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ffmpeg/libavformat/dvdvideodec.c
Marth64 8707c8660d avformat/dvdvideodec: implement seeking 
Player applications can now enjoy seeking while playing back
a title. Accuracy is at the mercy of what libdvdnav exposes,
which is currently dvdnav_time_search().

Signed-off-by: Marth64 <marth64@proxyid.net>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
2024-09-15 13:53:00 +02:00

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/*
* DVD-Video demuxer, powered by libdvdnav and libdvdread
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* See doc/demuxers.texi for a high-level overview.
*
* The tactical approach is as follows:
* 1) Open the volume with dvdread
* 2) Analyze the user-requested title and PGC coordinates in the IFO structures
* 3) Request playback at the coordinates and chosen angle with dvdnav
* 5) Begin the playback (reading and demuxing) of MPEG-PS blocks
* 6) End playback if navigation goes backwards, to a menu, or a different PGC or angle
* 7) Close the dvdnav VM, and free dvdread's IFO structures
*/
#include <inttypes.h>
#include <dvdnav/dvdnav.h>
#include <dvdread/dvd_reader.h>
#include <dvdread/ifo_read.h>
#include <dvdread/ifo_types.h>
#include <dvdread/nav_read.h>
#include "libavutil/avstring.h"
#include "libavutil/avutil.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "libavutil/time.h"
#include "libavutil/timestamp.h"
#include "avformat.h"
#include "avio_internal.h"
#include "avlanguage.h"
#include "demux.h"
#include "dvdclut.h"
#include "internal.h"
#include "url.h"
#define DVDVIDEO_MAX_PS_SEARCH_BLOCKS 128
#define DVDVIDEO_BLOCK_SIZE 2048
#define DVDVIDEO_TIME_BASE_Q (AVRational) { 1, 90000 }
#define DVDVIDEO_PTS_WRAP_BITS 64 /* VOBUs use 32 (PES allows 33) */
#define DVDVIDEO_LIBDVDX_LOG_BUFFER_SIZE 1024
#define PCI_START_BYTE 45 /* complement dvdread's DSI_START_BYTE */
static const uint8_t dvdvideo_nav_header[4] = { 0x00, 0x00, 0x01, 0xBF };
enum DVDVideoSubpictureViewport {
DVDVIDEO_SUBP_VIEWPORT_FULLSCREEN,
DVDVIDEO_SUBP_VIEWPORT_WIDESCREEN,
DVDVIDEO_SUBP_VIEWPORT_LETTERBOX,
DVDVIDEO_SUBP_VIEWPORT_PANSCAN
};
static const char dvdvideo_subp_viewport_labels[4][13] = {
"Fullscreen", "Widescreen", "Letterbox", "Pan and Scan"
};
typedef struct DVDVideoVTSVideoStreamEntry {
int startcode;
enum AVCodecID codec_id;
int width;
int height;
AVRational dar;
AVRational framerate;
int has_cc;
} DVDVideoVTSVideoStreamEntry;
typedef struct DVDVideoPGCAudioStreamEntry {
int startcode;
enum AVCodecID codec_id;
int sample_fmt;
int sample_rate;
int bit_depth;
int nb_channels;
AVChannelLayout ch_layout;
int disposition;
const char *lang_iso;
} DVDVideoPGCAudioStreamEntry;
typedef struct DVDVideoPGCSubtitleStreamEntry {
int startcode;
enum DVDVideoSubpictureViewport viewport;
int disposition;
uint32_t clut[FF_DVDCLUT_CLUT_LEN];
const char *lang_iso;
} DVDVideoPGCSubtitleStreamEntry;
typedef struct DVDVideoPlaybackState {
int celln; /* ID of the active cell */
int entry_pgn; /* ID of the PG we are starting in */
int in_pgc; /* if our navigator is in the PGC */
int in_ps; /* if our navigator is in the program stream */
int in_vts; /* if our navigator is in the VTS */
int is_seeking; /* relax navigation path while seeking */
int64_t nav_pts; /* PTS according to IFO, not frame-accurate */
uint64_t pgc_duration_est; /* estimated duration as reported by IFO */
uint64_t pgc_elapsed; /* the elapsed time of the PGC, cell-relative */
int pgc_nb_pg_est; /* number of PGs as reported by IFOs */
int pgcn; /* ID of the PGC we are playing */
int pgn; /* ID of the PG we are in now */
int ptt; /* ID of the chapter we are in now */
int64_t ts_offset; /* PTS discontinuity offset (ex. VOB change) */
uint32_t vobu_duration; /* duration of the current VOBU */
uint32_t vobu_e_ptm; /* end PTM of the current VOBU */
int vtsn; /* ID of the active VTS (video title set) */
uint64_t *pgc_pg_times_est; /* PG start times as reported by IFO */
pgc_t *pgc; /* handle to the active PGC */
dvdnav_t *dvdnav; /* handle to the dvdnav VM */
/* the following fields are only used for menu playback */
int celln_start; /* starting cell number */
int celln_end; /* ending cell number */
int sector_offset; /* current sector relative to the current VOB */
uint32_t sector_end; /* end sector relative to the current VOBU */
uint32_t vobu_next; /* the next VOBU pointer */
uint32_t vobu_remaining; /* remaining blocks for current VOBU */
dvd_file_t *vob_file; /* handle to the menu VOB (VMG or VTS) */
} DVDVideoPlaybackState;
typedef struct DVDVideoDemuxContext {
const AVClass *class;
/* options */
int opt_angle; /* the user-provided angle number (1-indexed) */
int opt_chapter_end; /* the user-provided exit PTT (0 for last) */
int opt_chapter_start; /* the user-provided entry PTT (1-indexed) */
int opt_menu; /* demux menu domain instead of title domain */
int opt_menu_lu; /* the menu language unit (logical grouping) */
int opt_menu_vts; /* the menu VTS, or 0 for VMG (main menu) */
int opt_pg; /* the user-provided PG number (1-indexed) */
int opt_pgc; /* the user-provided PGC number (1-indexed) */
int opt_preindex; /* pre-indexing mode (2-pass read) */
int opt_region; /* the user-provided region digit */
int opt_title; /* the user-provided title number (1-indexed) */
int opt_trim; /* trim padding cells at beginning */
/* subdemux */
AVFormatContext *mpeg_ctx; /* context for inner demuxer */
uint8_t *mpeg_buf; /* buffer for inner demuxer */
FFIOContext mpeg_pb; /* buffer context for inner demuxer */
/* volume */
dvd_reader_t *dvdread; /* handle to libdvdread */
ifo_handle_t *vmg_ifo; /* handle to the VMG (VIDEO_TS.IFO) */
ifo_handle_t *vts_ifo; /* handle to the active VTS (VTS_nn_n.IFO) */
/* playback control */
int64_t first_pts; /* the PTS of the first video keyframe */
int play_end; /* signal EOF to the parent demuxer */
DVDVideoPlaybackState play_state; /* the active playback state */
int play_started; /* signal that playback has started */
