mirror of
https://github.com/mpv-player/mpv
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03596ac551
This is the last sample format that was only in mpv and not in FFmpeg (except the spdif special formats). It was a huge pain, even if the removed code in af_lavrresample is pretty small after all. Note that this drops S24 from the ao_coreaudio AOs too. I'm not sure about the impact, but I expect it doesn't matter. af_fmt_change_bytes() was unused as well, so remove that too.
273 lines
8.9 KiB
C
273 lines
8.9 KiB
C
/*
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* Copyright (C) 2005 Alex Beregszaszi
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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
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <limits.h>
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#include "common/common.h"
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#include "audio/filter/af.h"
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// number of bytes per sample, 0 if invalid/unknown
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int af_fmt_to_bytes(int format)
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{
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switch (af_fmt_from_planar(format)) {
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case AF_FORMAT_U8: return 1;
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case AF_FORMAT_S16: return 2;
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case AF_FORMAT_S32: return 4;
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case AF_FORMAT_FLOAT: return 4;
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case AF_FORMAT_DOUBLE: return 8;
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}
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if (af_fmt_is_spdif(format))
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return 2;
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return 0;
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}
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// All formats are considered signed, except explicitly unsigned int formats.
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bool af_fmt_is_unsigned(int format)
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{
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return format == AF_FORMAT_U8 || format == AF_FORMAT_U8P;
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}
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bool af_fmt_is_float(int format)
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{
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format = af_fmt_from_planar(format);
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return format == AF_FORMAT_FLOAT || format == AF_FORMAT_DOUBLE;
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}
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// true for both unsigned and signed ints
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bool af_fmt_is_int(int format)
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{
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return format && !af_fmt_is_spdif(format) && !af_fmt_is_float(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_fmt_to_planar(format) == format;
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}
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bool af_fmt_is_spdif(int format)
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{
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return af_format_sample_alignment(format) > 1;
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}
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bool af_fmt_is_pcm(int format)
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{
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return af_fmt_is_valid(format) && !af_fmt_is_spdif(format);
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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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bool af_fmt_is_valid(int format)
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{
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return format > 0 && format < AF_FORMAT_COUNT;
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}
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const char *af_fmt_to_str(int format)
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{
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switch (format) {
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case AF_FORMAT_U8: return "u8";
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case AF_FORMAT_S16: return "s16";
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case AF_FORMAT_S32: return "s32";
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case AF_FORMAT_FLOAT: return "float";
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case AF_FORMAT_DOUBLE: return "double";
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case AF_FORMAT_U8P: return "u8p";
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case AF_FORMAT_S16P: return "s16p";
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case AF_FORMAT_S32P: return "s32p";
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case AF_FORMAT_FLOATP: return "floatp";
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case AF_FORMAT_DOUBLEP: return "doublep";
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case AF_FORMAT_S_AAC: return "spdif-aac";
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case AF_FORMAT_S_AC3: return "spdif-ac3";
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case AF_FORMAT_S_DTS: return "spdif-dts";
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case AF_FORMAT_S_DTSHD: return "spdif-dtshd";
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case AF_FORMAT_S_EAC3: return "spdif-eac3";
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case AF_FORMAT_S_MP3: return "spdif-mp3";
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case AF_FORMAT_S_TRUEHD: return "spdif-truehd";
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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_fmt_to_bytes(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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void af_fill_silence(void *dst, size_t bytes, int format)
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{
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memset(dst, af_fmt_is_unsigned(format) ? 0x80 : 0, bytes);
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}
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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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static 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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// Can't be normally converted
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if (!af_fmt_is_pcm(dst_format) || !af_fmt_is_pcm(src_format))
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return INT_MIN;
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int score = 1024;
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if (af_fmt_is_planar(dst_format) != af_fmt_is_planar(src_format))
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score -= 1; // has to (de-)planarize
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if (af_fmt_is_float(dst_format) != af_fmt_is_float(src_format)) {
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int dst_bytes = af_fmt_to_bytes(dst_format);
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if (af_fmt_is_float(dst_format)) {
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// For int->float, consider a lower bound on the precision difference.
