FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/evc_parser.c
Date: 2024-02-16 17:37:06
Exec Total Coverage
Lines: 111 168 66.1%
Functions: 5 5 100.0%
Branches: 49 91 53.8%

Line Branch Exec Source
1 /*
2 * EVC format parser
3 *
4 * Copyright (C) 2021 Dawid Kozinski <d.kozinski@samsung.com>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "avcodec.h"
24 #include "bytestream.h"
25 #include "evc.h"
26 #include "evc_parse.h"
27
28 typedef struct EVCParserContext {
29 EVCParamSets ps;
30 EVCParserPoc poc;
31
32 int parsed_extradata;
33 } EVCParserContext;
34
35 #define NUM_CHROMA_FORMATS 4 // @see ISO_IEC_23094-1 section 6.2 table 2
36
37 static const enum AVPixelFormat pix_fmts_8bit[NUM_CHROMA_FORMATS] = {
38 AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P
39 };
40
41 static const enum AVPixelFormat pix_fmts_9bit[NUM_CHROMA_FORMATS] = {
42 AV_PIX_FMT_GRAY9, AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9
43 };
44
45 static const enum AVPixelFormat pix_fmts_10bit[NUM_CHROMA_FORMATS] = {
46 AV_PIX_FMT_GRAY10, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10
47 };
48
49 static const enum AVPixelFormat pix_fmts_12bit[NUM_CHROMA_FORMATS] = {
50 AV_PIX_FMT_GRAY12, AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12
51 };
52
53 static const enum AVPixelFormat pix_fmts_14bit[NUM_CHROMA_FORMATS] = {
54 AV_PIX_FMT_GRAY14, AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14
55 };
56
57 static const enum AVPixelFormat pix_fmts_16bit[NUM_CHROMA_FORMATS] = {
58 AV_PIX_FMT_GRAY16, AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16
59 };
60
61 609 static int parse_nal_unit(AVCodecParserContext *s, AVCodecContext *avctx,
62 const uint8_t *buf, int buf_size)
63 {
64 609 EVCParserContext *ctx = s->priv_data;
65 GetBitContext gb;
66 int nalu_type, tid;
67 int ret;
68
69
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609 if (buf_size <= 0) {
70 av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit size: (%d)\n", buf_size);
71 return AVERROR_INVALIDDATA;
72 }
73
74 609 ret = init_get_bits8(&gb, buf, buf_size);
75
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609 if (ret < 0)
76 return ret;
77
78 // @see ISO_IEC_23094-1_2020, 7.4.2.2 NAL unit header semantic (Table 4 - NAL unit type codes and NAL unit type classes)
79 // @see enum EVCNALUnitType in evc.h
80
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609 if (get_bits1(&gb)) {// forbidden_zero_bit
81 av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit header\n");
82 return AVERROR_INVALIDDATA;
83 }
84
85 609 nalu_type = get_bits(&gb, 6) - 1;
86
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609 if (nalu_type < EVC_NOIDR_NUT || nalu_type > EVC_UNSPEC_NUT62) {
87 av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit type: (%d)\n", nalu_type);
88 return AVERROR_INVALIDDATA;
89 }
90
91 609 tid = get_bits(&gb, 3);
92 609 skip_bits(&gb, 5); // nuh_reserved_zero_5bits
93 609 skip_bits1(&gb); // nuh_extension_flag
94
95
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609 switch (nalu_type) {
96 3 case EVC_SPS_NUT:
97 3 ret = ff_evc_parse_sps(&gb, &ctx->ps);
98
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3 if (ret < 0) {
99 av_log(avctx, AV_LOG_ERROR, "SPS parsing error\n");
100 return ret;
101 }
102 3 break;
103 3 case EVC_PPS_NUT:
104 3 ret = ff_evc_parse_pps(&gb, &ctx->ps);
105
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3 if (ret < 0) {
106 av_log(avctx, AV_LOG_ERROR, "PPS parsing error\n");
107 return ret;
108 }
109 3 break;
110 600 case EVC_IDR_NUT: // Coded slice of a IDR or non-IDR picture
111 case EVC_NOIDR_NUT: {
112 const EVCParserPPS *pps;
113 const EVCParserSPS *sps;
114 EVCParserSliceHeader sh;
115 int bit_depth;
116
117 600 ret = ff_evc_parse_slice_header(&gb, &sh, &ctx->ps, nalu_type);
118
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600 if (ret < 0) {
119 av_log(avctx, AV_LOG_ERROR, "Slice header parsing error\n");
120 return ret;
121 }
122
123 600 pps = ctx->ps.pps[sh.slice_pic_parameter_set_id];
124 600 sps = ctx->ps.sps[pps->pps_seq_parameter_set_id];
125
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600 av_assert0(sps && pps);
126
127 600 s->coded_width = sps->pic_width_in_luma_samples;
128 600 s->coded_height = sps->pic_height_in_luma_samples;
129
130
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600 if (sps->picture_cropping_flag) {
131 s->width = sps->pic_width_in_luma_samples - sps->picture_crop_left_offset - sps->picture_crop_right_offset;
