_frame(writer, frame_hdr_buf, bytes_to_copy,
321 pts))
322 die_codec(&codec, "Failed to copy compressed camera frame header.");
323 free(frame_hdr_buf);
324 }
325
326 // Read out the image format.
327 aom_img_fmt_t ref_fmt = 0;
328 if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_IMG_FORMAT, &ref_fmt))
329 die_codec(&codec, "Failed to get the image format");
330 const int bps = get_image_bps(ref_fmt);
331 if (!bps) die_codec(&codec, "Invalid image format.");
332 // read out the tile size.
333 unsigned int tile_size = 0;
334 if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_TILE_SIZE, &tile_size))
335 die_codec(&codec, "Failed to get the tile size");
336 const unsigned int tile_width = tile_size >> 16;
337 const unsigned int tile_height = tile_size & 65535;
338 // Allocate a buffer to store tile list bitstream.
339 const size_t data_sz = MAX_TILES * ALIGN_POWER_OF_TWO(tile_width, 5) *
340 ALIGN_POWER_OF_TWO(tile_height, 5) * bps / 8;
341
342 unsigned char *tl_buf = (unsigned char *)malloc(data_sz);
343 if (tl_buf == NULL) die_codec(&codec, "Failed to allocate tile list buffer.");
344
345 aom_codec_pts_t tl_pts = num_references;
346 const uint8_t output_frame_width_in_tiles_minus_1 =
347 output_frame_width / tile_width - 1;
348 const uint8_t output_frame_height_in_tiles_minus_1 =
349 output_frame_height / tile_height - 1;
350
351 printf("Reading tile list from file.\n");
352 char line[1024];
353 FILE *tile_list_fptr = fopen(tile_list_file, "r");
354 if (!tile_list_fptr) die_codec(&codec, "Failed to open tile list file.");
355 int num_tiles = 0;
356 TILE_LIST_INFO tiles[MAX_TILES];
357 while ((fgets(line, 1024, tile_list_fptr)) != NULL) {
358 if (line[0] == 'F' || num_tiles >= MAX_TILES) {
359 // Flush existing tile list and start another, either because we hit a
360 // new render frame or because we've hit our max number of tiles per list.
361 if (num_tiles > 0) {
362 process_tile_list(tiles, num_tiles, tl_pts, frames, frame_sizes, &codec,
363 tl_buf, writer, output_frame_width_in_tiles_minus_1,
364 output_frame_height_in_tiles_minus_1);
365 ++tl_pts;
366 }
367 num_tiles = 0;
368 }
369 if (line[0] == 'F') {
370 continue;
371 }
372 if (sscanf(line, "%d %d %d %d", &tiles[num_tiles].image_idx,
373 &tiles[num_tiles].reference_idx, &tiles[num_tiles].tile_col,
374 &tiles[num_tiles].tile_row) == 4) {
375 if (tiles[num_tiles].image_idx >= num_frames) {
376 die("Tile list image_idx out of bounds: %d >= %d.",
377 tiles[num_tiles].image_idx, num_frames);
378 }
379 if (tiles[num_tiles].reference_idx >= num_references) {
380 die("Tile list reference_idx out of bounds: %d >= %d.",
381 tiles[num_tiles].reference_idx, num_references);
382 }
383 ++num_tiles;
384 }
385 }
386 if (num_tiles > 0) {
387 // Flush out the last tile list.
388 process_tile_list(tiles, num_tiles, tl_pts, frames, frame_sizes, &codec,
389 tl_buf, writer, output_frame_width_in_tiles_minus_1,
390 output_frame_height_in_tiles_minus_1);
391 ++tl_pts;
392 }
393
394 const int num_tile_lists = (int)(tl_pts - pts);
395 printf("Finished processing tile lists. Num tile lists: %d.\n",
396 num_tile_lists);
397 free(tl_buf);
398 for (int f = 0; f < num_frames; ++f) {
399 free(frames[f]);
400 }
401 free(frame_sizes);
402 free(frames);
403 if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
404 aom_video_writer_close(writer);
405 aom_video_reader_close(reader);
406
407 return EXIT_SUCCESS;
408}
aom_codec.h
Describes the codec algorithm interface to applications.
aom_decoder.h
Describes the decoder algorithm interface to applications.
aom_encoder.h
Describes the encoder algorithm interface to applications.
