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mpv/video/decode/vd_lavc.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 Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <assert.h>
#include <stdbool.h>
#include <libavcodec/avcodec.h>
#include <libavutil/common.h>
#include <libavutil/hwcontext.h>
#include <libavutil/opt.h>
#include <libavutil/intreadwrite.h>
#include <libavutil/pixdesc.h>
#include "config.h"
#include "mpv_talloc.h"
#include "common/global.h"
#include "common/msg.h"
#include "options/m_config.h"
#include "options/options.h"
#include "misc/bstr.h"
#include "common/av_common.h"
#include "common/codecs.h"
#include "video/fmt-conversion.h"
#include "filters/f_decoder_wrapper.h"
#include "filters/filter_internal.h"
#include "video/hwdec.h"
#include "video/img_format.h"
#include "video/mp_image.h"
#include "video/mp_image_pool.h"
#include "demux/demux.h"
#include "demux/stheader.h"
#include "demux/packet.h"
#include "video/csputils.h"
#include "video/sws_utils.h"
#include "video/out/vo.h"
#include "options/m_option.h"
static void init_avctx(struct mp_filter *vd);
static void uninit_avctx(struct mp_filter *vd);
static int get_buffer2_direct(AVCodecContext *avctx, AVFrame *pic, int flags);
static enum AVPixelFormat get_format_hwdec(struct AVCodecContext *avctx,
const enum AVPixelFormat *pix_fmt);
static int hwdec_validate_opt(struct mp_log *log, const m_option_t *opt,
struct bstr name, struct bstr param);
#define HWDEC_DELAY_QUEUE_COUNT 2
#define OPT_BASE_STRUCT struct vd_lavc_params
struct vd_lavc_params {
int fast;
int show_all;
int skip_loop_filter;
int skip_idct;
int skip_frame;
int framedrop;
int threads;
int bitexact;
int old_x264;
int check_hw_profile;
int software_fallback;
char **avopts;
int dr;
char *hwdec_api;
char *hwdec_codecs;
int hwdec_image_format;
int hwdec_extra_frames;
};
static const struct m_opt_choice_alternatives discard_names[] = {
{"none", AVDISCARD_NONE},
{"default", AVDISCARD_DEFAULT},
{"nonref", AVDISCARD_NONREF},
{"bidir", AVDISCARD_BIDIR},
{"nonkey", AVDISCARD_NONKEY},
{"all", AVDISCARD_ALL},
{0}
};
#define OPT_DISCARD(name, field, flags) \
OPT_GENERAL(int, name, field, flags, .type = CONF_TYPE_CHOICE, \
.priv = (void *)discard_names)
const struct m_sub_options vd_lavc_conf = {
.opts = (const m_option_t[]){
OPT_FLAG("vd-lavc-fast", fast, 0),
OPT_FLAG("vd-lavc-show-all", show_all, 0),
OPT_DISCARD("vd-lavc-skiploopfilter", skip_loop_filter, 0),
OPT_DISCARD("vd-lavc-skipidct", skip_idct, 0),
OPT_DISCARD("vd-lavc-skipframe", skip_frame, 0),
OPT_DISCARD("vd-lavc-framedrop", framedrop, 0),
OPT_INT("vd-lavc-threads", threads, M_OPT_MIN, .min = 0),
OPT_FLAG("vd-lavc-bitexact", bitexact, 0),
OPT_FLAG("vd-lavc-assume-old-x264", old_x264, 0),
OPT_FLAG("vd-lavc-check-hw-profile", check_hw_profile, 0),
OPT_CHOICE_OR_INT("vd-lavc-software-fallback", software_fallback,
0, 1, INT_MAX, ({"no", INT_MAX}, {"yes", 1})),
OPT_KEYVALUELIST("vd-lavc-o", avopts, 0),
OPT_FLAG("vd-lavc-dr", dr, 0),
OPT_STRING_VALIDATE("hwdec", hwdec_api,
M_OPT_OPTIONAL_PARAM | UPDATE_HWDEC,
hwdec_validate_opt),
OPT_STRING("hwdec-codecs", hwdec_codecs, 0),
OPT_IMAGEFORMAT("hwdec-image-format", hwdec_image_format, 0, .min = -1),
OPT_INTRANGE("hwdec-extra-frames", hwdec_extra_frames, 0, 0, 256),
{0}
},
.size = sizeof(struct vd_lavc_params),
.defaults = &(const struct vd_lavc_params){
.show_all = 0,
.check_hw_profile = 1,
.software_fallback = 3,
.skip_loop_filter = AVDISCARD_DEFAULT,
.skip_idct = AVDISCARD_DEFAULT,
.skip_frame = AVDISCARD_DEFAULT,
.framedrop = AVDISCARD_NONREF,
.dr = 1,
.hwdec_api = "no",
.hwdec_codecs = "h264,vc1,hevc,vp9",
// Maximum number of surfaces the player wants to buffer. This number
// might require adjustment depending on whatever the player does;
// for example, if vo_gpu increases the number of reference surfaces for
// interpolation, this value has to be increased too.
