aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/dovi_rpu.c
blob: 529062be30a8f8ef1dbfdbc469d3dd232c7e4dc3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
/*
 * Dolby Vision RPU decoder
 *
 * Copyright (C) 2021 Jan Ekström
 * Copyright (C) 2021 Niklas Haas
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/buffer.h"

#include "dovi_rpu.h"
#include "golomb.h"
#include "get_bits.h"
#include "refstruct.h"

enum {
    RPU_COEFF_FIXED = 0,
    RPU_COEFF_FLOAT = 1,
};

/**
 * Private contents of vdr.
 */
typedef struct DOVIVdr {
    AVDOVIDataMapping mapping;
    AVDOVIColorMetadata color;
} DOVIVdr;

void ff_dovi_ctx_unref(DOVIContext *s)
{
    for (int i = 0; i < FF_ARRAY_ELEMS(s->vdr); i++)
        ff_refstruct_unref(&s->vdr[i]);

    *s = (DOVIContext) {
        .logctx = s->logctx,
    };
}

void ff_dovi_ctx_flush(DOVIContext *s)
{
    for (int i = 0; i < FF_ARRAY_ELEMS(s->vdr); i++)
        ff_refstruct_unref(&s->vdr[i]);

    *s = (DOVIContext) {
        .logctx = s->logctx,
        .dv_profile = s->dv_profile,
    };
}

void ff_dovi_ctx_replace(DOVIContext *s, const DOVIContext *s0)
{
    s->logctx = s0->logctx;
    s->mapping = s0->mapping;
    s->color = s0->color;
    s->dv_profile = s0->dv_profile;
    for (int i = 0; i < DOVI_MAX_DM_ID; i++)
        ff_refstruct_replace(&s->vdr[i], s0->vdr[i]);
}

void ff_dovi_update_cfg(DOVIContext *s, const AVDOVIDecoderConfigurationRecord *cfg)
{
    if (!cfg)
        return;

    s->dv_profile = cfg->dv_profile;
}

int ff_dovi_attach_side_data(DOVIContext *s, AVFrame *frame)
{
    AVFrameSideData *sd;
    AVBufferRef *buf;
    AVDOVIMetadata *dovi;
    size_t dovi_size;

    if (!s->mapping || !s->color)
        return 0; /* incomplete dovi metadata */

    dovi = av_dovi_metadata_alloc(&dovi_size);
    if (!dovi)
        return AVERROR(ENOMEM);

    buf = av_buffer_create((uint8_t *) dovi, dovi_size, NULL, NULL, 0);
    if (!buf) {
        av_free(dovi);
        return AVERROR(ENOMEM);
    }

    sd = av_frame_new_side_data_from_buf(frame, AV_FRAME_DATA_DOVI_METADATA, buf);
    if (!sd) {
        av_buffer_unref(&buf);
        return AVERROR(ENOMEM);
    }

    /* Copy only the parts of these structs known to us at compiler-time. */
#define COPY(t, a, b, last) memcpy(a, b, offsetof(t, last) + sizeof((b)->last))
    COPY(AVDOVIRpuDataHeader, av_dovi_get_header(dovi), &s->header, disable_residual_flag);
    COPY(AVDOVIDataMapping, av_dovi_get_mapping(dovi), s->mapping, nlq[2].linear_deadzone_threshold);
    COPY(AVDOVIColorMetadata, av_dovi_get_color(dovi), s->color, source_diagonal);
    return 0;
}

static int guess_profile(const AVDOVIRpuDataHeader *hdr)
{
    switch (hdr->vdr_rpu_profile) {
    case 0:
        if (hdr->bl_video_full_range_flag)
            return 5;
        break;
    case 1:
        if (hdr->el_spatial_resampling_filter_flag && !hdr->disable_residual_flag) {
            if (hdr->vdr_bit_depth == 12) {
                return 7;
            } else {
                return 4;
            }
        } else {
            return 8;
        }
    }

