1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19static int FUNC(frame_sync_code)(CodedBitstreamContext *ctx, RWContext *rw,
20                                 VP9RawFrameHeader *current)
21{
22    int err;
23
24    fixed(8, frame_sync_byte_0, VP9_FRAME_SYNC_0);
25    fixed(8, frame_sync_byte_1, VP9_FRAME_SYNC_1);
26    fixed(8, frame_sync_byte_2, VP9_FRAME_SYNC_2);
27
28    return 0;
29}
30
31static int FUNC(color_config)(CodedBitstreamContext *ctx, RWContext *rw,
32                              VP9RawFrameHeader *current, int profile)
33{
34    CodedBitstreamVP9Context *vp9 = ctx->priv_data;
35    int err;
36
37    if (profile >= 2) {
38        f(1, ten_or_twelve_bit);
39        vp9->bit_depth = current->ten_or_twelve_bit ? 12 : 10;
40    } else
41        vp9->bit_depth = 8;
42
43    f(3, color_space);
44
45    if (current->color_space != VP9_CS_RGB) {
46        f(1, color_range);
47        if (profile == 1 || profile == 3) {
48            f(1, subsampling_x);
49            f(1, subsampling_y);
50            fixed(1, reserved_zero, 0);
51        } else {
52            infer(subsampling_x, 1);
53            infer(subsampling_y, 1);
54        }
55    } else {
56        infer(color_range, 1);
57        if (profile == 1 || profile == 3) {
58            infer(subsampling_x, 0);
59            infer(subsampling_y, 0);
60            fixed(1, reserved_zero, 0);
61        }
62    }
63
64    vp9->subsampling_x = current->subsampling_x;
65    vp9->subsampling_y = current->subsampling_y;
66
67    return 0;
68}
69
70static int FUNC(frame_size)(CodedBitstreamContext *ctx, RWContext *rw,
71                            VP9RawFrameHeader *current)
72{
73    CodedBitstreamVP9Context *vp9 = ctx->priv_data;
74    int err;
75
76    f(16, frame_width_minus_1);
77    f(16, frame_height_minus_1);
78
79    vp9->frame_width  = current->frame_width_minus_1  + 1;
80    vp9->frame_height = current->frame_height_minus_1 + 1;
81
82    vp9->mi_cols = (vp9->frame_width  + 7) >> 3;
83    vp9->mi_rows = (vp9->frame_height + 7) >> 3;
84    vp9->sb64_cols = (vp9->mi_cols + 7) >> 3;
85    vp9->sb64_rows = (vp9->mi_rows + 7) >> 3;
86
87    return 0;
88}
89
90static int FUNC(render_size)(CodedBitstreamContext *ctx, RWContext *rw,
91                             VP9RawFrameHeader *current)
92{
93    int err;
94
95    f(1, render_and_frame_size_different);
96
97    if (current->render_and_frame_size_different) {
98        f(16, render_width_minus_1);
99        f(16, render_height_minus_1);
100    }
101
102    return 0;
103}
104
105static int FUNC(frame_size_with_refs)(CodedBitstreamContext *ctx, RWContext *rw,
106                                      VP9RawFrameHeader *current)
107{
108    CodedBitstreamVP9Context *vp9 = ctx->priv_data;
109    int err, i;
110
111    for (i = 0; i < VP9_REFS_PER_FRAME; i++) {
112        fs(1, found_ref[i], 1, i);
113        if (current->found_ref[i]) {
114            VP9ReferenceFrameState *ref =
115                &vp9->ref[current->ref_frame_idx[i]];
116
117            vp9->frame_width   = ref->frame_width;
118            vp9->frame_height  = ref->frame_height;
119
120            vp9->subsampling_x = ref->subsampling_x;
121            vp9->subsampling_y = ref->subsampling_y;
122            vp9->bit_depth     = ref->bit_depth;
123
124            break;
125        }
126    }
127    if (i >= VP9_REFS_PER_FRAME)
128        CHECK(FUNC(frame_size)(ctx, rw, current));
129    else {
130        vp9->mi_cols = (vp9->frame_width  + 7) >> 3;
131        vp9->mi_rows = (vp9->frame_height + 7) >> 3;
132        vp9->sb64_cols = (vp9->mi_cols + 7) >> 3;
133        vp9->sb64_rows = (vp9->mi_rows + 7) >> 3;
134    }
135    CHECK(FUNC(render_size)(ctx, rw, current));
136
137    return 0;
138}
139
140static int FUNC(interpolation_filter)(CodedBitstreamContext *ctx, RWContext *rw,
141                                      VP9RawFrameHeader *current)
142{
143    int err;
144
145    f(1, is_filter_switchable);
146    if (!current->is_filter_switchable)
147        f(2, raw_interpolation_filter_type);
148
149    return 0;
150}
151
152static int FUNC(loop_filter_params)(CodedBitstreamContext *ctx, RWContext *rw,
153                                    VP9RawFrameHeader *current)
154{
155    int err, i;
156
157    f(6, loop_filter_level);
158    f(3, loop_filter_sharpness);
159
160    f(1, loop_filter_delta_enabled);
161    if (current->loop_filter_delta_enabled) {
162        f(1, loop_filter_delta_update);
163        if (current->loop_filter_delta_update) {
