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mpv/player/video.c

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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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stddef.h>
#include <stdbool.h>
#include <inttypes.h>
#include <math.h>
#include <assert.h>
#include "config.h"
#include "talloc.h"
#include "common/msg.h"
#include "options/options.h"
#include "options/m_config.h"
#include "options/m_option.h"
#include "common/common.h"
#include "common/encode.h"
#include "options/m_property.h"
#include "osdep/timer.h"
#include "audio/out/ao.h"
#include "demux/demux.h"
#include "stream/stream.h"
#include "sub/osd.h"
#include "video/hwdec.h"
#include "video/filter/vf.h"
#include "video/decode/dec_video.h"
#include "video/decode/vd.h"
#include "video/out/vo.h"
#include "core.h"
#include "command.h"
#include "screenshot.h"
enum {
// update_video() - code also uses: <0 error, 0 eof, >0 progress
VD_ERROR = -1,
VD_EOF = 0, // end of file - no new output
VD_PROGRESS = 1, // progress, but no output; repeat call with no waiting
VD_NEW_FRAME = 2, // the call produced a new frame
VD_WAIT = 3, // no EOF, but no output; wait until wakeup
VD_RECONFIG = 4,
};
static const char av_desync_help_text[] =
"\n\n"
" *************************************************\n"
" **** Audio/Video desynchronisation detected! ****\n"
" *************************************************\n\n"
"This means either the audio or the video is played too slowly.\n"
"Possible reasons, problems, workarounds:\n"
"- Your system is simply too slow for this file.\n"
" Transcode it to a lower bitrate file with e.g. mpv encoding support.\n"
"- Slow video output.\n"
" Try a different --vo driver (--vo=help for a list). Make sure framedrop\n"
" is not disabled, or experiment with different values for --framedrop.\n"
" Make sure you have proper drivers for your GPU installed. If mpv\n"
" autoselects 'VO: [x11]', it's a sure sign your drivers are messed up.\n"
"- Playing from a slow network source. Download the file instead.\n"
"- Try to find out whether audio/video/subs are causing this by experimenting\n"
" with --no-video, --no-audio, or --no-sub.\n"
"If none of this helps you, file a bug report.\n\n";
static bool decode_coverart(struct dec_video *d_video);
static void set_allowed_vo_formats(struct vf_chain *c, struct vo *vo)
{
vo_query_formats(vo, c->allowed_output_formats);
}
static int try_filter(struct MPContext *mpctx, struct mp_image_params params,
char *name, char *label, char **args)
{
struct dec_video *d_video = mpctx->d_video;
struct vf_instance *vf = vf_append_filter(d_video->vfilter, name, args);
if (!vf)
return -1;
vf->label = talloc_strdup(vf, label);
if (video_reconfig_filters(d_video, &params) < 0) {
vf_remove_filter(d_video->vfilter, vf);
// restore
video_reconfig_filters(d_video, &params);
return -1;
}
return 0;
}
// Reconfigure the filter chain according to decoder output.
// probe_only: don't force fallback to software when doing hw decoding, and
// the filter chain couldn't be configured
static void filter_reconfig(struct MPContext *mpctx,
bool probe_only)
{
struct dec_video *d_video = mpctx->d_video;
struct mp_image_params params = d_video->decoder_output;
mp_notify(mpctx, MPV_EVENT_VIDEO_RECONFIG, NULL);
set_allowed_vo_formats(d_video->vfilter, mpctx->video_out);
if (video_reconfig_filters(d_video, &params) < 0) {
// Most video filters don't work with hardware decoding, so this
// might be the reason why filter reconfig failed.
if (!probe_only &&
video_vd_control(d_video, VDCTRL_FORCE_HWDEC_FALLBACK, NULL) == CONTROL_OK)
{
// Fallback active; decoder will return software format next
// time. Don't abort video decoding.
