mpv/audio/format.h

/*
 * The sample format system used lin libaf is based on bitmasks.
 * The format definition only refers to the storage format,
 * not the resolution.
 *
 * This file is part of MPlayer.
 *
 * MPlayer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MPlayer 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef MPLAYER_AF_FORMAT_H
#define MPLAYER_AF_FORMAT_H

#include <stdbool.h>
#include <sys/types.h>

#include "bstr/bstr.h"

#if BYTE_ORDER == BIG_ENDIAN
#define AF_SELECT_LE_BE(LE, BE) BE
#else
#define AF_SELECT_LE_BE(LE, BE) LE
#endif

// Endianness
#define AF_FORMAT_BE            (0<<0) // Big Endian
#define AF_FORMAT_LE            (1<<0) // Little Endian
#define AF_FORMAT_END_MASK      (1<<0)

#define AF_FORMAT_NE AF_SELECT_LE_BE(AF_FORMAT_LE, AF_FORMAT_BE)

// Signed/unsigned
#define AF_FORMAT_SI            (0<<1) // Signed
#define AF_FORMAT_US            (1<<1) // Unsigned
#define AF_FORMAT_SIGN_MASK     (1<<1)

// Bits used
// Some code assumes they're sorted by size.
#define AF_FORMAT_8BIT          (0<<3)
#define AF_FORMAT_16BIT         (1<<3)
#define AF_FORMAT_24BIT         (2<<3)
#define AF_FORMAT_32BIT         (3<<3)
#define AF_FORMAT_64BIT         (4<<3)
#define AF_FORMAT_BITS_MASK     (7<<3)

// Special flags refering to non pcm data (note: 1<<6, 2<<6, 5<<6 unused)
#define AF_FORMAT_S_MPEG2       (3<<6) // MPEG(2) audio
#define AF_FORMAT_S_AC3         (4<<6) // Dolby Digital AC3
#define AF_FORMAT_S_IEC61937    (6<<6)
#define AF_FORMAT_SPECIAL_MASK  (7<<6)

// Fixed or floating point
#define AF_FORMAT_I             (1<<9) // Int
#define AF_FORMAT_F             (2<<9) // Foating point
#define AF_FORMAT_POINT_MASK    (3<<9)

// Interleaving (planar formats have data for each channel in separate planes)
#define AF_FORMAT_INTERLEAVED        (0<<11) // must be 0
#define AF_FORMAT_PLANAR             (1<<11)
#define AF_FORMAT_INTERLEAVING_MASK  (1<<11)

#define AF_FORMAT_MASK          ((1<<12)-1)

#define AF_INTP (AF_FORMAT_I|AF_FORMAT_PLANAR)
#define AF_FLTP (AF_FORMAT_F|AF_FORMAT_PLANAR)

// actual sample formats
enum af_format {
    AF_FORMAT_UNKNOWN   = 0,

    AF_FORMAT_U8        = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_8BIT|AF_FORMAT_NE),
    AF_FORMAT_S8        = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_8BIT|AF_FORMAT_NE),
    AF_FORMAT_U16_LE    = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_16BIT|AF_FORMAT_LE),
    AF_FORMAT_U16_BE    = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_16BIT|AF_FORMAT_BE),
    AF_FORMAT_S16_LE    = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_16BIT|AF_FORMAT_LE),
    AF_FORMAT_S16_BE    = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_16BIT|AF_FORMAT_BE),
    AF_FORMAT_U24_LE    = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_24BIT|AF_FORMAT_LE),
    AF_FORMAT_U24_BE    = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_24BIT|AF_FORMAT_BE),
    AF_FORMAT_S24_LE    = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_24BIT|AF_FORMAT_LE),
    AF_FORMAT_S24_BE    = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_24BIT|AF_FORMAT_BE),
    AF_FORMAT_U32_LE    = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_32BIT|AF_FORMAT_LE),
    AF_FORMAT_U32_BE    = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_32BIT|AF_FORMAT_BE),
    AF_FORMAT_S32_LE    = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_32BIT|AF_FORMAT_LE),
    AF_FORMAT_S32_BE    = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_32BIT|AF_FORMAT_BE),

    AF_FORMAT_FLOAT_LE  = (AF_FORMAT_F|AF_FORMAT_32BIT|AF_FORMAT_LE),
    AF_FORMAT_FLOAT_BE  = (AF_FORMAT_F|AF_FORMAT_32BIT|AF_FORMAT_BE),

