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mpv/video/decode/dec_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 <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <libavutil/rational.h>
#include "config.h"
#include "options/options.h"
#include "common/msg.h"
#include "osdep/timer.h"
#include "stream/stream.h"
#include "demux/demux.h"
#include "demux/packet.h"
#include "common/codecs.h"
#include "video/out/vo.h"
#include "video/csputils.h"
#include "demux/stheader.h"
#include "video/decode/vd.h"
#include "video/decode/dec_video.h"
extern const vd_functions_t mpcodecs_vd_ffmpeg;
/* Please do not add any new decoders here. If you want to implement a new
* decoder, add it to libavcodec, except for wrappers around external
* libraries and decoders requiring binary support. */
const vd_functions_t * const mpcodecs_vd_drivers[] = {
&mpcodecs_vd_ffmpeg,
/* Please do not add any new decoders here. If you want to implement a new
* decoder, add it to libavcodec, except for wrappers around external
* libraries and decoders requiring binary support. */
NULL
};
void video_reset(struct dec_video *d_video)
{
video_vd_control(d_video, VDCTRL_RESET, NULL);
d_video->num_buffered_pts = 0;
d_video->first_packet_pdts = MP_NOPTS_VALUE;
d_video->start_pts = MP_NOPTS_VALUE;
d_video->decoded_pts = MP_NOPTS_VALUE;
d_video->codec_pts = MP_NOPTS_VALUE;
d_video->codec_dts = MP_NOPTS_VALUE;
d_video->last_format = d_video->fixed_format = (struct mp_image_params){0};
d_video->dropped_frames = 0;
d_video->current_state = VIDEO_SKIP;
mp_image_unrefp(&d_video->current_mpi);
}
int video_vd_control(struct dec_video *d_video, int cmd, void *arg)
{
const struct vd_functions *vd = d_video->vd_driver;
if (vd)
return vd->control(d_video, cmd, arg);
return CONTROL_UNKNOWN;
}
void video_uninit(struct dec_video *d_video)
{
mp_image_unrefp(&d_video->current_mpi);
mp_image_unrefp(&d_video->cover_art_mpi);
if (d_video->vd_driver) {
MP_VERBOSE(d_video, "Uninit video.\n");
d_video->vd_driver->uninit(d_video);
}
talloc_free(d_video);
}
static int init_video_codec(struct dec_video *d_video, const char *decoder)
{
if (!d_video->vd_driver->init(d_video, decoder)) {
MP_VERBOSE(d_video, "Video decoder init failed.\n");
return 0;
}
return 1;
}
struct mp_decoder_list *video_decoder_list(void)
{
struct mp_decoder_list *list = talloc_zero(NULL, struct mp_decoder_list);
for (int i = 0; mpcodecs_vd_drivers[i] != NULL; i++)
mpcodecs_vd_drivers[i]->add_decoders(list);
return list;
}
static struct mp_decoder_list *mp_select_video_decoders(const char *codec,
char *selection)
{
struct mp_decoder_list *list = video_decoder_list();
struct mp_decoder_list *new = mp_select_decoders(list, codec, selection);
talloc_free(list);
return new;
}
static const struct vd_functions *find_driver(const char *name)
{
for (int i = 0; mpcodecs_vd_drivers[i] != NULL; i++) {
if (strcmp(mpcodecs_vd_drivers[i]->name, name) == 0)
return mpcodecs_vd_drivers[i];
}
return NULL;
}
bool video_init_best_codec(struct dec_video *d_video, char* video_decoders)
{
assert(!d_video->vd_driver);
video_reset(d_video);
d_video->has_broken_packet_pts = -10; // needs 10 packets to reach decision
struct mp_decoder_entry *decoder = NULL;
struct mp_decoder_list *list =
mp_select_video_decoders(d_video->header->codec->codec, video_decoders);
mp_print_decoders(d_video->log, MSGL_V, "Codec list:", list);
for (int n = 0; n < list->num_entries; n++) {
struct mp_decoder_entry *sel = &list->entries[n];
const struct vd_functions *driver = find_driver(sel->family);
if (!driver)
continue;
MP_VERBOSE(d_video, "Opening video decoder %s:%s\n",
sel->family, sel->decoder);
d_video->vd_driver = driver;
if (init_video_codec(d_video, sel->decoder)) {
decoder = sel;
break;
}
d_video->vd_driver = NULL;
MP_WARN(d_video, "Video decoder init failed for "
"%s:%s\n", sel->family, sel->decoder);
}
if (d_video->vd_driver) {
d_video->decoder_desc =
talloc_asprintf(d_video, "%s [%s:%s]", decoder->desc, decoder->family,
decoder->decoder);
MP_VERBOSE(d_video, "Selected video codec: %s\n", d_video->decoder_desc);
} else {
MP_ERR(d_video, "Failed to initialize a video decoder for codec '%s'.\n",
d_video->header->codec->codec);
}
if (d_video->header->missing_timestamps) {
MP_WARN(d_video, "This stream has no timestamps!\n");
MP_WARN(d_video, "Making up playback time using %f FPS.\n", d_video->fps);
MP_WARN(d_video, "Seeking will probably fail badly.\n");
}
talloc_free(list);
return !!d_video->vd_driver;
}
static void fix_image_params(struct dec_video *d_video,
struct mp_image_params *params)
{
struct MPOpts *opts = d_video->opts;
struct mp_image_params p = *params;
struct mp_codec_params *c = d_video->header->codec;
MP_VERBOSE(d_video, "Decoder format: %s\n", mp_image_params_to_str(params));
// While mp_image_params normally always have to have d_w/d_h set, the
// decoder signals unknown bitstream aspect ratio with both set to 0.
