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Stefan Westerfeld
ffmpeg
Commits
0711d142
Commit
0711d142
authored
Feb 27, 2018
by
Andreas Unterweger
Committed by
Diego Biurrun
Mar 07, 2018
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examples: Use new API for transcoding example
Signed-off-by:
Diego Biurrun
<
diego@biurrun.de
>
parent
aeaa108b
Changes
1
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69 additions
and
32 deletions
+69
-32
transcode_aac.c
doc/examples/transcode_aac.c
+69
-32
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doc/examples/transcode_aac.c
View file @
0711d142
/*
* Copyright (c) 2013-201
7
Andreas Unterweger
* Copyright (c) 2013-201
8
Andreas Unterweger
*
* This file is part of Libav.
*
...
...
@@ -398,24 +398,39 @@ static int decode_audio_frame(AVFrame *frame,
}
}
/* Decode the audio frame stored in the temporary packet.
* The input audio stream decoder is used to do this.
* If we are at the end of the file, pass an empty packet to the decoder
* to flush it. */
if
((
error
=
avcodec_decode_audio4
(
input_codec_context
,
frame
,
data_present
,
&
input_packet
))
<
0
)
{
fprintf
(
stderr
,
"Could not decode frame (error '%s')
\n
"
,
/* Send the audio frame stored in the temporary packet to the decoder.
* The input audio stream decoder is used to do this. */
if
((
error
=
avcodec_send_packet
(
input_codec_context
,
&
input_packet
))
<
0
)
{
fprintf
(
stderr
,
"Could not send packet for decoding (error '%s')
\n
"
,
get_error_text
(
error
));
av_packet_unref
(
&
input_packet
);
return
error
;
}
/* If the decoder has not been flushed completely, we are not finished,
* so that this function has to be called again. */
if
(
*
finished
&&
*
data_present
)
*
finished
=
0
;
/* Receive one frame from the decoder. */
error
=
avcodec_receive_frame
(
input_codec_context
,
frame
);
/* If the decoder asks for more data to be able to decode a frame,
* return indicating that no data is present. */
if
(
error
==
AVERROR
(
EAGAIN
))
{
error
=
0
;
goto
cleanup
;
/* If the end of the input file is reached, stop decoding. */
}
else
if
(
error
==
AVERROR_EOF
)
{
*
finished
=
1
;
error
=
0
;
goto
cleanup
;
}
else
if
(
error
<
0
)
{
fprintf
(
stderr
,
"Could not decode frame (error '%s')
\n
"
,
get_error_text
(
error
));
goto
cleanup
;
/* Default case: Return decoded data. */
}
else
{
*
data_present
=
1
;
goto
cleanup
;
}
cleanup:
av_packet_unref
(
&
input_packet
);
return
0
;
return
error
;
}
/**
...
...
@@ -556,7 +571,7 @@ static int read_decode_convert_and_store(AVAudioFifo *fifo,
AVFrame
*
input_frame
=
NULL
;
/* Temporary storage for the converted input samples. */
uint8_t
**
converted_input_samples
=
NULL
;
int
data_present
;
int
data_present
=
0
;
int
ret
=
AVERROR_EXIT
;
/* Initialize temporary storage for one input frame. */
...
...
@@ -569,7 +584,7 @@ static int read_decode_convert_and_store(AVAudioFifo *fifo,
/* If we are at the end of the file and there are no more samples
* in the decoder which are delayed, we are actually finished.
* This must not be treated as an error. */
if
(
*
finished
&&
!
data_present
)
{
if
(
*
finished
)
{
ret
=
0
;
goto
cleanup
;
}
...
...
@@ -655,7 +670,7 @@ static int64_t pts = 0;
* @param output_format_context Format context of the output file
* @param output_codec_context Codec context of the output file
* @param[out] data_present Indicates whether data has been
*
de
coded
*
en
coded
* @return Error code (0 if successful)
*/
static
int
encode_audio_frame
(
AVFrame
*
frame
,
...
...
@@ -674,29 +689,50 @@ static int encode_audio_frame(AVFrame *frame,
pts
+=
frame
->
nb_samples
;
}
/*
Encode the audio frame and store it in the temporary packet
.
/*
Send the audio frame stored in the temporary packet to the encoder
.
* The output audio stream encoder is used to do this. */
if
((
error
=
avcodec_encode_audio2
(
output_codec_context
,
&
output_packet
,
frame
,
data_present
))
<
0
)
{
fprintf
(
stderr
,
"Could not encode frame (error '%s')
\n
"
,
error
=
avcodec_send_frame
(
output_codec_context
,
frame
);
/* The encoder signals that it has nothing more to encode. */
if
(
error
==
AVERROR_EOF
)
{
error
=
0
;
goto
cleanup
;
}
else
if
(
error
<
0
)
{
fprintf
(
stderr
,
"Could not send packet for encoding (error '%s')
\n
"
,
get_error_text
(
error
));
av_packet_unref
(
&
output_packet
);
return
error
;
}
/* Write one audio frame from the temporary packet to the output file. */
if
(
*
data_present
)
{
if
((
error
=
av_write_frame
(
output_format_context
,
&
output_packet
))
<
0
)
{
fprintf
(
stderr
,
"Could not write frame (error '%s')
\n
"
,
get_error_text
(
error
));
av_packet_unref
(
&
output_packet
);
return
error
;
}
/* Receive one encoded frame from the encoder. */
error
=
avcodec_receive_packet
(
output_codec_context
,
&
output_packet
);
/* If the encoder asks for more data to be able to provide an
* encoded frame, return indicating that no data is present. */
if
(
error
==
AVERROR
(
EAGAIN
))
{
error
=
0
;
goto
cleanup
;
/* If the last frame has been encoded, stop encoding. */
}
else
if
(
error
==
AVERROR_EOF
)
{
error
=
0
;
goto
cleanup
;
}
else
if
(
error
<
0
)
{
fprintf
(
stderr
,
"Could not encode frame (error '%s')
\n
"
,
get_error_text
(
error
));
goto
cleanup
;
/* Default case: Return encoded data. */
}
else
{
*
data_present
=
1
;
}
av_packet_unref
(
&
output_packet
);
/* Write one audio frame from the temporary packet to the output file. */
if
(
*
data_present
&&
(
error
=
av_write_frame
(
output_format_context
,
&
output_packet
))
<
0
)
{
fprintf
(
stderr
,
"Could not write frame (error '%s')
\n
"
,
get_error_text
(
error
));
goto
cleanup
;
}
return
0
;
cleanup:
av_packet_unref
(
&
output_packet
);
return
error
;
}
/**
...
...
@@ -836,6 +872,7 @@ int main(int argc, char **argv)
int
data_written
;
/* Flush the encoder as it may have delayed frames. */
do
{
data_written
=
0
;
if
(
encode_audio_frame
(
NULL
,
output_format_context
,
output_codec_context
,
&
data_written
))
goto
cleanup
;
...
...
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