mpv/demux/demux_disc.c

383 lines
12 KiB
C

/*
* 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 <string.h>
#include <math.h>
#include <assert.h>
#include "common/common.h"
#include "common/msg.h"
#include "stream/stream.h"
#include "video/mp_image.h"
#include "demux.h"
#include "stheader.h"
#include "video/csputils.h"
struct priv {
struct demuxer *slave;
// streams[slave_stream_index] == our_stream
struct sh_stream **streams;
int num_streams;
// This contains each DVD sub stream, or NULL. Needed because DVD packets
// can come arbitrarily late in the MPEG stream, so the slave demuxer
// might add the streams only later.
struct sh_stream *dvd_subs[32];
// Used to rewrite the raw MPEG timestamps to playback time.
double base_time; // playback display start time of current segment
double base_dts; // packet DTS that maps to base_time
double last_dts; // DTS of previously demuxed packet
bool seek_reinit; // needs reinit after seek
bool is_dvd, is_cdda;
};
// If the timestamp difference between subsequent packets is this big, assume
// a reset. It should be big enough to account for 1. low video framerates and
// large audio frames, and 2. bad interleaving.
#define DTS_RESET_THRESHOLD 5.0
static void reselect_streams(demuxer_t *demuxer)
{
struct priv *p = demuxer->priv;
int num_slave = demux_get_num_stream(p->slave);
for (int n = 0; n < MPMIN(num_slave, p->num_streams); n++) {
if (p->streams[n]) {
demuxer_select_track(p->slave, demux_get_stream(p->slave, n),
MP_NOPTS_VALUE, demux_stream_is_selected(p->streams[n]));
}
}
}
static void get_disc_lang(struct stream *stream, struct sh_stream *sh, bool dvd)
{
struct stream_lang_req req = {.type = sh->type, .id = sh->demuxer_id};
if (dvd && sh->type == STREAM_SUB)
req.id = req.id & 0x1F; // mpeg ID to index
stream_control(stream, STREAM_CTRL_GET_LANG, &req);
if (req.name[0])
sh->lang = talloc_strdup(sh, req.name);
}
static void add_dvd_streams(demuxer_t *demuxer)
{
struct priv *p = demuxer->priv;
struct stream *stream = demuxer->stream;
if (!p->is_dvd)
return;
struct stream_dvd_info_req info;
if (stream_control(stream, STREAM_CTRL_GET_DVD_INFO, &info) > 0) {
for (int n = 0; n < MPMIN(32, info.num_subs); n++) {
struct sh_stream *sh = demux_alloc_sh_stream(STREAM_SUB);
sh->demuxer_id = n + 0x20;
sh->codec->codec = "dvd_subtitle";
get_disc_lang(stream, sh, true);
// p->streams _must_ match with p->slave->streams, so we can't add
// it yet - it has to be done when the real stream appears, which
// could be right on start, or any time later.
p->dvd_subs[n] = sh;
// emulate the extradata
struct mp_csp_params csp = MP_CSP_PARAMS_DEFAULTS;
struct mp_cmat cmatrix;
mp_get_csp_matrix(&csp, &cmatrix);
char *s = talloc_strdup(sh, "");
s = talloc_asprintf_append(s, "palette: ");
for (int i = 0; i < 16; i++) {
int color = info.palette[i];
int y[3] = {(color >> 16) & 0xff, (color >> 8) & 0xff, color & 0xff};
int c[3];
mp_map_fixp_color(&cmatrix, 8, y, 8, c);
color = (c[2] << 16) | (c[1] << 8) | c[0];
if (i != 0)
s = talloc_asprintf_append(s, ", ");
