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https://github.com/mpv-player/mpv
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3f7e1f0492
The added function af_format_conversion_score() can be used to select
the best sample format to convert to in order to reduce loss and extra
conversion work.
It calculates a "loss" score when going from one format to another, and
for each conversion that needs to be done a certain score is subtracted.
Thus, if you have to convert from one format to a set of other formats,
you can calculate the score for each conversion, and pick the one with
the highest score.
Conversion between int and float is considered the worst case. One odd
consequence is that when converting from s32 to u8 or float, u8 will be
picked.
Test program used to develop this follows:
#define MAX_FMT 200
struct entry {
const char *name;
int score;
};
static int compentry(const void *px1, const void *px2)
{
const struct entry *x1 = px1;
const struct entry *x2 = px2;
if (x1->score > x2->score)
return 1;
if (x1->score < x2->score)
return -1;
return 0;
}
int main(int argc, char *argv[])
{
for (int n = 0; af_fmtstr_table[n].name; n++) {
struct entry entry[MAX_FMT];
int entries = 0;
for (int i = 0; af_fmtstr_table[i].name; i++) {
assert(i < MAX_FMT);
entry[entries].name = af_fmtstr_table[i].name;
entry[entries].score =
af_format_conversion_score(af_fmtstr_table[i].format,
af_fmtstr_table[n].format);
entries++;
}
qsort(&entry[0], entries, sizeof(entry[0]), compentry);
for (int i = 0; i < entries; i++) {
printf("%s -> %s: %d \n", af_fmtstr_table[n].name,
entry[i].name, entry[i].score);
}
}
}
171 lines
6.6 KiB
C
171 lines
6.6 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 MPlayer.
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*
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* MPlayer 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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* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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 <sys/types.h>
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#include "config.h"
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#include "mpvcore/bstr.h"
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#if BYTE_ORDER == BIG_ENDIAN
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#define AF_SELECT_LE_BE(LE, BE) BE
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#else
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#define AF_SELECT_LE_BE(LE, BE) LE
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#endif
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// Endianness
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#define AF_FORMAT_BE (0<<0) // Big Endian
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#define AF_FORMAT_LE (1<<0) // Little Endian
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#define AF_FORMAT_END_MASK (1<<0)
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#define AF_FORMAT_NE AF_SELECT_LE_BE(AF_FORMAT_LE, AF_FORMAT_BE)
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// Signed/unsigned
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#define AF_FORMAT_SI (0<<1) // Signed
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#define AF_FORMAT_US (1<<1) // Unsigned
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#define AF_FORMAT_SIGN_MASK (1<<1)
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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<<3)
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#define AF_FORMAT_16BIT (1<<3)
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#define AF_FORMAT_24BIT (2<<3)
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#define AF_FORMAT_32BIT (3<<3)
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#define AF_FORMAT_64BIT (4<<3)
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#define AF_FORMAT_BITS_MASK (7<<3)
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// Special flags refering to non pcm data (note: 1<<6, 2<<6, 5<<6 unused)
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#define AF_FORMAT_S_MPEG2 (3<<6) // MPEG(2) audio
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#define AF_FORMAT_S_AC3 (4<<6) // Dolby Digital AC3
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#define AF_FORMAT_S_IEC61937 (6<<6)
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#define AF_FORMAT_SPECIAL_MASK (7<<6)
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// Fixed or floating point
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#define AF_FORMAT_I (1<<9) // Int
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#define AF_FORMAT_F (2<<9) // Foating point
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#define AF_FORMAT_POINT_MASK (3<<9)
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// Interleaving (planar formats have data for each channel in separate planes)
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#define AF_FORMAT_INTERLEAVED (0<<11) // must be 0
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#define AF_FORMAT_PLANAR (1<<11)
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#define AF_FORMAT_INTERLEAVING_MASK (1<<11)
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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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// 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_US|AF_FORMAT_8BIT|AF_FORMAT_NE),
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AF_FORMAT_S8 = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_8BIT|AF_FORMAT_NE),
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AF_FORMAT_U16_LE = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_16BIT|AF_FORMAT_LE),
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AF_FORMAT_U16_BE = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_16BIT|AF_FORMAT_BE),
