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mpv/video/decode/vd_lavc.c

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/*
* This file is part of MPlayer.
*
* 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 <assert.h>
#include <time.h>
#include <stdbool.h>
#include <sys/types.h>
#include <libavutil/common.h>
#include <libavutil/opt.h>
#include <libavutil/intreadwrite.h>
#include <libavutil/pixdesc.h>
#include "compat/libav.h"
#include "talloc.h"
#include "config.h"
#include "common/msg.h"
#include "options/options.h"
#include "bstr/bstr.h"
#include "common/av_opts.h"
#include "common/av_common.h"
#include "common/codecs.h"
#include "compat/mpbswap.h"
#include "video/fmt-conversion.h"
#include "vd.h"
#include "video/img_format.h"
#include "video/mp_image_pool.h"
#include "video/filter/vf.h"
#include "video/decode/dec_video.h"
#include "demux/stheader.h"
#include "demux/packet.h"
#include "video/csputils.h"
#include "lavc.h"
#if AVPALETTE_SIZE != MP_PALETTE_SIZE
#error palette too large, adapt video/mp_image.h:MP_PALETTE_SIZE
#endif
#include "options/m_option.h"
static void init_avctx(struct dec_video *vd, const char *decoder,
struct vd_lavc_hwdec *hwdec);
static void uninit_avctx(struct dec_video *vd);
static void setup_refcounting_hw(struct AVCodecContext *s);
static enum AVPixelFormat get_format_hwdec(struct AVCodecContext *avctx,
const enum AVPixelFormat *pix_fmt);
static void uninit(struct dec_video *vd);
#define OPT_BASE_STRUCT struct MPOpts
const m_option_t lavc_decode_opts_conf[] = {
OPT_FLAG_CONSTANTS("fast", lavc_param.fast, 0, 0, CODEC_FLAG2_FAST),
OPT_FLAG("show-all", lavc_param.show_all, 0),
OPT_STRING("skiploopfilter", lavc_param.skip_loop_filter_str, 0),
OPT_STRING("skipidct", lavc_param.skip_idct_str, 0),
OPT_STRING("skipframe", lavc_param.skip_frame_str, 0),
OPT_INTRANGE("threads", lavc_param.threads, 0, 0, 16),
OPT_FLAG_CONSTANTS("bitexact", lavc_param.bitexact, 0, 0, CODEC_FLAG_BITEXACT),
OPT_FLAG("check-hw-profile", lavc_param.check_hw_profile, 0),
OPT_STRING("o", lavc_param.avopt, 0),
{NULL, NULL, 0, 0, 0, 0, NULL}
};
const struct vd_lavc_hwdec mp_vd_lavc_vdpau;
const struct vd_lavc_hwdec mp_vd_lavc_vdpau_old;
const struct vd_lavc_hwdec mp_vd_lavc_vda;
const struct vd_lavc_hwdec mp_vd_lavc_vaapi;
const struct vd_lavc_hwdec mp_vd_lavc_vaapi_copy;
static const struct vd_lavc_hwdec *hwdec_list[] = {
#if HAVE_VDPAU_HWACCEL
&mp_vd_lavc_vdpau,
#endif
#if HAVE_VDPAU_DECODER
&mp_vd_lavc_vdpau_old,
#endif
#if HAVE_VDA_HWACCEL
&mp_vd_lavc_vda,
#endif
#if HAVE_VAAPI_HWACCEL
&mp_vd_lavc_vaapi,
&mp_vd_lavc_vaapi_copy,
#endif
NULL
};
static struct vd_lavc_hwdec *find_hwcodec(enum hwdec_type api)
{
for (int n = 0; hwdec_list[n]; n++) {
if (hwdec_list[n]->type == api)
return (struct vd_lavc_hwdec *)hwdec_list[n];
}
return NULL;
}
static bool hwdec_codec_allowed(struct dec_video *vd, const char *codec)
{
bstr s = bstr0(vd->opts->hwdec_codecs);
while (s.len) {
bstr item;
bstr_split_tok(s, ",", &item, &s);
if (bstr_equals0(item, "all") || bstr_equals0(item, codec))
return true;
}
return false;
}
static enum AVDiscard str2AVDiscard(struct dec_video *vd, char *str)
{
if (!str) return AVDISCARD_DEFAULT;
if (strcasecmp(str, "none" ) == 0) return AVDISCARD_NONE;
if (strcasecmp(str, "default") == 0) return AVDISCARD_DEFAULT;
if (strcasecmp(str, "nonref" ) == 0) return AVDISCARD_NONREF;
if (strcasecmp(str, "bidir" ) == 0) return AVDISCARD_BIDIR;
if (strcasecmp(str, "nonkey" ) == 0) return AVDISCARD_NONKEY;
if (strcasecmp(str, "all" ) == 0) return AVDISCARD_ALL;
MP_ERR(vd, "Unknown discard value %s\n", str);
return AVDISCARD_DEFAULT;
}
// Find the correct profile entry for the current codec and profile.
