mirror of https://github.com/sipwise/rtpengine.git
Richard Fuchs
9 years ago
parent
1d5668d793
commit
fb81332e80
@ -0,0 +1,104 @@
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#include "resample.h"
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#include <glib.h>
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#include <libavfilter/avfilter.h>
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#include <libavfilter/buffersrc.h>
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#include <libavfilter/buffersink.h>
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#include <libavutil/channel_layout.h>
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#include <libavutil/mathematics.h>
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#include <inttypes.h>
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#include <libavresample/avresample.h>
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#include <libavutil/opt.h>
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#include <libavutil/frame.h>
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#include "log.h"
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#include "types.h"
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AVFrame *resample_frame(resample_t *resample, AVFrame *frame, const format_t *to_format) {
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const char *err;
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uint64_t to_channel_layout = av_get_default_channel_layout(to_format->channels);
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if (frame->format != to_format->format)
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goto resample;
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if (frame->sample_rate != to_format->clockrate)
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goto resample;
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if (frame->channel_layout != to_channel_layout)
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goto resample;
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return frame;
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resample:
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if (G_UNLIKELY(!resample->avresample)) {
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resample->avresample = avresample_alloc_context();
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err = "failed to alloc resample context";
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if (!resample->avresample)
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goto err;
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av_opt_set_int(resample->avresample, "in_channel_layout",
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frame->channel_layout, 0);
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av_opt_set_int(resample->avresample, "in_sample_fmt",
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frame->format, 0);
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av_opt_set_int(resample->avresample, "in_sample_rate",
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frame->sample_rate, 0);
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av_opt_set_int(resample->avresample, "out_channel_layout",
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to_channel_layout, 0);
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av_opt_set_int(resample->avresample, "out_sample_fmt",
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to_format->format, 0);
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av_opt_set_int(resample->avresample, "out_sample_rate",
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to_format->clockrate, 0);
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// av_opt_set_int(dec->avresample, "internal_sample_fmt", AV_SAMPLE_FMT_FLTP, 0); // ?
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err = "failed to init resample context";
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if (avresample_open(resample->avresample) < 0)
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goto err;
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}
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// get a large enough buffer for resampled audio - this should be enough so we don't
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// have to loop
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int dst_samples = avresample_available(resample->avresample) +
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av_rescale_rnd(avresample_get_delay(resample->avresample) + frame->nb_samples,
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to_format->clockrate, frame->sample_rate, AV_ROUND_UP);
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if (G_UNLIKELY(!resample->swr_frame || resample->swr_buffers < dst_samples)) {
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av_frame_free(&resample->swr_frame);
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dbg("allocating resampling frame for %i/%i/%i", to_format->format, (int) to_channel_layout,
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to_format->clockrate);
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resample->swr_frame = av_frame_alloc();
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err = "failed to alloc resampling frame";
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if (!resample->swr_frame)
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goto err;
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av_frame_copy_props(resample->swr_frame, frame);
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resample->swr_frame->format = to_format->format;
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resample->swr_frame->channel_layout = to_channel_layout;
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resample->swr_frame->nb_samples = dst_samples;
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resample->swr_frame->sample_rate = to_format->clockrate;
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err = "failed to get resample buffers";
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if (av_frame_get_buffer(resample->swr_frame, 0) < 0)
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goto err;
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resample->swr_buffers = dst_samples;
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}
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resample->swr_frame->nb_samples = dst_samples;
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int ret_samples = avresample_convert(resample->avresample, resample->swr_frame->extended_data,
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resample->swr_frame->linesize[0], dst_samples,
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frame->extended_data,
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frame->linesize[0], frame->nb_samples);
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err = "failed to resample audio";
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if (ret_samples < 0)
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goto err;
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resample->swr_frame->nb_samples = ret_samples;
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resample->swr_frame->pts = av_rescale(frame->pts, to_format->clockrate, frame->sample_rate);
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return resample->swr_frame;
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err:
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ilog(LOG_ERR, "Error resampling: %s", err);
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return NULL;
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}
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void resample_shutdown(resample_t *resample) {
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av_frame_free(&resample->swr_frame);
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avresample_free(&resample->avresample);
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}
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@ -0,0 +1,13 @@
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#ifndef _RESAMPLE_H_
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#define _RESAMPLE_H_
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#include "types.h"
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#include <libavutil/frame.h>
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AVFrame *resample_frame(resample_t *resample, AVFrame *frame, const format_t *to_format);
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void resample_shutdown(resample_t *resample);
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#endif
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