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FFmpeg/libavformat/apetag.c
Andreas Rheinhardt 39ecb63d0f avformat: Add and use helper function to add attachment streams
All instances of adding attached pictures to a stream or adding
a stream and an attached packet to said stream have several things
in common like setting the index and flags of the packet, setting
the stream disposition etc. This commit therefore factors this out.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-04-01 18:23:13 +02:00

236 lines
6.7 KiB
C

/*
* 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 <inttypes.h>
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "avio_internal.h"
#include "apetag.h"
#include "internal.h"
#define APE_TAG_FLAG_CONTAINS_HEADER (1U << 31)
#define APE_TAG_FLAG_LACKS_FOOTER (1 << 30)
#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;
int64_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 > INT32_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
av_log(s, AV_LOG_ERROR, "APE tag size too large.\n");
return AVERROR_INVALIDDATA;
}
if (flags & APE_TAG_FLAG_IS_BINARY) {
uint8_t filename[1024];
enum AVCodecID id;
int ret;
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
ret = avio_get_str(pb, size, filename, sizeof(filename));
if (ret < 0)
return ret;
if (size <= ret) {
av_log(s, AV_LOG_WARNING, "Skipping binary tag '%s'.\n", key);
return 0;
}
size -= ret;
av_dict_set(&st->metadata, key, filename, 0);
if ((id = ff_guess_image2_codec(filename)) != AV_CODEC_ID_NONE) {
int ret = ff_add_attached_pic(s, st, s->pb, NULL, size);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Error reading cover art.\n");
return ret;
}
st->codecpar->codec_id = id;
} else {
if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0)
return ret;
st->codecpar->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;
int64_t 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 %"PRIu32".\n", tag_bytes);
return 0;
}
fields = avio_rl32(pb); /* number of fields */
if (fields > 65536) {
av_log(s, AV_LOG_ERROR, "Too many tag fields (%"PRIu32")\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);
if (val & APE_TAG_FLAG_CONTAINS_HEADER)
tag_bytes += APE_TAG_HEADER_BYTES;
tag_start = file_size - tag_bytes;
for (i=0; i<fields; i++)
if (ape_tag_read_field(s) < 0) break;
return tag_start;
}
static int string_is_ascii(const uint8_t *str)
{
while (*str && *str >= 0x20 && *str <= 0x7e ) str++;
return !*str;
}
int ff_ape_write_tag(AVFormatContext *s)
{
AVDictionaryEntry *e = NULL;
int size, ret, count = 0;
AVIOContext *dyn_bc;
uint8_t *dyn_buf;
if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
return ret;
ff_standardize_creation_time(s);
while ((e = av_dict_get(s->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
int val_len;
if (!string_is_ascii(e->key)) {
av_log(s, AV_LOG_WARNING, "Non ASCII keys are not allowed\n");
continue;
}
val_len = strlen(e->value);
avio_wl32(dyn_bc, val_len); // value length
avio_wl32(dyn_bc, 0); // item flags
avio_put_str(dyn_bc, e->key); // key
avio_write(dyn_bc, e->value, val_len); // value
count++;
}
if (!count)
goto end;
size = avio_get_dyn_buf(dyn_bc, &dyn_buf);
if (size <= 0)
goto end;
size += APE_TAG_FOOTER_BYTES;
// header
avio_write(s->pb, "APETAGEX", 8); // id
avio_wl32(s->pb, APE_TAG_VERSION); // version
avio_wl32(s->pb, size);
avio_wl32(s->pb, count);
// flags
avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_IS_HEADER);
ffio_fill(s->pb, 0, 8); // reserved
avio_write(s->pb, dyn_buf, size - APE_TAG_FOOTER_BYTES);
// footer
avio_write(s->pb, "APETAGEX", 8); // id
avio_wl32(s->pb, APE_TAG_VERSION); // version
avio_wl32(s->pb, size); // size
avio_wl32(s->pb, count); // tag count
// flags
avio_wl32(s->pb, APE_TAG_FLAG_CONTAINS_HEADER);
ffio_fill(s->pb, 0, 8); // reserved
end:
ffio_free_dyn_buf(&dyn_bc);
return ret;
}