.hwdec_extra_frames = 6,
},
};
struct hwdec_info {
char name[64];
char method_name[24]; // non-unique name describing the hwdec method
const AVCodec *codec; // implemented by this codec
enum AVHWDeviceType lavc_device; // if not NONE, get a hwdevice
bool copying; // if true, outputs sw frames, or copy to sw ourselves
enum AVPixelFormat pix_fmt; // if not NONE, select in get_format
bool use_hw_frames; // set AVCodecContext.hw_frames_ctx
bool use_hw_device; // set AVCodecContext.hw_device_ctx
unsigned int flags; // HWDEC_FLAG_*
// for internal sorting
int auto_pos;
int rank;
};
typedef struct lavc_ctx {
struct mp_log *log;
struct m_config_cache *opts_cache;
struct vd_lavc_params *opts;
struct mp_codec_params *codec;
AVCodecContext *avctx;
AVFrame *pic;
bool use_hwdec;
struct hwdec_info hwdec; // valid only if use_hwdec==true
AVRational codec_timebase;
enum AVDiscard skip_frame;
bool flushing;
struct lavc_state state;
const char *decoder;
bool hwdec_requested;
bool hwdec_failed;
bool hwdec_notified;
bool intra_only;
int framedrop_flags;
bool hw_probing;
struct demux_packet **sent_packets;
int num_sent_packets;
struct demux_packet **requeue_packets;
int num_requeue_packets;
struct mp_image **delay_queue;
int num_delay_queue;
int max_delay_queue;
// From VO
struct vo *vo;
struct mp_hwdec_devices *hwdec_devs;
// Wrapped AVHWDeviceContext* used for decoding.
AVBufferRef *hwdec_dev;
bool hwdec_request_reinit;
int hwdec_fail_count;
struct mp_image_pool *hwdec_swpool;
AVBufferRef *cached_hw_frames_ctx;
// --- The following fields are protected by dr_lock.
pthread_mutex_t dr_lock;
bool dr_failed;
struct mp_image_pool *dr_pool;
int dr_imgfmt, dr_w, dr_h, dr_stride_align;
struct mp_decoder public;
} vd_ffmpeg_ctx;
enum {
HWDEC_FLAG_AUTO = (1 << 0), // prioritize in autoprobe order
HWDEC_FLAG_WHITELIST = (1 << 1), // whitelist for auto-safe
};
struct autoprobe_info {
const char *method_name;
unsigned int flags; // HWDEC_FLAG_*
};
// Things not included in this list will be tried last, in random order.
const struct autoprobe_info hwdec_autoprobe_info[] = {
{"d3d11va", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{"dxva2", HWDEC_FLAG_AUTO},
{"dxva2-copy", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{"d3d11va-copy", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{"nvdec", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{"nvdec-copy", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{"vaapi", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{"vaapi-copy", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{"vdpau", HWDEC_FLAG_AUTO},
{"vdpau-copy", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{"mmal", HWDEC_FLAG_AUTO},
{"mmal-copy", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{"videotoolbox", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{"videotoolbox-copy", HWDEC_FLAG_AUTO | HWDEC_FLAG_WHITELIST},
{0}
};
static int hwdec_compare(const void *p1, const void *p2)
{
struct hwdec_info *h1 = (void *)p1;
struct hwdec_info *h2 = (void *)p2;
if (h1 == h2)
return 0;
// Strictly put non-preferred hwdecs to the end of the list.
if ((h1->auto_pos == INT_MAX) != (h2->auto_pos == INT_MAX))
return h1->auto_pos == INT_MAX ? 1 : -1;
// List non-copying entries first, so --hwdec=auto takes them.
if (h1->copying != h2->copying)
return h1->copying ? 1 : -1;
// Order by autoprobe preferrence order.
if (h1->auto_pos != h2->auto_pos)
return h1->auto_pos > h2->auto_pos ? 1 : -1;
// Fallback sort order to make sorting stable.
return h1->rank > h2->rank ? 1 :-1;
}
// (This takes care of some bookkeeping too, like setting info.name)
static void add_hwdec_item(struct hwdec_info **infos, int *num_infos,
struct hwdec_info info)
{
if (info.copying)
mp_snprintf_cat(info.method_name, sizeof(info.method_name), "-copy");
// (Including the codec name in case this is a wrapper looks pretty dumb,
// but better not have them clash with hwaccels and others.)
snprintf(info.name, sizeof(info.name), "%s-%s",
info.codec->name, info.method_name);
info.rank = *num_infos;
info.auto_pos = INT_MAX;
for (int x = 0; hwdec_autoprobe_info[x].method_name; x++) {
const struct autoprobe_info *entry = &hwdec_autoprobe_info[x];
if (strcmp(entry->method_name, info.method_name) == 0) {
info.flags |= entry->flags;
if (info.flags & HWDEC_FLAG_AUTO)
info.auto_pos = x;
}
}
MP_TARRAY_APPEND(NULL, *infos, *num_infos, info);
}
static void add_all_hwdec_methods(struct hwdec_info **infos, int *num_infos)
{
const AVCodec *codec = NULL;
void *iter = NULL;
while (1) {
codec = av_codec_iterate(&iter);
if (!codec)
break;
if (codec->type != AVMEDIA_TYPE_VIDEO || !av_codec_is_decoder(codec))
continue;
struct hwdec_info info_template = {
.pix_fmt = AV_PIX_FMT_NONE,
.codec = codec,
};
const char *wrapper = NULL;
if (codec->capabilities & (AV_CODEC_CAP_HARDWARE | AV_CODEC_CAP_HYBRID))
wrapper = codec->wrapper_name;
// A decoder can provide multiple methods. In particular, hwaccels
// provide various methods (e.g. native h264 with vaapi & d3d11), but
// even wrapper decoders could provide multiple methods.
