FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/mlp_parser.c	Lines:	71	89	79.8 %
Date:	2021-04-18 10:33:33	Branches:	47	64	73.4 %


/*
 * MLP parser
 * Copyright (c) 2007 Ian Caulfield
 *
 * 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
 */

/**
 * @file
 * MLP parser
 */

#include <stdint.h>

#include "libavutil/internal.h"
#include "get_bits.h"
#include "parser.h"
#include "mlp_parse.h"
#include "mlp.h"

typedef struct MLPParseContext
{
    ParseContext pc;

    int bytes_left;

    int in_sync;

    int num_substreams;
} MLPParseContext;

static av_cold int mlp_init(AVCodecParserContext *s)
{
    ff_mlp_init_crc();
    return 0;
}

static int mlp_parse(AVCodecParserContext *s,
                     AVCodecContext *avctx,
                     const uint8_t **poutbuf, int *poutbuf_size,
                     const uint8_t *buf, int buf_size)
{
    MLPParseContext *mp = s->priv_data;
    int sync_present;
    uint8_t parity_bits;
    int next;
    int ret;
    int i, p = 0;

    s->key_frame = 0;

    *poutbuf_size = 0;
    *poutbuf = NULL;
    if (buf_size == 0)
        return 0;

    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
        next = buf_size;
    } else {
        if (!mp->in_sync) {
            // Not in sync - find a major sync header

            for (i = 0; i < buf_size; i++) {
                mp->pc.state = (mp->pc.state << 8) | buf[i];
                if ((mp->pc.state & 0xfffffffe) == 0xf8726fba &&
                    // ignore if we do not have the data for the start of header
                    mp->pc.index + i >= 7) {
                    mp->in_sync = 1;
                    mp->bytes_left = 0;
                    break;
                }
            }

            if (!mp->in_sync) {
                if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1)
                    av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
                return buf_size;
            }

            if ((ret = ff_combine_frame(&mp->pc, i - 7, &buf, &buf_size)) < 0) {
                av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
                return ret;
            }

            return i - 7;
        }

        if (mp->bytes_left == 0) {
            // Find length of this packet

            /* Copy overread bytes from last frame into buffer. */
            for(; mp->pc.overread>0; mp->pc.overread--) {
                mp->pc.buffer[mp->pc.index++]= mp->pc.buffer[mp->pc.overread_index++];
            }

            if (mp->pc.index + buf_size < 2) {
                if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1)
                    av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
                return buf_size;
            }

            mp->bytes_left = ((mp->pc.index > 0 ? mp->pc.buffer[0] : buf[0]) << 8)
                           |  (mp->pc.index > 1 ? mp->pc.buffer[1] : buf[1-mp->pc.index]);
            mp->bytes_left = (mp->bytes_left & 0xfff) * 2;
            if (mp->bytes_left <= 0) { // prevent infinite loop
                goto lost_sync;
            }
            mp->bytes_left -= mp->pc.index;
        }

        next = (mp->bytes_left > buf_size) ? END_NOT_FOUND : mp->bytes_left;

        if (ff_combine_frame(&mp->pc, next, &buf, &buf_size) < 0) {
            mp->bytes_left -= buf_size;
            return buf_size;
        }

        mp->bytes_left = 0;
    }

    sync_present = buf_size >= 8 && (AV_RB32(buf + 4) & 0xfffffffe) == 0xf8726fba;

    if (!sync_present) {
        /* The first nibble of a frame is a parity check of the 4-byte
         * access unit header and all the 2- or 4-byte substream headers. */
        // Only check when this isn't a sync frame - syncs have a checksum.

        s->key_frame = 0;

        parity_bits = 0;
        for (i = -1; i < mp->num_substreams; i++) {
            parity_bits ^= buf[p++];
            parity_bits ^= buf[p++];

            if (i < 0 || buf[p-2] & 0x80) {
                parity_bits ^= buf[p++];
                parity_bits ^= buf[p++];
            }
        }

        if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
            av_log(avctx, AV_LOG_INFO, "mlpparse: Parity check failed.\n");
            goto lost_sync;
        }
    } else {
        GetBitContext gb;
        MLPHeaderInfo mh;

        init_get_bits(&gb, buf + 4, (buf_size - 4) << 3);
        if (ff_mlp_read_major_sync(avctx, &mh, &gb) < 0)
            goto lost_sync;

        s->key_frame = 1;

