GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/dca_parser.c Lines: 139 183 76.0 %
Date: 2019-11-18 18:00:01 Branches: 93 140 66.4 %

Line Branch Exec Source
1
/*
2
 * DCA parser
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 * Copyright (C) 2004 Gildas Bazin
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 * Copyright (C) 2004 Benjamin Zores
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 * Copyright (C) 2006 Benjamin Larsson
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 * Copyright (C) 2007 Konstantin Shishkov
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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25
#include "dca.h"
26
#include "dca_core.h"
27
#include "dca_exss.h"
28
#include "dca_lbr.h"
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#include "dca_syncwords.h"
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#include "get_bits.h"
31
#include "parser.h"
32
33
typedef struct DCAParseContext {
34
    ParseContext pc;
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    uint32_t lastmarker;
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    int size;
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    int framesize;
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    unsigned int startpos;
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    DCAExssParser exss;
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    unsigned int sr_code;
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} DCAParseContext;
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43
#define IS_CORE_MARKER(state) \
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    (((state & 0xFFFFFFFFF0FF) == (((uint64_t)DCA_SYNCWORD_CORE_14B_LE << 16) | 0xF007)) || \
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     ((state & 0xFFFFFFFFFFF0) == (((uint64_t)DCA_SYNCWORD_CORE_14B_BE << 16) | 0x07F0)) || \
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     ((state & 0xFFFFFFFF00FC) == (((uint64_t)DCA_SYNCWORD_CORE_LE     << 16) | 0x00FC)) || \
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     ((state & 0xFFFFFFFFFC00) == (((uint64_t)DCA_SYNCWORD_CORE_BE     << 16) | 0xFC00)))
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#define IS_EXSS_MARKER(state)   ((state & 0xFFFFFFFF) == DCA_SYNCWORD_SUBSTREAM)
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51
#define IS_MARKER(state)        (IS_CORE_MARKER(state) || IS_EXSS_MARKER(state))
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53
#define CORE_MARKER(state)      ((state >> 16) & 0xFFFFFFFF)
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#define EXSS_MARKER(state)      (state & 0xFFFFFFFF)
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#define STATE_LE(state)     (((state & 0xFF00FF00) >> 8) | ((state & 0x00FF00FF) << 8))
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#define STATE_14(state)     (((state & 0x3FFF0000) >> 8) | ((state & 0x00003FFF) >> 6))
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#define CORE_FRAMESIZE(state)   (((state >> 4) & 0x3FFF) + 1)
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#define EXSS_FRAMESIZE(state)   ((state & 0x2000000000) ? \
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                                 ((state >>  5) & 0xFFFFF) + 1 : \
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                                 ((state >> 13) & 0x0FFFF) + 1)
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/**
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 * Find the end of the current frame in the bitstream.
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 * @return the position of the first byte of the next frame, or -1
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 */
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19845
static int dca_find_frame_end(DCAParseContext *pc1, const uint8_t *buf,
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                              int buf_size)
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{
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    int start_found, size, i;
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    uint64_t state;
73
19845
    ParseContext *pc = &pc1->pc;
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75
19845
    start_found = pc->frame_start_found;
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19845
    state       = pc->state64;
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19845
    size        = pc1->size;
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79
19845
    i = 0;
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19845
    if (!start_found) {
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23062
        for (; i < buf_size; i++) {
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23062
            size++;
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23062
            state = (state << 8) | buf[i];
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85


23062
            if (IS_MARKER(state) &&
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3854
                (!pc1->lastmarker ||
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3807
                  pc1->lastmarker == CORE_MARKER(state) ||
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6
                  pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM)) {
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3854
                if (!pc1->lastmarker)
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47
                    pc1->startpos = IS_EXSS_MARKER(state) ? size - 4 : size - 6;
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3854
                if (IS_EXSS_MARKER(state))
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9
                    pc1->lastmarker = EXSS_MARKER(state);
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                else
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3845
                    pc1->lastmarker = CORE_MARKER(state);
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3854
                start_found = 1;
