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libavformat
oggparsespeex.c
Go to the documentation of this file.
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/*
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Copyright (C) 2008 Reimar Döffinger
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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**/
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#include <stdlib.h>
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#include "
libavutil/bswap.h
"
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#include "
libavutil/avstring.h
"
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#include "
libavcodec/get_bits.h
"
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#include "
libavcodec/bytestream.h
"
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#include "
avformat.h
"
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#include "
internal.h
"
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#include "
oggdec.h
"
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struct
speex_params
{
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int
packet_size
;
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int
final_packet_duration
;
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int
seq
;
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};
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static
int
speex_header
(
AVFormatContext
*s,
int
idx) {
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struct
ogg
*
ogg
= s->
priv_data
;
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struct
ogg_stream
*os = ogg->
streams
+ idx;
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struct
speex_params
*spxp = os->
private
;
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AVStream
*st = s->
streams
[idx];
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uint8_t *p = os->
buf
+ os->
pstart
;
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if
(!spxp) {
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spxp =
av_mallocz
(
sizeof
(*spxp));
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os->
private
= spxp;
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}
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if
(spxp->
seq
> 1)
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return
0;
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if
(spxp->
seq
== 0) {
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int
frames_per_packet;
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_AUDIO
;
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st->
codec
->
codec_id
=
CODEC_ID_SPEEX
;
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st->
codec
->
sample_rate
=
AV_RL32
(p + 36);
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st->
codec
->
channels
=
AV_RL32
(p + 48);
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spxp->
packet_size
=
AV_RL32
(p + 56);
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frames_per_packet =
AV_RL32
(p + 64);
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if
(frames_per_packet)
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spxp->
packet_size
*= frames_per_packet;
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st->
codec
->
extradata_size
= os->
psize
;
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st->
codec
->
extradata
=
av_malloc
(st->
codec
->
extradata_size
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+
FF_INPUT_BUFFER_PADDING_SIZE
);
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memcpy(st->
codec
->
extradata
, p, st->
codec
->
extradata_size
);
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avpriv_set_pts_info
(st, 64, 1, st->
codec
->
sample_rate
);
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}
else
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ff_vorbis_comment
(s, &st->
metadata
, p, os->
psize
);
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spxp->
seq
++;
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return
1;
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}
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static
int
ogg_page_packets
(
struct
ogg_stream
*os)
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{
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int
i;
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int
packets = 0;
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for
(i = 0; i < os->
nsegs
; i++)
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if
(os->
segments
[i] < 255)
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packets++;
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return
packets;
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}
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static
int
speex_packet
(
AVFormatContext
*s,
int
idx)
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{
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struct
ogg
*
ogg
= s->
priv_data
;
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struct
ogg_stream
*os = ogg->
streams
+ idx;
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struct
speex_params
*spxp = os->
private
;
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int
packet_size
= spxp->
packet_size
;
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if
(os->
flags
&
OGG_FLAG_EOS
&& os->
lastpts
!=
AV_NOPTS_VALUE
&&
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os->
granule
> 0) {
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/* first packet of final page. we have to calculate the final packet
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duration here because it is the only place we know the next-to-last
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granule position. */
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spxp->
final_packet_duration
= os->
granule
- os->
lastpts
-
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packet_size * (
ogg_page_packets
(os) - 1);
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}
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if
(!os->
lastpts
&& os->
granule
> 0)
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/* first packet */
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os->
lastpts
= os->
lastdts
= os->
granule
- packet_size *
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ogg_page_packets
(os);
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if
(os->
flags
&
OGG_FLAG_EOS
&& os->
segp
== os->
nsegs
&&
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spxp->
final_packet_duration
)
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/* final packet */
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os->
pduration
= spxp->
final_packet_duration
;
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else
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os->
pduration
=
packet_size
;
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return
0;
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}
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const
struct
ogg_codec
ff_speex_codec
= {
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.
magic
=
"Speex "
,
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.magicsize = 8,
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.header =
speex_header
,
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.packet =
speex_packet
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};