AOMedia Codec SDK: lightfield_bitstream_parsing

AOMedia Codec SDK

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 an lightfield bitstream parsing example. It takes an input file
16 // containing the whole compressed lightfield bitstream(ivf file), and parses it
17 // and constructs and outputs a new bitstream that can be decoded by an AV1
18 // decoder. The output bitstream contains tile list OBUs. The lf_width and
19 // lf_height arguments are the number of lightfield images in each dimension.
20 // The lf_blocksize determines the number of reference images used.
21 // After running the lightfield encoder, run lightfield bitstream parsing:
22 // examples/lightfield_bitstream_parsing vase10x10.ivf vase_tile_list.ivf 10 10
23 // 5
24
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28
29 #include "aom/aom_decoder.h"
30 #include "aom/aom_encoder.h"
31 #include "aom/aom_integer.h"
32 #include "aom/aomdx.h"
33 #include "aom_dsp/bitwriter_buffer.h"
34 #include "common/tools_common.h"
35 #include "common/video_reader.h"
36 #include "common/video_writer.h"
37
38 static const char *exec_name;
39
40 void usage_exit(void) {
41 fprintf(
42 stderr,
43 "Usage: %s <infile> <outfile> <lf_width> <lf_height> <lf_blocksize> \n",
44 exec_name);
45 exit(EXIT_FAILURE);
46 }
47
48 #define ALIGN_POWER_OF_TWO(value, n) \
49 (((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1))
50
51 // SB size: 64x64
52 const uint8_t output_frame_width_in_tiles_minus_1 = 512 / 64 - 1;
53 const uint8_t output_frame_height_in_tiles_minus_1 = 512 / 64 - 1;
54
55 // Spec:
56 // typedef struct {
57 // uint8_t anchor_frame_idx;
58 // uint8_t tile_row;
59 // uint8_t tile_col;
60 // uint16_t coded_tile_data_size_minus_1;
61 // uint8_t *coded_tile_data;
62 // } TILE_LIST_ENTRY;
63
64 // Tile list entry provided by the application
65 typedef struct {
66 int image_idx;
67 int reference_idx;
68 int tile_col;
69 int tile_row;
70 } TILE_LIST_INFO;
71
72 // M references: 0 - M-1; N images(including references): 0 - N-1;
73 // Note: order the image index incrementally, so that we only go through the
74 // bitstream once to construct the tile list.
75 const int num_tile_lists = 2;
76 const uint16_t tile_count_minus_1 = 9 - 1;
77 const TILE_LIST_INFO tile_list[2][9] = {
78 { { 16, 0, 4, 5 },
79 { 83, 3, 13, 2 },
80 { 57, 2, 2, 6 },
81 { 31, 1, 11, 5 },
82 { 2, 0, 7, 4 },
83 { 77, 3, 9, 9 },
84 { 49, 1, 0, 1 },
85 { 6, 0, 3, 10 },
86 { 63, 2, 5, 8 } },
87 { { 65, 2, 11, 1 },
88 { 42, 1, 3, 7 },
89 { 88, 3, 8, 4 },
90 { 76, 3, 1, 15 },
91 { 1, 0, 2, 2 },
92 { 19, 0, 5, 6 },
93 { 60, 2, 4, 0 },
94 { 25, 1, 11, 15 },
95 { 50, 2, 5, 4 } },
96 };
97
98 int main(int argc, char **argv) {
99 aom_codec_ctx_t codec;
100 AvxVideoReader *reader = NULL;
101 AvxVideoWriter *writer = NULL;
102 const AvxInterface *decoder = NULL;
103 const AvxVideoInfo *info = NULL;
104 const char *lf_width_arg;
105 const char *lf_height_arg;
106 const char *lf_blocksize_arg;
107 int width, height;
108 int lf_width, lf_height;
109 int lf_blocksize;
110 int u_blocks, v_blocks;
111 int n, i;
112 aom_codec_pts_t pts;
113
114 exec_name = argv[0];
115 if (argc != 6) die("Invalid number of arguments.");
116
117 reader = aom_video_reader_open(argv[1]);
118 if (!reader) die("Failed to open %s for reading.", argv[1]);
119
120 lf_width_arg = argv[3];
121 lf_height_arg = argv[4];
122 lf_blocksize_arg = argv[5];
123
124 lf_width = (int)strtol(lf_width_arg, NULL, 0);
125 lf_height = (int)strtol(lf_height_arg, NULL, 0);
126 lf_blocksize = (int)strtol(lf_blocksize_arg, NULL, 0);
127
128 info = aom_video_reader_get_info(reader);
129 width = info->frame_width;
130 height = info->frame_height;
131
132 // The writer to write out ivf file in tile list OBU, which can be decoded by
133 // AV1 decoder.
