blob: 1bf75ced54bf17bb07b3fcd97aa18e6b27626deb
| 1 | /* |
| 2 | * Audio FIFO |
| 3 | * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com> |
| 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 | /** |
| 23 | * @file |
| 24 | * Audio FIFO |
| 25 | */ |
| 26 | |
| 27 | #include "avutil.h" |
| 28 | #include "audio_fifo.h" |
| 29 | #include "common.h" |
| 30 | #include "fifo.h" |
| 31 | #include "mem.h" |
| 32 | #include "samplefmt.h" |
| 33 | |
| 34 | struct AVAudioFifo { |
| 35 | AVFifoBuffer **buf; /**< single buffer for interleaved, per-channel buffers for planar */ |
| 36 | int nb_buffers; /**< number of buffers */ |
| 37 | int nb_samples; /**< number of samples currently in the FIFO */ |
| 38 | int allocated_samples; /**< current allocated size, in samples */ |
| 39 | |
| 40 | int channels; /**< number of channels */ |
| 41 | enum AVSampleFormat sample_fmt; /**< sample format */ |
| 42 | int sample_size; /**< size, in bytes, of one sample in a buffer */ |
| 43 | }; |
| 44 | |
| 45 | void av_audio_fifo_free(AVAudioFifo *af) |
| 46 | { |
| 47 | if (af) { |
| 48 | if (af->buf) { |
| 49 | int i; |
| 50 | for (i = 0; i < af->nb_buffers; i++) { |
| 51 | av_fifo_freep(&af->buf[i]); |
| 52 | } |
| 53 | av_freep(&af->buf); |
| 54 | } |
| 55 | av_free(af); |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | AVAudioFifo *av_audio_fifo_alloc(enum AVSampleFormat sample_fmt, int channels, |
| 60 | int nb_samples) |
| 61 | { |
| 62 | AVAudioFifo *af; |
| 63 | int buf_size, i; |
| 64 | |
| 65 | /* get channel buffer size (also validates parameters) */ |
| 66 | if (av_samples_get_buffer_size(&buf_size, channels, nb_samples, sample_fmt, 1) < 0) |
| 67 | return NULL; |
| 68 | |
| 69 | af = av_mallocz(sizeof(*af)); |
| 70 | if (!af) |
| 71 | return NULL; |
| 72 | |
| 73 | af->channels = channels; |
| 74 | af->sample_fmt = sample_fmt; |
| 75 | af->sample_size = buf_size / nb_samples; |
| 76 | af->nb_buffers = av_sample_fmt_is_planar(sample_fmt) ? channels : 1; |
| 77 | |
| 78 | af->buf = av_mallocz_array(af->nb_buffers, sizeof(*af->buf)); |
| 79 | if (!af->buf) |
| 80 | goto error; |
| 81 | |
| 82 | for (i = 0; i < af->nb_buffers; i++) { |
| 83 | af->buf[i] = av_fifo_alloc(buf_size); |
| 84 | if (!af->buf[i]) |
| 85 | goto error; |
| 86 | } |
| 87 | af->allocated_samples = nb_samples; |
| 88 | |
| 89 | return af; |
| 90 | |
| 91 | error: |
| 92 | av_audio_fifo_free(af); |
| 93 | return NULL; |
| 94 | } |
| 95 | |
| 96 | int av_audio_fifo_realloc(AVAudioFifo *af, int nb_samples) |
| 97 | { |
| 98 | int i, ret, buf_size; |
| 99 | |
| 100 | if ((ret = av_samples_get_buffer_size(&buf_size, af->channels, nb_samples, |
| 101 | af->sample_fmt, 1)) < 0) |
| 102 | return ret; |
| 103 | |
| 104 | for (i = 0; i < af->nb_buffers; i++) { |
| 105 | if ((ret = av_fifo_realloc2(af->buf[i], buf_size)) < 0) |
| 106 | return ret; |
| 107 | } |
| 108 | af->allocated_samples = nb_samples; |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | int av_audio_fifo_write(AVAudioFifo *af, void **data, int nb_samples) |
| 113 | { |
| 114 | int i, ret, size; |
| 115 | |
| 116 | /* automatically reallocate buffers if needed */ |
| 117 | if (av_audio_fifo_space(af) < nb_samples) { |
| 118 | int current_size = av_audio_fifo_size(af); |
| 119 | /* check for integer overflow in new size calculation */ |
| 120 | if (INT_MAX / 2 - current_size < nb_samples) |
| 121 | return AVERROR(EINVAL); |
| 122 | /* reallocate buffers */ |