    return 0; /* unknown */
}

static inline uint64_t get_ue_coef(GetBitContext *gb, const AVDOVIRpuDataHeader *hdr)
{
    uint64_t ipart;
    union { uint32_t u32; float f32; } fpart;

    switch (hdr->coef_data_type) {
    case RPU_COEFF_FIXED:
        ipart = get_ue_golomb_long(gb);
        fpart.u32 = get_bits_long(gb, hdr->coef_log2_denom);
        return (ipart << hdr->coef_log2_denom) + fpart.u32;

    case RPU_COEFF_FLOAT:
        fpart.u32 = get_bits_long(gb, 32);
        return fpart.f32 * (1LL << hdr->coef_log2_denom);
    }

    return 0; /* unreachable */
}

static inline int64_t get_se_coef(GetBitContext *gb, const AVDOVIRpuDataHeader *hdr)
{
    int64_t ipart;
    union { uint32_t u32; float f32; } fpart;

    switch (hdr->coef_data_type) {
    case RPU_COEFF_FIXED:
        ipart = get_se_golomb_long(gb);
        fpart.u32 = get_bits_long(gb, hdr->coef_log2_denom);
        return ipart * (1LL << hdr->coef_log2_denom) + fpart.u32;

    case RPU_COEFF_FLOAT:
        fpart.u32 = get_bits_long(gb, 32);
        return fpart.f32 * (1LL << hdr->coef_log2_denom);
    }

    return 0; /* unreachable */
}

static inline unsigned get_variable_bits(GetBitContext *gb, int n)
{
    unsigned int value = get_bits(gb, n);
    int read_more = get_bits1(gb);
    while (read_more) {
        value = (value + 1) << n;
        value |= get_bits(gb, n);
        read_more = get_bits1(gb);
    }
    return value;
}

#define VALIDATE(VAR, MIN, MAX)                                                 \
    do {                                                                        \
        if (VAR < MIN || VAR > MAX) {                                           \
            av_log(s->logctx, AV_LOG_ERROR, "RPU validation failed: "           \
                   #MIN" <= "#VAR" = %d <= "#MAX"\n", (int) VAR);               \
            goto fail;                                                          \
        }                                                                       \
    } while (0)

int ff_dovi_rpu_parse(DOVIContext *s, const uint8_t *rpu, size_t rpu_size)
{
    AVDOVIRpuDataHeader *hdr = &s->header;
    GetBitContext *gb = &(GetBitContext){0};
    DOVIVdr *vdr;
    int ret;

    uint8_t nal_prefix;
    uint8_t rpu_type;
    uint8_t vdr_seq_info_present;
    uint8_t vdr_dm_metadata_present;
    uint8_t use_prev_vdr_rpu;
    uint8_t use_nlq;
    uint8_t profile;
    if ((ret = init_get_bits8(gb, rpu, rpu_size)) < 0)
        return ret;

    /* Container header */
    if (s->dv_profile == 10 /* dav1.10 */) {
        /* DV inside AV1 re-uses an EMDF container skeleton, but with fixed
         * values - so we can effectively treat this as a magic byte sequence.
         *
         * The exact fields are, as follows:
         *   emdf_version            : f(2) = 0
         *   key_id                  : f(3) = 6
         *   emdf_payload_id         : f(5) = 31
         *   emdf_payload_id_ext     : var(5) = 225
         *   smploffste              : f(1) = 0
         *   duratione               : f(1) = 0
         *   groupide                : f(1) = 0
         *   codecdatae              : f(1) = 0
         *   discard_unknown_payload : f(1) = 1
         */
        const unsigned header_magic = 0x01be6841u;
        unsigned header, emdf_payload_size;
        header = get_bits_long(gb, 27);
        VALIDATE(header, header_magic, header_magic);
        emdf_payload_size = get_variable_bits(gb, 8);
        VALIDATE(emdf_payload_size, 6, 512);
        if (emdf_payload_size * 8 > get_bits_left(gb))
            return AVERROR_INVALIDDATA;
    } else {
        nal_prefix = get_bits(gb, 8);
        VALIDATE(nal_prefix, 25, 25);
    }

