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mpv/sub/sd_ass.c
Mohammad AlSaleh d470766000 sub: add --sub-stretch-durations option 
Stretch a subtitle duration so it ends when the next one starts.
 Should help with subtitles which erroneously have zero durations.

 I found such a subrip substitles stream in the wild.

Signed-off-by: Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com>
2023-11-07 20:46:40 +00:00

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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 Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <math.h>
#include <limits.h>
#include <libavutil/common.h>
#include <ass/ass.h>
#include "mpv_talloc.h"
#include "config.h"
#include "options/m_config.h"
#include "options/options.h"
#include "common/common.h"
#include "common/msg.h"
#include "demux/demux.h"
#include "video/csputils.h"
#include "video/mp_image.h"
#include "dec_sub.h"
#include "ass_mp.h"
#include "sd.h"
struct sd_ass_priv {
struct ass_library *ass_library;
struct ass_renderer *ass_renderer;
struct ass_track *ass_track;
struct ass_track *shadow_track; // for --sub-ass=no rendering
bool ass_configured;
bool is_converted;
struct lavc_conv *converter;
struct sd_filter **filters;
int num_filters;
bool clear_once;
bool on_top;
struct mp_ass_packer *packer;
struct sub_bitmap_copy_cache *copy_cache;
char last_text[500];
struct mp_image_params video_params;
struct mp_image_params last_params;
struct mp_osd_res osd;
int64_t *seen_packets;
int num_seen_packets;
bool duration_unknown;
};
static void mangle_colors(struct sd *sd, struct sub_bitmaps *parts);
static void fill_plaintext(struct sd *sd, double pts);
static const struct sd_filter_functions *const filters[] = {
// Note: list order defines filter order.
&sd_filter_sdh,
#if HAVE_POSIX
&sd_filter_regex,
#endif
#if HAVE_JAVASCRIPT
&sd_filter_jsre,
#endif
NULL,
};
// Add default styles, if the track does not have any styles yet.
// Apply style overrides if the user provides any.
static void mp_ass_add_default_styles(ASS_Track *track, struct mp_subtitle_opts *opts)
{
if (opts->ass_styles_file && opts->ass_style_override)
ass_read_styles(track, opts->ass_styles_file, NULL);
if (track->n_styles == 0) {
if (!track->PlayResY) {
track->PlayResX = MP_ASS_FONT_PLAYRESX;
track->PlayResY = MP_ASS_FONT_PLAYRESY;
}
track->Kerning = true;
int sid = ass_alloc_style(track);
track->default_style = sid;
ASS_Style *style = track->styles + sid;
style->Name = strdup("Default");
mp_ass_set_style(style, track->PlayResY, opts->sub_style);
}
if (opts->ass_style_override)
ass_process_force_style(track);
}
static const char *const font_mimetypes[] = {
"application/x-truetype-font",
"application/vnd.ms-opentype",
"application/x-font-ttf",
"application/x-font", // probably incorrect
"application/font-sfnt",
"font/collection",
"font/otf",
"font/sfnt",
"font/ttf",
NULL
};
static const char *const font_exts[] = {".ttf", ".ttc", ".otf", ".otc", NULL};
static bool attachment_is_font(struct mp_log *log, struct demux_attachment *f)
{
if (!f->name || !f->type || !f->data || !f->data_size)
return false;
for (int n = 0; font_mimetypes[n]; n++) {
if (strcmp(font_mimetypes[n], f->type) == 0)
return true;
}
// fallback: match against file extension
char *ext = strlen(f->name) > 4 ? f->name + strlen(f->name) - 4 : "";
for (int n = 0; font_exts[n]; n++) {
if (strcasecmp(ext, font_exts[n]) == 0) {
mp_warn(log, "Loading font attachment '%s' with MIME type %s. "
"Assuming this is a broken Matroska file, which was "
"muxed without setting a correct font MIME type.\n",
f->name, f->type);
return true;
}
}
return false;
