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/*
* Copyright (C) 2023 Mikhail Burakov. This file is part of receiver.
*
* receiver 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 3 of the License, or
* (at your option) any later version.
*
* receiver 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 receiver. If not, see <https://www.gnu.org/licenses/>.
*/
#include "decode.h"
#include <errno.h>
#include <fcntl.h>
#include <mfxvideo.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <va/va.h>
#include <va/va_drm.h>
#include <va/va_drmcommon.h>
#include "frame.h"
#include "util.h"
struct Surface {
VASurfaceID surface_id;
mfxFrameInfo frame_info;
struct Frame* frame;
bool locked;
};
struct DecodeContext {
int drm_fd;
VADisplay display;
mfxSession session;
mfxFrameAllocator allocator;
bool initialized;
uint32_t packet_size;
uint8_t* packet_data;
uint32_t packet_alloc;
uint32_t packet_offset;
struct Surface** sufaces;
struct Frame* decoded;
};
static void SurfaceDestroy(struct Surface*** psurfaces) {
if (!psurfaces || !*psurfaces) return;
for (struct Surface** surfaces = *psurfaces; *surfaces; surfaces++) {
if ((*surfaces)->frame) FrameDestroy(&(*surfaces)->frame);
free(*surfaces);
}
free(*psurfaces);
*psurfaces = NULL;
}
static struct Frame* ExportFrame(VADisplay display, VASurfaceID surface_id) {
VADRMPRIMESurfaceDescriptor prime;
VAStatus status = vaExportSurfaceHandle(
display, surface_id, VA_SURFACE_ATTRIB_MEM_TYPE_DRM_PRIME_2,
VA_EXPORT_SURFACE_WRITE_ONLY | VA_EXPORT_SURFACE_COMPOSED_LAYERS, &prime);
if (status != VA_STATUS_SUCCESS) {
LOG("Failed to export vaapi surface (%d)", status);
return NULL;
}
struct FramePlane planes[prime.layers[0].num_planes];
for (size_t i = 0; i < LENGTH(planes); i++) {
planes[i] = (struct FramePlane){
.dmabuf_fd = prime.objects[prime.layers[0].object_index[i]].fd,
.pitch = prime.layers[0].pitch[i],
.offset = prime.layers[0].offset[i],
.modifier =
prime.objects[prime.layers[0].object_index[i]].drm_format_modifier,
};
}
struct Frame* frame = FrameCreate(prime.width, prime.height, prime.fourcc,
prime.layers[0].num_planes, planes);
if (!frame) LOG("Failed to create frame");
for (size_t i = prime.num_objects; i; i--) close(prime.objects[i - 1].fd);
return frame;
}
static mfxStatus OnAllocatorAlloc(mfxHDL pthis, mfxFrameAllocRequest* request,
mfxFrameAllocResponse* response) {
LOG("%s(AllocId=%u, NumFrameSuggested=%u)", __func__, request->AllocId,
request->NumFrameSuggested);
if (request->Info.FourCC != MFX_FOURCC_NV12) {
LOG("Allocation of %.4s surfaces is not supported",
(const char*)&request->Info.FourCC);
return MFX_ERR_UNSUPPORTED;
}
if (request->Info.ChromaFormat != MFX_CHROMAFORMAT_YUV420) {
LOG("Chroma format %u is not supported", request->Info.ChromaFormat);
return MFX_ERR_UNSUPPORTED;
}
struct AUTO(Surface)** surfaces =
calloc(request->NumFrameSuggested + 1, sizeof(struct Surface*));
if (!surfaces) {
LOG("Failed to allocate surfaces storage (%s)", strerror(errno));
return MFX_ERR_MEMORY_ALLOC;
}
for (size_t i = 0; i < request->NumFrameSuggested; i++) {
surfaces[i] = calloc(1, sizeof(struct Surface));
if (!surfaces[i]) {
LOG("Failed to allocate surface (%s)", strerror(errno));
return MFX_ERR_MEMORY_ALLOC;
}
}
VASurfaceID surface_ids[request->NumFrameSuggested];
struct DecodeContext* decode_context = pthis;
VASurfaceAttrib attrib_list[] = {
{.type = VASurfaceAttribPixelFormat,
.value.type = VAGenericValueTypeInteger,
.value.value.i = VA_FOURCC_NV12},
{.type = VASurfaceAttribUsageHint,
.value.type = VAGenericValueTypeInteger,
.value.value.i = VA_SURFACE_ATTRIB_USAGE_HINT_DECODER |
VA_SURFACE_ATTRIB_USAGE_HINT_EXPORT},
};
VAStatus status = vaCreateSurfaces(
decode_context->display, VA_RT_FORMAT_YUV420, request->Info.Width,
request->Info.Height, surface_ids, request->NumFrameSuggested,
attrib_list, LENGTH(attrib_list));
if (status != VA_STATUS_SUCCESS) {
LOG("Failed to allocate surfaces (%d)", status);
return MFX_ERR_MEMORY_ALLOC;
}
for (size_t i = 0; i < request->NumFrameSuggested; i++) {
surfaces[i]->surface_id = surface_ids[i];
surfaces[i]->frame_info = request->Info;
}
// mburakov: Separate loop for frames to ensure proper cleanup in destructor.
