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/*
* 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 <stdlib.h>
#include <assert.h>
#include <libavcodec/avcodec.h>
#include <libavutil/intreadwrite.h>
#include <libavutil/common.h>
#include "config.h"
#include "talloc.h"
#include "mpvcore/mp_msg.h"
#include "mpvcore/av_common.h"
#include "mpvcore/bstr.h"
#include "sd.h"
struct sd_lavc_priv {
AVCodecContext *avctx;
};
static bool supports_format(const char *format)
{
enum AVCodecID cid = mp_codec_to_av_codec_id(format);
const AVCodecDescriptor *desc = avcodec_descriptor_get(cid);
if (!desc)
return false;
// These are known to support AVSubtitleRect->ass.
const char *whitelist[] =
{"text", "ass", "ssa", "srt", "subrip", "microdvd", "mpl2",
"jacosub", "pjs", "sami", "realtext", "subviewer", "subviewer1",
"vplayer", "webvtt", 0};
for (int n = 0; whitelist[n]; n++) {
if (strcmp(format, whitelist[n]) == 0)
return true;
}
return false;
}
// Disable style definitions generated by the libavcodec converter.
// We always want the user defined style instead.
static void disable_styles(bstr header)
{
while (header.len) {
int n = bstr_find(header, bstr0("\nStyle: "));
if (n < 0)
break;
header.start[n + 1] = '#'; // turn into a comment
header = bstr_cut(header, 2);
}
}
static int init(struct sd *sd)
{
struct sd_lavc_priv *priv = talloc_zero(NULL, struct sd_lavc_priv);
AVCodecContext *avctx = NULL;
AVCodec *codec = avcodec_find_decoder(mp_codec_to_av_codec_id(sd->codec));
if (!codec)
goto error;
avctx = avcodec_alloc_context3(codec);
if (!avctx)
goto error;
avctx->extradata_size = sd->extradata_len;
avctx->extradata = sd->extradata;
if (avcodec_open2(avctx, codec, NULL) < 0)
goto error;
// Documented as "set by libavcodec", but there is no other way
avctx->time_base = (AVRational) {1, 1000};
priv->avctx = avctx;
sd->priv = priv;
sd->output_codec = "ssa";
sd->output_extradata = avctx->subtitle_header;
sd->output_extradata_len = avctx->subtitle_header_size;
if (sd->output_extradata) {
sd->output_extradata = talloc_memdup(sd, sd->output_extradata,
sd->output_extradata_len);
disable_styles((bstr){sd->output_extradata, sd->output_extradata_len});
}
return 0;
error:
mp_msg(MSGT_SUBREADER, MSGL_ERR,
"Could not open libavcodec subtitle converter\n");
av_free(avctx);
talloc_free(priv);
return -1;
}
static void decode(struct sd *sd, struct demux_packet *packet)
{
struct sd_lavc_priv *priv = sd->priv;
AVCodecContext *avctx = priv->avctx;
double ts = av_q2d(av_inv_q(avctx->time_base));
AVSubtitle sub = {0};
AVPacket pkt;
int ret, got_sub;
mp_set_av_packet(&pkt, packet);
pkt.pts = packet->pts == MP_NOPTS_VALUE ? AV_NOPTS_VALUE : packet->pts * ts;
pkt.duration = packet->duration * ts;
ret = avcodec_decode_subtitle2(avctx, &sub, &got_sub, &pkt);
if (ret < 0) {
mp_msg(MSGT_OSD, MSGL_ERR, "Error decoding subtitle\n");
} else if (got_sub) {
for (int i = 0; i < sub.num_rects; i++) {
char *ass_line = sub.rects[i]->ass;
if (!ass_line)
break;
// This might contain embedded timestamps, using the "old" ffmpeg
// ASS packet format, in which case pts/duration might be ignored
// at a later point.
sd_conv_add_packet(sd, ass_line, strlen(ass_line),
packet->pts, packet->duration);
}
}
avsubtitle_free(&sub);
}
static void reset(struct sd *sd)
{
struct sd_lavc_priv *priv = sd->priv;
avcodec_flush_buffers(priv->avctx);
sd_conv_def_reset(sd);
}
static void uninit(struct sd *sd)
{
struct sd_lavc_priv *priv = sd->priv;
avcodec_close(priv->avctx);
av_free(priv->avctx);
talloc_free(priv);
}
const struct sd_functions sd_lavc_conv = {
.name = "lavc_conv",
.supports_format = supports_format,
.init = init,
.decode = decode,
.get_converted = sd_conv_def_get_converted,
.reset = reset,
.uninit = uninit,
};
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