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mpv/video/out/vo_lavc.c
wm4 23ab098969 video: remove slice based filtering and video output 
Slices allowed filtering or drawing video in horizontal bands or
blocks. This allowed working on the video in smaller units. In theory,
this could bring a performance win by lowering cache pressure, as you
didn't have to keep the whole video frame in cache while filtering,
only the slice.

In practice, the slice code path was barely used for the following
reasons:
- Multithreaded decoding with ffmpeg didn't use slices. The ffmpeg
  slice callback was disabled, because it can be called from another
  thread, and the mplayer video chain is not thread-safe.
- There was nothing that would turn "full" images into appropriate
  slices, so slices were rarely used.
- Most filters didn't actually support slices.

On the other hand, supporting slices lead to code duplication and more
complex code in general. I made some experiments and didn't find any
actual measurable performance improvements when using slices. Even
ffmpeg removed slices based filtering from libavfilter in favor of
simpler code.

The most broken thing about the slices code path is that slices can't
be queued, like it is done for images in vo.c.
2013-01-13 17:39:31 +01:00

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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 "compat/libav.h"
#include "core/mp_common.h"
#include "core/options.h"
#include "video/fmt-conversion.h"
#include "video/mp_image.h"
#include "video/vfcap.h"
#include "core/subopt-helper.h"
#include "talloc.h"
#include "vo.h"
#include "core/encode_lavc.h"
#include "sub/sub.h"
#include "sub/dec_sub.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;
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_csp_details colorspace;
};
static int preinit(struct vo *vo, const char *arg)
{
struct priv *vc;
if (!encode_lavc_available(vo->encode_lavc_ctx)) {
mp_msg(MSGT_ENCODE, MSGL_ERR,
"vo-lavc: 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;
vc->colorspace = (struct mp_csp_details) MP_CSP_DETAILS_DEFAULTS;
return 0;
}
static void draw_image(struct vo *vo, mp_image_t *mpi, double pts);
static void uninit(struct vo *vo)
{
struct priv *vc = vo->priv;
if (!vc)
return;
if (vc->lastipts >= 0 && vc->stream)
draw_image(vo, NULL, MP_NOPTS_VALUE);
if (vc->lastimg) {
// palette hack
if (vc->lastimg->imgfmt == IMGFMT_RGB8
|| vc->lastimg->imgfmt == IMGFMT_BGR8)
vc->lastimg->planes[1] = NULL;
free_mp_image(vc->lastimg);
vc->lastimg = NULL;
}
vo->priv = NULL;
}
static int config(struct vo *vo, uint32_t width, uint32_t height,
uint32_t d_width, uint32_t d_height, uint32_t flags,
uint32_t format)
{
struct priv *vc = vo->priv;
enum PixelFormat pix_fmt = imgfmt2pixfmt(format);
AVRational display_aspect_ratio, image_aspect_ratio;
AVRational aspect;
if (!vc)
return -1;
display_aspect_ratio.num = d_width;
display_aspect_ratio.den = d_height;
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_msg(MSGT_ENCODE, MSGL_WARN, "vo-lavc: 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);
}
return 0;
}
/* FIXME Is it possible with raw video? */
mp_msg(MSGT_ENCODE, MSGL_ERR,
"vo-lavc: resolution changes not supported.\n");
goto error;
}
vc->lastipts = MP_NOPTS_VALUE;
vc->lastframeipts = MP_NOPTS_VALUE;
if (pix_fmt == PIX_FMT_NONE)
goto error; /* imgfmt2pixfmt already prints something */
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, vc->colorspace.format);
encode_lavc_set_csp_levels(vo->encode_lavc_ctx, vc->stream, vc->colorspace.levels_out);
if (encode_lavc_open_codec(vo->encode_lavc_ctx, vc->stream) < 0)
goto error;
vc->colorspace.format = encode_lavc_get_csp(vo->encode_lavc_ctx, vc->stream);
vc->colorspace.levels_out = 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);
vc->lastimg = alloc_mpi(width, height, format);
// palette hack
if (vc->lastimg->imgfmt == IMGFMT_RGB8 ||
vc->lastimg->imgfmt == IMGFMT_BGR8)
vc->lastimg->planes[1] = talloc_zero_size(vc, 1024);
return 0;
error:
uninit(vo);
return -1;
}
static int query_format(struct vo *vo, uint32_t format)
{
enum PixelFormat pix_fmt = imgfmt2pixfmt(format);
if (!vo->encode_lavc_ctx)
return 0;
if (!encode_lavc_supports_pixfmt(vo->encode_lavc_ctx, pix_fmt))
return 0;
return
VFCAP_CSP_SUPPORTED |
// we can do it
VFCAP_CSP_SUPPORTED_BY_HW |
// we don't convert colorspaces here
VFCAP_OSD;
// we have OSD
}
static void write_packet(struct vo *vo, int size, AVPacket *packet)
{
struct priv *vc = vo->priv;
if (size < 0) {
mp_msg(MSGT_ENCODE, MSGL_ERR, "vo-lavc: 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_msg(MSGT_ENCODE, MSGL_WARN, "vo-lavc: 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_msg(MSGT_ENCODE, MSGL_ERR, "vo-lavc: 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_msg(MSGT_ENCODE, MSGL_DBG2, "vo-lavc: 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_msg(MSGT_ENCODE, MSGL_DBG2, "vo-lavc: got pts %f; out size: %d\n",