}
static void add_subtitle_fonts(struct sd *sd)
{
struct sd_ass_priv *ctx = sd->priv;
struct mp_subtitle_opts *opts = sd->opts;
if (!opts->ass_enabled || !opts->use_embedded_fonts || !sd->attachments)
return;
for (int i = 0; i < sd->attachments->num_entries; i++) {
struct demux_attachment *f = &sd->attachments->entries[i];
if (attachment_is_font(sd->log, f))
ass_add_font(ctx->ass_library, f->name, f->data, f->data_size);
}
}
static void filters_destroy(struct sd *sd)
{
struct sd_ass_priv *ctx = sd->priv;
for (int n = 0; n < ctx->num_filters; n++) {
struct sd_filter *ft = ctx->filters[n];
if (ft->driver->uninit)
ft->driver->uninit(ft);
talloc_free(ft);
}
ctx->num_filters = 0;
}
static void filters_init(struct sd *sd)
{
struct sd_ass_priv *ctx = sd->priv;
filters_destroy(sd);
for (int n = 0; filters[n]; n++) {
struct sd_filter *ft = talloc_ptrtype(ctx, ft);
*ft = (struct sd_filter){
.global = sd->global,
.log = sd->log,
.opts = mp_get_config_group(ft, sd->global, &mp_sub_filter_opts),
.driver = filters[n],
.codec = "ass",
.event_format = ctx->ass_track->event_format,
};
if (ft->driver->init(ft)) {
MP_TARRAY_APPEND(ctx, ctx->filters, ctx->num_filters, ft);
} else {
talloc_free(ft);
}
}
}
static void enable_output(struct sd *sd, bool enable)
{
struct sd_ass_priv *ctx = sd->priv;
if (enable == !!ctx->ass_renderer)
return;
if (ctx->ass_renderer) {
ass_renderer_done(ctx->ass_renderer);
ctx->ass_renderer = NULL;
} else {
ctx->ass_renderer = ass_renderer_init(ctx->ass_library);
mp_ass_configure_fonts(ctx->ass_renderer, sd->opts->sub_style,
sd->global, sd->log);
}
}
static void assobjects_init(struct sd *sd)
{
struct sd_ass_priv *ctx = sd->priv;
struct mp_subtitle_opts *opts = sd->opts;
ctx->ass_library = mp_ass_init(sd->global, sd->opts->sub_style, sd->log);
ass_set_extract_fonts(ctx->ass_library, opts->use_embedded_fonts);
add_subtitle_fonts(sd);
if (opts->ass_style_override)
ass_set_style_overrides(ctx->ass_library, opts->ass_style_override_list);
ctx->ass_track = ass_new_track(ctx->ass_library);
ctx->ass_track->track_type = TRACK_TYPE_ASS;
ctx->shadow_track = ass_new_track(ctx->ass_library);
ctx->shadow_track->PlayResX = MP_ASS_FONT_PLAYRESX;
ctx->shadow_track->PlayResY = MP_ASS_FONT_PLAYRESY;
mp_ass_add_default_styles(ctx->shadow_track, opts);
char *extradata = sd->codec->extradata;
int extradata_size = sd->codec->extradata_size;
if (ctx->converter) {
extradata = lavc_conv_get_extradata(ctx->converter);
extradata_size = extradata ? strlen(extradata) : 0;
}
if (extradata)
ass_process_codec_private(ctx->ass_track, extradata, extradata_size);
mp_ass_add_default_styles(ctx->ass_track, opts);
#if LIBASS_VERSION >= 0x01302000
ass_set_check_readorder(ctx->ass_track, sd->opts->sub_clear_on_seek ? 0 : 1);
#endif
enable_output(sd, true);
}
static void assobjects_destroy(struct sd *sd)
{
struct sd_ass_priv *ctx = sd->priv;
ass_free_track(ctx->ass_track);
ass_free_track(ctx->shadow_track);
enable_output(sd, false);
ass_library_done(ctx->ass_library);
}
static int init(struct sd *sd)
{
struct sd_ass_priv *ctx = talloc_zero(sd, struct sd_ass_priv);
sd->priv = ctx;
// Note: accept "null" as alias for "ass", so EDL delay_open subtitle
// streams work.
if (strcmp(sd->codec->codec, "ass") != 0 &&
strcmp(sd->codec->codec, "null") != 0)
{
ctx->is_converted = true;
ctx->converter = lavc_conv_create(sd->log, sd->codec);
if (!ctx->converter)
return -1;
if (strcmp(sd->codec->codec, "eia_608") == 0)
ctx->duration_unknown = 1;
}
assobjects_init(sd);
filters_init(sd);
ctx->packer = mp_ass_packer_alloc(ctx);
return 0;
}
// Note: pkt is not necessarily a fully valid refcounted packet.