int seek_warned; /* signal that we warned about seeking limits */
int segment_started; /* signal that subdemuxer is on a segment */
} DVDVideoDemuxContext;
static void dvdvideo_libdvdread_log(void *opaque, dvd_logger_level_t level,
const char *msg, va_list msg_va)
{
AVFormatContext *s = opaque;
char msg_buf[DVDVIDEO_LIBDVDX_LOG_BUFFER_SIZE];
int lavu_level = AV_LOG_DEBUG;
vsnprintf(msg_buf, sizeof(msg_buf), msg, msg_va);
if (level == DVD_LOGGER_LEVEL_ERROR)
lavu_level = AV_LOG_ERROR;
else if (level == DVD_LOGGER_LEVEL_WARN)
lavu_level = AV_LOG_WARNING;
av_log(s, lavu_level, "libdvdread: %s\n", msg_buf);
}
static void dvdvideo_libdvdnav_log(void *opaque, dvdnav_logger_level_t level,
const char *msg, va_list msg_va)
{
AVFormatContext *s = opaque;
char msg_buf[DVDVIDEO_LIBDVDX_LOG_BUFFER_SIZE];
int lavu_level = AV_LOG_DEBUG;
vsnprintf(msg_buf, sizeof(msg_buf), msg, msg_va);
if (level == DVDNAV_LOGGER_LEVEL_ERROR)
lavu_level = AV_LOG_ERROR;
/* some discs have invalid language codes set for menus, which throws noisy warnings */
else if (level == DVDNAV_LOGGER_LEVEL_WARN && !av_strstart(msg, "Language", NULL))
lavu_level = AV_LOG_WARNING;
av_log(s, lavu_level, "libdvdnav: %s\n", msg_buf);
}
static void dvdvideo_ifo_close(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
if (c->vts_ifo)
ifoClose(c->vts_ifo);
if (c->vmg_ifo)
ifoClose(c->vmg_ifo);
if (c->dvdread)
DVDClose(c->dvdread);
}
static int dvdvideo_ifo_open(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
dvd_logger_cb dvdread_log_cb;
title_info_t title_info;
dvdread_log_cb = (dvd_logger_cb) { .pf_log = dvdvideo_libdvdread_log };
c->dvdread = DVDOpen2(s, &dvdread_log_cb, s->url);
if (!c->dvdread) {
av_log(s, AV_LOG_ERROR, "Unable to open the DVD-Video structure\n");
return AVERROR_EXTERNAL;
}
if (!(c->vmg_ifo = ifoOpen(c->dvdread, 0))) {
av_log(s, AV_LOG_ERROR, "Unable to open the VMG (VIDEO_TS.IFO)\n");
return AVERROR_EXTERNAL;
}
if (c->opt_menu) {
if (c->opt_menu_vts > 0 && !(c->vts_ifo = ifoOpen(c->dvdread, c->opt_menu_vts))) {
av_log(s, AV_LOG_ERROR, "Unable to open IFO structure for VTS %d\n", c->opt_menu_vts);
return AVERROR_EXTERNAL;
}
return 0;
}
if (c->opt_title > c->vmg_ifo->tt_srpt->nr_of_srpts) {
av_log(s, AV_LOG_ERROR, "Title %d not found\n", c->opt_title);
return AVERROR_STREAM_NOT_FOUND;
}
title_info = c->vmg_ifo->tt_srpt->title[c->opt_title - 1];
if (c->opt_angle > title_info.nr_of_angles) {
av_log(s, AV_LOG_ERROR, "Angle %d not found\n", c->opt_angle);
return AVERROR_STREAM_NOT_FOUND;
}
if (title_info.nr_of_ptts < 1) {
av_log(s, AV_LOG_ERROR, "Title %d has invalid headers (no PTTs found)\n", c->opt_title);
return AVERROR_INVALIDDATA;
}
if (c->opt_chapter_start > title_info.nr_of_ptts ||
(c->opt_chapter_end > 0 && c->opt_chapter_end > title_info.nr_of_ptts)) {
av_log(s, AV_LOG_ERROR, "Chapter (PTT) range [%d, %d] is invalid\n",
c->opt_chapter_start, c->opt_chapter_end);
return AVERROR_INVALIDDATA;
}
if (!(c->vts_ifo = ifoOpen(c->dvdread, title_info.title_set_nr))) {
av_log(s, AV_LOG_ERROR, "Unable to process IFO structure for VTS %d\n",
title_info.title_set_nr);
return AVERROR_EXTERNAL;
}
if (title_info.vts_ttn < 1 ||
title_info.vts_ttn > 99 ||
title_info.vts_ttn > c->vts_ifo->vts_ptt_srpt->nr_of_srpts ||
c->vts_ifo->vtsi_mat->nr_of_vts_audio_streams > 8 ||
c->vts_ifo->vtsi_mat->nr_of_vts_subp_streams > 32) {
av_log(s, AV_LOG_ERROR, "Title %d has invalid headers in VTS\n", c->opt_title);
return AVERROR_INVALIDDATA;
}
return 0;
}
static int dvdvideo_is_cell_promising(AVFormatContext *s, pgc_t *pgc, int celln)
{
dvd_time_t cell_duration = pgc->cell_playback[celln - 1].playback_time;
return cell_duration.second >= 1 || cell_duration.minute >= 1 || cell_duration.hour >= 1;
}
static int dvdvideo_is_pgc_promising(AVFormatContext *s, pgc_t *pgc)
{
for (int i = 1; i <= pgc->nr_of_cells; i++)
if (dvdvideo_is_cell_promising(s, pgc, i))
return 1;
return 0;
}
static void dvdvideo_menu_close(AVFormatContext *s, DVDVideoPlaybackState *state)
{
if (state->vob_file)
DVDCloseFile(state->vob_file);
}
static int dvdvideo_menu_open(AVFormatContext *s, DVDVideoPlaybackState *state)
{
DVDVideoDemuxContext *c = s->priv_data;
pgci_ut_t *pgci_ut;
pgci_ut = c->opt_menu_vts ? c->vts_ifo->pgci_ut : c->vmg_ifo->pgci_ut;
if (!pgci_ut) {
av_log(s, AV_LOG_ERROR, "Invalid PGC table for menu [LU %d, PGC %d]\n",
c->opt_menu_lu, c->opt_pgc);
return AVERROR_INVALIDDATA;
}
if (c->opt_pgc < 1 ||
c->opt_menu_lu < 1 ||
c->opt_menu_lu > pgci_ut->nr_of_lus ||
c->opt_pgc > pgci_ut->lu[c->opt_menu_lu - 1].pgcit->nr_of_pgci_srp) {
av_log(s, AV_LOG_ERROR, "Menu [LU %d, PGC %d] not found\n", c->opt_menu_lu, c->opt_pgc);
return AVERROR(EINVAL);
}
/* make sure the PGC is valid */
state->pgcn = c->opt_pgc - 1;
state->pgc = pgci_ut->lu[c->opt_menu_lu - 1].pgcit->pgci_srp[c->opt_pgc - 1].pgc;
if (!state->pgc || !state->pgc->program_map || !state->pgc->cell_playback) {
av_log(s, AV_LOG_ERROR, "Invalid PGC structure for menu [LU %d, PGC %d]\n",
c->opt_menu_lu, c->opt_pgc);
return AVERROR_INVALIDDATA;
}
/* make sure the PG is valid */
state->entry_pgn = c->opt_pg;
if (state->entry_pgn < 1 || state->entry_pgn > state->pgc->nr_of_programs) {
av_log(s, AV_LOG_ERROR, "Entry PG %d not found\n", state->entry_pgn);
return AVERROR(EINVAL);
}
/* make sure the program map isn't leading us to nowhere */
state->celln_start = state->pgc->program_map[state->entry_pgn - 1];
state->celln_end = state->pgc->nr_of_cells;
state->celln = state->celln_start;
if (state->celln_start > state->pgc->nr_of_cells) {
av_log(s, AV_LOG_ERROR, "Invalid PGC structure: program map points to unknown cell\n");
return AVERROR_INVALIDDATA;
}
state->sector_end = state->pgc->cell_playback[state->celln - 1].last_sector;
state->vobu_next = state->pgc->cell_playback[state->celln - 1].first_sector;
state->sector_offset = state->vobu_next;
if (c->opt_menu_vts > 0)
state->in_vts = 1;
if (!(state->vob_file = DVDOpenFile(c->dvdread, c->opt_menu_vts, DVD_READ_MENU_VOBS))) {
av_log(s, AV_LOG_ERROR, !c->opt_menu_vts ?
