mpv/sub/dec_sub.c

373 lines
10 KiB
C

/*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include "config.h"
#include "demux/stheader.h"
#include "sd.h"
#include "sub.h"
#include "dec_sub.h"
#include "subreader.h"
#include "core/options.h"
#include "core/mp_msg.h"
extern const struct sd_functions sd_ass;
extern const struct sd_functions sd_lavc;
extern const struct sd_functions sd_spu;
extern const struct sd_functions sd_movtext;
extern const struct sd_functions sd_srt;
extern const struct sd_functions sd_microdvd;
extern const struct sd_functions sd_lavc_conv;
static const struct sd_functions *sd_list[] = {
#ifdef CONFIG_ASS
&sd_ass,
#endif
&sd_lavc,
&sd_spu,
&sd_movtext,
&sd_srt,
&sd_microdvd,
&sd_lavc_conv,
NULL
};
#define MAX_NUM_SD 3
struct dec_sub {
struct MPOpts *opts;
struct sd init_sd;
struct sd *sd[MAX_NUM_SD];
int num_sd;
};
struct dec_sub *sub_create(struct MPOpts *opts)
{
struct dec_sub *sub = talloc_zero(NULL, struct dec_sub);
sub->opts = opts;
return sub;
}
static void sub_uninit(struct dec_sub *sub)
{
sub_reset(sub);
for (int n = 0; n < sub->num_sd; n++) {
if (sub->sd[n]->driver->uninit)
sub->sd[n]->driver->uninit(sub->sd[n]);
talloc_free(sub->sd[n]);
}
sub->num_sd = 0;
}
void sub_destroy(struct dec_sub *sub)
{
if (!sub)
return;
sub_uninit(sub);
talloc_free(sub);
}
bool sub_is_initialized(struct dec_sub *sub)
{
return !!sub->num_sd;
}
struct sd *sub_get_last_sd(struct dec_sub *sub)
{
return sub->num_sd ? sub->sd[sub->num_sd - 1] : NULL;
}
void sub_set_video_res(struct dec_sub *sub, int w, int h)
{
sub->init_sd.sub_video_w = w;
sub->init_sd.sub_video_h = h;
}
void sub_set_extradata(struct dec_sub *sub, void *data, int data_len)
{
sub->init_sd.extradata = data_len ? talloc_memdup(sub, data, data_len) : NULL;
sub->init_sd.extradata_len = data_len;
}
void sub_set_ass_renderer(struct dec_sub *sub, struct ass_library *ass_library,
struct ass_renderer *ass_renderer)
{
sub->init_sd.ass_library = ass_library;
sub->init_sd.ass_renderer = ass_renderer;
}
static void print_chain(struct dec_sub *sub)
{
mp_msg(MSGT_OSD, MSGL_V, "Subtitle filter chain: ");
for (int n = 0; n < sub->num_sd; n++) {
struct sd *sd = sub->sd[n];
mp_msg(MSGT_OSD, MSGL_V, "%s%s (%s)", n > 0 ? " -> " : "",
sd->driver->name, sd->codec);
}
mp_msg(MSGT_OSD, MSGL_V, "\n");
}
// Subtitles read with subreader.c
static void read_sub_data(struct dec_sub *sub, struct sub_data *subdata)
{
assert(sub_accept_packets_in_advance(sub));
char *temp = NULL;
struct sd *sd = sub_get_last_sd(sub);
sd->no_remove_duplicates = true;
for (int i = 0; i < subdata->sub_num; i++) {
subtitle *st = &subdata->subtitles[i];
// subdata is in 10 ms ticks, pts is in seconds
double t = subdata->sub_uses_time ? 0.01 : (1 / subdata->fallback_fps);
int len = 0;
for (int j = 0; j < st->lines; j++)
len += st->text[j] ? strlen(st->text[j]) : 0;
len += 2 * st->lines; // '\N', including the one after the last line
len += 6; // {\anX}
len += 1; // '\0'
if (talloc_get_size(temp) < len) {
talloc_free(temp);
temp = talloc_array(NULL, char, len);
}
char *p = temp;
char *end = p + len;
if (st->alignment)
p += snprintf(p, end - p, "{\\an%d}", st->alignment);
for (int j = 0; j < st->lines; j++)
p += snprintf(p, end - p, "%s\\N", st->text[j]);
if (st->lines > 0)
p -= 2; // remove last "\N"
*p = 0;
struct demux_packet pkt = {0};
pkt.pts = st->start * t;
pkt.duration = (st->end - st->start) * t;
pkt.buffer = temp;
pkt.len = strlen(temp);
sub_decode(sub, &pkt);
}
// Hack for broken FFmpeg packet format: make sd_ass keep the subtitle
// events on reset(), even though broken FFmpeg ASS packets were received
// (from sd_lavc_conv.c). Normally, these events are removed on seek/reset,
// but this is obviously unwanted in this case.
