File size: 15,783 Bytes
50f724d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 | import cython
import cython.cimports.libav as lib
from cython.cimports.av.codec.context import CodecContext
from cython.cimports.av.codec.hwaccel import HWAccel
from cython.cimports.av.error import err_check
from cython.cimports.av.frame import Frame
from cython.cimports.av.packet import Packet
from cython.cimports.av.utils import avrational_to_fraction, to_avrational
from cython.cimports.av.video.format import VideoFormat, get_pix_fmt, get_video_format
from cython.cimports.av.video.frame import VideoFrame, alloc_video_frame
from cython.cimports.av.video.reformatter import VideoReformatter
from cython.cimports.libc.stdint import int64_t
@cython.cfunc
@cython.exceptval(check=False)
def _get_hw_format(
ctx: cython.pointer[lib.AVCodecContext],
pix_fmts: cython.pointer[cython.const[lib.AVPixelFormat]],
) -> lib.AVPixelFormat:
# In the case where we requested accelerated decoding, the decoder first calls this function
# with a list that includes both the hardware format and software formats.
# First we try to pick the hardware format if it's in the list.
# However, if the decoder fails to initialize the hardware, it will call this function again,
# with only software formats in pix_fmts. We return ctx->sw_pix_fmt regardless in this case,
# because that should be in the candidate list. If not, we are out of ideas anyways.
private_data: cython.pointer[AVCodecPrivateData] = cython.cast(
cython.pointer[AVCodecPrivateData], ctx.opaque
)
i: cython.int = 0
while pix_fmts[i] != -1:
if pix_fmts[i] == private_data.hardware_pix_fmt:
return pix_fmts[i]
i += 1
return (
ctx.sw_pix_fmt if private_data.allow_software_fallback else lib.AV_PIX_FMT_NONE
)
@cython.final
@cython.cclass
class VideoCodecContext(CodecContext):
@cython.cfunc
def _init(
self,
ptr: cython.pointer[lib.AVCodecContext],
codec: cython.pointer[cython.const[lib.AVCodec]],
hwaccel: HWAccel | None,
):
CodecContext._init(self, ptr, codec, hwaccel)
if hwaccel is None:
return
if self.is_encoder:
# Hardware-accelerated encoding. We only attach the device context here;
# the hardware frames context depends on the final width/height/pixel
# format (set by the user after add_stream()), so it is built lazily in
# CodecContext.open() via _setup_encode_hwframes().
self.hwaccel_ctx = hwaccel.create(self.codec, for_encoding=True)
self.ptr.hw_device_ctx = lib.av_buffer_ref(self.hwaccel_ctx.ptr)
return
try:
self.hwaccel_ctx = hwaccel.create(self.codec)
self.ptr.hw_device_ctx = lib.av_buffer_ref(self.hwaccel_ctx.ptr)
self.ptr.pix_fmt = self.hwaccel_ctx.config.ptr.pix_fmt
self.ptr.get_format = _get_hw_format
self._private_data.hardware_pix_fmt = self.hwaccel_ctx.config.ptr.pix_fmt
self._private_data.allow_software_fallback = (
self.hwaccel.allow_software_fallback
)
self.ptr.opaque = cython.address(self._private_data)
except NotImplementedError:
# Some streams may not have a hardware decoder. For example, many action
# cam videos have a low resolution mjpeg stream, which is usually not
# compatible with hardware decoders.
# The user may have passed in a hwaccel because they want to decode the main
# stream with it, so we shouldn't abort even if we find a stream that can't
# be HW decoded.
# If the user wants to make sure hwaccel is actually used, they can check with the
# is_hwaccel() function on each stream's codec context.
self.hwaccel_ctx = None
@cython.cfunc
def _encode_upload_frame(self, vframe: VideoFrame) -> VideoFrame:
# Upload a software frame onto the device for hardware-accelerated encoding.
frames_ctx: cython.pointer[lib.AVHWFramesContext] = cython.cast(
cython.pointer[lib.AVHWFramesContext], self.ptr.hw_frames_ctx.data
)
# If the user already handed us a matching hardware frame, pass it through.
if vframe.ptr.format == frames_ctx.format:
