2 * Raw FLAC picture parser
3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/intreadwrite.h"
23 #include "libavcodec/bytestream.h"
24 #include "libavcodec/png.h"
26 #include "flac_picture.h"
30 int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
32 const CodecMime *mime = ff_id3v2_mime_tags;
33 enum AVCodecID id = AV_CODEC_ID_NONE;
34 AVBufferRef *data = NULL;
35 uint8_t mimetype[64], *desc = NULL;
38 int width, height, ret = 0;
39 unsigned int len, type;
42 av_log(s, AV_LOG_ERROR, "Attached picture metadata block too short\n");
43 if (s->error_recognition & AV_EF_EXPLODE)
44 return AVERROR_INVALIDDATA;
48 bytestream2_init(&g, buf, buf_size);
50 /* read the picture type */
51 type = bytestream2_get_be32u(&g);
52 if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types)) {
53 av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
54 if (s->error_recognition & AV_EF_EXPLODE) {
55 return AVERROR_INVALIDDATA;
60 /* picture mimetype */
61 len = bytestream2_get_be32u(&g);
62 if (len <= 0 || len >= sizeof(mimetype)) {
63 av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
65 if (s->error_recognition & AV_EF_EXPLODE)
66 return AVERROR_INVALIDDATA;
69 if (len + 24 > bytestream2_get_bytes_left(&g)) {
70 av_log(s, AV_LOG_ERROR, "Attached picture metadata block too short\n");
71 if (s->error_recognition & AV_EF_EXPLODE)
72 return AVERROR_INVALIDDATA;
75 bytestream2_get_bufferu(&g, mimetype, len);
78 while (mime->id != AV_CODEC_ID_NONE) {
79 if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
85 if (id == AV_CODEC_ID_NONE) {
86 av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
88 if (s->error_recognition & AV_EF_EXPLODE)
89 return AVERROR_INVALIDDATA;
93 /* picture description */
94 len = bytestream2_get_be32u(&g);
95 if (len > bytestream2_get_bytes_left(&g) - 20) {
96 av_log(s, AV_LOG_ERROR, "Attached picture metadata block too short\n");
97 if (s->error_recognition & AV_EF_EXPLODE)
98 return AVERROR_INVALIDDATA;
102 if (!(desc = av_malloc(len + 1))) {
103 return AVERROR(ENOMEM);
106 bytestream2_get_bufferu(&g, desc, len);
110 /* picture metadata */
111 width = bytestream2_get_be32u(&g);
112 height = bytestream2_get_be32u(&g);
113 bytestream2_skipu(&g, 8);
116 len = bytestream2_get_be32u(&g);
117 if (len <= 0 || len > bytestream2_get_bytes_left(&g)) {
118 av_log(s, AV_LOG_ERROR, "Attached picture metadata block too short\n");
119 if (s->error_recognition & AV_EF_EXPLODE)
120 ret = AVERROR_INVALIDDATA;
123 if (!(data = av_buffer_alloc(len + AV_INPUT_BUFFER_PADDING_SIZE))) {
124 RETURN_ERROR(AVERROR(ENOMEM));
126 bytestream2_get_bufferu(&g, data->data, len);
127 memset(data->data + len, 0, AV_INPUT_BUFFER_PADDING_SIZE);
129 if (AV_RB64(data->data) == PNGSIG)
130 id = AV_CODEC_ID_PNG;
132 st = avformat_new_stream(s, NULL);
134 RETURN_ERROR(AVERROR(ENOMEM));
137 av_init_packet(&st->attached_pic);
138 st->attached_pic.buf = data;
139 st->attached_pic.data = data->data;
140 st->attached_pic.size = len;
141 st->attached_pic.stream_index = st->index;
142 st->attached_pic.flags |= AV_PKT_FLAG_KEY;
144 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
145 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
146 st->codecpar->codec_id = id;
147 st->codecpar->width = width;
148 st->codecpar->height = height;
149 av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
151 av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
156 av_buffer_unref(&data);