132 s->height = sps->pic_height_in_luma_samples - sps->picture_crop_top_offset - sps->picture_crop_bottom_offset;
133 } else {
134 600 s->width = sps->pic_width_in_luma_samples;
135 600 s->height = sps->pic_height_in_luma_samples;
136 }
137
138
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600 switch (sh.slice_type) {
139 598 case EVC_SLICE_TYPE_B: {
140 598 s->pict_type = AV_PICTURE_TYPE_B;
141 598 break;
142 }
143 case EVC_SLICE_TYPE_P: {
144 s->pict_type = AV_PICTURE_TYPE_P;
145 break;
146 }
147 2 case EVC_SLICE_TYPE_I: {
148 2 s->pict_type = AV_PICTURE_TYPE_I;
149 2 break;
150 }
151 default: {
152 s->pict_type = AV_PICTURE_TYPE_NONE;
153 }
154 }
155
156 600 avctx->profile = sps->profile_idc;
157
158
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600 if (sps->vui_parameters_present_flag && sps->vui_parameters.timing_info_present_flag) {
159 int64_t num = sps->vui_parameters.num_units_in_tick;
160 int64_t den = sps->vui_parameters.time_scale;
161 if (num != 0 && den != 0)
162 av_reduce(&avctx->framerate.den, &avctx->framerate.num, num, den, 1 << 30);
163 } else
164 600 avctx->framerate = (AVRational) { 0, 1 };
165
166 600 bit_depth = sps->bit_depth_chroma_minus8 + 8;
167
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600 s->format = AV_PIX_FMT_NONE;
168
169 switch (bit_depth) {
170 case 8:
171 s->format = pix_fmts_8bit[sps->chroma_format_idc];
172 break;
173 case 9:
174 s->format = pix_fmts_9bit[sps->chroma_format_idc];
175 break;
176 600 case 10:
177 600 s->format = pix_fmts_10bit[sps->chroma_format_idc];
178 600 break;
179 case 12:
180 s->format = pix_fmts_12bit[sps->chroma_format_idc];
181 break;
182 case 14:
183 s->format = pix_fmts_14bit[sps->chroma_format_idc];
184 break;
185 case 16:
186 s->format = pix_fmts_16bit[sps->chroma_format_idc];
187 break;
188 }
189
190 600 s->key_frame = (nalu_type == EVC_IDR_NUT) ? 1 : 0;
191
192 // POC (picture order count of the current picture) derivation
193 // @see ISO/IEC 23094-1:2020(E) 8.3.1 Decoding process for picture order count
194 600 ret = ff_evc_derive_poc(&ctx->ps, &sh, &ctx->poc, nalu_type, tid);
195
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600 if (ret < 0)
196 return ret;
197
198 600 s->output_picture_number = ctx->poc.PicOrderCntVal;
199
200 600 break;
201 }
202 3 case EVC_SEI_NUT: // Supplemental Enhancement Information
203 case EVC_APS_NUT: // Adaptation parameter set
204 case EVC_FD_NUT: // Filler data
205 default:
206 3 break;
207 }
208
209 609 return 0;
210 }
211
212 /**
213 * Parse NAL units of found picture and decode some basic information.
214 *
215 * @param s codec parser context
216 * @param avctx codec context
217 * @param buf buffer with field/frame data
218 * @param buf_size size of the buffer
219 */
220 602 static int parse_nal_units(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t *buf, int buf_size)
221 {
222 602 const uint8_t *data = buf;
223 602 int data_size = buf_size;
224
225
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1208 while (data_size > 0) {
226 606 int nalu_size = 0;
227 int ret;
228
229 // Buffer size is not enough for buffer to store NAL unit 4-bytes prefix (length)
230
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606 if (data_size < EVC_NALU_LENGTH_PREFIX_SIZE)
231 return AVERROR_INVALIDDATA;
232
233 606 nalu_size = evc_read_nal_unit_length(data, data_size, avctx);
234
235
236 606 data += EVC_NALU_LENGTH_PREFIX_SIZE;
237 606 data_size -= EVC_NALU_LENGTH_PREFIX_SIZE;
238
239
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606 if (data_size < nalu_size)
240 return AVERROR_INVALIDDATA;
241
242 606 ret = parse_nal_unit(s, avctx, data, nalu_size);
243
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606 if (ret < 0) {
244 av_log(avctx, AV_LOG_ERROR, "Parsing of NAL unit failed\n");
245 return AVERROR_INVALIDDATA;
246 }
247
248 606 data += nalu_size;
249 606 data_size -= nalu_size;
250 }
251 602 return 0;
252 }
253
254 // Decoding nal units from evcC (EVCDecoderConfigurationRecord)
255 // @see @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.2
256 1 static int decode_extradata(AVCodecParserContext *s, AVCodecContext *avctx)
257 {
258 1 const uint8_t *data = avctx->extradata;
259 1 int size = avctx->extradata_size;
260 1 int ret = 0;
261 GetByteContext gb;
262
263 1 bytestream2_init(&gb, data, size);
264
265
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1 if (!data || size <= 0)
266 return -1;
267
268 // extradata is encoded as evcC format.
