mirror of https://github.com/mpv-player/mpv
280 lines
8.7 KiB
C
280 lines
8.7 KiB
C
/*
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* This file is part of mplayer2.
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*
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* mplayer2 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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* mplayer2 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 mplayer2. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <assert.h>
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#include <libavcodec/avcodec.h>
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#include <libavutil/common.h>
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#include "talloc.h"
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#include "mpvcore/mp_msg.h"
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#include "mpvcore/av_common.h"
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#include "mpvcore/options.h"
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#include "demux/stheader.h"
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#include "sd.h"
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#include "dec_sub.h"
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#include "sub.h"
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struct sd_lavc_priv {
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AVCodecContext *avctx;
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AVSubtitle sub;
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bool have_sub;
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int count;
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struct sub_bitmap *inbitmaps;
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struct sub_bitmap *outbitmaps;
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struct osd_bmp_indexed *imgs;
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bool bitmaps_changed;
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double pts;
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double endpts;
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};
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static bool supports_format(const char *format)
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{
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enum AVCodecID cid = mp_codec_to_av_codec_id(format);
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// Supported codecs must be known to decode to paletted bitmaps
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switch (cid) {
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case AV_CODEC_ID_DVB_SUBTITLE:
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case AV_CODEC_ID_HDMV_PGS_SUBTITLE:
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case AV_CODEC_ID_XSUB:
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// lavc dvdsubdec doesn't read color/resolution on Libav 9.1 and below,
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// so fall back to sd_spu in this case. Never use sd_spu with new ffmpeg;
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// spudec can't handle ffmpeg .idx demuxing (added to lavc in 54.79.100).
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#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(54, 40, 0)
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case AV_CODEC_ID_DVD_SUBTITLE:
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#endif
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return true;
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default:
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return false;
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}
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}
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static void guess_resolution(enum AVCodecID type, int *w, int *h)
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{
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if (type == AV_CODEC_ID_DVD_SUBTITLE) {
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/* XXX Although the video frame is some size, the SPU frame is
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always maximum size i.e. 720 wide and 576 or 480 high */
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// For HD files in MKV the VobSub resolution can be higher though,
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// see largeres_vobsub.mkv
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if (*w <= 720 && *h <= 576) {
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*w = 720;
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*h = (*h == 480 || *h == 240) ? 480 : 576;
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}
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} else {
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// Hope that PGS subs set these and 720/576 works for dvb subs
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if (!*w)
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*w = 720;
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if (!*h)
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*h = 576;
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}
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}
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static int init(struct sd *sd)
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{
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struct sd_lavc_priv *priv = talloc_zero(NULL, struct sd_lavc_priv);
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enum AVCodecID cid = mp_codec_to_av_codec_id(sd->codec);
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AVCodecContext *ctx = NULL;
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AVCodec *sub_codec = avcodec_find_decoder(cid);
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if (!sub_codec)
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goto error;
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ctx = avcodec_alloc_context3(sub_codec);
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if (!ctx)
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goto error;
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ctx->extradata_size = sd->extradata_len;
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ctx->extradata = sd->extradata;
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if (avcodec_open2(ctx, sub_codec, NULL) < 0)
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goto error;
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priv->avctx = ctx;
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sd->priv = priv;
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return 0;
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error:
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mp_msg(MSGT_SUBREADER, MSGL_ERR,
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"Could not open libavcodec subtitle decoder\n");
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av_free(ctx);
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talloc_free(priv);
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return -1;
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}
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static void clear(struct sd_lavc_priv *priv)
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{
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priv->count = 0;
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talloc_free(priv->inbitmaps);
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talloc_free(priv->outbitmaps);
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priv->inbitmaps = priv->outbitmaps = NULL;
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talloc_free(priv->imgs);
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priv->imgs = NULL;
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priv->bitmaps_changed = true;
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priv->pts = MP_NOPTS_VALUE;
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priv->endpts = MP_NOPTS_VALUE;
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if (priv->have_sub)
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avsubtitle_free(&priv->sub);
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priv->have_sub = false;
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}
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static void decode(struct sd *sd, struct demux_packet *packet)
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{
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struct MPOpts *opts = sd->opts;
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struct sd_lavc_priv *priv = sd->priv;
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AVCodecContext *ctx = priv->avctx;
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double pts = packet->pts;
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double duration = packet->duration;
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AVSubtitle sub;
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AVPacket pkt;
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// libavformat sets duration==0, even if the duration is unknown.
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// Assume there are no bitmap subs that actually use duration==0 for
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// hidden subtitle events.
