mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-10 17:41:09 +02:00
![Justin Ruggles](/assets/img/avatar_default.png)
Ogg demuxers. Originally committed as revision 19186 to svn://svn.ffmpeg.org/ffmpeg/trunk
239 lines
6.8 KiB
C
239 lines
6.8 KiB
C
/**
|
|
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
|
|
|
|
Permission is hereby granted, free of charge, to any person
|
|
obtaining a copy of this software and associated documentation
|
|
files (the "Software"), to deal in the Software without
|
|
restriction, including without limitation the rights to use, copy,
|
|
modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be
|
|
included in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
|
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
DEALINGS IN THE SOFTWARE.
|
|
**/
|
|
|
|
#include <stdlib.h>
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/bswap.h"
|
|
#include "libavcodec/get_bits.h"
|
|
#include "libavcodec/bytestream.h"
|
|
#include "avformat.h"
|
|
#include "oggdec.h"
|
|
|
|
/**
|
|
* VorbisComment metadata conversion mapping.
|
|
* from Ogg Vorbis I format specification: comment field and header specification
|
|
* http://xiph.org/vorbis/doc/v-comment.html
|
|
*/
|
|
const AVMetadataConv ff_vorbiscomment_metadata_conv[] = {
|
|
{ "ARTIST" , "author" },
|
|
{ "TITLE" , "title" },
|
|
{ "ALBUM" , "album" },
|
|
{ "DATE" , "year" },
|
|
{ "TRACKNUMBER", "track" },
|
|
{ "GENRE" , "genre" },
|
|
{ 0 }
|
|
};
|
|
|
|
int
|
|
vorbis_comment(AVFormatContext * as, uint8_t *buf, int size)
|
|
{
|
|
const uint8_t *p = buf;
|
|
const uint8_t *end = buf + size;
|
|
unsigned s, n, j;
|
|
|
|
if (size < 8) /* must have vendor_length and user_comment_list_length */
|
|
return -1;
|
|
|
|
s = bytestream_get_le32(&p);
|
|
|
|
if (end - p < s)
|
|
return -1;
|
|
|
|
p += s;
|
|
|
|
n = bytestream_get_le32(&p);
|
|
|
|
while (p < end && n > 0) {
|
|
const char *t, *v;
|
|
int tl, vl;
|
|
|
|
s = bytestream_get_le32(&p);
|
|
|
|
if (end - p < s)
|
|
break;
|
|
|
|
t = p;
|
|
p += s;
|
|
n--;
|
|
|
|
v = memchr(t, '=', s);
|
|
if (!v)
|
|
continue;
|
|
|
|
tl = v - t;
|
|
vl = s - tl - 1;
|
|
v++;
|
|
|
|
if (tl && vl) {
|
|
char *tt, *ct;
|
|
|
|
tt = av_malloc(tl + 1);
|
|
ct = av_malloc(vl + 1);
|
|
if (!tt || !ct) {
|
|
av_freep(&tt);
|
|
av_freep(&ct);
|
|
av_log(as, AV_LOG_WARNING, "out-of-memory error. skipping VorbisComment tag.\n");
|
|
continue;
|
|
}
|
|
|
|
for (j = 0; j < tl; j++)
|
|
tt[j] = toupper(t[j]);
|
|
tt[tl] = 0;
|
|
|
|
memcpy(ct, v, vl);
|
|
ct[vl] = 0;
|
|
|
|
av_metadata_set(&as->metadata, tt, ct);
|
|
|
|
av_freep(&tt);
|
|
av_freep(&ct);
|
|
}
|
|
}
|
|
|
|
if (p != end)
|
|
av_log(as, AV_LOG_INFO, "%ti bytes of comment header remain\n", p-end);
|
|
if (n > 0)
|
|
av_log(as, AV_LOG_INFO,
|
|
"truncated comment header, %i comments not found\n", n);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/** Parse the vorbis header
|
|
* Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
|
|
* [vorbis_version] = read 32 bits as unsigned integer | Not used
|
|
* [audio_channels] = read 8 bit integer as unsigned | Used
|
|
* [audio_sample_rate] = read 32 bits as unsigned integer | Used