if (sd && sd->driver->fix_events)
sd->driver->fix_events(sd);
sd->no_remove_duplicates = false;
talloc_free(temp);
}
static int sub_init_decoder(struct dec_sub *sub, struct sd *sd)
{
sd->driver = NULL;
for (int n = 0; sd_list[n]; n++) {
if (sd_list[n]->supports_format(sd->codec)) {
sd->driver = sd_list[n];
break;
}
}
if (!sd->driver)
return -1;
if (sd->driver->init(sd) < 0)
return -1;
return 0;
}
void sub_init_from_sh(struct dec_sub *sub, struct sh_sub *sh)
{
assert(!sub->num_sd);
if (sh->extradata && !sub->init_sd.extradata)
sub_set_extradata(sub, sh->extradata, sh->extradata_len);
struct sd init_sd = sub->init_sd;
init_sd.codec = sh->gsh->codec;
init_sd.ass_track = sh->track;
while (sub->num_sd < MAX_NUM_SD) {
struct sd *sd = talloc(NULL, struct sd);
*sd = init_sd;
sd->opts = sub->opts;
if (sub_init_decoder(sub, sd) < 0) {
talloc_free(sd);
break;
}
sub->sd[sub->num_sd] = sd;
sub->num_sd++;
// Try adding new converters until a decoder is reached
if (sd->driver->get_bitmaps || sd->driver->get_text) {
print_chain(sub);
if (sh->sub_data)
read_sub_data(sub, sh->sub_data);
return;
}
init_sd = (struct sd) {
.codec = sd->output_codec,
.converted_from = sd->codec,
.extradata = sd->output_extradata,
.extradata_len = sd->output_extradata_len,
.ass_library = sub->init_sd.ass_library,
.ass_renderer = sub->init_sd.ass_renderer,
};
}
sub_uninit(sub);
mp_msg(MSGT_OSD, MSGL_ERR, "Could not find subtitle decoder for format '%s'.\n",
sh->gsh->codec ? sh->gsh->codec : "<unknown>");
}
bool sub_accept_packets_in_advance(struct dec_sub *sub)
{
// Converters are assumed to always accept packets in advance
struct sd *sd = sub_get_last_sd(sub);
return sd && sd->driver->accept_packets_in_advance;
}
static void decode_next(struct dec_sub *sub, int n, struct demux_packet *packet)
{
struct sd *sd = sub->sd[n];
sd->driver->decode(sd, packet);
if (n + 1 >= sub->num_sd || !sd->driver->get_converted)
return;
while (1) {
struct demux_packet *next =
sd->driver->get_converted ? sd->driver->get_converted(sd) : NULL;
if (!next)
break;
decode_next(sub, n + 1, next);
}
}
void sub_decode(struct dec_sub *sub, struct demux_packet *packet)
{
if (sub->num_sd > 0)
decode_next(sub, 0, packet);
}
void sub_get_bitmaps(struct dec_sub *sub, struct mp_osd_res dim, double pts,
struct sub_bitmaps *res)
{
struct MPOpts *opts = sub->opts;
struct sd *sd = sub_get_last_sd(sub);
*res = (struct sub_bitmaps) {0};
if (sd && opts->sub_visibility) {
if (sd->driver->get_bitmaps)
sd->driver->get_bitmaps(sd, dim, pts, res);
}
}
bool sub_has_get_text(struct dec_sub *sub)
{
struct sd *sd = sub_get_last_sd(sub);
return sd && sd->driver->get_text;
}
char *sub_get_text(struct dec_sub *sub, double pts)
{
struct MPOpts *opts = sub->opts;
struct sd *sd = sub_get_last_sd(sub);
char *text = NULL;
if (sd && opts->sub_visibility) {
if (sd->driver->get_text)
text = sd->driver->get_text(sd, pts);
}
return text;
}
void sub_reset(struct dec_sub *sub)
{
for (int n = 0; n < sub->num_sd; n++) {
if (sub->sd[n]->driver->reset)
sub->sd[n]->driver->reset(sub->sd[n]);
}
}
#define MAX_PACKETS 10
#define MAX_BYTES 10000
struct sd_conv_buffer {
struct demux_packet pkt[MAX_PACKETS];
int num_pkt;
int read_pkt;
char buffer[MAX_BYTES];
int cur_buffer;
};
void sd_conv_add_packet(struct sd *sd, void *data, int data_len, double pts,
double duration)
{
if (!sd->sd_conv_buffer)
sd->sd_conv_buffer = talloc_zero(sd, struct sd_conv_buffer);
struct sd_conv_buffer *buf = sd->sd_conv_buffer;
if (buf->num_pkt >= MAX_PACKETS || buf->cur_buffer + data_len + 1 > MAX_BYTES)
goto out_of_space;
if (buf->read_pkt == buf->num_pkt)
sd_conv_def_reset(sd);
assert(buf->read_pkt == 0); // no mixing of reading/adding allowed
struct demux_packet *pkt = &buf->pkt[buf->num_pkt++];
*pkt = (struct demux_packet) {
.buffer = &buf->buffer[buf->cur_buffer],
.len = data_len,
.pts = pts,
.duration = duration,
};
memcpy(pkt->buffer, data, data_len);
pkt->buffer[data_len] = 0;
buf->cur_buffer += data_len + 1;
return;
out_of_space:
mp_msg(MSGT_OSD, MSGL_ERR, "Subtitle too big.\n");
}
struct demux_packet *sd_conv_def_get_converted(struct sd *sd)
{
struct sd_conv_buffer *buf = sd->sd_conv_buffer;
if (buf && buf->read_pkt < buf->num_pkt)
return &buf->pkt[buf->read_pkt++];
return NULL;
}
void sd_conv_def_reset(struct sd *sd)
{
struct sd_conv_buffer *buf = sd->sd_conv_buffer;
if (buf) {
buf->read_pkt = buf->num_pkt = 0;
buf->cur_buffer = 0;
}
}