GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/hevc_parser.c Lines: 147 189 77.8 %
Date: 2019-11-22 03:34:36 Branches: 93 142 65.5 %

Line Branch Exec Source
1
/*
2
 * HEVC Annex B format parser
3
 *
4
 * Copyright (C) 2012 - 2013 Guillaume Martres
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 "libavutil/common.h"
24
25
#include "golomb.h"
26
#include "hevc.h"
27
#include "hevc_parse.h"
28
#include "hevc_ps.h"
29
#include "hevc_sei.h"
30
#include "h2645_parse.h"
31
#include "internal.h"
32
#include "parser.h"
33
34
#define START_CODE 0x000001 ///< start_code_prefix_one_3bytes
35
36
#define IS_IRAP_NAL(nal) (nal->type >= 16 && nal->type <= 23)
37
#define IS_IDR_NAL(nal) (nal->type == HEVC_NAL_IDR_W_RADL || nal->type == HEVC_NAL_IDR_N_LP)
38
39
typedef struct HEVCParserContext {
40
    ParseContext pc;
41
42
    H2645Packet pkt;
43
    HEVCParamSets ps;
44
    HEVCSEI sei;
45
    SliceHeader sh;
46
47
    int is_avc;
48
    int nal_length_size;
49
    int parsed_extradata;
50
51
    int poc;
52
    int pocTid0;
53
} HEVCParserContext;
54
55
11453
static int hevc_parse_slice_header(AVCodecParserContext *s, H2645NAL *nal,
56
                                   AVCodecContext *avctx)
57
{
58
11453
    HEVCParserContext *ctx = s->priv_data;
59
11453
    HEVCParamSets *ps = &ctx->ps;
60
11453
    HEVCSEI *sei = &ctx->sei;
61
11453
    SliceHeader *sh = &ctx->sh;
62
11453
    GetBitContext *gb = &nal->gb;
63
    const HEVCWindow *ow;
64
11453
    int i, num = 0, den = 0;
65
66
11453
    sh->first_slice_in_pic_flag = get_bits1(gb);
67
11453
    s->picture_structure = sei->picture_timing.picture_struct;
68
11453
    s->field_order = sei->picture_timing.picture_struct;
69
70

11453
    if (IS_IRAP_NAL(nal)) {
71
378
        s->key_frame = 1;
72
378
        sh->no_output_of_prior_pics_flag = get_bits1(gb);
73
    }
74
75
11453
    sh->pps_id = get_ue_golomb(gb);
76

11453
    if (sh->pps_id >= HEVC_MAX_PPS_COUNT || !ps->pps_list[sh->pps_id]) {
77
22
        av_log(avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", sh->pps_id);
78
22
        return AVERROR_INVALIDDATA;
79
    }
80
11431
    ps->pps = (HEVCPPS*)ps->pps_list[sh->pps_id]->data;
81
82

11431
    if (ps->pps->sps_id >= HEVC_MAX_SPS_COUNT || !ps->sps_list[ps->pps->sps_id]) {
83
        av_log(avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", ps->pps->sps_id);
84
        return AVERROR_INVALIDDATA;
85
    }
86
11431
    if (ps->sps != (HEVCSPS*)ps->sps_list[ps->pps->sps_id]->data) {
87
196
        ps->sps = (HEVCSPS*)ps->sps_list[ps->pps->sps_id]->data;
88
196
        ps->vps = (HEVCVPS*)ps->vps_list[ps->sps->vps_id]->data;
89
    }
90
11431
    ow  = &ps->sps->output_window;
91
92
11431
    s->coded_width  = ps->sps->width;
93
11431
    s->coded_height = ps->sps->height;
94
11431
    s->width        = ps->sps->width  - ow->left_offset - ow->right_offset;
95
11431
    s->height       = ps->sps->height - ow->top_offset  - ow->bottom_offset;
96
11431
    s->format       = ps->sps->pix_fmt;
97
11431
    avctx->profile  = ps->sps->ptl.general_ptl.profile_idc;
98
11431
    avctx->level    = ps->sps->ptl.general_ptl.level_idc;
99
100
11431
    if (ps->vps->vps_timing_info_present_flag) {
101
340
        num = ps->vps->vps_num_units_in_tick;
102
340
        den = ps->vps->vps_time_scale;
103
11091
    } else if (ps->sps->vui.vui_timing_info_present_flag) {
104
307
        num = ps->sps->vui.vui_num_units_in_tick;
105
307
        den = ps->sps->vui.vui_time_scale;
106
    }
107
108