// Assumes the table has higher profiles first (for each codec).
const struct hwdec_profile_entry *hwdec_find_profile(
struct lavc_ctx *ctx, const struct hwdec_profile_entry *table)
{
assert(AV_CODEC_ID_NONE == 0);
struct lavc_param *lavc_param = &ctx->opts->lavc_param;
enum AVCodecID codec = ctx->avctx->codec_id;
int profile = ctx->avctx->profile;
// Assume nobody cares about these aspects of the profile
if (codec == AV_CODEC_ID_H264) {
if (profile == FF_PROFILE_H264_CONSTRAINED_BASELINE)
profile = FF_PROFILE_H264_MAIN;
}
for (int n = 0; table[n].av_codec; n++) {
if (table[n].av_codec == codec) {
if (table[n].ff_profile == FF_PROFILE_UNKNOWN ||
profile == FF_PROFILE_UNKNOWN ||
table[n].ff_profile == profile ||
!lavc_param->check_hw_profile)
return &table[n];
}
}
return NULL;
}
// Check codec support, without checking the profile.
bool hwdec_check_codec_support(const char *decoder,
const struct hwdec_profile_entry *table)
{
enum AVCodecID codec = mp_codec_to_av_codec_id(decoder);
for (int n = 0; table[n].av_codec; n++) {
if (table[n].av_codec == codec)
return true;
}
return false;
}
int hwdec_get_max_refs(struct lavc_ctx *ctx)
{
return ctx->avctx->codec_id == AV_CODEC_ID_H264 ? 16 : 2;
}
void hwdec_request_api(struct mp_hwdec_info *info, const char *api_name)
{
if (info && info->load_api)
info->load_api(info, api_name);
}
static int hwdec_probe(struct vd_lavc_hwdec *hwdec, struct mp_hwdec_info *info,
const char *decoder, const char **hw_decoder)
{
if (hwdec->codec_pairs) {
for (int n = 0; hwdec->codec_pairs[n + 0]; n += 2) {
const char *sw = hwdec->codec_pairs[n + 0];
const char *hw = hwdec->codec_pairs[n + 1];
if (decoder && strcmp(decoder, sw) == 0) {
AVCodec *codec = avcodec_find_decoder_by_name(hw);
*hw_decoder = hw;
if (codec)
goto found;
}
}
return HWDEC_ERR_NO_CODEC;
found: ;
}
int r = 0;
if (hwdec->probe)
r = hwdec->probe(hwdec, info, decoder);
return r;
}
static bool probe_hwdec(struct dec_video *vd, bool autoprobe, enum hwdec_type api,
const char *decoder, struct vd_lavc_hwdec **use_hwdec,
const char **use_decoder)
{
struct vd_lavc_hwdec *hwdec = find_hwcodec(api);
if (!hwdec) {
MP_VERBOSE(vd, "Requested hardware decoder not "
"compiled.\n");
return false;
}
const char *hw_decoder = NULL;
int r = hwdec_probe(hwdec, &vd->hwdec_info, decoder, &hw_decoder);
if (r >= 0) {
*use_hwdec = hwdec;
*use_decoder = hw_decoder;
return true;
} else if (r == HWDEC_ERR_NO_CODEC) {
MP_VERBOSE(vd, "Hardware decoder '%s' not found in "
"libavcodec.\n", hw_decoder ? hw_decoder : decoder);
} else if (r == HWDEC_ERR_NO_CTX && !autoprobe) {
