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mpv/video/out/vo_lavc.c
wm4 68b7217d41 vo_vdpau: better integration with the generic framedrop code 
vo_vdpau uses its own framedrop code, mostly for historic reasons. It
has some tricky heuristics, of which I'm not sure how they work, or if
they have any effect at all, but in any case, I want to keep this code
for now. One day it might get fully ported to the vo.c framedrop code,
or just removed.

But improve its interaction with the user-visible framedrop controls.
Make --framedrop actually enable and disable the vo_vdpau framedrop
code, and increment the number of dropped frames correctly.

The code path for other VOs should be equivalent. The vo_vdpau behavior
should, except for the improvements mentioned above, be mostly
equivalent as well. One minor change is that frames "shown" during
preemption are always count as dropped.

Remove the statement from the manpage that vo_vdpau is the default; this
hasn't been the case for a while.
2014-09-20 15:17:12 +02:00

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/*
* video encoding using libavformat
* Copyright (C) 2010 Nicolas George <george@nsup.org>
* Copyright (C) 2011-2012 Rudolf Polzer <divVerent@xonotic.org>
*
* This file is part of mpv.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include "common/common.h"
#include "options/options.h"
#include "video/fmt-conversion.h"
#include "video/mp_image.h"
#include "video/vfcap.h"
#include "talloc.h"
#include "vo.h"
#include "common/encode_lavc.h"
#include "sub/osd.h"
struct priv {
uint8_t *buffer;
size_t buffer_size;
AVStream *stream;
int have_first_packet;
int harddup;
double lastpts;
int64_t lastipts;
int64_t lastframeipts;
int64_t lastencodedipts;
int64_t mindeltapts;
double expected_next_pts;
mp_image_t *lastimg;
int lastimg_wants_osd;
int lastdisplaycount;
AVRational worst_time_base;
int worst_time_base_is_stream;
struct mp_image_params real_colorspace;
};
static int preinit(struct vo *vo)
{
struct priv *vc;
if (!encode_lavc_available(vo->encode_lavc_ctx)) {
MP_ERR(vo, "the option --o (output file) must be specified\n");
return -1;
}
vo->priv = talloc_zero(vo, struct priv);
vc = vo->priv;
vc->harddup = vo->encode_lavc_ctx->options->harddup;
return 0;
}
static void draw_image_unlocked(struct vo *vo, mp_image_t *mpi);
static void uninit(struct vo *vo)
{
struct priv *vc = vo->priv;
if (!vc)
return;
pthread_mutex_lock(&vo->encode_lavc_ctx->lock);
if (vc->lastipts >= 0 && vc->stream)
draw_image_unlocked(vo, NULL);
mp_image_unrefp(&vc->lastimg);
pthread_mutex_unlock(&vo->encode_lavc_ctx->lock);
}
static int reconfig(struct vo *vo, struct mp_image_params *params, int flags)
{
struct priv *vc = vo->priv;
enum AVPixelFormat pix_fmt = imgfmt2pixfmt(params->imgfmt);
AVRational display_aspect_ratio, image_aspect_ratio;
AVRational aspect;
uint32_t width = params->w;
uint32_t height = params->h;
if (!vc)
return -1;
pthread_mutex_lock(&vo->encode_lavc_ctx->lock);
display_aspect_ratio.num = params->d_w;
display_aspect_ratio.den = params->d_h;
image_aspect_ratio.num = width;
image_aspect_ratio.den = height;
aspect = av_div_q(display_aspect_ratio, image_aspect_ratio);
if (vc->stream) {
/* NOTE:
* in debug builds we get a "comparison between signed and unsigned"
* warning here. We choose to ignore that; just because ffmpeg currently