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if (duration == 0)
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duration = -1;
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clear(priv);
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av_init_packet(&pkt);
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pkt.data = packet->buffer;
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pkt.size = packet->len;
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pkt.pts = pts * 1000;
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if (duration >= 0)
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pkt.convergence_duration = duration * 1000;
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int got_sub;
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int res = avcodec_decode_subtitle2(ctx, &sub, &got_sub, &pkt);
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if (res < 0 || !got_sub)
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return;
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priv->sub = sub;
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priv->have_sub = true;
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if (pts != MP_NOPTS_VALUE) {
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if (sub.end_display_time > sub.start_display_time)
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duration = (sub.end_display_time - sub.start_display_time) / 1000.0;
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pts += sub.start_display_time / 1000.0;
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}
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double endpts = MP_NOPTS_VALUE;
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if (pts != MP_NOPTS_VALUE && duration >= 0)
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endpts = pts + duration;
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if (sub.num_rects > 0) {
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switch (sub.rects[0]->type) {
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case SUBTITLE_BITMAP:
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priv->count = 0;
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priv->pts = pts;
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priv->endpts = endpts;
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priv->inbitmaps = talloc_array(priv, struct sub_bitmap,
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sub.num_rects);
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priv->imgs = talloc_array(priv, struct osd_bmp_indexed,
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sub.num_rects);
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for (int i = 0; i < sub.num_rects; i++) {
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struct AVSubtitleRect *r = sub.rects[i];
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struct sub_bitmap *b = &priv->inbitmaps[i];
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struct osd_bmp_indexed *img = &priv->imgs[i];
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if (!(r->flags & AV_SUBTITLE_FLAG_FORCED) &&
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opts->forced_subs_only)
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continue;
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img->bitmap = r->pict.data[0];
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assert(r->nb_colors > 0);
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assert(r->nb_colors * 4 <= sizeof(img->palette));
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memcpy(img->palette, r->pict.data[1], r->nb_colors * 4);
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b->bitmap = img;
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b->stride = r->pict.linesize[0];
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b->w = r->w;
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b->h = r->h;
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b->x = r->x;
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b->y = r->y;
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priv->count++;
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}
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break;
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default:
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mp_msg(MSGT_SUBREADER, MSGL_ERR, "sd_lavc: unsupported subtitle "
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"type from libavcodec\n");
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break;
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}
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}
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}
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static void get_bitmaps(struct sd *sd, struct mp_osd_res d, double pts,
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struct sub_bitmaps *res)
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{
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struct sd_lavc_priv *priv = sd->priv;
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if (priv->pts != MP_NOPTS_VALUE && pts < priv->pts)
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return;
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if (priv->endpts != MP_NOPTS_VALUE && (pts >= priv->endpts ||
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pts < priv->endpts - 300))
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clear(priv);
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if (priv->bitmaps_changed && priv->count > 0)
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priv->outbitmaps = talloc_memdup(priv, priv->inbitmaps,
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talloc_get_size(priv->inbitmaps));
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int inw = priv->avctx->width;
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int inh = priv->avctx->height;
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guess_resolution(priv->avctx->codec_id, &inw, &inh);
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int vidw = d.w - d.ml - d.mr;
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int vidh = d.h - d.mt - d.mb;
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double xscale = (double)vidw / inw;
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double yscale = (double)vidh / inh;
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if (priv->avctx->codec_id == AV_CODEC_ID_DVD_SUBTITLE) {
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// For DVD subs, try to keep the subtitle PAR at display PAR.
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if (d.video_par > 1.0) {
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xscale /= d.video_par;
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} else {
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yscale *= d.video_par;
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}
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}
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int cx = vidw / 2 - (int)(inw * xscale) / 2;
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int cy = vidh / 2 - (int)(inh * yscale) / 2;
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for (int i = 0; i < priv->count; i++) {
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struct sub_bitmap *bi = &priv->inbitmaps[i];
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struct sub_bitmap *bo = &priv->outbitmaps[i];
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bo->x = bi->x * xscale + cx + d.ml;
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bo->y = bi->y * yscale + cy + d.mt;
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bo->dw = bi->w * xscale;
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bo->dh = bi->h * yscale;
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}
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res->parts = priv->outbitmaps;
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res->num_parts = priv->count;
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if (priv->bitmaps_changed)
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res->bitmap_id = ++res->bitmap_pos_id;
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priv->bitmaps_changed = false;
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res->format = SUBBITMAP_INDEXED;
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res->scaled = xscale != 1 || yscale != 1;
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}
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static void reset(struct sd *sd)
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{
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struct sd_lavc_priv *priv = sd->priv;
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if (priv->pts == MP_NOPTS_VALUE)
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clear(priv);
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// lavc might not do this right for all codecs; may need close+reopen
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avcodec_flush_buffers(priv->avctx);
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}
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static void uninit(struct sd *sd)
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{
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struct sd_lavc_priv *priv = sd->priv;
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clear(priv);
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avcodec_close(priv->avctx);
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av_free(priv->avctx);
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talloc_free(priv);
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}
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const struct sd_functions sd_lavc = {
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.name = "lavc",
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.supports_format = supports_format,
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.init = init,
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.decode = decode,
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.get_bitmaps = get_bitmaps,
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.reset = reset,
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.uninit = uninit,
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};
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