d_video->vfilter->initialized = 0;
mp_image_unrefp(&d_video->waiting_decoded_mpi);
d_video->decoder_output = (struct mp_image_params){0};
MP_VERBOSE(mpctx, "hwdec falback due to filters.\n");
}
return;
}
if (d_video->vfilter->initialized < 1)
return;
if (params.rotate && (params.rotate % 90 == 0)) {
if (!(mpctx->video_out->driver->caps & VO_CAP_ROTATE90)) {
// Try to insert a rotation filter.
char *args[] = {"angle", "auto", NULL};
if (try_filter(mpctx, params, "rotate", "autorotate", args) >= 0) {
params.rotate = 0;
} else {
MP_ERR(mpctx, "Can't insert rotation filter.\n");
}
}
}
if (params.stereo_in != params.stereo_out &&
params.stereo_in > 0 && params.stereo_out >= 0)
{
char *to = (char *)MP_STEREO3D_NAME(params.stereo_out);
if (to) {
char *args[] = {"in", "auto", "out", to, NULL, NULL};
if (try_filter(mpctx, params, "stereo3d", "stereo3d", args) < 0)
MP_ERR(mpctx, "Can't insert 3D conversion filter.\n");
}
}
}
static void recreate_video_filters(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
struct dec_video *d_video = mpctx->d_video;
assert(d_video);
vf_destroy(d_video->vfilter);
d_video->vfilter = vf_new(mpctx->global);
d_video->vfilter->hwdec = d_video->hwdec_info;
d_video->vfilter->wakeup_callback = wakeup_playloop;
d_video->vfilter->wakeup_callback_ctx = mpctx;
d_video->vfilter->container_fps = d_video->fps;
vo_control(mpctx->video_out, VOCTRL_GET_DISPLAY_FPS,
&d_video->vfilter->display_fps);
vf_append_filter_list(d_video->vfilter, opts->vf_settings);
// for vf_sub
osd_set_render_subs_in_filter(mpctx->osd,
vf_control_any(d_video->vfilter, VFCTRL_INIT_OSD, mpctx->osd) > 0);
set_allowed_vo_formats(d_video->vfilter, mpctx->video_out);
}
int reinit_video_filters(struct MPContext *mpctx)
{
struct dec_video *d_video = mpctx->d_video;
if (!d_video)
return 0;
bool need_reconfig = d_video->vfilter->initialized != 0;
recreate_video_filters(mpctx);
if (need_reconfig)
filter_reconfig(mpctx, true);
return d_video->vfilter->initialized;
}
void reset_video_state(struct MPContext *mpctx)
{
if (mpctx->d_video)
video_reset_decoding(mpctx->d_video);
if (mpctx->video_out)
vo_seek_reset(mpctx->video_out);
mp_image_unrefp(&mpctx->next_frame[0]);
mp_image_unrefp(&mpctx->next_frame[1]);
mp_image_unrefp(&mpctx->saved_frame);
mpctx->delay = 0;
mpctx->time_frame = 0;
mpctx->video_pts = MP_NOPTS_VALUE;
mpctx->video_next_pts = MP_NOPTS_VALUE;
mpctx->total_avsync_change = 0;
mpctx->last_av_difference = 0;
mpctx->dropped_frames_total = 0;
mpctx->dropped_frames = 0;
mpctx->drop_message_shown = 0;
mpctx->video_status = mpctx->d_video ? STATUS_SYNCING : STATUS_EOF;
}
void uninit_video_out(struct MPContext *mpctx)
{
uninit_video_chain(mpctx);
if (mpctx->video_out)
vo_destroy(mpctx->video_out);
mpctx->video_out = NULL;
mp_notify(mpctx, MPV_EVENT_VIDEO_RECONFIG, NULL);
}
void uninit_video_chain(struct MPContext *mpctx)
{
if (mpctx->d_video) {
reset_video_state(mpctx);
video_uninit(mpctx->d_video);
mpctx->d_video = NULL;
mpctx->video_status = STATUS_EOF;
mpctx->sync_audio_to_video = false;
reselect_demux_streams(mpctx);
}
mp_notify(mpctx, MPV_EVENT_VIDEO_RECONFIG, NULL);
}
int reinit_video_chain(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
assert(!mpctx->d_video);
struct track *track = mpctx->current_track[0][STREAM_VIDEO];
struct sh_stream *sh = track ? track->stream : NULL;