| 123 | if ((ret = av_audio_fifo_realloc(af, 2 * (current_size + nb_samples))) < 0) |
| 124 | return ret; |
| 125 | } |
| 126 | |
| 127 | size = nb_samples * af->sample_size; |
| 128 | for (i = 0; i < af->nb_buffers; i++) { |
| 129 | ret = av_fifo_generic_write(af->buf[i], data[i], size, NULL); |
| 130 | if (ret != size) |
| 131 | return AVERROR_BUG; |
| 132 | } |
| 133 | af->nb_samples += nb_samples; |
| 134 | |
| 135 | return nb_samples; |
| 136 | } |
| 137 | |
| 138 | int av_audio_fifo_peek(AVAudioFifo *af, void **data, int nb_samples) |
| 139 | { |
| 140 | int i, ret, size; |
| 141 | |
| 142 | if (nb_samples < 0) |
| 143 | return AVERROR(EINVAL); |
| 144 | nb_samples = FFMIN(nb_samples, af->nb_samples); |
| 145 | if (!nb_samples) |
| 146 | return 0; |
| 147 | |
| 148 | size = nb_samples * af->sample_size; |
| 149 | for (i = 0; i < af->nb_buffers; i++) { |
| 150 | if ((ret = av_fifo_generic_peek(af->buf[i], data[i], size, NULL)) < 0) |
| 151 | return AVERROR_BUG; |
| 152 | } |
| 153 | |
| 154 | return nb_samples; |
| 155 | } |
| 156 | |
| 157 | int av_audio_fifo_peek_at(AVAudioFifo *af, void **data, int nb_samples, int offset) |
| 158 | { |
| 159 | int i, ret, size; |
| 160 | |
| 161 | if (offset < 0 || offset >= af->nb_samples) |
| 162 | return AVERROR(EINVAL); |
| 163 | if (nb_samples < 0) |
| 164 | return AVERROR(EINVAL); |
| 165 | nb_samples = FFMIN(nb_samples, af->nb_samples); |
| 166 | if (!nb_samples) |
| 167 | return 0; |
| 168 | if (offset > af->nb_samples - nb_samples) |
| 169 | return AVERROR(EINVAL); |
| 170 | |
| 171 | offset *= af->sample_size; |
| 172 | size = nb_samples * af->sample_size; |
| 173 | for (i = 0; i < af->nb_buffers; i++) { |
| 174 | if ((ret = av_fifo_generic_peek_at(af->buf[i], data[i], offset, size, NULL)) < 0) |
| 175 | return AVERROR_BUG; |
| 176 | } |
| 177 | |
| 178 | return nb_samples; |
| 179 | } |
| 180 | |
| 181 | int av_audio_fifo_read(AVAudioFifo *af, void **data, int nb_samples) |
| 182 | { |
| 183 | int i, size; |
| 184 | |
| 185 | if (nb_samples < 0) |
| 186 | return AVERROR(EINVAL); |
| 187 | nb_samples = FFMIN(nb_samples, af->nb_samples); |
| 188 | if (!nb_samples) |
| 189 | return 0; |
| 190 | |
| 191 | size = nb_samples * af->sample_size; |
| 192 | for (i = 0; i < af->nb_buffers; i++) { |
| 193 | if (av_fifo_generic_read(af->buf[i], data[i], size, NULL) < 0) |
| 194 | return AVERROR_BUG; |
| 195 | } |
| 196 | af->nb_samples -= nb_samples; |
| 197 | |
| 198 | return nb_samples; |
| 199 | } |
| 200 | |
| 201 | int av_audio_fifo_drain(AVAudioFifo *af, int nb_samples) |
| 202 | { |
| 203 | int i, size; |
| 204 | |
| 205 | if (nb_samples < 0) |
| 206 | return AVERROR(EINVAL); |
| 207 | nb_samples = FFMIN(nb_samples, af->nb_samples); |
| 208 | |
| 209 | if (nb_samples) { |
| 210 | size = nb_samples * af->sample_size; |
| 211 | for (i = 0; i < af->nb_buffers; i++) |
| 212 | av_fifo_drain(af->buf[i], size); |
| 213 | af->nb_samples -= nb_samples; |
| 214 | } |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | void av_audio_fifo_reset(AVAudioFifo *af) |
| 219 | { |
| 220 | int i; |
| 221 | |
| 222 | for (i = 0; i < af->nb_buffers; i++) |
| 223 | av_fifo_reset(af->buf[i]); |
| 224 | |
| 225 | af->nb_samples = 0; |
| 226 | } |
| 227 | |
| 228 | int av_audio_fifo_size(AVAudioFifo *af) |
| 229 | { |
| 230 | return af->nb_samples; |
| 231 | } |
| 232 | |
| 233 | int av_audio_fifo_space(AVAudioFifo *af) |
| 234 | { |
| 235 | return af->allocated_samples - af->nb_samples; |
| 236 | } |
| 237 |