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831d7c3c40
They are useless. Not only are they actually rarely in use; but libavcodec doesn't even output them, as libavcodec has no such sample formats for decoded audio. Even if it should happen that we actually still need them (e.g. if doing direct hardware output), there are better solutions. Swapping the sign is a fast and lossless operation and can be done inplace, so AO actually needing it could do this directly. If you wonder why we keep U8 instead of S8: because libavcodec does it.
124 lines
4.1 KiB
C
124 lines
4.1 KiB
C
/*
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* The sample format system used lin libaf is based on bitmasks.
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* The format definition only refers to the storage format,
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* not the resolution.
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*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mpv 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MPLAYER_AF_FORMAT_H
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#define MPLAYER_AF_FORMAT_H
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#include <stdbool.h>
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#include "misc/bstr.h"
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// Bits used
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// Some code assumes they're sorted by size.
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#define AF_FORMAT_8BIT (0<<1)
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#define AF_FORMAT_16BIT (1<<1)
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#define AF_FORMAT_24BIT (2<<1)
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#define AF_FORMAT_32BIT (3<<1)
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#define AF_FORMAT_64BIT (4<<1)
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#define AF_FORMAT_BITS_MASK (7<<1)
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// Fixed/floating point/special
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#define AF_FORMAT_I (1<<4) // Int
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#define AF_FORMAT_F (2<<4) // Foating point
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#define AF_FORMAT_S (4<<4) // special (IEC61937)
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#define AF_FORMAT_TYPE_MASK (7<<4)
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// Interleaving (planar formats have data for each channel in separate planes)
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#define AF_FORMAT_INTERLEAVED (0<<7) // must be 0
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#define AF_FORMAT_PLANAR (1<<7)
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#define AF_FORMAT_INTERLEAVING_MASK (1<<7)
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#define AF_FORMAT_S_CODEC(n) ((n)<<8)
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#define AF_FORMAT_S_CODEC_MASK (15 <<8) // 16 codecs max.
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#define AF_FORMAT_MASK ((1<<12)-1)
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#define AF_INTP (AF_FORMAT_I|AF_FORMAT_PLANAR)
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#define AF_FLTP (AF_FORMAT_F|AF_FORMAT_PLANAR)
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#define AF_FORMAT_S_(n) (AF_FORMAT_S_CODEC(n)|AF_FORMAT_S|AF_FORMAT_16BIT)
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// actual sample formats
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enum af_format {
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AF_FORMAT_UNKNOWN = 0,
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AF_FORMAT_U8 = AF_FORMAT_I|AF_FORMAT_8BIT,
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AF_FORMAT_S16 = AF_FORMAT_I|AF_FORMAT_16BIT,
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AF_FORMAT_S24 = AF_FORMAT_I|AF_FORMAT_24BIT,
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AF_FORMAT_S32 = AF_FORMAT_I|AF_FORMAT_32BIT,
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AF_FORMAT_FLOAT = AF_FORMAT_F|AF_FORMAT_32BIT,
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AF_FORMAT_DOUBLE = AF_FORMAT_F|AF_FORMAT_64BIT,
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// Planar variants
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AF_FORMAT_U8P = AF_INTP|AF_FORMAT_8BIT,
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AF_FORMAT_S16P = AF_INTP|AF_FORMAT_16BIT,
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AF_FORMAT_S32P = AF_INTP|AF_FORMAT_32BIT,
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AF_FORMAT_FLOATP = AF_FLTP|AF_FORMAT_32BIT,
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AF_FORMAT_DOUBLEP = AF_FLTP|AF_FORMAT_64BIT,
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// All of these use IEC61937 framing, and otherwise pretend to be like PCM.
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AF_FORMAT_S_AAC = AF_FORMAT_S_(0),
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AF_FORMAT_S_AC3 = AF_FORMAT_S_(1),
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AF_FORMAT_S_DTS = AF_FORMAT_S_(2),
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AF_FORMAT_S_DTSHD = AF_FORMAT_S_(3),
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AF_FORMAT_S_EAC3 = AF_FORMAT_S_(4),
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AF_FORMAT_S_MP3 = AF_FORMAT_S_(5),
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AF_FORMAT_S_TRUEHD = AF_FORMAT_S_(6),
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};
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#define AF_FORMAT_IS_IEC61937(f) (((f) & AF_FORMAT_TYPE_MASK) == AF_FORMAT_S)
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#define AF_FORMAT_IS_SPECIAL(f) AF_FORMAT_IS_IEC61937(f)
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#define AF_FORMAT_IS_FLOAT(f) (!!((f) & AF_FORMAT_F))
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// false for interleaved and AF_FORMAT_UNKNOWN
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#define AF_FORMAT_IS_PLANAR(f) (!!((f) & AF_FORMAT_PLANAR))
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struct af_fmt_entry {
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const char *name;
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int format;
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};
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extern const struct af_fmt_entry af_fmtstr_table[];
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int af_str2fmt_short(bstr str);
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const char *af_fmt_to_str(int format);
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int af_fmt2bps(int format);
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int af_fmt2bits(int format);
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int af_fmt_change_bits(int format, int bits);
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bool af_fmt_unsigned(int format);
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int af_fmt_to_planar(int format);
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int af_fmt_from_planar(int format);
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// Amount of bytes that contain audio of the given duration, aligned to frames.
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int af_fmt_seconds_to_bytes(int format, float seconds, int channels, int samplerate);
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bool af_fmt_is_valid(int format);
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void af_fill_silence(void *dst, size_t bytes, int format);
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int af_format_conversion_score(int dst_format, int src_format);
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int af_format_sample_alignment(int format);
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#endif /* MPLAYER_AF_FORMAT_H */
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