static void filter_and_add(struct sd *sd, struct demux_packet *pkt)
{
struct sd_ass_priv *ctx = sd->priv;
struct demux_packet *orig_pkt = pkt;
for (int n = 0; n < ctx->num_filters; n++) {
struct sd_filter *ft = ctx->filters[n];
struct demux_packet *npkt = ft->driver->filter(ft, pkt);
if (pkt != npkt && pkt != orig_pkt)
talloc_free(pkt);
pkt = npkt;
if (!pkt)
return;
}
ass_process_chunk(ctx->ass_track, pkt->buffer, pkt->len,
llrint(pkt->pts * 1000),
llrint(pkt->duration * 1000));
if (pkt != orig_pkt)
talloc_free(pkt);
}
// Test if the packet with the given file position (used as unique ID) was
// already consumed. Return false if the packet is new (and add it to the
// internal list), and return true if it was already seen.
static bool check_packet_seen(struct sd *sd, int64_t pos)
{
struct sd_ass_priv *priv = sd->priv;
int a = 0;
int b = priv->num_seen_packets;
while (a < b) {
int mid = a + (b - a) / 2;
int64_t val = priv->seen_packets[mid];
if (pos == val)
return true;
if (pos > val) {
a = mid + 1;
} else {
b = mid;
}
}
MP_TARRAY_INSERT_AT(priv, priv->seen_packets, priv->num_seen_packets, a, pos);
return false;
}
#define UNKNOWN_DURATION (INT_MAX / 1000)
static void decode(struct sd *sd, struct demux_packet *packet)
{
struct sd_ass_priv *ctx = sd->priv;
ASS_Track *track = ctx->ass_track;
if (ctx->converter) {
if (!sd->opts->sub_clear_on_seek && packet->pos >= 0 &&
check_packet_seen(sd, packet->pos))
return;
double sub_pts = 0;
double sub_duration = 0;
char **r = lavc_conv_decode(ctx->converter, packet, &sub_pts,
&sub_duration);
if (sd->opts->sub_stretch_durations ||
packet->duration < 0 || sub_duration == UINT32_MAX) {
if (!ctx->duration_unknown) {
MP_WARN(sd, "Subtitle with unknown duration.\n");
ctx->duration_unknown = true;
}
sub_duration = UNKNOWN_DURATION;
}
for (int n = 0; r && r[n]; n++) {
struct demux_packet pkt2 = {
.pts = sub_pts,
.duration = sub_duration,
.buffer = r[n],
.len = strlen(r[n]),
};
filter_and_add(sd, &pkt2);
}
if (ctx->duration_unknown) {
for (int n = track->n_events - 2; n >= 0; n--) {
if (track->events[n].Duration == UNKNOWN_DURATION * 1000) {
if (track->events[n].Start != track->events[n + 1].Start) {
track->events[n].Duration = track->events[n + 1].Start -
track->events[n].Start;
} else {
track->events[n].Duration = track->events[n + 1].Duration;
}
}
}
}
} else {
// Note that for this packet format, libass has an internal mechanism
// for discarding duplicate (already seen) packets.
filter_and_add(sd, packet);
}
}
static void configure_ass(struct sd *sd, struct mp_osd_res *dim,
bool converted, ASS_Track *track)
{
struct mp_subtitle_opts *opts = sd->opts;
struct sd_ass_priv *ctx = sd->priv;
ASS_Renderer *priv = ctx->ass_renderer;
ass_set_frame_size(priv, dim->w, dim->h);
ass_set_margins(priv, dim->mt, dim->mb, dim->ml, dim->mr);
bool set_use_margins = false;
float set_sub_pos = 0.0f;
float set_line_spacing = 0;
float set_font_scale = 1;
int set_hinting = 0;
bool set_scale_with_window = false;
bool set_scale_by_window = true;
bool total_override = false;
// With forced overrides, apply the --sub-* specific options
if (converted || opts->ass_style_override == 3) { // 'force'
set_scale_with_window = opts->sub_scale_with_window;
set_use_margins = opts->sub_use_margins;
set_scale_by_window = opts->sub_scale_by_window;
total_override = true;
} else {
set_scale_with_window = opts->ass_scale_with_window;
set_use_margins = opts->ass_use_margins;
}
if (converted || opts->ass_style_override) {
set_sub_pos = 100.0f - opts->sub_pos;
set_line_spacing = opts->ass_line_spacing;
