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/*
* Copyright (c) 2014 Luca Barbato <lu_zero@gentoo.org>
* Copyright (c) 2014 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "swresample_internal.h"
#include "libavutil/channel_layout.h"
#include "libavutil/frame.h"
#include "libavutil/opt.h"
int swr_config_frame(SwrContext *s, const AVFrame *out, const AVFrame *in)
{
AVChannelLayout ch_layout = { 0 };
int ret;
swr_close(s);
if (in) {
if ((ret = av_channel_layout_copy(&ch_layout, &in->ch_layout)) < 0)
goto fail;
if ((ret = av_opt_set_chlayout(s, "ichl", &ch_layout, 0)) < 0)
goto fail;
if ((ret = av_opt_set_int(s, "isf", in->format, 0)) < 0)
goto fail;
if ((ret = av_opt_set_int(s, "isr", in->sample_rate, 0)) < 0)
goto fail;
}
if (out) {
if ((ret = av_channel_layout_copy(&ch_layout, &out->ch_layout)) < 0)
goto fail;
if ((ret = av_opt_set_chlayout(s, "ochl", &ch_layout, 0)) < 0)
goto fail;
if ((ret = av_opt_set_int(s, "osf", out->format, 0)) < 0)
goto fail;
if ((ret = av_opt_set_int(s, "osr", out->sample_rate, 0)) < 0)
goto fail;
}
ret = 0;
fail:
if (ret < 0)
av_log(s, AV_LOG_ERROR, "Failed to set option\n");
av_channel_layout_uninit(&ch_layout);
return ret;
}
static int config_changed(SwrContext *s,
const AVFrame *out, const AVFrame *in)
{
AVChannelLayout ch_layout = { 0 };
int ret = 0, err;
if (in) {
if ((err = av_channel_layout_copy(&ch_layout, &in->ch_layout)) < 0)
return err;
if (av_channel_layout_compare(&s->in_ch_layout, &ch_layout) ||
s->in_sample_rate != in->sample_rate ||
s->in_sample_fmt != in->format) {
ret |= AVERROR_INPUT_CHANGED;
}
}
if (out) {
if ((err = av_channel_layout_copy(&ch_layout, &out->ch_layout)) < 0)
return err;
if (av_channel_layout_compare(&s->out_ch_layout, &ch_layout) ||
s->out_sample_rate != out->sample_rate ||
s->out_sample_fmt != out->format) {
ret |= AVERROR_OUTPUT_CHANGED;
}
}
av_channel_layout_uninit(&ch_layout);
return ret;
}
static inline int convert_frame(SwrContext *s,
AVFrame *out, const AVFrame *in)
{
int ret;
uint8_t **out_data = NULL;
const uint8_t **in_data = NULL;
int out_nb_samples = 0, in_nb_samples = 0;
if (out) {
out_data = out->extended_data;
out_nb_samples = out->nb_samples;
}
if (in) {
in_data = (const uint8_t **)in->extended_data;
in_nb_samples = in->nb_samples;
}
ret = swr_convert(s, out_data, out_nb_samples, in_data, 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 = out->ch_layout.nb_channels;
return samples / channels;
}
}
int swr_convert_frame(SwrContext *s,
AVFrame *out, const AVFrame *in)
{
int ret, setup = 0;
if (!swr_is_initialized(s)) {
if ((ret = swr_config_frame(s, out, in)) < 0)
return ret;
if ((ret = swr_init(s)) < 0)
return ret;
setup = 1;
} else {
// return as is or reconfigure for input changes?
if ((ret = config_changed(s, out, in)))
return ret;
}
if (out) {
if (!out->linesize[0]) {
out->nb_samples = swr_get_delay(s, s->out_sample_rate) + 3;
if (in) {
out->nb_samples += in->nb_samples*(int64_t)s->out_sample_rate / s->in_sample_rate;
}
if ((ret = av_frame_get_buffer(out, 0)) < 0) {
if (setup)
swr_close(s);
return ret;
}
} else {
if (!out->nb_samples)
out->nb_samples = available_samples(out);
}
}
return convert_frame(s, out, in);
}
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