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mpv/sub/sd_ass.c
wm4 de6eace6e9 command: sub_seek: avoid getting stuck 
First, don't try to seek if the result is 0 (i.e. nothing found, or
subtitle event happens to be exactly on spot).

Second, since we never can make sure that we actually seek to the exact
subtitle PTS (seeking "snaps" to video PTS), offset the seek by 10ms.
Since most subtitle events are longer than 10ms, this should work fine.
2013-10-07 17:21:53 +02:00

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/*
* 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 <assert.h>
#include <string.h>
#include <libavutil/common.h>
#include <ass/ass.h>
#include "talloc.h"
#include "mpvcore/options.h"
#include "mpvcore/mp_common.h"
#include "mpvcore/mp_msg.h"
#include "video/csputils.h"
#include "video/mp_image.h"
#include "sub.h"
#include "dec_sub.h"
#include "ass_mp.h"
#include "sd.h"
struct sd_ass_priv {
struct ass_track *ass_track;
bool is_converted;
struct sub_bitmap *parts;
bool flush_on_seek;
char last_text[500];
struct mp_image_params video_params;
struct mp_image_params last_params;
};
static void mangle_colors(struct sd *sd, struct sub_bitmaps *parts);
static bool supports_format(const char *format)
{
// ass-text is produced by converters and the subreader.c ssa parser; this
// format has ASS tags, but doesn't start with any prelude, nor does it
// have extradata.
return format && (strcmp(format, "ass") == 0 ||
strcmp(format, "ssa") == 0 ||
strcmp(format, "ass-text") == 0);
}
static int init(struct sd *sd)
{
struct MPOpts *opts = sd->opts;
if (!sd->ass_library || !sd->ass_renderer || !sd->codec)
return -1;
struct sd_ass_priv *ctx = talloc_zero(NULL, struct sd_ass_priv);
sd->priv = ctx;
ctx->is_converted = sd->converted_from != NULL;
if (sd->ass_track) {
ctx->ass_track = sd->ass_track;
} else {
ctx->ass_track = ass_new_track(sd->ass_library);
if (!ctx->is_converted)
ctx->ass_track->track_type = TRACK_TYPE_ASS;
}
if (sd->extradata) {
ass_process_codec_private(ctx->ass_track, sd->extradata,
sd->extradata_len);
}
mp_ass_add_default_styles(ctx->ass_track, opts);
return 0;
}
static void decode(struct sd *sd, struct demux_packet *packet)
{
struct sd_ass_priv *ctx = sd->priv;
ASS_Track *track = ctx->ass_track;
long long ipts = packet->pts * 1000 + 0.5;
long long iduration = packet->duration * 1000 + 0.5;
if (strcmp(sd->codec, "ass") == 0) {
ass_process_chunk(track, packet->buffer, packet->len, ipts, iduration);
return;
} else if (strcmp(sd->codec, "ssa") == 0) {
// broken ffmpeg ASS packet format
ctx->flush_on_seek = true;
ass_process_data(track, packet->buffer, packet->len);
return;
}
// plaintext subs
if (packet->pts == MP_NOPTS_VALUE) {
mp_msg(MSGT_SUBREADER, MSGL_WARN, "Subtitle without pts, ignored\n");
return;
}
if (packet->duration <= 0) {
mp_msg(MSGT_SUBREADER, MSGL_WARN, "Subtitle without duration or "
"duration set to 0 at pts %f, ignored\n", packet->pts);
return;
}
unsigned char *text = packet->buffer;
if (!sd->no_remove_duplicates) {
for (int i = 0; i < track->n_events; i++) {
if (track->events[i].Start == ipts
&& (track->events[i].Duration == iduration)
&& strcmp(track->events[i].Text, text) == 0)
return; // We've already added this subtitle
}
}
int eid = ass_alloc_event(track);
ASS_Event *event = track->events + eid;
event->Start = ipts;
event->Duration = iduration;
event->Style = track->default_style;
event->Text = strdup(text);
}
static void get_bitmaps(struct sd *sd, struct mp_osd_res dim, double pts,
struct sub_bitmaps *res)
{
struct sd_ass_priv *ctx = sd->priv;
struct MPOpts *opts = sd->opts;
if (pts == MP_NOPTS_VALUE || !sd->ass_renderer)
return;
ASS_Renderer *renderer = sd->ass_renderer;
double scale = dim.display_par;
if (!ctx->is_converted && (!opts->ass_style_override ||
opts->ass_vsfilter_aspect_compat))
{
scale = scale * dim.video_par;
}
mp_ass_configure(renderer, opts, &dim);
ass_set_aspect_ratio(renderer, scale, 1);
#if LIBASS_VERSION >= 0x01020000
