summaryrefslogtreecommitdiff
path: root/libswresample/swresample_internal.h
diff options
context:
space:
mode:
Diffstat (limited to 'libswresample/swresample_internal.h')
-rw-r--r--libswresample/swresample_internal.h199
1 files changed, 199 insertions, 0 deletions
diff --git a/libswresample/swresample_internal.h b/libswresample/swresample_internal.h
new file mode 100644
index 0000000000..ab19f212fe
--- /dev/null
+++ b/libswresample/swresample_internal.h
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2011-2013 Michael Niedermayer (michaelni@gmx.at)
+ *
+ * This file is part of libswresample
+ *
+ * libswresample 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.
+ *
+ * libswresample 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 libswresample; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef SWR_INTERNAL_H
+#define SWR_INTERNAL_H
+
+#include "swresample.h"
+#include "libavutil/channel_layout.h"
+#include "config.h"
+
+#define SQRT3_2 1.22474487139158904909 /* sqrt(3/2) */
+
+#define NS_TAPS 20
+
+#if ARCH_X86_64
+typedef int64_t integer;
+#else
+typedef int integer;
+#endif
+
+typedef void (mix_1_1_func_type)(void *out, const void *in, void *coeffp, integer index, integer len);
+typedef void (mix_2_1_func_type)(void *out, const void *in1, const void *in2, void *coeffp, integer index1, integer index2, integer len);
+
+typedef void (mix_any_func_type)(uint8_t **out, const uint8_t **in1, void *coeffp, integer len);
+
+typedef struct AudioData{
+ uint8_t *ch[SWR_CH_MAX]; ///< samples buffer per channel
+ uint8_t *data; ///< samples buffer
+ int ch_count; ///< number of channels
+ int bps; ///< bytes per sample
+ int count; ///< number of samples
+ int planar; ///< 1 if planar audio, 0 otherwise
+ enum AVSampleFormat fmt; ///< sample format
+} AudioData;
+
+struct DitherContext {
+ enum SwrDitherType method;
+ int noise_pos;
+ float scale;
+ float noise_scale; ///< Noise scale
+ int ns_taps; ///< Noise shaping dither taps
+ float ns_scale; ///< Noise shaping dither scale
+ float ns_scale_1; ///< Noise shaping dither scale^-1
+ int ns_pos; ///< Noise shaping dither position
+ float ns_coeffs[NS_TAPS]; ///< Noise shaping filter coefficients
+ float ns_errors[SWR_CH_MAX][2*NS_TAPS];
+ AudioData noise; ///< noise used for dithering
+ AudioData temp; ///< temporary storage when writing into the input buffer isnt possible
+ int output_sample_bits; ///< the number of used output bits, needed to scale dither correctly
+};
+
+struct SwrContext {
+ const AVClass *av_class; ///< AVClass used for AVOption and av_log()
+ int log_level_offset; ///< logging level offset
+ void *log_ctx; ///< parent logging context
+ enum AVSampleFormat in_sample_fmt; ///< input sample format
+ enum AVSampleFormat int_sample_fmt; ///< internal sample format (AV_SAMPLE_FMT_FLTP or AV_SAMPLE_FMT_S16P)
+ enum AVSampleFormat out_sample_fmt; ///< output sample format
+ int64_t in_ch_layout; ///< input channel layout
+ int64_t out_ch_layout; ///< output channel layout
+ int in_sample_rate; ///< input sample rate
+ int out_sample_rate; ///< output sample rate
+ int flags; ///< miscellaneous flags such as SWR_FLAG_RESAMPLE
+ float slev; ///< surround mixing level
+ float clev; ///< center mixing level
+ float lfe_mix_level; ///< LFE mixing level
+ float rematrix_volume; ///< rematrixing volume coefficient
+ float rematrix_maxval; ///< maximum value for rematrixing output
+ enum AVMatrixEncoding matrix_encoding; /**< matrixed stereo encoding */
+ const int *channel_map; ///< channel index (or -1 if muted channel) map
+ int used_ch_count; ///< number of used input channels (mapped channel count if channel_map, otherwise in.ch_count)
+ enum SwrEngine engine;
+
+ struct DitherContext dither;
+
+ int filter_size; /**< length of each FIR filter in the resampling filterbank relative to the cutoff frequency */
+ int phase_shift; /**< log2 of the number of entries in the resampling polyphase filterbank */
+ int linear_interp; /**< if 1 then the resampling FIR filter will be linearly interpolated */
+ double cutoff; /**< resampling cutoff frequency (swr: 6dB point; soxr: 0dB point). 1.0 corresponds to half the output sample rate */
+ enum SwrFilterType filter_type; /**< swr resampling filter type */
+ int kaiser_beta; /**< swr beta value for Kaiser window (only applicable if filter_type == AV_FILTER_TYPE_KAISER) */
+ double precision; /**< soxr resampling precision (in bits) */
+ int cheby; /**< soxr: if 1 then passband rolloff will be none (Chebyshev) & irrational ratio approximation precision will be higher */
+
+ float min_compensation; ///< swr minimum below which no compensation will happen
+ float min_hard_compensation; ///< swr minimum below which no silence inject / sample drop will happen
+ float soft_compensation_duration; ///< swr duration over which soft compensation is applied
+ float max_soft_compensation; ///< swr maximum soft compensation in seconds over soft_compensation_duration