set_hinting = opts->ass_hinting;
set_font_scale = opts->sub_scale;
}
if (set_scale_with_window) {
int vidh = dim->h - (dim->mt + dim->mb);
set_font_scale *= dim->h / (float)MPMAX(vidh, 1);
}
if (!set_scale_by_window) {
double factor = dim->h / 720.0;
if (factor != 0.0)
set_font_scale /= factor;
}
ass_set_use_margins(priv, set_use_margins);
ass_set_line_position(priv, set_sub_pos);
ass_set_shaper(priv, opts->ass_shaper);
int set_force_flags = 0;
if (total_override)
set_force_flags |= ASS_OVERRIDE_BIT_STYLE | ASS_OVERRIDE_BIT_SELECTIVE_FONT_SCALE;
if (opts->ass_style_override == 4) // 'scale'
set_force_flags |= ASS_OVERRIDE_BIT_SELECTIVE_FONT_SCALE;
if (converted)
set_force_flags |= ASS_OVERRIDE_BIT_ALIGNMENT;
#ifdef ASS_JUSTIFY_AUTO
if ((converted || opts->ass_style_override) && opts->ass_justify)
set_force_flags |= ASS_OVERRIDE_BIT_JUSTIFY;
#endif
ass_set_selective_style_override_enabled(priv, set_force_flags);
ASS_Style style = {0};
mp_ass_set_style(&style, MP_ASS_FONT_PLAYRESY, opts->sub_style);
ass_set_selective_style_override(priv, &style);
free(style.FontName);
if (converted && track->default_style < track->n_styles) {
mp_ass_set_style(track->styles + track->default_style,
track->PlayResY, opts->sub_style);
}
ass_set_font_scale(priv, set_font_scale);
ass_set_hinting(priv, set_hinting);
ass_set_line_spacing(priv, set_line_spacing);
#if LIBASS_VERSION >= 0x01600010
if (converted)
ass_track_set_feature(track, ASS_FEATURE_WRAP_UNICODE, 1);
#endif
if (converted) {
bool override_playres = true;
char **ass_style_override_list = opts->ass_style_override_list;
for (int i = 0; ass_style_override_list && ass_style_override_list[i]; i++) {
if (bstr_find0(bstr0(ass_style_override_list[i]), "PlayResX") >= 0)
override_playres = false;
}
// srt to ass conversion from ffmpeg has fixed PlayResX of 384 with an
// aspect of 4:3. Starting with libass f08f8ea5 (pre 0.17) PlayResX
// affects shadow and border widths, among others, so to render borders
// and shadows correctly, we adjust PlayResX according to the DAR.
// But PlayResX also affects margins, so we adjust those too.
// This should ensure basic srt-to-ass ffmpeg conversion has correct
// borders, but there could be other issues with some srt extensions
// and/or different source formats which would be exposed over time.
// Make these adjustments only if the user didn't set PlayResX.
if (override_playres) {
int vidw = dim->w - (dim->ml + dim->mr);
int vidh = dim->h - (dim->mt + dim->mb);
track->PlayResX = track->PlayResY * (double)vidw / MPMAX(vidh, 1);
// ffmpeg and mpv use a default PlayResX of 384 when it is not known,
// this comes from VSFilter.
double fix_margins = track->PlayResX / (double)MP_ASS_FONT_PLAYRESX;
track->styles->MarginL = round(track->styles->MarginL * fix_margins);
track->styles->MarginR = round(track->styles->MarginR * fix_margins);
}
}
}
static bool has_overrides(char *s)
{
if (!s)
return false;
return strstr(s, "\\pos") || strstr(s, "\\move") || strstr(s, "\\clip") ||
strstr(s, "\\iclip") || strstr(s, "\\org") || strstr(s, "\\p");
}
#define END(ev) ((ev)->Start + (ev)->Duration)
static long long find_timestamp(struct sd *sd, double pts)
{
struct sd_ass_priv *priv = sd->priv;
if (pts == MP_NOPTS_VALUE)
return 0;
long long ts = llrint(pts * 1000);
if (!sd->opts->sub_fix_timing || sd->opts->ass_style_override == 0)
return ts;
// Try to fix small gaps and overlaps.
ASS_Track *track = priv->ass_track;
int threshold = SUB_GAP_THRESHOLD * 1000;
int keep = SUB_GAP_KEEP * 1000;
// Find the "current" event.