frame->pts * (double) vc->stream->codec->time_base.num /
(double) vc->stream->codec->time_base.den, size);
encode_lavc_write_stats(vo->encode_lavc_ctx, vc->stream);
return size;
}
}
static void draw_image(struct vo *vo, mp_image_t *mpi, double pts)
{
struct priv *vc = vo->priv;
struct encode_lavc_context *ectx = vo->encode_lavc_ctx;
int i, size;
AVFrame *frame;
AVCodecContext *avc;
int64_t frameipts;
double nextpts;
if (!vc)
return;
if (!encode_lavc_start(ectx)) {
mp_msg(MSGT_ENCODE, MSGL_WARN, "vo-lavc: NOTE: skipped initial video frame (probably because audio is not there yet)\n");
return;
}
if (pts == MP_NOPTS_VALUE) {
if (mpi)
mp_msg(MSGT_ENCODE, MSGL_WARN, "vo-lavc: 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_msg(MSGT_ENCODE, MSGL_V, "vo-lavc: 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_msg(MSGT_ENCODE, MSGL_WARN, "vo-lavc: 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;
}
// 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_msg(MSGT_ENCODE, MSGL_WARN,
"vo-lavc: 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 && frameipts <= vc->lastipts) {
mp_msg(MSGT_ENCODE, MSGL_INFO, "vo-lavc: -oneverdrop increased pts by %d\n",
(int) (vc->lastipts - frameipts + 1));
frameipts = vc->lastipts + 1;
vc->lastpts = frameipts * timeunit - encode_lavc_getoffset(ectx, vc->stream);
}
if (vc->lastipts != MP_NOPTS_VALUE) {
frame = avcodec_alloc_frame();
// we have a valid image in lastimg
while (vc->lastipts < frameipts) {
int64_t thisduration = vc->harddup ? 1 : (frameipts - vc->lastipts);
AVPacket packet;
avcodec_get_frame_defaults(frame);
// this is a nop, unless the worst time base is the STREAM time base
frame->pts = av_rescale_q(vc->lastipts, vc->worst_time_base,
avc->time_base);
for (i = 0; i < 4; i++) {
frame->data[i] = vc->lastimg->planes[i];
frame->linesize[i] = vc->lastimg->stride[i];
}
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->lastipts += thisduration;
++vc->lastdisplaycount;
}
avcodec_free_frame(&frame);
}
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 != MP_NOPTS_VALUE && vc->lastdisplaycount != 1)
mp_msg(MSGT_ENCODE, MSGL_INFO,
"vo-lavc: Frame at pts %d got displayed %d times\n",
(int) vc->lastframeipts, vc->lastdisplaycount);
copy_mpi(vc->lastimg, mpi);
vc->lastimg_wants_osd = true;
// palette hack
if (vc->lastimg->imgfmt == IMGFMT_RGB8 ||
vc->lastimg->imgfmt == IMGFMT_BGR8)
memcpy(vc->lastimg->planes[1], mpi->planes[1], 1024);
vc->lastframeipts = vc->lastipts = frameipts;
if (ectx->options->rawts && vc->lastipts < 0) {
mp_msg(MSGT_ENCODE, MSGL_ERR, "vo-lavc: why does this happen? DEBUG THIS! vc->lastipts = %lld\n", (long long) vc->lastipts);
vc->lastipts = -1;
}
vc->lastdisplaycount = 0;
} else {
mp_msg(MSGT_ENCODE, MSGL_INFO, "vo-lavc: Frame at pts %d got dropped "
"entirely because pts went backwards\n", (int) frameipts);
vc->lastimg_wants_osd = false;
}
}
}
static void flip_page_timed(struct vo *vo, unsigned int pts_us, int duration)
{
}
static void check_events(struct vo *vo)
{
}
static void draw_osd(struct vo *vo, struct osd_state *osd)
{
struct priv *vc = vo->priv;
if (vc->lastimg && vc->lastimg_wants_osd) {
struct aspect_data asp = vo->aspdat;
double sar = (double)asp.orgw / asp.orgh;
double dar = (double)asp.prew / asp.preh;
struct mp_osd_res dim = {
.w = asp.orgw,
.h = asp.orgh,
.display_par = sar / dar,
.video_par = dar / sar,
};
mp_image_set_colorspace_details(vc->lastimg, &vc->colorspace);
osd_draw_on_image(osd, dim, osd->vo_pts, OSD_DRAW_SUB_ONLY, vc->lastimg);
}
}
static int control(struct vo *vo, uint32_t request, void *data)
{
struct priv *vc = vo->priv;
switch (request) {
case VOCTRL_SET_YUV_COLORSPACE:
vc->colorspace = *(struct mp_csp_details *)data;
if (vc->stream) {
encode_lavc_set_csp(vo->encode_lavc_ctx, vc->stream, vc->colorspace.format);
encode_lavc_set_csp_levels(vo->encode_lavc_ctx, vc->stream, vc->colorspace.levels_out);
vc->colorspace.format = encode_lavc_get_csp(vo->encode_lavc_ctx, vc->stream);
vc->colorspace.levels_out = encode_lavc_get_csp_levels(vo->encode_lavc_ctx, vc->stream);
}
return 1;
case VOCTRL_GET_YUV_COLORSPACE:
*(struct mp_csp_details *)data = vc->colorspace;
return 1;
}
return VO_NOTIMPL;
}
const struct vo_driver video_out_lavc = {
.buffer_frames = false,
.info = &(const struct vo_info_s){
"video encoding using libavcodec",
"lavc",
"Nicolas George <george@nsup.org>, Rudolf Polzer <divVerent@xonotic.org>",
""
},
.preinit = preinit,
.query_format = query_format,
.config = config,
.control = control,
.uninit = uninit,
.check_events = check_events,
.draw_image_pts = draw_image,
.draw_osd = draw_osd,
.flip_page_timed = flip_page_timed,
};
// vim: sw=4 ts=4 et tw=80
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