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Diffstat (limited to 'libavformat/id3v2.c')
-rw-r--r--libavformat/id3v2.c187
1 files changed, 157 insertions, 30 deletions
diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c
index e5f7486e1d..4bc76a321c 100644
--- a/libavformat/id3v2.c
+++ b/libavformat/id3v2.c
@@ -1,24 +1,37 @@
/*
- * ID3v2 header parser
* Copyright (c) 2003 Fabrice Bellard
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+/**
+ * @file
+ * ID3v2 header parser
+ *
+ * Specifications available at:
+ * http://id3.org/Developer_Information
+ */
+
+#include "config.h"
+
+#if CONFIG_ZLIB
+#include <zlib.h>
+#endif
+
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/intreadwrite.h"
@@ -258,7 +271,7 @@ static int decode_str(AVFormatContext *s, AVIOContext *pb, int encoding,
* Parse a text tag.
*/
static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen,
- const char *key)
+ AVDictionary **metadata, const char *key)
{
uint8_t *dst;
int encoding, dict_flags = AV_DICT_DONT_OVERWRITE | AV_DICT_DONT_STRDUP_VAL;
@@ -293,7 +306,7 @@ static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen,
av_freep(&dst);
if (dst)
- av_dict_set(&s->metadata, key, dst, dict_flags);
+ av_dict_set(metadata, key, dst, dict_flags);
}
/**
@@ -487,7 +500,7 @@ static void read_apic(AVFormatContext *s, AVIOContext *pb, int taglen,
}
apic->buf = av_buffer_alloc(taglen + FF_INPUT_BUFFER_PADDING_SIZE);
- if (!apic->buf || avio_read(pb, apic->buf->data, taglen) != taglen)
+ if (!apic->buf || !taglen || avio_read(pb, apic->buf->data, taglen) != taglen)
goto fail;
memset(apic->buf->data + taglen, 0, FF_INPUT_BUFFER_PADDING_SIZE);
@@ -505,6 +518,53 @@ fail:
avio_seek(pb, end, SEEK_SET);
}
+static void read_chapter(AVFormatContext *s, AVIOContext *pb, int len, char *ttag, ID3v2ExtraMeta **extra_meta)
+{
+ AVRational time_base = {1, 1000};
+ uint32_t start, end;
+ AVChapter *chapter;
+ uint8_t *dst = NULL;
+ int taglen;
+ char tag[5];
+
+ if (decode_str(s, pb, 0, &dst, &len) < 0)
+ return;
+ if (len < 16)
+ return;
+
+ start = avio_rb32(pb);
+ end = avio_rb32(pb);
+ avio_skip(pb, 8);
+
+ chapter = avpriv_new_chapter(s, s->nb_chapters + 1, time_base, start, end, dst);
+ if (!chapter) {
+ av_free(dst);
+ return;
+ }
+
+ len -= 16;
+ while (len > 10) {
+ avio_read(pb, tag, 4);
+ tag[4] = 0;
+ taglen = avio_rb32(pb);
+ avio_skip(pb, 2);
+ len -= 10;
+ if (taglen < 0 || taglen > len) {
+ av_free(dst);
+ return;
+ }
+ if (tag[0] == 'T')
+ read_ttag(s, pb, taglen, &chapter->metadata, tag);
+ else
+ avio_skip(pb, taglen);
+ len -= taglen;
+ }
+
+ ff_metadata_conv(&chapter->metadata, NULL, ff_id3v2_34_metadata_conv);
+ ff_metadata_conv(&chapter->metadata, NULL, ff_id3v2_4_metadata_conv);
+ av_free(dst);
+}
+
typedef struct ID3v2EMFunc {
const char *tag3;
const char *tag4;
@@ -516,6 +576,7 @@ typedef struct ID3v2EMFunc {