* uses a plain 'int' for these struct fields, it doesn't mean it always
* will */
if (width == vc->stream->codec->width &&
height == vc->stream->codec->height) {
if (aspect.num != vc->stream->codec->sample_aspect_ratio.num ||
aspect.den != vc->stream->codec->sample_aspect_ratio.den) {
/* aspect-only changes are not critical */
MP_WARN(vo, "unsupported pixel aspect ratio change from %d:%d to %d:%d\n",
vc->stream->codec->sample_aspect_ratio.num,
vc->stream->codec->sample_aspect_ratio.den,
aspect.num, aspect.den);
}
goto done;
}
/* FIXME Is it possible with raw video? */
MP_ERR(vo, "resolution changes not supported.\n");
goto error;
}
vc->lastipts = AV_NOPTS_VALUE;
vc->lastframeipts = AV_NOPTS_VALUE;
vc->lastencodedipts = AV_NOPTS_VALUE;
if (pix_fmt == AV_PIX_FMT_NONE) {
MP_FATAL(vo, "Format %s not supported by lavc.\n",
mp_imgfmt_to_name(params->imgfmt));
goto error;
}
vc->stream = encode_lavc_alloc_stream(vo->encode_lavc_ctx,
AVMEDIA_TYPE_VIDEO);
vc->stream->sample_aspect_ratio = vc->stream->codec->sample_aspect_ratio =
aspect;
vc->stream->codec->width = width;
vc->stream->codec->height = height;
vc->stream->codec->pix_fmt = pix_fmt;
encode_lavc_set_csp(vo->encode_lavc_ctx, vc->stream, params->colorspace);
encode_lavc_set_csp_levels(vo->encode_lavc_ctx, vc->stream, params->colorlevels);
if (encode_lavc_open_codec(vo->encode_lavc_ctx, vc->stream) < 0)
goto error;
vc->real_colorspace.colorspace =
encode_lavc_get_csp(vo->encode_lavc_ctx, vc->stream);
vc->real_colorspace.colorlevels =
encode_lavc_get_csp_levels(vo->encode_lavc_ctx, vc->stream);
vc->buffer_size = 6 * width * height + 200;
if (vc->buffer_size < FF_MIN_BUFFER_SIZE)
vc->buffer_size = FF_MIN_BUFFER_SIZE;
if (vc->buffer_size < sizeof(AVPicture))
vc->buffer_size = sizeof(AVPicture);
vc->buffer = talloc_size(vc, vc->buffer_size);
mp_image_unrefp(&vc->lastimg);
done:
pthread_mutex_unlock(&vo->encode_lavc_ctx->lock);
return 0;
error:
pthread_mutex_unlock(&vo->encode_lavc_ctx->lock);
uninit(vo);
return -1;
}
static int query_format(struct vo *vo, uint32_t format)
{
enum AVPixelFormat pix_fmt = imgfmt2pixfmt(format);
if (!vo->encode_lavc_ctx)
return 0;
pthread_mutex_lock(&vo->encode_lavc_ctx->lock);
int flags = 0;
if (encode_lavc_supports_pixfmt(vo->encode_lavc_ctx, pix_fmt))
flags = VFCAP_CSP_SUPPORTED | VFCAP_CSP_SUPPORTED_BY_HW;
pthread_mutex_unlock(&vo->encode_lavc_ctx->lock);
return flags;
}
static void write_packet(struct vo *vo, int size, AVPacket *packet)
{
struct priv *vc = vo->priv;
if (size < 0) {
MP_ERR(vo, "error encoding\n");
return;
}
if (size > 0) {
packet->stream_index = vc->stream->index;
if (packet->pts != AV_NOPTS_VALUE) {
packet->pts = av_rescale_q(packet->pts,
vc->stream->codec->time_base,
vc->stream->time_base);
} else {
MP_VERBOSE(vo, "codec did not provide pts\n");
packet->pts = av_rescale_q(vc->lastipts, vc->worst_time_base,
vc->stream->time_base);
}
if (packet->dts != AV_NOPTS_VALUE) {
packet->dts = av_rescale_q(packet->dts,
vc->stream->codec->time_base,
vc->stream->time_base);
}
if (packet->duration > 0) {
packet->duration = av_rescale_q(packet->duration,
vc->stream->codec->time_base,
vc->stream->time_base);
} else {
// HACK: libavformat calculates dts wrong if the initial packet
// duration is not set, but ONLY if the time base is "high" and if we
// have b-frames!
