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Linshizhi
ffmpeg.wasm-core
Commits
63fd0d86
Commit
63fd0d86
authored
Jun 24, 2014
by
Anton Khirnov
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output example: allocate the audio frame only once
parent
edd5f957
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1 changed file
with
23 additions
and
26 deletions
+23
-26
output.c
doc/examples/output.c
+23
-26
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doc/examples/output.c
View file @
63fd0d86
...
@@ -55,7 +55,6 @@ typedef struct OutputStream {
...
@@ -55,7 +55,6 @@ typedef struct OutputStream {
AVFrame
*
tmp_frame
;
AVFrame
*
tmp_frame
;
float
t
,
tincr
,
tincr2
;
float
t
,
tincr
,
tincr2
;
int
audio_input_frame_size
;
}
OutputStream
;
}
OutputStream
;
/**************************************************************/
/**************************************************************/
...
@@ -100,6 +99,7 @@ static void add_audio_stream(OutputStream *ost, AVFormatContext *oc,
...
@@ -100,6 +99,7 @@ static void add_audio_stream(OutputStream *ost, AVFormatContext *oc,
static
void
open_audio
(
AVFormatContext
*
oc
,
OutputStream
*
ost
)
static
void
open_audio
(
AVFormatContext
*
oc
,
OutputStream
*
ost
)
{
{
AVCodecContext
*
c
;
AVCodecContext
*
c
;
int
ret
;
c
=
ost
->
st
->
codec
;
c
=
ost
->
st
->
codec
;
...
@@ -115,10 +115,24 @@ static void open_audio(AVFormatContext *oc, OutputStream *ost)
...
@@ -115,10 +115,24 @@ static void open_audio(AVFormatContext *oc, OutputStream *ost)
/* increment frequency by 110 Hz per second */
/* increment frequency by 110 Hz per second */
ost
->
tincr2
=
2
*
M_PI
*
110
.
0
/
c
->
sample_rate
/
c
->
sample_rate
;
ost
->
tincr2
=
2
*
M_PI
*
110
.
0
/
c
->
sample_rate
/
c
->
sample_rate
;
ost
->
frame
=
av_frame_alloc
();
if
(
!
ost
->
frame
)
exit
(
1
);
ost
->
frame
->
sample_rate
=
c
->
sample_rate
;
ost
->
frame
->
format
=
AV_SAMPLE_FMT_S16
;
ost
->
frame
->
channel_layout
=
c
->
channel_layout
;
if
(
c
->
codec
->
capabilities
&
CODEC_CAP_VARIABLE_FRAME_SIZE
)
if
(
c
->
codec
->
capabilities
&
CODEC_CAP_VARIABLE_FRAME_SIZE
)
ost
->
audio_input_frame_size
=
10000
;
ost
->
frame
->
nb_samples
=
10000
;
else
else
ost
->
audio_input_frame_size
=
c
->
frame_size
;
ost
->
frame
->
nb_samples
=
c
->
frame_size
;
ret
=
av_frame_get_buffer
(
ost
->
frame
,
0
);
if
(
ret
<
0
)
{
fprintf
(
stderr
,
"Could not allocate an audio frame.
\n
"
);
exit
(
1
);
}
}
}
/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
...
@@ -149,25 +163,14 @@ static void write_audio_frame(AVFormatContext *oc, OutputStream *ost)
...