134 writer = aom_video_writer_open(argv[2], kContainerIVF, info);
135 if (!writer) die("Failed to open %s for writing", argv[2]);
136
137 decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
138 if (!decoder) die("Unknown input codec.");
139 printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
140
141 if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
142 die_codec(&codec, "Failed to initialize decoder.");
143
144 // Decode anchor frames.
145 aom_codec_control_(&codec, AV1_SET_TILE_MODE, 0);
146
147 // How many anchor frames we have.
148 u_blocks = (lf_width + lf_blocksize - 1) / lf_blocksize;
149 v_blocks = (lf_height + lf_blocksize - 1) / lf_blocksize;
150
151 int num_references = v_blocks * u_blocks;
152 for (i = 0; i < num_references; ++i) {
153 aom_video_reader_read_frame(reader);
154
155 size_t frame_size = 0;
156 const unsigned char *frame =
157 aom_video_reader_get_frame(reader, &frame_size);
158 pts = (aom_codec_pts_t)aom_video_reader_get_frame_pts(reader);
159
160 // Copy references bitstream directly.
161 if (!aom_video_writer_write_frame(writer, frame, frame_size, pts))
162 die_codec(&codec, "Failed to copy compressed anchor frame.");
163
164 if (aom_codec_decode(&codec, frame, frame_size, NULL))
165 die_codec(&codec, "Failed to decode frame.");
166 }
167
168 // Decode camera frames.
169 aom_codec_control_(&codec, AV1_SET_TILE_MODE, 1);
170 aom_codec_control_(&codec, AV1D_EXT_TILE_DEBUG, 1);
171
172 FILE *infile = aom_video_reader_get_file(reader);
173 // Record the offset of the first camera image.
174 const FileOffset camera_frame_pos = ftello(infile);
175
176 // Read out the first camera frame.
177 aom_video_reader_read_frame(reader);
178
179 // Copy first camera frame for getting camera frame header. This is done
180 // only once.
181 {
182 size_t frame_size = 0;
183 const unsigned char *frame =
184 aom_video_reader_get_frame(reader, &frame_size);
185 pts = (aom_codec_pts_t)aom_video_reader_get_frame_pts(reader);
186 aom_tile_data frame_header_info = { 0, NULL, 0 };
187
188 // Need to decode frame header to get camera frame header info. So, here
189 // decoding 1 tile is enough.
190 aom_codec_control_(&codec, AV1_SET_DECODE_TILE_ROW, 0);
191 aom_codec_control_(&codec, AV1_SET_DECODE_TILE_COL, 0);
192
193 aom_codec_err_t aom_status =
194 aom_codec_decode(&codec, frame, frame_size, NULL);
195 if (aom_status) die_codec(&codec, "Failed to decode tile.");
196
197 aom_codec_control_(&codec, AV1D_GET_FRAME_HEADER_INFO, &frame_header_info);
198
199 size_t obu_size_offset =
200 (uint8_t *)frame_header_info.coded_tile_data - frame;
201 size_t length_field_size = frame_header_info.coded_tile_data_size;
202 // Remove ext-tile tile info.
