summaryrefslogtreecommitdiff
path: root/libavformat/flac_picture.c
blob: 669fd2e7825f973802d01b29d4307bb601f80222 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/*
 * Raw FLAC picture parser
 * Copyright (c) 2001 Fabrice Bellard
 *
 * 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 "libavutil/avassert.h"
#include "avformat.h"
#include "flac_picture.h"
#include "id3v2.h"
#include "internal.h"

int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
{
    const CodecMime *mime = ff_id3v2_mime_tags;
    enum AVCodecID id = AV_CODEC_ID_NONE;
    AVBufferRef *data = NULL;
    uint8_t mimetype[64], *desc = NULL;
    AVIOContext *pb = NULL;
    AVStream *st;
    int width, height, ret = 0;
    int len;
    unsigned int type;

    pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
    if (!pb)
        return AVERROR(ENOMEM);

    /* read the picture type */
    type = avio_rb32(pb);
    if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types)) {
        av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
        if (s->error_recognition & AV_EF_EXPLODE) {
            RETURN_ERROR(AVERROR_INVALIDDATA);
        }
        type = 0;
    }

    /* picture mimetype */
    len = avio_rb32(pb);
    if (len <= 0 || len >= 64 ||
        avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
        av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
               "picture.\n");
        if (s->error_recognition & AV_EF_EXPLODE)
            ret = AVERROR_INVALIDDATA;
        goto fail;
    }
    av_assert0(len < sizeof(mimetype));
    mimetype[len] = 0;

    while (mime->id != AV_CODEC_ID_NONE) {
        if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
            id = mime->id;
            break;
        }
        mime++;
    }
    if (id == AV_CODEC_ID_NONE) {
        av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
               mimetype);
        if (s->error_recognition & AV_EF_EXPLODE)
            ret = AVERROR_INVALIDDATA;
        goto fail;
    }

    /* picture description */
    len = avio_rb32(pb);
    if (len > 0) {
        if (!(desc = av_malloc(len + 1))) {
            RETURN_ERROR(AVERROR(ENOMEM));
        }

        if (avio_read(pb, desc, len) != len) {
            av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
            if (s->error_recognition & AV_EF_EXPLODE)
                ret = AVERROR(EIO);
            goto fail;
        }
        desc[len] = 0;
    }

    /* picture metadata */
    width  = avio_rb32(pb);
    height = avio_rb32(pb);
    avio_skip(pb, 8);

    /* picture data */
    len = avio_rb32(pb);
    if (len <= 0) {
        av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
        if (s->error_recognition & AV_EF_EXPLODE)
            ret = AVERROR_INVALIDDATA;
        goto fail;
    }
    if (!(data = av_buffer_alloc(len + FF_INPUT_BUFFER_PADDING_SIZE))) {
        RETURN_ERROR(AVERROR(ENOMEM));
    }
    memset(data->data + len, 0, FF_INPUT_BUFFER_PADDING_SIZE);
    if (avio_read(pb, data->data, len) != len) {
        av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
        if (s->error_recognition & AV_EF_EXPLODE)
            ret = AVERROR(EIO);
        goto fail;
    }

    st = avformat_new_stream(s, NULL);
    if (!st) {
        RETURN_ERROR(AVERROR(ENOMEM));
    }

    av_init_packet(&st->attached_pic);
    st->attached_pic.buf          = data;
    st->attached_pic.data         = data->data;
    st->attached_pic.size         = len;
    st->attached_pic.stream_index = st->index;
    st->attached_pic.flags       |= AV_PKT_FLAG_KEY;

    st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;
    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
    st->codec->codec_id   = id;
    st->codec->width      = width;
    st->codec->height     = height;
    av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
    if (desc)
        av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);

    av_freep(&pb);

    return 0;

fail:
    av_buffer_unref(&data);
    av_freep(&desc);
    av_freep(&pb);

    return ret;
}