if (!packet->duration)
if (!vc->have_first_packet)
if (vc->stream->codec->has_b_frames
|| vc->stream->codec->max_b_frames)
if (vc->stream->time_base.num * 1000LL <=
vc->stream->time_base.den)
packet->duration = FFMAX(1, av_rescale_q(1,
vc->stream->codec->time_base, vc->stream->time_base));
}
if (encode_lavc_write_frame(vo->encode_lavc_ctx, packet) < 0) {
MP_ERR(vo, "error writing\n");
return;
}
vc->have_first_packet = 1;
}
}
static int encode_video(struct vo *vo, AVFrame *frame, AVPacket *packet)
{
struct priv *vc = vo->priv;
if (encode_lavc_oformat_flags(vo->encode_lavc_ctx) & AVFMT_RAWPICTURE) {
if (!frame)
return 0;
memcpy(vc->buffer, frame, sizeof(AVPicture));
MP_DBG(vo, "got pts %f\n",
frame->pts * (double) vc->stream->codec->time_base.num /
(double) vc->stream->codec->time_base.den);
packet->size = sizeof(AVPicture);
return packet->size;
} else {
int got_packet = 0;
int status = avcodec_encode_video2(vc->stream->codec, packet,
frame, &got_packet);
int size = (status < 0) ? status : got_packet ? packet->size : 0;
if (frame)
MP_DBG(vo, "got pts %f; out size: %d\n",
frame->pts * (double) vc->stream->codec->time_base.num /
(double) vc->stream->codec->time_base.den, size);
if (got_packet)
encode_lavc_write_stats(vo->encode_lavc_ctx, vc->stream);
return size;
}
}
static void draw_image_unlocked(struct vo *vo, mp_image_t *mpi)
{
struct priv *vc = vo->priv;
struct encode_lavc_context *ectx = vo->encode_lavc_ctx;
int size;
AVCodecContext *avc;
int64_t frameipts;
double nextpts;
double pts = mpi ? mpi->pts : MP_NOPTS_VALUE;
if (!vc)
goto done;
if (!encode_lavc_start(ectx)) {
MP_WARN(vo, "NOTE: skipped initial video frame (probably because audio is not there yet)\n");
goto done;
}
if (pts == MP_NOPTS_VALUE) {
if (mpi)
MP_WARN(vo, "frame without pts, please report; synthesizing pts instead\n");
pts = vc->expected_next_pts;
}
avc = vc->stream->codec;
if (vc->worst_time_base.den == 0) {
//if (avc->time_base.num / avc->time_base.den >= vc->stream->time_base.num / vc->stream->time_base.den)
if (avc->time_base.num * (double) vc->stream->time_base.den >=
vc->stream->time_base.num * (double) avc->time_base.den) {
MP_VERBOSE(vo, "NOTE: using codec time base "
"(%d/%d) for frame dropping; the stream base (%d/%d) is "
"not worse.\n", (int)avc->time_base.num,
(int)avc->time_base.den, (int)vc->stream->time_base.num,
(int)vc->stream->time_base.den);
vc->worst_time_base = avc->time_base;
vc->worst_time_base_is_stream = 0;
} else {
MP_WARN(vo, "NOTE: not using codec time base (%d/%d) for frame "
"dropping; the stream base (%d/%d) is worse.\n",
(int)avc->time_base.num, (int)avc->time_base.den,
(int)vc->stream->time_base.num, (int)vc->stream->time_base.den);
vc->worst_time_base = vc->stream->time_base;
vc->worst_time_base_is_stream = 1;
}
if (ectx->options->maxfps)
vc->mindeltapts = ceil(vc->worst_time_base.den /
(vc->worst_time_base.num * ectx->options->maxfps));
else
vc->mindeltapts = 0;
// NOTE: we use the following "axiom" of av_rescale_q:
// if time base A is worse than time base B, then
// av_rescale_q(av_rescale_q(x, A, B), B, A) == x
// this can be proven as long as av_rescale_q rounds to nearest, which
// it currently does
// av_rescale_q(x, A, B) * B = "round x*A to nearest multiple of B"
// and:
// av_rescale_q(av_rescale_q(x, A, B), B, A) * A
// == "round av_rescale_q(x, A, B)*B to nearest multiple of A"
// == "round 'round x*A to nearest multiple of B' to nearest multiple of A"
//
// assume this fails. Then there is a value of x*A, for which the
// nearest multiple of B is outside the range [(x-0.5)*A, (x+0.5)*A[.