"Unable to open main menu VOB (VIDEO_TS.VOB)\n" :
"Unable to open menu VOBs for VTS %d\n", c->opt_menu_vts);
return AVERROR_EXTERNAL;
}
return 0;
}
static int dvdvideo_menu_next_ps_block(AVFormatContext *s, DVDVideoPlaybackState *state,
uint8_t *buf, int buf_size,
void (*flush_cb)(AVFormatContext *s))
{
int64_t blocks_read = 0;
uint8_t read_buf[DVDVIDEO_BLOCK_SIZE] = {0};
pci_t pci = (pci_t) {0};
dsi_t dsi = (dsi_t) {0};
if (buf_size != DVDVIDEO_BLOCK_SIZE) {
av_log(s, AV_LOG_ERROR, "Invalid buffer size (expected=%d actual=%d)\n",
DVDVIDEO_BLOCK_SIZE, buf_size);
return AVERROR(EINVAL);
}
/* we were at the end of a vobu, so now go to the next one or EOF */
if (!state->vobu_remaining && state->in_pgc) {
if (state->vobu_next == SRI_END_OF_CELL) {
if (state->celln == state->celln_end && state->sector_offset > state->sector_end)
return AVERROR_EOF;
state->celln++;
state->sector_offset = state->pgc->cell_playback[state->celln - 1].first_sector;
state->sector_end = state->pgc->cell_playback[state->celln - 1].last_sector;
} else {
state->sector_offset = state->vobu_next;
}
}
/* continue reading the VOBU */
av_log(s, AV_LOG_TRACE, "reading block at offset %d\n", state->sector_offset);
blocks_read = DVDReadBlocks(state->vob_file, state->sector_offset, 1, read_buf);
if (blocks_read != 1) {
av_log(s, AV_LOG_ERROR, "Unable to read VOB block: offset=%d blocks_read=%" PRId64 "\n",
state->sector_offset, blocks_read);
return AVERROR_INVALIDDATA;
}
/* we are at the start of a VOBU, so we are expecting a NAV packet */
if (!state->vobu_remaining) {
if (!memcmp(&read_buf[PCI_START_BYTE - 4], dvdvideo_nav_header, 4) ||
!memcmp(&read_buf[DSI_START_BYTE - 4], dvdvideo_nav_header, 4) ||
read_buf[PCI_START_BYTE - 1] != 0x00 ||
read_buf[DSI_START_BYTE - 1] != 0x01) {
av_log(s, AV_LOG_ERROR, "Invalid NAV packet at offset %d: PCI or DSI header mismatch\n",
state->sector_offset);
return AVERROR_INVALIDDATA;
}
navRead_PCI(&pci, &read_buf[PCI_START_BYTE]);
navRead_DSI(&dsi, &read_buf[DSI_START_BYTE]);
if (!pci.pci_gi.vobu_s_ptm ||
!pci.pci_gi.vobu_e_ptm ||
pci.pci_gi.vobu_s_ptm > pci.pci_gi.vobu_e_ptm) {
av_log(s, AV_LOG_ERROR, "Invalid NAV packet at offset %d: PCI header is invalid\n",
state->sector_offset);
return AVERROR_INVALIDDATA;
}
state->vobu_remaining = dsi.dsi_gi.vobu_ea;
state->vobu_next = dsi.vobu_sri.next_vobu == SRI_END_OF_CELL ? SRI_END_OF_CELL :
dsi.dsi_gi.nv_pck_lbn + (dsi.vobu_sri.next_vobu & 0x7FFFFFFF);
state->sector_offset++;
if (state->in_pgc) {
if (state->vobu_e_ptm != pci.pci_gi.vobu_s_ptm) {
if (flush_cb)
flush_cb(s);
state->ts_offset += state->vobu_e_ptm - pci.pci_gi.vobu_s_ptm;
}
} else {
state->in_pgc = 1;
state->in_ps = 1;
}
state->vobu_e_ptm = pci.pci_gi.vobu_e_ptm;
av_log(s, AV_LOG_DEBUG, "NAV packet: sector=%d "
"vobu_s_ptm=%d vobu_e_ptm=%d ts_offset=%" PRId64 "\n",
dsi.dsi_gi.nv_pck_lbn,
pci.pci_gi.vobu_s_ptm, pci.pci_gi.vobu_e_ptm, state->ts_offset);
return FFERROR_REDO;
}
/* we are in the middle of a VOBU, so pass on the PS packet */
memcpy(buf, &read_buf, DVDVIDEO_BLOCK_SIZE);
state->sector_offset++;
state->vobu_remaining--;
return DVDVIDEO_BLOCK_SIZE;
}
static void dvdvideo_play_close(AVFormatContext *s, DVDVideoPlaybackState *state)
{
if (!state->dvdnav)
return;
/* not allocated by av_malloc() */
if (state->pgc_pg_times_est)
free(state->pgc_pg_times_est);
if (dvdnav_close(state->dvdnav) != DVDNAV_STATUS_OK)
av_log(s, AV_LOG_ERROR, "Unable to close dvdnav successfully, dvdnav error: %s\n",
dvdnav_err_to_string(state->dvdnav));
}
static int dvdvideo_play_open(AVFormatContext *s, DVDVideoPlaybackState *state)
{
DVDVideoDemuxContext *c = s->priv_data;
dvdnav_logger_cb dvdnav_log_cb;
dvdnav_status_t dvdnav_open_status;
int32_t disc_region_mask;
int32_t player_region_mask;
int cur_title, cur_pgcn, cur_pgn;
pgc_t *pgc;
dvdnav_log_cb = (dvdnav_logger_cb) { .pf_log = dvdvideo_libdvdnav_log };
dvdnav_open_status = dvdnav_open2(&state->dvdnav, s, &dvdnav_log_cb, s->url);
if (!state->dvdnav ||
dvdnav_open_status != DVDNAV_STATUS_OK ||
dvdnav_set_readahead_flag(state->dvdnav, 0) != DVDNAV_STATUS_OK ||
dvdnav_set_PGC_positioning_flag(state->dvdnav, 1) != DVDNAV_STATUS_OK ||
dvdnav_get_region_mask(state->dvdnav, &disc_region_mask) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to open the DVD for playback\n");
goto end_dvdnav_error;
}
player_region_mask = c->opt_region > 0 ? (1 << (c->opt_region - 1)) : disc_region_mask;
if (dvdnav_set_region_mask(state->dvdnav, player_region_mask) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to set the playback region code %d\n", c->opt_region);
goto end_dvdnav_error;
}
if (c->opt_pgc > 0 && c->opt_pg > 0) {
if (dvdnav_program_play(state->dvdnav, c->opt_title, c->opt_pgc, c->opt_pg) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to start playback at title %d, PGC %d, PG %d\n",
c->opt_title, c->opt_pgc, c->opt_pg);
goto end_dvdnav_error;
}
state->pgcn = c->opt_pgc;
state->entry_pgn = c->opt_pg;
} else {
if (dvdnav_part_play(state->dvdnav, c->opt_title, c->opt_chapter_start) != DVDNAV_STATUS_OK ||
dvdnav_current_title_program(state->dvdnav, &cur_title, &cur_pgcn, &cur_pgn) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to start playback at title %d, chapter (PTT) %d\n",
c->opt_title, c->opt_chapter_start);
goto end_dvdnav_error;
}
state->pgcn = cur_pgcn;
state->entry_pgn = cur_pgn;
}
pgc = c->vts_ifo->vts_pgcit->pgci_srp[state->pgcn - 1].pgc;
if (pgc->pg_playback_mode != 0) {
av_log(s, AV_LOG_ERROR, "Non-sequential PGCs, such as shuffles, are not supported\n");
return AVERROR_PATCHWELCOME;
}
if (c->opt_trim && !dvdvideo_is_pgc_promising(s, pgc)) {
av_log(s, AV_LOG_ERROR, "Title %d, PGC %d looks empty (may consist of padding cells), "
"if you want to try anyway, disable the -trim option\n",
c->opt_title, state->pgcn);
return AVERROR_INVALIDDATA;
}
if (dvdnav_angle_change(state->dvdnav, c->opt_angle) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to start playback at angle %d\n", c->opt_angle);
goto end_dvdnav_error;
}
/* dvdnav_describe_title_chapters() performs several validations on the title structure */
/* take advantage of this side effect to increase chances of a safe navigation path */
state->pgc_nb_pg_est = dvdnav_describe_title_chapters(state->dvdnav, c->opt_title,
&state->pgc_pg_times_est,
&state->pgc_duration_est);
/* dvdnav returning 0 PGs is documented as an error condition */
if (!state->pgc_nb_pg_est) {
av_log(s, AV_LOG_ERROR, "Unable to read chapter information for title %d\n", c->opt_title);
goto end_dvdnav_error;