return vframe
# Convert to the frames context's software format and size before uploading,
# since av_hwframe_transfer_data() does not change pixel format or scale.
if (
vframe.ptr.format != frames_ctx.sw_format
or vframe.ptr.width != frames_ctx.width
or vframe.ptr.height != frames_ctx.height
):
if not self.reformatter:
self.reformatter = VideoReformatter()
vframe = self.reformatter.reformat(
vframe,
frames_ctx.width,
frames_ctx.height,
get_video_format(
frames_ctx.sw_format, frames_ctx.width, frames_ctx.height
),
threads=self.ptr.thread_count,
)
hwframe: VideoFrame = alloc_video_frame()
err_check(lib.av_hwframe_get_buffer(self.ptr.hw_frames_ctx, hwframe.ptr, 0))
err_check(lib.av_hwframe_transfer_data(hwframe.ptr, vframe.ptr, 0))
hwframe._copy_internal_attributes(vframe, data_layout=False)
hwframe._init_user_attributes()
if hwframe.ptr.pts == lib.AV_NOPTS_VALUE:
hwframe.ptr.pts = self.ptr.frame_num
return hwframe
@cython.cfunc
def _prepare_frames_for_encode(self, input: Frame | None) -> list:
if input is None or not input:
return [None]
vframe: VideoFrame = input
# Hardware-accelerated encoding: upload the (software) frame to the device.
if self.ptr.hw_frames_ctx != cython.NULL:
return [self._encode_upload_frame(vframe)]
if (
vframe.format.pix_fmt != self.pix_fmt
or vframe.width != self.ptr.width
or vframe.height != self.ptr.height
):
if not self.reformatter:
self.reformatter = VideoReformatter()
vframe = self.reformatter.reformat(
vframe,
self.ptr.width,
self.ptr.height,
self.format,
threads=self.ptr.thread_count,
)
if vframe.ptr.pts == lib.AV_NOPTS_VALUE:
vframe.ptr.pts = self.ptr.frame_num
return [vframe]
@cython.cfunc
def _alloc_next_frame(self) -> Frame:
return alloc_video_frame()
@cython.cfunc
def _setup_decoded_frame(self, frame: Frame, packet: Packet):
CodecContext._setup_decoded_frame(self, frame, packet)
vframe: VideoFrame = frame
vframe._init_user_attributes()
@cython.cfunc
def _transfer_hwframe(self, frame: Frame):
if self.hwaccel_ctx is None:
return frame
if frame.ptr.format != self.hwaccel_ctx.config.ptr.pix_fmt:
# If we get a software frame, that means we are in software fallback mode, and don't actually
# need to transfer.
return frame
if self.hwaccel_ctx.is_hw_owned:
cython.cast(VideoFrame, frame)._device_id = self.hwaccel_ctx.device_id
return frame
frame_sw: Frame = self._alloc_next_frame()
err_check(lib.av_hwframe_transfer_data(frame_sw.ptr, frame.ptr, 0))
frame_sw._copy_internal_attributes(frame, data_layout=False)
return frame_sw
@property
def format(self):
return get_video_format(
cython.cast(lib.AVPixelFormat, self.ptr.pix_fmt),
self.ptr.width,
self.ptr.height,
)
@format.setter
def format(self, format: VideoFormat):
self._assert_not_open("format")
self.ptr.pix_fmt = format.pix_fmt
self.ptr.width = format.width
self.ptr.height = format.height
@property
def width(self):
if self.ptr is cython.NULL:
return 0
return self.ptr.width
@width.setter
def width(self, value: cython.uint):
self._assert_not_open("width")
self.ptr.width = value
@property
def height(self):
if self.ptr is cython.NULL:
return 0
return self.ptr.height
@height.setter
def height(self, value: cython.uint):
self._assert_not_open("height")
self.ptr.height = value
@property
def bits_per_coded_sample(self):
"""
The number of bits per sample in the codedwords. It's mandatory for this to be set for some formats to decode properly.
Wraps :ffmpeg:`AVCodecContext.bits_per_coded_sample`.
:type: int
"""
return self.ptr.bits_per_coded_sample
@bits_per_coded_sample.setter
def bits_per_coded_sample(self, value: cython.int):
if self.is_encoder:
raise ValueError("Not supported for encoders")
self.ptr.bits_per_coded_sample = value
@property
def pix_fmt(self):
"""
The pixel format's name.
