mirror of
https://github.com/mpv-player/mpv
synced 2024-11-14 22:48:35 +01:00
8a9b64329c
This covers source files which were added in mplayer2 and mpv times
only, and where all code is covered by LGPL relicensing agreements.
There are probably more files to which this applies, but I'm being
conservative here.
A file named ao_sdl.c exists in MPlayer too, but the mpv one is a
complete rewrite, and was added some time after the original ao_sdl.c
was removed. The same applies to vo_sdl.c, for which the SDL2 API is
radically different in addition (MPlayer supports SDL 1.2 only).
common.c contains only code written by me. But common.h is a strange
case: although it originally was named mp_common.h and exists in MPlayer
too, by now it contains only definitions written by uau and me. The
exceptions are the CONTROL_ defines - thus not changing the license of
common.h yet.
codec_tags.c contained once large tables generated from MPlayer's
codecs.conf, but all of these tables were removed.
From demux_playlist.c I'm removing a code fragment from someone who was
not asked; this probably could be done later (see commit 15dccc37
).
misc.c is a bit complicated to reason about (it was split off mplayer.c
and thus contains random functions out of this file), but actually all
functions have been added post-MPlayer. Except get_relative_time(),
which was written by uau, but looks similar to 3 different versions of
something similar in each of the Unix/win32/OSX timer source files. I'm
not sure what that means in regards to copyright, so I've just moved it
into another still-GPL source file for now.
screenshot.c once had some minor parts of MPlayer's vf_screenshot.c, but
they're all gone.
159 lines
4.5 KiB
C
159 lines
4.5 KiB
C
/*
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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 <stdio.h>
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#include <stdint.h>
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#include "osdep/io.h"
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#include "common/common.h"
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#include "common/msg.h"
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#include "options/options.h"
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#include "stream.h"
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#define BLOCK_SIZE 1024LL
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#define BLOCK_ALIGN(p) ((p) & ~(BLOCK_SIZE - 1))
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struct priv {
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struct stream *original;
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FILE *cache_file;
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uint8_t *block_bits; // 1 bit for each BLOCK_SIZE, whether block was read
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int64_t size; // currently known size
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int64_t max_size; // max. size for block_bits and cache_file
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};
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static bool test_bit(struct priv *p, int64_t pos)
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{
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if (pos < 0 || pos >= p->size)
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return false;
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size_t block = pos / BLOCK_SIZE;
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return p->block_bits[block / 8] & (1 << (block % 8));
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}
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static void set_bit(struct priv *p, int64_t pos, bool bit)
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{
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if (pos < 0 || pos >= p->size)
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return;
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size_t block = pos / BLOCK_SIZE;
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unsigned int m = (1 << (block % 8));
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p->block_bits[block / 8] = (p->block_bits[block / 8] & ~m) | (bit ? m : 0);
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}
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static int fill_buffer(stream_t *s, char *buffer, int max_len)
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{
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struct priv *p = s->priv;
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if (s->pos < 0)
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return -1;
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if (s->pos >= p->max_size) {
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if (stream_seek(p->original, s->pos) < 1)
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return -1;
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return stream_read(p->original, buffer, max_len);
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}
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// Size of file changes -> invalidate last block
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if (s->pos >= p->size - BLOCK_SIZE) {
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int64_t new_size = stream_get_size(s);
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if (p->size >= 0 && new_size != p->size)
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set_bit(p, BLOCK_ALIGN(p->size), 0);
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p->size = MPMIN(p->max_size, new_size);
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}
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int64_t aligned = BLOCK_ALIGN(s->pos);
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if (!test_bit(p, aligned)) {
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char tmp[BLOCK_SIZE];
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stream_seek(p->original, aligned);
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int r = stream_read(p->original, tmp, BLOCK_SIZE);
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if (r < BLOCK_SIZE) {
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if (p->size < 0) {
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MP_WARN(s, "suspected EOF\n");
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} else if (aligned + r < p->size) {
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MP_ERR(s, "unexpected EOF\n");
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return -1;
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}
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}
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if (fseeko(p->cache_file, aligned, SEEK_SET))
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return -1;
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if (fwrite(tmp, r, 1, p->cache_file) != 1)
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return -1;
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set_bit(p, aligned, 1);
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}
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if (fseeko(p->cache_file, s->pos, SEEK_SET))
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return -1;
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// align/limit to blocks
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max_len = MPMIN(max_len, BLOCK_SIZE - (s->pos % BLOCK_SIZE));
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// Limit to max. known file size
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if (p->size >= 0)
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max_len = MPMIN(max_len, p->size - s->pos);
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return fread(buffer, 1, max_len, p->cache_file);
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}
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static int seek(stream_t *s, int64_t newpos)
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{
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return 1;
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}
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static int control(stream_t *s, int cmd, void *arg)
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{
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struct priv *p = s->priv;
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return stream_control(p->original, cmd, arg);
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}
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static void s_close(stream_t *s)
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{
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struct priv *p = s->priv;
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if (p->cache_file)
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fclose(p->cache_file);
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talloc_free(p);
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}
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// return 1 on success, 0 if disabled, -1 on error
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int stream_file_cache_init(stream_t *cache, stream_t *stream,
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struct mp_cache_opts *opts)
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{
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if (!opts->file || !opts->file[0] || opts->file_max < 1)
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return 0;
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if (!stream->seekable) {
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MP_ERR(cache, "can't cache unseekable stream\n");
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return -1;
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}
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bool use_anon_file = strcmp(opts->file, "TMP") == 0;
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FILE *file = use_anon_file ? tmpfile() : fopen(opts->file, "wb+");
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if (!file) {
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MP_ERR(cache, "can't open cache file '%s'\n", opts->file);
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return -1;
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}
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struct priv *p = talloc_zero(NULL, struct priv);
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cache->priv = p;
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p->original = stream;
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p->cache_file = file;
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p->max_size = opts->file_max * 1024LL;
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// file_max can be INT_MAX, so this is at most about 256MB
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p->block_bits = talloc_zero_size(p, (p->max_size / BLOCK_SIZE + 1) / 8 + 1);
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cache->seek = seek;
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cache->fill_buffer = fill_buffer;
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cache->control = control;
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cache->close = s_close;
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return 1;
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}
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