    /* RPU header */
    rpu_type = get_bits(gb, 6);
    if (rpu_type != 2) {
        av_log(s->logctx, AV_LOG_WARNING, "Unrecognized RPU type "
               "%"PRIu8", ignoring\n", rpu_type);
        return 0;
    }

    hdr->rpu_type = rpu_type;
    hdr->rpu_format = get_bits(gb, 11);

    /* Values specific to RPU type 2 */
    hdr->vdr_rpu_profile = get_bits(gb, 4);
    hdr->vdr_rpu_level = get_bits(gb, 4);

    vdr_seq_info_present = get_bits1(gb);
    if (vdr_seq_info_present) {
        hdr->chroma_resampling_explicit_filter_flag = get_bits1(gb);
        hdr->coef_data_type = get_bits(gb, 2);
        VALIDATE(hdr->coef_data_type, RPU_COEFF_FIXED, RPU_COEFF_FLOAT);
        switch (hdr->coef_data_type) {
        case RPU_COEFF_FIXED:
            hdr->coef_log2_denom = get_ue_golomb(gb);
            VALIDATE(hdr->coef_log2_denom, 13, 32);
            break;
        case RPU_COEFF_FLOAT:
            hdr->coef_log2_denom = 32; /* arbitrary, choose maximum precision */
            break;
        }

        hdr->vdr_rpu_normalized_idc = get_bits(gb, 2);
        hdr->bl_video_full_range_flag = get_bits1(gb);

        if ((hdr->rpu_format & 0x700) == 0) {
            int bl_bit_depth_minus8 = get_ue_golomb_31(gb);
            int el_bit_depth_minus8 = get_ue_golomb_31(gb);
            int vdr_bit_depth_minus8 = get_ue_golomb_31(gb);
            VALIDATE(bl_bit_depth_minus8, 0, 8);
            VALIDATE(el_bit_depth_minus8, 0, 8);
            VALIDATE(vdr_bit_depth_minus8, 0, 8);
            hdr->bl_bit_depth = bl_bit_depth_minus8 + 8;
            hdr->el_bit_depth = el_bit_depth_minus8 + 8;
            hdr->vdr_bit_depth = vdr_bit_depth_minus8 + 8;
            hdr->spatial_resampling_filter_flag = get_bits1(gb);
            skip_bits(gb, 3); /* reserved_zero_3bits */
            hdr->el_spatial_resampling_filter_flag = get_bits1(gb);
            hdr->disable_residual_flag = get_bits1(gb);
        }
    }

    if (!hdr->bl_bit_depth) {
        av_log(s->logctx, AV_LOG_ERROR, "Missing RPU VDR sequence info?\n");
        goto fail;
    }

    vdr_dm_metadata_present = get_bits1(gb);
    use_prev_vdr_rpu = get_bits1(gb);
    use_nlq = (hdr->rpu_format & 0x700) == 0 && !hdr->disable_residual_flag;

    profile = s->dv_profile ? s->dv_profile : guess_profile(hdr);
    if (profile == 5 && use_nlq) {
        av_log(s->logctx, AV_LOG_ERROR, "Profile 5 RPUs should not use NLQ\n");
        goto fail;
    }