|
|
* [bitrate_maximum] = read 32 bits as signed integer | Not used yet
|
|
* [bitrate_nominal] = read 32 bits as signed integer | Not used yet
|
|
* [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
|
|
* [blocksize_0] = read 4 bits as unsigned integer | Not Used
|
|
* [blocksize_1] = read 4 bits as unsigned integer | Not Used
|
|
* [framing_flag] = read one bit | Not Used
|
|
* */
|
|
|
|
struct oggvorbis_private {
|
|
unsigned int len[3];
|
|
unsigned char *packet[3];
|
|
};
|
|
|
|
|
|
static unsigned int
|
|
fixup_vorbis_headers(AVFormatContext * as, struct oggvorbis_private *priv,
|
|
uint8_t **buf)
|
|
{
|
|
int i,offset, len;
|
|
unsigned char *ptr;
|
|
|
|
len = priv->len[0] + priv->len[1] + priv->len[2];
|
|
ptr = *buf = av_mallocz(len + len/255 + 64);
|
|
|
|
ptr[0] = 2;
|
|
offset = 1;
|
|
offset += av_xiphlacing(&ptr[offset], priv->len[0]);
|
|
offset += av_xiphlacing(&ptr[offset], priv->len[1]);
|
|
for (i = 0; i < 3; i++) {
|
|
memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
|
|
offset += priv->len[i];
|
|
}
|
|
*buf = av_realloc(*buf, offset + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
return offset;
|
|
}
|
|
|
|
|
|
static int
|
|
vorbis_header (AVFormatContext * s, int idx)
|
|
{
|
|
struct ogg *ogg = s->priv_data;
|
|
struct ogg_stream *os = ogg->streams + idx;
|
|
AVStream *st = s->streams[idx];
|
|
struct oggvorbis_private *priv;
|
|
|
|
if (os->seq > 2)
|
|
return 0;
|
|
|
|
if (os->seq == 0) {
|
|
os->private = av_mallocz(sizeof(struct oggvorbis_private));
|
|
if (!os->private)
|
|
return 0;
|
|
}
|
|
|
|
if (os->psize < 1)
|
|
return -1;
|
|
|
|
priv = os->private;
|
|
priv->len[os->seq] = os->psize;
|
|
priv->packet[os->seq] = av_mallocz(os->psize);
|
|
memcpy(priv->packet[os->seq], os->buf + os->pstart, os->psize);
|
|
if (os->buf[os->pstart] == 1) {
|
|
const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
|
|
unsigned blocksize, bs0, bs1;
|
|
|
|
if (os->psize != 30)
|
|
return -1;
|
|
|
|
if (bytestream_get_le32(&p) != 0) /* vorbis_version */
|
|
return -1;
|
|
|
|
st->codec->channels = bytestream_get_byte(&p);
|
|
st->codec->sample_rate = bytestream_get_le32(&p);
|
|
p += 4; // skip maximum bitrate
|
|
st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
|
|
p += 4; // skip minimum bitrate
|
|
|
|
blocksize = bytestream_get_byte(&p);
|
|
bs0 = blocksize & 15;
|
|
bs1 = blocksize >> 4;
|
|
|
|
if (bs0 > bs1)
|
|
return -1;
|
|
if (bs0 < 6 || bs1 > 13)
|
|
return -1;
|
|
|
|
if (bytestream_get_byte(&p) != 1) /* framing_flag */
|
|
return -1;
|
|
|
|
st->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
st->codec->codec_id = CODEC_ID_VORBIS;
|
|
|
|
st->time_base.num = 1;
|
|
st->time_base.den = st->codec->sample_rate;
|
|
} else if (os->buf[os->pstart] == 3) {
|
|
if (os->psize > 8)
|
|
vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
|
|
} else {
|
|
st->codec->extradata_size =
|
|
fixup_vorbis_headers(s, priv, &st->codec->extradata);
|
|
}
|
|
|
|
return os->seq < 3;
|
|
}
|
|
|
|
const struct ogg_codec ff_vorbis_codec = {
|
|
.magic = "\001vorbis",
|
|
.magicsize = 7,
|
|
.header = vorbis_header
|
|
};
|