2 * Copyright (c) 2014 Luca Barbato <lu_zero@gentoo.org>
3 * Copyright (c) 2014 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "swresample_internal.h"
23 #include "libavutil/frame.h"
24 #include "libavutil/opt.h"
26 int swr_config_frame(SwrContext *s, const AVFrame *out, const AVFrame *in)
31 if (av_opt_set_int(s, "icl", in->channel_layout, 0) < 0)
33 if (av_opt_set_int(s, "isf", in->format, 0) < 0)
35 if (av_opt_set_int(s, "isr", in->sample_rate, 0) < 0)
40 if (av_opt_set_int(s, "ocl", out->channel_layout, 0) < 0)
42 if (av_opt_set_int(s, "osf", out->format, 0) < 0)
44 if (av_opt_set_int(s, "osr", out->sample_rate, 0) < 0)
50 av_log(s, AV_LOG_ERROR, "Failed to set option\n");
51 return AVERROR(EINVAL);
54 static int config_changed(SwrContext *s,
55 const AVFrame *out, const AVFrame *in)
60 if (s->in_ch_layout != in->channel_layout ||
61 s->in_sample_rate != in->sample_rate ||
62 s->in_sample_fmt != in->format) {
63 ret |= AVERROR_INPUT_CHANGED;
68 if (s->out_ch_layout != out->channel_layout ||
69 s->out_sample_rate != out->sample_rate ||
70 s->out_sample_fmt != out->format) {
71 ret |= AVERROR_OUTPUT_CHANGED;
78 static inline int convert_frame(SwrContext *s,
79 AVFrame *out, const AVFrame *in)
82 uint8_t **out_data = NULL;
83 const uint8_t **in_data = NULL;
84 int out_nb_samples = 0, in_nb_samples = 0;
87 out_data = out->extended_data;
88 out_nb_samples = out->nb_samples;
92 in_data = (const uint8_t **)in->extended_data;
93 in_nb_samples = in->nb_samples;
96 ret = swr_convert(s, out_data, out_nb_samples, in_data, in_nb_samples);
105 out->nb_samples = ret;
110 static inline int available_samples(AVFrame *out)
112 int bytes_per_sample = av_get_bytes_per_sample(out->format);
113 int samples = out->linesize[0] / bytes_per_sample;
115 if (av_sample_fmt_is_planar(out->format)) {
118 int channels = av_get_channel_layout_nb_channels(out->channel_layout);
119 return samples / channels;
123 int swr_convert_frame(SwrContext *s,
124 AVFrame *out, const AVFrame *in)
128 if (!swr_is_initialized(s)) {
129 if ((ret = swr_config_frame(s, out, in)) < 0)
131 if ((ret = swr_init(s)) < 0)
135 // return as is or reconfigure for input changes?
136 if ((ret = config_changed(s, out, in)))
141 if (!out->linesize[0]) {
142 out->nb_samples = swr_get_delay(s, s->out_sample_rate)
143 + in->nb_samples*(int64_t)s->out_sample_rate / s->in_sample_rate
145 if ((ret = av_frame_get_buffer(out, 0)) < 0) {
151 if (!out->nb_samples)
152 out->nb_samples = available_samples(out);
156 return convert_frame(s, out, in);