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examples: Use new API for transcoding example

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Signed-off-by: Diego Biurrun <diego@biurrun.de>
This commit is contained in:
Andreas Unterweger 2018-02-27 17:48:03 +01:00 committed by Diego Biurrun
parent aeaa108baf
commit 0711d14299
1 changed files with 70 additions and 33 deletions
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103
doc/examples/transcode_aac.c
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@ -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;
}
av_packet_unref(&output_packet);
/* 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;
}
return 0;
/* 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;
}
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;