203 uint32_t frame_header_size = (uint32_t)frame_header_info.extra_size - 1;
204 size_t bytes_to_copy =
205 obu_size_offset + length_field_size + frame_header_size;
206
207 unsigned char *frame_hdr_buf = (unsigned char *)malloc(bytes_to_copy);
208 if (frame_hdr_buf == NULL)
209 die_codec(&codec, "Failed to allocate frame header buffer.");
210
211 memcpy(frame_hdr_buf, frame, bytes_to_copy);
212
213 // Update frame header OBU size.
214 size_t bytes_written = 0;
215 if (aom_uleb_encode_fixed_size(
216 frame_header_size, length_field_size, length_field_size,
217 frame_hdr_buf + obu_size_offset, &bytes_written))
218 die_codec(&codec, "Failed to encode the tile list obu size.");
219
220 // Copy camera frame header bitstream.
221 if (!aom_video_writer_write_frame(writer, frame_hdr_buf, bytes_to_copy,
222 pts))
223 die_codec(&codec, "Failed to copy compressed camera frame header.");
224 }
225
226 // Allocate a buffer to store tile list bitstream. Image format
227 // AOM_IMG_FMT_I420.
228 size_t data_sz =
229 ALIGN_POWER_OF_TWO(width, 5) * ALIGN_POWER_OF_TWO(height, 5) * 12 / 8;
230 unsigned char *tl_buf = (unsigned char *)malloc(data_sz);
231 if (tl_buf == NULL) die_codec(&codec, "Failed to allocate tile list buffer.");
232
233 aom_codec_pts_t tl_pts = pts;
234
235 // Process 1 tile list.
236 for (n = 0; n < num_tile_lists; n++) {
237 unsigned char *tl = tl_buf;
238 struct aom_write_bit_buffer wb = { tl, 0 };
239 unsigned char *saved_obu_size_loc = NULL;
240 uint32_t tile_list_obu_header_size = 0;
241 uint32_t tile_list_obu_size = 0;
242
243 // Write the tile list OBU header that is 1 byte long.
244 aom_wb_write_literal(&wb, 0, 1); // forbidden bit.
245 aom_wb_write_literal(&wb, 8, 4); // tile list OBU: "1000"
246 aom_wb_write_literal(&wb, 0, 1); // obu_extension = 0
247 aom_wb_write_literal(&wb, 1, 1); // obu_has_size_field
248 aom_wb_write_literal(&wb, 0, 1); // reserved
249 tl++;
250 tile_list_obu_header_size++;
251
252 // Write the OBU size using a fixed length_field_size of 4 bytes.
253 saved_obu_size_loc = tl;
254 aom_wb_write_literal(&wb, 0, 32);
255 tl += 4;
256 tile_list_obu_header_size += 4;
257
258 // write_tile_list_obu()
259 aom_wb_write_literal(&wb, output_frame_width_in_tiles_minus_1, 8);
260 aom_wb_write_literal(&wb, output_frame_height_in_tiles_minus_1, 8);
261 aom_wb_write_literal(&wb, tile_count_minus_1, 16);
262 tl += 4;
263 tile_list_obu_size += 4;
264
265 // Write each tile's data
266 for (i = 0; i <= tile_count_minus_1; i++) {
267 aom_tile_data tile_data = { 0, NULL, 0 };
268
269 int image_idx = tile_list[n][i].image_idx;
270 int ref_idx = tile_list[n][i].reference_idx;
271 int tc = tile_list[n][i].tile_col;
272 int tr = tile_list[n][i].tile_row;
273 int frame_cnt = -1;
274
275 // Reset bit writer to the right location.
276 wb.bit_buffer = tl;
277 wb.bit_offset = 0;
278
279 // Seek to the first camera image.