        avctx->bits_per_raw_sample = mh.group1_bits;
        if (avctx->bits_per_raw_sample > 16)
            avctx->sample_fmt = AV_SAMPLE_FMT_S32;
        else
            avctx->sample_fmt = AV_SAMPLE_FMT_S16;
        avctx->sample_rate = mh.group1_samplerate;
        avctx->frame_size =
        s->duration = mh.access_unit_size;

        if(!avctx->channels || !avctx->channel_layout) {
        if (mh.stream_type == 0xbb) {
            /* MLP stream */
            avctx->channels       = mh.channels_mlp;
            avctx->channel_layout = mh.channel_layout_mlp;
        } else { /* mh.stream_type == 0xba */
            /* TrueHD stream */
            if (!mh.channels_thd_stream2) {
                avctx->channels       = mh.channels_thd_stream1;
                avctx->channel_layout = mh.channel_layout_thd_stream1;
            } else {
                avctx->channels       = mh.channels_thd_stream2;
                avctx->channel_layout = mh.channel_layout_thd_stream2;
            }
        }
        }

        if (!mh.is_vbr) /* Stream is CBR */
            avctx->bit_rate = mh.peak_bitrate;

        mp->num_substreams = mh.num_substreams;
    }

    *poutbuf = buf;
    *poutbuf_size = buf_size;

    return next;

