aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/evc.c
blob: 95f07266b0346f6bdae3198b5787e6527c4526a5 (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
/*
 * EVC helper functions for muxers
 * Copyright (c) 2022 Dawid Kozinski <d.kozinski@samsung.com>
 *
 * 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/intreadwrite.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/golomb.h"
#include "libavcodec/evc.h"
#include "avformat.h"
#include "avio.h"
#include "evc.h"
#include "avio_internal.h"

// @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.1
enum {
    SPS_INDEX,
    PPS_INDEX,
    APS_INDEX,
    SEI_INDEX,
    NB_ARRAYS
};

// @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
typedef struct EVCNALUnitArray {
    uint8_t  array_completeness; // when equal to 1 indicates that all NAL units of the given type are in the following array
    uint8_t  NAL_unit_type;      // indicates the type of the NAL units in the following array
    uint16_t numNalus;           // indicates the number of NAL units of the indicated type
    uint16_t *nalUnitLength;     // indicates the length in bytes of the NAL unit
    uint8_t  **nalUnit;          // contains an SPS, PPS, APS or a SEI NAL unit, as specified in ISO/IEC 23094-1
} EVCNALUnitArray;

/**
 * @brief Specifies the decoder configuration information for ISO/IEC 23094-1 video content.
 * @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.2
 *      Carriage of network abstraction layer (NAL) unit structured video in the ISO base media file format
 */
typedef struct EVCDecoderConfigurationRecord {
    uint8_t  configurationVersion;          // 8 bits
    uint8_t  profile_idc;                   // 8 bits
    uint8_t  level_idc;                     // 8 bits
    uint32_t toolset_idc_h;                 // 32 bits
    uint32_t toolset_idc_l;                 // 32 bits
    uint8_t  chroma_format_idc;             // 2 bits
    uint8_t  bit_depth_luma_minus8;         // 3 bits
    uint8_t  bit_depth_chroma_minus8;       // 3 bits
    uint16_t pic_width_in_luma_samples;     // 16 bits
    uint16_t pic_height_in_luma_samples;    // 16 bits
    uint8_t  reserved;                      // 6 bits '000000'b
    uint8_t  lengthSizeMinusOne;            // 2 bits
    uint8_t  num_of_arrays;                 // 8 bits
    EVCNALUnitArray arrays[NB_ARRAYS];
} EVCDecoderConfigurationRecord;

typedef struct NALU {
    int offset;
    uint32_t size;
} NALU;

typedef struct NALUList {
    NALU *nalus;
    unsigned nalus_array_size;
    unsigned nb_nalus;          ///< valid entries in nalus
} NALUList;

// @see ISO_IEC_23094-1 (7.3.2.1 SPS RBSP syntax)
static int evcc_parse_sps(const uint8_t *bs, int bs_size, EVCDecoderConfigurationRecord *evcc)
{
    GetBitContext gb;
    unsigned sps_seq_parameter_set_id;
    int ret;

    bs += EVC_NALU_HEADER_SIZE;
    bs_size -= EVC_NALU_HEADER_SIZE;

    ret = init_get_bits8(&gb, bs, bs_size);
    if (ret < 0)
        return ret;

    sps_seq_parameter_set_id = get_ue_golomb_long(&gb);

    if (sps_seq_parameter_set_id >= EVC_MAX_SPS_COUNT)
        return AVERROR_INVALIDDATA;

    // the Baseline profile is indicated by profile_idc eqal to 0
    // the Main profile is indicated by profile_idc eqal to 1
    evcc->profile_idc = get_bits(&gb, 8);

    evcc->level_idc = get_bits(&gb, 8);

    evcc->toolset_idc_h = get_bits_long(&gb, 32);
    evcc->toolset_idc_l = get_bits_long(&gb, 32);

    // 0 - monochrome
    // 1 - 4:2:0
    // 2 - 4:2:2
    // 3 - 4:4:4
    evcc->chroma_format_idc = get_ue_golomb_long(&gb);
    if (evcc->chroma_format_idc > 3)
        return AVERROR_INVALIDDATA;

    evcc->pic_width_in_luma_samples = get_ue_golomb_long(&gb);
    evcc->pic_height_in_luma_samples = get_ue_golomb_long(&gb);

    evcc->bit_depth_luma_minus8 = get_ue_golomb_long(&gb);
    evcc->bit_depth_chroma_minus8 = get_ue_golomb_long(&gb);
    // EVCDecoderConfigurationRecord can't store values > 7. Limit it to bit depth 14.
    if (evcc->bit_depth_luma_minus8 > 6 || evcc->bit_depth_chroma_minus8 > 6)
        return AVERROR_INVALIDDATA;

    return 0;
}

// @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
static int evcc_array_add_nal_unit(const uint8_t *nal_buf, uint32_t nal_size,
                                   uint8_t nal_type, int ps_array_completeness,
                                   EVCNALUnitArray *array)
{
    int ret;
    uint16_t numNalus = array->numNalus;

    ret = av_reallocp_array(&array->nalUnit, numNalus + 1, sizeof(uint8_t *));
    if (ret < 0)
        return ret;

    ret = av_reallocp_array(&array->nalUnitLength, numNalus + 1, sizeof(uint16_t));
    if (ret < 0)
        return ret;

    array->nalUnit      [numNalus] = (uint8_t *)nal_buf;
    array->nalUnitLength[numNalus] = nal_size;
    array->NAL_unit_type           = nal_type;
    array->numNalus++;