ASS_Event *ev[2] = {0};
int n_ev = 0;
for (int n = 0; n < track->n_events; n++) {
ASS_Event *event = &track->events[n];
if (ts >= event->Start - threshold && ts <= END(event) + threshold) {
if (n_ev >= MP_ARRAY_SIZE(ev))
return ts; // multiple overlaps - give up (probably complex subs)
ev[n_ev++] = event;
}
}
if (n_ev != 2)
return ts;
// Simple/minor heuristic against destroying typesetting.
if (ev[0]->Style != ev[1]->Style || has_overrides(ev[0]->Text) ||
has_overrides(ev[1]->Text))
return ts;
// Sort by start timestamps.
if (ev[0]->Start > ev[1]->Start)
MPSWAP(ASS_Event*, ev[0], ev[1]);
// We want to fix partial overlaps only.
if (END(ev[0]) >= END(ev[1]))
return ts;
if (ev[0]->Duration < keep || ev[1]->Duration < keep)
return ts;
// Gap between the events -> move ts to show the end of the first event.
if (ts >= END(ev[0]) && ts < ev[1]->Start && END(ev[0]) < ev[1]->Start &&
END(ev[0]) + threshold >= ev[1]->Start)
return END(ev[0]) - 1;
// Overlap -> move ts to the (exclusive) end of the first event.
// Relies on the fact that the ASS_Renderer has no overlap registered, even
// if there is one. This happens to work because we never render the
// overlapped state, and libass never resolves a collision.
if (ts >= ev[1]->Start && ts <= END(ev[0]) && END(ev[0]) > ev[1]->Start &&
END(ev[0]) <= ev[1]->Start + threshold)
return END(ev[0]);
return ts;
}
#undef END
static struct sub_bitmaps *get_bitmaps(struct sd *sd, struct mp_osd_res dim,
int format, double pts)
{
struct sd_ass_priv *ctx = sd->priv;
struct mp_subtitle_opts *opts = sd->opts;
bool no_ass = !opts->ass_enabled || ctx->on_top ||
opts->ass_style_override == 5;
bool converted = ctx->is_converted || no_ass;
ASS_Track *track = no_ass ? ctx->shadow_track : ctx->ass_track;
ASS_Renderer *renderer = ctx->ass_renderer;
struct sub_bitmaps *res = &(struct sub_bitmaps){0};
// Always update the osd_res
struct mp_osd_res old_osd = ctx->osd;
ctx->osd = dim;
if (pts == MP_NOPTS_VALUE || !renderer)
goto done;
// Currently no supported text sub formats support a distinction between forced
// and unforced lines, so we just assume everything's unforced and discard everything.
// If we ever see a format that makes this distinction, we can add support here.
if (opts->sub_forced_events_only)
goto done;
double scale = dim.display_par;
if (!converted && (!opts->ass_style_override ||
opts->ass_vsfilter_aspect_compat))
{
// Let's use the original video PAR for vsfilter compatibility:
double par = ctx->video_params.p_w / (double)ctx->video_params.p_h;
if (isnormal(par))
scale *= par;
}
if (!ctx->ass_configured || !osd_res_equals(old_osd, ctx->osd)) {
configure_ass(sd, &dim, converted, track);
ctx->ass_configured = true;
}
ass_set_pixel_aspect(renderer, scale);
if (!converted && (!opts->ass_style_override ||
opts->ass_vsfilter_blur_compat))
{
ass_set_storage_size(renderer, ctx->video_params.w, ctx->video_params.h);
} else {
ass_set_storage_size(renderer, 0, 0);
}
long long ts = find_timestamp(sd, pts);
if (ctx->duration_unknown && pts != MP_NOPTS_VALUE) {
mp_ass_flush_old_events(track, ts);
ctx->num_seen_packets = 0;
sd->preload_ok = false;
}
if (no_ass)
fill_plaintext(sd, pts);
int changed;
ASS_Image *imgs = ass_render_frame(renderer, track, ts, &changed);
mp_ass_packer_pack(ctx->packer, &imgs, 1, changed, format, res);
done:
// mangle_colors() modifies the color field, so copy the thing _before_.
res = sub_bitmaps_copy(&ctx->copy_cache, res);
if (!converted && res)
mangle_colors(sd, res);
return res;
}
struct buf {
char *start;
int size;
int len;
};
static void append(struct buf *b, char c)
{
if (b->len < b->size) {
b->start[b->len] = c;
b->len++;
}
}
static void ass_to_plaintext(struct buf *b, const char *in)
{
bool in_tag = false;
const char *open_tag_pos = NULL;
bool in_drawing = false;
while (*in) {
if (in_tag) {
if (in[0] == '}') {
in += 1;
in_tag = false;
} else if (in[0] == '\\' && in[1] == 'p') {
in += 2;
// Skip text between \pN and \p0 tags. A \p without a number
// is the same as \p0, and leading 0s are also allowed.