    if (use_prev_vdr_rpu) {
        int prev_vdr_rpu_id = get_ue_golomb_31(gb);
        VALIDATE(prev_vdr_rpu_id, 0, DOVI_MAX_DM_ID);
        if (!s->vdr[prev_vdr_rpu_id]) {
            av_log(s->logctx, AV_LOG_ERROR, "Unknown previous RPU ID: %u\n",
                   prev_vdr_rpu_id);
            goto fail;
        }
        vdr = s->vdr[prev_vdr_rpu_id];
        s->mapping = &vdr->mapping;
    } else {
        int vdr_rpu_id = get_ue_golomb_31(gb);
        VALIDATE(vdr_rpu_id, 0, DOVI_MAX_DM_ID);
        if (!s->vdr[vdr_rpu_id]) {
            s->vdr[vdr_rpu_id] = ff_refstruct_allocz(sizeof(DOVIVdr));
            if (!s->vdr[vdr_rpu_id])
                return AVERROR(ENOMEM);
        }

        vdr = s->vdr[vdr_rpu_id];
        s->mapping = &vdr->mapping;

        vdr->mapping.vdr_rpu_id = vdr_rpu_id;
        vdr->mapping.mapping_color_space = get_ue_golomb_31(gb);
        vdr->mapping.mapping_chroma_format_idc = get_ue_golomb_31(gb);

        for (int c = 0; c < 3; c++) {
            AVDOVIReshapingCurve *curve = &vdr->mapping.curves[c];
            int num_pivots_minus_2 = get_ue_golomb_31(gb);
            int pivot = 0;

            VALIDATE(num_pivots_minus_2, 0, AV_DOVI_MAX_PIECES - 1);
            curve->num_pivots = num_pivots_minus_2 + 2;
            for (int i = 0; i < curve->num_pivots; i++) {
                pivot += get_bits(gb, hdr->bl_bit_depth);
                curve->pivots[i] = av_clip_uint16(pivot);
            }
        }

        if (use_nlq) {
            vdr->mapping.nlq_method_idc = get_bits(gb, 3);
            /**
             * The patent mentions another legal value, NLQ_MU_LAW, but it's
             * not documented anywhere how to parse or apply that type of NLQ.
             */
            VALIDATE(vdr->mapping.nlq_method_idc, 0, AV_DOVI_NLQ_LINEAR_DZ);
        } else {
            vdr->mapping.nlq_method_idc = AV_DOVI_NLQ_NONE;
        }

        vdr->mapping.num_x_partitions = get_ue_golomb_long(gb) + 1;
        vdr->mapping.num_y_partitions = get_ue_golomb_long(gb) + 1;
        /* End of rpu_data_header(), start of vdr_rpu_data_payload() */

        for (int c = 0; c < 3; c++) {
            AVDOVIReshapingCurve *curve = &vdr->mapping.curves[c];
            for (int i = 0; i < curve->num_pivots - 1; i++) {
                int mapping_idc = get_ue_golomb_31(gb);
                VALIDATE(mapping_idc, 0, 1);
                curve->mapping_idc[i] = mapping_idc;
                switch (mapping_idc) {
                case AV_DOVI_MAPPING_POLYNOMIAL: {
                    int poly_order_minus1 = get_ue_golomb_31(gb);
                    VALIDATE(poly_order_minus1, 0, 1);
                    curve->poly_order[i] = poly_order_minus1 + 1;
                    if (poly_order_minus1 == 0) {
                        int linear_interp_flag = get_bits1(gb);
                        if (linear_interp_flag) {
                            /* lack of documentation/samples */
                            avpriv_request_sample(s->logctx, "Dolby Vision "
                                                  "linear interpolation");
                            ff_dovi_ctx_unref(s);
                            return AVERROR_PATCHWELCOME;
                        }
                    }
                    for (int k = 0; k <= curve->poly_order[i]; k++)
                        curve->poly_coef[i][k] = get_se_coef(gb, hdr);
                    break;
                }
                case AV_DOVI_MAPPING_MMR: {
                    int mmr_order_minus1 = get_bits(gb, 2);
                    VALIDATE(mmr_order_minus1, 0, 2);
                    curve->mmr_order[i] = mmr_order_minus1 + 1;
                    curve->mmr_constant[i] = get_se_coef(gb, hdr);
                    for (int j = 0; j < curve->mmr_order[i]; j++) {
                        for (int k = 0; k < 7; k++)
                            curve->mmr_coef[i][j][k] = get_se_coef(gb, hdr);
                    }
                    break;
                }
                }
            }
        }