    /*
     * When the sample entry name is 'evc1', the default and mandatory value of
     * array_completeness is 1 for arrays of all types of parameter sets, and 0
     * for all other arrays.
     */
    if (nal_type == EVC_SPS_NUT || nal_type == EVC_PPS_NUT || nal_type == EVC_APS_NUT)
        array->array_completeness = ps_array_completeness;

    return 0;
}

static void evcc_init(EVCDecoderConfigurationRecord *evcc)
{
    memset(evcc, 0, sizeof(EVCDecoderConfigurationRecord));
    evcc->configurationVersion = 1;
    evcc->lengthSizeMinusOne   = 3; // 4 bytes
}

static void evcc_close(EVCDecoderConfigurationRecord *evcc)
{
    for (unsigned i = 0; i < FF_ARRAY_ELEMS(evcc->arrays); i++) {
        EVCNALUnitArray *const array = &evcc->arrays[i];
        array->numNalus = 0;
        av_freep(&array->nalUnit);
        av_freep(&array->nalUnitLength);
    }
}

static int evcc_write(AVIOContext *pb, EVCDecoderConfigurationRecord *evcc)
{
    uint16_t sps_count;

    av_log(NULL, AV_LOG_TRACE,  "configurationVersion:                %"PRIu8"\n",
           evcc->configurationVersion);
    av_log(NULL, AV_LOG_TRACE,  "profile_idc:                         %"PRIu8"\n",
           evcc->profile_idc);
    av_log(NULL, AV_LOG_TRACE,  "level_idc:                           %"PRIu8"\n",
           evcc->level_idc);
    av_log(NULL, AV_LOG_TRACE,  "toolset_idc_h:                       %"PRIu32"\n",
           evcc->toolset_idc_h);
    av_log(NULL, AV_LOG_TRACE, "toolset_idc_l:                        %"PRIu32"\n",
           evcc->toolset_idc_l);
    av_log(NULL, AV_LOG_TRACE, "chroma_format_idc:                    %"PRIu8"\n",
           evcc->chroma_format_idc);
    av_log(NULL, AV_LOG_TRACE,  "bit_depth_luma_minus8:               %"PRIu8"\n",
           evcc->bit_depth_luma_minus8);
    av_log(NULL, AV_LOG_TRACE,  "bit_depth_chroma_minus8:             %"PRIu8"\n",
           evcc->bit_depth_chroma_minus8);
    av_log(NULL, AV_LOG_TRACE,  "pic_width_in_luma_samples:           %"PRIu16"\n",
           evcc->pic_width_in_luma_samples);
    av_log(NULL, AV_LOG_TRACE,  "pic_height_in_luma_samples:          %"PRIu16"\n",
           evcc->pic_height_in_luma_samples);
    av_log(NULL, AV_LOG_TRACE,  "lengthSizeMinusOne:                  %"PRIu8"\n",
           evcc->lengthSizeMinusOne);
    av_log(NULL, AV_LOG_TRACE,  "num_of_arrays:                       %"PRIu8"\n",
           evcc->num_of_arrays);
    for (unsigned i = 0; i < FF_ARRAY_ELEMS(evcc->arrays); i++) {
        const EVCNALUnitArray *const array = &evcc->arrays[i];

        if(array->numNalus == 0)
            continue;

        av_log(NULL, AV_LOG_TRACE, "array_completeness[%"PRIu8"]:               %"PRIu8"\n",
               i, array->array_completeness);
        av_log(NULL, AV_LOG_TRACE, "NAL_unit_type[%"PRIu8"]:                    %"PRIu8"\n",
               i, array->NAL_unit_type);
        av_log(NULL, AV_LOG_TRACE, "numNalus[%"PRIu8"]:                         %"PRIu16"\n",
               i, array->numNalus);
        for ( unsigned j = 0; j < array->numNalus; j++)
            av_log(NULL, AV_LOG_TRACE,
                   "nalUnitLength[%"PRIu8"][%"PRIu16"]:                 %"PRIu16"\n",
                   i, j, array->nalUnitLength[j]);
    }

    /*
     * We need at least one SPS.
     */
    sps_count = evcc->arrays[SPS_INDEX].numNalus;
    if (!sps_count || sps_count > EVC_MAX_SPS_COUNT)
        return AVERROR_INVALIDDATA;

    /* unsigned int(8) configurationVersion = 1; */
    avio_w8(pb, evcc->configurationVersion);

    /* unsigned int(8) profile_idc */
    avio_w8(pb, evcc->profile_idc);