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3854
                size        = 0;
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100
3854
                i++;
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3854
                break;
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            }
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        }
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    }
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106
19845
    if (start_found) {
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16572738
        for (; i < buf_size; i++) {
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16556700
            size++;
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16556700
            state = (state << 8) | buf[i];
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111
16556700
            if (start_found == 1) {
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7744
                switch (pc1->lastmarker) {
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7690
                case DCA_SYNCWORD_CORE_BE:
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7690
                    if (size == 2) {
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3845
                        pc1->framesize = CORE_FRAMESIZE(state);
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3845
                        start_found    = 2;
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                    }
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7690
                    break;
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                case DCA_SYNCWORD_CORE_LE:
120
                    if (size == 2) {
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                        pc1->framesize = CORE_FRAMESIZE(STATE_LE(state));
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                        start_found    = 4;
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                    }
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                    break;
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                case DCA_SYNCWORD_CORE_14B_BE:
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                    if (size == 4) {
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                        pc1->framesize = CORE_FRAMESIZE(STATE_14(state));
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                        start_found    = 4;
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                    }
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                    break;
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                case DCA_SYNCWORD_CORE_14B_LE:
132
                    if (size == 4) {
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                        pc1->framesize = CORE_FRAMESIZE(STATE_14(STATE_LE(state)));
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                        start_found    = 4;
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                    }
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                    break;
137
54
                case DCA_SYNCWORD_SUBSTREAM:
138
54
                    if (size == 6) {
139
9
                        pc1->framesize = EXSS_FRAMESIZE(state);
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9
                        start_found    = 4;
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                    }
142
54
                    break;
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                default:
144
                    av_assert0(0);
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                }
146
7744
                continue;
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            }
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149

16548956
            if (start_found == 2 && IS_EXSS_MARKER(state) &&
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2536
                pc1->framesize <= size + 2) {
151
2536
                pc1->framesize  = size + 2;
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2536
                start_found     = 3;
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2536
                continue;
154
            }
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156
16546420
            if (start_found == 3) {
157
15216
                if (size == pc1->framesize + 4) {
158
2536
                    pc1->framesize += EXSS_FRAMESIZE(state);
159
2536
                    start_found     = 4;
160
                }
161
15216
                continue;
162
            }
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164
16531204
            if (pc1->framesize > size)
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16527397
                continue;
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167


3807
            if (IS_MARKER(state) &&
168
3807
                (pc1->lastmarker == CORE_MARKER(state) ||
169
6
                 pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM)) {
170
3807
                pc->frame_start_found = 0;
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3807
                pc->state64           = -1;
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3807
                pc1->size             = 0;
173
3807
                return IS_EXSS_MARKER(state) ? i - 3 : i - 5;
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            }
175
        }
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    }
177
178
16038
    pc->frame_start_found = start_found;
179
16038
    pc->state64           = state;
180
16038
    pc1->size             = size;
181
16038
    return END_NOT_FOUND;
182
}
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184
48
static av_cold int dca_parse_init(AVCodecParserContext *s)
185
{
186
48
    DCAParseContext *pc1 = s->priv_data;
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188
48
    pc1->lastmarker = 0;
189
48
    pc1->sr_code = -1;
190
48
    return 0;
191
}
