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https://github.com/mpv-player/mpv
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31a10f7c38
In most places where af_fmt2bits is called to get the bits/sample, the result is immediately converted to bytes/sample. Avoid this by getting bytes/sample directly by introducing af_fmt2bps.
237 lines
7.5 KiB
C
237 lines
7.5 KiB
C
/*
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* Copyright (C) 2005 Alex Beregszaszi
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <assert.h>
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#include "common/common.h"
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#include "audio/filter/af.h"
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int af_fmt2bps(int format)
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{
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if (AF_FORMAT_IS_AC3(format)) return 2;
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if (format == AF_FORMAT_UNKNOWN)
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return 0;
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switch (format & AF_FORMAT_BITS_MASK) {
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case AF_FORMAT_8BIT: return 1;
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case AF_FORMAT_16BIT: return 2;
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case AF_FORMAT_24BIT: return 3;
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case AF_FORMAT_32BIT: return 4;
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case AF_FORMAT_64BIT: return 8;
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}
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return 0;
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}
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int af_fmt2bits(int format)
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{
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return af_fmt2bps(format) * 8;
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}
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static int bits_to_mask(int bits)
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{
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switch (bits) {
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case 8: return AF_FORMAT_8BIT;
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case 16: return AF_FORMAT_16BIT;
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case 24: return AF_FORMAT_24BIT;
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case 32: return AF_FORMAT_32BIT;
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case 64: return AF_FORMAT_64BIT;
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}
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return 0;
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}
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int af_fmt_change_bits(int format, int bits)
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{
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if (!af_fmt_is_valid(format) || (format & AF_FORMAT_SPECIAL_MASK))
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return 0;
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int mask = bits_to_mask(bits);
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format = (format & ~AF_FORMAT_BITS_MASK) | mask;
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return af_fmt_is_valid(format) ? format : 0;
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}
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static const int planar_formats[][2] = {
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{AF_FORMAT_U8P, AF_FORMAT_U8},
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{AF_FORMAT_S16P, AF_FORMAT_S16},
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{AF_FORMAT_S32P, AF_FORMAT_S32},
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{AF_FORMAT_FLOATP, AF_FORMAT_FLOAT},
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{AF_FORMAT_DOUBLEP, AF_FORMAT_DOUBLE},
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};
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// Return the planar format corresponding to the given format.
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// If the format is already planar, return it.
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// Return 0 if there's no equivalent.
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int af_fmt_to_planar(int format)
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{
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for (int n = 0; n < MP_ARRAY_SIZE(planar_formats); n++) {
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if (planar_formats[n][1] == format)
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return planar_formats[n][0];
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if (planar_formats[n][0] == format)
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return format;
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}
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return 0;
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}
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// Return the interleaved format corresponding to the given format.
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// If the format is already interleaved, return it.
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// Always succeeds if format is actually planar; otherwise return 0.
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int af_fmt_from_planar(int format)
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{
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for (int n = 0; n < MP_ARRAY_SIZE(planar_formats); n++) {
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if (planar_formats[n][0] == format)
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return planar_formats[n][1];
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}
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return format;
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}
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// false for interleaved and AF_FORMAT_UNKNOWN
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bool af_fmt_is_planar(int format)
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{
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return !!(format & AF_FORMAT_PLANAR);
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}
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#define FMT(string, id) \
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{string, id},
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#define FMT_ENDIAN(string, id) \
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{string, id}, \
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{string "le", MP_CONCAT(id, _LE)}, \
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{string "be", MP_CONCAT(id, _BE)}, \
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const struct af_fmt_entry af_fmtstr_table[] = {
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FMT("mpeg2", AF_FORMAT_MPEG2)
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FMT_ENDIAN("ac3", AF_FORMAT_AC3)
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FMT_ENDIAN("iec61937", AF_FORMAT_IEC61937)
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FMT("u8", AF_FORMAT_U8)
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FMT("s8", AF_FORMAT_S8)
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FMT_ENDIAN("u16", AF_FORMAT_U16)
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FMT_ENDIAN("s16", AF_FORMAT_S16)
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FMT_ENDIAN("u24", AF_FORMAT_U24)
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FMT_ENDIAN("s24", AF_FORMAT_S24)
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FMT_ENDIAN("u32", AF_FORMAT_U32)
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FMT_ENDIAN("s32", AF_FORMAT_S32)
