blob: 71d3ed711acb14a7448904dc46eeff1be531d216
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 | |
26 | int swr_config_frame(SwrContext *s, const AVFrame *out, const AVFrame *in) |
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 | |
54 | static int config_changed(SwrContext *s, |
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) { |
71 | ret |= AVERROR_OUTPUT_CHANGED; |
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 { |
118 | int channels = av_get_channel_layout_nb_channels(out->channel_layout); |
119 | return samples / channels; |
120 | } |
121 | } |
122 | |
123 | int swr_convert_frame(SwrContext *s, |
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]) { |
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 |
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 | |
159 |