in_drawing = false;
while (in[0] >= '0' && in[0] <= '9') {
if (in[0] != '0')
in_drawing = true;
in += 1;
}
} else {
in += 1;
}
} else {
if (in[0] == '\\' && (in[1] == 'N' || in[1] == 'n')) {
in += 2;
append(b, '\n');
} else if (in[0] == '\\' && in[1] == 'h') {
in += 2;
append(b, ' ');
} else if (in[0] == '{') {
open_tag_pos = in;
in += 1;
in_tag = true;
} else {
if (!in_drawing)
append(b, in[0]);
in += 1;
}
}
}
// A '{' without a closing '}' is always visible.
if (in_tag) {
while (*open_tag_pos)
append(b, *open_tag_pos++);
}
}
// Empty string counts as whitespace. Reads s[len-1] even if there are \0s.
static bool is_whitespace_only(char *s, int len)
{
for (int n = 0; n < len; n++) {
if (s[n] != ' ' && s[n] != '\t')
return false;
}
return true;
}
static char *get_text_buf(struct sd *sd, double pts, enum sd_text_type type)
{
struct sd_ass_priv *ctx = sd->priv;
ASS_Track *track = ctx->ass_track;
if (pts == MP_NOPTS_VALUE)
return NULL;
long long ipts = find_timestamp(sd, pts);
struct buf b = {ctx->last_text, sizeof(ctx->last_text) - 1};
for (int i = 0; i < track->n_events; ++i) {
ASS_Event *event = track->events + i;
if (ipts >= event->Start && ipts < event->Start + event->Duration) {
if (event->Text) {
int start = b.len;
if (type == SD_TEXT_TYPE_PLAIN) {
ass_to_plaintext(&b, event->Text);
} else {
char *t = event->Text;
while (*t)
append(&b, *t++);
}
if (is_whitespace_only(&b.start[start], b.len - start)) {
b.len = start;
} else {
append(&b, '\n');
}
}
}
}
b.start[b.len] = '\0';
if (b.len > 0 && b.start[b.len - 1] == '\n')
b.start[b.len - 1] = '\0';
return ctx->last_text;
}
static char *get_text(struct sd *sd, double pts, enum sd_text_type type)
{
return talloc_strdup(NULL, get_text_buf(sd, pts, type));
}
static struct sd_times get_times(struct sd *sd, double pts)
{
struct sd_ass_priv *ctx = sd->priv;
ASS_Track *track = ctx->ass_track;
struct sd_times res = { .start = MP_NOPTS_VALUE, .end = MP_NOPTS_VALUE };
if (pts == MP_NOPTS_VALUE)
return res;
long long ipts = find_timestamp(sd, pts);
for (int i = 0; i < track->n_events; ++i) {
ASS_Event *event = track->events + i;
if (ipts >= event->Start && ipts < event->Start + event->Duration) {
double start = event->Start / 1000.0;
double end = event->Duration == UNKNOWN_DURATION ?
