mpv/core/codecs.c

148 lines
5.7 KiB
C
Raw Normal View History

core: redo how codecs are mapped, remove codecs.conf Use codec names instead of FourCCs to identify codecs. Rewrite how codecs are selected and initialized. Now each decoder exports a list of decoders (and the codec it supports) via add_decoders(). The order matters, and the first decoder for a given decoder is preferred over the other decoders. E.g. all ad_mpg123 decoders are preferred over ad_lavc, because it comes first in the mpcodecs_ad_drivers array. Likewise, decoders within ad_lavc that are enumerated first by libavcodec (using av_codec_next()) are preferred. (This is actually critical to select h264 software decoding by default instead of vdpau. libavcodec and ffmpeg/avconv use the same method to select decoders by default, so we hope this is sane.) The codec names follow libavcodec's codec names as defined by AVCodecDescriptor.name (see libavcodec/codec_desc.c). Some decoders have names different from the canonical codec name. The AVCodecDescriptor API is relatively new, so we need a compatibility layer for older libavcodec versions for codec names that are referenced internally, and which are different from the decoder name. (Add a configure check for that, because checking versions is getting way too messy.) demux/codec_tags.c is generated from the former codecs.conf (minus "special" decoders like vdpau, and excluding the mappings that are the same as the mappings libavformat's exported RIFF tables). It contains all the mappings from FourCCs to codec name. This is needed for demux_mkv, demux_mpg, demux_avi and demux_asf. demux_lavf will set the codec as determined by libavformat, while the other demuxers have to do this on their own, using the mp_set_audio/video_codec_from_tag() functions. Note that the sh_audio/video->format members don't uniquely identify the codec anymore, and sh->codec takes over this role. Replace the --ac/--vc/--afm/--vfm with new --vd/--ad options, which provide cover the functionality of the removed switched. Note: there's no CODECS_FLAG_FLIP flag anymore. This means some obscure container/video combinations (e.g. the sample Film_200_zygo_pro.mov) are played flipped. ffplay/avplay doesn't handle this properly either, so we don't care and blame ffmeg/libav instead.
2013-02-09 14:15:19 +00:00
/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include "core/mp_talloc.h"
#include "core/bstr.h"
#include "core/mp_msg.h"
#include "codecs.h"
void mp_add_decoder(struct mp_decoder_list *list, const char *family,
const char *codec, const char *decoder, const char *desc)
{
struct mp_decoder_entry entry = {
.family = talloc_strdup(list, family),
.codec = talloc_strdup(list, codec),
.decoder = talloc_strdup(list, decoder),
.desc = talloc_strdup(list, desc),
};
MP_TARRAY_APPEND(list, list->entries, list->num_entries, entry);
}
static void mp_add_decoder_entry(struct mp_decoder_list *list,
struct mp_decoder_entry *entry)
{
mp_add_decoder(list, entry->family, entry->codec, entry->decoder,
entry->desc);
}
static struct mp_decoder_entry *find_decoder(struct mp_decoder_list *list,
bstr family, bstr decoder)
{
for (int n = 0; n < list->num_entries; n++) {
struct mp_decoder_entry *cur = &list->entries[n];
if (bstr_equals0(decoder, cur->decoder) &&
bstr_equals0(family, cur->family))
return cur;
}
return NULL;
}
// Add entry, but only if it's not yet on the list, and if the codec matches.
// If codec == NULL, don't compare codecs.
static void add_new(struct mp_decoder_list *to, struct mp_decoder_entry *entry,
const char *codec)
{
if (!entry || (codec && strcmp(entry->codec, codec) != 0))
return;
if (!find_decoder(to, bstr0(entry->family), bstr0(entry->decoder)))
mp_add_decoder_entry(to, entry);
}
// Select a decoder from the given list for the given codec. The selection
// can be influenced by the selection string, which can specify a priority
// list of preferred decoders.
// This returns a list of decoders to try, with the preferred decoders first.
// The selection string corresponds to --vd/--ad directly, and has the
// following syntax:
// selection = [<entry> ("," <entry>)*]
// entry = <family> ":" <decoder> // prefer decoder
// entry = <family> ":*" // prefer all decoders
// entry = "+" <family> ":" <decoder> // force a decoder
// entry = "-" <family> ":" <decoder> // exclude a decoder
// entry = "-" // don't add fallback decoders
// Forcing a decoder means it's added even if the codec mismatches.
struct mp_decoder_list *mp_select_decoders(struct mp_decoder_list *all,
const char *codec,
const char *selection)
{
struct mp_decoder_list *list = talloc_zero(NULL, struct mp_decoder_list);
struct mp_decoder_list *remove = talloc_zero(NULL, struct mp_decoder_list);
if (!codec)
codec = "unknown";
bool stop = false;
bstr sel = bstr0(selection);
while (sel.len) {
bstr entry;
bstr_split_tok(sel, ",", &entry, &sel);
if (bstr_equals0(entry, "-")) {
stop = true;
break;
}
bool force = bstr_eatstart0(&entry, "+");
bool exclude = !force && bstr_eatstart0(&entry, "-");
struct mp_decoder_list *dest = exclude ? remove : list;
bstr family, decoder;
if (!bstr_split_tok(entry, ":", &family, &decoder)) {
mp_msg(MSGT_CFGPARSER, MSGL_ERR, "Decoders must be specified as "
"'family:decoder' for the --ad/--vd options.\n");
break;
}
if (bstr_equals0(decoder, "*")) {
for (int n = 0; n < all->num_entries; n++) {
struct mp_decoder_entry *cur = &all->entries[n];
if (bstr_equals0(family, cur->family))
add_new(dest, cur, codec);
}
} else {
add_new(dest, find_decoder(all, family, decoder),
force ? NULL : codec);
}
}
if (!stop) {
// Add the remaining codecs which haven't been added yet
for (int n = 0; n < all->num_entries; n++)
add_new(list, &all->entries[n], codec);
}
for (int n = 0; n < remove->num_entries; n++) {
struct mp_decoder_entry *ex = &remove->entries[n];
struct mp_decoder_entry *del =
find_decoder(list, bstr0(ex->family), bstr0(ex->decoder));
if (del) {
int index = del - &list->entries[0];
MP_TARRAY_REMOVE_AT(list->entries, list->num_entries, index);
}
}
talloc_free(remove);
return list;
}
void mp_print_decoders(int msgt, int msgl, const char *header,
struct mp_decoder_list *list)
{
mp_msg(msgt, msgl, "%s\n", header);
for (int n = 0; n < list->num_entries; n++) {
struct mp_decoder_entry *entry = &list->entries[n];
mp_msg(msgt, msgl, " %s:%s", entry->family, entry->decoder);
if (strcmp(entry->decoder, entry->codec) != 0)
mp_msg(msgt, msgl, " (%s)", entry->codec);
mp_msg(msgt, msgl, " - %s\n", entry->desc);
}
if (list->num_entries == 0)
mp_msg(msgt, msgl, " (no decoders)\n");
}