mirror of https://git.ffmpeg.org/ffmpeg.git
236 lines
7.0 KiB
C
236 lines
7.0 KiB
C
/*
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* APE tag handling
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* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
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* based upon libdemac from Dave Chapman.
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <inttypes.h>
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#include "libavutil/intreadwrite.h"
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#include "libavutil/dict.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "apetag.h"
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#include "internal.h"
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#define APE_TAG_VERSION 2000
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#define APE_TAG_FOOTER_BYTES 32
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#define APE_TAG_HEADER_BYTES 32
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#define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31)
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#define APE_TAG_FLAG_LACKS_FOOTER (1 << 30)
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#define APE_TAG_FLAG_IS_HEADER (1 << 29)
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#define APE_TAG_FLAG_IS_BINARY (1 << 1)
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static int ape_tag_read_field(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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uint8_t key[1024], *value;
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int64_t size, flags;
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int i, c;
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size = avio_rl32(pb); /* field size */
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flags = avio_rl32(pb); /* field flags */
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for (i = 0; i < sizeof(key) - 1; i++) {
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c = avio_r8(pb);
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if (c < 0x20 || c > 0x7E)
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break;
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else
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key[i] = c;
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}
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key[i] = 0;
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if (c != 0) {
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av_log(s, AV_LOG_WARNING, "Invalid APE tag key '%s'.\n", key);
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return -1;
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}
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if (size > INT32_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
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av_log(s, AV_LOG_ERROR, "APE tag size too large.\n");
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return AVERROR_INVALIDDATA;
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}
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if (flags & APE_TAG_FLAG_IS_BINARY) {
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uint8_t filename[1024];
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enum AVCodecID id;
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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size -= avio_get_str(pb, size, filename, sizeof(filename));
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if (size <= 0) {
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av_log(s, AV_LOG_WARNING, "Skipping binary tag '%s'.\n", key);
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return 0;
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}
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av_dict_set(&st->metadata, key, filename, 0);
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if ((id = ff_guess_image2_codec(filename)) != AV_CODEC_ID_NONE) {
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AVPacket pkt;
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int ret;
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ret = av_get_packet(s->pb, &pkt, size);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "Error reading cover art.\n");
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return ret;
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}
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st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = id;
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st->attached_pic = pkt;
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st->attached_pic.stream_index = st->index;
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st->attached_pic.flags |= AV_PKT_FLAG_KEY;
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} else {
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st->codecpar->extradata = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!st->codecpar->extradata)
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return AVERROR(ENOMEM);
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if (avio_read(pb, st->codecpar->extradata, size) != size) {
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av_freep(&st->codecpar->extradata);
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return AVERROR(EIO);
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}
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st->codecpar->extradata_size = size;
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st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
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}
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} else {
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value = av_malloc(size+1);
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if (!value)
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return AVERROR(ENOMEM);
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c = avio_read(pb, value, size);
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if (c < 0) {
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av_free(value);
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return c;
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}
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value[c] = 0;
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av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
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}
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return 0;
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}
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int64_t ff_ape_parse_tag(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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int64_t file_size = avio_size(pb);
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uint32_t val, fields, tag_bytes;
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uint8_t buf[8];
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int64_t tag_start;
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int i;
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if (file_size < APE_TAG_FOOTER_BYTES)
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return 0;
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avio_seek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
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avio_read(pb, buf, 8); /* APETAGEX */
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if (strncmp(buf, "APETAGEX", 8)) {
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return 0;
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}
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val = avio_rl32(pb); /* APE tag version */
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if (val > APE_TAG_VERSION) {
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av_log(s, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
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return 0;
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}
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tag_bytes = avio_rl32(pb); /* tag size */
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if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
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av_log(s, AV_LOG_ERROR, "Tag size is way too big\n");
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return 0;
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}
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if (tag_bytes > file_size - APE_TAG_FOOTER_BYTES) {
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av_log(s, AV_LOG_ERROR, "Invalid tag size %"PRIu32".\n", tag_bytes);
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return 0;
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}
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fields = avio_rl32(pb); /* number of fields */
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if (fields > 65536) {
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av_log(s, AV_LOG_ERROR, "Too many tag fields (%"PRIu32")\n", fields);
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return 0;
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}
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val = avio_rl32(pb); /* flags */
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if (val & APE_TAG_FLAG_IS_HEADER) {
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av_log(s, AV_LOG_ERROR, "APE Tag is a header\n");
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return 0;
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}
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avio_seek(pb, file_size - tag_bytes, SEEK_SET);
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if (val & APE_TAG_FLAG_CONTAINS_HEADER)
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tag_bytes += APE_TAG_HEADER_BYTES;
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tag_start = file_size - tag_bytes;
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for (i=0; i<fields; i++)
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if (ape_tag_read_field(s) < 0) break;
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return tag_start;
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}
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int ff_ape_write_tag(AVFormatContext *s)
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{
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AVDictionaryEntry *e = NULL;
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int64_t start, end;
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int size, count = 0;
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if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
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return 0;
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start = avio_tell(s->pb);
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// header
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avio_write(s->pb, "APETAGEX", 8); // id
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avio_wl32 (s->pb, APE_TAG_VERSION); // version
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avio_wl32(s->pb, 0); // reserve space for size
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avio_wl32(s->pb, 0); // reserve space for tag count
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// flags
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avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_IS_HEADER);
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ffio_fill(s->pb, 0, 8); // reserved
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while ((e = av_dict_get(s->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
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int val_len = strlen(e->value);
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avio_wl32(s->pb, val_len); // value length
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avio_wl32(s->pb, 0); // item flags
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avio_put_str(s->pb, e->key); // key
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avio_write(s->pb, e->value, val_len); // value
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count++;
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}
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size = avio_tell(s->pb) - start;
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// footer
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avio_write(s->pb, "APETAGEX", 8); // id
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avio_wl32 (s->pb, APE_TAG_VERSION); // version
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avio_wl32(s->pb, size); // size
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avio_wl32(s->pb, count); // tag count
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// flags
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avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER);
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ffio_fill(s->pb, 0, 8); // reserved
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// update values in the header
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end = avio_tell(s->pb);
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avio_seek(s->pb, start + 12, SEEK_SET);
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avio_wl32(s->pb, size);
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avio_wl32(s->pb, count);
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avio_seek(s->pb, end, SEEK_SET);
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return 0;
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}
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