FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
flac_picture.c
Go to the documentation of this file.
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 type, width, height;
37  int len, ret = 0;
38 
39  pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
40  if (!pb)
41  return AVERROR(ENOMEM);
42 
43  /* read the picture type */
44  type = avio_rb32(pb);
45  if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
46  av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
49  }
50  type = 0;
51  }
52 
53  /* picture mimetype */
54  len = avio_rb32(pb);
55  if (len <= 0 ||
56  avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
57  av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
58  "picture.\n");
60  ret = AVERROR_INVALIDDATA;
61  goto fail;
62  }
63  av_assert0(len < sizeof(mimetype));
64  mimetype[len] = 0;
65 
66  while (mime->id != AV_CODEC_ID_NONE) {
67  if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
68  id = mime->id;
69  break;
70  }
71  mime++;
72  }
73  if (id == AV_CODEC_ID_NONE) {
74  av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
75  mimetype);
77  ret = AVERROR_INVALIDDATA;
78  goto fail;
79  }
80 
81  /* picture description */
82  len = avio_rb32(pb);
83  if (len > 0) {
84  if (!(desc = av_malloc(len + 1))) {
85  RETURN_ERROR(AVERROR(ENOMEM));
86  }
87 
88  if (avio_read(pb, desc, len) != len) {
89  av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
91  ret = AVERROR(EIO);
92  goto fail;
93  }
94  desc[len] = 0;
95  }
96 
97  /* picture metadata */
98  width = avio_rb32(pb);
99  height = avio_rb32(pb);
100  avio_skip(pb, 8);
101 
102  /* picture data */
103  len = avio_rb32(pb);
104  if (len <= 0) {
105  av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
107  ret = AVERROR_INVALIDDATA;
108  goto fail;
109  }
110  if (!(data = av_buffer_alloc(len + FF_INPUT_BUFFER_PADDING_SIZE))) {
111  RETURN_ERROR(AVERROR(ENOMEM));
112  }
113  memset(data->data + len, 0, FF_INPUT_BUFFER_PADDING_SIZE);
114  if (avio_read(pb, data->data, len) != len) {
115  av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
117  ret = AVERROR(EIO);
118  goto fail;
119  }
120 
121  st = avformat_new_stream(s, NULL);
122  if (!st) {
123  RETURN_ERROR(AVERROR(ENOMEM));
124  }
125 
127  st->attached_pic.buf = data;
128  st->attached_pic.data = data->data;
129  st->attached_pic.size = len;
130  st->attached_pic.stream_index = st->index;
132 
135  st->codec->codec_id = id;
136  st->codec->width = width;
137  st->codec->height = height;
138  av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
139  if (desc)
140  av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
141 
142  av_freep(&pb);
143 
144  return 0;
145 
146 fail:
147  av_buffer_unref(&data);
148  av_freep(&desc);
149  av_freep(&pb);
150 
151  return ret;
152 }