// Absurd, as this range MUST contain at least one multiple of B.
}
double timeunit = (double)vc->worst_time_base.num / vc->worst_time_base.den;
double outpts;
if (ectx->options->rawts)
outpts = pts;
else if (ectx->options->copyts) {
// fix the discontinuity pts offset
nextpts = pts;
if (ectx->discontinuity_pts_offset == MP_NOPTS_VALUE) {
ectx->discontinuity_pts_offset = ectx->next_in_pts - nextpts;
}
else if (fabs(nextpts + ectx->discontinuity_pts_offset - ectx->next_in_pts) > 30) {
MP_WARN(vo, "detected an unexpected discontinuity (pts jumped by "
"%f seconds)\n",
nextpts + ectx->discontinuity_pts_offset - ectx->next_in_pts);
ectx->discontinuity_pts_offset = ectx->next_in_pts - nextpts;
}
outpts = pts + ectx->discontinuity_pts_offset;
}
else {
// adjust pts by knowledge of audio pts vs audio playback time
double duration = 0;
if (ectx->last_video_in_pts != MP_NOPTS_VALUE)
duration = pts - ectx->last_video_in_pts;
if (duration < 0)
duration = timeunit; // XXX warn about discontinuity?
outpts = vc->lastpts + duration;
if (ectx->audio_pts_offset != MP_NOPTS_VALUE) {
double adj = outpts - pts - ectx->audio_pts_offset;
adj = FFMIN(adj, duration * 0.1);
adj = FFMAX(adj, -duration * 0.1);
outpts -= adj;
}
}
vc->lastpts = outpts;
ectx->last_video_in_pts = pts;
frameipts = floor((outpts + encode_lavc_getoffset(ectx, vc->stream))
/ timeunit + 0.5);
// calculate expected pts of next video frame
vc->expected_next_pts = pts + timeunit;
if (!ectx->options->rawts && ectx->options->copyts) {
// set next allowed output pts value
nextpts = vc->expected_next_pts + ectx->discontinuity_pts_offset;
if (nextpts > ectx->next_in_pts)
ectx->next_in_pts = nextpts;
}
// never-drop mode
if (ectx->options->neverdrop) {
int64_t step = vc->mindeltapts ? vc->mindeltapts : 1;
if (frameipts < vc->lastipts + step) {
MP_INFO(vo, "--oneverdrop increased pts by %d\n",
(int) (vc->lastipts - frameipts + step));
frameipts = vc->lastipts + step;
vc->lastpts = frameipts * timeunit - encode_lavc_getoffset(ectx, vc->stream);
}
}
if (vc->lastipts != AV_NOPTS_VALUE) {
// we have a valid image in lastimg
while (vc->lastipts < frameipts) {
int64_t thisduration = vc->harddup ? 1 : (frameipts - vc->lastipts);
AVPacket packet;
// we will ONLY encode this frame if it can be encoded at at least
// vc->mindeltapts after the last encoded frame!