}
state->nav_pts = dvdnav_get_current_time(state->dvdnav);
state->vtsn = c->vmg_ifo->tt_srpt->title[c->opt_title - 1].title_set_nr;
state->pgc = pgc;
return 0;
end_dvdnav_error:
if (state->dvdnav)
av_log(s, AV_LOG_ERROR, "dvdnav error: %s\n", dvdnav_err_to_string(state->dvdnav));
else
av_log(s, AV_LOG_ERROR, "dvdnav could not be initialized\n");
return AVERROR_EXTERNAL;
}
static int dvdvideo_play_next_ps_block(AVFormatContext *s, DVDVideoPlaybackState *state,
uint8_t *buf, int buf_size,
int *p_nav_event,
void (*flush_cb)(AVFormatContext *s))
{
DVDVideoDemuxContext *c = s->priv_data;
uint8_t nav_buf[DVDVIDEO_BLOCK_SIZE] = {0};
int nav_event;
int nav_len;
dvdnav_vts_change_event_t *e_vts;
dvdnav_cell_change_event_t *e_cell;
int cur_title, cur_pgcn, cur_pgn, cur_angle, cur_title_unused, cur_ptt, cur_nb_angles;
pci_t *e_pci;
dsi_t *e_dsi;
if (buf_size != DVDVIDEO_BLOCK_SIZE) {
av_log(s, AV_LOG_ERROR, "Invalid buffer size (expected=%d actual=%d)\n",
DVDVIDEO_BLOCK_SIZE, buf_size);
return AVERROR(EINVAL);
}
for (int i = 0; i < DVDVIDEO_MAX_PS_SEARCH_BLOCKS; i++) {
if (ff_check_interrupt(&s->interrupt_callback))
return AVERROR_EXIT;
if (dvdnav_get_next_block(state->dvdnav, nav_buf, &nav_event, &nav_len) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to read next block of PGC\n");
goto end_dvdnav_error;
}
/* STOP event can come at any time and should be honored */
if (nav_event == DVDNAV_STOP)
return AVERROR_EOF;
if (nav_len > DVDVIDEO_BLOCK_SIZE) {
av_log(s, AV_LOG_ERROR, "Invalid block size (expected<=%d actual=%d)\n",
DVDVIDEO_BLOCK_SIZE, nav_len);
return AVERROR_INVALIDDATA;
}
if (dvdnav_current_title_info(state->dvdnav, &cur_title, &cur_ptt) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to determine current title coordinates\n");
goto end_dvdnav_error;
}
/* we somehow navigated to a menu */
if (cur_title == 0 || !dvdnav_is_domain_vts(state->dvdnav))
return AVERROR_EOF;
if (dvdnav_current_title_program(state->dvdnav, &cur_title_unused, &cur_pgcn, &cur_pgn) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to determine current PGC coordinates\n");
goto end_dvdnav_error;
}
/* we somehow left the PGC */
if (state->in_pgc && cur_pgcn != state->pgcn)
return AVERROR_EOF;
if (dvdnav_get_angle_info(state->dvdnav, &cur_angle, &cur_nb_angles) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to determine current video angle\n");
goto end_dvdnav_error;
}
av_log(s, nav_event == DVDNAV_BLOCK_OK ? AV_LOG_TRACE : AV_LOG_DEBUG,
"new block: i=%d nav_event=%d nav_len=%d cur_title=%d "
"cur_ptt=%d cur_angle=%d cur_celln=%d cur_pgcn=%d cur_pgn=%d "
"play_in_vts=%d play_in_pgc=%d play_in_ps=%d\n",
i, nav_event, nav_len, cur_title,
cur_ptt, cur_angle, state->celln, cur_pgcn, cur_pgn,
state->in_vts, state->in_pgc, state->in_ps);
switch (nav_event) {
case DVDNAV_VTS_CHANGE:
if (state->in_vts)
return AVERROR_EOF;
e_vts = (dvdnav_vts_change_event_t *) nav_buf;
if (e_vts->new_vtsN == state->vtsn && e_vts->new_domain == DVD_DOMAIN_VTSTitle)
state->in_vts = 1;
continue;
case DVDNAV_CELL_CHANGE:
if (!state->in_vts)
continue;
e_cell = (dvdnav_cell_change_event_t *) nav_buf;
av_log(s, AV_LOG_DEBUG, "new cell: prev=%d new=%d\n", state->celln, e_cell->cellN);
if (!state->in_ps && !state->in_pgc) {
if (cur_title == c->opt_title &&
(c->opt_pgc || cur_ptt == c->opt_chapter_start) &&
cur_pgcn == state->pgcn &&
cur_pgn == state->entry_pgn) {
state->in_pgc = 1;
}
} else if (!state->is_seeking &&
(state->celln >= e_cell->cellN || state->pgn > cur_pgn)) {
return AVERROR_EOF;
}
state->celln = e_cell->cellN;
state->ptt = cur_ptt;
state->pgn = cur_pgn;
continue;
case DVDNAV_NAV_PACKET:
if (!state->in_pgc)
continue;
if ((!state->is_seeking && state->ptt > 0 && state->ptt > cur_ptt) ||
(c->opt_chapter_end > 0 && cur_ptt > c->opt_chapter_end)) {
return AVERROR_EOF;
}
e_pci = dvdnav_get_current_nav_pci(state->dvdnav);
e_dsi = dvdnav_get_current_nav_dsi(state->dvdnav);
if (e_pci == NULL || e_dsi == NULL ||
e_pci->pci_gi.vobu_s_ptm > e_pci->pci_gi.vobu_e_ptm) {
av_log(s, AV_LOG_ERROR, "Invalid NAV packet\n");
return AVERROR_INVALIDDATA;
}
state->vobu_duration = e_pci->pci_gi.vobu_e_ptm - e_pci->pci_gi.vobu_s_ptm;
state->pgc_elapsed += state->vobu_duration;
state->nav_pts = dvdnav_get_current_time(state->dvdnav);
state->ptt = cur_ptt;
state->pgn = cur_pgn;
av_log(s, AV_LOG_DEBUG,
"NAV packet: s_ptm=%d e_ptm=%d "
"scr=%d lbn=%d vobu_duration=%d nav_pts=%" PRId64 "\n",
e_pci->pci_gi.vobu_s_ptm, e_pci->pci_gi.vobu_e_ptm,
e_dsi->dsi_gi.nv_pck_scr,
e_pci->pci_gi.nv_pck_lbn, state->vobu_duration, state->nav_pts);
if (!state->in_ps) {
if (c->opt_trim && !dvdvideo_is_cell_promising(s, state->pgc, state->celln)) {
av_log(s, AV_LOG_INFO, "Skipping padding cell #%d\n", state->celln);
i = 0;
continue;
}
av_log(s, AV_LOG_DEBUG, "navigation: locked to program stream\n");
state->in_ps = 1;
} else {
if (state->vobu_e_ptm != e_pci->pci_gi.vobu_s_ptm) {
if (flush_cb)
flush_cb(s);
state->ts_offset += state->vobu_e_ptm - e_pci->pci_gi.vobu_s_ptm;
}
}
state->vobu_e_ptm = e_pci->pci_gi.vobu_e_ptm;
(*p_nav_event) = nav_event;
return nav_len;
case DVDNAV_BLOCK_OK:
if (!state->in_ps) {
if (state->in_pgc)
i = 0; /* necessary in case we are skipping junk cells at the beginning */
continue;
}
if (nav_len != DVDVIDEO_BLOCK_SIZE) {
av_log(s, AV_LOG_ERROR, "Invalid MPEG block size (expected=%d actual=%d)\n",
DVDVIDEO_BLOCK_SIZE, nav_len);
return AVERROR_INVALIDDATA;
}
if (cur_angle != c->opt_angle) {
av_log(s, AV_LOG_ERROR, "Unexpected angle change (expected=%d new=%d)\n",
c->opt_angle, cur_angle);
return AVERROR_INPUT_CHANGED;
}
memcpy(buf, &nav_buf, nav_len);
if (state->pgn != cur_pgn)
av_log(s, AV_LOG_WARNING, "Unexpected PG change (expected=%d actual=%d); "
"this could be due to a missed NAV packet\n",
state->pgn, cur_pgn);
(*p_nav_event) = nav_event;
state->is_seeking = 0;
return nav_len;
case DVDNAV_WAIT:
if (dvdnav_wait_skip(state->dvdnav) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to skip WAIT event\n");
goto end_dvdnav_error;
}
continue;
case DVDNAV_STILL_FRAME:
case DVDNAV_HOP_CHANNEL:
case DVDNAV_HIGHLIGHT:
if (state->in_ps)
return AVERROR_EOF;
if (nav_event == DVDNAV_STILL_FRAME) {
if (dvdnav_still_skip(state->dvdnav) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "Unable to skip still image\n");
goto end_dvdnav_error;
}
}
continue;
default:
continue;
}
}
av_log(s, AV_LOG_ERROR, "Unable to find next program stream block\n");
return AVERROR_INVALIDDATA;
end_dvdnav_error:
av_log(s, AV_LOG_ERROR, "dvdnav error (title=%d pgc=%d pg=%d cell=%d): %s\n",
cur_title, cur_pgcn, cur_pgn, state->celln,
dvdnav_err_to_string(state->dvdnav));
return AVERROR_EXTERNAL;
}
static int dvdvideo_chapters_setup_simple(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
uint64_t time_prev = 0;
int64_t total_duration = 0;
int chapter_start = c->opt_chapter_start;
int chapter_end = c->opt_chapter_end > 0 ? c->opt_chapter_end : c->play_state.pgc_nb_pg_est - 1;
/* dvdnav_describe_title_chapters() describes PGs rather than PTTs, so validate our range */
if (c->play_state.pgc_nb_pg_est == 1 ||
chapter_start > c->play_state.pgc_nb_pg_est ||
chapter_end > c->play_state.pgc_nb_pg_est) {
s->duration = av_rescale_q(c->play_state.pgc_duration_est,
DVDVIDEO_TIME_BASE_Q, AV_TIME_BASE_Q);
return 0;
}
for (int i = chapter_start - 1; i < chapter_end; i++) {
uint64_t time_effective = c->play_state.pgc_pg_times_est[i] - c->play_state.nav_pts;
if (time_effective - time_prev == 0)
continue;
if (chapter_start != chapter_end &&
!avpriv_new_chapter(s, i, DVDVIDEO_TIME_BASE_Q, time_prev, time_effective, NULL)) {
return AVERROR(ENOMEM);
}
time_prev = time_effective;
total_duration = time_effective;
}
if (c->opt_chapter_start == 1 && c->opt_chapter_end == 0)
s->duration = av_rescale_q(c->play_state.pgc_duration_est,
DVDVIDEO_TIME_BASE_Q, AV_TIME_BASE_Q);
else
s->duration = av_rescale_q(total_duration,
DVDVIDEO_TIME_BASE_Q, AV_TIME_BASE_Q);
return 0;
}
static int dvdvideo_chapters_setup_preindex(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
int ret = 0, interrupt = 0;
int nb_chapters = 0, last_ptt = c->opt_chapter_start;
uint64_t cur_chapter_offset = 0, cur_chapter_duration = 0;
DVDVideoPlaybackState state = {0};
uint8_t nav_buf[DVDVIDEO_BLOCK_SIZE];
int nav_event;
if (c->opt_chapter_start == c->opt_chapter_end)
return ret;
if ((ret = dvdvideo_play_open(s, &state)) < 0)
return ret;
if (state.pgc->nr_of_programs == 1)
goto end_close;
av_log(s, AV_LOG_INFO,
"Indexing chapter markers, this will take a long time. Please wait...\n");
while (!(interrupt = ff_check_interrupt(&s->interrupt_callback))) {
ret = dvdvideo_play_next_ps_block(s, &state, nav_buf, DVDVIDEO_BLOCK_SIZE,
&nav_event, NULL);
if (ret < 0 && ret != AVERROR_EOF)
goto end_close;
if (nav_event != DVDNAV_NAV_PACKET && ret != AVERROR_EOF)
continue;
if (state.ptt == last_ptt) {
cur_chapter_duration += state.vobu_duration;
/* ensure we add the last chapter */
if (ret != AVERROR_EOF)
continue;
}
if (cur_chapter_duration > 0) {
if (!avpriv_new_chapter(s, nb_chapters, DVDVIDEO_TIME_BASE_Q, cur_chapter_offset,
cur_chapter_offset + cur_chapter_duration, NULL)) {
ret = AVERROR(ENOMEM);
goto end_close;
}
nb_chapters++;
}
cur_chapter_offset += cur_chapter_duration;
cur_chapter_duration = state.vobu_duration;
last_ptt = state.ptt;
if (ret == AVERROR_EOF)
break;
}
if (interrupt) {
ret = AVERROR_EXIT;
goto end_close;
}
if (ret < 0 && ret != AVERROR_EOF)
goto end_close;
s->duration = av_rescale_q(state.pgc_elapsed, DVDVIDEO_TIME_BASE_Q, AV_TIME_BASE_Q);
av_log(s, AV_LOG_INFO, "Chapter marker indexing complete\n");
ret = 0;
end_close:
dvdvideo_play_close(s, &state);
return ret;
}
static int dvdvideo_video_stream_analyze(AVFormatContext *s, video_attr_t video_attr,
DVDVideoVTSVideoStreamEntry *entry)
{
AVRational framerate;
int height = 0;
int width = 0;
int is_pal = video_attr.video_format == 1;
framerate = is_pal ? (AVRational) { 25, 1 } : (AVRational) { 30000, 1001 };
height = is_pal ? 576 : 480;
if (height > 0) {
switch (video_attr.picture_size) {
case 0: /* D1 */
width = 720;
break;
case 1: /* 4CIF */
width = 704;
break;
case 2: /* Half D1 */
width = 352;
break;
case 3: /* CIF */
width = 352;
height /= 2;
break;
}
}
if (!width || !height) {
av_log(s, AV_LOG_ERROR, "Invalid video stream parameters in the IFO headers, "
"this could be an authoring error or empty title "
"(video_format=%d picture_size=%d)\n",
video_attr.video_format, video_attr.picture_size);
return AVERROR_INVALIDDATA;
}
entry->startcode = 0x1E0;
entry->codec_id = !video_attr.mpeg_version ? AV_CODEC_ID_MPEG1VIDEO : AV_CODEC_ID_MPEG2VIDEO;
entry->width = width;
entry->height = height;
entry->dar = video_attr.display_aspect_ratio ? (AVRational) { 16, 9 } : (AVRational) { 4, 3 };
entry->framerate = framerate;
entry->has_cc = !is_pal && (video_attr.line21_cc_1 || video_attr.line21_cc_2);
return 0;
}
static int dvdvideo_video_stream_add(AVFormatContext *s,
DVDVideoVTSVideoStreamEntry *entry,
enum AVStreamParseType need_parsing)
{
AVStream *st;
FFStream *sti;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->id = entry->startcode;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = entry->codec_id;
st->codecpar->width = entry->width;
st->codecpar->height = entry->height;
st->codecpar->format = AV_PIX_FMT_YUV420P;
st->codecpar->color_range = AVCOL_RANGE_MPEG;
#if FF_API_R_FRAME_RATE
st->r_frame_rate = entry->framerate;
#endif
st->avg_frame_rate = entry->framerate;
sti = ffstream(st);
sti->request_probe = 0;
sti->need_parsing = need_parsing;
sti->display_aspect_ratio = entry->dar;
avpriv_set_pts_info(st, DVDVIDEO_PTS_WRAP_BITS,
DVDVIDEO_TIME_BASE_Q.num, DVDVIDEO_TIME_BASE_Q.den);
return 0;
}
static int dvdvideo_video_stream_setup(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
int ret;
DVDVideoVTSVideoStreamEntry entry = {0};
video_attr_t video_attr;
if (c->opt_menu)
video_attr = !c->opt_menu_vts ? c->vmg_ifo->vmgi_mat->vmgm_video_attr :
c->vts_ifo->vtsi_mat->vtsm_video_attr;
else
video_attr = c->vts_ifo->vtsi_mat->vts_video_attr;
if ((ret = dvdvideo_video_stream_analyze(s, video_attr, &entry)) < 0 ||
(ret = dvdvideo_video_stream_add(s, &entry, AVSTREAM_PARSE_HEADERS)) < 0) {
av_log(s, AV_LOG_ERROR, "Unable to add video stream\n");
return ret;
}
return 0;
}
static int dvdvideo_audio_stream_analyze(AVFormatContext *s, audio_attr_t audio_attr,
uint16_t audio_control, DVDVideoPGCAudioStreamEntry *entry)
{
int startcode = 0;
enum AVCodecID codec_id = AV_CODEC_ID_NONE;
int sample_fmt = AV_SAMPLE_FMT_NONE;
int sample_rate = 0;
int bit_depth = 0;
int nb_channels = 0;
AVChannelLayout ch_layout = (AVChannelLayout) {0};
char lang_dvd[3] = {0};
int position = (audio_control & 0x7F00) >> 8;
/* XXX(PATCHWELCOME): SDDS is not supported due to lack of sample material */
switch (audio_attr.audio_format) {
case 0: /* AC3 */
codec_id = AV_CODEC_ID_AC3;
sample_fmt = AV_SAMPLE_FMT_FLTP;
sample_rate = 48000;
startcode = 0x80 + position;
break;
case 2: /* MP1 */
codec_id = AV_CODEC_ID_MP1;