if (!ctx->is_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);
}
#endif
mp_ass_render_frame(renderer, ctx->ass_track, pts * 1000 + .5,
&ctx->parts, res);
talloc_steal(ctx, ctx->parts);
if (!ctx->is_converted)
mangle_colors(sd, 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;
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
if (in[0] == '0') {
in_drawing = false;
} else if (in[0] >= '1' && in[0] <= '9') {
in_drawing = true;
}
} 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] == '{') {
in += 1;
in_tag = true;
} else {
if (!in_drawing)
append(b, in[0]);
in += 1;
}
}
}
}
// 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(struct sd *sd, double pts)
{
struct sd_ass_priv *ctx = sd->priv;
ASS_Track *track = ctx->ass_track;
if (pts == MP_NOPTS_VALUE)
return NULL;
long long ipts = pts * 1000 + 0.5;
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;
ass_to_plaintext(&b, event->Text);
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 void fix_events(struct sd *sd)
{
struct sd_ass_priv *ctx = sd->priv;
ctx->flush_on_seek = false;
}
static void reset(struct sd *sd)
{
struct sd_ass_priv *ctx = sd->priv;
if (ctx->flush_on_seek)
ass_flush_events(ctx->ass_track);
ctx->flush_on_seek = false;
}
static void uninit(struct sd *sd)
{
struct sd_ass_priv *ctx = sd->priv;
if (sd->ass_track != ctx->ass_track)
ass_free_track(ctx->ass_track);
talloc_free(ctx);
}
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 res = ass_step_sub(ctx->ass_track, a[0] * 1000 + 0.5, a[1]);
if (!res)
return false;
a[0] = res / 1000.0;
return true;
case SD_CTRL_SET_VIDEO_PARAMS:
ctx->video_params = *(struct mp_image_params *)arg;
return CONTROL_OK;
}
default:
return CONTROL_UNKNOWN;
}
}
const struct sd_functions sd_ass = {
.name = "ass",
.accept_packets_in_advance = true,
.supports_format = supports_format,
.init = init,
.decode = decode,
.get_bitmaps = get_bitmaps,
.get_text = get_text,
.fix_events = fix_events,
.control = control,
.reset = reset,
.uninit = uninit,
};
// Disgusting hack for (xy-)vsfilter color compatibility.
static void mangle_colors(struct sd *sd, struct sub_bitmaps *parts)
{
struct MPOpts *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;
#if LIBASS_VERSION >= 0x01020000
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;
#endif
struct mp_image_params params = ctx->video_params;
if (force_601) {
params.colorspace = MP_CSP_BT_709;
params.colorlevels = MP_CSP_LEVELS_TV;
}
if (csp == params.colorspace && levels == params.colorlevels)
return;
bool basic_conv = params.colorspace == MP_CSP_BT_709 &&
params.colorlevels == 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.colorspace != ctx->last_params.colorspace ||
params.colorlevels != ctx->last_params.colorlevels)
{
int msgl = basic_conv ? MSGL_V : MSGL_WARN;
ctx->last_params = params;
mp_msg(MSGT_SUBREADER, msgl, "[sd_ass] mangling colors like vsfilter: "
"RGB -> %s %s -> %s %s -> RGB\n", mp_csp_names[csp],
mp_csp_levels_names[levels], mp_csp_names[params.colorspace],
mp_csp_levels_names[params.colorlevels]);
}
// Conversion that VSFilter would use
struct mp_csp_params vs_params = MP_CSP_PARAMS_DEFAULTS;
vs_params.colorspace.format = csp;
vs_params.colorspace.levels_in = levels;
vs_params.int_bits_in = 8;
vs_params.int_bits_out = 8;
float vs_yuv2rgb[3][4], vs_rgb2yuv[3][4];
mp_get_yuv2rgb_coeffs(&vs_params, vs_yuv2rgb);
mp_invert_yuv2rgb(vs_rgb2yuv, vs_yuv2rgb);
// Proper conversion to RGB
struct mp_csp_params rgb_params = MP_CSP_PARAMS_DEFAULTS;
rgb_params.colorspace.format = params.colorspace;
rgb_params.colorspace.levels_in = params.colorlevels;
rgb_params.int_bits_in = 8;
rgb_params.int_bits_out = 8;
float vs2rgb[3][4];
mp_get_yuv2rgb_coeffs(&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 = color & 0xff;
int c[3] = {r, g, b};
mp_map_int_color(vs_rgb2yuv, 8, c);
mp_map_int_color(vs2rgb, 8, c);
sb->libass.color = (c[0] << 24u) | (c[1] << 16) | (c[2] << 8) | a;
}
}
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