float dec_aspect = p.p_w > 0 && p.p_h > 0 ? p.p_w / (float)p.p_h : 0;
if (d_video->initial_decoder_aspect == 0)
d_video->initial_decoder_aspect = dec_aspect;
bool use_container = true;
switch (opts->aspect_method) {
case 0:
// We normally prefer the container aspect, unless the decoder aspect
// changes at least once.
if (dec_aspect > 0 && d_video->initial_decoder_aspect != dec_aspect) {
MP_VERBOSE(d_video, "Using bitstream aspect ratio.\n");
// Even if the aspect switches back, don't use container aspect again.
d_video->initial_decoder_aspect = -1;
use_container = false;
}
break;
case 1:
use_container = false;
break;
}
if (use_container && c->par_w > 0 && c->par_h) {
MP_VERBOSE(d_video, "Using container aspect ratio.\n");
p.p_w = c->par_w;
p.p_h = c->par_h;
}
if (opts->movie_aspect >= 0) {
MP_VERBOSE(d_video, "Forcing user-set aspect ratio.\n");
if (opts->movie_aspect == 0) {
p.p_w = p.p_h = 1;
} else {
AVRational a = av_d2q(opts->movie_aspect, INT_MAX);
mp_image_params_set_dsize(&p, a.num, a.den);
}
}
// Assume square pixels if no aspect ratio is set at all.
if (p.p_w <= 0 || p.p_h <= 0)
p.p_w = p.p_h = 1;
// Detect colorspace from resolution.
mp_image_params_guess_csp(&p);
d_video->last_format = *params;
d_video->fixed_format = p;
}
static void add_avi_pts(struct dec_video *d_video, double pts)
{
if (pts != MP_NOPTS_VALUE) {
int delay = -1;
video_vd_control(d_video, VDCTRL_QUERY_UNSEEN_FRAMES, &delay);
if (delay >= 0 && delay < d_video->num_buffered_pts)
d_video->num_buffered_pts = delay;
if (d_video->num_buffered_pts == MP_ARRAY_SIZE(d_video->buffered_pts)) {
MP_ERR(d_video, "Too many buffered pts\n");
} else {
for (int i = d_video->num_buffered_pts; i > 0; i--)
d_video->buffered_pts[i] = d_video->buffered_pts[i - 1];
d_video->buffered_pts[0] = pts;
d_video->num_buffered_pts++;
}
}
}
static double retrieve_avi_pts(struct dec_video *d_video, double codec_pts)
{
if (d_video->num_buffered_pts) {
d_video->num_buffered_pts--;
return d_video->buffered_pts[d_video->num_buffered_pts];
}
MP_ERR(d_video, "No pts value from demuxer to use for frame!\n");
return MP_NOPTS_VALUE;
}
static struct mp_image *decode_packet(struct dec_video *d_video,
struct demux_packet *packet,
int drop_frame)
{
struct MPOpts *opts = d_video->opts;
bool avi_pts = d_video->header->codec->avi_dts && opts->correct_pts;
struct demux_packet packet_copy;
if (packet && packet->dts == MP_NOPTS_VALUE) {
packet_copy = *packet;
packet = &packet_copy;
packet->dts = packet->pts;
}
double pkt_pts = packet ? packet->pts : MP_NOPTS_VALUE;
double pkt_dts = packet ? packet->dts : MP_NOPTS_VALUE;
double pkt_pdts = pkt_pts == MP_NOPTS_VALUE ? pkt_dts : pkt_pts;
if (pkt_pdts != MP_NOPTS_VALUE && d_video->first_packet_pdts == MP_NOPTS_VALUE)
d_video->first_packet_pdts = pkt_pdts;
if (avi_pts)
add_avi_pts(d_video, pkt_pdts);
double prev_codec_pts = d_video->codec_pts;
double prev_codec_dts = d_video->codec_dts;
if (d_video->header->codec->avi_dts)
drop_frame = 0;
MP_STATS(d_video, "start decode video");
struct mp_image *mpi = d_video->vd_driver->decode(d_video, packet, drop_frame);
MP_STATS(d_video, "end decode video");
if (!mpi || drop_frame) {
talloc_free(mpi);
return NULL; // error / skipped frame
}
if (opts->field_dominance == 0) {
mpi->fields |= MP_IMGFIELD_TOP_FIRST | MP_IMGFIELD_INTERLACED;
} else if (opts->field_dominance == 1) {
mpi->fields &= ~MP_IMGFIELD_TOP_FIRST;
mpi->fields |= MP_IMGFIELD_INTERLACED;
}
// Note: the PTS is reordered, but the DTS is not. Both should be monotonic.