static const ID3v2EMFunc id3v2_extra_meta_funcs[] = {
{ "GEO", "GEOB", read_geobtag, free_geobtag },
{ "PIC", "APIC", read_apic, free_apic },
+ { "CHAP","CHAP", read_chapter, NULL },
{ NULL }
};
@@ -528,7 +589,7 @@ static const ID3v2EMFunc *get_extra_meta_func(const char *tag, int isv34)
{
int i = 0;
while (id3v2_extra_meta_funcs[i].tag3) {
- if (!memcmp(tag,
+ if (tag && !memcmp(tag,
(isv34 ? id3v2_extra_meta_funcs[i].tag4 :
id3v2_extra_meta_funcs[i].tag3),
(isv34 ? 4 : 3)))
@@ -541,7 +602,8 @@ static const ID3v2EMFunc *get_extra_meta_func(const char *tag, int isv34)
static void id3v2_parse(AVFormatContext *s, int len, uint8_t version,
uint8_t flags, ID3v2ExtraMeta **extra_meta)
{
- int isv34, tlen, unsync;
+ int isv34, unsync;
+ unsigned tlen;
char tag[5];
int64_t next, end = avio_tell(s->pb) + len;
int taghdrlen;
@@ -550,7 +612,11 @@ static void id3v2_parse(AVFormatContext *s, int len, uint8_t version,
AVIOContext *pbx;
unsigned char *buffer = NULL;
int buffer_size = 0;
- const ID3v2EMFunc *extra_func;
+ const ID3v2EMFunc *extra_func = NULL;
+ unsigned char *uncompressed_buffer = NULL;
+ int uncompressed_buffer_size = 0;
+
+ av_log(s, AV_LOG_DEBUG, "id3v2 ver:%d flags:%02X len:%d\n", version, flags, len);
switch (version) {
case 2:
@@ -586,11 +652,19 @@ static void id3v2_parse(AVFormatContext *s, int len, uint8_t version,
goto error;
}
avio_skip(s->pb, extlen);
+ len -= extlen + 4;
+ if (len < 0) {
+ reason = "extended header too long.";
+ goto error;
+ }
}
while (len >= taghdrlen) {
unsigned int tflags = 0;
int tunsync = 0;
+ int tcomp = 0;
+ int tencr = 0;
+ unsigned long dlen;
if (isv34) {
avio_read(s->pb, tag, 4);
@@ -606,13 +680,13 @@ static void id3v2_parse(AVFormatContext *s, int len, uint8_t version,
tag[3] = 0;
tlen = avio_rb24(s->pb);
}
- if (tlen < 0 || tlen > len - taghdrlen) {
- av_log(s, AV_LOG_WARNING,
- "Invalid size in frame %s, skipping the rest of tag.\n",
- tag);
+ if (tlen > (1<<28))
break;
- }
len -= taghdrlen + tlen;
+
+ if (len < 0)
+ break;
+
next = avio_tell(s->pb) + tlen;
if (!tlen) {
@@ -623,30 +697,50 @@ static void id3v2_parse(AVFormatContext *s, int len, uint8_t version,
}
if (tflags & ID3v2_FLAG_DATALEN) {
- avio_rb32(s->pb);
+ if (tlen < 4)
+ break;
+ dlen = avio_rb32(s->pb);
tlen -= 4;
- }
+ } else
+ dlen = tlen;
+
+ tcomp = tflags & ID3v2_FLAG_COMPRESSION;
+ tencr = tflags & ID3v2_FLAG_ENCRYPTION;
+
+ /* skip encrypted tags and, if no zlib, compressed tags */
+ if (tencr || (!CONFIG_ZLIB && tcomp)) {
+ const char *type;
+ if (!tcomp)
+ type = "encrypted";
+ else if (!tencr)
+ type = "compressed";
+ else
+ type = "encrypted and compressed";
- if (tflags & (ID3v2_FLAG_ENCRYPTION | ID3v2_FLAG_COMPRESSION)) {
- av_log(s, AV_LOG_WARNING,
- "Skipping encrypted/compressed ID3v2 frame %s.\n", tag);
+ av_log(s, AV_LOG_WARNING, "Skipping %s ID3v2 frame %s.\n", type, tag);
avio_skip(s->pb, tlen);
