| 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 | |