bool found_any = false;
for (int n = 0; ; n++) {
const AVCodecHWConfig *cfg = avcodec_get_hw_config(codec, n);
if (!cfg)
break;
if ((cfg->methods & AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX) ||
(cfg->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
{
struct hwdec_info info = info_template;
info.lavc_device = cfg->device_type;
info.pix_fmt = cfg->pix_fmt;
const char *name = av_hwdevice_get_type_name(cfg->device_type);
assert(name); // API violation by libavcodec
// nvdec hwaccels and the cuvid full decoder clash with their
// naming, so fix it here; we also prefer nvdec for the hwaccel.
if (strcmp(name, "cuda") == 0 && !wrapper)
name = "nvdec";
snprintf(info.method_name, sizeof(info.method_name), "%s", name);
// Usually we want to prefer using hw_frames_ctx for true
// hwaccels only, but we actually don't have any way to detect
// those, so always use hw_frames_ctx if offered.
if (cfg->methods & AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX) {
info.use_hw_frames = true;
} else {
info.use_hw_device = true;
}
// Direct variant.
add_hwdec_item(infos, num_infos, info);
// Copy variant.
info.copying = true;
if (cfg->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX) {
info.use_hw_frames = false;
info.use_hw_device = true;
}
add_hwdec_item(infos, num_infos, info);
found_any = true;
} else if (cfg->methods & AV_CODEC_HW_CONFIG_METHOD_INTERNAL) {
struct hwdec_info info = info_template;
info.pix_fmt = cfg->pix_fmt;
const char *name = wrapper;
if (!name)
name = av_get_pix_fmt_name(info.pix_fmt);
assert(name); // API violation by libavcodec
snprintf(info.method_name, sizeof(info.method_name), "%s", name);
// Direct variant.
add_hwdec_item(infos, num_infos, info);
// Copy variant.
info.copying = true;
info.pix_fmt = AV_PIX_FMT_NONE; // trust it can do sw output
add_hwdec_item(infos, num_infos, info);
found_any = true;
}
}
if (!found_any && wrapper) {
// We _know_ there's something supported here, usually outputting
// sw surfaces. E.g. mediacodec (before hw_device_ctx support).
struct hwdec_info info = info_template;
info.copying = true; // probably
snprintf(info.method_name, sizeof(info.method_name), "%s", wrapper);
add_hwdec_item(infos, num_infos, info);
}
}
qsort(*infos, *num_infos, sizeof(struct hwdec_info), hwdec_compare);
}
static bool hwdec_codec_allowed(struct mp_filter *vd, const char *codec)
{
vd_ffmpeg_ctx *ctx = vd->priv;
bstr s = bstr0(ctx->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 AVBufferRef *hwdec_create_dev(struct mp_filter *vd,
struct hwdec_info *hwdec,
bool autoprobe)
{
vd_ffmpeg_ctx *ctx = vd->priv;
assert(hwdec->lavc_device);
if (hwdec->copying) {
const struct hwcontext_fns *fns =
hwdec_get_hwcontext_fns(hwdec->lavc_device);
if (fns && fns->create_dev) {
struct hwcontext_create_dev_params params = {
.probing = autoprobe,
};
return fns->create_dev(vd->global, vd->log, &params);
} else {
AVBufferRef* ref = NULL;
av_hwdevice_ctx_create(&ref, hwdec->lavc_device, NULL, NULL, 0);
return ref;
}
} else if (ctx->hwdec_devs) {
hwdec_devices_request_all(ctx->hwdec_devs);
return hwdec_devices_get_lavc(ctx->hwdec_devs, hwdec->lavc_device);
}
return NULL;
}
// Select if and which hwdec to use. Also makes sure to get the decode device.
static void select_and_set_hwdec(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
const char *codec = ctx->codec->codec;
m_config_cache_update(ctx->opts_cache);
bstr opt = bstr0(ctx->opts->hwdec_api);
bool hwdec_requested = !bstr_equals0(opt, "no");
bool hwdec_auto_all = bstr_equals0(opt, "auto") ||
bstr_equals0(opt, "yes") ||
bstr_equals0(opt, "");
bool hwdec_auto_safe = bstr_equals0(opt, "auto-safe") ||
bstr_equals0(opt, "auto-copy-safe");
bool hwdec_auto_copy = bstr_equals0(opt, "auto-copy") ||
bstr_equals0(opt, "auto-copy-safe");
bool hwdec_auto = hwdec_auto_all || hwdec_auto_copy || hwdec_auto_safe;
if (!hwdec_requested) {
MP_VERBOSE(vd, "No hardware decoding requested.\n");
} else if (!hwdec_codec_allowed(vd, codec)) {
MP_VERBOSE(vd, "Not trying to use hardware decoding: codec %s is not "
"on whitelist.\n", codec);
} else {
struct hwdec_info *hwdecs = NULL;
int num_hwdecs = 0;
add_all_hwdec_methods(&hwdecs, &num_hwdecs);
ctx->hwdec_requested = true;
for (int n = 0; n < num_hwdecs; n++) {
struct hwdec_info *hwdec = &hwdecs[n];
const char *hw_codec = mp_codec_from_av_codec_id(hwdec->codec->id);
if (!hw_codec || strcmp(hw_codec, codec) != 0)
continue;
if (!hwdec_auto && !(bstr_equals0(opt, hwdec->method_name) ||
bstr_equals0(opt, hwdec->name)))
continue;
if (hwdec_auto_safe && !(hwdec->flags & HWDEC_FLAG_WHITELIST))
continue;
MP_VERBOSE(vd, "Looking at hwdec %s...\n", hwdec->name);
if (hwdec_auto_copy && !hwdec->copying) {
MP_VERBOSE(vd, "Not using this for auto-copy.\n");
continue;
}
if (hwdec->lavc_device) {
ctx->hwdec_dev = hwdec_create_dev(vd, hwdec, hwdec_auto);
if (!ctx->hwdec_dev) {
MP_VERBOSE(vd, "Could not create device.\n");
continue;
}
const struct hwcontext_fns *fns =
hwdec_get_hwcontext_fns(hwdec->lavc_device);
if (fns && fns->is_emulated && fns->is_emulated(ctx->hwdec_dev)) {
if (hwdec_auto) {
MP_VERBOSE(vd, "Not using emulated API.\n");
av_buffer_unref(&ctx->hwdec_dev);
continue;
}
MP_WARN(vd, "Using emulated hardware decoding API.\n");
}
} else if (!hwdec->copying) {
// Most likely METHOD_INTERNAL, which often use delay-loaded
// VO support as well.
