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Until now (and in mplayer traditionally), avi timestamps were handled
with a timestamp FIFO. AVI timestamps are essentially just strictly
increasing frame numbers and are not reordered like normal timestamps.
Limiting the FIFO is required because frames can be dropped. To make
it worse, frame dropping can't be distinguished from the decoder not
returning output due to increasing the buffering required for B-frames.
("Measuring" the buffering at playback start seems like an interesting
idea, but won't work as the buffering could be increased mid-playback.)
Another problem are skipped frames (packets with data, but which do
not contain a video frame).
Besides dropped and skipped frames, there is the problem that we can't
always know the delay. External decoders like MMAL are not going to
tell us. (And later perhaps others, like direct VideoToolbox usage.)
In general, this works not-well enough that I prefer the solution of
passing through AVI timestamps as DTS. This is slightly incorrect,
because most decoders treat DTS as mpeg-style timestamps, which
already include a b-frame delay, and thus will be shifted by a few
frames. This means there will be a problem with A/V sync in some
situations.
Note that the FFmpeg AVI demuxer shifts timestamps by an additional
amount (which increases after the first seek!?!?), which makes the
situation worse. It works well with VfW-muxed Matroska files, though.
On RPI, the first X timestamps are broken until the MMAL decoder "locks
on".
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MPLAYER_VD_H
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#define MPLAYER_VD_H
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#include "video/mp_image.h"
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#include "demux/stheader.h"
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#include "dec_video.h"
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struct demux_packet;
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struct mp_decoder_list;
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/* interface of video decoder drivers */
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typedef struct vd_functions
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{
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const char *name;
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void (*add_decoders)(struct mp_decoder_list *list);
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int (*init)(struct dec_video *vd, const char *decoder);
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void (*uninit)(struct dec_video *vd);
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int (*control)(struct dec_video *vd, int cmd, void *arg);
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struct mp_image *(*decode)(struct dec_video *vd, struct demux_packet *pkt,
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int flags);
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} vd_functions_t;
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// NULL terminated array of all drivers
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extern const vd_functions_t *const mpcodecs_vd_drivers[];
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enum vd_ctrl {
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VDCTRL_RESET = 1, // reset decode state after seeking
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VDCTRL_FORCE_HWDEC_FALLBACK, // force software decoding fallback
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VDCTRL_GET_HWDEC,
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VDCTRL_REINIT,
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VDCTRL_GET_BFRAMES,
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};
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#endif /* MPLAYER_VD_H */
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