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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2012 Justin Ruggles |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef AVRESAMPLE_AUDIO_DATA_H |
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| 22 | #define AVRESAMPLE_AUDIO_DATA_H |
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| 23 | |||
| 24 | #include |
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| 25 | |||
| 26 | #include "libavutil/audio_fifo.h" |
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| 27 | #include "libavutil/log.h" |
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| 28 | #include "libavutil/samplefmt.h" |
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| 29 | #include "avresample.h" |
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| 30 | #include "internal.h" |
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| 31 | |||
| 32 | /** |
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| 33 | * Audio buffer used for intermediate storage between conversion phases. |
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| 34 | */ |
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| 35 | struct AudioData { |
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| 36 | const AVClass *class; /**< AVClass for logging */ |
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| 37 | uint8_t *data[AVRESAMPLE_MAX_CHANNELS]; /**< data plane pointers */ |
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| 38 | uint8_t *buffer; /**< data buffer */ |
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| 39 | unsigned int buffer_size; /**< allocated buffer size */ |
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| 40 | int allocated_samples; /**< number of samples the buffer can hold */ |
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| 41 | int nb_samples; /**< current number of samples */ |
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| 42 | enum AVSampleFormat sample_fmt; /**< sample format */ |
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| 43 | int channels; /**< channel count */ |
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| 44 | int allocated_channels; /**< allocated channel count */ |
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| 45 | int is_planar; /**< sample format is planar */ |
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| 46 | int planes; /**< number of data planes */ |
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| 47 | int sample_size; /**< bytes per sample */ |
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| 48 | int stride; /**< sample byte offset within a plane */ |
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| 49 | int read_only; /**< data is read-only */ |
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| 50 | int allow_realloc; /**< realloc is allowed */ |
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| 51 | int ptr_align; /**< minimum data pointer alignment */ |
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| 52 | int samples_align; /**< allocated samples alignment */ |
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| 53 | const char *name; /**< name for debug logging */ |
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| 54 | }; |
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| 55 | |||
| 56 | int ff_audio_data_set_channels(AudioData *a, int channels); |
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| 57 | |||
| 58 | /** |
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| 59 | * Initialize AudioData using a given source. |
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| 60 | * |
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| 61 | * This does not allocate an internal buffer. It only sets the data pointers |
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| 62 | * and audio parameters. |
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| 63 | * |
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| 64 | * @param a AudioData struct |
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| 65 | * @param src source data pointers |
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| 66 | * @param plane_size plane size, in bytes. |
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| 67 | * This can be 0 if unknown, but that will lead to |
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| 68 | * optimized functions not being used in many cases, |
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| 69 | * which could slow down some conversions. |
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| 70 | * @param channels channel count |
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| 71 | * @param nb_samples number of samples in the source data |
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| 72 | * @param sample_fmt sample format |
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| 73 | * @param read_only indicates if buffer is read only or read/write |
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| 74 | * @param name name for debug logging (can be NULL) |
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| 75 | * @return 0 on success, negative AVERROR value on error |
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| 76 | */ |
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| 77 | int ff_audio_data_init(AudioData *a, uint8_t **src, int plane_size, int channels, |
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| 78 | int nb_samples, enum AVSampleFormat sample_fmt, |
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| 79 | int read_only, const char *name); |
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| 80 | |||
| 81 | /** |
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| 82 | * Allocate AudioData. |
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| 83 | * |
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| 84 | * This allocates an internal buffer and sets audio parameters. |
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| 85 | * |
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| 86 | * @param channels channel count |
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| 87 | * @param nb_samples number of samples to allocate space for |
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| 88 | * @param sample_fmt sample format |
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| 89 | * @param name name for debug logging (can be NULL) |
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| 90 | * @return newly allocated AudioData struct, or NULL on error |
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| 91 | */ |
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| 92 | AudioData *ff_audio_data_alloc(int channels, int nb_samples, |
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| 93 | enum AVSampleFormat sample_fmt, |
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| 94 | const char *name); |
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| 95 | |||