if (ctx->hwdec_devs)
hwdec_devices_request_all(ctx->hwdec_devs);
}
ctx->use_hwdec = true;
ctx->hwdec = *hwdec;
break;
}
talloc_free(hwdecs);
if (!ctx->use_hwdec)
MP_VERBOSE(vd, "No hardware decoding available for this codec.\n");
}
if (ctx->use_hwdec) {
MP_VERBOSE(vd, "Trying hardware decoding via %s.\n", ctx->hwdec.name);
if (strcmp(ctx->decoder, ctx->hwdec.codec->name) != 0)
MP_VERBOSE(vd, "Using underlying hw-decoder '%s'\n",
ctx->hwdec.codec->name);
} else {
MP_VERBOSE(vd, "Using software decoding.\n");
}
}
static int hwdec_validate_opt(struct mp_log *log, const m_option_t *opt,
struct bstr name, struct bstr param)
{
if (bstr_equals0(param, "help")) {
struct hwdec_info *hwdecs = NULL;
int num_hwdecs = 0;
add_all_hwdec_methods(&hwdecs, &num_hwdecs);
mp_info(log, "Valid values (with alternative full names):\n");
for (int n = 0; n < num_hwdecs; n++) {
struct hwdec_info *hwdec = &hwdecs[n];
mp_info(log, " %s (%s)\n", hwdec->method_name, hwdec->name);
}
talloc_free(hwdecs);
mp_info(log, " auto (yes '')\n");
mp_info(log, " no\n");
mp_info(log, " auto-safe\n");
mp_info(log, " auto-copy\n");
mp_info(log, " auto-copy-safe\n");
return M_OPT_EXIT;
}
return 0;
}
static void force_fallback(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
uninit_avctx(vd);
int lev = ctx->hwdec_notified ? MSGL_WARN : MSGL_V;
mp_msg(vd->log, lev, "Falling back to software decoding.\n");
init_avctx(vd);
}
static void reinit(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
uninit_avctx(vd);
select_and_set_hwdec(vd);
bool use_hwdec = ctx->use_hwdec;
init_avctx(vd);
if (!ctx->avctx && use_hwdec)
force_fallback(vd);
}
static void init_avctx(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
struct vd_lavc_params *lavc_param = ctx->opts;
struct mp_codec_params *c = ctx->codec;
m_config_cache_update(ctx->opts_cache);
assert(!ctx->avctx);
const AVCodec *lavc_codec = NULL;
if (ctx->use_hwdec) {
lavc_codec = ctx->hwdec.codec;
} else {
lavc_codec = avcodec_find_decoder_by_name(ctx->decoder);
}
if (!lavc_codec)
return;
const AVCodecDescriptor *desc = avcodec_descriptor_get(lavc_codec->id);
ctx->intra_only = desc && (desc->props & AV_CODEC_PROP_INTRA_ONLY);
ctx->codec_timebase = mp_get_codec_timebase(ctx->codec);
// This decoder does not read pkt_timebase correctly yet.
if (strstr(lavc_codec->name, "_mmal"))
ctx->codec_timebase = (AVRational){1, 1000000};
ctx->hwdec_failed = false;
ctx->hwdec_request_reinit = false;
ctx->avctx = avcodec_alloc_context3(lavc_codec);
AVCodecContext *avctx = ctx->avctx;
if (!ctx->avctx)
goto error;
avctx->codec_type = AVMEDIA_TYPE_VIDEO;
avctx->codec_id = lavc_codec->id;
avctx->pkt_timebase = ctx->codec_timebase;
ctx->pic = av_frame_alloc();
if (!ctx->pic)
goto error;
if (ctx->use_hwdec) {
avctx->opaque = vd;
avctx->thread_count = 1;
avctx->hwaccel_flags |= AV_HWACCEL_FLAG_IGNORE_LEVEL;
if (!lavc_param->check_hw_profile)
avctx->hwaccel_flags |= AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH;
if (ctx->hwdec.use_hw_device) {
if (ctx->hwdec_dev)
avctx->hw_device_ctx = av_buffer_ref(ctx->hwdec_dev);
if (!avctx->hw_device_ctx)
goto error;
}
if (ctx->hwdec.use_hw_frames) {
if (!ctx->hwdec_dev)
goto error;
}
if (ctx->hwdec.pix_fmt != AV_PIX_FMT_NONE)
avctx->get_format = get_format_hwdec;
// Some APIs benefit from this, for others it's additional bloat.