269
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1 if (data[0] == 1) {
270 int num_of_arrays; // indicates the number of arrays of NAL units of the indicated type(s)
271
272 int nalu_length_field_size; // indicates the length in bytes of the NALUnitLenght field in EVC video stream sample in the stream
273 // The value of this field shall be one of 0, 1, or 3 corresponding to a length encoded with 1, 2, or 4 bytes, respectively.
274
275
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1 if (bytestream2_get_bytes_left(&gb) < 18) {
276 av_log(avctx, AV_LOG_ERROR, "evcC %d too short\n", size);
277 return AVERROR_INVALIDDATA;
278 }
279
280 1 bytestream2_skip(&gb, 16);
281
282 // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
283 // LengthSizeMinusOne plus 1 indicates the length in bytes of the NALUnitLength field in a EVC video stream sample in the stream to which this configuration record applies. For example, a size of one byte is indicated with a value of 0.
284 // The value of this field shall be one of 0, 1, or 3 corresponding to a length encoded with 1, 2, or 4 bytes, respectively.
285 1 nalu_length_field_size = (bytestream2_get_byte(&gb) & 3) + 1;
286
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1 if( nalu_length_field_size != 1 &&
287
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1 nalu_length_field_size != 2 &&
288 nalu_length_field_size != 4 ) {
289 av_log(avctx, AV_LOG_ERROR, "The length in bytes of the NALUnitLenght field in a EVC video stream has unsupported value of %d\n", nalu_length_field_size);
290 return AVERROR_INVALIDDATA;
291 }
292
293 1 num_of_arrays = bytestream2_get_byte(&gb);
294
295 /* Decode nal units from evcC. */
296
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4 for (int i = 0; i < num_of_arrays; i++) {
297
298 // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
299 // NAL_unit_type indicates the type of the NAL units in the following array (which shall be all of that type);
300 // - it takes a value as defined in ISO/IEC 23094-1;
301 // - it is restricted to take one of the values indicating a SPS, PPS, APS, or SEI NAL unit.
302 3 int nal_unit_type = bytestream2_get_byte(&gb) & 0x3f;
303 3 int num_nalus = bytestream2_get_be16(&gb);
304
305
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6 for (int j = 0; j < num_nalus; j++) {
306
307 3 int nal_unit_length = bytestream2_get_be16(&gb);
308
309
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3 if (bytestream2_get_bytes_left(&gb) < nal_unit_length) {
310 av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit size in extradata.\n");
311 return AVERROR_INVALIDDATA;
312 }
313
314
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3 if( nal_unit_type == EVC_SPS_NUT ||
315
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1 nal_unit_type == EVC_PPS_NUT ||
316
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1 nal_unit_type == EVC_APS_NUT ||
317 nal_unit_type == EVC_SEI_NUT ) {
318
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3 if (parse_nal_unit(s, avctx, gb.buffer, nal_unit_length) != 0) {
319 av_log(avctx, AV_LOG_ERROR, "Parsing of NAL unit failed\n");
320 return AVERROR_INVALIDDATA;
321 }
322 }
323
324 3 bytestream2_skip(&gb, nal_unit_length);
325 }
326 }
327 } else
328 return -1;
329
330 1 return ret;
331 }
332
333 602 static int evc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
334 const uint8_t **poutbuf, int *poutbuf_size,
335 const uint8_t *buf, int buf_size)
336 {
337 int next;
338 int ret;
339 602 EVCParserContext *ctx = s->priv_data;
340
341 602 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
342 602 s->key_frame = 0;
343
344
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602 if (avctx->extradata && !ctx->parsed_extradata) {
345 1 decode_extradata(s, avctx);
346 1 ctx->parsed_extradata = 1;
347 }
348
349 602 next = buf_size;
350
351 602 ret = parse_nal_units(s, avctx, buf, buf_size);
352
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602 if(ret < 0) {
353 *poutbuf = NULL;
354 *poutbuf_size = 0;
355 return buf_size;
356 }
357
358 // poutbuf contains just one Access Unit
359 602 *poutbuf = buf;
360 602 *poutbuf_size = buf_size;
361
362 602 return next;
363 }
364
365 2 static void evc_parser_close(AVCodecParserContext *s)
366 {
367 2 EVCParserContext *ctx = s->priv_data;
368
369 2 ff_evc_ps_free(&ctx->ps);
370 2 }
371
372 const AVCodecParser ff_evc_parser = {
373 .codec_ids = { AV_CODEC_ID_EVC },
374 .priv_data_size = sizeof(EVCParserContext),
375 .parser_parse = evc_parse,
376 .parser_close = evc_parser_close,
377 };
378