MP_WARN(vd, "VO does not support requested "
"hardware decoder.\n");
}
return false;
}
static int init(struct dec_video *vd, const char *decoder)
{
vd_ffmpeg_ctx *ctx;
ctx = vd->priv = talloc_zero(NULL, vd_ffmpeg_ctx);
ctx->log = vd->log;
ctx->opts = vd->opts;
ctx->non_dr1_pool = talloc_steal(ctx, mp_image_pool_new(16));
if (bstr_endswith0(bstr0(decoder), "_vdpau")) {
MP_WARN(vd, "VDPAU decoder '%s' was requested. "
"This way of enabling hardware\ndecoding is not supported "
"anymore. Use --hwdec=vdpau instead.\nThe --hwdec-codec=... "
"option can be used to restrict which codecs are\nenabled, "
"otherwise all hardware decoding is tried for all codecs.\n",
decoder);
uninit(vd);
return 0;
}
struct vd_lavc_hwdec *hwdec = NULL;
const char *hw_decoder = NULL;
if (hwdec_codec_allowed(vd, decoder)) {
if (vd->opts->hwdec_api == HWDEC_AUTO) {
for (int n = 0; hwdec_list[n]; n++) {
if (probe_hwdec(vd, true, hwdec_list[n]->type, decoder,
&hwdec, &hw_decoder))
break;
}
} else if (vd->opts->hwdec_api != HWDEC_NONE) {
probe_hwdec(vd, false, vd->opts->hwdec_api, decoder,
&hwdec, &hw_decoder);
}
} else {
MP_VERBOSE(vd, "Not trying to use hardware decoding: "
"codec %s is blacklisted by user.\n", decoder);
}
if (hwdec) {
ctx->software_fallback_decoder = talloc_strdup(ctx, decoder);
if (hw_decoder)
decoder = hw_decoder;
MP_INFO(vd, "Trying to use hardware decoding.\n");
} else if (vd->opts->hwdec_api != HWDEC_NONE) {
MP_INFO(vd, "Using software decoding.\n");
}
init_avctx(vd, decoder, hwdec);
if (!ctx->avctx) {
if (ctx->software_fallback_decoder) {
MP_ERR(vd, "Error initializing hardware decoding, "
"falling back to software decoding.\n");
decoder = ctx->software_fallback_decoder;
ctx->software_fallback_decoder = NULL;
init_avctx(vd, decoder, NULL);
}
if (!ctx->avctx) {
uninit(vd);
return 0;
}
}
return 1;
}
static void set_from_bih(AVCodecContext *avctx, uint32_t format,
MP_BITMAPINFOHEADER *bih)
{
if (bih->biSize > sizeof(*bih))
mp_lavc_set_extradata(avctx, bih + 1, bih->biSize - sizeof(*bih));
avctx->bits_per_coded_sample = bih->biBitCount;
avctx->coded_width = bih->biWidth;
avctx->coded_height = bih->biHeight;
}
static void init_avctx(struct dec_video *vd, const char *decoder,
struct vd_lavc_hwdec *hwdec)
{
vd_ffmpeg_ctx *ctx = vd->priv;
struct lavc_param *lavc_param = &vd->opts->lavc_param;
bool mp_rawvideo = false;
struct sh_stream *sh = vd->header;
assert(!ctx->avctx);
if (strcmp(decoder, "mp-rawvideo") == 0) {
mp_rawvideo = true;
decoder = "rawvideo";
}
AVCodec *lavc_codec = avcodec_find_decoder_by_name(decoder);
if (!lavc_codec)
return;