if (!sh)
goto no_video;
if (!mpctx->video_out) {
struct vo_extra ex = {
.input_ctx = mpctx->input,
.osd = mpctx->osd,
.encode_lavc_ctx = mpctx->encode_lavc_ctx,
.opengl_cb_context = mpctx->gl_cb_ctx,
};
mpctx->video_out = init_best_video_out(mpctx->global, &ex);
if (!mpctx->video_out) {
MP_FATAL(mpctx, "Error opening/initializing "
"the selected video_out (-vo) device.\n");
mpctx->error_playing = MPV_ERROR_VO_INIT_FAILED;
goto err_out;
}
mpctx->mouse_cursor_visible = true;
}
update_window_title(mpctx, true);
struct dec_video *d_video = talloc_zero(NULL, struct dec_video);
mpctx->d_video = d_video;
d_video->global = mpctx->global;
d_video->log = mp_log_new(d_video, mpctx->log, "!vd");
d_video->opts = mpctx->opts;
d_video->header = sh;
d_video->fps = sh->video->fps;
d_video->vo = mpctx->video_out;
MP_VERBOSE(d_video, "Container reported FPS: %f\n", sh->video->fps);
if (opts->force_fps) {
d_video->fps = opts->force_fps;
MP_INFO(mpctx, "FPS forced to %5.3f.\n", d_video->fps);
MP_INFO(mpctx, "Use --no-correct-pts to force FPS based timing.\n");
}
#if HAVE_ENCODING
if (mpctx->encode_lavc_ctx && d_video)
encode_lavc_set_video_fps(mpctx->encode_lavc_ctx, d_video->fps);
#endif
vo_control(mpctx->video_out, VOCTRL_GET_HWDEC_INFO, &d_video->hwdec_info);
recreate_video_filters(mpctx);
if (!video_init_best_codec(d_video, opts->video_decoders))
goto err_out;
if (d_video->header->attached_picture && !decode_coverart(d_video))
goto err_out;
bool saver_state = opts->pause || !opts->stop_screensaver;
vo_control(mpctx->video_out, saver_state ? VOCTRL_RESTORE_SCREENSAVER
: VOCTRL_KILL_SCREENSAVER, NULL);
vo_set_paused(mpctx->video_out, mpctx->paused);
mpctx->sync_audio_to_video = !sh->attached_picture;
mpctx->vo_pts_history_seek_ts++;
// If we switch on video again, ensure audio position matches up.
if (mpctx->d_audio)
mpctx->audio_status = STATUS_SYNCING;
reset_video_state(mpctx);
reset_subtitle_state(mpctx);
return 1;
err_out:
no_video:
uninit_video_chain(mpctx);
if (track)
error_on_track(mpctx, track);
handle_force_window(mpctx, true);
return 0;
}
// Try to refresh the video by doing a precise seek to the currently displayed
// frame. This can go wrong in all sorts of ways, so use sparingly.
void mp_force_video_refresh(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
struct dec_video *d_video = mpctx->d_video;
if (!d_video || !d_video->decoder_output.imgfmt)
return;
// If not paused, the next frame should come soon enough.
if (opts->pause && mpctx->last_vo_pts != MP_NOPTS_VALUE) {
queue_seek(mpctx, MPSEEK_ABSOLUTE, mpctx->last_vo_pts,
MPSEEK_VERY_EXACT, true);
}
}
static int check_framedrop(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
// check for frame-drop:
if (mpctx->video_status == STATUS_PLAYING && !mpctx->paused &&
mpctx->audio_status == STATUS_PLAYING && !ao_untimed(mpctx->ao))
{
float fps = mpctx->d_video->fps;
double frame_time = fps > 0 ? 1.0 / fps : 0;
// we should avoid dropping too many frames in sequence unless we
// are too late. and we allow 100ms A-V delay here:
if (mpctx->last_av_difference - 0.100 > mpctx->dropped_frames * frame_time)
return !!(opts->frame_dropping & 2);
}
return 0;
}
static bool decode_coverart(struct dec_video *d_video)
{
d_video->cover_art_mpi =
video_decode(d_video, d_video->header->attached_picture, 0);
// Might need flush.