sample_fmt = audio_attr.quantization ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
sample_rate = 48000;
bit_depth = audio_attr.quantization ? 20 : 16;
startcode = 0x1C0 + position;
break;
case 3: /* MP2 */
codec_id = AV_CODEC_ID_MP2;
sample_fmt = audio_attr.quantization ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
sample_rate = 48000;
bit_depth = audio_attr.quantization ? 20 : 16;
startcode = 0x1C0 + position;
break;
case 4: /* DVD PCM */
codec_id = AV_CODEC_ID_PCM_DVD;
sample_fmt = audio_attr.quantization ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
sample_rate = audio_attr.sample_frequency ? 96000 : 48000;
bit_depth = audio_attr.quantization == 2 ? 24 : (audio_attr.quantization ? 20 : 16);
startcode = 0xA0 + position;
break;
case 6: /* DCA */
codec_id = AV_CODEC_ID_DTS;
sample_fmt = AV_SAMPLE_FMT_FLTP;
sample_rate = 48000;
bit_depth = audio_attr.quantization == 2 ? 24 : (audio_attr.quantization ? 20 : 16);
startcode = 0x88 + position;
break;
}
nb_channels = audio_attr.channels + 1;
if (codec_id == AV_CODEC_ID_NONE ||
startcode == 0 ||
sample_fmt == AV_SAMPLE_FMT_NONE ||
sample_rate == 0 ||
nb_channels == 0) {
av_log(s, AV_LOG_ERROR, "Invalid audio stream parameters in the IFO headers, "
"this could be an authoring error or dummy title "
"(stream position %d in IFO)\n", position);
return AVERROR_INVALIDDATA;
}
if (nb_channels == 1)
ch_layout = (AVChannelLayout) AV_CHANNEL_LAYOUT_MONO;
else if (nb_channels == 2)
ch_layout = (AVChannelLayout) AV_CHANNEL_LAYOUT_STEREO;
else if (nb_channels == 6)
ch_layout = (AVChannelLayout) AV_CHANNEL_LAYOUT_5POINT1;
else if (nb_channels == 7)
ch_layout = (AVChannelLayout) AV_CHANNEL_LAYOUT_6POINT1;
else if (nb_channels == 8)
ch_layout = (AVChannelLayout) AV_CHANNEL_LAYOUT_7POINT1;
/* XXX(PATCHWELCOME): IFO structures have metadata on karaoke tracks for additional features */
if (audio_attr.application_mode == 1) {
entry->disposition |= AV_DISPOSITION_KARAOKE;
av_log(s, AV_LOG_WARNING, "Extended karaoke metadata is not supported at this time "
"(stream id=%d)\n", startcode);
}
if (audio_attr.code_extension == 2)
entry->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
if (audio_attr.code_extension == 3 || audio_attr.code_extension == 4)
entry->disposition |= AV_DISPOSITION_COMMENT;
AV_WB16(lang_dvd, audio_attr.lang_code);
entry->startcode = startcode;
entry->codec_id = codec_id;
entry->sample_rate = sample_rate;
entry->bit_depth = bit_depth;
entry->nb_channels = nb_channels;
entry->ch_layout = ch_layout;
entry->lang_iso = ff_convert_lang_to(lang_dvd, AV_LANG_ISO639_2_BIBL);
return 0;
}
static int dvdvideo_audio_stream_add(AVFormatContext *s, DVDVideoPGCAudioStreamEntry *entry,
enum AVStreamParseType need_parsing)
{
AVStream *st;
FFStream *sti;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->id = entry->startcode;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = entry->codec_id;
st->codecpar->format = entry->sample_fmt;
st->codecpar->sample_rate = entry->sample_rate;
st->codecpar->bits_per_coded_sample = entry->bit_depth;
st->codecpar->bits_per_raw_sample = entry->bit_depth;
st->codecpar->ch_layout = entry->ch_layout;
st->codecpar->ch_layout.nb_channels = entry->nb_channels;
st->disposition = entry->disposition;
if (entry->lang_iso)
av_dict_set(&st->metadata, "language", entry->lang_iso, 0);
sti = ffstream(st);
sti->request_probe = 0;
sti->need_parsing = need_parsing;
avpriv_set_pts_info(st, DVDVIDEO_PTS_WRAP_BITS,
DVDVIDEO_TIME_BASE_Q.num, DVDVIDEO_TIME_BASE_Q.den);
return 0;
}
static int dvdvideo_audio_stream_add_all(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
int ret;
int nb_streams;
if (c->opt_menu)
nb_streams = !c->opt_menu_vts ? c->vmg_ifo->vmgi_mat->nr_of_vmgm_audio_streams :
c->vts_ifo->vtsi_mat->nr_of_vtsm_audio_streams;
else
nb_streams = c->vts_ifo->vtsi_mat->nr_of_vts_audio_streams;
for (int i = 0; i < nb_streams; i++) {
DVDVideoPGCAudioStreamEntry entry = {0};
audio_attr_t audio_attr;
if (c->opt_menu)
audio_attr = !c->opt_menu_vts ? c->vmg_ifo->vmgi_mat->vmgm_audio_attr :
c->vts_ifo->vtsi_mat->vtsm_audio_attr;
else
audio_attr = c->vts_ifo->vtsi_mat->vts_audio_attr[i];
if (!(c->play_state.pgc->audio_control[i] & 0x8000))
continue;
if ((ret = dvdvideo_audio_stream_analyze(s, audio_attr, c->play_state.pgc->audio_control[i],
&entry)) < 0)
goto break_error;
/* IFO structures can declare duplicate entries for the same startcode */
for (int j = 0; j < s->nb_streams; j++)
if (s->streams[j]->id == entry.startcode)
continue;
if ((ret = dvdvideo_audio_stream_add(s, &entry, AVSTREAM_PARSE_HEADERS)) < 0)
goto break_error;
continue;
break_error:
av_log(s, AV_LOG_ERROR, "Unable to add audio stream at position %d\n", i);
return ret;
}
return 0;
}
static int dvdvideo_subp_stream_analyze(AVFormatContext *s, uint32_t offset, subp_attr_t subp_attr,
DVDVideoPGCSubtitleStreamEntry *entry)
{
DVDVideoDemuxContext *c = s->priv_data;
char lang_dvd[3] = {0};
entry->startcode = 0x20 + (offset & 0x1F);
if (subp_attr.lang_extension == 9)
entry->disposition |= AV_DISPOSITION_FORCED;
memcpy(&entry->clut, c->play_state.pgc->palette, FF_DVDCLUT_CLUT_SIZE);
/* dvdsub palettes currently have no colorspace tagging and all muxers only support RGB */
/* this is not a lossless conversion, but no use cases are supported for the original YUV */
ff_dvdclut_yuv_to_rgb(entry->clut, FF_DVDCLUT_CLUT_SIZE);
AV_WB16(lang_dvd, subp_attr.lang_code);
entry->lang_iso = ff_convert_lang_to(lang_dvd, AV_LANG_ISO639_2_BIBL);
return 0;
}
static int dvdvideo_subp_stream_add(AVFormatContext *s, DVDVideoPGCSubtitleStreamEntry *entry,
enum AVStreamParseType need_parsing)
{
AVStream *st;
FFStream *sti;
int ret;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->id = entry->startcode;
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codecpar->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
if ((ret = ff_dvdclut_palette_extradata_cat(entry->clut, FF_DVDCLUT_CLUT_SIZE, st->codecpar)) < 0)
return ret;
if (entry->lang_iso)
av_dict_set(&st->metadata, "language", entry->lang_iso, 0);
av_dict_set(&st->metadata, "VIEWPORT", dvdvideo_subp_viewport_labels[entry->viewport], 0);
st->disposition = entry->disposition;
sti = ffstream(st);
sti->request_probe = 0;
sti->need_parsing = need_parsing;
avpriv_set_pts_info(st, DVDVIDEO_PTS_WRAP_BITS,
DVDVIDEO_TIME_BASE_Q.num, DVDVIDEO_TIME_BASE_Q.den);
return 0;
}
static int dvdvideo_subp_stream_add_internal(AVFormatContext *s, uint32_t offset,
subp_attr_t subp_attr,
enum DVDVideoSubpictureViewport viewport)
{
int ret;