/* check for text tag or supported special meta tag */
} else if (tag[0] == 'T' ||
(extra_meta &&
(extra_func = get_extra_meta_func(tag, isv34)))) {
- if (unsync || tunsync) {
- int64_t end = avio_tell(s->pb) + tlen;
- uint8_t *b;
+ pbx = s->pb;
+
+ if (unsync || tunsync || tcomp) {
av_fast_malloc(&buffer, &buffer_size, tlen);
if (!buffer) {
av_log(s, AV_LOG_ERROR, "Failed to alloc %d bytes\n", tlen);
goto seek;
}
+ }
+ if (unsync || tunsync) {
+ int64_t end = avio_tell(s->pb) + tlen;
+ uint8_t *b;
+
b = buffer;
- while (avio_tell(s->pb) < end && !s->pb->eof_reached) {
+ while (avio_tell(s->pb) < end && b - buffer < tlen && !s->pb->eof_reached) {
*b++ = avio_r8(s->pb);
if (*(b - 1) == 0xff && avio_tell(s->pb) < end - 1 &&
+ b - buffer < tlen &&
!s->pb->eof_reached ) {
uint8_t val = avio_r8(s->pb);
*b++ = val ? val : avio_r8(s->pb);
@@ -656,18 +750,48 @@ static void id3v2_parse(AVFormatContext *s, int len, uint8_t version,
NULL);
tlen = b - buffer;
pbx = &pb; // read from sync buffer
- } else {
- pbx = s->pb; // read straight from input
}
+
+#if CONFIG_ZLIB
+ if (tcomp) {
+ int err;
+
+ av_log(s, AV_LOG_DEBUG, "Compresssed frame %s tlen=%d dlen=%ld\n", tag, tlen, dlen);
+
+ av_fast_malloc(&uncompressed_buffer, &uncompressed_buffer_size, dlen);
+ if (!uncompressed_buffer) {
+ av_log(s, AV_LOG_ERROR, "Failed to alloc %ld bytes\n", dlen);
+ goto seek;
+ }
+
+ if (!(unsync || tunsync)) {
+ err = avio_read(s->pb, buffer, tlen);
+ if (err < 0) {
+ av_log(s, AV_LOG_ERROR, "Failed to read compressed tag\n");
+ goto seek;
+ }
+ tlen = err;
+ }
+
+ err = uncompress(uncompressed_buffer, &dlen, buffer, tlen);
+ if (err != Z_OK) {
+ av_log(s, AV_LOG_ERROR, "Failed to uncompress tag: %d\n", err);
+ goto seek;
+ }
+ ffio_init_context(&pb, uncompressed_buffer, dlen, 0, NULL, NULL, NULL, NULL);
+ tlen = dlen;
+ pbx = &pb; // read from sync buffer
+ }
+#endif
if (tag[0] == 'T')
/* parse text tag */
- read_ttag(s, pbx, tlen, tag);
+ read_ttag(s, pbx, tlen, &s->metadata, tag);
else
/* parse special meta tag */
extra_func->read(s, pbx, tlen, tag, extra_meta);
} else if (!tag[0]) {
if (tag[1])
- av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding");
+ av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding\n");
avio_skip(s->pb, tlen);
break;
}
@@ -686,6 +810,7 @@ error:
version, reason);
avio_seek(s->pb, end, SEEK_SET);
av_free(buffer);
+ av_free(uncompressed_buffer);
return;
}
@@ -701,8 +826,10 @@ void ff_id3v2_read(AVFormatContext *s, const char *magic,
/* save the current offset in case there's nothing to read/skip */
off = avio_tell(s->pb);
ret = avio_read(s->pb, buf, ID3v2_HEADER_SIZE);
- if (ret != ID3v2_HEADER_SIZE)
+ if (ret != ID3v2_HEADER_SIZE) {
+ avio_seek(s->pb, off, SEEK_SET);
break;
+ }
found_header = ff_id3v2_match(buf, magic);
if (found_header) {
/* parse ID3v2 header */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 13:15:16 +0000