mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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258 lines
8.7 KiB
C
258 lines
8.7 KiB
C
/* GStreamer
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* Copyright (C) <2012> Wim Taymans <wim.taymans@gmail.com>
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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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <string.h>
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#include "audio-format.h"
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#define SINT (GST_AUDIO_FORMAT_FLAG_INTEGER | GST_AUDIO_FORMAT_FLAG_SIGNED)
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#define UINT (GST_AUDIO_FORMAT_FLAG_INTEGER)
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#define MAKE_FORMAT(str,desc,flags,end,width,depth,silent) \
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{ GST_AUDIO_FORMAT_ ##str, G_STRINGIFY(str), desc, flags, end, width, depth, silent }
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#define SILENT_0 { 0, 0, 0, 0, 0, 0, 0, 0 }
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#define SILENT_U8 { 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80 }
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#define SILENT_U16LE { 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80 }
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#define SILENT_U16BE { 0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00 }
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#define SILENT_U24_32LE { 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x80, 0x00 }
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#define SILENT_U24_32BE { 0x00, 0x80, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00 }
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#define SILENT_U32LE { 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x80 }
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#define SILENT_U32BE { 0x80, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00 }
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#define SILENT_U24LE { 0x00, 0x00, 0x80, 0x00, 0x00, 0x80 }
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#define SILENT_U24BE { 0x80, 0x00, 0x00, 0x80, 0x00, 0x00 }
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#define SILENT_U20LE { 0x00, 0x00, 0x08, 0x00, 0x00, 0x08 }
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#define SILENT_U20BE { 0x08, 0x00, 0x00, 0x08, 0x00, 0x00 }
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#define SILENT_U18LE { 0x00, 0x00, 0x02, 0x00, 0x00, 0x02 }
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#define SILENT_U18BE { 0x02, 0x00, 0x00, 0x02, 0x00, 0x00 }
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static GstAudioFormatInfo formats[] = {
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{GST_AUDIO_FORMAT_UNKNOWN, "UNKNOWN", "Unknown audio", 0, 0, 0, 0},
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{GST_AUDIO_FORMAT_ENCODED, "ENCODED", "Encoded audio",
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GST_AUDIO_FORMAT_FLAG_COMPLEX, 0, 0, 0},
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/* 8 bit */
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MAKE_FORMAT (S8, "8-bit signed PCM audio", SINT, 0, 8, 8, SILENT_0),
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MAKE_FORMAT (U8, "8-bit unsigned PCM audio", UINT, 0, 8, 8, SILENT_U8),
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/* 16 bit */
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MAKE_FORMAT (S16LE, "16-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 16, 16,
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SILENT_0),
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MAKE_FORMAT (S16BE, "16-bit signed PCM audio", SINT, G_BIG_ENDIAN, 16, 16,
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SILENT_0),
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MAKE_FORMAT (U16LE, "16-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 16,
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16, SILENT_U16LE),
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MAKE_FORMAT (U16BE, "16-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 16, 16,
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SILENT_U16BE),
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/* 24 bit in low 3 bytes of 32 bits */
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MAKE_FORMAT (S24_32LE, "24-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 32,
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24, SILENT_0),
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MAKE_FORMAT (S24_32BE, "24-bit signed PCM audio", SINT, G_BIG_ENDIAN, 32, 24,
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SILENT_0),
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MAKE_FORMAT (U24_32LE, "24-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 32,
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24, SILENT_U24_32LE),
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MAKE_FORMAT (U24_32BE, "24-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 32,
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24, SILENT_U24_32BE),
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/* 32 bit */
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MAKE_FORMAT (S32LE, "32-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 32, 32,
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SILENT_0),
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MAKE_FORMAT (S32BE, "32-bit signed PCM audio", SINT, G_BIG_ENDIAN, 32, 32,
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SILENT_0),
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MAKE_FORMAT (U32LE, "32-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 32,
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32, SILENT_U32LE),
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MAKE_FORMAT (U32BE, "32-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 32, 32,
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SILENT_U32BE),
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/* 24 bit in 3 bytes */
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MAKE_FORMAT (S24LE, "24-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 24, 24,
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SILENT_0),
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MAKE_FORMAT (S24BE, "24-bit signed PCM audio", SINT, G_BIG_ENDIAN, 24, 24,
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SILENT_0),
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MAKE_FORMAT (U24LE, "24-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 24,
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24, SILENT_U24LE),
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MAKE_FORMAT (U24BE, "24-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 24, 24,
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SILENT_U24BE),
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/* 20 bit in 3 bytes */
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MAKE_FORMAT (S20LE, "20-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 24, 20,
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SILENT_0),
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MAKE_FORMAT (S20BE, "20-bit signed PCM audio", SINT, G_BIG_ENDIAN, 24, 20,
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SILENT_0),
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MAKE_FORMAT (U20LE, "20-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 24,
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20, SILENT_U20LE),
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MAKE_FORMAT (U20BE, "20-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 24, 20,
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SILENT_U20BE),
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/* 18 bit in 3 bytes */
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MAKE_FORMAT (S18LE, "18-bit signed PCM audio", SINT, G_LITTLE_ENDIAN, 24, 18,
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SILENT_0),
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MAKE_FORMAT (S18BE, "18-bit signed PCM audio", SINT, G_BIG_ENDIAN, 24, 18,
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SILENT_0),
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MAKE_FORMAT (U18LE, "18-bit unsigned PCM audio", UINT, G_LITTLE_ENDIAN, 24,
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18, SILENT_U18LE),
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MAKE_FORMAT (U18BE, "18-bit unsigned PCM audio", UINT, G_BIG_ENDIAN, 24, 18,
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SILENT_U18BE),
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/* float */
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MAKE_FORMAT (F32LE, "32-bit floating-point audio",
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GST_AUDIO_FORMAT_FLAG_FLOAT, G_LITTLE_ENDIAN, 32, 32,
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SILENT_0),
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MAKE_FORMAT (F32BE, "32-bit floating-point audio",
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GST_AUDIO_FORMAT_FLAG_FLOAT, G_BIG_ENDIAN, 32, 32,
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SILENT_0),
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MAKE_FORMAT (F64LE, "64-bit floating-point audio",
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GST_AUDIO_FORMAT_FLAG_FLOAT, G_LITTLE_ENDIAN, 64, 64,
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SILENT_0),
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MAKE_FORMAT (F64BE, "64-bit floating-point audio",
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GST_AUDIO_FORMAT_FLAG_FLOAT, G_BIG_ENDIAN, 64, 64,
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SILENT_0)
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};
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G_DEFINE_POINTER_TYPE (GstAudioFormatInfo, gst_audio_format_info);
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/**
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* gst_audio_format_build_integer:
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* @sign: signed or unsigned format
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* @endianness: G_LITTLE_ENDIAN or G_BIG_ENDIAN
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* @width: amount of bits used per sample
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* @depth: amount of used bits in @width
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*
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* Construct a #GstAudioFormat with given parameters.
