mirror of
https://github.com/mpv-player/mpv
synced 2024-12-18 12:55:16 +00:00
bff03a181f
Currently every single AO was implementing it's own ringbuffer, many times with slightly different semantics. This is an attempt to fix the problem. I stole some good ideas from ao_portaudio's ringbuffer and went from there. The main difference is this one stores wpos and rpos which are absolute positions in an "infinite" buffer. To find the actual position for writing / reading just apply modulo size. The producer only modifies wpos while the consumer only modifies rpos. This makes it pretty easy to reason about and make the operations thread safe by using barriers (thread safety is guaranteed only in the Single-Producer/Single- Consumer case). Also adapted ao_coreaudio to use this ringbuffer.
138 lines
3.8 KiB
C
138 lines
3.8 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 "audio/filter/af.h"
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int af_fmt2bits(int format)
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{
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if (AF_FORMAT_IS_AC3(format)) return 16;
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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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{
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case AF_FORMAT_8BIT: return 8;
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case AF_FORMAT_16BIT: return 16;
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case AF_FORMAT_24BIT: return 24;
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case AF_FORMAT_32BIT: return 32;
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case AF_FORMAT_64BIT: return 64;
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}
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return 0;
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}
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/* Convert format to str input str is a buffer for the
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converted string, size is the size of the buffer */
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char* af_fmt2str(int format, char* str, int size)
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{
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const char *name = af_fmt2str_short(format);
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if (name) {
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snprintf(str, size, "%s", name);
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} else {
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snprintf(str, size, "%#x", format);
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}
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return str;
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}
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const struct af_fmt_entry af_fmtstr_table[] = {
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{ "mpeg2", AF_FORMAT_MPEG2 },
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{ "ac3le", AF_FORMAT_AC3_LE },
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{ "ac3be", AF_FORMAT_AC3_BE },
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{ "ac3ne", AF_FORMAT_AC3_NE },
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{ "iec61937le", AF_FORMAT_IEC61937_LE },
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{ "iec61937be", AF_FORMAT_IEC61937_BE },
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{ "iec61937ne", AF_FORMAT_IEC61937_NE },
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{ "u8", AF_FORMAT_U8 },
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{ "s8", AF_FORMAT_S8 },
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{ "u16le", AF_FORMAT_U16_LE },
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{ "u16be", AF_FORMAT_U16_BE },
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{ "u16ne", AF_FORMAT_U16_NE },
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{ "s16le", AF_FORMAT_S16_LE },
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{ "s16be", AF_FORMAT_S16_BE },
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{ "s16ne", AF_FORMAT_S16_NE },
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{ "u24le", AF_FORMAT_U24_LE },
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{ "u24be", AF_FORMAT_U24_BE },
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{ "u24ne", AF_FORMAT_U24_NE },
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{ "s24le", AF_FORMAT_S24_LE },
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{ "s24be", AF_FORMAT_S24_BE },
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{ "s24ne", AF_FORMAT_S24_NE },
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{ "u32le", AF_FORMAT_U32_LE },
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{ "u32be", AF_FORMAT_U32_BE },
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{ "u32ne", AF_FORMAT_U32_NE },
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{ "s32le", AF_FORMAT_S32_LE },
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{ "s32be", AF_FORMAT_S32_BE },
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{ "s32ne", AF_FORMAT_S32_NE },
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{ "floatle", AF_FORMAT_FLOAT_LE },
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{ "floatbe", AF_FORMAT_FLOAT_BE },
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{ "floatne", AF_FORMAT_FLOAT_NE },
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{ "doublele", AF_FORMAT_DOUBLE_LE },
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{ "doublebe", AF_FORMAT_DOUBLE_BE },
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{ "doublene", AF_FORMAT_DOUBLE_NE },
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{0}
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};
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const char *af_fmt2str_short(int format)
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{
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int i;
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for (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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return "??";
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}
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static bool af_fmt_valid(int format)
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{
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return (format & AF_FORMAT_MASK) == format;
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}
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int af_fmt_seconds_to_bytes(int format, float seconds, int channels)
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{
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int bps = (af_fmt2bits(format) / 8);
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int framelen = channels * bps;
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int bytes = seconds * bps;
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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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if (bstr_startswith0(str, "0x")) {
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bstr rest;
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int fmt = bstrtoll(str, &rest, 16);
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if (rest.len == 0 && af_fmt_valid(fmt))
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return fmt;
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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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return -1;
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}
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