s = talloc_asprintf_append(s, "%06x", color);
}
s = talloc_asprintf_append(s, "\n");
sh->codec->extradata = s;
sh->codec->extradata_size = strlen(s);
demux_add_sh_stream(demuxer, sh);
}
}
}
static void add_streams(demuxer_t *demuxer)
{
struct priv *p = demuxer->priv;
for (int n = p->num_streams; n < demux_get_num_stream(p->slave); n++) {
struct sh_stream *src = demux_get_stream(p->slave, n);
if (src->type == STREAM_SUB) {
struct sh_stream *sub = NULL;
if (src->demuxer_id >= 0x20 && src->demuxer_id <= 0x3F)
sub = p->dvd_subs[src->demuxer_id - 0x20];
if (sub) {
assert(p->num_streams == n); // directly mapped
MP_TARRAY_APPEND(p, p->streams, p->num_streams, sub);
continue;
}
}
struct sh_stream *sh = demux_alloc_sh_stream(src->type);
assert(p->num_streams == n); // directly mapped
MP_TARRAY_APPEND(p, p->streams, p->num_streams, sh);
// Copy all stream fields that might be relevant
*sh->codec = *src->codec;
sh->demuxer_id = src->demuxer_id;
if (src->type == STREAM_VIDEO) {
double ar;
if (stream_control(demuxer->stream, STREAM_CTRL_GET_ASPECT_RATIO, &ar)
== STREAM_OK)
{
struct mp_image_params f = {.w = src->codec->disp_w,
.h = src->codec->disp_h};
mp_image_params_set_dsize(&f, 1728 * ar, 1728);
sh->codec->par_w = f.p_w;
sh->codec->par_h = f.p_h;
}
}
get_disc_lang(demuxer->stream, sh, p->is_dvd);
demux_add_sh_stream(demuxer, sh);
}
reselect_streams(demuxer);
}
static void d_seek(demuxer_t *demuxer, double seek_pts, int flags)
{
struct priv *p = demuxer->priv;
if (p->is_cdda) {
demux_seek(p->slave, seek_pts, flags);
return;
}
if (flags & SEEK_FACTOR) {
double tmp = 0;
stream_control(demuxer->stream, STREAM_CTRL_GET_TIME_LENGTH, &tmp);
seek_pts *= tmp;
}
MP_VERBOSE(demuxer, "seek to: %f\n", seek_pts);
double seek_arg[] = {seek_pts, flags};
stream_control(demuxer->stream, STREAM_CTRL_SEEK_TO_TIME, seek_arg);
demux_control(p->slave, DEMUXER_CTRL_RESYNC, NULL);
p->seek_reinit = true;
}
static void reset_pts(demuxer_t *demuxer)
{
struct priv *p = demuxer->priv;
double base;
if (stream_control(demuxer->stream, STREAM_CTRL_GET_CURRENT_TIME, &base) < 1)
base = 0;
MP_VERBOSE(demuxer, "reset to time: %f\n", base);
p->base_dts = p->last_dts = MP_NOPTS_VALUE;
p->base_time = base;
p->seek_reinit = false;
}
static int d_fill_buffer(demuxer_t *demuxer)
{
struct priv *p = demuxer->priv;
struct demux_packet *pkt = demux_read_any_packet(p->slave);
if (!pkt)
return 0;
demux_update(p->slave);
if (p->seek_reinit)
reset_pts(demuxer);
add_streams(demuxer);
if (pkt->stream >= p->num_streams) { // out of memory?
talloc_free(pkt);
return 0;
}
struct sh_stream *sh = p->streams[pkt->stream];
if (!demux_stream_is_selected(sh)) {
talloc_free(pkt);
return 1;
}
if (p->is_cdda) {
demux_add_packet(sh, pkt);
return 1;
}
MP_TRACE(demuxer, "ipts: %d %f %f\n", sh->type, pkt->pts, pkt->dts);
if (sh->type == STREAM_SUB) {
if (p->base_dts == MP_NOPTS_VALUE)
MP_WARN(demuxer, "subtitle packet along PTS reset\n");
} else if (pkt->dts != MP_NOPTS_VALUE) {
// Use the very first DTS to rebase the start time of the MPEG stream
// to the playback time.
