/* * APE tag handling * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org> * based upon libdemac from Dave Chapman. * * 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/intreadwrite.h" #include "libavutil/dict.h" #include "avformat.h" #include "apetag.h" #include "internal.h" #define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31) #define APE_TAG_FLAG_IS_HEADER (1 << 29) #define APE_TAG_FLAG_IS_BINARY (1 << 1) static int ape_tag_read_field(AVFormatContext *s) { AVIOContext *pb = s->pb; uint8_t key[1024], *value; uint32_t size, flags; int i, c; size = avio_rl32(pb); /* field size */ flags = avio_rl32(pb); /* field flags */ for (i = 0; i < sizeof(key) - 1; i++) { c = avio_r8(pb); if (c < 0x20 || c > 0x7E) break; else key[i] = c; } key[i] = 0; if (c != 0) { av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key); return -1; } if (size >= UINT_MAX) return -1; if (flags & APE_TAG_FLAG_IS_BINARY) { uint8_t filename[1024]; enum AVCodecID id; AVStream *st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); size -= avio_get_str(pb, size, filename, sizeof(filename)); if (size <= 0) { av_log(s, AV_LOG_WARNING, "Skipping binary tag '%s'.\n", key); return 0; } av_dict_set(&st->metadata, key, filename, 0); if ((id = ff_guess_image2_codec(filename)) != AV_CODEC_ID_NONE) { AVPacket pkt; int ret; ret = av_get_packet(s->pb, &pkt, size); if (ret < 0) { av_log(s, AV_LOG_ERROR, "Error reading cover art.\n"); return ret; } st->disposition |= AV_DISPOSITION_ATTACHED_PIC; st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = id; st->attached_pic = pkt; st->attached_pic.stream_index = st->index; st->attached_pic.flags |= AV_PKT_FLAG_KEY; } else { st->codec->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); if (!st->codec->extradata) return AVERROR(ENOMEM); if (avio_read(pb, st->codec->extradata, size) != size) { av_freep(&st->codec->extradata); return AVERROR(EIO); } st->codec->extradata_size = size; st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT; } } else { value = av_malloc(size+1); if (!value) return AVERROR(ENOMEM); c = avio_read(pb, value, size); if (c < 0) { av_free(value); return c; } value[c] = 0; av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL); } return 0; } int64_t ff_ape_parse_tag(AVFormatContext *s) { AVIOContext *pb = s->pb; int file_size = avio_size(pb); uint32_t val, fields, tag_bytes; uint8_t buf[8]; int64_t tag_start; int i; if (file_size < APE_TAG_FOOTER_BYTES) return 0; avio_seek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET); avio_read(pb, buf, 8); /* APETAGEX */ if (strncmp(buf, APE_TAG_PREAMBLE, 8)) { return 0; } val = avio_rl32(pb); /* APE tag version */ if (val > APE_TAG_VERSION) { av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION); return 0; } tag_bytes = avio_rl32(pb); /* tag size */ if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) { av_log(s, AV_LOG_ERROR, "Tag size is way too big\n"); return 0; } if (tag_bytes > file_size - APE_TAG_FOOTER_BYTES) { av_log(s, AV_LOG_ERROR, "Invalid tag size %u.\n", tag_bytes); return 0; } tag_start = file_size - tag_bytes - APE_TAG_FOOTER_BYTES; fields = avio_rl32(pb); /* number of fields */ if (fields > 65536) { av_log(s, AV_LOG_ERROR, "Too many tag fields (%d)\n", fields); return 0; } val = avio_rl32(pb); /* flags */ if (val & APE_TAG_FLAG_IS_HEADER) { av_log(s, AV_LOG_ERROR, "APE Tag is a header\n"); return 0; } avio_seek(pb, file_size - tag_bytes, SEEK_SET); for (i=0; i<fields; i++) if (ape_tag_read_field(s) < 0) break; return tag_start; }