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dbb857b93b
Original commit message from CVS: * gst/audioconvert/Makefile.am: * gst/audioconvert/audioconvert.c: (audio_convert_get_func_index), (check_default), (audio_convert_prepare_context), (audio_convert_clean_context), (audio_convert_convert): * gst/audioconvert/audioconvert.h: * gst/audioconvert/gstaudioconvert.c: (gst_audio_convert_dithering_get_type), (gst_audio_convert_ns_get_type), (gst_audio_convert_class_init), (gst_audio_convert_init), (gst_audio_convert_set_caps), (gst_audio_convert_set_property), (gst_audio_convert_get_property): * gst/audioconvert/gstaudioconvert.h: * gst/audioconvert/gstaudioquantize.c: (gst_audio_quantize_setup_noise_shaping), (gst_audio_quantize_free_noise_shaping), (gst_audio_quantize_setup_dither), (gst_audio_quantize_free_dither), (gst_audio_quantize_setup_quantize_func), (gst_audio_quantize_setup), (gst_audio_quantize_free): * gst/audioconvert/gstaudioquantize.h: Implement dithering and noise shaping in audioconvert. By default now TPDF dithering (and no noise shaping) will be used when converting from a higher bit depth to 20 bit depth or smaller, otherwise everything will be as it is now. For the last audioconvert in a pipeline it would make sense to use some kind of noise shaping, enabling it by default for all conversions would give undesired results though. Fixes #360246. * tests/check/elements/audioconvert.c: (setup_audioconvert), (GST_START_TEST): Adjust unit test for the new audioconvert.
124 lines
3.3 KiB
C
124 lines
3.3 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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/multichannel.h>
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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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} DitherType;
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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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} NoiseShapingType;
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typedef struct _AudioConvertCtx AudioConvertCtx;
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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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/* 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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typedef void (*AudioConvertUnpack) (gpointer src, gpointer dst, gint scale,
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gint count);
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typedef void (*AudioConvertPack) (gpointer src, gpointer dst, gint scale,
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gint count);
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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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struct _AudioConvertCtx
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{
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AudioConvertFmt in;
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AudioConvertFmt out;
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AudioConvertUnpack unpack;
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AudioConvertPack pack;
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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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/* 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 out_default;
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gpointer tmpbuf;
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gint tmpbufsize;
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gint in_scale;
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gint out_scale;
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AudioConvertMix channel_mix;
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AudioConvertQuantize quantize;
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DitherType dither;
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NoiseShapingType ns;
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/* random number generate for dither noise */
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GRand *dither_random;
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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_clean_fmt (AudioConvertFmt * fmt);
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gboolean audio_convert_prepare_context (AudioConvertCtx * ctx,
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AudioConvertFmt * in, AudioConvertFmt * out, DitherType dither,
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NoiseShapingType 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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