164            for (i = 0; i < VP9_MAX_REF_FRAMES; i++) {
165                fs(1, update_ref_delta[i], 1, i);
166                if (current->update_ref_delta[i])
167                    ss(6, loop_filter_ref_deltas[i], 1, i);
168            }
169            for (i = 0; i < 2; i++) {
170                fs(1, update_mode_delta[i], 1, i);
171                if (current->update_mode_delta[i])
172                    ss(6, loop_filter_mode_deltas[i], 1, i);
173            }
174        }
175    }
176
177    return 0;
178}
179
180static int FUNC(quantization_params)(CodedBitstreamContext *ctx, RWContext *rw,
181                                     VP9RawFrameHeader *current)
182{
183    int err;
184
185    f(8, base_q_idx);
186
187    delta_q(delta_q_y_dc);
188    delta_q(delta_q_uv_dc);
189    delta_q(delta_q_uv_ac);
190
191    return 0;
192}
193
194static int FUNC(segmentation_params)(CodedBitstreamContext *ctx, RWContext *rw,
195                                     VP9RawFrameHeader *current)
196{
197    static const uint8_t segmentation_feature_bits[VP9_SEG_LVL_MAX]   = { 8, 6, 2, 0 };
198    static const uint8_t segmentation_feature_signed[VP9_SEG_LVL_MAX] = { 1, 1, 0, 0 };
199
200    int err, i, j;
201
202    f(1, segmentation_enabled);
203
204    if (current->segmentation_enabled) {
205        f(1, segmentation_update_map);
206        if (current->segmentation_update_map) {
207            for (i = 0; i < 7; i++)
208                prob(segmentation_tree_probs[i], 1, i);
209            f(1, segmentation_temporal_update);
210            for (i = 0; i < 3; i++) {
211                if (current->segmentation_temporal_update)
212                    prob(segmentation_pred_prob[i], 1, i);
213                else
214                    infer(segmentation_pred_prob[i], 255);
215            }
216        }
217
218        f(1, segmentation_update_data);
219        if (current->segmentation_update_data) {
220            f(1, segmentation_abs_or_delta_update);
221            for (i = 0; i < VP9_MAX_SEGMENTS; i++) {
222                for (j = 0; j < VP9_SEG_LVL_MAX; j++) {
223                    fs(1, feature_enabled[i][j], 2, i, j);
224                    if (current->feature_enabled[i][j] &&
225                        segmentation_feature_bits[j]) {
226                        fs(segmentation_feature_bits[j],
227                           feature_value[i][j], 2, i, j);
228                        if (segmentation_feature_signed[j])
229                            fs(1, feature_sign[i][j], 2, i, j);
230                        else
231                            infer(feature_sign[i][j], 0);
232                    } else {
233                        infer(feature_value[i][j], 0);
234                        infer(feature_sign[i][j],  0);
235                    }
236                }
237            }
238        }
239    }
240
241    return 0;
242}
243
244static int FUNC(tile_info)(CodedBitstreamContext *ctx, RWContext *rw,
245                           VP9RawFrameHeader *current)
246{
247    CodedBitstreamVP9Context *vp9 = ctx->priv_data;
248    int min_log2_tile_cols, max_log2_tile_cols;
249    int err;
250
251    min_log2_tile_cols = 0;
252    while ((VP9_MAX_TILE_WIDTH_B64 << min_log2_tile_cols) < vp9->sb64_cols)
253        ++min_log2_tile_cols;
254    max_log2_tile_cols = 0;
255    while ((vp9->sb64_cols >> (max_log2_tile_cols + 1)) >= VP9_MIN_TILE_WIDTH_B64)
256        ++max_log2_tile_cols;
257
258    increment(tile_cols_log2, min_log2_tile_cols, max_log2_tile_cols);
259
260    increment(tile_rows_log2, 0, 2);
261
262    return 0;
263}
264
265static int FUNC(uncompressed_header)(CodedBitstreamContext *ctx, RWContext *rw,
266                                     VP9RawFrameHeader *current)
267{
268    CodedBitstreamVP9Context *vp9 = ctx->priv_data;
269    int err, i;
270
271    f(2, frame_marker);
272
273    f(1, profile_low_bit);
274    f(1, profile_high_bit);
275    vp9->profile = (current->profile_high_bit << 1) + current->profile_low_bit;
276    if (vp9->profile == 3)
277        fixed(1, reserved_zero, 0);
278
279    f(1, show_existing_frame);
280    if (current->show_existing_frame) {
281        f(3, frame_to_show_map_idx);
282        infer(header_size_in_bytes, 0);
283        infer(refresh_frame_flags,  0x00);
284        infer(loop_filter_level,    0);
285        return 0;
286    }
287
288    f(1, frame_type);
289    f(1, show_frame);
290    f(1, error_resilient_mode);
291
292    if (current->frame_type == VP9_KEY_FRAME) {
