0,0 → 1,240 |
/* |
* 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 "avio_internal.h" |
#include "apetag.h" |
#include "internal.h" |
|
#define APE_TAG_FLAG_CONTAINS_HEADER (1 << 31) |
#define APE_TAG_FLAG_CONTAINS_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; |
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 { |
if (ff_alloc_extradata(st->codec, size)) |
return AVERROR(ENOMEM); |
if (avio_read(pb, st->codec->extradata, size) != size) { |
av_freep(&st->codec->extradata); |
st->codec->extradata_size = 0; |
return AVERROR(EIO); |
} |
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; |
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 %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; |
} |
|
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 = NULL; |
uint8_t *dyn_buf = NULL; |
|
if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0) |
goto end; |
|
// flags |
avio_wl32(dyn_bc, APE_TAG_FLAG_CONTAINS_HEADER | APE_TAG_FLAG_CONTAINS_FOOTER | |
APE_TAG_FLAG_IS_HEADER); |
ffio_fill(dyn_bc, 0, 8); // reserved |
|
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_close_dyn_buf(dyn_bc, &dyn_buf); |
if (size <= 0) |
goto end; |
size += 20; |
|
// 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); |
|
avio_write(s->pb, dyn_buf, size - 20); |
|
// 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 | APE_TAG_FLAG_CONTAINS_FOOTER); |
ffio_fill(s->pb, 0, 8); // reserved |
|
end: |
if (dyn_bc && !dyn_buf) |
avio_close_dyn_buf(dyn_bc, &dyn_buf); |
av_freep(&dyn_buf); |
|
return ret; |
} |