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GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/mlp_parser.c	Lines:	70	88	79.5 %
Date:	2020-01-27 20:17:04	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;
    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 4.1)

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		3	static av_cold int mlp_init(AVCodecParserContext *s)
47			{
48		3	ff_mlp_init_crc();
49		3	return 0;
50			}
51
52		18076	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		18076	MLPParseContext *mp = s->priv_data;
58			int sync_present;
59			uint8_t parity_bits;
60			int next;
61			int ret;
62		18076	int i, p = 0;
63
64		18076	s->key_frame = 0;
65
66		18076	*poutbuf_size = 0;
67	✓✓	18076	if (buf_size == 0)
68		3	return 0;
69
70	✗✓	18073	if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
71			next = buf_size;
72			} else {
73	✓✓	18073	if (!mp->in_sync) {
74			// Not in sync - find a major sync header
75
76	✓✓	4744	for (i = 0; i < buf_size; i++) {
77		4740	mp->pc.state = (mp->pc.state << 8) \| buf[i];
78	✓✓	4740	if ((mp->pc.state & 0xfffffffe) == 0xf8726fba &&
79			// ignore if we do not have the data for the start of header
80	✓✗	3	mp->pc.index + i >= 7) {
81		3	mp->in_sync = 1;
82		3	mp->bytes_left = 0;
83		3	break;
84			}
85			}
86
87	✓✓	7	if (!mp->in_sync) {
88	✗✓	4	if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1)
89			av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
90		4	return buf_size;
91			}
92
93	✗✓	3	if ((ret = ff_combine_frame(&mp->pc, i - 7, &buf, &buf_size)) < 0) {
94			av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
95			return ret;
96			}
97
98		3	return i - 7;
99			}
100
101	✓✓	18066	if (mp->bytes_left == 0) {
102			// Find length of this packet
103
104			/* Copy overread bytes from last frame into buffer. */
105	✗✓	15790	for(; mp->pc.overread>0; mp->pc.overread--) {
106			mp->pc.buffer[mp->pc.index++]= mp->pc.buffer[mp->pc.overread_index++];
107			}
108
109	✗✓	15790	if (mp->pc.index + buf_size < 2) {
110			if (ff_combine_frame(&mp->pc, END_NOT_FOUND, &buf, &buf_size) != -1)
111			av_log(avctx, AV_LOG_WARNING, "ff_combine_frame failed\n");
112			return buf_size;
113			}
114
115	✗✓	15790	mp->bytes_left = ((mp->pc.index > 0 ? mp->pc.buffer[0] : buf[0]) << 8)
116	✗✓	15790	\| (mp->pc.index > 1 ? mp->pc.buffer[1] : buf[1-mp->pc.index]);
117		15790	mp->bytes_left = (mp->bytes_left & 0xfff) * 2;
118	✗✓	15790	if (mp->bytes_left <= 0) { // prevent infinite loop
119			goto lost_sync;
120			}
121		15790	mp->bytes_left -= mp->pc.index;
122			}
123
124	✓✓	18066	next = (mp->bytes_left > buf_size) ? END_NOT_FOUND : mp->bytes_left;
125
126	✓✓	18066	if (ff_combine_frame(&mp->pc, next, &buf, &buf_size) < 0) {
127		2279	mp->bytes_left -= buf_size;
128		2279	return buf_size;
129			}
130
131		15787	mp->bytes_left = 0;
132			}
133
134	✓✗✓✓	15787	sync_present = buf_size >= 8 && (AV_RB32(buf + 4) & 0xfffffffe) == 0xf8726fba;
135
136	✓✓	15787	if (!sync_present) {
137			/* The first nibble of a frame is a parity check of the 4-byte
138			* access unit header and all the 2- or 4-byte substream headers. */
139			// Only check when this isn't a sync frame - syncs have a checksum.
140
141		14244	s->key_frame = 0;
142
143		14244	parity_bits = 0;
144	✓✓	49124	for (i = -1; i < mp->num_substreams; i++) {
145		34880	parity_bits ^= buf[p++];
146		34880	parity_bits ^= buf[p++];
147
148	✓✓✓✓	34880	if (i < 0 \|\| buf[p-2] & 0x80) {
149		14348	parity_bits ^= buf[p++];
150		14348	parity_bits ^= buf[p++];
151			}
152			}
153
154	✗✓	14244	if ((((parity_bits >> 4) ^ parity_bits) & 0xF) != 0xF) {
155			av_log(avctx, AV_LOG_INFO, "mlpparse: Parity check failed.\n");
156			goto lost_sync;
157			}
158			} else {
159			GetBitContext gb;
160			MLPHeaderInfo mh;
161
162		1543	init_get_bits(&gb, buf + 4, (buf_size - 4) << 3);
163	✗✓	1543	if (ff_mlp_read_major_sync(avctx, &mh, &gb) < 0)
164			goto lost_sync;
165
166		1543	s->key_frame = 1;
167
168		1543	avctx->bits_per_raw_sample = mh.group1_bits;
169	✓✓	1543	if (avctx->bits_per_raw_sample > 16)
170		428	avctx->sample_fmt = AV_SAMPLE_FMT_S32;
171			else
172		1115	avctx->sample_fmt = AV_SAMPLE_FMT_S16;
173		1543	avctx->sample_rate = mh.group1_samplerate;
174		1543	avctx->frame_size =
175		1543	s->duration = mh.access_unit_size;
176
177	✓✓✗✓	1543	if(!avctx->channels \|\| !avctx->channel_layout) {
178	✓✓	3	if (mh.stream_type == 0xbb) {
179			/* MLP stream */
180		1	avctx->channels = mh.channels_mlp;
181		1	avctx->channel_layout = mh.channel_layout_mlp;
182			} else { /* mh.stream_type == 0xba */
183			/* TrueHD stream */
184	✗✓	2	if (!mh.channels_thd_stream2) {
185			avctx->channels = mh.channels_thd_stream1;
186			avctx->channel_layout = mh.channel_layout_thd_stream1;
187			} else {
188		2	avctx->channels = mh.channels_thd_stream2;
189		2	avctx->channel_layout = mh.channel_layout_thd_stream2;
190			}
191			}
192			}
193
194	✗✓	1543	if (!mh.is_vbr) /* Stream is CBR */
195			avctx->bit_rate = mh.peak_bitrate;
196
197		1543	mp->num_substreams = mh.num_substreams;
198			}
199
200		15787	*poutbuf = buf;
201		15787	*poutbuf_size = buf_size;
202
203		15787	return next;
204
205			lost_sync:
206			mp->in_sync = 0;
207			return 1;
208			}
209
210			AVCodecParser ff_mlp_parser = {
211			.codec_ids = { AV_CODEC_ID_MLP, AV_CODEC_ID_TRUEHD },
212			.priv_data_size = sizeof(MLPParseContext),
213			.parser_init = mlp_init,
214			.parser_parse = mlp_parse,
215			.parser_close = ff_parse_close,
216			};