if (ctx->hwdec.copying)
ctx->max_delay_queue = HWDEC_DELAY_QUEUE_COUNT;
ctx->hw_probing = true;
} else {
mp_set_avcodec_threads(vd->log, avctx, lavc_param->threads);
}
if (!ctx->use_hwdec && ctx->vo && lavc_param->dr) {
avctx->opaque = vd;
avctx->get_buffer2 = get_buffer2_direct;
avctx->thread_safe_callbacks = 1;
}
avctx->flags |= lavc_param->bitexact ? AV_CODEC_FLAG_BITEXACT : 0;
avctx->flags2 |= lavc_param->fast ? AV_CODEC_FLAG2_FAST : 0;
if (lavc_param->show_all)
avctx->flags |= AV_CODEC_FLAG_OUTPUT_CORRUPT;
avctx->skip_loop_filter = lavc_param->skip_loop_filter;
avctx->skip_idct = lavc_param->skip_idct;
avctx->skip_frame = lavc_param->skip_frame;
if (lavc_codec->id == AV_CODEC_ID_H264 && lavc_param->old_x264)
av_opt_set(avctx, "x264_build", "150", AV_OPT_SEARCH_CHILDREN);
mp_set_avopts(vd->log, avctx, lavc_param->avopts);
// Do this after the above avopt handling in case it changes values
ctx->skip_frame = avctx->skip_frame;
if (mp_set_avctx_codec_headers(avctx, c) < 0) {
MP_ERR(vd, "Could not set codec parameters.\n");
goto error;
}
/* open it */
if (avcodec_open2(avctx, lavc_codec, NULL) < 0)
goto error;
// Sometimes, the first packet contains information required for correct
// decoding of the rest of the stream. The only currently known case is the
// x264 build number (encoded in a SEI element), needed to enable a
// workaround for broken 4:4:4 streams produced by older x264 versions.
if (lavc_codec->id == AV_CODEC_ID_H264 && c->first_packet) {
AVPacket avpkt;
mp_set_av_packet(&avpkt, c->first_packet, &ctx->codec_timebase);
avcodec_send_packet(avctx, &avpkt);
avcodec_receive_frame(avctx, ctx->pic);
av_frame_unref(ctx->pic);
avcodec_flush_buffers(ctx->avctx);
}
return;
error:
MP_ERR(vd, "Could not open codec.\n");
uninit_avctx(vd);
}
static void reset_avctx(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
if (ctx->avctx && avcodec_is_open(ctx->avctx))
avcodec_flush_buffers(ctx->avctx);
ctx->flushing = false;
ctx->hwdec_request_reinit = false;
}
static void flush_all(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
for (int n = 0; n < ctx->num_delay_queue; n++)
talloc_free(ctx->delay_queue[n]);
ctx->num_delay_queue = 0;
for (int n = 0; n < ctx->num_sent_packets; n++)
talloc_free(ctx->sent_packets[n]);
ctx->num_sent_packets = 0;
for (int n = 0; n < ctx->num_requeue_packets; n++)
talloc_free(ctx->requeue_packets[n]);
ctx->num_requeue_packets = 0;
reset_avctx(vd);
}
static void uninit_avctx(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
flush_all(vd);
av_frame_free(&ctx->pic);
av_buffer_unref(&ctx->cached_hw_frames_ctx);
avcodec_free_context(&ctx->avctx);
av_buffer_unref(&ctx->hwdec_dev);
ctx->hwdec_failed = false;
ctx->hwdec_fail_count = 0;
ctx->max_delay_queue = 0;
ctx->hw_probing = false;
ctx->hwdec = (struct hwdec_info){0};
ctx->use_hwdec = false;
}
static int init_generic_hwaccel(struct mp_filter *vd, enum AVPixelFormat hw_fmt)
{
struct lavc_ctx *ctx = vd->priv;
AVBufferRef *new_frames_ctx = NULL;
if (!ctx->hwdec.use_hw_frames)
return 0;
if (!ctx->hwdec_dev) {
MP_ERR(ctx, "Missing device context.\n");
goto error;
}
if (avcodec_get_hw_frames_parameters(ctx->avctx,
ctx->hwdec_dev, hw_fmt, &new_frames_ctx) < 0)
{
MP_VERBOSE(ctx, "Hardware decoding of this stream is unsupported?\n");
goto error;
}
AVHWFramesContext *new_fctx = (void *)new_frames_ctx->data;
if (ctx->opts->hwdec_image_format)
new_fctx->sw_format = imgfmt2pixfmt(ctx->opts->hwdec_image_format);
// 1 surface is already included by libavcodec. The field is 0 if the
// hwaccel supports dynamic surface allocation.
if (new_fctx->initial_pool_size)
new_fctx->initial_pool_size += ctx->opts->hwdec_extra_frames - 1;
const struct hwcontext_fns *fns =
hwdec_get_hwcontext_fns(new_fctx->device_ctx->type);
if (fns && fns->refine_hwframes)
fns->refine_hwframes(new_frames_ctx);
// We might be able to reuse a previously allocated frame pool.
