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mpv/sub/sd_lavc.c

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