if (!d_video->cover_art_mpi)
d_video->cover_art_mpi = video_decode(d_video, NULL, 0);
return !!d_video->cover_art_mpi;
}
// Read a packet, store decoded image into d_video->waiting_decoded_mpi
// returns VD_* code
static int decode_image(struct MPContext *mpctx)
{
struct dec_video *d_video = mpctx->d_video;
if (d_video->header->attached_picture) {
d_video->waiting_decoded_mpi = mp_image_new_ref(d_video->cover_art_mpi);
return VD_EOF;
}
struct demux_packet *pkt;
if (demux_read_packet_async(d_video->header, &pkt) == 0)
return VD_WAIT;
if (pkt && pkt->pts != MP_NOPTS_VALUE)
pkt->pts += mpctx->video_offset;
if (pkt && pkt->dts != MP_NOPTS_VALUE)
pkt->dts += mpctx->video_offset;
if ((pkt && pkt->pts >= mpctx->hrseek_pts - .005) ||
d_video->has_broken_packet_pts ||
!mpctx->opts->hr_seek_framedrop)
{
mpctx->hrseek_framedrop = false;
}
bool hrseek = mpctx->hrseek_active && mpctx->video_status == STATUS_SYNCING;
int framedrop_type = hrseek && mpctx->hrseek_framedrop ?
2 : check_framedrop(mpctx);
d_video->waiting_decoded_mpi =
video_decode(d_video, pkt, framedrop_type);
bool had_packet = !!pkt;
talloc_free(pkt);
if (had_packet && !d_video->waiting_decoded_mpi &&
mpctx->video_status == STATUS_PLAYING &&
(mpctx->opts->frame_dropping & 2))
{
mpctx->dropped_frames_total++;
mpctx->dropped_frames++;
}
return had_packet ? VD_PROGRESS : VD_EOF;
}
// Called after video reinit. This can be generally used to try to insert more
// filters using the filter chain edit functionality in command.c.
static void init_filter_params(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
// Note that the filter chain is already initialized. This code might
// recreate the chain a second time, which is not very elegant, but allows
// us to test whether enabling deinterlacing works with the current video
// format and other filters.
if (opts->deinterlace >= 0)
mp_property_do("deinterlace", M_PROPERTY_SET, &opts->deinterlace, mpctx);
}
// Feed newly decoded frames to the filter, take care of format changes.
// If eof=true, drain the filter chain, and return VD_EOF if empty.
static int video_filter(struct MPContext *mpctx, bool eof)
{
struct dec_video *d_video = mpctx->d_video;
struct vf_chain *vf = d_video->vfilter;
if (vf->initialized < 0)
return VD_ERROR;
// There is already a filtered frame available.
// If vf_needs_input() returns > 0, the filter wants input anyway.
if (vf_output_frame(vf, eof) > 0 && vf_needs_input(vf) < 1)
return VD_PROGRESS;
// Decoder output is different from filter input?
bool need_vf_reconfig = !vf->input_params.imgfmt || vf->initialized < 1 ||
!mp_image_params_equal(&d_video->decoder_output, &vf->input_params);
// (If imgfmt==0, nothing was decoded yet, and the format is unknown.)
if (need_vf_reconfig && d_video->decoder_output.imgfmt) {
// Drain the filter chain.
if (vf_output_frame(vf, true) > 0)
return VD_PROGRESS;
// The filter chain is drained; execute the filter format change.
filter_reconfig(mpctx, false);
if (vf->initialized == 0)
return VD_PROGRESS; // hw decoding fallback; try again
if (vf->initialized < 1)
return VD_ERROR;
init_filter_params(mpctx);
return VD_RECONFIG;
}
// If something was decoded, and the filter chain is ready, filter it.
if (!need_vf_reconfig && d_video->waiting_decoded_mpi) {
vf_filter_frame(vf, d_video->waiting_decoded_mpi);
d_video->waiting_decoded_mpi = NULL;
return VD_PROGRESS;
}
return eof ? VD_EOF : VD_PROGRESS;
}
// Make sure at least 1 filtered image is available, decode new video if needed.