double pts = d_video->codec_pts;
double dts = d_video->codec_dts;
if (pts == MP_NOPTS_VALUE) {
d_video->codec_pts = prev_codec_pts;
} else if (pts < prev_codec_pts) {
d_video->num_codec_pts_problems++;
}
if (dts == MP_NOPTS_VALUE) {
d_video->codec_dts = prev_codec_dts;
} else if (dts <= prev_codec_dts) {
d_video->num_codec_dts_problems++;
}
// If PTS is unset, or non-monotonic, fall back to DTS.
if ((d_video->num_codec_pts_problems > d_video->num_codec_dts_problems ||
pts == MP_NOPTS_VALUE) && dts != MP_NOPTS_VALUE)
pts = dts;
// Alternative PTS determination methods
if (avi_pts)
pts = retrieve_avi_pts(d_video, pts);
if (!opts->correct_pts || pts == MP_NOPTS_VALUE) {
if (opts->correct_pts && !d_video->header->missing_timestamps)
MP_WARN(d_video, "No video PTS! Making something up.\n");
double frame_time = 1.0f / (d_video->fps > 0 ? d_video->fps : 25);
double base = d_video->first_packet_pdts;
pts = d_video->decoded_pts;
if (pts == MP_NOPTS_VALUE) {
pts = base == MP_NOPTS_VALUE ? 0 : base;
} else {
pts += frame_time;
}
}
if (d_video->has_broken_packet_pts < 0)
d_video->has_broken_packet_pts++;
if (d_video->num_codec_pts_problems || pkt_pts == MP_NOPTS_VALUE)
d_video->has_broken_packet_pts = 1;
if (!mp_image_params_equal(&d_video->last_format, &mpi->params))
fix_image_params(d_video, &mpi->params);
mpi->params = d_video->fixed_format;
mpi->pts = pts;
d_video->decoded_pts = pts;
return mpi;
}
void video_reset_aspect(struct dec_video *d_video)
{
d_video->last_format = (struct mp_image_params){0};
}
void video_set_framedrop(struct dec_video *d_video, bool enabled)
{
d_video->framedrop_enabled = enabled;
}
// Frames before the start timestamp can be dropped. (Used for hr-seek.)
void video_set_start(struct dec_video *d_video, double start_pts)
{
d_video->start_pts = start_pts;
}
void video_work(struct dec_video *d_video)
{
if (d_video->current_mpi)
return;
if (d_video->header->attached_picture) {
if (d_video->current_state == VIDEO_SKIP && !d_video->cover_art_mpi) {
d_video->cover_art_mpi =
decode_packet(d_video, d_video->header->attached_picture, 0);
// Might need flush.
if (!d_video->cover_art_mpi)
d_video->cover_art_mpi = decode_packet(d_video, NULL, 0);
d_video->current_state = VIDEO_OK;
}
if (d_video->current_state == VIDEO_OK)
d_video->current_mpi = mp_image_new_ref(d_video->cover_art_mpi);
// (VIDEO_OK is returned the first time, when current_mpi is sill set)
d_video->current_state = VIDEO_EOF;
return;
}
struct demux_packet *pkt;
if (demux_read_packet_async(d_video->header, &pkt) == 0) {
d_video->current_state = VIDEO_WAIT;
return;
}
int framedrop_type = d_video->framedrop_enabled ? 1 : 0;
if (d_video->start_pts != MP_NOPTS_VALUE && pkt &&
pkt->pts < d_video->start_pts - .005 &&
!d_video->has_broken_packet_pts)
{
framedrop_type = 2;
}
d_video->current_mpi = decode_packet(d_video, pkt, framedrop_type);
bool had_packet = !!pkt;
talloc_free(pkt);
d_video->current_state = VIDEO_OK;
if (!d_video->current_mpi) {
d_video->current_state = VIDEO_EOF;
if (had_packet) {
if (framedrop_type == 1)
d_video->dropped_frames += 1;
d_video->current_state = VIDEO_SKIP;
}
}
}
// Fetch an image decoded with video_work(). Returns one of:
// VIDEO_OK: *out_mpi is set to a new image
// VIDEO_WAIT: waiting for demuxer; will receive a wakeup signal
// VIDEO_EOF: end of file, no more frames to be expected
// VIDEO_SKIP: dropped frame or something similar
int video_get_frame(struct dec_video *d_video, struct mp_image **out_mpi)
{
*out_mpi = NULL;
if (d_video->current_mpi) {
*out_mpi = d_video->current_mpi;
d_video->current_mpi = NULL;
return VIDEO_OK;
}
if (d_video->current_state == VIDEO_OK)
return VIDEO_SKIP;
return d_video->current_state;
}
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