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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 | ||
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 |