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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | * Audio FIFO |
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3 | * Copyright (c) 2012 Justin Ruggles |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | /** |
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23 | * @file |
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24 | * Audio FIFO |
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25 | */ |
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26 | |||
27 | #include "avutil.h" |
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28 | #include "audio_fifo.h" |
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29 | #include "common.h" |
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30 | #include "fifo.h" |
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31 | #include "mem.h" |
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32 | #include "samplefmt.h" |
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33 | |||
34 | struct AVAudioFifo { |
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35 | AVFifoBuffer **buf; /**< single buffer for interleaved, per-channel buffers for planar */ |
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36 | int nb_buffers; /**< number of buffers */ |
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37 | int nb_samples; /**< number of samples currently in the FIFO */ |
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38 | int allocated_samples; /**< current allocated size, in samples */ |
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39 | |||
40 | int channels; /**< number of channels */ |
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41 | enum AVSampleFormat sample_fmt; /**< sample format */ |
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42 | int sample_size; /**< size, in bytes, of one sample in a buffer */ |
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43 | }; |
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44 | |||
45 | void av_audio_fifo_free(AVAudioFifo *af) |
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46 | { |
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47 | if (af) { |
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48 | if (af->buf) { |
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49 | int i; |
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50 | for (i = 0; i < af->nb_buffers; i++) { |
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51 | if (af->buf[i]) |
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52 | av_fifo_free(af->buf[i]); |
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53 | } |
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54 | av_free(af->buf); |
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55 | } |
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56 | av_free(af); |
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57 | } |
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58 | } |
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59 | |||
60 | AVAudioFifo *av_audio_fifo_alloc(enum AVSampleFormat sample_fmt, int channels, |
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61 | int nb_samples) |
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62 | { |
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63 | AVAudioFifo *af; |
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64 | int buf_size, i; |
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65 | |||
66 | /* get channel buffer size (also validates parameters) */ |
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67 | if (av_samples_get_buffer_size(&buf_size, channels, nb_samples, sample_fmt, 1) < 0) |
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68 | return NULL; |
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69 | |||
70 | af = av_mallocz(sizeof(*af)); |
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71 | if (!af) |
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72 | return NULL; |
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73 | |||
74 | af->channels = channels; |
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75 | af->sample_fmt = sample_fmt; |
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76 | af->sample_size = buf_size / nb_samples; |
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77 | af->nb_buffers = av_sample_fmt_is_planar(sample_fmt) ? channels : 1; |
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78 | |||
79 | af->buf = av_mallocz(af->nb_buffers * sizeof(*af->buf)); |
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80 | if (!af->buf) |
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81 | goto error; |
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82 | |||
83 | for (i = 0; i < af->nb_buffers; i++) { |
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84 | af->buf[i] = av_fifo_alloc(buf_size); |
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85 | if (!af->buf[i]) |
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86 | goto error; |
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87 | } |
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88 | af->allocated_samples = nb_samples; |
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89 | |||
90 | return af; |
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91 | |||
92 | error: |
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93 | av_audio_fifo_free(af); |
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94 | return NULL; |
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95 | } |
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96 | |||
97 | int av_audio_fifo_realloc(AVAudioFifo *af, int nb_samples) |
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98 | { |
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99 | int i, ret, buf_size; |
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100 | |||
101 | if ((ret = av_samples_get_buffer_size(&buf_size, af->channels, nb_samples, |
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102 | af->sample_fmt, 1)) < 0) |
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103 | return ret; |
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104 | |||
105 | for (i = 0; i < af->nb_buffers; i++) { |
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106 | if ((ret = av_fifo_realloc2(af->buf[i], buf_size)) < 0) |
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107 | return ret; |
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108 | } |
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109 | af->allocated_samples = nb_samples; |
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110 | return 0; |
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111 | } |
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112 | |||
113 | int av_audio_fifo_write(AVAudioFifo *af, void **data, int nb_samples) |
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114 | { |
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115 | int i, ret, size; |
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116 | |||
117 | /* automatically reallocate buffers if needed */ |
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118 | if (av_audio_fifo_space(af) < nb_samples) { |
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119 | int current_size = av_audio_fifo_size(af); |
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120 | /* check for integer overflow in new size calculation */ |
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121 | if (INT_MAX / 2 - current_size < nb_samples) |
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122 | return AVERROR(EINVAL); |
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123 | /* reallocate buffers */ |
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124 | if ((ret = av_audio_fifo_realloc(af, 2 * (current_size + nb_samples))) < 0) |
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125 | return ret; |
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126 | } |
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127 | |||
128 | size = nb_samples * af->sample_size; |
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129 | for (i = 0; i < af->nb_buffers; i++) { |
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130 | ret = av_fifo_generic_write(af->buf[i], data[i], size, NULL); |
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131 | if (ret != size) |
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132 | return AVERROR_BUG; |
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133 | } |
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134 | af->nb_samples += nb_samples; |
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135 | |||
136 | return nb_samples; |
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137 | } |
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138 | |||
139 | int av_audio_fifo_read(AVAudioFifo *af, void **data, int nb_samples) |
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140 | { |
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141 | int i, ret, size; |
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142 | |||
143 | if (nb_samples < 0) |
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144 | return AVERROR(EINVAL); |
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145 | nb_samples = FFMIN(nb_samples, af->nb_samples); |
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146 | if (!nb_samples) |
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147 | return 0; |
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148 | |||
149 | size = nb_samples * af->sample_size; |
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150 | for (i = 0; i < af->nb_buffers; i++) { |
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151 | if ((ret = av_fifo_generic_read(af->buf[i], data[i], size, NULL)) < 0) |
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152 | return AVERROR_BUG; |
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153 | } |
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154 | af->nb_samples -= nb_samples; |
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155 | |||
156 | return nb_samples; |
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157 | } |
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158 | |||
159 | int av_audio_fifo_drain(AVAudioFifo *af, int nb_samples) |
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160 | { |
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161 | int i, size; |
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162 | |||
163 | if (nb_samples < 0) |
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164 | return AVERROR(EINVAL); |
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165 | nb_samples = FFMIN(nb_samples, af->nb_samples); |
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166 | |||
167 | if (nb_samples) { |
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168 | size = nb_samples * af->sample_size; |
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169 | for (i = 0; i < af->nb_buffers; i++) |
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170 | av_fifo_drain(af->buf[i], size); |
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171 | af->nb_samples -= nb_samples; |
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172 | } |
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173 | return 0; |
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174 | } |
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175 | |||
176 | void av_audio_fifo_reset(AVAudioFifo *af) |
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177 | { |
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178 | int i; |
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179 | |||
180 | for (i = 0; i < af->nb_buffers; i++) |
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181 | av_fifo_reset(af->buf[i]); |
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182 | |||
183 | af->nb_samples = 0; |
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184 | } |
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185 | |||
186 | int av_audio_fifo_size(AVAudioFifo *af) |
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187 | { |
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188 | return af->nb_samples; |
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189 | } |
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190 | |||
191 | int av_audio_fifo_space(AVAudioFifo *af) |
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192 | { |
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193 | return af->allocated_samples - af->nb_samples; |
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194 | }>>>>>>>>>>>>>>>>>>>>>>> |