if (p->base_dts == MP_NOPTS_VALUE)
p->base_dts = pkt->dts;
if (p->last_dts == MP_NOPTS_VALUE)
p->last_dts = pkt->dts;
if (fabs(p->last_dts - pkt->dts) >= DTS_RESET_THRESHOLD) {
MP_WARN(demuxer, "PTS discontinuity: %f->%f\n", p->last_dts, pkt->dts);
p->base_time += p->last_dts - p->base_dts;
p->base_dts = pkt->dts - pkt->duration;
}
p->last_dts = pkt->dts;
}
if (p->base_dts != MP_NOPTS_VALUE) {
double delta = -p->base_dts + p->base_time;
if (pkt->pts != MP_NOPTS_VALUE)
pkt->pts += delta;
if (pkt->dts != MP_NOPTS_VALUE)
pkt->dts += delta;
}
MP_TRACE(demuxer, "opts: %d %f %f\n", sh->type, pkt->pts, pkt->dts);
demux_add_packet(sh, pkt);
return 1;
}
static void add_stream_chapters(struct demuxer *demuxer)
{
int num = 0;
if (stream_control(demuxer->stream, STREAM_CTRL_GET_NUM_CHAPTERS, &num) < 1)
return;
for (int n = 0; n < num; n++) {
double p = n;
if (stream_control(demuxer->stream, STREAM_CTRL_GET_CHAPTER_TIME, &p) < 1)
continue;
demuxer_add_chapter(demuxer, "", p, 0);
}
}
static int d_open(demuxer_t *demuxer, enum demux_check check)
{
struct priv *p = demuxer->priv = talloc_zero(demuxer, struct priv);
if (check != DEMUX_CHECK_FORCE)
return -1;
struct demuxer_params params = {
.force_format = "+lavf",
.does_not_own_stream = true,
};
struct stream *cur = demuxer->stream;
const char *sname = "";
while (cur) {
if (cur->info)
sname = cur->info->name;
cur = cur->underlying; // down the caching chain
}
p->is_cdda = strcmp(sname, "cdda") == 0;
p->is_dvd = strcmp(sname, "dvd") == 0 ||
strcmp(sname, "ifo") == 0 ||
strcmp(sname, "dvdnav") == 0 ||
strcmp(sname, "ifo_dvdnav") == 0;
if (p->is_cdda)
params.force_format = "+rawaudio";
char *t = NULL;
stream_control(demuxer->stream, STREAM_CTRL_GET_DISC_NAME, &t);
if (t) {
mp_tags_set_str(demuxer->metadata, "TITLE", t);
talloc_free(t);
}
// Initialize the playback time. We need to read _some_ data to get the
// correct stream-layer time (at least with libdvdnav).
stream_peek(demuxer->stream, 1);
reset_pts(demuxer);
p->slave = demux_open(demuxer->stream, &params, demuxer->global);
if (!p->slave)
return -1;
// So that we don't miss initial packets of delayed subtitle streams.
demux_set_stream_autoselect(p->slave, true);
// With cache enabled, the stream can be seekable. This causes demux_lavf.c
// (actually libavformat/mpegts.c) to seek sometimes when reading a packet.
// It does this to seek back a bit in case the current file position points
// into the middle of a packet.
if (!p->is_cdda) {
demuxer->stream->seekable = false;
// Can be seekable even if the stream isn't.
demuxer->seekable = true;
}
add_dvd_streams(demuxer);
add_streams(demuxer);
add_stream_chapters(demuxer);
double len;
if (stream_control(demuxer->stream, STREAM_CTRL_GET_TIME_LENGTH, &len) >= 1)
demuxer->duration = len;
demuxer->extended_ctrls = true;
return 0;
}
static void d_close(demuxer_t *demuxer)
{
struct priv *p = demuxer->priv;
demux_free(p->slave);
}
static int d_control(demuxer_t *demuxer, int cmd, void *arg)
{
struct priv *p = demuxer->priv;
switch (cmd) {
case DEMUXER_CTRL_RESYNC:
demux_flush(p->slave);
break; // relay to slave demuxer
case DEMUXER_CTRL_SWITCHED_TRACKS:
reselect_streams(demuxer);
return CONTROL_OK;
}
return demux_control(p->slave, cmd, arg);
}
const demuxer_desc_t demuxer_desc_disc = {
.name = "disc",
.desc = "CD/DVD/BD wrapper",
.fill_buffer = d_fill_buffer,
.open = d_open,
.close = d_close,
.seek = d_seek,
.control = d_control,
};