// returns VD_* code
// A return value of VD_PROGRESS doesn't necessarily output a frame, but makes
// the promise that calling this function again will eventually do something.
static int video_decode_and_filter(struct MPContext *mpctx)
{
struct dec_video *d_video = mpctx->d_video;
int r = video_filter(mpctx, false);
if (r < 0)
return r;
if (!d_video->waiting_decoded_mpi) {
// Decode a new image, or at least feed the decoder a packet.
r = decode_image(mpctx);
if (r == VD_WAIT)
return r;
if (d_video->waiting_decoded_mpi)
d_video->decoder_output = d_video->waiting_decoded_mpi->params;
}
bool eof = !d_video->waiting_decoded_mpi && (r == VD_EOF || r < 0);
r = video_filter(mpctx, eof);
if (r == VD_RECONFIG) // retry feeding decoded image
r = video_filter(mpctx, eof);
return r;
}
static int video_feed_async_filter(struct MPContext *mpctx)
{
struct dec_video *d_video = mpctx->d_video;
struct vf_chain *vf = d_video->vfilter;
if (vf->initialized < 0)
return VD_ERROR;
if (vf_needs_input(vf) < 1)
return 0;
mpctx->sleeptime = 0; // retry until done
return video_decode_and_filter(mpctx);
}
/* Modify video timing to match the audio timeline. There are two main
* reasons this is needed. First, video and audio can start from different
* positions at beginning of file or after a seek (MPlayer starts both
* immediately even if they have different pts). Second, the file can have
* audio timestamps that are inconsistent with the duration of the audio
* packets, for example two consecutive timestamp values differing by
* one second but only a packet with enough samples for half a second
* of playback between them.
*/
static void adjust_sync(struct MPContext *mpctx, double v_pts, double frame_time)
{
struct MPOpts *opts = mpctx->opts;
if (mpctx->audio_status != STATUS_PLAYING)
return;
double a_pts = written_audio_pts(mpctx) + opts->audio_delay - mpctx->delay;
double av_delay = a_pts - v_pts;
double change = av_delay * 0.1;
double max_change = opts->default_max_pts_correction >= 0 ?
opts->default_max_pts_correction : frame_time * 0.1;
if (change < -max_change)
change = -max_change;
else if (change > max_change)
change = max_change;
mpctx->delay += change;
mpctx->total_avsync_change += change;
}
// Move the frame in next_frame[1] to next_frame[0]. This makes the frame
// "known" to the playback logic. A frame in next_frame[0] is either "known" or
// NULL, so the moving must always be done by this function.
static void shift_new_frame(struct MPContext *mpctx)
{
if (mpctx->next_frame[0] || !mpctx->next_frame[1])
return;
mpctx->next_frame[0] = mpctx->next_frame[1];
mpctx->next_frame[1] = NULL;
double frame_time = 0;
double pts = mpctx->next_frame[0]->pts;
if (mpctx->video_pts != MP_NOPTS_VALUE) {
frame_time = pts - mpctx->video_pts;
double tolerance = 15;
if (mpctx->demuxer->ts_resets_possible) {
// Fortunately no real framerate is likely to go below this. It
// still could be that the file is VFR, but the demuxer reports a
// higher rate, so account for the case of e.g. 60hz demuxer fps
// but 23hz actual fps.
double fps = 23.976;
if (mpctx->d_video->fps > 0 && mpctx->d_video->fps < fps)
fps = mpctx->d_video->fps;
tolerance = 3 * 1.0 / fps;
}
if (frame_time <= 0 || frame_time >= tolerance) {
// Assume a discontinuity.