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FMT_ENDIAN("float", AF_FORMAT_FLOAT)
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FMT_ENDIAN("double", AF_FORMAT_DOUBLE)
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FMT("u8p", AF_FORMAT_U8P)
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FMT("s16p", AF_FORMAT_S16P)
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FMT("s32p", AF_FORMAT_S32P)
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FMT("floatp", AF_FORMAT_FLOATP)
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FMT("doublep", AF_FORMAT_DOUBLEP)
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{0}
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};
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bool af_fmt_is_valid(int format)
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{
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for (int i = 0; af_fmtstr_table[i].name; i++) {
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if (af_fmtstr_table[i].format == format)
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return true;
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}
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return false;
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}
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const char *af_fmt_to_str(int format)
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{
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for (int i = 0; af_fmtstr_table[i].name; i++) {
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if (af_fmtstr_table[i].format == format)
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return af_fmtstr_table[i].name;
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}
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return "??";
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}
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int af_fmt_seconds_to_bytes(int format, float seconds, int channels, int samplerate)
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{
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assert(!af_fmt_is_planar(format));
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int bps = af_fmt2bps(format);
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int framelen = channels * bps;
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int bytes = seconds * bps * samplerate;
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if (bytes % framelen)
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bytes += framelen - (bytes % framelen);
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return bytes;
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}
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int af_str2fmt_short(bstr str)
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{
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for (int i = 0; af_fmtstr_table[i].name; i++) {
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if (!bstrcasecmp0(str, af_fmtstr_table[i].name))
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return af_fmtstr_table[i].format;
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}
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return 0;
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}
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void af_fill_silence(void *dst, size_t bytes, int format)
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{
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bool us = (format & AF_FORMAT_SIGN_MASK) == AF_FORMAT_US;
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memset(dst, us ? 0x80 : 0, bytes);
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}
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#define FMT_DIFF(type, a, b) (((a) & type) - ((b) & type))
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// Returns a "score" that serves as heuristic how lossy or hard a conversion is.
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// If the formats are equal, 1024 is returned. If they are gravely incompatible
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// (like s16<->ac3), INT_MIN is returned. If there is implied loss of precision
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// (like s16->s8), a value <0 is returned.
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int af_format_conversion_score(int dst_format, int src_format)
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{
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if (dst_format == AF_FORMAT_UNKNOWN || src_format == AF_FORMAT_UNKNOWN)
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return INT_MIN;
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if (dst_format == src_format)
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return 1024;
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// Just endian swapping (separate because it works for special formats)
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if ((dst_format & ~AF_FORMAT_END_MASK) == (src_format & ~AF_FORMAT_END_MASK))
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return 1024 - 2;
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// Can't be normally converted
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if (AF_FORMAT_IS_SPECIAL(dst_format) || AF_FORMAT_IS_SPECIAL(src_format))
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return INT_MIN;
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int score = 1024;
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if (FMT_DIFF(AF_FORMAT_INTERLEAVING_MASK, dst_format, src_format))
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score -= 1; // has to (de-)planarize
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if (FMT_DIFF(AF_FORMAT_END_MASK, dst_format, src_format))
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score -= 2; // has to swap endian
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if (FMT_DIFF(AF_FORMAT_SIGN_MASK, dst_format, src_format))
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score -= 4; // has to swap sign
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if (FMT_DIFF(AF_FORMAT_POINT_MASK, dst_format, src_format)) {
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int dst_bits = dst_format & AF_FORMAT_BITS_MASK;
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if ((dst_format & AF_FORMAT_POINT_MASK) == AF_FORMAT_F) {
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// For int->float, always prefer 32 bit float.
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score -= dst_bits == AF_FORMAT_32BIT ? 8 : 0;
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} else {
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// For float->int, always prefer highest bit depth int
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score -= 8 * (AF_FORMAT_64BIT - dst_bits);
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}
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} else {
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int bits = FMT_DIFF(AF_FORMAT_BITS_MASK, dst_format, src_format);
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if (bits > 0) {
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score -= 8 * bits; // has to add padding
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} else if (bits < 0) {
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score -= 1024 - 8 * bits; // has to reduce bit depth
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}
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}
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// Consider this the worst case.
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if (FMT_DIFF(AF_FORMAT_POINT_MASK, dst_format, src_format))
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score -= 2048; // has to convert float<->int
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return score;
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}
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