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flac_picture.c
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1 /*
2  * Raw FLAC picture parser
3  * Copyright (c) 2001 Fabrice Bellard
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 #include "libavutil/avassert.h"
23 #include "avformat.h"
24 #include "flac_picture.h"
25 #include "id3v2.h"
26 #include "internal.h"
27 
29 {
30  const CodecMime *mime = ff_id3v2_mime_tags;
31  enum AVCodecID id = AV_CODEC_ID_NONE;
32  AVBufferRef *data = NULL;
33  uint8_t mimetype[64], *desc = NULL;
34  AVIOContext *pb = NULL;
35  AVStream *st;
36  int width, height, ret = 0;
37  int len;
38  unsigned int type;
39 
40  pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
41  if (!pb)
42  return AVERROR(ENOMEM);
43 
44  /* read the picture type */
45  type = avio_rb32(pb);
47  av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
50  }
51  type = 0;
52  }
53 
54  /* picture mimetype */
55  len = avio_rb32(pb);
56  if (len <= 0 || len >= 64 ||
57  avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
58  av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
59  "picture.\n");
61  ret = AVERROR_INVALIDDATA;
62  goto fail;
63  }
64  av_assert0(len < sizeof(mimetype));
65  mimetype[len] = 0;
66 
67  while (mime->id != AV_CODEC_ID_NONE) {
68  if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
69  id = mime->id;
70  break;
71  }
72  mime++;
73  }
74  if (id == AV_CODEC_ID_NONE) {
75  av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
76  mimetype);
78  ret = AVERROR_INVALIDDATA;
79  goto fail;
80  }
81 
82  /* picture description */
83  len = avio_rb32(pb);
84  if (len > 0) {
85  if (!(desc = av_malloc(len + 1))) {
86  RETURN_ERROR(AVERROR(ENOMEM));
87  }
88 
89  if (avio_read(pb, desc, len) != len) {
90  av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
92  ret = AVERROR(EIO);
93  goto fail;
94  }
95  desc[len] = 0;
96  }
97 
98  /* picture metadata */
99  width = avio_rb32(pb);
100  height = avio_rb32(pb);
101  avio_skip(pb, 8);
102 
103  /* picture data */
104  len = avio_rb32(pb);
105  if (len <= 0) {
106  av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
108  ret = AVERROR_INVALIDDATA;
109  goto fail;
110  }
111  if (!(data = av_buffer_alloc(len + FF_INPUT_BUFFER_PADDING_SIZE))) {
112  RETURN_ERROR(AVERROR(ENOMEM));
113  }
114  memset(data->data + len, 0, FF_INPUT_BUFFER_PADDING_SIZE);
115  if (avio_read(pb, data->data, len) != len) {
116  av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
118  ret = AVERROR(EIO);
119  goto fail;
120  }
121 
122  st = avformat_new_stream(s, NULL);
123  if (!st) {
124  RETURN_ERROR(AVERROR(ENOMEM));
125  }
126 
128  st->attached_pic.buf = data;
129  st->attached_pic.data = data->data;
130  st->attached_pic.size = len;
131  st->attached_pic.stream_index = st->index;
133 
136  st->codec->codec_id = id;
137  st->codec->width = width;
138  st->codec->height = height;
139  av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
140  if (desc)
141  av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
142 
143  av_freep(&pb);
144 
145  return 0;
146 
147 fail:
148  av_buffer_unref(&data);
149  av_freep(&desc);
150  av_freep(&pb);
151 
152  return ret;
153 }