FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/truehd_core_bsf.c	Lines:	71	85	83.5 %
Date:	2021-01-20 23:14:43	Branches:	31	40	77.5 %


/*
 * Copyright (c) 2018 Paul B Mahol
 *
 * 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
 */

#include "bsf.h"
#include "bsf_internal.h"
#include "get_bits.h"
#include "mlp_parse.h"
#include "mlp.h"

typedef struct AccessUnit {
    uint8_t bits[4];
    uint16_t offset;
    uint16_t optional;
} AccessUnit;

typedef struct TrueHDCoreContext {
    MLPHeaderInfo hdr;
} TrueHDCoreContext;

static int truehd_core_filter(AVBSFContext *ctx, AVPacket *pkt)
{
    TrueHDCoreContext *s = ctx->priv_data;
    GetBitContext gbc;
    AccessUnit units[MAX_SUBSTREAMS];
    int ret, i, last_offset = 0;
    int in_size, out_size;
    int have_header = 0;
    int substream_bytes = 0;
    int end;

    ret = ff_bsf_get_packet_ref(ctx, pkt);
    if (ret < 0)
        return ret;

    if (pkt->size < 4) {
        ret = AVERROR_INVALIDDATA;
        goto fail;
    }

    in_size = (AV_RB16(pkt->data) & 0xFFF) * 2;
    if (in_size < 4 || in_size > pkt->size) {
        ret = AVERROR_INVALIDDATA;
        goto fail;
    }

    ret = init_get_bits8(&gbc, pkt->data + 4, pkt->size - 4);
    if (ret < 0)
        goto fail;

    if (show_bits_long(&gbc, 32) == 0xf8726fba) {
        if ((ret = ff_mlp_read_major_sync(ctx, &s->hdr, &gbc)) < 0)
            goto fail;
        have_header = 1;
    }

    if (s->hdr.num_substreams > MAX_SUBSTREAMS) {
        ret = AVERROR_INVALIDDATA;
        goto fail;
    }

    for (i = 0; i < s->hdr.num_substreams; i++) {
        for (int j = 0; j < 4; j++)
            units[i].bits[j] = get_bits1(&gbc);

        units[i].offset = get_bits(&gbc, 12);
        if (i < 3) {
            last_offset = units[i].offset * 2;
            substream_bytes += 2;
        }

        if (units[i].bits[0]) {
            units[i].optional = get_bits(&gbc, 16);
            if (i < 3)
                substream_bytes += 2;
        }
    }
    end = get_bits_count(&gbc) >> 3;

    out_size = end + 4 + last_offset;
    if (out_size < in_size) {
        int bpos = 0, reduce = end - have_header * 28 - substream_bytes;
        uint16_t parity_nibble, dts = AV_RB16(pkt->data + 2);
        uint16_t auheader;
        uint8_t header[28];

        av_assert1(reduce >= 0 && reduce % 2 == 0);

        if (have_header) {
            memcpy(header, pkt->data + 4, 28);
            header[16]  = (header[16] & 0x0c) | (FFMIN(s->hdr.num_substreams, 3) << 4);
            header[17] &= 0x7f;
            header[25] &= 0xfe;
            AV_WL16(header + 26, ff_mlp_checksum16(header, 26));
        }

        pkt->data += reduce;
        out_size  -= reduce;
        pkt->size  = out_size;

        ret = av_packet_make_writable(pkt);
        if (ret < 0)
            goto fail;

        AV_WB16(pkt->data + 2, dts);
        parity_nibble = dts;
        parity_nibble ^= out_size / 2;

        for (i = 0; i < FFMIN(s->hdr.num_substreams, 3); i++) {
            uint16_t substr_hdr = 0;

            substr_hdr |= (units[i].bits[0] << 15);
            substr_hdr |= (units[i].bits[1] << 14);
            substr_hdr |= (units[i].bits[2] << 13);
            substr_hdr |= (units[i].bits[3] << 12);
            substr_hdr |=  units[i].offset;