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193
4540
static int dca_parse_params(DCAParseContext *pc1, const uint8_t *buf,
194
                            int buf_size, int *duration, int *sample_rate,
195
                            int *profile)
196
{
197
4540
    DCAExssAsset *asset = &pc1->exss.assets[0];
198
    GetBitContext gb;
199
    DCACoreFrameHeader h;
200
4540
    uint8_t hdr[DCA_CORE_FRAME_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 };
201
    int ret, frame_size;
202
203
4540
    if (buf_size < DCA_CORE_FRAME_HEADER_SIZE)
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48
        return AVERROR_INVALIDDATA;
205
206
4492
    if (AV_RB32(buf) == DCA_SYNCWORD_SUBSTREAM) {
207
9
        if ((ret = ff_dca_exss_parse(&pc1->exss, buf, buf_size)) < 0)
208
            return ret;
209
210
9
        if (asset->extension_mask & DCA_EXSS_LBR) {
211
            if ((ret = init_get_bits8(&gb, buf + asset->lbr_offset, asset->lbr_size)) < 0)
212
                return ret;
213
214
            if (get_bits_long(&gb, 32) != DCA_SYNCWORD_LBR)
215
                return AVERROR_INVALIDDATA;
216
217
            switch (get_bits(&gb, 8)) {
218
            case DCA_LBR_HEADER_DECODER_INIT:
219
                pc1->sr_code = get_bits(&gb, 8);
220
            case DCA_LBR_HEADER_SYNC_ONLY:
221
                break;
222
            default:
223
                return AVERROR_INVALIDDATA;
224
            }
225
226
            if (pc1->sr_code >= FF_ARRAY_ELEMS(ff_dca_sampling_freqs))
227
                return AVERROR_INVALIDDATA;
228
229
            *sample_rate = ff_dca_sampling_freqs[pc1->sr_code];
230
            *duration = 1024 << ff_dca_freq_ranges[pc1->sr_code];
231
            *profile = FF_PROFILE_DTS_EXPRESS;
232
            return 0;
233
        }
234
235
9
        if (asset->extension_mask & DCA_EXSS_XLL) {
236
            int nsamples_log2;
237
238
9
            if ((ret = init_get_bits8(&gb, buf + asset->xll_offset, asset->xll_size)) < 0)
239
                return ret;
240
241
9
            if (get_bits_long(&gb, 32) != DCA_SYNCWORD_XLL)
242
                return AVERROR_INVALIDDATA;
243
244
9
            if (get_bits(&gb, 4))
245
                return AVERROR_INVALIDDATA;
246
247
9
            skip_bits(&gb, 8);
248
9
            skip_bits_long(&gb, get_bits(&gb, 5) + 1);
249
9
            skip_bits(&gb, 4);
250
9
            nsamples_log2 = get_bits(&gb, 4) + get_bits(&gb, 4);
251
9
            if (nsamples_log2 > 24)
252
                return AVERROR_INVALIDDATA;
253
254
9
            *sample_rate = asset->max_sample_rate;
255
9
            *duration = (1 + (*sample_rate > 96000)) << nsamples_log2;
256
9
            *profile = FF_PROFILE_DTS_HD_MA;
257
9
            return 0;
258
        }
259
260
        return AVERROR_INVALIDDATA;
261
    }
262
263
4483
    if ((ret = avpriv_dca_convert_bitstream(buf, DCA_CORE_FRAME_HEADER_SIZE,
264
                                            hdr, DCA_CORE_FRAME_HEADER_SIZE)) < 0)
265
        return ret;
266
4483
    if (avpriv_dca_parse_core_frame_header(&h, hdr, ret) < 0)
267
        return AVERROR_INVALIDDATA;
268
269
4483
    *duration = h.npcmblocks * DCA_PCMBLOCK_SAMPLES;
270
4483
    *sample_rate = avpriv_dca_sample_rates[h.sr_code];
271
4483
    if (*profile != FF_PROFILE_UNKNOWN)
272
4439
        return 0;
273
274
44
    *profile = FF_PROFILE_DTS;
275
44
    if (h.ext_audio_present) {
276
12
        switch (h.ext_audio_type) {
277
8
        case DCA_EXT_AUDIO_XCH:
278
        case DCA_EXT_AUDIO_XXCH:
279
8
            *profile = FF_PROFILE_DTS_ES;
280
8
            break;
281
4
        case DCA_EXT_AUDIO_X96:
282
4
            *profile = FF_PROFILE_DTS_96_24;
283
4
            break;
284
        }
285
32
    }
286
287
44
    frame_size = FFALIGN(h.frame_size, 4);
288
44
    if (buf_size - 4 < frame_size)
289
10
        return 0;
290
291
34
    buf      += frame_size;
292
34
    buf_size -= frame_size;
293
34
    if (AV_RB32(buf) != DCA_SYNCWORD_SUBSTREAM)
294
        return 0;
295
34
    if (ff_dca_exss_parse(&pc1->exss, buf, buf_size) < 0)
296
        return 0;
297
298
34
    if (asset->extension_mask & DCA_EXSS_XLL)
299
26
        *profile = FF_PROFILE_DTS_HD_MA;
300
8
    else if (asset->extension_mask & (DCA_EXSS_XBR | DCA_EXSS_XXCH | DCA_EXSS_X96))
301
8
        *profile = FF_PROFILE_DTS_HD_HRA;
302
303
34
    return 0;
304
}
305
306
20484
static int dca_parse(AVCodecParserContext *s, AVCodecContext *avctx,
307
                     const uint8_t **poutbuf, int *poutbuf_size,
308
                     const uint8_t *buf, int buf_size)
309
{
310
20484
    DCAParseContext *pc1 = s->priv_data;
311
20484
    ParseContext *pc = &pc1->pc;
312
    int next, duration, sample_rate;
313
314
20484
    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
315
639
        next = buf_size;
316
    } else {
317
19845
        next = dca_find_frame_end(pc1, buf, buf_size);
318
319
19845
        if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
320
15944
            *poutbuf      = NULL;
321
15944
            *poutbuf_size = 0;
322
15944
            return buf_size;
323
        }
324
325
        /* skip initial padding */
326
3901
        if (buf_size  > pc1->startpos) {
327
3854
            buf      += pc1->startpos;
328
3854
            buf_size -= pc1->startpos;
329
        }
330
3901
        pc1->startpos = 0;
331
    }
332
333
    /* read the duration and sample rate from the frame header */
334
4540
    if (!dca_parse_params(pc1, buf, buf_size, &duration, &sample_rate, &avctx->profile)) {
335
4492
        if (!avctx->sample_rate)
336
5
            avctx->sample_rate = sample_rate;
337
4492
        s->duration = av_rescale(duration, avctx->sample_rate, sample_rate);
338
    } else
339
48
        s->duration = 0;
340
341
4540
    *poutbuf      = buf;
342
4540
    *poutbuf_size = buf_size;
343
4540
    return next;
344
}
345
346
AVCodecParser ff_dca_parser = {
347
    .codec_ids      = { AV_CODEC_ID_DTS },
348
    .priv_data_size = sizeof(DCAParseContext),
349
    .parser_init    = dca_parse_init,
350
    .parser_parse   = dca_parse,
351
    .parser_close   = ff_parse_close,
352
};