MP_WARN(mpctx, "Invalid video timestamp: %f -> %f\n",
mpctx->video_pts, pts);
frame_time = 0;
mpctx->audio_status = STATUS_SYNCING;
}
}
mpctx->video_next_pts = pts;
mpctx->delay -= frame_time;
if (mpctx->video_status >= STATUS_PLAYING) {
mpctx->time_frame += frame_time / mpctx->opts->playback_speed;
adjust_sync(mpctx, pts, frame_time);
}
mpctx->dropped_frames = 0;
MP_TRACE(mpctx, "frametime=%5.3f\n", frame_time);
}
// Whether it's fine to call add_new_frame() now.
static bool needs_new_frame(struct MPContext *mpctx)
{
return !mpctx->next_frame[1];
}
// Queue a frame to mpctx->next_frame[]. Call only if needs_new_frame() signals ok.
static void add_new_frame(struct MPContext *mpctx, struct mp_image *frame)
{
assert(needs_new_frame(mpctx));
assert(frame);
mpctx->next_frame[1] = frame;
shift_new_frame(mpctx);
}
// Enough video filtered already to push one frame to the VO?
// Set eof to true if no new frames are to be expected.
static bool have_new_frame(struct MPContext *mpctx, bool eof)
{
bool need_2nd = !!(mpctx->opts->frame_dropping & 1) // we need the duration
&& mpctx->video_pts != MP_NOPTS_VALUE // ...except for the 1st frame
&& !eof; // on EOF, drain the remaining frames
return mpctx->next_frame[0] && (!need_2nd || mpctx->next_frame[1]);
}
// Fill mpctx->next_frame[] with a newly filtered or decoded image.
// returns VD_* code
static int video_output_image(struct MPContext *mpctx, double endpts)
{
bool hrseek = mpctx->hrseek_active && mpctx->video_status == STATUS_SYNCING;
if (mpctx->d_video->header->attached_picture) {
if (vo_has_frame(mpctx->video_out))
return VD_EOF;
if (mpctx->next_frame[0])
return VD_NEW_FRAME;
int r = video_decode_and_filter(mpctx);
video_filter(mpctx, true); // force EOF filtering (avoid decoding more)
mpctx->next_frame[0] = vf_read_output_frame(mpctx->d_video->vfilter);
if (mpctx->next_frame[0])
mpctx->next_frame[0]->pts = MP_NOPTS_VALUE;
return r <= 0 ? VD_EOF : VD_PROGRESS;
}
if (have_new_frame(mpctx, false))
return VD_NEW_FRAME;
// Get a new frame if we need one.
int r = VD_PROGRESS;
if (needs_new_frame(mpctx)) {
// Filter a new frame.
r = video_decode_and_filter(mpctx);
if (r < 0)
return r; // error
struct mp_image *img = vf_read_output_frame(mpctx->d_video->vfilter);
if (img) {
// Always add these; they make backstepping after seeking faster.
add_frame_pts(mpctx, img->pts);
if (endpts != MP_NOPTS_VALUE && img->pts >= endpts) {
r = VD_EOF;
} else if (mpctx->max_frames == 0) {
r = VD_EOF;
} else if (hrseek && mpctx->hrseek_lastframe) {
mp_image_setrefp(&mpctx->saved_frame, img);
} else if (hrseek && img->pts < mpctx->hrseek_pts - .005) {
/* just skip */
} else {
add_new_frame(mpctx, img);
img = NULL;
}
talloc_free(img);
}
}
// Last-frame seek
if (r <= 0 && hrseek && mpctx->hrseek_lastframe && mpctx->saved_frame) {
add_new_frame(mpctx, mpctx->saved_frame);
mpctx->saved_frame = NULL;
r = VD_PROGRESS;
}
return have_new_frame(mpctx, r <= 0) ? VD_NEW_FRAME : r;
}
/* Update avsync before a new video frame is displayed. Actually, this can be
* called arbitrarily often before the actual display.