            AV_WB16(pkt->data + have_header * 28 + 4 + bpos, substr_hdr);

            parity_nibble ^= substr_hdr;
            bpos          += 2;

            if (units[i].bits[0]) {
                AV_WB16(pkt->data + have_header * 28 + 4 + bpos, units[i].optional);

                parity_nibble ^= units[i].optional;
                bpos          += 2;
            }
        }

        parity_nibble ^= parity_nibble >> 8;
        parity_nibble ^= parity_nibble >> 4;
        parity_nibble &= 0xF;

        auheader  = (parity_nibble ^ 0xF) << 12;
        auheader |= (out_size / 2) & 0x0fff;
        AV_WB16(pkt->data, auheader);

        if (have_header)
            memcpy(pkt->data + 4, header, 28);
    }

fail:
    if (ret < 0)
        av_packet_unref(pkt);

    return ret;
}

static void truehd_core_flush(AVBSFContext *ctx)
{
    TrueHDCoreContext *s = ctx->priv_data;
    memset(&s->hdr, 0, sizeof(s->hdr));
}

static const enum AVCodecID codec_ids[] = {
    AV_CODEC_ID_TRUEHD, AV_CODEC_ID_NONE,
};

const AVBitStreamFilter ff_truehd_core_bsf = {
    .name           = "truehd_core",
    .priv_data_size = sizeof(TrueHDCoreContext),
    .filter         = truehd_core_filter,
    .flush          = truehd_core_flush,
    .codec_ids      = codec_ids,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Copyright (c) 2018 Paul B Mahol
3			*
4			* This file is part of FFmpeg.
5			*
6			* FFmpeg is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10			*
11			* FFmpeg is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public
17			* License along with FFmpeg; if not, write to the Free Software
18			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19			*/
20
21			#include "bsf.h"
22			#include "bsf_internal.h"
23			#include "get_bits.h"
24			#include "mlp_parse.h"
25			#include "mlp.h"
26
27			typedef struct AccessUnit {
28			uint8_t bits[4];
29			uint16_t offset;
30			uint16_t optional;
31			} AccessUnit;
32
33			typedef struct TrueHDCoreContext {
34			MLPHeaderInfo hdr;
35			} TrueHDCoreContext;
36
37		256	static int truehd_core_filter(AVBSFContext ctx, AVPacket pkt)
38			{
39		256	TrueHDCoreContext *s = ctx->priv_data;
40			GetBitContext gbc;
41			AccessUnit units[MAX_SUBSTREAMS];
42		256	int ret, i, last_offset = 0;
43			int in_size, out_size;
44		256	int have_header = 0;
45		256	int substream_bytes = 0;
46			int end;
47
48		256	ret = ff_bsf_get_packet_ref(ctx, pkt);
49	✓✓	256	if (ret < 0)
50		128	return ret;
51
52	✗✓	128	if (pkt->size < 4) {
53			ret = AVERROR_INVALIDDATA;
54			goto fail;
55			}
56
57		128	in_size = (AV_RB16(pkt->data) & 0xFFF) * 2;
58	✓✗✗✓	128	if (in_size < 4 \|\| in_size > pkt->size) {
59			ret = AVERROR_INVALIDDATA;
60			goto fail;
61			}
62
63		128	ret = init_get_bits8(&gbc, pkt->data + 4, pkt->size - 4);
64	✗✓	128	if (ret < 0)
65			goto fail;
66
67	✓✓	128	if (show_bits_long(&gbc, 32) == 0xf8726fba) {
68	✗✓	1	if ((ret = ff_mlp_read_major_sync(ctx, &s->hdr, &gbc)) < 0)
69			goto fail;
70		1	have_header = 1;
71			}
72
73	✗✓	128	if (s->hdr.num_substreams > MAX_SUBSTREAMS) {