        if (use_nlq) {
            for (int c = 0; c < 3; c++) {
                AVDOVINLQParams *nlq = &vdr->mapping.nlq[c];
                nlq->nlq_offset = get_bits(gb, hdr->el_bit_depth);
                nlq->vdr_in_max = get_ue_coef(gb, hdr);
                switch (vdr->mapping.nlq_method_idc) {
                case AV_DOVI_NLQ_LINEAR_DZ:
                    nlq->linear_deadzone_slope = get_ue_coef(gb, hdr);
                    nlq->linear_deadzone_threshold = get_ue_coef(gb, hdr);
                    break;
                }
            }
        }
    }

    if (vdr_dm_metadata_present) {
        AVDOVIColorMetadata *color;
        int affected_dm_id = get_ue_golomb_31(gb);
        int current_dm_id = get_ue_golomb_31(gb);
        VALIDATE(affected_dm_id, 0, DOVI_MAX_DM_ID);
        VALIDATE(current_dm_id, 0, DOVI_MAX_DM_ID);
        if (!s->vdr[affected_dm_id]) {
            s->vdr[affected_dm_id] = ff_refstruct_allocz(sizeof(DOVIVdr));
            if (!s->vdr[affected_dm_id])
                return AVERROR(ENOMEM);
        }

        if (!s->vdr[current_dm_id]) {
            av_log(s->logctx, AV_LOG_ERROR, "Unknown previous RPU DM ID: %u\n",
                   current_dm_id);
            goto fail;
        }

        /* Update current pointer based on current_dm_id */
        vdr = s->vdr[current_dm_id];
        s->color = &vdr->color;

        /* Update values of affected_dm_id */
        vdr = s->vdr[affected_dm_id];
        color = &vdr->color;
        color->dm_metadata_id = affected_dm_id;
        color->scene_refresh_flag = get_ue_golomb_31(gb);
        for (int i = 0; i < 9; i++)
            color->ycc_to_rgb_matrix[i] = av_make_q(get_sbits(gb, 16), 1 << 13);
        for (int i = 0; i < 3; i++) {
            int denom = profile == 4 ? (1 << 30) : (1 << 28);
            unsigned offset = get_bits_long(gb, 32);
            if (offset > INT_MAX) {
                /* Ensure the result fits inside AVRational */
                offset >>= 1;
                denom >>= 1;
            }
            color->ycc_to_rgb_offset[i] = av_make_q(offset, denom);
        }
        for (int i = 0; i < 9; i++)
            color->rgb_to_lms_matrix[i] = av_make_q(get_sbits(gb, 16), 1 << 14);

        color->signal_eotf = get_bits(gb, 16);
        color->signal_eotf_param0 = get_bits(gb, 16);
        color->signal_eotf_param1 = get_bits(gb, 16);
        color->signal_eotf_param2 = get_bits_long(gb, 32);
        color->signal_bit_depth = get_bits(gb, 5);
        VALIDATE(color->signal_bit_depth, 8, 16);
        color->signal_color_space = get_bits(gb, 2);
        color->signal_chroma_format = get_bits(gb, 2);
        color->signal_full_range_flag = get_bits(gb, 2);
        color->source_min_pq = get_bits(gb, 12);
        color->source_max_pq = get_bits(gb, 12);
        color->source_diagonal = get_bits(gb, 10);
    }

    /* FIXME: verify CRC32, requires implementation of AV_CRC_32_MPEG_2 */
    return 0;

fail:
    ff_dovi_ctx_unref(s); /* don't leak potentially invalid state */
    return AVERROR(EINVAL);
}