280 fseeko(infile, camera_frame_pos, SEEK_SET);
281
282 // Read out the camera image
283 while (frame_cnt != image_idx) {
284 aom_video_reader_read_frame(reader);
285 frame_cnt++;
286 }
287
288 size_t frame_size = 0;
289 const unsigned char *frame =
290 aom_video_reader_get_frame(reader, &frame_size);
291
292 aom_codec_control_(&codec, AV1_SET_DECODE_TILE_ROW, tr);
293 aom_codec_control_(&codec, AV1_SET_DECODE_TILE_COL, tc);
294
295 aom_codec_err_t aom_status =
296 aom_codec_decode(&codec, frame, frame_size, NULL);
297 if (aom_status) die_codec(&codec, "Failed to decode tile.");
298
299 aom_codec_control_(&codec, AV1D_GET_TILE_DATA, &tile_data);
300
301 // Copy over tile info.
302 // uint8_t anchor_frame_idx;
303 // uint8_t tile_row;
304 // uint8_t tile_col;
305 // uint16_t coded_tile_data_size_minus_1;
306 // uint8_t *coded_tile_data;
307 uint32_t tile_info_bytes = 5;
308 aom_wb_write_literal(&wb, ref_idx, 8);
309 aom_wb_write_literal(&wb, tr, 8);
310 aom_wb_write_literal(&wb, tc, 8);
311 aom_wb_write_literal(&wb, (int)tile_data.coded_tile_data_size - 1, 16);
312 tl += tile_info_bytes;
313
314 memcpy(tl, (uint8_t *)tile_data.coded_tile_data,
315 tile_data.coded_tile_data_size);
316 tl += tile_data.coded_tile_data_size;
317
318 tile_list_obu_size +=
319 tile_info_bytes + (uint32_t)tile_data.coded_tile_data_size;
320 }
321
322 // Write tile list OBU size.
323 size_t bytes_written = 0;
324 if (aom_uleb_encode_fixed_size(tile_list_obu_size, 4, 4, saved_obu_size_loc,
325 &bytes_written))
326 die_codec(&codec, "Failed to encode the tile list obu size.");
327
328 // Copy the tile list.
329 if (!aom_video_writer_write_frame(
330 writer, tl_buf, tile_list_obu_header_size + tile_list_obu_size,
331 tl_pts))
332 die_codec(&codec, "Failed to copy compressed tile list.");
333
334 tl_pts++;
335 }
336
337 free(tl_buf);
338 if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
339 aom_video_writer_close(writer);
340 aom_video_reader_close(reader);
341
342 return EXIT_SUCCESS;
343 }
AV1D_GET_FRAME_HEADER_INFO
Definition: aomdx.h:175
aom_encoder.h
Describes the encoder algorithm interface to applications.
aom_codec_pts_t
int64_t aom_codec_pts_t
Time Stamp Type.
Definition: aom_encoder.h:94
AV1D_GET_TILE_DATA
Definition: aomdx.h:179
aom_codec_ctx
Codec context structure.
Definition: aom_codec.h:204
aom_decoder.h
Describes the decoder algorithm interface to applications.
aom_tile_data
Structure to hold a tile&#39;s start address and size in the bitstream.
Definition: aomdx.h:67
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_control_
aom_codec_err_t aom_codec_control_(aom_codec_ctx_t *ctx, int ctrl_id,...)
Control algorithm.
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:142
aom_codec_iface_name
const char * aom_codec_iface_name(aom_codec_iface_t *iface)
Return the name for a given interface.
aom_codec_destroy
aom_codec_err_t aom_codec_destroy(aom_codec_ctx_t *ctx)
Destroy a codec instance.
AV1D_EXT_TILE_DEBUG
Definition: aomdx.h:188
aom_tile_data::extra_size
size_t extra_size
Definition: aomdx.h:73
AV1_SET_DECODE_TILE_ROW
Definition: aomdx.h:165
aom_tile_data::coded_tile_data_size
size_t coded_tile_data_size
Definition: aomdx.h:69
AV1_SET_TILE_MODE
Definition: aomdx.h:171
aom_tile_data::coded_tile_data
const void * coded_tile_data
Definition: aomdx.h:71
aom_codec_err_t
aom_codec_err_t
Algorithm return codes.
Definition: aom_codec.h:101
aomdx.h
Provides definitions for using AOM or AV1 within the aom Decoder interface.