ctx->hwdec_info = &vd->hwdec_info;
ctx->do_dr1 = ctx->do_hw_dr1 = 0;
ctx->pix_fmt = AV_PIX_FMT_NONE;
ctx->hwdec = hwdec;
ctx->avctx = avcodec_alloc_context3(lavc_codec);
AVCodecContext *avctx = ctx->avctx;
avctx->opaque = vd;
avctx->codec_type = AVMEDIA_TYPE_VIDEO;
avctx->codec_id = lavc_codec->id;
#if HAVE_AVUTIL_REFCOUNTING
avctx->refcounted_frames = 1;
ctx->pic = av_frame_alloc();
#else
ctx->pic = avcodec_alloc_frame();
#endif
if (ctx->hwdec) {
ctx->do_hw_dr1 = true;
avctx->thread_count = 1;
avctx->get_format = get_format_hwdec;
setup_refcounting_hw(avctx);
if (ctx->hwdec->init(ctx) < 0) {
uninit_avctx(vd);
return;
}
} else {
#if !HAVE_AVUTIL_REFCOUNTING
if (lavc_codec->capabilities & CODEC_CAP_DR1) {
ctx->do_dr1 = true;
avctx->get_buffer = mp_codec_get_buffer;
avctx->release_buffer = mp_codec_release_buffer;
}
#endif
mp_set_avcodec_threads(avctx, lavc_param->threads);
}
avctx->flags |= lavc_param->bitexact;
avctx->flags2 |= lavc_param->fast;
if (lavc_param->show_all) {
#ifdef CODEC_FLAG2_SHOW_ALL
avctx->flags2 |= CODEC_FLAG2_SHOW_ALL; // ffmpeg only?
#endif
#ifdef CODEC_FLAG_OUTPUT_CORRUPT
avctx->flags |= CODEC_FLAG_OUTPUT_CORRUPT; // added with Libav 10
#endif
}
avctx->skip_loop_filter = str2AVDiscard(vd, lavc_param->skip_loop_filter_str);
avctx->skip_idct = str2AVDiscard(vd, lavc_param->skip_idct_str);
avctx->skip_frame = str2AVDiscard(vd, lavc_param->skip_frame_str);
if (lavc_param->avopt) {
if (parse_avopts(avctx, lavc_param->avopt) < 0) {
MP_ERR(vd, "Your options /%s/ look like gibberish to me pal\n",
lavc_param->avopt);
uninit_avctx(vd);
return;
}
}
// Do this after the above avopt handling in case it changes values
ctx->skip_frame = avctx->skip_frame;
avctx->codec_tag = sh->format;
avctx->coded_width = sh->video->disp_w;
avctx->coded_height = sh->video->disp_h;
// demux_mkv
if (sh->video->bih)
set_from_bih(avctx, sh->format, sh->video->bih);
if (mp_rawvideo) {
avctx->pix_fmt = imgfmt2pixfmt(sh->format);
avctx->codec_tag = 0;
if (avctx->pix_fmt == AV_PIX_FMT_NONE && sh->format)
MP_ERR(vd, "Image format %s not supported by lavc.\n",
mp_imgfmt_to_name(sh->format));
}
if (sh->lav_headers)
mp_copy_lav_codec_headers(avctx, sh->lav_headers);
/* open it */
if (avcodec_open2(avctx, lavc_codec, NULL) < 0) {
MP_ERR(vd, "Could not open codec.\n");
uninit_avctx(vd);
return;
}
}
static void uninit_avctx(struct dec_video *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
AVCodecContext *avctx = ctx->avctx;
if (avctx) {
if (avctx->codec && avcodec_close(avctx) < 0)
MP_ERR(vd, "Could not close codec.\n");
av_freep(&avctx->extradata);
av_freep(&avctx->slice_offset);