for (size_t i = 0; i < request->NumFrameSuggested; i++) {
surfaces[i]->frame =
ExportFrame(decode_context->display, surfaces[i]->surface_id);
if (!surfaces[i]->frame) {
LOG("Failed to export frame");
return MFX_ERR_MEMORY_ALLOC;
}
}
decode_context->sufaces = RELEASE(surfaces);
*response = (mfxFrameAllocResponse){
.AllocId = request->AllocId,
.mids = (void**)decode_context->sufaces,
.NumFrameActual = request->NumFrameSuggested,
};
return MFX_ERR_NONE;
}
static mfxStatus OnAllocatorGetHDL(mfxHDL pthis, mfxMemId mid, mfxHDL* handle) {
(void)pthis;
struct Surface* surface = mid;
*handle = &surface->surface_id;
return MFX_ERR_NONE;
}
static mfxStatus OnAllocatorFree(mfxHDL pthis,
mfxFrameAllocResponse* response) {
LOG("%s(AllocId=%u)", __func__, response->AllocId);
VASurfaceID surface_ids[response->NumFrameActual];
struct Surface** surfaces = (struct Surface**)response->mids;
for (size_t i = 0; i < response->NumFrameActual; i++)
surface_ids[i] = surfaces[i]->surface_id;
struct DecodeContext* decode_context = pthis;
vaDestroySurfaces(decode_context->display, surface_ids,
response->NumFrameActual);
SurfaceDestroy(&decode_context->sufaces);
return MFX_ERR_NONE;
}
struct DecodeContext* DecodeContextCreate(void) {
struct AUTO(DecodeContext)* decode_context =
malloc(sizeof(struct DecodeContext));
if (!decode_context) {
LOG("Failed to allocate decode context (%s)", strerror(errno));
return NULL;
}
*decode_context = (struct DecodeContext){
.drm_fd = -1,
.allocator.pthis = decode_context,
.allocator.Alloc = OnAllocatorAlloc,
.allocator.GetHDL = OnAllocatorGetHDL,
.allocator.Free = OnAllocatorFree,
};
decode_context->drm_fd = open("/dev/dri/renderD128", O_RDWR);
if (decode_context->drm_fd == -1) {
LOG("Failed to open render node (%s)", strerror(errno));
return NULL;
}
decode_context->display = vaGetDisplayDRM(decode_context->drm_fd);
if (!decode_context->display) {
LOG("Failed to get vaapi display (%s)", strerror(errno));
return NULL;
}
int major, minor;
VAStatus st = vaInitialize(decode_context->display, &major, &minor);
if (st != VA_STATUS_SUCCESS) {
LOG("Failed to init vaapi (%d)", st);
return NULL;
}
LOG("Initialized vaapi %d.%d", major, minor);
mfxStatus status = MFXInit(MFX_IMPL_HARDWARE, NULL, &decode_context->session);
if (status != MFX_ERR_NONE) {
LOG("Failed to init mfx session (%d)", status);
return NULL;
}
status = MFXVideoCORE_SetHandle(
decode_context->session, MFX_HANDLE_VA_DISPLAY, decode_context->display);
if (status != MFX_ERR_NONE) {
LOG("Failed to set mfx session display (%d)", status);
return NULL;
}
status = MFXVideoCORE_SetFrameAllocator(decode_context->session,
&decode_context->allocator);
if (status != MFX_ERR_NONE) {
LOG("Failed to set frame allocator (%d)", status);
return NULL;
}
return RELEASE(decode_context);
}
static bool InitializeDecoder(struct DecodeContext* decode_context,
mfxBitstream* bitstream) {
mfxVideoParam video_param = {
.mfx.CodecId = MFX_CODEC_AVC,
};
mfxStatus status = MFXVideoDECODE_DecodeHeader(decode_context->session,
bitstream, &video_param);
switch (status) {
case MFX_ERR_NONE:
break;
case MFX_ERR_MORE_DATA:
return true;
default:
LOG("Failed to parse decode header (%d)", status);
return false;
}
video_param.AsyncDepth = 1;
video_param.mfx.DecodedOrder = 1;
video_param.IOPattern = MFX_IOPATTERN_OUT_VIDEO_MEMORY;
status =
MFXVideoDECODE_Query(decode_context->session, &video_param, &video_param);
if (status != MFX_ERR_NONE) {
LOG("Failed to query decode (%d)", status);
return false;
}
status = MFXVideoDECODE_Init(decode_context->session, &video_param);
if (status != MFX_ERR_NONE) {
LOG("Failed to init decode (%d)", status);
return false;
}
decode_context->initialized = true;
return true;
}
static bool ReadSomePacketData(struct DecodeContext* decode_context, int fd) {
again:;
void* target;
size_t size;
if (!decode_context->packet_size) {
target = &decode_context->packet_size;