293        CHECK(FUNC(frame_sync_code)(ctx, rw, current));
294        CHECK(FUNC(color_config)(ctx, rw, current, vp9->profile));
295        CHECK(FUNC(frame_size)(ctx, rw, current));
296        CHECK(FUNC(render_size)(ctx, rw, current));
297
298        infer(refresh_frame_flags, 0xff);
299
300    } else {
301         if (current->show_frame == 0)
302             f(1, intra_only);
303         else
304             infer(intra_only, 0);
305
306         if (current->error_resilient_mode == 0)
307             f(2, reset_frame_context);
308         else
309             infer(reset_frame_context, 0);
310
311         if (current->intra_only == 1) {
312             CHECK(FUNC(frame_sync_code)(ctx, rw, current));
313
314             if (vp9->profile > 0) {
315                 CHECK(FUNC(color_config)(ctx, rw, current, vp9->profile));
316             } else {
317                 infer(color_space,   1);
318                 infer(subsampling_x, 1);
319                 infer(subsampling_y, 1);
320                 vp9->bit_depth = 8;
321
322                 vp9->subsampling_x = current->subsampling_x;
323                 vp9->subsampling_y = current->subsampling_y;
324             }
325
326             f(8, refresh_frame_flags);
327
328             CHECK(FUNC(frame_size)(ctx, rw, current));
329             CHECK(FUNC(render_size)(ctx, rw, current));
330         } else {
331             f(8, refresh_frame_flags);
332
333             for (i = 0; i < VP9_REFS_PER_FRAME; i++) {
334                 fs(3, ref_frame_idx[i], 1, i);
335                 fs(1, ref_frame_sign_bias[VP9_LAST_FRAME + i],
336                    1, VP9_LAST_FRAME + i);
337             }
338
339             CHECK(FUNC(frame_size_with_refs)(ctx, rw, current));
340             f(1, allow_high_precision_mv);
341             CHECK(FUNC(interpolation_filter)(ctx, rw, current));
342         }
343    }
344
345    if (current->error_resilient_mode == 0) {
346        f(1, refresh_frame_context);
347        f(1, frame_parallel_decoding_mode);
348    } else {
349        infer(refresh_frame_context,        0);
350        infer(frame_parallel_decoding_mode, 1);
351    }
352
353    f(2, frame_context_idx);
354
355    CHECK(FUNC(loop_filter_params)(ctx, rw, current));
356    CHECK(FUNC(quantization_params)(ctx, rw, current));
357    CHECK(FUNC(segmentation_params)(ctx, rw, current));
358    CHECK(FUNC(tile_info)(ctx, rw, current));
359
360    f(16, header_size_in_bytes);
361
362    for (i = 0; i < VP9_NUM_REF_FRAMES; i++) {
363        if (current->refresh_frame_flags & (1 << i)) {
364            vp9->ref[i] = (VP9ReferenceFrameState) {
365                .frame_width    = vp9->frame_width,
366                .frame_height   = vp9->frame_height,
367                .subsampling_x  = vp9->subsampling_x,
368                .subsampling_y  = vp9->subsampling_y,
369                .bit_depth      = vp9->bit_depth,
370            };
371        }
372    }
373
374    av_log(ctx->log_ctx, AV_LOG_DEBUG, "Frame:  size %dx%d  "
375           "subsample %dx%d  bit_depth %d  tiles %dx%d.\n",
376           vp9->frame_width, vp9->frame_height,
377           vp9->subsampling_x, vp9->subsampling_y,
378           vp9->bit_depth, 1 << current->tile_cols_log2,
379           1 << current->tile_rows_log2);
380
381    return 0;
382}
383
384static int FUNC(trailing_bits)(CodedBitstreamContext *ctx, RWContext *rw)
385{
386    int err;
387    while (byte_alignment(rw) != 0)
388        fixed(1, zero_bit, 0);
389
390    return 0;
391}
392
393static int FUNC(frame)(CodedBitstreamContext *ctx, RWContext *rw,
394                       VP9RawFrame *current)
395{
396    int err;
397
398    HEADER("Frame");
399
400    CHECK(FUNC(uncompressed_header)(ctx, rw, &current->header));
401
402    CHECK(FUNC(trailing_bits)(ctx, rw));
403
404    return 0;
405}
406
407static int FUNC(superframe_index)(CodedBitstreamContext *ctx, RWContext *rw,
408                                  VP9RawSuperframeIndex *current)
409{
410    int err, i;
411
412    HEADER("Superframe Index");
413
414    f(3, superframe_marker);
415    f(2, bytes_per_framesize_minus_1);
416    f(3, frames_in_superframe_minus_1);
417
418    for (i = 0; i <= current->frames_in_superframe_minus_1; i++) {
419        // Surprise little-endian!
420        fle(8 * (current->bytes_per_framesize_minus_1 + 1),
421            frame_sizes[i], 1, i);
422    }
423
424    f(3, superframe_marker);
425    f(2, bytes_per_framesize_minus_1);
426    f(3, frames_in_superframe_minus_1);
427
428    return 0;
429}
430