lost_sync:
    mp->in_sync = 0;
    return 1;
}

AVCodecParser ff_mlp_parser = {
    .codec_ids      = { AV_CODEC_ID_MLP, AV_CODEC_ID_TRUEHD },
    .priv_data_size = sizeof(MLPParseContext),
    .parser_init    = mlp_init,
    .parser_parse   = mlp_parse,
    .parser_close   = ff_parse_close,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* MLP parser
3			* Copyright (c) 2007 Ian Caulfield
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* MLP parser
25			*/
26
27			#include <stdint.h>
28
29			#include "libavutil/internal.h"
30			#include "get_bits.h"
31			#include "parser.h"
32			#include "mlp_parse.h"
33			#include "mlp.h"
34
35			typedef struct MLPParseContext
36			{
37			ParseContext pc;
38
39			int bytes_left;
40
41			int in_sync;
42
43			int num_substreams;
44			} MLPParseContext;
45
46		4	static av_cold int mlp_init(AVCodecParserContext *s)
47			{
48		4	ff_mlp_init_crc();
49		4	return 0;
50			}
51
52		18263	static int mlp_parse(AVCodecParserContext *s,
53			AVCodecContext *avctx,
54			const uint8_t *poutbuf, int poutbuf_size,
55			const uint8_t *buf, int buf_size)
56			{
57		18263	MLPParseContext *mp = s->priv_data;
58			int sync_present;
59			uint8_t parity_bits;
60			int next;
61			int ret;
62		18263	int i, p = 0;
63
64		18263	s->key_frame = 0;
65
66		18263	*poutbuf_size = 0;
67		18263	*poutbuf = NULL;
68	✓✓	18263	if (buf_size == 0)
69		4	return 0;
70
71	✗✓	18259	if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
72			next = buf_size;
73			} else {
74	✓✓	18259	if (!mp->in_sync) {
75			// Not in sync - find a major sync header
76
77	✓✓	4752	for (i = 0; i < buf_size; i++) {
78		4748	mp->pc.state = (mp->pc.state << 8) \| buf[i];
79	✓✓	4748	if ((mp->pc.state & 0xfffffffe) == 0xf8726fba &&
80			// ignore if we do not have the data for the start of header
81	✓✗	4	mp->pc.index + i >= 7) {
82		4	mp->in_sync = 1;
83		4	mp->bytes_left = 0;
84		4	break;
85			}
86			}
87
88	✓✓	8	if (!mp->in_sync) {
89	✗✓	4	if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1)
90			av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
91		4	return buf_size;
92			}
93
94	✗✓	4	if ((ret = ff_combine_frame(&mp->pc, i - 7, &buf, &buf_size)) < 0) {
95			av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
96			return ret;
97			}
98
99		4	return i - 7;
100			}
101
102	✓✓	18251	if (mp->bytes_left == 0) {
103			// Find length of this packet
104
105			/* Copy overread bytes from last frame into buffer. */
106	✗✓	15918	for(; mp->pc.overread>0; mp->pc.overread--) {
107			mp->pc.buffer[mp->pc.index++]= mp->pc.buffer[mp->pc.overread_index++];
108			}
109
110	✗✓	15918	if (mp->pc.index + buf_size < 2) {
111			if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1)
112			av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
113			return buf_size;
114			}
115
116	✗✓	15918	mp->bytes_left = ((mp->pc.index > 0 ? mp->pc.buffer[0] : buf[0]) << 8)
117	✗✓	15918	\| (mp->pc.index > 1 ? mp->pc.buffer[1] : buf[1-mp->pc.index]);
118		15918	mp->bytes_left = (mp->bytes_left & 0xfff) * 2;
119	✗✓	15918	if (mp->bytes_left <= 0) { // prevent infinite loop
120			goto lost_sync;
121			}
122		15918	mp->bytes_left -= mp->pc.index;
123			}
124
125	✓✓	18251	next = (mp->bytes_left > buf_size) ? END_NOT_FOUND : mp->bytes_left;
126
127	✓✓	18251	if (ff_combine_frame(&mp->pc, next, &buf, &buf_size) < 0) {
128		2336	mp->bytes_left -= buf_size;
129		2336	return buf_size;
130			}
131
132		15915	mp->bytes_left = 0;
133			}
134
135	✓✗✓✓	15915	sync_present = buf_size >= 8 && (AV_RB32(buf + 4) & 0xfffffffe) == 0xf8726fba;
136
137	✓✓	15915	if (!sync_present) {
138			/* The first nibble of a frame is a parity check of the 4-byte
139			* access unit header and all the 2- or 4-byte substream headers. */
140			// Only check when this isn't a sync frame - syncs have a checksum.
141
142		14371	s->key_frame = 0;
143
144		14371	parity_bits = 0;
145	✓✓	49886	for (i = -1; i < mp->num_substreams; i++) {
146		35515	parity_bits ^= buf[p++];
147		35515	parity_bits ^= buf[p++];
148
149	✓✓✓✓	35515	if (i < 0 \|\| buf[p-2] & 0x80) {
150		14479	parity_bits ^= buf[p++];
151		14479	parity_bits ^= buf[p++];
152			}
153			}
154
155	✗✓	14371	if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
156			av_log(avctx, AV_LOG_INFO, "mlpparse: Parity check failed.\n");
157			goto lost_sync;
158			}
159			} else {
160			GetBitContext gb;
161			MLPHeaderInfo mh;
162
163		1544	init_get_bits(&gb, buf + 4, (buf_size - 4) << 3);
164	✗✓	1544	if (ff_mlp_read_major_sync(avctx, &mh, &gb) < 0)
165			goto lost_sync;
166
167		1544	s->key_frame = 1;
168
169		1544	avctx->bits_per_raw_sample = mh.group1_bits;
170	✓✓	1544	if (avctx->bits_per_raw_sample > 16)
171		429	avctx->sample_fmt = AV_SAMPLE_FMT_S32;
172			else
173		1115	avctx->sample_fmt = AV_SAMPLE_FMT_S16;
174		1544	avctx->sample_rate = mh.group1_samplerate;
175		1544	avctx->frame_size =
176		1544	s->duration = mh.access_unit_size;
177
178	✓✓✗✓	1544	if(!avctx->channels \|\| !avctx->channel_layout) {
179	✓✓	4	if (mh.stream_type == 0xbb) {
180			/* MLP stream */
181		1	avctx->channels = mh.channels_mlp;
182		1	avctx->channel_layout = mh.channel_layout_mlp;
183			} else { /* mh.stream_type == 0xba */
184			/* TrueHD stream */
185	✗✓	3	if (!mh.channels_thd_stream2) {
186			avctx->channels = mh.channels_thd_stream1;
187			avctx->channel_layout = mh.channel_layout_thd_stream1;
188			} else {
189		3	avctx->channels = mh.channels_thd_stream2;
190		3	avctx->channel_layout = mh.channel_layout_thd_stream2;
191			}
192			}
193			}
194
195	✗✓	1544	if (!mh.is_vbr) /* Stream is CBR */
196			avctx->bit_rate = mh.peak_bitrate;
197
198		1544	mp->num_substreams = mh.num_substreams;
199			}
200
201		15915	*poutbuf = buf;
202		15915	*poutbuf_size = buf_size;
203
204		15915	return next;
205
206			lost_sync:
207			mp->in_sync = 0;
208			return 1;
209			}
210
211			AVCodecParser ff_mlp_parser = {
212			.codec_ids = { AV_CODEC_ID_MLP, AV_CODEC_ID_TRUEHD },
213			.priv_data_size = sizeof(MLPParseContext),
214			.parser_init = mlp_init,
215			.parser_parse = mlp_parse,
216			.parser_close = ff_parse_close,
217			};