}
av_freep(&ctx->avctx);
if (ctx->hwdec && ctx->hwdec->uninit)
ctx->hwdec->uninit(ctx);
#if HAVE_AVUTIL_REFCOUNTING
av_frame_free(&ctx->pic);
#else
avcodec_free_frame(&ctx->pic);
mp_buffer_pool_free(&ctx->dr1_buffer_pool);
#endif
}
static void uninit(struct dec_video *vd)
{
uninit_avctx(vd);
}
static void update_image_params(struct dec_video *vd, AVFrame *frame,
struct mp_image_params *out_params)
{
vd_ffmpeg_ctx *ctx = vd->priv;
int width = frame->width;
int height = frame->height;
float aspect = av_q2d(frame->sample_aspect_ratio) * width / height;
int pix_fmt = frame->format;
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(54, 40, 0)
pix_fmt = ctx->avctx->pix_fmt;
#endif
if (pix_fmt != ctx->pix_fmt) {
ctx->pix_fmt = pix_fmt;
ctx->best_csp = pixfmt2imgfmt(pix_fmt);
if (!ctx->best_csp)
MP_ERR(vd, "lavc pixel format %s not supported.\n",
av_get_pix_fmt_name(pix_fmt));
}
int d_w, d_h;
vf_set_dar(&d_w, &d_h, width, height, aspect);
*out_params = (struct mp_image_params) {
.imgfmt = ctx->best_csp,
.w = width,
.h = height,
.d_w = d_w,
.d_h = d_h,
.colorspace = avcol_spc_to_mp_csp(ctx->avctx->colorspace),
.colorlevels = avcol_range_to_mp_csp_levels(ctx->avctx->color_range),
.chroma_location =
avchroma_location_to_mp(ctx->avctx->chroma_sample_location),
};
}
static enum AVPixelFormat get_format_hwdec(struct AVCodecContext *avctx,
const enum AVPixelFormat *fmt)
{
struct dec_video *vd = avctx->opaque;
vd_ffmpeg_ctx *ctx = vd->priv;
MP_VERBOSE(vd, "Pixel formats supported by decoder:");
for (int i = 0; fmt[i] != AV_PIX_FMT_NONE; i++)
MP_VERBOSE(vd, " %s", av_get_pix_fmt_name(fmt[i]));
MP_VERBOSE(vd, "\n");
assert(ctx->hwdec);
for (int i = 0; fmt[i] != AV_PIX_FMT_NONE; i++) {
const int *okfmt = ctx->hwdec->image_formats;
for (int n = 0; okfmt && okfmt[n]; n++) {
if (imgfmt2pixfmt(okfmt[n]) == fmt[i])
return fmt[i];
}
}
return AV_PIX_FMT_NONE;
}
static struct mp_image *get_surface_hwdec(struct dec_video *vd, AVFrame *pic)
{
vd_ffmpeg_ctx *ctx = vd->priv;
/* Decoders using ffmpeg's hwaccel architecture (everything except vdpau)
* can fall back to software decoding automatically. However, we don't
* want that: multithreading was already disabled. ffmpeg's fallback
* isn't really useful, and causes more trouble than it helps.
*
* Instead of trying to "adjust" the thread_count fields in avctx, let
* decoding fail hard. Then decode_with_fallback() will do our own software
* fallback. Fully reinitializing the decoder is saner, and will probably
* save us from other weird corner cases, like having to "reroute" the
* get_buffer callback.
