diff options
Diffstat (limited to 'libavresample/utils.c')
-rw-r--r-- | libavresample/utils.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/libavresample/utils.c b/libavresample/utils.c index f4eb66684e..69c255b450 100644 --- a/libavresample/utils.c +++ b/libavresample/utils.c @@ -21,6 +21,7 @@ #include "libavutil/common.h" #include "libavutil/dict.h" // #include "libavutil/error.h" +#include "libavutil/frame.h" #include "libavutil/log.h" #include "libavutil/mem.h" #include "libavutil/opt.h" @@ -500,6 +501,135 @@ int attribute_align_arg avresample_convert(AVAudioResampleContext *avr, current_buffer); } +int avresample_config(AVAudioResampleContext *avr, AVFrame *out, AVFrame *in) +{ + if (avresample_is_open(avr)) { + avresample_close(avr); + } + + if (in) { + avr->in_channel_layout = in->channel_layout; + avr->in_sample_rate = in->sample_rate; + avr->in_sample_fmt = in->format; + } + + if (out) { + avr->out_channel_layout = out->channel_layout; + avr->out_sample_rate = out->sample_rate; + avr->out_sample_fmt = out->format; + } + + return 0; +} + +static int config_changed(AVAudioResampleContext *avr, + AVFrame *out, AVFrame *in) +{ + int ret = 0; + + if (in) { + if (avr->in_channel_layout != in->channel_layout || + avr->in_sample_rate != in->sample_rate || + avr->in_sample_fmt != in->format) { + ret |= AVERROR_INPUT_CHANGED; + } + } + + if (out) { + if (avr->out_channel_layout != out->channel_layout || + avr->out_sample_rate != out->sample_rate || + avr->out_sample_fmt != out->format) { + ret |= AVERROR_OUTPUT_CHANGED; + } + } + + return ret; +} + +static inline int convert_frame(AVAudioResampleContext *avr, + AVFrame *out, AVFrame *in) +{ + int ret; + uint8_t **out_data = NULL, **in_data = NULL; + int out_linesize = 0, in_linesize = 0; + int out_nb_samples = 0, in_nb_samples = 0; + + if (out) { + out_data = out->extended_data; + out_linesize = out->linesize[0]; + out_nb_samples = out->nb_samples; + } + + if (in) { + in_data = in->extended_data; + in_linesize = in->linesize[0]; + in_nb_samples = in->nb_samples; + } + + ret = avresample_convert(avr, out_data, out_linesize, + out_nb_samples, + in_data, in_linesize, + in_nb_samples); + + if (ret < 0) { + if (out) + out->nb_samples = 0; + return ret; + } + + if (out) + out->nb_samples = ret; + + return 0; +} + +static inline int available_samples(AVFrame *out) +{ + int bytes_per_sample = av_get_bytes_per_sample(out->format); + int samples = out->linesize[0] / bytes_per_sample; + + if (av_sample_fmt_is_planar(out->format)) { + return samples; + } else { + int channels = av_get_channel_layout_nb_channels(out->channel_layout); + return samples / channels; + } +} + +int avresample_convert_frame(AVAudioResampleContext *avr, + AVFrame *out, AVFrame *in) +{ + int ret, setup = 0; + + if (!avresample_is_open(avr)) { + if ((ret = avresample_config(avr, out, in)) < 0) + return ret; + if ((ret = avresample_open(avr)) < 0) + return ret; + setup = 1; + } else { + // return as is or reconfigure for input changes? + if ((ret = config_changed(avr, out, in))) + return ret; + } + + if (out) { + if (!out->linesize[0]) { + out->nb_samples = avresample_get_out_samples(avr, in->nb_samples); + if ((ret = av_frame_get_buffer(out, 0)) < 0) { + if (setup) + avresample_close(avr); + return ret; + } + } else { + if (!out->nb_samples) + out->nb_samples = available_samples(out); + } + } + + return convert_frame(avr, out, in); +} + int avresample_get_matrix(AVAudioResampleContext *avr, double *matrix, int stride) { |