2b626a5adf
Rework the converter to use the pack/unpack functions Because the unpack functions can only unpack to 1 format, add a separate conversion step for doubles when the unpack function produces int. Do conversion to S32 in the quantize function directly. Tweak the conversion factor for doing float->int conversion slightly to get the full range of negative samples, use clamp to make sure we don't exceed our int range on the positive axis (see also #755301)
145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
/* GStreamer
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* Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* audioconvert.h: audio format conversion library
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __AUDIO_CONVERT_H__
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#define __AUDIO_CONVERT_H__
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#include <gst/gst.h>
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#include <gst/audio/audio.h>
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GST_DEBUG_CATEGORY_EXTERN (audio_convert_debug);
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#define GST_CAT_DEFAULT (audio_convert_debug)
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/**
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* GstAudioConvertDithering:
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* @DITHER_NONE: No dithering
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* @DITHER_RPDF: Rectangular dithering
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* @DITHER_TPDF: Triangular dithering (default)
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* @DITHER_TPDF_HF: High frequency triangular dithering
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*
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* Set of available dithering methods when converting audio.
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*/
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typedef enum
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{
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DITHER_NONE = 0,
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DITHER_RPDF,
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DITHER_TPDF,
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DITHER_TPDF_HF
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} GstAudioConvertDithering;
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/**
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* GstAudioConvertNoiseShaping:
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* @NOISE_SHAPING_NONE: No noise shaping (default)
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* @NOISE_SHAPING_ERROR_FEEDBACK: Error feedback
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* @NOISE_SHAPING_SIMPLE: Simple 2-pole noise shaping
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* @NOISE_SHAPING_MEDIUM: Medium 5-pole noise shaping
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* @NOISE_SHAPING_HIGH: High 8-pole noise shaping
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*
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* Set of available noise shaping methods
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*/
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typedef enum
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{
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NOISE_SHAPING_NONE = 0,
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NOISE_SHAPING_ERROR_FEEDBACK,
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NOISE_SHAPING_SIMPLE,
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NOISE_SHAPING_MEDIUM,
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NOISE_SHAPING_HIGH
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} GstAudioConvertNoiseShaping;
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typedef struct _AudioConvertCtx AudioConvertCtx;
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#if 0
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typedef struct _AudioConvertFmt AudioConvertFmt;
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struct _AudioConvertFmt
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{
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/* general caps */
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gboolean is_int;
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gint endianness;
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gint width;
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gint rate;
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gint channels;
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GstAudioChannelPosition *pos;
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gboolean unpositioned_layout;
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/* int audio caps */
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gboolean sign;
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gint depth;
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gint unit_size;
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};
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#endif
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typedef void (*AudioConvertMix) (AudioConvertCtx *, gpointer, gpointer, gint);
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typedef void (*AudioConvertQuantize) (AudioConvertCtx * ctx, gpointer src,
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gpointer dst, gint count);
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typedef void (*AudioConvertToF64) (gdouble *dst, const gint32 *src, gint count);
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struct _AudioConvertCtx
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{
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GstAudioInfo in;
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GstAudioInfo out;
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/* channel conversion matrix, m[in_channels][out_channels].
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* If identity matrix, passthrough applies. */
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gfloat **matrix;
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/* channel conversion matrix with int values, m[in_channels][out_channels].
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* this is matrix * (2^10) as integers */
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gint **matrix_int;
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/* temp storage for channelmix */
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gpointer tmp;
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gboolean in_default;
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gboolean mix_passthrough;
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gboolean quant_default;
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gboolean out_default;
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gpointer tmpbuf;
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gint tmpbufsize;
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gint out_scale;
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AudioConvertToF64 convert;
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AudioConvertMix channel_mix;
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AudioConvertQuantize quantize;
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GstAudioConvertDithering dither;
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GstAudioConvertNoiseShaping ns;
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/* last random number generated per channel for hifreq TPDF dither */
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gpointer last_random;
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/* contains the past quantization errors, error[out_channels][count] */
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gdouble *error_buf;
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};
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gboolean audio_convert_prepare_context (AudioConvertCtx * ctx,
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GstAudioInfo * in, GstAudioInfo * out,
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GstAudioConvertDithering dither, GstAudioConvertNoiseShaping ns);
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gboolean audio_convert_get_sizes (AudioConvertCtx * ctx, gint samples,
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gint * srcsize, gint * dstsize);
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gboolean audio_convert_clean_context (AudioConvertCtx * ctx);
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gboolean audio_convert_convert (AudioConvertCtx * ctx, gpointer src,
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gpointer dst, gint samples, gboolean src_writable);
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#endif /* __AUDIO_CONVERT_H__ */
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