*/
int imgfmt = pixfmt2imgfmt(pic->format);
if (!IMGFMT_IS_HWACCEL(imgfmt))
return NULL;
// Using frame->width/height is bad. For non-mod 16 video (which would
// require alignment of frame sizes) we want the decoded size, not the
// aligned size. At least vdpau needs this: the video mixer is created
// with decoded size, and the video surfaces must have matching size.
int w = ctx->avctx->width;
int h = ctx->avctx->height;
struct mp_image *mpi = ctx->hwdec->allocate_image(ctx, imgfmt, w, h);
if (mpi) {
for (int i = 0; i < 4; i++)
pic->data[i] = mpi->planes[i];
}
return mpi;
}
#if HAVE_AVUTIL_REFCOUNTING
static void free_mpi(void *opaque, uint8_t *data)
{
struct mp_image *mpi = opaque;
talloc_free(mpi);
}
static int get_buffer2_hwdec(AVCodecContext *avctx, AVFrame *pic, int flags)
{
struct dec_video *vd = avctx->opaque;
struct mp_image *mpi = get_surface_hwdec(vd, pic);
if (!mpi)
return -1;
pic->buf[0] = av_buffer_create(NULL, 0, free_mpi, mpi, 0);
return 0;
}
static void setup_refcounting_hw(AVCodecContext *avctx)
{
avctx->get_buffer2 = get_buffer2_hwdec;
}
#else /* HAVE_AVUTIL_REFCOUNTING */
static int get_buffer_hwdec(AVCodecContext *avctx, AVFrame *pic)
{
struct dec_video *vd = avctx->opaque;
struct mp_image *mpi = get_surface_hwdec(vd, pic);
if (!mpi)
return -1;
pic->opaque = mpi;
pic->type = FF_BUFFER_TYPE_USER;
/* The libavcodec reordered_opaque functionality is implemented by
* a similar copy in avcodec_default_get_buffer() and without a
* workaround like this it'd stop working when a custom buffer
* callback is used.
*/
pic->reordered_opaque = avctx->reordered_opaque;
return 0;
}
static void release_buffer_hwdec(AVCodecContext *avctx, AVFrame *pic)
{
mp_image_t *mpi = pic->opaque;
assert(pic->type == FF_BUFFER_TYPE_USER);
assert(mpi);
talloc_free(mpi);
for (int i = 0; i < 4; i++)
pic->data[i] = NULL;
}
static void setup_refcounting_hw(AVCodecContext *avctx)
{
avctx->get_buffer = get_buffer_hwdec;
avctx->release_buffer = release_buffer_hwdec;
}
#endif /* HAVE_AVUTIL_REFCOUNTING */
#if HAVE_AVUTIL_REFCOUNTING
static struct mp_image *image_from_decoder(struct dec_video *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
AVFrame *pic = ctx->pic;
struct mp_image *img = mp_image_from_av_frame(pic);
av_frame_unref(pic);
return img;
}
#else /* HAVE_AVUTIL_REFCOUNTING */
static void fb_ref(void *b)
{
mp_buffer_ref(b);
}
static void fb_unref(void *b)
{
mp_buffer_unref(b);
}
static bool fb_is_unique(void *b)
{
return mp_buffer_is_unique(b);
}
static struct mp_image *image_from_decoder(struct dec_video *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
AVFrame *pic = ctx->pic;
struct mp_image new = {0};
mp_image_copy_fields_from_av_frame(&new, pic);
struct mp_image *mpi;
if (ctx->do_hw_dr1 && pic->opaque) {
mpi = pic->opaque; // reordered frame
assert(mpi);
mpi = mp_image_new_ref(mpi);
mp_image_copy_attributes(mpi, &new);
} else if (ctx->do_dr1 && pic->opaque) {
struct FrameBuffer *fb = pic->opaque;
mp_buffer_ref(fb); // initial reference for mpi
mpi = mp_image_new_external_ref(&new, fb, fb_ref, fb_unref,
fb_is_unique, NULL);
} else {
mpi = mp_image_pool_new_copy(ctx->non_dr1_pool, &new);
}
return mpi;
}
#endif /* HAVE_AVUTIL_REFCOUNTING */
static int decode(struct dec_video *vd, struct demux_packet *packet,
int flags, struct mp_image **out_image)
{
int got_picture = 0;
int ret;
vd_ffmpeg_ctx *ctx = vd->priv;
AVCodecContext *avctx = ctx->avctx;
AVPacket pkt;
if (flags & 2)
avctx->skip_frame = AVDISCARD_ALL;
else if (flags & 1)
avctx->skip_frame = AVDISCARD_NONREF;
else
avctx->skip_frame = ctx->skip_frame;
mp_set_av_packet(&pkt, packet, NULL);
ret = avcodec_decode_video2(avctx, ctx->pic, &got_picture, &pkt);
if (ret < 0) {
MP_WARN(vd, "Error while decoding frame!\n");
return -1;
}
// Skipped frame, or delayed output due to multithreaded decoding.