if (ctx->cached_hw_frames_ctx) {
AVHWFramesContext *old_fctx = (void *)ctx->cached_hw_frames_ctx->data;
if (new_fctx->format != old_fctx->format ||
new_fctx->sw_format != old_fctx->sw_format ||
new_fctx->width != old_fctx->width ||
new_fctx->height != old_fctx->height ||
new_fctx->initial_pool_size != old_fctx->initial_pool_size)
av_buffer_unref(&ctx->cached_hw_frames_ctx);
}
if (!ctx->cached_hw_frames_ctx) {
if (av_hwframe_ctx_init(new_frames_ctx) < 0) {
MP_ERR(ctx, "Failed to allocate hw frames.\n");
goto error;
}
ctx->cached_hw_frames_ctx = new_frames_ctx;
new_frames_ctx = NULL;
}
ctx->avctx->hw_frames_ctx = av_buffer_ref(ctx->cached_hw_frames_ctx);
if (!ctx->avctx->hw_frames_ctx)
goto error;
av_buffer_unref(&new_frames_ctx);
return 0;
error:
av_buffer_unref(&new_frames_ctx);
av_buffer_unref(&ctx->cached_hw_frames_ctx);
return -1;
}
static enum AVPixelFormat get_format_hwdec(struct AVCodecContext *avctx,
const enum AVPixelFormat *fmt)
{
struct mp_filter *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");
const char *profile = avcodec_profile_name(avctx->codec_id, avctx->profile);
MP_VERBOSE(vd, "Codec profile: %s (0x%x)\n", profile ? profile : "unknown",
avctx->profile);
assert(ctx->use_hwdec);
ctx->hwdec_request_reinit |= ctx->hwdec_failed;
ctx->hwdec_failed = false;
enum AVPixelFormat select = AV_PIX_FMT_NONE;
for (int i = 0; fmt[i] != AV_PIX_FMT_NONE; i++) {
if (ctx->hwdec.pix_fmt == fmt[i]) {
if (init_generic_hwaccel(vd, fmt[i]) < 0)
break;
select = fmt[i];
break;
}
}
if (select == AV_PIX_FMT_NONE) {
ctx->hwdec_failed = true;
select = avcodec_default_get_format(avctx, fmt);
}
const char *name = av_get_pix_fmt_name(select);
MP_VERBOSE(vd, "Requesting pixfmt '%s' from decoder.\n", name ? name : "-");
return select;
}
static int get_buffer2_direct(AVCodecContext *avctx, AVFrame *pic, int flags)
{
struct mp_filter *vd = avctx->opaque;
vd_ffmpeg_ctx *p = vd->priv;
pthread_mutex_lock(&p->dr_lock);
int w = pic->width;
int h = pic->height;
int linesize_align[AV_NUM_DATA_POINTERS] = {0};
avcodec_align_dimensions2(avctx, &w, &h, linesize_align);
// We assume that different alignments are just different power-of-2s.
// Thus, a higher alignment always satisfies a lower alignment.
int stride_align = MP_IMAGE_BYTE_ALIGN;
for (int n = 0; n < AV_NUM_DATA_POINTERS; n++)
stride_align = MPMAX(stride_align, linesize_align[n]);
int imgfmt = pixfmt2imgfmt(pic->format);
if (!imgfmt)
goto fallback;
if (p->dr_failed)
goto fallback;
// (For simplicity, we realloc on any parameter change, instead of trying
// to be clever.)
if (stride_align != p->dr_stride_align || w != p->dr_w || h != p->dr_h ||
imgfmt != p->dr_imgfmt)
{
mp_image_pool_clear(p->dr_pool);
p->dr_imgfmt = imgfmt;
p->dr_w = w;
p->dr_h = h;
p->dr_stride_align = stride_align;
MP_DBG(p, "DR parameter change to %dx%d %s align=%d\n", w, h,
mp_imgfmt_to_name(imgfmt), stride_align);
}
struct mp_image *img = mp_image_pool_get_no_alloc(p->dr_pool, imgfmt, w, h);
if (!img) {
MP_DBG(p, "Allocating new DR image...\n");
img = vo_get_image(p->vo, imgfmt, w, h, stride_align);
if (!img) {
MP_DBG(p, "...failed..\n");
goto fallback;
}
// Now make the mp_image part of the pool. This requires doing magic to
// the image, so just add it to the pool and get it back to avoid
// dealing with magic ourselves. (Normally this never fails.)
mp_image_pool_add(p->dr_pool, img);
img = mp_image_pool_get_no_alloc(p->dr_pool, imgfmt, w, h);
if (!img)
goto fallback;
}
// get_buffer2 callers seem very unappreciative of overwriting pic with a
// new reference. The AVCodecContext.get_buffer2 comments tell us exactly
// what we should do, so follow that.