MP_NOPTS_VALUE : (event->Start + event->Duration) / 1000.0;
if (res.start == MP_NOPTS_VALUE || res.start > start)
res.start = start;
if (res.end == MP_NOPTS_VALUE || res.end < end)
res.end = end;
}
}
return res;
}
static void fill_plaintext(struct sd *sd, double pts)
{
struct sd_ass_priv *ctx = sd->priv;
ASS_Track *track = ctx->shadow_track;
ass_flush_events(track);
char *text = get_text_buf(sd, pts, SD_TEXT_TYPE_PLAIN);
if (!text)
return;
bstr dst = {0};
if (ctx->on_top)
bstr_xappend(NULL, &dst, bstr0("{\\a6}"));
while (*text) {
if (*text == '{')
bstr_xappend(NULL, &dst, bstr0("\\"));
bstr_xappend(NULL, &dst, (bstr){text, 1});
// Break ASS escapes with U+2060 WORD JOINER
if (*text == '\\')
mp_append_utf8_bstr(NULL, &dst, 0x2060);
text++;
}
if (!dst.start)
return;
int n = ass_alloc_event(track);
ASS_Event *event = track->events + n;
event->Start = 0;
event->Duration = INT_MAX;
event->Style = track->default_style;
event->Text = strdup(dst.start);
talloc_free(dst.start);
}
static void reset(struct sd *sd)
{
struct sd_ass_priv *ctx = sd->priv;
if (sd->opts->sub_clear_on_seek || ctx->duration_unknown || ctx->clear_once) {
ass_flush_events(ctx->ass_track);
ctx->num_seen_packets = 0;
sd->preload_ok = false;
ctx->clear_once = false;
}
if (ctx->converter)
lavc_conv_reset(ctx->converter);
}
static void uninit(struct sd *sd)
{
struct sd_ass_priv *ctx = sd->priv;
filters_destroy(sd);
if (ctx->converter)
lavc_conv_uninit(ctx->converter);
assobjects_destroy(sd);
talloc_free(ctx->copy_cache);
}
static int control(struct sd *sd, enum sd_ctrl cmd, void *arg)
{
struct sd_ass_priv *ctx = sd->priv;
switch (cmd) {
case SD_CTRL_SUB_STEP: {
double *a = arg;
long long ts = llrint(a[0] * 1000.0);
long long res = ass_step_sub(ctx->ass_track, ts, a[1]);
if (!res)
return false;
// Try to account for overlapping durations
a[0] += res / 1000.0 + SUB_SEEK_OFFSET;
return true;
}
case SD_CTRL_SET_VIDEO_PARAMS:
ctx->video_params = *(struct mp_image_params *)arg;
return CONTROL_OK;
case SD_CTRL_SET_TOP:
ctx->on_top = *(bool *)arg;
return CONTROL_OK;
case SD_CTRL_UPDATE_OPTS: {
int flags = (uintptr_t)arg;
if (flags & UPDATE_SUB_FILT) {
filters_destroy(sd);
filters_init(sd);
ctx->clear_once = true; // allow reloading on seeks
reset(sd);
}
if (flags & UPDATE_SUB_HARD) {
// ass_track will be recreated, so clear duplicate cache
ctx->clear_once = true;
reset(sd);
assobjects_destroy(sd);
assobjects_init(sd);
}
ctx->ass_configured = false; // ass always needs to be reconfigured
return CONTROL_OK;
}
default:
return CONTROL_UNKNOWN;
}
}
const struct sd_functions sd_ass = {
.name = "ass",
.accept_packets_in_advance = true,
.init = init,
.decode = decode,
.get_bitmaps = get_bitmaps,
.get_text = get_text,
.get_times = get_times,
.control = control,
.reset = reset,
.select = enable_output,
.uninit = uninit,
};
// Disgusting hack for (xy-)vsfilter color compatibility.
static void mangle_colors(struct sd *sd, struct sub_bitmaps *parts)
{
struct mp_subtitle_opts *opts = sd->opts;
struct sd_ass_priv *ctx = sd->priv;
enum mp_csp csp = 0;
enum mp_csp_levels levels = 0;
if (opts->ass_vsfilter_color_compat == 0) // "no"
return;
bool force_601 = opts->ass_vsfilter_color_compat == 3;
ASS_Track *track = ctx->ass_track;
static const int ass_csp[] = {
[YCBCR_BT601_TV] = MP_CSP_BT_601,
[YCBCR_BT601_PC] = MP_CSP_BT_601,
[YCBCR_BT709_TV] = MP_CSP_BT_709,
[YCBCR_BT709_PC] = MP_CSP_BT_709,
[YCBCR_SMPTE240M_TV] = MP_CSP_SMPTE_240M,
[YCBCR_SMPTE240M_PC] = MP_CSP_SMPTE_240M,
};
static const int ass_levels[] = {
[YCBCR_BT601_TV] = MP_CSP_LEVELS_TV,
[YCBCR_BT601_PC] = MP_CSP_LEVELS_PC,
[YCBCR_BT709_TV] = MP_CSP_LEVELS_TV,
[YCBCR_BT709_PC] = MP_CSP_LEVELS_PC,
[YCBCR_SMPTE240M_TV] = MP_CSP_LEVELS_TV,
[YCBCR_SMPTE240M_PC] = MP_CSP_LEVELS_PC,
};
int trackcsp = track->YCbCrMatrix;
if (force_601)
trackcsp = YCBCR_BT601_TV;
// NONE is a bit random, but the intention is: don't modify colors.
