mirror of
https://github.com/mpv-player/mpv
synced 2024-12-25 08:12:17 +00:00
57048c7393
This provides a new method for enabling spdif passthrough. The old method via --ad (--ad=spdif:ac3 etc.) is deprecated. The deprecated method will probably stop working at some point. This also supports PCM fallback. One caveat is that it will lose at least 1 audio packet in doing so. (I don't care enough to prevent this.) (This is named after the old S/PDIF connector, because it uses the same underlying technology as far as the higher level protoco is concerned. Also, the user should be renamed that passthrough is backwards.)
169 lines
6.4 KiB
C
169 lines
6.4 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 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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* 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 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 mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include "talloc.h"
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#include "misc/bstr.h"
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#include "common/msg.h"
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#include "codecs.h"
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void mp_add_decoder(struct mp_decoder_list *list, const char *family,
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const char *codec, const char *decoder, const char *desc)
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{
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struct mp_decoder_entry entry = {
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.family = talloc_strdup(list, family),
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.codec = talloc_strdup(list, codec),
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.decoder = talloc_strdup(list, decoder),
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.desc = talloc_strdup(list, desc),
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};
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MP_TARRAY_APPEND(list, list->entries, list->num_entries, entry);
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}
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static void mp_add_decoder_entry(struct mp_decoder_list *list,
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struct mp_decoder_entry *entry)
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{
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mp_add_decoder(list, entry->family, entry->codec, entry->decoder,
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entry->desc);
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}
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static struct mp_decoder_entry *find_decoder(struct mp_decoder_list *list,
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bstr family, bstr decoder)
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{
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for (int n = 0; n < list->num_entries; n++) {
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struct mp_decoder_entry *cur = &list->entries[n];
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if (bstr_equals0(decoder, cur->decoder) &&
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bstr_equals0(family, cur->family))
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return cur;
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}
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return NULL;
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}
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// Add entry, but only if it's not yet on the list, and if the codec matches.
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// If codec == NULL, don't compare codecs.
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static void add_new(struct mp_decoder_list *to, struct mp_decoder_entry *entry,
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const char *codec)
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{
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if (!entry || (codec && strcmp(entry->codec, codec) != 0))
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return;
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if (!find_decoder(to, bstr0(entry->family), bstr0(entry->decoder)))
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mp_add_decoder_entry(to, entry);
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}
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// Select a decoder from the given list for the given codec. The selection
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// can be influenced by the selection string, which can specify a priority
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// list of preferred decoders.
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// This returns a list of decoders to try, with the preferred decoders first.
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// The selection string corresponds to --vd/--ad directly, and has the
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// following syntax:
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// selection = [<entry> ("," <entry>)*]
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// entry = <family> ":" <decoder> // prefer decoder
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// entry = <family> ":*" // prefer all decoders
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// entry = "+" <family> ":" <decoder> // force a decoder
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// entry = "-" <family> ":" <decoder> // exclude a decoder
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// entry = "-" // don't add fallback decoders
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// Forcing a decoder means it's added even if the codec mismatches.
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struct mp_decoder_list *mp_select_decoders(struct mp_decoder_list *all,
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const char *codec,
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const char *selection)
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{
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struct mp_decoder_list *list = talloc_zero(NULL, struct mp_decoder_list);
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struct mp_decoder_list *remove = talloc_zero(NULL, struct mp_decoder_list);
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if (!codec)
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codec = "unknown";
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bool stop = false;
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bstr sel = bstr0(selection);
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while (sel.len) {
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bstr entry;
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bstr_split_tok(sel, ",", &entry, &sel);
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if (bstr_equals0(entry, "-")) {
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stop = true;
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break;
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}
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bool force = bstr_eatstart0(&entry, "+");
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bool exclude = !force && bstr_eatstart0(&entry, "-");
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struct mp_decoder_list *dest = exclude ? remove : list;
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bstr family, decoder;
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if (!bstr_split_tok(entry, ":", &family, &decoder)) {
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family = entry;
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decoder = bstr0("*");
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}
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if (bstr_equals0(decoder, "*")) {
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for (int n = 0; n < all->num_entries; n++) {
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struct mp_decoder_entry *cur = &all->entries[n];
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if (bstr_equals0(family, cur->family))
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add_new(dest, cur, codec);
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}
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} else {
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add_new(dest, find_decoder(all, family, decoder),
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force ? NULL : codec);
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}
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}
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if (!stop) {
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// Add the remaining codecs which haven't been added yet
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for (int n = 0; n < all->num_entries; n++)
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add_new(list, &all->entries[n], codec);
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}
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for (int n = 0; n < remove->num_entries; n++) {
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struct mp_decoder_entry *ex = &remove->entries[n];
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struct mp_decoder_entry *del =
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find_decoder(list, bstr0(ex->family), bstr0(ex->decoder));
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if (del) {
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int index = del - &list->entries[0];
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MP_TARRAY_REMOVE_AT(list->entries, list->num_entries, index);
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}
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}
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talloc_free(remove);
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return list;
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}
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// selection is a ","-separated list of decoders, all in the given family.
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struct mp_decoder_list *mp_select_decoder_list(struct mp_decoder_list *all,
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const char *codec,
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const char *family,
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const char *selection)
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{
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struct mp_decoder_list *list = talloc_zero(NULL, struct mp_decoder_list);
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bstr sel = bstr0(selection);
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while (sel.len) {
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bstr decoder;
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bstr_split_tok(sel, ",", &decoder, &sel);
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add_new(list, find_decoder(all, bstr0(family), decoder), codec);
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}
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return list;
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}
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void mp_append_decoders(struct mp_decoder_list *list, struct mp_decoder_list *a)
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{
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for (int n = 0; n < a->num_entries; n++)
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add_new(list, &a->entries[n], NULL);
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}
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void mp_print_decoders(struct mp_log *log, int msgl, const char *header,
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struct mp_decoder_list *list)
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{
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mp_msg(log, msgl, "%s\n", header);
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for (int n = 0; n < list->num_entries; n++) {
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struct mp_decoder_entry *entry = &list->entries[n];
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mp_msg(log, msgl, " %s:%s", entry->family, entry->decoder);
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if (strcmp(entry->decoder, entry->codec) != 0)
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mp_msg(log, msgl, " (%s)", entry->codec);
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mp_msg(log, msgl, " - %s\n", entry->desc);
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}
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if (list->num_entries == 0)
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mp_msg(log, msgl, " (no decoders)\n");
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}
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