diff options
Diffstat (limited to 'chromium/third_party/ffmpeg/libavutil/tx.h')
-rw-r--r-- | chromium/third_party/ffmpeg/libavutil/tx.h | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/chromium/third_party/ffmpeg/libavutil/tx.h b/chromium/third_party/ffmpeg/libavutil/tx.h new file mode 100644 index 00000000000..b1f2d963533 --- /dev/null +++ b/chromium/third_party/ffmpeg/libavutil/tx.h @@ -0,0 +1,81 @@ +/* + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVUTIL_TX_H +#define AVUTIL_TX_H + +#include <stdint.h> +#include <stddef.h> + +typedef struct AVTXContext AVTXContext; + +typedef struct AVComplexFloat { + float re, im; +} AVComplexFloat; + +enum AVTXType { + /** + * Standard complex to complex FFT with sample data type AVComplexFloat. + * Scaling currently unsupported + */ + AV_TX_FLOAT_FFT = 0, + /** + * Standard MDCT with sample data type of float and a scale type of + * float. Length is the frame size, not the window size (which is 2x frame) + */ + AV_TX_FLOAT_MDCT = 1, +}; + +/** + * Function pointer to a function to perform the transform. + * + * @note Using a different context than the one allocated during av_tx_init() + * is not allowed. + * + * @param s the transform context + * @param out the output array + * @param in the input array + * @param stride the input or output stride (depending on transform direction) + * in bytes, currently implemented for all MDCT transforms + */ +typedef void (*av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride); + +/** + * Initialize a transform context with the given configuration + * Currently power of two lengths from 4 to 131072 are supported, along with + * any length decomposable to a power of two and either 3, 5 or 15. + * + * @param ctx the context to allocate, will be NULL on error + * @param tx pointer to the transform function pointer to set + * @param type type the type of transform + * @param inv whether to do an inverse or a forward transform + * @param len the size of the transform in samples + * @param scale pointer to the value to scale the output if supported by type + * @param flags currently unused + * + * @return 0 on success, negative error code on failure + */ +int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type, + int inv, int len, const void *scale, uint64_t flags); + +/** + * Frees a context and sets ctx to NULL, does nothing when ctx == NULL + */ +void av_tx_uninit(AVTXContext **ctx); + +#endif /* AVUTIL_TX_H */ |