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 28int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size) 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); 47 if (s->error_recognition & AV_EF_EXPLODE) { 48 RETURN_ERROR(AVERROR_INVALIDDATA); 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"); 59 if (s->error_recognition & AV_EF_EXPLODE) 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); 76 if (s->error_recognition & AV_EF_EXPLODE) 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"); 90 if (s->error_recognition & AV_EF_EXPLODE) 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); 106 if (s->error_recognition & AV_EF_EXPLODE) 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"); 116 if (s->error_recognition & AV_EF_EXPLODE) 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 } 125 126 av_init_packet(&st->attached_pic); 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; 131 st->attached_pic.flags |= AV_PKT_FLAG_KEY; 132 133 st->disposition |= AV_DISPOSITION_ATTACHED_PIC; 134 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 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 146fail: 147 av_buffer_unref(&data); 148 av_freep(&desc); 149 av_freep(&pb); 150 151 return ret; 152} 153