diff options
author | Michael Niedermayer <michaelni@gmx.at> | 2013-11-27 14:15:48 +0400 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2013-11-27 14:15:48 +0400 |
commit | 7497c894cd36f6d3e713ddefeeedbd8d880cc896 (patch) | |
tree | 9b2cd9a87e472b2fb25959f69094edcce19d0b36 /doc/examples/transcode_aac.c | |
parent | 60b099c37100d94e114cefefdd101af831287b9f (diff) |
doc/examples/transcode_aac: switch to swresample
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'doc/examples/transcode_aac.c')
-rw-r--r-- | doc/examples/transcode_aac.c | 78 |
1 files changed, 34 insertions, 44 deletions
diff --git a/doc/examples/transcode_aac.c b/doc/examples/transcode_aac.c index d00e20e0e0..cfed0e16b7 100644 --- a/doc/examples/transcode_aac.c +++ b/doc/examples/transcode_aac.c @@ -30,11 +30,12 @@ #include "libavcodec/avcodec.h" #include "libavutil/audio_fifo.h" +#include "libavutil/avassert.h" #include "libavutil/avstring.h" #include "libavutil/frame.h" #include "libavutil/opt.h" -#include "libavresample/avresample.h" +#include "libswresample/swresample.h" /** The output bit rate in kbit/s */ #define OUTPUT_BIT_RATE 48000 @@ -223,11 +224,11 @@ static int init_input_frame(AVFrame **frame) /** * Initialize the audio resampler based on the input and output codec settings. * If the input and output sample formats differ, a conversion is required - * libavresample takes care of this, but requires initialization. + * libswresample takes care of this, but requires initialization. */ static int init_resampler(AVCodecContext *input_codec_context, AVCodecContext *output_codec_context, - AVAudioResampleContext **resample_context) + SwrContext **resample_context) { /** * Only initialize the resampler if it is necessary, i.e., @@ -237,35 +238,36 @@ static int init_resampler(AVCodecContext *input_codec_context, input_codec_context->channels != output_codec_context->channels) { int error; - /** Create a resampler context for the conversion. */ - if (!(*resample_context = avresample_alloc_context())) { - fprintf(stderr, "Could not allocate resample context\n"); - return AVERROR(ENOMEM); - } - /** + * Create a resampler context for the conversion. * Set the conversion parameters. * Default channel layouts based on the number of channels * are assumed for simplicity (they are sometimes not detected * properly by the demuxer and/or decoder). */ - av_opt_set_int(*resample_context, "in_channel_layout", - av_get_default_channel_layout(input_codec_context->channels), 0); - av_opt_set_int(*resample_context, "out_channel_layout", - av_get_default_channel_layout(output_codec_context->channels), 0); - av_opt_set_int(*resample_context, "in_sample_rate", - input_codec_context->sample_rate, 0); - av_opt_set_int(*resample_context, "out_sample_rate", - output_codec_context->sample_rate, 0); - av_opt_set_int(*resample_context, "in_sample_fmt", - input_codec_context->sample_fmt, 0); - av_opt_set_int(*resample_context, "out_sample_fmt", - output_codec_context->sample_fmt, 0); + *resample_context = swr_alloc_set_opts(NULL, + av_get_default_channel_layout(output_codec_context->channels), + output_codec_context->sample_fmt, + output_codec_context->sample_rate, + av_get_default_channel_layout(input_codec_context->channels), + input_codec_context->sample_fmt, + input_codec_context->sample_rate, + 0, NULL); + if (!*resample_context) { + fprintf(stderr, "Could not allocate resample context\n"); + return AVERROR(ENOMEM); + } + /** + * Perform a sanity check so that the number of converted samples is + * not greater than the number of samples to be converted. + * If the sample rates differ, this case has to be handled differently + */ + av_assert0(output_codec_context->sample_rate == input_codec_context->sample_rate); /** Open the resampler with the specified parameters. */ - if ((error = avresample_open(*resample_context)) < 0) { + if ((error = swr_init(*resample_context)) < 0) { fprintf(stderr, "Could not open resample context\n"); - avresample_free(resample_context); + swr_free(resample_context); return error; } } @@ -387,30 +389,21 @@ static int init_converted_samples(uint8_t ***converted_input_samples, * The conversion happens on a per-frame basis, the size of which is specified * by frame_size. */ -static int convert_samples(uint8_t **input_data, +static int convert_samples(const uint8_t **input_data, uint8_t **converted_data, const int frame_size, - AVAudioResampleContext *resample_context) + SwrContext *resample_context) { int error; /** Convert the samples using the resampler. */ - if ((error = avresample_convert(resample_context, converted_data, 0, - frame_size, input_data, 0, frame_size)) < 0) { + if ((error = swr_convert(resample_context, + converted_data, frame_size, + input_data , frame_size)) < 0) { fprintf(stderr, "Could not convert input samples (error '%s')\n", get_error_text(error)); return error; } - /** - * Perform a sanity check so that the number of converted samples is - * not greater than the number of samples to be converted. - * If the sample rates differ, this case has to be handled differently - */ - if (avresample_available(resample_context)) { - fprintf(stderr, "Converted samples left over\n"); - return AVERROR_EXIT; - } - return 0; } @@ -447,7 +440,7 @@ static int read_decode_convert_and_store(AVAudioFifo *fifo, AVFormatContext *input_format_context, AVCodecContext *input_codec_context, AVCodecContext *output_codec_context, - AVAudioResampleContext *resampler_context, + SwrContext *resampler_context, int *finished) { /** Temporary storage of the input samples of the frame read from the file. */ @@ -484,7 +477,7 @@ static int read_decode_convert_and_store(AVAudioFifo *fifo, * Convert the input samples to the desired output sample format. * This requires a temporary storage provided by converted_input_samples. */ - if (convert_samples(input_frame->extended_data, converted_input_samples, + if (convert_samples((const uint8_t**)input_frame->extended_data, converted_input_samples, input_frame->nb_samples, resampler_context)) goto cleanup; @@ -646,7 +639,7 @@ int main(int argc, char **argv) { AVFormatContext *input_format_context = NULL, *output_format_context = NULL; AVCodecContext *input_codec_context = NULL, *output_codec_context = NULL; - AVAudioResampleContext *resample_context = NULL; + SwrContext *resample_context = NULL; AVAudioFifo *fifo = NULL; int ret = AVERROR_EXIT; @@ -750,10 +743,7 @@ int main(int argc, char **argv) cleanup: if (fifo) av_audio_fifo_free(fifo); - if (resample_context) { - avresample_close(resample_context); - avresample_free(&resample_context); - } + swr_free(&resample_context); if (output_codec_context) avcodec_close(output_codec_context); if (output_format_context) { |