if (!got_picture)
return 0;
struct mp_image_params params;
update_image_params(vd, ctx->pic, &params);
vd->codec_pts = mp_pts_from_av(ctx->pic->pkt_pts, NULL);
vd->codec_dts = mp_pts_from_av(ctx->pic->pkt_dts, NULL);
// Note: potentially resets ctx->pic as it is transferred to mpi
struct mp_image *mpi = image_from_decoder(vd);
assert(mpi->planes[0]);
mp_image_set_params(mpi, &params);
if (ctx->hwdec && ctx->hwdec->process_image)
mpi = ctx->hwdec->process_image(ctx, mpi);
*out_image = mpi;
return 1;
}
static int force_fallback(struct dec_video *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
if (ctx->software_fallback_decoder) {
uninit_avctx(vd);
MP_ERR(vd, "Error using hardware "
"decoding, falling back to software decoding.\n");
const char *decoder = ctx->software_fallback_decoder;
ctx->software_fallback_decoder = NULL;
init_avctx(vd, decoder, NULL);
return ctx->avctx ? CONTROL_OK : CONTROL_ERROR;
}
return CONTROL_FALSE;
}
static struct mp_image *decode_with_fallback(struct dec_video *vd,
struct demux_packet *packet, int flags)
{
vd_ffmpeg_ctx *ctx = vd->priv;
if (!ctx->avctx)
return NULL;
struct mp_image *mpi = NULL;
int res = decode(vd, packet, flags, &mpi);
if (res < 0) {
// Failed hardware decoding? Try again in software.
if (force_fallback(vd) == CONTROL_OK)
decode(vd, packet, flags, &mpi);
}
return mpi;
}
static int control(struct dec_video *vd, int cmd, void *arg)
{
vd_ffmpeg_ctx *ctx = vd->priv;
AVCodecContext *avctx = ctx->avctx;
switch (cmd) {
case VDCTRL_RESET:
avcodec_flush_buffers(avctx);
return CONTROL_TRUE;
case VDCTRL_QUERY_UNSEEN_FRAMES:;
int delay = avctx->has_b_frames;
assert(delay >= 0);
if (avctx->active_thread_type & FF_THREAD_FRAME)
delay += avctx->thread_count - 1;
*(int *)arg = delay;
return CONTROL_TRUE;
case VDCTRL_FORCE_HWDEC_FALLBACK:
return force_fallback(vd);
}
return CONTROL_UNKNOWN;
}
static void add_decoders(struct mp_decoder_list *list)
{
mp_add_lavc_decoders(list, AVMEDIA_TYPE_VIDEO);
mp_add_decoder(list, "lavc", "mp-rawvideo", "mp-rawvideo",
"raw video");
}
const struct vd_functions mpcodecs_vd_ffmpeg = {
.name = "lavc",
.add_decoders = add_decoders,
.init = init,
.uninit = uninit,
.control = control,
.decode = decode_with_fallback,
};
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