DVDVideoPGCSubtitleStreamEntry entry = {0};
entry.viewport = viewport;
if ((ret = dvdvideo_subp_stream_analyze(s, offset, subp_attr, &entry)) < 0)
goto end_error;
/* IFO structures can declare duplicate entries for the same startcode */
for (int i = 0; i < s->nb_streams; i++)
if (s->streams[i]->id == entry.startcode)
return 0;
if ((ret = dvdvideo_subp_stream_add(s, &entry, AVSTREAM_PARSE_HEADERS)) < 0)
goto end_error;
return 0;
end_error:
av_log(s, AV_LOG_ERROR, "Unable to add subtitle stream\n");
return ret;
}
static int dvdvideo_subp_stream_add_all(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
int nb_streams;
if (c->opt_menu)
nb_streams = !c->opt_menu_vts ? c->vmg_ifo->vmgi_mat->nr_of_vmgm_subp_streams :
c->vts_ifo->vtsi_mat->nr_of_vtsm_subp_streams;
else
nb_streams = c->vts_ifo->vtsi_mat->nr_of_vts_subp_streams;
for (int i = 0; i < nb_streams; i++) {
int ret;
uint32_t subp_control;
subp_attr_t subp_attr;
video_attr_t video_attr;
subp_control = c->play_state.pgc->subp_control[i];
if (!(subp_control & 0x80000000))
continue;
/* there can be several presentations for one SPU */
/* the DAR check is flexible in order to support weird authoring */
if (c->opt_menu) {
video_attr = !c->opt_menu_vts ? c->vmg_ifo->vmgi_mat->vmgm_video_attr :
c->vts_ifo->vtsi_mat->vtsm_video_attr;
subp_attr = !c->opt_menu_vts ? c->vmg_ifo->vmgi_mat->vmgm_subp_attr :
c->vts_ifo->vtsi_mat->vtsm_subp_attr;
} else {
video_attr = c->vts_ifo->vtsi_mat->vts_video_attr;
subp_attr = c->vts_ifo->vtsi_mat->vts_subp_attr[i];
}
/* 4:3 */
if (!video_attr.display_aspect_ratio) {
if ((ret = dvdvideo_subp_stream_add_internal(s, subp_control >> 24, subp_attr,
DVDVIDEO_SUBP_VIEWPORT_FULLSCREEN)) < 0)
return ret;
continue;
}
/* 16:9 */
if (( ret = dvdvideo_subp_stream_add_internal(s, subp_control >> 16, subp_attr,
DVDVIDEO_SUBP_VIEWPORT_WIDESCREEN)) < 0)
return ret;
/* 16:9 letterbox */
if (video_attr.permitted_df == 2 || video_attr.permitted_df == 0)
if ((ret = dvdvideo_subp_stream_add_internal(s, subp_control >> 8, subp_attr,
DVDVIDEO_SUBP_VIEWPORT_LETTERBOX)) < 0)
return ret;
/* 16:9 pan-and-scan */
if (video_attr.permitted_df == 1 || video_attr.permitted_df == 0)
if ((ret = dvdvideo_subp_stream_add_internal(s, subp_control, subp_attr,
DVDVIDEO_SUBP_VIEWPORT_PANSCAN)) < 0)
return ret;
}
return 0;
}
static void dvdvideo_subdemux_flush(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
if (!c->segment_started)
return;
av_log(s, AV_LOG_DEBUG, "flushing sub-demuxer\n");
avio_flush(&c->mpeg_pb.pub);
ff_read_frame_flush(c->mpeg_ctx);
c->segment_started = 0;
}
static int dvdvideo_subdemux_read_data(void *opaque, uint8_t *buf, int buf_size)
{
AVFormatContext *s = opaque;
DVDVideoDemuxContext *c = s->priv_data;
int ret = 0;
int nav_event;
if (c->play_end)
return AVERROR_EOF;
if (c->opt_menu)
ret = dvdvideo_menu_next_ps_block(s, &c->play_state, buf, buf_size,
dvdvideo_subdemux_flush);
else
ret = dvdvideo_play_next_ps_block(opaque, &c->play_state, buf, buf_size,
&nav_event, dvdvideo_subdemux_flush);
if (ret == AVERROR_EOF) {
c->mpeg_pb.pub.eof_reached = 1;
c->play_end = 1;
return AVERROR_EOF;
}
if (ret >= 0 && nav_event == DVDNAV_NAV_PACKET)
return FFERROR_REDO;
return ret;
}
static void dvdvideo_subdemux_close(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
av_freep(&c->mpeg_pb.pub.buffer);
avformat_close_input(&c->mpeg_ctx);
}
static int dvdvideo_subdemux_open(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
extern const FFInputFormat ff_mpegps_demuxer;
int ret;
if (!(c->mpeg_buf = av_mallocz(DVDVIDEO_BLOCK_SIZE)))
return AVERROR(ENOMEM);
ffio_init_context(&c->mpeg_pb, c->mpeg_buf, DVDVIDEO_BLOCK_SIZE, 0, s,
dvdvideo_subdemux_read_data, NULL, NULL);
c->mpeg_pb.pub.seekable = 0;
if (!(c->mpeg_ctx = avformat_alloc_context()))
return AVERROR(ENOMEM);
if ((ret = ff_copy_whiteblacklists(c->mpeg_ctx, s)) < 0) {
avformat_free_context(c->mpeg_ctx);
c->mpeg_ctx = NULL;
return ret;
}
c->mpeg_ctx->flags = AVFMT_FLAG_CUSTOM_IO | AVFMT_FLAG_GENPTS;
c->mpeg_ctx->ctx_flags |= AVFMTCTX_UNSEEKABLE;
c->mpeg_ctx->probesize = 0;
c->mpeg_ctx->max_analyze_duration = 0;
c->mpeg_ctx->interrupt_callback = s->interrupt_callback;
c->mpeg_ctx->pb = &c->mpeg_pb.pub;
c->mpeg_ctx->correct_ts_overflow = 0;
c->mpeg_ctx->io_open = NULL;
return avformat_open_input(&c->mpeg_ctx, "", &ff_mpegps_demuxer.p, NULL);
}
static int dvdvideo_read_header(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
int ret;
if (c->opt_menu) {
if (c->opt_region ||
c->opt_title > 1 ||
c->opt_preindex ||
c->opt_chapter_start > 1 ||
c->opt_chapter_end > 0) {
av_log(s, AV_LOG_ERROR, "-menu is not compatible with the -region, -title, "
"-preindex, or -chapter_start/-chapter_end options\n");
return AVERROR(EINVAL);
}
if (!c->opt_pgc) {
av_log(s, AV_LOG_ERROR, "If -menu is enabled, -pgc must be set to a non-zero value\n");
return AVERROR(EINVAL);
}
if (!c->opt_menu_lu) {
av_log(s, AV_LOG_INFO, "Defaulting to menu language unit #1. "
"This is not always desirable, validation suggested.\n");
c->opt_menu_lu = 1;
}
if (!c->opt_pg) {
av_log(s, AV_LOG_INFO, "Defaulting to menu PG #1. "
"This is not always desirable, validation suggested.\n");
c->opt_pg = 1;
}
if ((ret = dvdvideo_ifo_open(s)) < 0 ||
(ret = dvdvideo_menu_open(s, &c->play_state)) < 0 ||
(ret = dvdvideo_subdemux_open(s)) < 0 ||
(ret = dvdvideo_video_stream_setup(s)) < 0 ||
(ret = dvdvideo_audio_stream_add_all(s)) < 0)
return ret;
return 0;
}
if (c->opt_chapter_end != 0 && c->opt_chapter_start > c->opt_chapter_end) {
av_log(s, AV_LOG_ERROR, "Chapter (PTT) range [%d, %d] is invalid\n",
c->opt_chapter_start, c->opt_chapter_end);
return AVERROR(EINVAL);
}
if (c->opt_title == 0) {
av_log(s, AV_LOG_INFO, "Defaulting to title #1. "
"This is not always the main feature, validation suggested.\n");
c->opt_title = 1;
}
if (c->opt_pgc) {
if (c->opt_pg == 0) {
av_log(s, AV_LOG_ERROR, "Invalid coordinates. If -pgc is set, -pg must be set too.\n");
return AVERROR(EINVAL);
} else if (c->opt_chapter_start > 1 || c->opt_chapter_end > 0 || c->opt_preindex) {
av_log(s, AV_LOG_ERROR, "-pgc is not compatible with the -preindex or "
"-chapter_start/-chapter_end options\n");
return AVERROR(EINVAL);
}
}
if ((ret = dvdvideo_ifo_open(s)) < 0)
return ret;
if (!c->opt_pgc && c->opt_preindex && (ret = dvdvideo_chapters_setup_preindex(s)) < 0)
return ret;
if ((ret = dvdvideo_play_open(s, &c->play_state)) < 0 ||
(ret = dvdvideo_subdemux_open(s)) < 0 ||
(ret = dvdvideo_video_stream_setup(s)) < 0 ||
(ret = dvdvideo_audio_stream_add_all(s)) < 0 ||