for (int n = 0; n < 4; n++) {
pic->data[n] = img->planes[n];
pic->linesize[n] = img->stride[n];
pic->buf[n] = img->bufs[n];
img->bufs[n] = NULL;
}
talloc_free(img);
pthread_mutex_unlock(&p->dr_lock);
return 0;
fallback:
if (!p->dr_failed)
MP_VERBOSE(p, "DR failed - disabling.\n");
p->dr_failed = true;
pthread_mutex_unlock(&p->dr_lock);
return avcodec_default_get_buffer2(avctx, pic, flags);
}
static void prepare_decoding(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
AVCodecContext *avctx = ctx->avctx;
struct vd_lavc_params *opts = ctx->opts;
if (!avctx)
return;
int drop = ctx->framedrop_flags;
if (drop == 1) {
avctx->skip_frame = opts->framedrop; // normal framedrop
} else if (drop == 2) {
avctx->skip_frame = AVDISCARD_NONREF; // hr-seek framedrop
// Can be much more aggressive for true intra codecs.
if (ctx->intra_only)
avctx->skip_frame = AVDISCARD_ALL;
} else {
avctx->skip_frame = ctx->skip_frame; // normal playback
}
if (ctx->hwdec_request_reinit)
reset_avctx(vd);
}
static void handle_err(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
struct vd_lavc_params *opts = ctx->opts;
MP_WARN(vd, "Error while decoding frame%s!\n",
ctx->use_hwdec ? " (hardware decoding)" : "");
if (ctx->use_hwdec) {
ctx->hwdec_fail_count += 1;
if (ctx->hwdec_fail_count >= opts->software_fallback)
ctx->hwdec_failed = true;
}
}
static int send_packet(struct mp_filter *vd, struct demux_packet *pkt)
{
vd_ffmpeg_ctx *ctx = vd->priv;
AVCodecContext *avctx = ctx->avctx;
if (ctx->num_requeue_packets && ctx->requeue_packets[0] != pkt)
return AVERROR(EAGAIN); // cannot consume the packet
if (ctx->hwdec_failed)
return AVERROR(EAGAIN);
if (!ctx->avctx)
return AVERROR_EOF;
prepare_decoding(vd);
if (avctx->skip_frame == AVDISCARD_ALL)
return 0;
AVPacket avpkt;
mp_set_av_packet(&avpkt, pkt, &ctx->codec_timebase);
int ret = avcodec_send_packet(avctx, pkt ? &avpkt : NULL);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
return ret;
if (ctx->hw_probing && ctx->num_sent_packets < 32 &&
ctx->opts->software_fallback <= 32)
{
pkt = pkt ? demux_copy_packet(pkt) : NULL;
MP_TARRAY_APPEND(ctx, ctx->sent_packets, ctx->num_sent_packets, pkt);
}
if (ret < 0)
handle_err(vd);
return ret;
}
static void send_queued_packet(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
assert(ctx->num_requeue_packets);
assert(!ctx->hw_probing);
if (send_packet(vd, ctx->requeue_packets[0]) != AVERROR(EAGAIN)) {
talloc_free(ctx->requeue_packets[0]);
MP_TARRAY_REMOVE_AT(ctx->requeue_packets, ctx->num_requeue_packets, 0);
}
}
// Returns whether decoder is still active (!EOF state).
static int decode_frame(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
AVCodecContext *avctx = ctx->avctx;
if (!avctx)
return AVERROR_EOF;
prepare_decoding(vd);
// Re-send old packets (typically after a hwdec fallback during init).
if (ctx->num_requeue_packets)
send_queued_packet(vd);
int ret = avcodec_receive_frame(avctx, ctx->pic);
if (ret < 0) {
if (ret == AVERROR_EOF) {
// If flushing was initialized earlier and has ended now, make it
// start over in case we get new packets at some point in the future.
// This must take the delay queue into account, so avctx returns EOF
// until the delay queue has been drained.
if (!ctx->num_delay_queue)
reset_avctx(vd);
} else if (ret == AVERROR(EAGAIN)) {
// just retry after caller writes a packet
} else {
handle_err(vd);
}
return ret;
}
// If something was decoded successfully, it must return a frame with valid
// data.
assert(ctx->pic->buf[0]);
struct mp_image *mpi = mp_image_from_av_frame(ctx->pic);
if (!mpi) {
av_frame_unref(ctx->pic);
return ret;
}
if (mpi->imgfmt == IMGFMT_CUDA && !mpi->planes[0]) {
MP_ERR(vd, "CUDA frame without data. This is a FFmpeg bug.\n");
talloc_free(mpi);
handle_err(vd);
return AVERROR_BUG;
}
ctx->hwdec_fail_count = 0;
mpi->pts = mp_pts_from_av(ctx->pic->pts, &ctx->codec_timebase);
mpi->dts = mp_pts_from_av(ctx->pic->pkt_dts, &ctx->codec_timebase);
mpi->pkt_duration =
mp_pts_from_av(ctx->pic->pkt_duration, &ctx->codec_timebase);
av_frame_unref(ctx->pic);
MP_TARRAY_APPEND(ctx, ctx->delay_queue, ctx->num_delay_queue, mpi);
return ret;
}
static int receive_frame(struct mp_filter *vd, struct mp_frame *out_frame)
{
vd_ffmpeg_ctx *ctx = vd->priv;
int ret = decode_frame(vd);
if (ctx->hwdec_failed) {
// Failed hardware decoding? Try again in software.
