mirror of https://github.com/sipwise/rtpengine.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
105 lines
3.4 KiB
105 lines
3.4 KiB
#include "resample.h"
|
|
#include <glib.h>
|
|
#include <libavfilter/avfilter.h>
|
|
#include <libavfilter/buffersrc.h>
|
|
#include <libavfilter/buffersink.h>
|
|
#include <libavutil/channel_layout.h>
|
|
#include <libavutil/mathematics.h>
|
|
#include <inttypes.h>
|
|
#include <libavresample/avresample.h>
|
|
#include <libavutil/opt.h>
|
|
#include <libavutil/frame.h>
|
|
#include "log.h"
|
|
#include "types.h"
|
|
|
|
|
|
|
|
|
|
AVFrame *resample_frame(resample_t *resample, AVFrame *frame, const format_t *to_format) {
|
|
const char *err;
|
|
|
|
uint64_t to_channel_layout = av_get_default_channel_layout(to_format->channels);
|
|
if (frame->format != to_format->format)
|
|
goto resample;
|
|
if (frame->sample_rate != to_format->clockrate)
|
|
goto resample;
|
|
if (frame->channel_layout != to_channel_layout)
|
|
goto resample;
|
|
|
|
return frame;
|
|
|
|
resample:
|
|
|
|
if (G_UNLIKELY(!resample->avresample)) {
|
|
resample->avresample = avresample_alloc_context();
|
|
err = "failed to alloc resample context";
|
|
if (!resample->avresample)
|
|
goto err;
|
|
|
|
av_opt_set_int(resample->avresample, "in_channel_layout",
|
|
frame->channel_layout, 0);
|
|
av_opt_set_int(resample->avresample, "in_sample_fmt",
|
|
frame->format, 0);
|
|
av_opt_set_int(resample->avresample, "in_sample_rate",
|
|
frame->sample_rate, 0);
|
|
av_opt_set_int(resample->avresample, "out_channel_layout",
|
|
to_channel_layout, 0);
|
|
av_opt_set_int(resample->avresample, "out_sample_fmt",
|
|
to_format->format, 0);
|
|
av_opt_set_int(resample->avresample, "out_sample_rate",
|
|
to_format->clockrate, 0);
|
|
// av_opt_set_int(dec->avresample, "internal_sample_fmt", AV_SAMPLE_FMT_FLTP, 0); // ?
|
|
|
|
err = "failed to init resample context";
|
|
if (avresample_open(resample->avresample) < 0)
|
|
goto err;
|
|
}
|
|
|
|
// get a large enough buffer for resampled audio - this should be enough so we don't
|
|
// have to loop
|
|
int dst_samples = avresample_available(resample->avresample) +
|
|
av_rescale_rnd(avresample_get_delay(resample->avresample) + frame->nb_samples,
|
|
to_format->clockrate, frame->sample_rate, AV_ROUND_UP);
|
|
if (G_UNLIKELY(!resample->swr_frame || resample->swr_buffers < dst_samples)) {
|
|
av_frame_free(&resample->swr_frame);
|
|
dbg("allocating resampling frame for %i/%i/%i", to_format->format, (int) to_channel_layout,
|
|
to_format->clockrate);
|
|
resample->swr_frame = av_frame_alloc();
|
|
err = "failed to alloc resampling frame";
|
|
if (!resample->swr_frame)
|
|
goto err;
|
|
av_frame_copy_props(resample->swr_frame, frame);
|
|
resample->swr_frame->format = to_format->format;
|
|
resample->swr_frame->channel_layout = to_channel_layout;
|
|
resample->swr_frame->nb_samples = dst_samples;
|
|
resample->swr_frame->sample_rate = to_format->clockrate;
|
|
err = "failed to get resample buffers";
|
|
if (av_frame_get_buffer(resample->swr_frame, 0) < 0)
|
|
goto err;
|
|
resample->swr_buffers = dst_samples;
|
|
}
|
|
|
|
resample->swr_frame->nb_samples = dst_samples;
|
|
int ret_samples = avresample_convert(resample->avresample, resample->swr_frame->extended_data,
|
|
resample->swr_frame->linesize[0], dst_samples,
|
|
frame->extended_data,
|
|
frame->linesize[0], frame->nb_samples);
|
|
err = "failed to resample audio";
|
|
if (ret_samples < 0)
|
|
goto err;
|
|
|
|
resample->swr_frame->nb_samples = ret_samples;
|
|
resample->swr_frame->pts = av_rescale(frame->pts, to_format->clockrate, frame->sample_rate);
|
|
return resample->swr_frame;
|
|
|
|
err:
|
|
ilog(LOG_ERR, "Error resampling: %s", err);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
void resample_shutdown(resample_t *resample) {
|
|
av_frame_free(&resample->swr_frame);
|
|
avresample_free(&resample->avresample);
|
|
}
|