    /* unsigned int(8) profile_idc */
    avio_w8(pb, evcc->level_idc);

    /* unsigned int(32) toolset_idc_h */
    avio_wb32(pb, evcc->toolset_idc_h);

    /* unsigned int(32) toolset_idc_l */
    avio_wb32(pb, evcc->toolset_idc_l);

    /*
     * unsigned int(2) chroma_format_idc;
     * unsigned int(3) bit_depth_luma_minus8;
     * unsigned int(3) bit_depth_chroma_minus8;
     */
    avio_w8(pb, evcc->chroma_format_idc << 6 |
            evcc->bit_depth_luma_minus8  << 3 |
            evcc->bit_depth_chroma_minus8);

    /* unsigned int(16) pic_width_in_luma_samples; */
    avio_wb16(pb, evcc->pic_width_in_luma_samples);

    /* unsigned int(16) pic_width_in_luma_samples; */
    avio_wb16(pb, evcc->pic_height_in_luma_samples);

    /*
     * bit(6) reserved = '111111'b;
     * unsigned int(2) chromaFormat;
     */
    avio_w8(pb, evcc->lengthSizeMinusOne | 0xfc);

    /* unsigned int(8) numOfArrays; */
    avio_w8(pb, evcc->num_of_arrays);

    for (unsigned i = 0; i < FF_ARRAY_ELEMS(evcc->arrays); i++) {
        const EVCNALUnitArray *const array = &evcc->arrays[i];

        if (!array->numNalus)
            continue;

        /*
         * bit(1) array_completeness;
         * unsigned int(1) reserved = 0;
         * unsigned int(6) NAL_unit_type;
         */
        avio_w8(pb, array->array_completeness << 7 |
                array->NAL_unit_type & 0x3f);

        /* unsigned int(16) numNalus; */
        avio_wb16(pb, array->numNalus);

        for (unsigned j = 0; j < array->numNalus; j++) {
            /* unsigned int(16) nalUnitLength; */
            avio_wb16(pb, array->nalUnitLength[j]);

            /* bit(8*nalUnitLength) nalUnit; */
            avio_write(pb, array->nalUnit[j],
                       array->nalUnitLength[j]);
        }
    }

    return 0;
}

int ff_isom_write_evcc(AVIOContext *pb, const uint8_t *data,
                       int size, int ps_array_completeness)
{
    EVCDecoderConfigurationRecord evcc;
    int nalu_type;
    size_t nalu_size;
    int bytes_to_read = size;
    unsigned array_index;

    int ret = 0;

    if (size < 8) {
        /* We can't write a valid evcC from the provided data */
        return AVERROR_INVALIDDATA;
    } else if (*data == 1) {
        /* Data is already evcC-formatted */
        avio_write(pb, data, size);
        return 0;
    }

    evcc_init(&evcc);

    while (bytes_to_read > EVC_NALU_LENGTH_PREFIX_SIZE) {
        nalu_size = evc_read_nal_unit_length(data, EVC_NALU_LENGTH_PREFIX_SIZE);
        if (nalu_size == 0) break;

        data += EVC_NALU_LENGTH_PREFIX_SIZE;
        bytes_to_read -= EVC_NALU_LENGTH_PREFIX_SIZE;

        if (bytes_to_read < nalu_size) break;

        nalu_type = evc_get_nalu_type(data, bytes_to_read);
        if (nalu_type < EVC_NOIDR_NUT || nalu_type > EVC_UNSPEC_NUT62) {
            ret = AVERROR_INVALIDDATA;
            goto end;
        }

        // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
        // NAL_unit_type indicates the type of the NAL units in the following array (which shall be all of that type);
        // - it takes a value as defined in ISO/IEC 23094-1;
        // - it is restricted to take one of the values indicating a SPS, PPS, APS, or SEI NAL unit.
        switch (nalu_type) {
        case EVC_SPS_NUT:
            array_index = SPS_INDEX;
            break;
        case EVC_PPS_NUT:
            array_index = PPS_INDEX;
            break;
        case EVC_APS_NUT:
            array_index = APS_INDEX;
            break;
        case EVC_SEI_NUT:
            array_index = SEI_INDEX;
            break;
        default:
            array_index = -1;
            break;
        }

        if( (array_index == SPS_INDEX) ||
            (array_index == PPS_INDEX) ||
            (array_index == APS_INDEX) ||
            (array_index == SEI_INDEX) ) {

            ret = evcc_array_add_nal_unit(data, nalu_size, nalu_type, ps_array_completeness, &(evcc.arrays[array_index]));

            if (ret < 0)
                goto end;
            if (evcc.arrays[array_index].numNalus == 1)
                evcc.num_of_arrays++;

            if(nalu_type == EVC_SPS_NUT) {
                ret = evcc_parse_sps(data, nalu_size, &evcc);
                if (ret < 0)
                    goto end;
            }
        }

        data += nalu_size;
        bytes_to_read -= nalu_size;
    }

    ret = evcc_write(pb, &evcc);

end:
    evcc_close(&evcc);
    return ret;
}