74			ret = AVERROR_INVALIDDATA;
75			goto fail;
76			}
77
78	✓✓	640	for (i = 0; i < s->hdr.num_substreams; i++) {
79	✓✓	2560	for (int j = 0; j < 4; j++)
80		2048	units[i].bits[j] = get_bits1(&gbc);
81
82		512	units[i].offset = get_bits(&gbc, 12);
83	✓✓	512	if (i < 3) {
84		384	last_offset = units[i].offset * 2;
85		384	substream_bytes += 2;
86			}
87
88	✓✓	512	if (units[i].bits[0]) {
89		4	units[i].optional = get_bits(&gbc, 16);
90	✓✓	4	if (i < 3)
91		3	substream_bytes += 2;
92			}
93			}
94		128	end = get_bits_count(&gbc) >> 3;
95
96		128	out_size = end + 4 + last_offset;
97	✗✓	128	if (out_size < in_size) {
98		128	int bpos = 0, reduce = end - have_header * 28 - substream_bytes;
99		128	uint16_t parity_nibble, dts = AV_RB16(pkt->data + 2);
100			uint16_t auheader;
101			uint8_t header[28];
102
103			av_assert1(reduce >= 0 && reduce % 2 == 0);
104
105	✓✓	128	if (have_header) {
106		1	memcpy(header, pkt->data + 4, 28);
107		1	header[16] = (header[16] & 0x0c) \| (FFMIN(s->hdr.num_substreams, 3) << 4);
108		1	header[17] &= 0x7f;
109		1	header[25] &= 0xfe;
110		1	AV_WL16(header + 26, ff_mlp_checksum16(header, 26));
111			}
112
113		128	pkt->data += reduce;
114		128	out_size -= reduce;
115		128	pkt->size = out_size;
116
117		128	ret = av_packet_make_writable(pkt);
118	✗✓	128	if (ret < 0)
119			goto fail;
120
121		128	AV_WB16(pkt->data + 2, dts);
122		128	parity_nibble = dts;
123		128	parity_nibble ^= out_size / 2;
124
125	✓✓	512	for (i = 0; i < FFMIN(s->hdr.num_substreams, 3); i++) {
126		384	uint16_t substr_hdr = 0;
127
128		384	substr_hdr \|= (units[i].bits[0] << 15);
129		384	substr_hdr \|= (units[i].bits[1] << 14);
130		384	substr_hdr \|= (units[i].bits[2] << 13);
131		384	substr_hdr \|= (units[i].bits[3] << 12);
132		384	substr_hdr \|= units[i].offset;
133
134		384	AV_WB16(pkt->data + have_header * 28 + 4 + bpos, substr_hdr);
135
136		384	parity_nibble ^= substr_hdr;
137		384	bpos += 2;
138
139	✓✓	384	if (units[i].bits[0]) {
140		3	AV_WB16(pkt->data + have_header * 28 + 4 + bpos, units[i].optional);
141
142		3	parity_nibble ^= units[i].optional;
143		3	bpos += 2;
144			}
145			}
146
147		128	parity_nibble ^= parity_nibble >> 8;
148		128	parity_nibble ^= parity_nibble >> 4;
149		128	parity_nibble &= 0xF;
150
151		128	auheader = (parity_nibble ^ 0xF) << 12;
152		128	auheader \|= (out_size / 2) & 0x0fff;
153		128	AV_WB16(pkt->data, auheader);
154
155	✓✓	128	if (have_header)
156		1	memcpy(pkt->data + 4, header, 28);
157			}
158
159			fail:
160	✗✓	128	if (ret < 0)
161			av_packet_unref(pkt);
162
163		128	return ret;
164			}
165
166			static void truehd_core_flush(AVBSFContext *ctx)
167			{
168			TrueHDCoreContext *s = ctx->priv_data;
169			memset(&s->hdr, 0, sizeof(s->hdr));
170			}
171
172			static const enum AVCodecID codec_ids[] = {
173			AV_CODEC_ID_TRUEHD, AV_CODEC_ID_NONE,
174			};
175
176			const AVBitStreamFilter ff_truehd_core_bsf = {
177			.name = "truehd_core",
178			.priv_data_size = sizeof(TrueHDCoreContext),
179			.filter = truehd_core_filter,
180			.flush = truehd_core_flush,
181			.codec_ids = codec_ids,
182			};