11431
    if (num != 0 && den != 0)
109
647
        av_reduce(&avctx->framerate.den, &avctx->framerate.num,
110
                  num, den, 1 << 30);
111
112
11431
    if (!sh->first_slice_in_pic_flag) {
113
        int slice_address_length;
114
115
        if (ps->pps->dependent_slice_segments_enabled_flag)
116
            sh->dependent_slice_segment_flag = get_bits1(gb);
117
        else
118
            sh->dependent_slice_segment_flag = 0;
119
120
        slice_address_length = av_ceil_log2_c(ps->sps->ctb_width *
121
                                              ps->sps->ctb_height);
122
        sh->slice_segment_addr = get_bitsz(gb, slice_address_length);
123
        if (sh->slice_segment_addr >= ps->sps->ctb_width * ps->sps->ctb_height) {
124
            av_log(avctx, AV_LOG_ERROR, "Invalid slice segment address: %u.\n",
125
                   sh->slice_segment_addr);
126
            return AVERROR_INVALIDDATA;
127
        }
128
    } else
129
11431
        sh->dependent_slice_segment_flag = 0;
130
131
11431
    if (sh->dependent_slice_segment_flag)
132
        return 0; /* break; */
133
134
11434
    for (i = 0; i < ps->pps->num_extra_slice_header_bits; i++)
135
3
        skip_bits(gb, 1); // slice_reserved_undetermined_flag[]
136
137
11431
    sh->slice_type = get_ue_golomb(gb);
138

11431
    if (!(sh->slice_type == HEVC_SLICE_I || sh->slice_type == HEVC_SLICE_P ||
139
8317
          sh->slice_type == HEVC_SLICE_B)) {
140
        av_log(avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
141
               sh->slice_type);
142
        return AVERROR_INVALIDDATA;
143
    }
144
14545
    s->pict_type = sh->slice_type == HEVC_SLICE_B ? AV_PICTURE_TYPE_B :
145
3114
                   sh->slice_type == HEVC_SLICE_P ? AV_PICTURE_TYPE_P :
146
                                               AV_PICTURE_TYPE_I;
147
148
11431
    if (ps->pps->output_flag_present_flag)
149
700
        sh->pic_output_flag = get_bits1(gb);
150
151
11431
    if (ps->sps->separate_colour_plane_flag)
152
        sh->colour_plane_id = get_bits(gb, 2);
153
154

11431
    if (!IS_IDR_NAL(nal)) {
155
11231
        sh->pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
156
11231
        s->output_picture_number = ctx->poc = ff_hevc_compute_poc(ps->sps, ctx->pocTid0, sh->pic_order_cnt_lsb, nal->type);
157
    } else
158
200
        s->output_picture_number = ctx->poc = 0;
159
160
11431
    if (nal->temporal_id == 0 &&
161
11068
        nal->type != HEVC_NAL_TRAIL_N &&
162
8124
        nal->type != HEVC_NAL_TSA_N &&
163
8124
        nal->type != HEVC_NAL_STSA_N &&
164
8124
        nal->type != HEVC_NAL_RADL_N &&
165
8092
        nal->type != HEVC_NAL_RASL_N &&
166
7690
        nal->type != HEVC_NAL_RADL_R &&
167
7662
        nal->type != HEVC_NAL_RASL_R)
168
7057
        ctx->pocTid0 = ctx->poc;
169
170
11431
    return 1; /* no need to evaluate the rest */
171
}
172
173
/**
174
 * Parse NAL units of found picture and decode some basic information.
175
 *
176
 * @param s parser context.
177
 * @param avctx codec context.
178
 * @param buf buffer with field/frame data.
179
 * @param buf_size size of the buffer.
180
 */
181
11454
static int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
182
                           int buf_size, AVCodecContext *avctx)
183
{
184
11454
    HEVCParserContext *ctx = s->priv_data;
185
11454
    HEVCParamSets *ps = &ctx->ps;
186
11454
    HEVCSEI *sei = &ctx->sei;
187
    int ret, i;
188
189
    /* set some sane default values */
190
11454
    s->pict_type         = AV_PICTURE_TYPE_I;
191
11454
    s->key_frame         = 0;
192
11454
    s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
193
194
11454
    ff_hevc_reset_sei(sei);
195
196
11454
    ret = ff_h2645_packet_split(&ctx->pkt, buf, buf_size, avctx, ctx->is_avc,
197
                                ctx->nal_length_size, AV_CODEC_ID_HEVC, 1, 0);
198
11454
    if (ret < 0)
199
        return ret;
200
201
14673
    for (i = 0; i < ctx->pkt.nb_nals; i++) {
202
14672
        H2645NAL *nal = &ctx->pkt.nals[i];
203
14672
        GetBitContext *gb = &nal->gb;
204
205

