[FFmpeg-cvslog] examples: Use new API for transcoding example
Andreas Unterweger
git at videolan.org
Thu Mar 15 22:59:30 EET 2018
ffmpeg | branch: master | Andreas Unterweger <dustsigns at gmail.com> | Tue Feb 27 17:48:03 2018 +0100| [0711d142997b2662ba9198e607015b06c6eed0d8] | committer: Diego Biurrun
examples: Use new API for transcoding example
Signed-off-by: Diego Biurrun <diego at biurrun.de>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0711d142997b2662ba9198e607015b06c6eed0d8
---
doc/examples/transcode_aac.c | 101 +++++++++++++++++++++++++++++--------------
1 file changed, 69 insertions(+), 32 deletions(-)
diff --git a/doc/examples/transcode_aac.c b/doc/examples/transcode_aac.c
index 44d5af6b04..ec55776857 100644
--- a/doc/examples/transcode_aac.c
+++ b/doc/examples/transcode_aac.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2013-2017 Andreas Unterweger
+ * Copyright (c) 2013-2018 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
- * decoded
+ * encoded
* @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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