@@ -149,25 +163,14 @@ static void write_audio_frame(AVFormatContext *oc, OutputStream *ost)
{
{
AVCodecContext
*
c
;
AVCodecContext
*
c
;
AVPacket
pkt
=
{
0
};
// data and size must be 0;
AVPacket
pkt
=
{
0
};
// data and size must be 0;
AVFrame
*
frame
=
av_frame_alloc
();
int
got_packet
,
ret
;
int
got_packet
,
ret
;
av_init_packet
(
&
pkt
);
av_init_packet
(
&
pkt
);
c
=
ost
->
st
->
codec
;
c
=
ost
->
st
->
codec
;
frame
->
sample_rate
=
c
->
sample_rate
;
get_audio_frame
(
ost
,
ost
->
frame
,
c
->
channels
);
frame
->
nb_samples
=
ost
->
audio_input_frame_size
;
frame
->
format
=
AV_SAMPLE_FMT_S16
;
frame
->
channel_layout
=
c
->
channel_layout
;
ret
=
av_frame_get_buffer
(
frame
,
0
);
if
(
ret
<
0
)
{
fprintf
(
stderr
,
"Could not allocate an audio frame.
\n
"
);
exit
(
1
);
}
get_audio_frame
(
ost
,
frame
,
c
->
channels
);
avcodec_encode_audio2
(
c
,
&
pkt
,
frame
,
&
got_packet
);
avcodec_encode_audio2
(
c
,
&
pkt
,
ost
->
frame
,
&
got_packet
);
if
(
!
got_packet
)
if
(
!
got_packet
)
return
;
return
;
...
@@ -178,12 +181,6 @@ static void write_audio_frame(AVFormatContext *oc, OutputStream *ost)
...
@@ -178,12 +181,6 @@ static void write_audio_frame(AVFormatContext *oc, OutputStream *ost)
fprintf
(
stderr
,
"Error while writing audio frame
\n
"
);
fprintf
(
stderr
,
"Error while writing audio frame
\n
"
);
exit
(
1
);
exit
(
1
);
}
}
av_frame_free
(
&
frame
);
}
static
void
close_audio
(
AVFormatContext
*
oc
,
OutputStream
*
ost
)
{
avcodec_close
(
ost
->
st
->
codec
);
}
}
/**************************************************************/
/**************************************************************/
...
@@ -399,7 +396,7 @@ static void write_video_frame(AVFormatContext *oc, OutputStream *ost)
...
@@ -399,7 +396,7 @@ static void write_video_frame(AVFormatContext *oc, OutputStream *ost)
frame_count
++
;
frame_count
++
;
}
}
static
void
close_
video
(
AVFormatContext
*
oc
,
OutputStream
*
ost
)
static
void
close_
stream
(
AVFormatContext
*
oc
,
OutputStream
*
ost
)
{
{
avcodec_close
(
ost
->
st
->
codec
);
avcodec_close
(
ost
->
st
->
codec
);
av_frame_free
(
&
ost
->
frame
);
av_frame_free
(
&
ost
->
frame
);
...
@@ -411,7 +408,7 @@ static void close_video(AVFormatContext *oc, OutputStream *ost)
...
@@ -411,7 +408,7 @@ static void close_video(AVFormatContext *oc, OutputStream *ost)
int
main
(
int
argc
,
char
**
argv
)
int
main
(
int
argc
,
char
**
argv
)
{
{
OutputStream
video_st
,
audio_st
;
OutputStream
video_st
=
{
0
},
audio_st
=
{
0
}
;
const
char
*
filename
;
const
char
*
filename
;
AVOutputFormat
*
fmt
;
AVOutputFormat
*
fmt
;
AVFormatContext
*
oc
;
AVFormatContext
*
oc
;
...
@@ -517,9 +514,9 @@ int main(int argc, char **argv)
...
@@ -517,9 +514,9 @@ int main(int argc, char **argv)
/* Close each codec. */
/* Close each codec. */
if
(
have_video
)
if
(
have_video
)
close_
video
(
oc
,
&
video_st
);
close_
stream
(
oc
,
&
video_st
);
if
(
have_audio
)
if
(
have_audio
)
close_
audio
(
oc
,
&
audio_st
);
close_
stream
(
oc
,
&
audio_st
);
/* Free the streams. */
/* Free the streams. */
for
(
i
=
0
;
i
<
oc
->
nb_streams
;
i
++
)
{
for
(
i
=
0
;
i
<
oc
->
nb_streams
;
i
++
)
{
...
...
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