* This adjusts the time of the next video frame */
static void update_avsync_before_frame(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
struct vo *vo = mpctx->video_out;
if (!mpctx->sync_audio_to_video || mpctx->video_status < STATUS_READY) {
mpctx->time_frame = 0;
} else if (mpctx->audio_status == STATUS_PLAYING &&
mpctx->video_status == STATUS_PLAYING &&
!ao_untimed(mpctx->ao))
{
double buffered_audio = ao_get_delay(mpctx->ao);
double predicted = mpctx->delay / opts->playback_speed +
mpctx->time_frame;
double difference = buffered_audio - predicted;
MP_STATS(mpctx, "value %f audio-diff", difference);
if (opts->autosync) {
/* Smooth reported playback position from AO by averaging
* it with the value expected based on previus value and
* time elapsed since then. May help smooth video timing
* with audio output that have inaccurate position reporting.
* This is badly implemented; the behavior of the smoothing
* now undesirably depends on how often this code runs
* (mainly depends on video frame rate). */
buffered_audio = predicted + difference / opts->autosync;
}
mpctx->time_frame = buffered_audio - mpctx->delay / opts->playback_speed;
} else {
/* If we're more than 200 ms behind the right playback
* position, don't try to speed up display of following
* frames to catch up; continue with default speed from
* the current frame instead.
* If untimed is set always output frames immediately
* without sleeping.
*/
if (mpctx->time_frame < -0.2 || opts->untimed || vo->driver->untimed)
mpctx->time_frame = 0;
}
}
// Update the A/V sync difference after a video frame has been shown.
static void update_avsync_after_frame(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
mpctx->last_av_difference = 0;
if (mpctx->audio_status != STATUS_PLAYING ||
mpctx->video_status != STATUS_PLAYING)
return;
double a_pos = playing_audio_pts(mpctx);
mpctx->last_av_difference = a_pos - mpctx->video_pts + opts->audio_delay;
if (mpctx->time_frame > 0)
mpctx->last_av_difference += mpctx->time_frame * opts->playback_speed;
if (a_pos == MP_NOPTS_VALUE || mpctx->video_pts == MP_NOPTS_VALUE) {
mpctx->last_av_difference = 0;
} else if (fabs(mpctx->last_av_difference) > 0.5 && !mpctx->drop_message_shown) {
MP_WARN(mpctx, "%s", av_desync_help_text);
mpctx->drop_message_shown = true;
}
}
static void init_vo(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
struct dec_video *d_video = mpctx->d_video;
if (opts->gamma_gamma != 1000)
video_set_colors(d_video, "gamma", opts->gamma_gamma);
if (opts->gamma_brightness != 1000)
video_set_colors(d_video, "brightness", opts->gamma_brightness);
if (opts->gamma_contrast != 1000)
video_set_colors(d_video, "contrast", opts->gamma_contrast);
if (opts->gamma_saturation != 1000)
video_set_colors(d_video, "saturation", opts->gamma_saturation);
if (opts->gamma_hue != 1000)
video_set_colors(d_video, "hue", opts->gamma_hue);
mp_notify(mpctx, MPV_EVENT_VIDEO_RECONFIG, NULL);
}
void write_video(struct MPContext *mpctx, double endpts)
{
struct MPOpts *opts = mpctx->opts;
struct vo *vo = mpctx->video_out;
if (!mpctx->d_video)
return;
// Actual playback starts when both audio and video are ready.
if (mpctx->video_status == STATUS_READY)
return;
if (mpctx->paused && mpctx->video_status >= STATUS_READY)
return;
int r = video_output_image(mpctx, endpts);
MP_TRACE(mpctx, "video_output_image: %d\n", r);
if (r < 0)
goto error;
if (r == VD_WAIT) // Demuxer will wake us up for more packets to decode.
return;
if (r == VD_EOF) {
mpctx->video_status =
vo_still_displaying(vo) ? STATUS_DRAINING : STATUS_EOF;
mpctx->delay = 0;
mpctx->last_av_difference = 0;
MP_DBG(mpctx, "video EOF (status=%d)\n", mpctx->video_status);
return;
}
if (mpctx->video_status > STATUS_PLAYING)
mpctx->video_status = STATUS_PLAYING;
if (r != VD_NEW_FRAME) {
mpctx->sleeptime = 0; // Decode more in next iteration.
return;
}
// Filter output is different from VO input?
