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swresample_frame.c
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1 /*
2  * Copyright (c) 2014 Luca Barbato <lu_zero@gentoo.org>
3  * Copyright (c) 2014 Michael Niedermayer <michaelni@gmx.at>
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 #include "swresample_internal.h"
23 #include "libavutil/frame.h"
24 #include "libavutil/opt.h"
25 
27 {
28  swr_close(s);
29 
30  if (in) {
31  if (av_opt_set_int(s, "icl", in->channel_layout, 0) < 0)
32  goto fail;
33  if (av_opt_set_int(s, "isf", in->format, 0) < 0)
34  goto fail;
35  if (av_opt_set_int(s, "isr", in->sample_rate, 0) < 0)
36  goto fail;
37  }
38 
39  if (out) {
40  if (av_opt_set_int(s, "ocl", out->channel_layout, 0) < 0)
41  goto fail;
42  if (av_opt_set_int(s, "osf", out->format, 0) < 0)
43  goto fail;
44  if (av_opt_set_int(s, "osr", out->sample_rate, 0) < 0)
45  goto fail;
46  }
47 
48  return 0;
49 fail:
50  av_log(s, AV_LOG_ERROR, "Failed to set option\n");
51  return AVERROR(EINVAL);
52 }
53 
55  const AVFrame *out, const AVFrame *in)
56 {
57  int ret = 0;
58 
59  if (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;
64  }
65  }
66 
67  if (out) {
68  if (s->out_ch_layout != out->channel_layout ||
69  s->out_sample_rate != out->sample_rate ||
70  s->out_sample_fmt != out->format) {
72  }
73  }
74 
75  return ret;
76 }
77 
78 static inline int convert_frame(SwrContext *s,
79  AVFrame *out, const AVFrame *in)
80 {
81  int ret;
82  uint8_t **out_data = NULL;
83  const uint8_t **in_data = NULL;
84  int out_nb_samples = 0, in_nb_samples = 0;
85 
86  if (out) {
87  out_data = out->extended_data;
88  out_nb_samples = out->nb_samples;
89  }
90 
91  if (in) {
92  in_data = (const uint8_t **)in->extended_data;
93  in_nb_samples = in->nb_samples;
94  }
95 
96  ret = swr_convert(s, out_data, out_nb_samples, in_data, in_nb_samples);
97 
98  if (ret < 0) {
99  if (out)
100  out->nb_samples = 0;
101  return ret;
102  }
103 
104  if (out)
105  out->nb_samples = ret;
106 
107  return 0;
108 }
109 
110 static inline int available_samples(AVFrame *out)
111 {
112  int bytes_per_sample = av_get_bytes_per_sample(out->format);
113  int samples = out->linesize[0] / bytes_per_sample;
114 
115  if (av_sample_fmt_is_planar(out->format)) {
116  return samples;
117  } else {
119  return samples / channels;
120  }
121 }
122 
124  AVFrame *out, const AVFrame *in)
125 {
126  int ret, setup = 0;
127 
128  if (!swr_is_initialized(s)) {
129  if ((ret = swr_config_frame(s, out, in)) < 0)
130  return ret;
131  if ((ret = swr_init(s)) < 0)
132  return ret;
133  setup = 1;
134  } else {
135  // return as is or reconfigure for input changes?
136  if ((ret = config_changed(s, out, in)))
137  return ret;
138  }
139 
140  if (out) {
141  if (!out->linesize[0]) {
143  + in->nb_samples*(int64_t)s->out_sample_rate / s->in_sample_rate
144  + 3;
145  if ((ret = av_frame_get_buffer(out, 0)) < 0) {
146  if (setup)
147  swr_close(s);
148  return ret;
149  }
150  } else {
151  if (!out->nb_samples)
152  out->nb_samples = available_samples(out);
153  }
154  }
155 
156  return convert_frame(s, out, in);
157 }
158