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![Michael Niedermayer](/assets/img/avatar_default.png)
Based on commit fb1ddcdc8f
by Luca Barbato <lu_zero@gentoo.org>
Adapted for libswresample by Michael Niedermayer
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
159 lines
4.4 KiB
C
159 lines
4.4 KiB
C
/*
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* Copyright (c) 2014 Luca Barbato <lu_zero@gentoo.org>
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* Copyright (c) 2014 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "swresample_internal.h"
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#include "libavutil/frame.h"
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#include "libavutil/opt.h"
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int swr_config_frame(SwrContext *s, const AVFrame *out, const AVFrame *in)
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{
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swr_close(s);
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if (in) {
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if (av_opt_set_int(s, "icl", in->channel_layout, 0) < 0)
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goto fail;
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if (av_opt_set_int(s, "isf", in->format, 0) < 0)
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goto fail;
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if (av_opt_set_int(s, "isr", in->sample_rate, 0) < 0)
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goto fail;
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}
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if (out) {
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if (av_opt_set_int(s, "ocl", out->channel_layout, 0) < 0)
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goto fail;
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if (av_opt_set_int(s, "osf", out->format, 0) < 0)
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goto fail;
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if (av_opt_set_int(s, "osr", out->sample_rate, 0) < 0)
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goto fail;
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}
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return 0;
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fail:
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av_log(s, AV_LOG_ERROR, "Failed to set option\n");
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return AVERROR(EINVAL);
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}
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static int config_changed(SwrContext *s,
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const AVFrame *out, const AVFrame *in)
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{
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int ret = 0;
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if (in) {
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if (s->in_ch_layout != in->channel_layout ||
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s->in_sample_rate != in->sample_rate ||
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s->in_sample_fmt != in->format) {
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ret |= AVERROR_INPUT_CHANGED;
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}
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}
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if (out) {
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if (s->out_ch_layout != out->channel_layout ||
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s->out_sample_rate != out->sample_rate ||
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s->out_sample_fmt != out->format) {
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ret |= AVERROR_OUTPUT_CHANGED;
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}
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}
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return ret;
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}
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static inline int convert_frame(SwrContext *s,
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AVFrame *out, const AVFrame *in)
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{
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int ret;
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uint8_t **out_data = NULL;
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const uint8_t **in_data = NULL;
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int out_nb_samples = 0, in_nb_samples = 0;
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if (out) {
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out_data = out->extended_data;
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out_nb_samples = out->nb_samples;
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}
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if (in) {
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in_data = (const uint8_t **)in->extended_data;
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in_nb_samples = in->nb_samples;
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}
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ret = swr_convert(s, out_data, out_nb_samples, in_data, in_nb_samples);
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if (ret < 0) {
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if (out)
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out->nb_samples = 0;
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return ret;
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}
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if (out)
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out->nb_samples = ret;
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return 0;
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}
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static inline int available_samples(AVFrame *out)
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{
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int bytes_per_sample = av_get_bytes_per_sample(out->format);
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int samples = out->linesize[0] / bytes_per_sample;
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if (av_sample_fmt_is_planar(out->format)) {
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return samples;
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} else {
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int channels = av_get_channel_layout_nb_channels(out->channel_layout);
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return samples / channels;
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}
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}
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int swr_convert_frame(SwrContext *s,
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AVFrame *out, const AVFrame *in)
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{
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int ret, setup = 0;
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if (!swr_is_initialized(s)) {
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if ((ret = swr_config_frame(s, out, in)) < 0)
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return ret;
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if ((ret = swr_init(s)) < 0)
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return ret;
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setup = 1;
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} else {
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// return as is or reconfigure for input changes?
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if ((ret = config_changed(s, out, in)))
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return ret;
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}
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if (out) {
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if (!out->linesize[0]) {
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out->nb_samples = swr_get_delay(s, s->out_sample_rate)
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+ in->nb_samples*(int64_t)s->out_sample_rate / s->in_sample_rate
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+ 3;
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if ((ret = av_frame_get_buffer(out, 0)) < 0) {
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if (setup)
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swr_close(s);
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return ret;
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}
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} else {
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if (!out->nb_samples)
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out->nb_samples = available_samples(out);
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}
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}
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return convert_frame(s, out, in);
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}
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