int64_t skipframes =
(vc->lastencodedipts == AV_NOPTS_VALUE)
? 0
: vc->lastencodedipts + vc->mindeltapts - vc->lastipts;
if (skipframes < 0)
skipframes = 0;
if (thisduration > skipframes) {
AVFrame *frame = av_frame_alloc();
// this is a nop, unless the worst time base is the STREAM time base
frame->pts = av_rescale_q(vc->lastipts + skipframes,
vc->worst_time_base, avc->time_base);
enum AVPictureType savetype = frame->pict_type;
mp_image_copy_fields_to_av_frame(frame, vc->lastimg);
frame->pict_type = savetype;
// keep this at avcodec_get_frame_defaults default
frame->quality = avc->global_quality;
av_init_packet(&packet);
packet.data = vc->buffer;
packet.size = vc->buffer_size;
size = encode_video(vo, frame, &packet);
write_packet(vo, size, &packet);
++vc->lastdisplaycount;
vc->lastencodedipts = vc->lastipts + skipframes;
av_frame_free(&frame);
}
vc->lastipts += thisduration;
}
}
if (!mpi) {
// finish encoding
do {
AVPacket packet;
av_init_packet(&packet);
packet.data = vc->buffer;
packet.size = vc->buffer_size;
size = encode_video(vo, NULL, &packet);
write_packet(vo, size, &packet);
} while (size > 0);
} else {
if (frameipts >= vc->lastframeipts) {
if (vc->lastframeipts != AV_NOPTS_VALUE && vc->lastdisplaycount != 1)
MP_INFO(vo, "Frame at pts %d got displayed %d times\n",
(int) vc->lastframeipts, vc->lastdisplaycount);
talloc_free(vc->lastimg);
vc->lastimg = mpi;
mpi = NULL;
vc->lastimg_wants_osd = true;
vc->lastframeipts = vc->lastipts = frameipts;
if (ectx->options->rawts && vc->lastipts < 0) {
MP_ERR(vo, "why does this happen? DEBUG THIS! vc->lastipts = %lld\n", (long long) vc->lastipts);
vc->lastipts = -1;
}
vc->lastdisplaycount = 0;
} else {
MP_INFO(vo, "Frame at pts %d got dropped "
"entirely because pts went backwards\n", (int) frameipts);
vc->lastimg_wants_osd = false;
}
}
if (vc->lastimg && vc->lastimg_wants_osd && vo->params) {
struct mp_osd_res dim = osd_res_from_image_params(vo->params);
osd_draw_on_image(vo->osd, dim, vc->lastimg->pts, OSD_DRAW_SUB_ONLY,
vc->lastimg);
}
done:
talloc_free(mpi);
}
static void draw_image(struct vo *vo, mp_image_t *mpi)
{
pthread_mutex_lock(&vo->encode_lavc_ctx->lock);
draw_image_unlocked(vo, mpi);
pthread_mutex_unlock(&vo->encode_lavc_ctx->lock);
}
static void flip_page(struct vo *vo)
{
}
static int control(struct vo *vo, uint32_t request, void *data)
{
struct priv *vc = vo->priv;
int r = VO_NOTIMPL;
pthread_mutex_lock(&vo->encode_lavc_ctx->lock);
switch (request) {
case VOCTRL_GET_COLORSPACE:
*(struct mp_image_params *)data = vc->real_colorspace;
r = 1;
break;
}
pthread_mutex_unlock(&vo->encode_lavc_ctx->lock);
return r;
}
const struct vo_driver video_out_lavc = {
.encode = true,
.description = "video encoding using libavcodec",
.name = "lavc",
.untimed = true,
.preinit = preinit,
.query_format = query_format,
.reconfig = reconfig,
.control = control,
.uninit = uninit,
.draw_image = draw_image,
.flip_page = flip_page,
};
// vim: sw=4 ts=4 et tw=80
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