struct demux_packet **pkts = ctx->sent_packets;
int num_pkts = ctx->num_sent_packets;
ctx->sent_packets = NULL;
ctx->num_sent_packets = 0;
force_fallback(vd);
ctx->requeue_packets = pkts;
ctx->num_requeue_packets = num_pkts;
return 0; // force retry
}
if (ret == AVERROR(EAGAIN) && ctx->num_requeue_packets)
return 0; // force retry, so send_queued_packet() gets called
if (!ctx->num_delay_queue)
return ret;
if (ctx->num_delay_queue <= ctx->max_delay_queue && ret != AVERROR_EOF)
return AVERROR(EAGAIN);
struct mp_image *res = ctx->delay_queue[0];
MP_TARRAY_REMOVE_AT(ctx->delay_queue, ctx->num_delay_queue, 0);
res = res ? mp_img_swap_to_native(res) : NULL;
if (!res)
return AVERROR_UNKNOWN;
if (ctx->use_hwdec && ctx->hwdec.copying && res->hwctx) {
struct mp_image *sw = mp_image_hw_download(res, ctx->hwdec_swpool);
mp_image_unrefp(&res);
res = sw;
if (!res) {
MP_ERR(vd, "Could not copy back hardware decoded frame.\n");
ctx->hwdec_fail_count = INT_MAX - 1; // force fallback
handle_err(vd);
return AVERROR_UNKNOWN;
}
}
if (!ctx->hwdec_notified && ctx->hwdec_requested) {
if (ctx->use_hwdec) {
MP_INFO(vd, "Using hardware decoding (%s).\n",
ctx->hwdec.method_name);
} else {
MP_VERBOSE(vd, "Using software decoding.\n");
}
ctx->hwdec_notified = true;
}
if (ctx->hw_probing) {
for (int n = 0; n < ctx->num_sent_packets; n++)
talloc_free(ctx->sent_packets[n]);
ctx->num_sent_packets = 0;
ctx->hw_probing = false;
}
*out_frame = MAKE_FRAME(MP_FRAME_VIDEO, res);
return 0;
}
static int control(struct mp_filter *vd, enum dec_ctrl cmd, void *arg)
{
vd_ffmpeg_ctx *ctx = vd->priv;
switch (cmd) {
case VDCTRL_SET_FRAMEDROP:
ctx->framedrop_flags = *(int *)arg;
return CONTROL_TRUE;
case VDCTRL_GET_BFRAMES: {
AVCodecContext *avctx = ctx->avctx;
if (!avctx)
break;
if (ctx->use_hwdec && strcmp(ctx->hwdec.method_name, "mmal") == 0)
break; // MMAL has arbitrary buffering, thus unknown
*(int *)arg = avctx->has_b_frames;
return CONTROL_TRUE;
}
case VDCTRL_GET_HWDEC: {
*(char **)arg = ctx->use_hwdec ? ctx->hwdec.method_name : NULL;
return CONTROL_TRUE;
}
case VDCTRL_FORCE_HWDEC_FALLBACK:
if (ctx->use_hwdec) {
force_fallback(vd);
return ctx->avctx ? CONTROL_OK : CONTROL_ERROR;
}
return CONTROL_FALSE;
case VDCTRL_REINIT:
reinit(vd);
return CONTROL_TRUE;
}
return CONTROL_UNKNOWN;
}
static void process(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
lavc_process(vd, &ctx->state, send_packet, receive_frame);
}
static void reset(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
flush_all(vd);
ctx->state = (struct lavc_state){0};
ctx->framedrop_flags = 0;
}
static void destroy(struct mp_filter *vd)
{
vd_ffmpeg_ctx *ctx = vd->priv;
uninit_avctx(vd);
pthread_mutex_destroy(&ctx->dr_lock);
}
static const struct mp_filter_info vd_lavc_filter = {
.name = "vd_lavc",
.priv_size = sizeof(vd_ffmpeg_ctx),
.process = process,
.reset = reset,
.destroy = destroy,
};
static struct mp_decoder *create(struct mp_filter *parent,
struct mp_codec_params *codec,
const char *decoder)
{
struct mp_filter *vd = mp_filter_create(parent, &vd_lavc_filter);
if (!vd)
return NULL;
mp_filter_add_pin(vd, MP_PIN_IN, "in");
mp_filter_add_pin(vd, MP_PIN_OUT, "out");
vd->log = mp_log_new(vd, parent->log, NULL);
vd_ffmpeg_ctx *ctx = vd->priv;
ctx->log = vd->log;
ctx->opts_cache = m_config_cache_alloc(ctx, vd->global, &vd_lavc_conf);
ctx->opts = ctx->opts_cache->opts;
ctx->codec = codec;
ctx->decoder = talloc_strdup(ctx, decoder);
ctx->hwdec_swpool = mp_image_pool_new(ctx);
ctx->dr_pool = mp_image_pool_new(ctx);
ctx->public.f = vd;
ctx->public.control = control;
pthread_mutex_init(&ctx->dr_lock, NULL);
// hwdec/DR
struct mp_stream_info *info = mp_filter_find_stream_info(vd);
if (info) {
ctx->hwdec_devs = info->hwdec_devs;
ctx->vo = info->dr_vo;
}
reinit(vd);
if (!ctx->avctx) {
talloc_free(vd);
return NULL;
}
return &ctx->public;
}
static void add_decoders(struct mp_decoder_list *list)
{
mp_add_lavc_decoders(list, AVMEDIA_TYPE_VIDEO);
}
const struct mp_decoder_fns vd_lavc = {
.create = create,
.add_decoders = add_decoders,
};
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