(ret = dvdvideo_subp_stream_add_all(s)) < 0)
return ret;
if (!c->opt_pgc && !c->opt_preindex)
return dvdvideo_chapters_setup_simple(s);
return 0;
}
static int dvdvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
{
DVDVideoDemuxContext *c = s->priv_data;
int ret;
enum AVMediaType st_type;
int found_stream = 0;
if (c->play_end)
return AVERROR_EOF;
ret = av_read_frame(c->mpeg_ctx, pkt);
if (ret < 0)
return ret;
if (!c->segment_started)
c->segment_started = 1;
st_type = c->mpeg_ctx->streams[pkt->stream_index]->codecpar->codec_type;
/* map the subdemuxer stream to the parent demuxer's stream (by startcode) */
for (int i = 0; i < s->nb_streams; i++) {
if (s->streams[i]->id == c->mpeg_ctx->streams[pkt->stream_index]->id) {
pkt->stream_index = s->streams[i]->index;
found_stream = 1;
break;
}
}
if (!found_stream) {
av_log(s, AV_LOG_DEBUG, "discarding frame with stream that was not in IFO headers "
"(stream id=%d)\n", c->mpeg_ctx->streams[pkt->stream_index]->id);
return FFERROR_REDO;
}
if (pkt->pts != AV_NOPTS_VALUE && pkt->dts != AV_NOPTS_VALUE) {
if (!c->play_started) {
/* try to start at the beginning of a GOP */
if (st_type != AVMEDIA_TYPE_VIDEO || !(pkt->flags & AV_PKT_FLAG_KEY)) {
av_log(s, AV_LOG_VERBOSE, "Discarding packet which is not a video keyframe or "
"with unset PTS/DTS at start\n");
return FFERROR_REDO;
}
c->first_pts = pkt->pts;
c->play_started = 1;
}
pkt->pts += c->play_state.ts_offset - c->first_pts;
pkt->dts += c->play_state.ts_offset - c->first_pts;
if (pkt->pts < 0) {
av_log(s, AV_LOG_VERBOSE, "Discarding packet with negative PTS (st=%d pts=%" PRId64 "), "
"this is OK at start of playback\n",
pkt->stream_index, pkt->pts);
return FFERROR_REDO;
}
} else {
av_log(s, AV_LOG_WARNING, "Unset PTS or DTS @ st=%d pts=%" PRId64 " dts=%" PRId64 "\n",
pkt->stream_index, pkt->pts, pkt->dts);
}
av_log(s, AV_LOG_TRACE, "st=%d pts=%" PRId64 " dts=%" PRId64 " "
"ts_offset=%" PRId64 " first_pts=%" PRId64 "\n",
pkt->stream_index, pkt->pts, pkt->dts,
c->play_state.ts_offset, c->first_pts);
return c->play_end ? AVERROR_EOF : 0;
}
static int dvdvideo_close(AVFormatContext *s)
{
DVDVideoDemuxContext *c = s->priv_data;
dvdvideo_subdemux_close(s);
if (c->opt_menu)
dvdvideo_menu_close(s, &c->play_state);
else
dvdvideo_play_close(s, &c->play_state);
dvdvideo_ifo_close(s);
return 0;
}
static int dvdvideo_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
DVDVideoDemuxContext *c = s->priv_data;
int64_t new_nav_pts;
pci_t* new_nav_pci;
dsi_t* new_nav_dsi;
if (c->opt_menu || c->opt_chapter_start > 1) {
av_log(s, AV_LOG_ERROR, "Seeking is not compatible with menus or chapter extraction\n");
return AVERROR_PATCHWELCOME;
}
if ((flags & AVSEEK_FLAG_BYTE))
return AVERROR(ENOSYS);
if (timestamp < 0)
return AVERROR(EINVAL);
if (!c->seek_warned) {
av_log(s, AV_LOG_WARNING, "Seeking is inherently unreliable and will result "
"in imprecise timecodes from this point\n");
c->seek_warned = 1;
}
/* XXX(PATCHWELCOME): use dvdnav_jump_to_sector_by_time(c->play_state.dvdnav, timestamp, 0)
* when it is available in a released version of libdvdnav; it is more accurate */
if (dvdnav_time_search(c->play_state.dvdnav, timestamp) != DVDNAV_STATUS_OK) {
av_log(s, AV_LOG_ERROR, "libdvdnav: seeking to %" PRId64 " failed\n", timestamp);
return AVERROR_EXTERNAL;
}
new_nav_pts = dvdnav_get_current_time (c->play_state.dvdnav);
new_nav_pci = dvdnav_get_current_nav_pci(c->play_state.dvdnav);
new_nav_dsi = dvdnav_get_current_nav_dsi(c->play_state.dvdnav);
if (new_nav_pci == NULL || new_nav_dsi == NULL) {
av_log(s, AV_LOG_ERROR, "Invalid NAV packet after seeking\n");
return AVERROR_INVALIDDATA;
}
c->play_state.in_pgc = 1;
c->play_state.in_ps = 0;
c->play_state.is_seeking = 1;
c->play_state.nav_pts = timestamp;
c->play_state.ts_offset = timestamp;
c->play_state.vobu_e_ptm = new_nav_pci->pci_gi.vobu_s_ptm;
c->first_pts = 0;
c->play_started = 0;
dvdvideo_subdemux_flush(s);
av_log(s, AV_LOG_DEBUG, "seeking: requested_nav_pts=%" PRId64 " new_nav_pts=%" PRId64 "\n",
timestamp, new_nav_pts);
return 0;
}
#define OFFSET(x) offsetof(DVDVideoDemuxContext, x)
static const AVOption dvdvideo_options[] = {
{"angle", "playback angle number", OFFSET(opt_angle), AV_OPT_TYPE_INT, { .i64=1 }, 1, 9, AV_OPT_FLAG_DECODING_PARAM },
{"chapter_end", "exit chapter (PTT) number (0=end)", OFFSET(opt_chapter_end), AV_OPT_TYPE_INT, { .i64=0 }, 0, 99, AV_OPT_FLAG_DECODING_PARAM },
{"chapter_start", "entry chapter (PTT) number", OFFSET(opt_chapter_start), AV_OPT_TYPE_INT, { .i64=1 }, 1, 99, AV_OPT_FLAG_DECODING_PARAM },
{"menu", "demux menu domain", OFFSET(opt_menu), AV_OPT_TYPE_BOOL, { .i64=0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{"menu_lu", "menu language unit (0=auto)", OFFSET(opt_menu_lu), AV_OPT_TYPE_INT, { .i64=0 }, 0, 99, AV_OPT_FLAG_DECODING_PARAM },
{"menu_vts", "menu VTS (0=VMG main menu)", OFFSET(opt_menu_vts), AV_OPT_TYPE_INT, { .i64=0 }, 0, 99, AV_OPT_FLAG_DECODING_PARAM },
{"pg", "entry PG number (0=auto)", OFFSET(opt_pg), AV_OPT_TYPE_INT, { .i64=0 }, 0, 255, AV_OPT_FLAG_DECODING_PARAM },
{"pgc", "entry PGC number (0=auto)", OFFSET(opt_pgc), AV_OPT_TYPE_INT, { .i64=0 }, 0, 999, AV_OPT_FLAG_DECODING_PARAM },
{"preindex", "enable for accurate chapter markers, slow (2-pass read)", OFFSET(opt_preindex), AV_OPT_TYPE_BOOL, { .i64=0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{"region", "playback region number (0=free)", OFFSET(opt_region), AV_OPT_TYPE_INT, { .i64=0 }, 0, 8, AV_OPT_FLAG_DECODING_PARAM },
{"title", "title number (0=auto)", OFFSET(opt_title), AV_OPT_TYPE_INT, { .i64=0 }, 0, 99, AV_OPT_FLAG_DECODING_PARAM },
{"trim", "trim padding cells from start", OFFSET(opt_trim), AV_OPT_TYPE_BOOL, { .i64=1 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{NULL}
};
static const AVClass dvdvideo_class = {
.class_name = "DVD-Video demuxer",
.item_name = av_default_item_name,
.option = dvdvideo_options,
.version = LIBAVUTIL_VERSION_INT
};
const FFInputFormat ff_dvdvideo_demuxer = {
.p.name = "dvdvideo",
.p.long_name = NULL_IF_CONFIG_SMALL("DVD-Video"),
.p.priv_class = &dvdvideo_class,
.p.flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT | AVFMT_SEEK_TO_PTS |
AVFMT_NOFILE | AVFMT_NO_BYTE_SEEK | AVFMT_NOGENSEARCH | AVFMT_NOBINSEARCH,
.priv_data_size = sizeof(DVDVideoDemuxContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_close = dvdvideo_close,
.read_header = dvdvideo_read_header,
.read_packet = dvdvideo_read_packet,
.read_seek = dvdvideo_read_seek
};
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