+ float async; ///< swr simple 1 parameter async, similar to ffmpegs -async
+ int64_t firstpts_in_samples; ///< swr first pts in samples
+
+ int resample_first; ///< 1 if resampling must come first, 0 if rematrixing
+ int rematrix; ///< flag to indicate if rematrixing is needed (basically if input and output layouts mismatch)
+ int rematrix_custom; ///< flag to indicate that a custom matrix has been defined
+
+ AudioData in; ///< input audio data
+ AudioData postin; ///< post-input audio data: used for rematrix/resample
+ AudioData midbuf; ///< intermediate audio data (postin/preout)
+ AudioData preout; ///< pre-output audio data: used for rematrix/resample
+ AudioData out; ///< converted output audio data
+ AudioData in_buffer; ///< cached audio data (convert and resample purpose)
+ AudioData silence; ///< temporary with silence
+ AudioData drop_temp; ///< temporary used to discard output
+ int in_buffer_index; ///< cached buffer position
+ int in_buffer_count; ///< cached buffer length
+ int resample_in_constraint; ///< 1 if the input end was reach before the output end, 0 otherwise
+ int flushed; ///< 1 if data is to be flushed and no further input is expected
+ int64_t outpts; ///< output PTS
+ int64_t firstpts; ///< first PTS
+ int drop_output; ///< number of output samples to drop
+
+ struct AudioConvert *in_convert; ///< input conversion context
+ struct AudioConvert *out_convert; ///< output conversion context
+ struct AudioConvert *full_convert; ///< full conversion context (single conversion for input and output)
+ struct ResampleContext *resample; ///< resampling context
+ struct Resampler const *resampler; ///< resampler virtual function table
+
+ float matrix[SWR_CH_MAX][SWR_CH_MAX]; ///< floating point rematrixing coefficients
+ uint8_t *native_matrix;
+ uint8_t *native_one;
+ uint8_t *native_simd_one;
+ uint8_t *native_simd_matrix;
+ int32_t matrix32[SWR_CH_MAX][SWR_CH_MAX]; ///< 17.15 fixed point rematrixing coefficients
+ uint8_t matrix_ch[SWR_CH_MAX][SWR_CH_MAX+1]; ///< Lists of input channels per output channel that have non zero rematrixing coefficients
+ mix_1_1_func_type *mix_1_1_f;
+ mix_1_1_func_type *mix_1_1_simd;
+
+ mix_2_1_func_type *mix_2_1_f;
+ mix_2_1_func_type *mix_2_1_simd;
+
+ mix_any_func_type *mix_any_f;
+
+ /* TODO: callbacks for ASM optimizations */
+};
+
+typedef struct ResampleContext * (* resample_init_func)(struct ResampleContext *c, int out_rate, int in_rate, int filter_size, int phase_shift, int linear,
+ double cutoff, enum AVSampleFormat format, enum SwrFilterType filter_type, int kaiser_beta, double precision, int cheby);
+typedef void (* resample_free_func)(struct ResampleContext **c);
+typedef int (* multiple_resample_func)(struct ResampleContext *c, AudioData *dst, int dst_size, AudioData *src, int src_size, int *consumed);
+typedef int (* resample_flush_func)(struct SwrContext *c);
+typedef int (* set_compensation_func)(struct ResampleContext *c, int sample_delta, int compensation_distance);
+typedef int64_t (* get_delay_func)(struct SwrContext *s, int64_t base);
+
+struct Resampler {
+ resample_init_func init;
+ resample_free_func free;
+ multiple_resample_func multiple_resample;
+ resample_flush_func flush;
+ set_compensation_func set_compensation;
+ get_delay_func get_delay;
+};
+
+extern struct Resampler const swri_resampler;
+
+int swri_realloc_audio(AudioData *a, int count);
+int swri_resample_int16(struct ResampleContext *c, int16_t *dst, const int16_t *src, int *consumed, int src_size, int dst_size, int update_ctx);
+int swri_resample_int32(struct ResampleContext *c, int32_t *dst, const int32_t *src, int *consumed, int src_size, int dst_size, int update_ctx);
+int swri_resample_float(struct ResampleContext *c, float *dst, const float *src, int *consumed, int src_size, int dst_size, int update_ctx);
+int swri_resample_double(struct ResampleContext *c,double *dst, const double *src, int *consumed, int src_size, int dst_size, int update_ctx);
+
+void swri_noise_shaping_int16 (SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
+void swri_noise_shaping_int32 (SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
+void swri_noise_shaping_float (SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
+void swri_noise_shaping_double(SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count);
+
+int swri_rematrix_init(SwrContext *s);
+void swri_rematrix_free(SwrContext *s);
+int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy);
+void swri_rematrix_init_x86(struct SwrContext *s);
+
+void swri_get_dither(SwrContext *s, void *dst, int len, unsigned seed, enum AVSampleFormat noise_fmt);
+int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt);
+
+void swri_audio_convert_init_arm(struct AudioConvert *ac,
+ enum AVSampleFormat out_fmt,
+ enum AVSampleFormat in_fmt,
+ int channels);
+void swri_audio_convert_init_x86(struct AudioConvert *ac,
+ enum AVSampleFormat out_fmt,
+ enum AVSampleFormat in_fmt,
+ int channels);
+#endif