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AF_FORMAT_S16_LE = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_16BIT|AF_FORMAT_LE),
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AF_FORMAT_S16_BE = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_16BIT|AF_FORMAT_BE),
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AF_FORMAT_U24_LE = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_24BIT|AF_FORMAT_LE),
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AF_FORMAT_U24_BE = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_24BIT|AF_FORMAT_BE),
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AF_FORMAT_S24_LE = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_24BIT|AF_FORMAT_LE),
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AF_FORMAT_S24_BE = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_24BIT|AF_FORMAT_BE),
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AF_FORMAT_U32_LE = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_32BIT|AF_FORMAT_LE),
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AF_FORMAT_U32_BE = (AF_FORMAT_I|AF_FORMAT_US|AF_FORMAT_32BIT|AF_FORMAT_BE),
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AF_FORMAT_S32_LE = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_32BIT|AF_FORMAT_LE),
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AF_FORMAT_S32_BE = (AF_FORMAT_I|AF_FORMAT_SI|AF_FORMAT_32BIT|AF_FORMAT_BE),
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AF_FORMAT_FLOAT_LE = (AF_FORMAT_F|AF_FORMAT_32BIT|AF_FORMAT_LE),
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AF_FORMAT_FLOAT_BE = (AF_FORMAT_F|AF_FORMAT_32BIT|AF_FORMAT_BE),
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AF_FORMAT_DOUBLE_LE = (AF_FORMAT_F|AF_FORMAT_64BIT|AF_FORMAT_LE),
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AF_FORMAT_DOUBLE_BE = (AF_FORMAT_F|AF_FORMAT_64BIT|AF_FORMAT_BE),
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AF_FORMAT_AC3_LE = (AF_FORMAT_S_AC3|AF_FORMAT_16BIT|AF_FORMAT_LE),
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AF_FORMAT_AC3_BE = (AF_FORMAT_S_AC3|AF_FORMAT_16BIT|AF_FORMAT_BE),
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AF_FORMAT_IEC61937_LE = (AF_FORMAT_S_IEC61937|AF_FORMAT_16BIT|AF_FORMAT_LE),
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AF_FORMAT_IEC61937_BE = (AF_FORMAT_S_IEC61937|AF_FORMAT_16BIT|AF_FORMAT_BE),
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AF_FORMAT_MPEG2 = (AF_FORMAT_S_MPEG2),
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// Planar variants
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AF_FORMAT_U8P = (AF_INTP|AF_FORMAT_US|AF_FORMAT_8BIT|AF_FORMAT_NE),
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AF_FORMAT_S16P = (AF_INTP|AF_FORMAT_SI|AF_FORMAT_16BIT|AF_FORMAT_NE),
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AF_FORMAT_S32P = (AF_INTP|AF_FORMAT_US|AF_FORMAT_32BIT|AF_FORMAT_NE),
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AF_FORMAT_FLOATP = (AF_FLTP|AF_FORMAT_32BIT|AF_FORMAT_NE),
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AF_FORMAT_DOUBLEP = (AF_FLTP|AF_FORMAT_64BIT|AF_FORMAT_NE),
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// Native endian variants
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AF_FORMAT_U16 = AF_SELECT_LE_BE(AF_FORMAT_U16_LE, AF_FORMAT_U16_BE),
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AF_FORMAT_S16 = AF_SELECT_LE_BE(AF_FORMAT_S16_LE, AF_FORMAT_S16_BE),
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AF_FORMAT_U24 = AF_SELECT_LE_BE(AF_FORMAT_U24_LE, AF_FORMAT_U24_BE),
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AF_FORMAT_S24 = AF_SELECT_LE_BE(AF_FORMAT_S24_LE, AF_FORMAT_S24_BE),
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AF_FORMAT_U32 = AF_SELECT_LE_BE(AF_FORMAT_U32_LE, AF_FORMAT_U32_BE),
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AF_FORMAT_S32 = AF_SELECT_LE_BE(AF_FORMAT_S32_LE, AF_FORMAT_S32_BE),
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AF_FORMAT_FLOAT = AF_SELECT_LE_BE(AF_FORMAT_FLOAT_LE, AF_FORMAT_FLOAT_BE),
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AF_FORMAT_DOUBLE = AF_SELECT_LE_BE(AF_FORMAT_DOUBLE_LE, AF_FORMAT_DOUBLE_BE),
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AF_FORMAT_AC3 = AF_SELECT_LE_BE(AF_FORMAT_AC3_LE, AF_FORMAT_AC3_BE),
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AF_FORMAT_IEC61937 = AF_SELECT_LE_BE(AF_FORMAT_IEC61937_LE, AF_FORMAT_IEC61937_BE),
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};
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#define AF_FORMAT_IS_AC3(fmt) \
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(((fmt) & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_S_AC3)
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#define AF_FORMAT_IS_IEC61937(fmt) \
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(AF_FORMAT_IS_AC3(fmt) || \
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((fmt) & AF_FORMAT_SPECIAL_MASK) == AF_FORMAT_S_IEC61937)
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#define AF_FORMAT_IS_SPECIAL(fmt) \
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((fmt & AF_FORMAT_SPECIAL_MASK) != 0)
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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_fmt2bits(int format);
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int af_fmt_change_bits(int format, int bits);
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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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bool af_fmt_is_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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#endif /* MPLAYER_AF_FORMAT_H */
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