generic-library/ffmpeg
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Generalize ID3v2 functions to support ID3v2-like ID headers with a

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different magic in the header (mainly targeted to Sony's .oma/.aa3
format).

Patch by Michael Karcher, ffmpeg A mkarcher dialup fu-berlin de

Originally committed as revision 23583 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Karcher 2010-06-11 13:44:57 +00:00 committed by Carl Eugen Hoyos
parent 1c1697117d
commit 3a1350e8d9
7 changed files with 29 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
libavformat/flacdec.c
View File

@ -43,7 +43,7 @@ static int flac_read_header(AVFormatContext *s,
/* skip ID3v2 header if found */
ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
if (ret == ID3v2_HEADER_SIZE && ff_id3v2_match(buf)) {
if (ret == ID3v2_HEADER_SIZE && ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
int len = ff_id3v2_tag_len(buf);
url_fseek(s->pb, len - ID3v2_HEADER_SIZE, SEEK_CUR);
} else {
@ -130,7 +130,7 @@ static int flac_probe(AVProbeData *p)
uint8_t *bufptr = p->buf;
uint8_t *end = p->buf + p->buf_size;
if(ff_id3v2_match(bufptr))
if(ff_id3v2_match(bufptr, ID3v2_DEFAULT_MAGIC))
bufptr += ff_id3v2_tag_len(bufptr);
if(bufptr > end-4 || memcmp(bufptr, "fLaC", 4)) return 0;

13
libavformat/id3v2.c
View File

@ -22,12 +22,13 @@
#include "id3v2.h"
#include "id3v1.h"
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
int ff_id3v2_match(const uint8_t *buf)
int ff_id3v2_match(const uint8_t *buf, const char * magic)
{
return buf[0] == 'I' &&
buf[1] == 'D' &&
buf[2] == '3' &&
return buf[0] == magic[0] &&
buf[1] == magic[1] &&
buf[2] == magic[2] &&
buf[3] != 0xff &&
buf[4] != 0xff &&
(buf[6] & 0x80) == 0 &&
@ -48,7 +49,7 @@ int ff_id3v2_tag_len(const uint8_t * buf)
return len;
}
void ff_id3v2_read(AVFormatContext *s)
void ff_id3v2_read(AVFormatContext *s, const char *magic)
{
int len, ret;
uint8_t buf[ID3v2_HEADER_SIZE];
@ -56,7 +57,7 @@ void ff_id3v2_read(AVFormatContext *s)
ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
if (ret != ID3v2_HEADER_SIZE)
return;
if (ff_id3v2_match(buf)) {
if (ff_id3v2_match(buf, magic)) {
/* parse ID3v2 header */
len = ((buf[6] & 0x7f) << 21) |
((buf[7] & 0x7f) << 14) |

15
libavformat/id3v2.h
View File

@ -29,10 +29,17 @@
#define ID3v2_HEADER_SIZE 10
/**
* Detects ID3v2 Header.
* @buf must be ID3v2_HEADER_SIZE byte long
* Default magic bytes for ID3v2 header: "ID3"
*/
int ff_id3v2_match(const uint8_t *buf);
#define ID3v2_DEFAULT_MAGIC "ID3"
/**
* Detects ID3v2 Header.
* @buf must be ID3v2_HEADER_SIZE byte long
* @magic magic bytes to identify the header, machine byte order.
* If in doubt, use ID3v2_DEFAULT_MAGIC.
*/
int ff_id3v2_match(const uint8_t *buf, const char *magic);
/**
* Gets the length of an ID3v2 tag.
@ -50,7 +57,7 @@ void ff_id3v2_parse(AVFormatContext *s, int len, uint8_t version, uint8_t flags)
/**
* Read an ID3v2 tag
*/
void ff_id3v2_read(AVFormatContext *s);
void ff_id3v2_read(AVFormatContext *s, const char *magic);
extern const AVMetadataConv ff_id3v2_metadata_conv[];

4
libavformat/mp3.c
View File

@ -42,7 +42,7 @@ static int mp3_read_probe(AVProbeData *p)
AVCodecContext avctx;
buf0 = p->buf;
if(ff_id3v2_match(buf0)) {
if(ff_id3v2_match(buf0, ID3v2_DEFAULT_MAGIC)) {
buf0 += ff_id3v2_tag_len(buf0);
}
end = p->buf + p->buf_size - sizeof(uint32_t);
@ -148,7 +148,7 @@ static int mp3_read_header(AVFormatContext *s,
// lcm of all mp3 sample rates
av_set_pts_info(st, 64, 1, 14112000);
ff_id3v2_read(s);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC);
off = url_ftell(s->pb);
if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))

6
libavformat/mpc.c
View File

@ -45,7 +45,7 @@ typedef struct {
static int mpc_probe(AVProbeData *p)
{
const uint8_t *d = p->buf;
if (ff_id3v2_match(d)) {
if (ff_id3v2_match(d, ID3v2_DEFAULT_MAGIC)) {
d += ff_id3v2_tag_len(d);
}
if (d+3 < p->buf+p->buf_size)
@ -67,7 +67,7 @@ static int mpc_read_header(AVFormatContext *s, AVFormatParameters *ap)
if (url_fseek(s->pb, pos, SEEK_SET) < 0)
return -1;
ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE);
if (ret != ID3v2_HEADER_SIZE || !ff_id3v2_match(buf)) {
if (ret != ID3v2_HEADER_SIZE || !ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
return -1;
}
@ -82,7 +82,7 @@ static int mpc_read_header(AVFormatContext *s, AVFormatParameters *ap)
/* read ID3 tags */
if (url_fseek(s->pb, pos, SEEK_SET) < 0)
return -1;
ff_id3v2_read(s);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC);
get_le24(s->pb);
}
c->ver = get_byte(s->pb);

4
libavformat/raw.c
View File

@ -664,7 +664,7 @@ static int adts_aac_probe(AVProbeData *p)
uint8_t *buf;
uint8_t *end = buf0 + p->buf_size - 7;
if (ff_id3v2_match(buf0)) {
if (ff_id3v2_match(buf0, ID3v2_DEFAULT_MAGIC)) {
buf0 += ff_id3v2_tag_len(buf0);
}
buf = buf0;
@ -706,7 +706,7 @@ static int adts_aac_read_header(AVFormatContext *s,
st->need_parsing = AVSTREAM_PARSE_FULL;
ff_id3v1_read(s);
ff_id3v2_read(s);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC);
return 0;
}

4
libavformat/tta.c
View File

@ -32,7 +32,7 @@ static int tta_probe(AVProbeData *p)
{
const uint8_t *d = p->buf;
if (ff_id3v2_match(d))
if (ff_id3v2_match(d, ID3v2_DEFAULT_MAGIC))
d += ff_id3v2_tag_len(d);
if (d - p->buf >= p->buf_size)
@ -50,7 +50,7 @@ static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap)
int i, channels, bps, samplerate, datalen, framelen;
uint64_t framepos, start_offset;
ff_id3v2_read(s);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC);
if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
ff_id3v1_read(s);