| 96 | /** |
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| 97 | * Reallocate AudioData. |
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| 98 | * |
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| 99 | * The AudioData must have been previously allocated with ff_audio_data_alloc(). |
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| 100 | * |
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| 101 | * @param a AudioData struct |
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| 102 | * @param nb_samples number of samples to allocate space for |
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| 103 | * @return 0 on success, negative AVERROR value on error |
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| 104 | */ |
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| 105 | int ff_audio_data_realloc(AudioData *a, int nb_samples); |
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| 106 | |||
| 107 | /** |
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| 108 | * Free AudioData. |
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| 109 | * |
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| 110 | * The AudioData must have been previously allocated with ff_audio_data_alloc(). |
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| 111 | * |
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| 112 | * @param a AudioData struct |
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| 113 | */ |
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| 114 | void ff_audio_data_free(AudioData **a); |
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| 115 | |||
| 116 | /** |
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| 117 | * Copy data from one AudioData to another. |
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| 118 | * |
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| 119 | * @param out output AudioData |
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| 120 | * @param in input AudioData |
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| 121 | * @param map channel map, NULL if not remapping |
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| 122 | * @return 0 on success, negative AVERROR value on error |
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| 123 | */ |
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| 124 | int ff_audio_data_copy(AudioData *out, AudioData *in, ChannelMapInfo *map); |
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| 125 | |||
| 126 | /** |
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| 127 | * Append data from one AudioData to the end of another. |
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| 128 | * |
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| 129 | * @param dst destination AudioData |
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| 130 | * @param dst_offset offset, in samples, to start writing, relative to the |
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| 131 | * start of dst |
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| 132 | * @param src source AudioData |
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| 133 | * @param src_offset offset, in samples, to start copying, relative to the |
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| 134 | * start of the src |
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| 135 | * @param nb_samples number of samples to copy |
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| 136 | * @return 0 on success, negative AVERROR value on error |
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| 137 | */ |
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| 138 | int ff_audio_data_combine(AudioData *dst, int dst_offset, AudioData *src, |
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| 139 | int src_offset, int nb_samples); |
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| 140 | |||
| 141 | /** |
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| 142 | * Drain samples from the start of the AudioData. |
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| 143 | * |
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| 144 | * Remaining samples are shifted to the start of the AudioData. |
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| 145 | * |
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| 146 | * @param a AudioData struct |
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| 147 | * @param nb_samples number of samples to drain |
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| 148 | */ |
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| 149 | void ff_audio_data_drain(AudioData *a, int nb_samples); |
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| 150 | |||
| 151 | /** |
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| 152 | * Add samples in AudioData to an AVAudioFifo. |
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| 153 | * |
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| 154 | * @param af Audio FIFO Buffer |
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| 155 | * @param a AudioData struct |
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| 156 | * @param offset number of samples to skip from the start of the data |
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| 157 | * @param nb_samples number of samples to add to the FIFO |
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| 158 | * @return number of samples actually added to the FIFO, or |
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| 159 | * negative AVERROR code on error |
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| 160 | */ |
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| 161 | int ff_audio_data_add_to_fifo(AVAudioFifo *af, AudioData *a, int offset, |
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| 162 | int nb_samples); |
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| 163 | |||
| 164 | /** |
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| 165 | * Read samples from an AVAudioFifo to AudioData. |
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| 166 | * |
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| 167 | * @param af Audio FIFO Buffer |
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| 168 | * @param a AudioData struct |
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| 169 | * @param nb_samples number of samples to read from the FIFO |
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| 170 | * @return number of samples actually read from the FIFO, or |
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| 171 | * negative AVERROR code on error |
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| 172 | */ |
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| 173 | int ff_audio_data_read_from_fifo(AVAudioFifo *af, AudioData *a, int nb_samples); |
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| 174 | |||
| 175 | #endif /* AVRESAMPLE_AUDIO_DATA_H */ |