if (trackcsp == YCBCR_NONE)
return;
if (trackcsp < sizeof(ass_csp) / sizeof(ass_csp[0]))
csp = ass_csp[trackcsp];
if (trackcsp < sizeof(ass_levels) / sizeof(ass_levels[0]))
levels = ass_levels[trackcsp];
if (trackcsp == YCBCR_DEFAULT) {
csp = MP_CSP_BT_601;
levels = MP_CSP_LEVELS_TV;
}
// Unknown colorspace (either YCBCR_UNKNOWN, or a valid value unknown to us)
if (!csp || !levels)
return;
struct mp_image_params params = ctx->video_params;
if (force_601) {
params.color = (struct mp_colorspace){
.space = MP_CSP_BT_709,
.levels = MP_CSP_LEVELS_TV,
};
}
if ((csp == params.color.space && levels == params.color.levels) ||
params.color.space == MP_CSP_RGB) // Even VSFilter doesn't mangle on RGB video
return;
bool basic_conv = params.color.space == MP_CSP_BT_709 &&
params.color.levels == MP_CSP_LEVELS_TV &&
csp == MP_CSP_BT_601 &&
levels == MP_CSP_LEVELS_TV;
// With "basic", only do as much as needed for basic compatibility.
if (opts->ass_vsfilter_color_compat == 1 && !basic_conv)
return;
if (params.color.space != ctx->last_params.color.space ||
params.color.levels != ctx->last_params.color.levels)
{
int msgl = basic_conv ? MSGL_V : MSGL_WARN;
ctx->last_params = params;
MP_MSG(sd, msgl, "mangling colors like vsfilter: "
"RGB -> %s %s -> %s %s -> RGB\n",
m_opt_choice_str(mp_csp_names, csp),
m_opt_choice_str(mp_csp_levels_names, levels),
m_opt_choice_str(mp_csp_names, params.color.space),
m_opt_choice_str(mp_csp_names, params.color.levels));
}
// Conversion that VSFilter would use
struct mp_csp_params vs_params = MP_CSP_PARAMS_DEFAULTS;
vs_params.color.space = csp;
vs_params.color.levels = levels;
struct mp_cmat vs_yuv2rgb, vs_rgb2yuv;
mp_get_csp_matrix(&vs_params, &vs_yuv2rgb);
mp_invert_cmat(&vs_rgb2yuv, &vs_yuv2rgb);
// Proper conversion to RGB
struct mp_csp_params rgb_params = MP_CSP_PARAMS_DEFAULTS;
rgb_params.color = params.color;
struct mp_cmat vs2rgb;
mp_get_csp_matrix(&rgb_params, &vs2rgb);
for (int n = 0; n < parts->num_parts; n++) {
struct sub_bitmap *sb = &parts->parts[n];
uint32_t color = sb->libass.color;
int r = (color >> 24u) & 0xff;
int g = (color >> 16u) & 0xff;
int b = (color >> 8u) & 0xff;
int a = 0xff - (color & 0xff);
int rgb[3] = {r, g, b}, yuv[3];
mp_map_fixp_color(&vs_rgb2yuv, 8, rgb, 8, yuv);
mp_map_fixp_color(&vs2rgb, 8, yuv, 8, rgb);
sb->libass.color = MP_ASS_RGBA(rgb[0], rgb[1], rgb[2], a);
}
}
int sd_ass_fmt_offset(const char *evt_fmt)
{
// "Text" is always last (as it's arbitrary content in buf), e.g. format:
// "Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text"
int n = 0;
while (evt_fmt && (evt_fmt = strchr(evt_fmt, ',')))
evt_fmt++, n++;
return n-1; // buffer is without the format's Start/End, with ReadOrder
}
bstr sd_ass_pkt_text(struct sd_filter *ft, struct demux_packet *pkt, int offset)
{
// e.g. pkt->buffer ("4" is ReadOrder): "4,0,Default,,0,0,0,,fifth line"
bstr txt = {(char *)pkt->buffer, pkt->len}, t0 = txt;
while (offset-- > 0) {
int n = bstrchr(txt, ',');
if (n < 0) { // shouldn't happen
MP_WARN(ft, "Malformed event '%.*s'\n", BSTR_P(t0));
return (bstr){NULL, 0};
}
txt = bstr_cut(txt, n+1);
}
return txt;
}
bstr sd_ass_to_plaintext(char *out, size_t out_siz, const char *in)
{
struct buf b = {out, out_siz, 0};
ass_to_plaintext(&b, in);
if (b.len < out_siz)
out[b.len] = 0;
return (bstr){out, b.len};
}
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