14672
        switch (nal->type) {
206
224
        case HEVC_NAL_VPS:
207
224
            ff_hevc_decode_nal_vps(gb, avctx, ps);
208
224
            break;
209
223
        case HEVC_NAL_SPS:
210
223
            ff_hevc_decode_nal_sps(gb, avctx, ps, 1);
211
223
            break;
212
1346
        case HEVC_NAL_PPS:
213
1346
            ff_hevc_decode_nal_pps(gb, avctx, ps);
214
1346
            break;
215
796
        case HEVC_NAL_SEI_PREFIX:
216
        case HEVC_NAL_SEI_SUFFIX:
217
796
            ff_hevc_decode_nal_sei(gb, avctx, sei, ps, nal->type);
218
796
            break;
219
11453
        case HEVC_NAL_TRAIL_N:
220
        case HEVC_NAL_TRAIL_R:
221
        case HEVC_NAL_TSA_N:
222
        case HEVC_NAL_TSA_R:
223
        case HEVC_NAL_STSA_N:
224
        case HEVC_NAL_STSA_R:
225
        case HEVC_NAL_BLA_W_LP:
226
        case HEVC_NAL_BLA_W_RADL:
227
        case HEVC_NAL_BLA_N_LP:
228
        case HEVC_NAL_IDR_W_RADL:
229
        case HEVC_NAL_IDR_N_LP:
230
        case HEVC_NAL_CRA_NUT:
231
        case HEVC_NAL_RADL_N:
232
        case HEVC_NAL_RADL_R:
233
        case HEVC_NAL_RASL_N:
234
        case HEVC_NAL_RASL_R:
235
11453
            ret = hevc_parse_slice_header(s, nal, avctx);
236
11453
            if (ret)
237
11453
                return ret;
238
            break;
239
        }
240
3219
    }
241
    /* didn't find a picture! */
242
1
    av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
243
1
    return -1;
244
}
245
246
/**
247
 * Find the end of the current frame in the bitstream.
248
 * @return the position of the first byte of the next frame, or END_NOT_FOUND
249
 */
250
86894
static int hevc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
251
                               int buf_size)
252
{
253
86894
    HEVCParserContext *ctx = s->priv_data;
254
86894
    ParseContext       *pc = &ctx->pc;
255
    int i;
256
257
77215362
    for (i = 0; i < buf_size; i++) {
258
        int nut;
259
260
77139734
        pc->state64 = (pc->state64 << 8) | buf[i];
261
262
77139734
        if (((pc->state64 >> 3 * 8) & 0xFFFFFF) != START_CODE)
263
77083907
            continue;
264
265
55827
        nut = (pc->state64 >> 2 * 8 + 1) & 0x3F;
266
        // Beginning of access unit
267


55827
        if ((nut >= HEVC_NAL_VPS && nut <= HEVC_NAL_EOB_NUT) || nut == HEVC_NAL_SEI_PREFIX ||
268

50983
            (nut >= 41 && nut <= 44) || (nut >= 48 && nut <= 55)) {
269
4844
            if (pc->frame_start_found) {
270
1626
                pc->frame_start_found = 0;
271
1626
                return i - 5;
272
            }
273