size = sizeof(decode_context->packet_size);
} else {
target = decode_context->packet_data + decode_context->packet_offset;
size = decode_context->packet_size - decode_context->packet_offset;
}
ssize_t result = read(fd, target, size);
switch (result) {
case -1:
if (errno == EINTR) goto again;
LOG("Failed to read packet data (%s)", strerror(errno));
return false;
case 0:
LOG("File descriptor was closed");
return false;
default:
break;
}
if (target != &decode_context->packet_size) {
decode_context->packet_offset += result;
return true;
}
if (result != (ssize_t)size) {
LOG("Failed to read complete packet size");
return false;
}
if (decode_context->packet_size > decode_context->packet_alloc) {
uint32_t packet_alloc = decode_context->packet_size;
uint8_t* packet_data = malloc(packet_alloc);
if (!packet_data) {
LOG("Failed to reallocate packet data (%s)", strerror(errno));
return false;
}
free(decode_context->packet_data);
decode_context->packet_data = packet_data;
decode_context->packet_alloc = packet_alloc;
}
return true;
}
static struct Surface* GetFreeSurface(struct DecodeContext* decode_context) {
struct Surface** psurface = decode_context->sufaces;
for (; *psurface && (*psurface)->locked; psurface++)
;
(*psurface)->locked = true;
return *psurface;
}
static void UnlockAllSurfaces(struct DecodeContext* decode_context,
const struct Surface* keep_locked) {
struct Surface** psurface = decode_context->sufaces;
for (; *psurface; psurface++) {
if (*psurface != keep_locked) (*psurface)->locked = false;
}
}
bool DecodeContextDecode(struct DecodeContext* decode_context, int fd) {
if (!ReadSomePacketData(decode_context, fd)) {
LOG("Failed to read some packet data");
return false;
}
if (decode_context->packet_size != decode_context->packet_offset) {
// mburakov: Full frame has to be available for decoding.
return true;
}
mfxBitstream bitstream = {
.DecodeTimeStamp = MFX_TIMESTAMP_UNKNOWN,
.TimeStamp = (mfxU64)MFX_TIMESTAMP_UNKNOWN,
.Data = decode_context->packet_data,
.DataLength = decode_context->packet_size,
.MaxLength = decode_context->packet_size,
.DataFlag = MFX_BITSTREAM_COMPLETE_FRAME,
};
decode_context->packet_size = 0;
decode_context->packet_offset = 0;
if (!decode_context->initialized) {
if (!InitializeDecoder(decode_context, &bitstream)) {
LOG("Failed to initialize decoder");
return false;
}
// mburakov: Initialization might be postponed.
if (!decode_context->initialized) return true;
}
for (;;) {
struct Surface* surface = GetFreeSurface(decode_context);
mfxFrameSurface1 surface_work = {
.Info = surface->frame_info,
.Data.MemId = surface,
};
mfxFrameSurface1* surface_out = NULL;
mfxSyncPoint sync = NULL;
mfxStatus status =
MFXVideoDECODE_DecodeFrameAsync(decode_context->session, &bitstream,
&surface_work, &surface_out, &sync);
switch (status) {
case MFX_ERR_MORE_SURFACE:
continue;
case MFX_ERR_NONE:
break;
case MFX_WRN_VIDEO_PARAM_CHANGED:
continue;
default:
LOG("Failed to decode frame (%d)", status);
return false;
}
status =
MFXVideoCORE_SyncOperation(decode_context->session, sync, MFX_INFINITE);
if (status != MFX_ERR_NONE) {
LOG("Failed to sync operation (%d)", status);
return false;
}
surface = surface_out->Data.MemId;
decode_context->decoded = surface->frame;
UnlockAllSurfaces(decode_context, surface);
return true;
}
}
const struct Frame* DecodeContextGetFrame(
struct DecodeContext* decode_context) {
return decode_context->decoded;
}
void DecodeContextDestroy(struct DecodeContext** decode_context) {
if (!decode_context || !*decode_context) return;
if ((*decode_context)->packet_data) free((*decode_context)->packet_data);
if ((*decode_context)->session) MFXClose((*decode_context)->session);
if ((*decode_context)->display) vaTerminate((*decode_context)->display);
if ((*decode_context)->drm_fd) close((*decode_context)->drm_fd);
free(*decode_context);
*decode_context = NULL;
}
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