struct mp_image_params p = mpctx->next_frame[0]->params;
if (!vo->params || !mp_image_params_equal(&p, vo->params)) {
// Changing config deletes the current frame; wait until it's finished.
if (vo_still_displaying(vo))
return;
const struct vo_driver *info = mpctx->video_out->driver;
char extra[20] = {0};
if (p.w != p.d_w || p.h != p.d_h)
snprintf(extra, sizeof(extra), " => %dx%d", p.d_w, p.d_h);
MP_INFO(mpctx, "VO: [%s] %dx%d%s %s\n",
info->name, p.w, p.h, extra, vo_format_name(p.imgfmt));
MP_VERBOSE(mpctx, "VO: Description: %s\n", info->description);
int vo_r = vo_reconfig(vo, &p, 0);
if (vo_r < 0) {
mpctx->error_playing = MPV_ERROR_VO_INIT_FAILED;
goto error;
}
init_vo(mpctx);
}
mpctx->time_frame -= get_relative_time(mpctx);
update_avsync_before_frame(mpctx);
double time_frame = MPMAX(mpctx->time_frame, -1);
int64_t pts = mp_time_us() + (int64_t)(time_frame * 1e6);
// wait until VO wakes us up to get more frames
if (!vo_is_ready_for_frame(vo, pts)) {
if (video_feed_async_filter(mpctx) < 0)
goto error;
return;
}
int64_t duration = -1;
double diff = -1;
double vpts0 = mpctx->next_frame[0] ? mpctx->next_frame[0]->pts : MP_NOPTS_VALUE;
double vpts1 = mpctx->next_frame[1] ? mpctx->next_frame[1]->pts : MP_NOPTS_VALUE;
if (vpts0 != MP_NOPTS_VALUE && vpts1 != MP_NOPTS_VALUE)
diff = vpts1 - vpts0;
if (diff < 0 && mpctx->d_video->fps > 0)
diff = 1.0 / mpctx->d_video->fps; // fallback to demuxer-reported fps
if (opts->untimed || vo->driver->untimed)
diff = -1; // disable frame dropping and aspects of frame timing
if (diff >= 0) {
// expected A/V sync correction is ignored
diff /= opts->playback_speed;
if (mpctx->time_frame < 0)
diff += mpctx->time_frame;
duration = MPCLAMP(diff, 0, 10) * 1e6;
}
mpctx->video_pts = mpctx->next_frame[0]->pts;
mpctx->last_vo_pts = mpctx->video_pts;
mpctx->playback_pts = mpctx->video_pts;
update_avsync_after_frame(mpctx);
mpctx->osd_force_update = true;
update_osd_msg(mpctx);
update_subtitles(mpctx);
vo_queue_frame(vo, mpctx->next_frame[0], pts, duration);
mpctx->next_frame[0] = NULL;
shift_new_frame(mpctx);
mpctx->shown_vframes++;
if (mpctx->video_status < STATUS_PLAYING) {
mpctx->video_status = STATUS_READY;
// After a seek, make sure to wait until the first frame is visible.
vo_wait_frame(vo);
MP_VERBOSE(mpctx, "first video frame after restart shown\n");
}
screenshot_flip(mpctx);
mp_notify(mpctx, MPV_EVENT_TICK, NULL);
if (!mpctx->sync_audio_to_video)
mpctx->video_status = STATUS_EOF;
if (mpctx->video_status != STATUS_EOF) {
if (mpctx->step_frames > 0) {
mpctx->step_frames--;
if (!mpctx->step_frames && !opts->pause)
pause_player(mpctx);
}
if (mpctx->max_frames == 0)
mpctx->stop_play = AT_END_OF_FILE;
if (mpctx->max_frames > 0)
mpctx->max_frames--;
}
mpctx->sleeptime = 0;
return;
error:
MP_FATAL(mpctx, "Could not initialize video chain.\n");
uninit_video_chain(mpctx);
error_on_track(mpctx, mpctx->current_track[STREAM_VIDEO][0]);
handle_force_window(mpctx, true);
mpctx->sleeptime = 0;
}
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