50983
        } else if (nut <= HEVC_NAL_RASL_R ||
274
9209
                   (nut >= HEVC_NAL_BLA_W_LP && nut <= HEVC_NAL_CRA_NUT)) {
275
42792
            int first_slice_segment_in_pic_flag = buf[i] >> 7;
276
42792
            if (first_slice_segment_in_pic_flag) {
277
21093
                if (!pc->frame_start_found) {
278
11453
                    pc->frame_start_found = 1;
279
                } else { // First slice of next frame found
280
9640
                    pc->frame_start_found = 0;
281
9640
                    return i - 5;
282
                }
283
            }
284
        }
285
    }
286
287
75628
    return END_NOT_FOUND;
288
}
289
290
86894
static int hevc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
291
                      const uint8_t **poutbuf, int *poutbuf_size,
292
                      const uint8_t *buf, int buf_size)
293
{
294
    int next;
295
86894
    HEVCParserContext *ctx = s->priv_data;
296
86894
    ParseContext *pc = &ctx->pc;
297
86894
    int is_dummy_buf = !buf_size;
298
86894
    const uint8_t *dummy_buf = buf;
299
300

86894
    if (avctx->extradata && !ctx->parsed_extradata) {
301
178
        ff_hevc_decode_extradata(avctx->extradata, avctx->extradata_size, &ctx->ps, &ctx->sei,
302
                                 &ctx->is_avc, &ctx->nal_length_size, avctx->err_recognition,
303
                                 1, avctx);
304
178
        ctx->parsed_extradata = 1;
305
    }
306
307
86894
    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
308
        next = buf_size;
309
    } else {
310
86894
        next = hevc_find_frame_end(s, buf, buf_size);
311
86894
        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
312
75252
            *poutbuf      = NULL;
313
75252
            *poutbuf_size = 0;
314
75252
            return buf_size;
315
        }
316
    }
317
318
11642
    is_dummy_buf &= (dummy_buf == buf);
319
320
11642
    if (!is_dummy_buf)
321
11454
        parse_nal_units(s, buf, buf_size, avctx);
322
323
11642
    *poutbuf      = buf;
324
11642
    *poutbuf_size = buf_size;
325
11642
    return next;
326
}
327
328
// Split after the parameter sets at the beginning of the stream if they exist.
329
static int hevc_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
330
{
331
    const uint8_t *ptr = buf, *end = buf + buf_size;
332
    uint32_t state = -1;
333
    int has_vps = 0;
334
    int has_sps = 0;
335
    int has_pps = 0;
336
    int nut;
337
338
    while (ptr < end) {
339
        ptr = avpriv_find_start_code(ptr, end, &state);
340
        if ((state >> 8) != START_CODE)
341
            break;
342
        nut = (state >> 1) & 0x3F;
343
        if (nut == HEVC_NAL_VPS)
344
            has_vps = 1;
345
        else if (nut == HEVC_NAL_SPS)
346
            has_sps = 1;
347
        else if (nut == HEVC_NAL_PPS)
348
            has_pps = 1;
349
        else if ((nut != HEVC_NAL_SEI_PREFIX || has_pps) &&
350
                  nut != HEVC_NAL_AUD) {
351
            if (has_vps && has_sps) {
352
                while (ptr - 4 > buf && ptr[-5] == 0)
353
                    ptr--;
354
                return ptr - 4 - buf;
355
            }
356
        }
357
    }
358
    return 0;
359
}
360
361
193
static void hevc_parser_close(AVCodecParserContext *s)
362
{
363
193
    HEVCParserContext *ctx = s->priv_data;
364
365
193
    ff_hevc_ps_uninit(&ctx->ps);
366
193
    ff_h2645_packet_uninit(&ctx->pkt);
367
193
    ff_hevc_reset_sei(&ctx->sei);
368
369
193
    av_freep(&ctx->pc.buffer);
370
193
}
371
372
AVCodecParser ff_hevc_parser = {
373
    .codec_ids      = { AV_CODEC_ID_HEVC },
374
    .priv_data_size = sizeof(HEVCParserContext),
375
    .parser_parse   = hevc_parse,
376
    .parser_close   = hevc_parser_close,
377
    .split          = hevc_split,
378
};