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*
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* Returns: a #GstAudioFormat or GST_AUDIO_FORMAT_UNKNOWN when no audio format
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* exists with the given parameters.
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*/
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GstAudioFormat
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gst_audio_format_build_integer (gboolean sign, gint endianness,
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gint width, gint depth)
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{
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gint i, e;
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for (i = 0; i < G_N_ELEMENTS (formats); i++) {
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GstAudioFormatInfo *finfo = &formats[i];
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/* must be int */
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if (!GST_AUDIO_FORMAT_INFO_IS_INTEGER (finfo))
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continue;
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/* width and depth must match */
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if (width != GST_AUDIO_FORMAT_INFO_WIDTH (finfo))
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continue;
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if (depth != GST_AUDIO_FORMAT_INFO_DEPTH (finfo))
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continue;
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/* if there is endianness, it must match */
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e = GST_AUDIO_FORMAT_INFO_ENDIANNESS (finfo);
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if (e && e != endianness)
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continue;
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/* check sign */
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if ((sign && !GST_AUDIO_FORMAT_INFO_IS_SIGNED (finfo)) ||
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(!sign && GST_AUDIO_FORMAT_INFO_IS_SIGNED (finfo)))
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continue;
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return GST_AUDIO_FORMAT_INFO_FORMAT (finfo);
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}
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return GST_AUDIO_FORMAT_UNKNOWN;
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}
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/**
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* gst_audio_format_from_string:
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* @format: a format string
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*
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* Convert the @format string to its #GstAudioFormat.
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*
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* Returns: the #GstAudioFormat for @format or GST_AUDIO_FORMAT_UNKNOWN when the
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* string is not a known format.
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*/
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GstAudioFormat
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gst_audio_format_from_string (const gchar * format)
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{
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guint i;
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for (i = 0; i < G_N_ELEMENTS (formats); i++) {
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if (strcmp (GST_AUDIO_FORMAT_INFO_NAME (&formats[i]), format) == 0)
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return GST_AUDIO_FORMAT_INFO_FORMAT (&formats[i]);
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}
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return GST_AUDIO_FORMAT_UNKNOWN;
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}
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const gchar *
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gst_audio_format_to_string (GstAudioFormat format)
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{
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g_return_val_if_fail (format != GST_AUDIO_FORMAT_UNKNOWN, NULL);
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if (format >= G_N_ELEMENTS (formats))
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return NULL;
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return GST_AUDIO_FORMAT_INFO_NAME (&formats[format]);
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}
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/**
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* gst_audio_format_get_info:
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* @format: a #GstAudioFormat
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*
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* Get the #GstAudioFormatInfo for @format
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*
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* Returns: The #GstAudioFormatInfo for @format.
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*/
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const GstAudioFormatInfo *
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gst_audio_format_get_info (GstAudioFormat format)
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{
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g_return_val_if_fail (format < G_N_ELEMENTS (formats), NULL);
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return &formats[format];
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}
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/**
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* gst_audio_format_fill_silence:
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* @info: a #GstAudioFormatInfo
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* @dest: a destination to fill
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* @length: the length to fill
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*
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* Fill @length bytes in @dest with silence samples for @info.
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*/
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void
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gst_audio_format_fill_silence (const GstAudioFormatInfo * info,
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gpointer dest, gsize length)
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{
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guint8 *dptr = dest;
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g_return_if_fail (info != NULL);
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g_return_if_fail (dest != NULL);
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if (info->flags & GST_AUDIO_FORMAT_FLAG_FLOAT ||
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info->flags & GST_AUDIO_FORMAT_FLAG_SIGNED) {
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/* float or signed always 0 */
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memset (dest, 0, length);
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} else {
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gint i, j, bps = info->width >> 3;
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switch (bps) {
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case 1:
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memset (dest, info->silence[0], length);
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break;
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default:
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for (i = 0; i < length; i += bps) {
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for (j = 0; j < bps; j++)
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*dptr++ = info->silence[j];
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}
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break;
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}
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}
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}
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