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int bytes = (dst_bytes == 4 ? 3 : 6) - af_fmt_to_bytes(src_format);
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if (bytes >= 0) {
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score -= 8 * bytes; // excess precision
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} else {
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score += 1024 * (bytes - 1); // precision is lost (i.e. s32 -> float)
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}
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} else {
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// float->int is the worst case. Penalize heavily and
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// prefer highest bit depth int.
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score -= 1048576 * (8 - dst_bytes);
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}
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score -= 512; // penalty for any float <-> int conversion
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} else {
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int bytes = af_fmt_to_bytes(dst_format) - af_fmt_to_bytes(src_format);
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if (bytes > 0) {
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score -= 8 * bytes; // has to add padding
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} else if (bytes < 0) {
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score += 1024 * (bytes - 1); // has to reduce bit depth
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}
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}
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return score;
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}
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struct entry {
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int fmt;
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int score;
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};
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static int cmp_entry(const void *a, const void *b)
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{
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#define CMP_INT(a, b) (a > b ? 1 : (a < b ? -1 : 0))
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return -CMP_INT(((struct entry *)a)->score, ((struct entry *)b)->score);
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}
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// Return a list of sample format compatible to src_format, sorted by order
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// of preference. out_formats[0] will be src_format (as long as it's valid),
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// and the list is terminated with 0 (AF_FORMAT_UNKNOWN).
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// Keep in mind that this also returns formats with flipped interleaving
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// (e.g. for s16, it returns [s16, s16p, ...]).
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void af_get_best_sample_formats(int src_format, int out_formats[AF_FORMAT_COUNT])
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{
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int num = 0;
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struct entry e[AF_FORMAT_COUNT];
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for (int fmt = 1; fmt < AF_FORMAT_COUNT; fmt++) {
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int score = af_format_conversion_score(fmt, src_format);
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if (score > INT_MIN)
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e[num++] = (struct entry){fmt, score};
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}
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qsort(e, num, sizeof(e[0]), cmp_entry);
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for (int n = 0; n < num; n++)
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out_formats[n] = e[n].fmt;
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out_formats[num] = 0;
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}
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// Return the best match to src_samplerate from the list provided in the array
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// *available, which must be terminated by 0, or itself NULL. If *available is
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// empty or NULL, return a negative value. Exact match to src_samplerate is
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// most preferred, followed by the lowest integer multiple, followed by the
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// maximum of *available.
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int af_select_best_samplerate(int src_samplerate, const int *available)
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{
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if (!available)
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return -1;
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int min_mult_rate = INT_MAX;
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int max_rate = INT_MIN;
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for (int i = 0; available[i]; i++) {
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if (available[i] == src_samplerate)
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return available[i];
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if (!(available[i] % src_samplerate))
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min_mult_rate = MPMIN(min_mult_rate, available[i]);
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max_rate = MPMAX(max_rate, available[i]);
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}
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if (min_mult_rate < INT_MAX)
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return min_mult_rate;
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if (max_rate > INT_MIN)
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return max_rate;
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return -1;
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}
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// Return the number of samples that make up one frame in this format.
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// You get the byte size by multiplying them with sample size and channel count.
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int af_format_sample_alignment(int format)
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{
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switch (format) {
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case AF_FORMAT_S_AAC: return 16384 / 4;
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case AF_FORMAT_S_AC3: return 6144 / 4;
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case AF_FORMAT_S_DTSHD: return 32768 / 16;
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case AF_FORMAT_S_DTS: return 2048 / 4;
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case AF_FORMAT_S_EAC3: return 24576 / 4;
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case AF_FORMAT_S_MP3: return 4608 / 4;
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case AF_FORMAT_S_TRUEHD: return 61440 / 16;
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default: return 1;
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}
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}
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