AOM_IMG_FMT_I42216
@ AOM_IMG_FMT_I42216
Definition aom_image.h:58
AOM_IMG_FMT_I42016
@ AOM_IMG_FMT_I42016
Definition aom_image.h:56
AOM_IMG_FMT_I444
@ AOM_IMG_FMT_I444
Definition aom_image.h:50
AOM_IMG_FMT_I422
@ AOM_IMG_FMT_I422
Definition aom_image.h:49
AOM_IMG_FMT_I44416
@ AOM_IMG_FMT_I44416
Definition aom_image.h:59
AOM_IMG_FMT_I420
@ AOM_IMG_FMT_I420
Definition aom_image.h:45
aom_img_fmt_t
enum aom_img_fmt aom_img_fmt_t
List of supported image formats.
aomdx.h
Provides definitions for using AOM or AV1 within the aom Decoder interface.
AV1_SET_TILE_MODE
@ AV1_SET_TILE_MODE
Codec control function to set the tile coding mode, unsigned int parameter.
Definition aomdx.h:316
AV1D_GET_TILE_SIZE
@ AV1D_GET_TILE_SIZE
Codec control function to get the width and height (in pixels) of the tiles in a tile list,...
Definition aomdx.h:243
AV1_SET_DECODE_TILE_ROW
@ AV1_SET_DECODE_TILE_ROW
Codec control function to set the range of tile decoding, int parameter.
Definition aomdx.h:307
AV1D_GET_IMG_FORMAT
@ AV1D_GET_IMG_FORMAT
Codec control function to get the image format of the stream, aom_img_fmt_t* parameter.
Definition aomdx.h:235
AV1D_GET_TILE_DATA
@ AV1D_GET_TILE_DATA
Codec control function to get the start address and size of a tile in the coded bitstream,...
Definition aomdx.h:326
AV1D_GET_FRAME_HEADER_INFO
@ AV1D_GET_FRAME_HEADER_INFO
Codec control function to get the frame header information of an encoded frame, aom_tile_data* parame...
Definition aomdx.h:321
AV1D_EXT_TILE_DEBUG
@ AV1D_EXT_TILE_DEBUG
Codec control function to enable the ext-tile software debug and testing code in the decoder,...
Definition aomdx.h:339
aom_codec_iface_name
const char * aom_codec_iface_name(aom_codec_iface_t *iface)
Return the name for a given interface.
aom_codec_ctx_t
struct aom_codec_ctx aom_codec_ctx_t
Codec context structure.
aom_codec_iface_t
const struct aom_codec_iface aom_codec_iface_t
Codec interface structure.
Definition aom_codec.h:271
aom_codec_pts_t
int64_t aom_codec_pts_t
Time Stamp Type.
Definition aom_codec.h:252
aom_codec_destroy
aom_codec_err_t aom_codec_destroy(aom_codec_ctx_t *ctx)
Destroy a codec instance.
aom_codec_err_t
aom_codec_err_t
Algorithm return codes.
Definition aom_codec.h:155
AOM_CODEC_CONTROL_TYPECHECKED
#define AOM_CODEC_CONTROL_TYPECHECKED(ctx, id, data)
aom_codec_control wrapper macro (adds type-checking, less flexible)
Definition aom_codec.h:542
aom_codec_decode
aom_codec_err_t aom_codec_decode(aom_codec_ctx_t *ctx, const uint8_t *data, size_t data_sz, void *user_priv)
Decode data.
aom_codec_dec_init
#define aom_codec_dec_init(ctx, iface, cfg, flags)
Convenience macro for aom_codec_dec_init_ver().
Definition aom_decoder.h:129
aom_tile_data
Structure to hold a tile's start address and size in the bitstream.
Definition aomdx.h:91
aom_tile_data::coded_tile_data
const void * coded_tile_data
Definition aomdx.h:95
aom_tile_data::coded_tile_data_size
size_t coded_tile_data_size
Definition aomdx.h:93
aom_tile_data::extra_size
size_t extra_size
Definition aomdx.h:97