    AF_FORMAT_DOUBLE_LE = (AF_FORMAT_F|AF_FORMAT_64BIT|AF_FORMAT_LE),
    AF_FORMAT_DOUBLE_BE = (AF_FORMAT_F|AF_FORMAT_64BIT|AF_FORMAT_BE),

    AF_FORMAT_AC3_LE    = (AF_FORMAT_S_AC3|AF_FORMAT_16BIT|AF_FORMAT_LE),
    AF_FORMAT_AC3_BE    = (AF_FORMAT_S_AC3|AF_FORMAT_16BIT|AF_FORMAT_BE),

    AF_FORMAT_IEC61937_LE = (AF_FORMAT_S_IEC61937|AF_FORMAT_16BIT|AF_FORMAT_LE),
    AF_FORMAT_IEC61937_BE = (AF_FORMAT_S_IEC61937|AF_FORMAT_16BIT|AF_FORMAT_BE),

    AF_FORMAT_MPEG2     = (AF_FORMAT_S_MPEG2),

    // Planar variants
    AF_FORMAT_U8P       = (AF_INTP|AF_FORMAT_US|AF_FORMAT_8BIT|AF_FORMAT_NE),
    AF_FORMAT_S16P      = (AF_INTP|AF_FORMAT_SI|AF_FORMAT_16BIT|AF_FORMAT_NE),
    AF_FORMAT_S32P      = (AF_INTP|AF_FORMAT_SI|AF_FORMAT_32BIT|AF_FORMAT_NE),
    AF_FORMAT_FLOATP    = (AF_FLTP|AF_FORMAT_32BIT|AF_FORMAT_NE),
    AF_FORMAT_DOUBLEP   = (AF_FLTP|AF_FORMAT_64BIT|AF_FORMAT_NE),

    // Native endian variants
    AF_FORMAT_U16       = AF_SELECT_LE_BE(AF_FORMAT_U16_LE, AF_FORMAT_U16_BE),
    AF_FORMAT_S16       = AF_SELECT_LE_BE(AF_FORMAT_S16_LE, AF_FORMAT_S16_BE),
    AF_FORMAT_U24       = AF_SELECT_LE_BE(AF_FORMAT_U24_LE, AF_FORMAT_U24_BE),
    AF_FORMAT_S24       = AF_SELECT_LE_BE(AF_FORMAT_S24_LE, AF_FORMAT_S24_BE),
    AF_FORMAT_U32       = AF_SELECT_LE_BE(AF_FORMAT_U32_LE, AF_FORMAT_U32_BE),
    AF_FORMAT_S32       = AF_SELECT_LE_BE(AF_FORMAT_S32_LE, AF_FORMAT_S32_BE),

    AF_FORMAT_FLOAT     = AF_SELECT_LE_BE(AF_FORMAT_FLOAT_LE, AF_FORMAT_FLOAT_BE),
    AF_FORMAT_DOUBLE    = AF_SELECT_LE_BE(AF_FORMAT_DOUBLE_LE, AF_FORMAT_DOUBLE_BE),

    AF_FORMAT_AC3       = AF_SELECT_LE_BE(AF_FORMAT_AC3_LE, AF_FORMAT_AC3_BE),
    AF_FORMAT_IEC61937  = AF_SELECT_LE_BE(AF_FORMAT_IEC61937_LE, AF_FORMAT_IEC61937_BE),
};

#define AF_FORMAT_IS_AC3(fmt) \
    (((fmt) & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_S_AC3)

#define AF_FORMAT_IS_IEC61937(fmt) \
    (AF_FORMAT_IS_AC3(fmt) ||      \
     ((fmt) & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_S_IEC61937)

#define AF_FORMAT_IS_SPECIAL(fmt) \
    ((fmt & AF_FORMAT_SPECIAL_MASK) != 0)

struct af_fmt_entry {
    const char *name;
    int format;
};

extern const struct af_fmt_entry af_fmtstr_table[];

int af_str2fmt_short(bstr str);
const char *af_fmt_to_str(int format);

int af_fmt2bps(int format);
int af_fmt2bits(int format);
int af_fmt_change_bits(int format, int bits);

int af_fmt_to_planar(int format);
int af_fmt_from_planar(int format);
bool af_fmt_is_planar(int format);

// Amount of bytes that contain audio of the given duration, aligned to frames.
int af_fmt_seconds_to_bytes(int format, float seconds, int channels, int samplerate);

bool af_fmt_is_valid(int format);

void af_fill_silence(void *dst, size_t bytes, int format);

int af_format_conversion_score(int dst_format, int src_format);

#endif /* MPLAYER_AF_FORMAT_H */