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/* audio_resample.c
*
* Copyright (c) 2003-2012 HandBrake Team
* This file is part of the HandBrake source code
* Homepage: <http://handbrake.fr/>
* It may be used under the terms of the GNU General Public License v2.
* For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html
*/
#include "common.h"
#include "hbffmpeg.h"
#include "audio_resample.h"
hb_audio_resample_t* hb_audio_resample_init(enum AVSampleFormat sample_fmt,
int hb_amixdown, int do_remix,
int normalize_mix_level)
{
hb_audio_resample_t *resample = malloc(sizeof(hb_audio_resample_t));
if (resample == NULL)
{
hb_error("hb_audio_resample_init: failed to allocate resample");
return NULL;
}
// convert mixdown to channel_layout/matrix_encoding combo
int channels, matrix_encoding;
uint64_t channel_layout = hb_ff_mixdown_xlat(hb_amixdown, &matrix_encoding);
channels = av_get_channel_layout_nb_channels(channel_layout);
// requested channel_layout
resample->out.channels = channels;
resample->out.channel_layout = channel_layout;
resample->out.matrix_encoding = matrix_encoding;
resample->out.normalize_mix_level = normalize_mix_level;
// requested sample_fmt
resample->out.sample_fmt = sample_fmt;
resample->out.sample_size = av_get_bytes_per_sample(sample_fmt);
// set default input characteristics
resample->in.sample_fmt = resample->out.sample_fmt;
resample->in.channel_layout = resample->out.channel_layout;
resample->in.center_mix_level = HB_MIXLEV_DEFAULT;
resample->in.surround_mix_level = HB_MIXLEV_DEFAULT;
// by default, no conversion needed
resample->resample_needed = 0;
resample->avresample = NULL;
resample->do_remix = !!do_remix;
return resample;
}
void hb_audio_resample_set_channel_layout(hb_audio_resample_t *resample,
uint64_t channel_layout,
int channels)
{
if (resample != NULL && resample->do_remix)
{
channel_layout = hb_ff_layout_xlat(channel_layout, channels);
if (channel_layout == AV_CH_LAYOUT_STEREO_DOWNMIX)
{
// Dolby Surround is Stereo when it comes to remixing
channel_layout = AV_CH_LAYOUT_STEREO;
}
resample->in.channel_layout = channel_layout;
}
}
void hb_audio_resample_set_mix_levels(hb_audio_resample_t *resample,
double surround_mix_level,
double center_mix_level)
{
if (resample != NULL && resample->do_remix)
{
resample->in.center_mix_level = center_mix_level;
resample->in.surround_mix_level = surround_mix_level;
}
}
void hb_audio_resample_set_sample_fmt(hb_audio_resample_t *resample,
enum AVSampleFormat sample_fmt)
{
if (resample != NULL)
{
resample->in.sample_fmt = sample_fmt;
}
}
int hb_audio_resample_update(hb_audio_resample_t *resample)
{
if (resample == NULL)
{
hb_error("hb_audio_resample_update: resample is NULL");
return 1;
}
int ret, resample_changed;
resample->resample_needed =
(resample->resample_needed ||
resample->out.sample_fmt != resample->in.sample_fmt ||
resample->out.channel_layout != resample->in.channel_layout);
resample_changed =
(resample->resample_needed &&
(resample->resample.sample_fmt != resample->in.sample_fmt ||
resample->resample.channel_layout != resample->in.channel_layout ||
resample->resample.center_mix_level != resample->in.center_mix_level ||
resample->resample.surround_mix_level != resample->in.surround_mix_level));
if (resample_changed || (resample->resample_needed &&
resample->avresample == NULL))
{
if (resample->avresample == NULL)
{
resample->avresample = avresample_alloc_context();
if (resample->avresample == NULL)
{
hb_error("hb_audio_resample_update: avresample_alloc_context() failed");
return 1;
}
av_opt_set_int(resample->avresample, "out_sample_fmt",
resample->out.sample_fmt, 0);
av_opt_set_int(resample->avresample, "out_channel_layout",
resample->out.channel_layout, 0);
av_opt_set_int(resample->avresample, "matrix_encoding",
resample->out.matrix_encoding, 0);
av_opt_set_int(resample->avresample, "normalize_mix_level",
resample->out.normalize_mix_level, 0);
}
else if (resample_changed)
{
avresample_close(resample->avresample);
}
av_opt_set_int(resample->avresample, "in_sample_fmt",
resample->in.sample_fmt, 0);
av_opt_set_int(resample->avresample, "in_channel_layout",
resample->in.channel_layout, 0);
av_opt_set_double(resample->avresample, "center_mix_level",
resample->in.center_mix_level, 0);
av_opt_set_double(resample->avresample, "surround_mix_level",
resample->in.surround_mix_level, 0);
if ((ret = avresample_open(resample->avresample)))
{
char err_desc[64];
av_strerror(ret, err_desc, 63);
hb_error("hb_audio_resample_update: avresample_open() failed (%s)",
err_desc);
// avresample won't open, start over
avresample_free(&resample->avresample);
return ret;
}
resample->resample.sample_fmt = resample->in.sample_fmt;
resample->resample.channel_layout = resample->in.channel_layout;
resample->resample.channels =
av_get_channel_layout_nb_channels(resample->in.channel_layout);
resample->resample.center_mix_level = resample->in.center_mix_level;
resample->resample.surround_mix_level = resample->in.surround_mix_level;
}
return 0;
}
void hb_audio_resample_free(hb_audio_resample_t *resample)
{
if (resample != NULL)
{
if (resample->avresample != NULL)
{
avresample_free(&resample->avresample);
}
free(resample);
}
}
hb_buffer_t* hb_audio_resample(hb_audio_resample_t *resample,
void *samples, int nsamples)
{
if (resample == NULL)
{
hb_error("hb_audio_resample: resample is NULL");
return NULL;
}
if (resample->resample_needed && resample->avresample == NULL)
{
hb_error("hb_audio_resample: resample needed but libavresample context "
"is NULL");
return NULL;
}
int out_size;
hb_buffer_t *out;
if (resample->resample_needed)
{
int in_linesize, out_linesize, out_samples;
// set in/out linesize and out_size
av_samples_get_buffer_size(&in_linesize,
resample->resample.channels, nsamples,
resample->resample.sample_fmt, 0);
out_size = av_samples_get_buffer_size(&out_linesize,
resample->out.channels, nsamples,
resample->out.sample_fmt, 0);
out = hb_buffer_init(out_size);
out_samples = avresample_convert(resample->avresample,
(void**)&out->data, out_linesize, nsamples,
(void**)&samples, in_linesize, nsamples);
if (out_samples <= 0)
{
if (out_samples < 0)
hb_log("hb_audio_resample: avresample_convert() failed");
// don't send empty buffers downstream (EOF)
hb_buffer_close(&out);
return NULL;
}
out->size = (out_samples *
resample->out.sample_size * resample->out.channels);
}
else
{
out_size = (nsamples *
resample->out.sample_size * resample->out.channels);
out = hb_buffer_init(out_size);
memcpy(out->data, samples, out_size);
}
return out;
}
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