:type: str | None
"""
desc: cython.pointer[cython.const[lib.AVPixFmtDescriptor]] = (
lib.av_pix_fmt_desc_get(cython.cast(lib.AVPixelFormat, self.ptr.pix_fmt))
)
if desc == cython.NULL:
return None
return cython.cast(str, desc.name)
@pix_fmt.setter
def pix_fmt(self, value):
self._assert_not_open("pix_fmt")
self.ptr.pix_fmt = get_pix_fmt(value)
@property
def sw_format(self):
"""
For a hardware context (e.g. ``format.name == "cuda"``), the underlying
software pixel format (``nv12``, ``p010le``, ...). ``None`` for a regular
software context.
:type: VideoFormat | None
"""
if not self.ptr.hw_frames_ctx:
if self.ptr.sw_pix_fmt != lib.AV_PIX_FMT_NONE:
return get_video_format(
cython.cast(lib.AVPixelFormat, self.ptr.sw_pix_fmt),
self.ptr.width,
self.ptr.height,
)
return None
frames_ctx: cython.pointer[lib.AVHWFramesContext] = cython.cast(
cython.pointer[lib.AVHWFramesContext], self.ptr.hw_frames_ctx.data
)
return get_video_format(frames_ctx.sw_format, self.ptr.width, self.ptr.height)
@sw_format.setter
def sw_format(self, value):
self._assert_not_open("sw_format")
self.ptr.sw_pix_fmt = get_pix_fmt(value)
@property
def framerate(self):
"""
The frame rate, in frames per second.
:type: fractions.Fraction
"""
return avrational_to_fraction(cython.address(self.ptr.framerate))
@framerate.setter
def framerate(self, value):
self._assert_not_open("framerate")
to_avrational(value, cython.address(self.ptr.framerate))
@property
def rate(self):
"""Another name for :attr:`framerate`."""
return self.framerate
@rate.setter
def rate(self, value):
self.framerate = value
@property
def gop_size(self):
"""
Sets the number of frames between keyframes. Used only for encoding.
:type: int
"""
if self.is_decoder:
raise RuntimeError("Cannot access 'gop_size' as a decoder")
return self.ptr.gop_size
@gop_size.setter
def gop_size(self, value: cython.int):
if self.is_decoder:
raise RuntimeError("Cannot access 'gop_size' as a decoder")
self.ptr.gop_size = value
@property
def sample_aspect_ratio(self):
return avrational_to_fraction(cython.address(self.ptr.sample_aspect_ratio))
@sample_aspect_ratio.setter
def sample_aspect_ratio(self, value):
to_avrational(value, cython.address(self.ptr.sample_aspect_ratio))
@property
def display_aspect_ratio(self):
dar: lib.AVRational
lib.av_reduce(
cython.address(dar.num),
cython.address(dar.den),
self.ptr.width * self.ptr.sample_aspect_ratio.num,
self.ptr.height * self.ptr.sample_aspect_ratio.den,
1024 * 1024,
)
return avrational_to_fraction(cython.address(dar))
@property
def has_b_frames(self):
"""
:type: bool
"""
return bool(self.ptr.has_b_frames)
@property
def reorder_depth(self):
"""Raw ``has_b_frames`` value from FFmpeg (int, not bool).
After :meth:`flush_buffers`, FFmpeg may reset the internal reorder
heuristic. Set this to the known reorder depth *after* seeking to
avoid dropped hierarchical B-frames.
"""
return self.ptr.has_b_frames
@reorder_depth.setter
def reorder_depth(self, value: cython.int):
self.ptr.has_b_frames = value
@property
def coded_width(self):
"""
:type: int
"""
return self.ptr.coded_width
@property
def coded_height(self):
"""
:type: int
"""
return self.ptr.coded_height
@property
def color_range(self):
"""
Describes the signal range of the colorspace.
Wraps :ffmpeg:`AVFrame.color_range`.
:type: int
"""
return self.ptr.color_range
@color_range.setter
def color_range(self, value):
self.ptr.color_range = value
@property
def color_primaries(self):
"""
Describes the RGB/XYZ matrix of the colorspace.
Wraps :ffmpeg:`AVFrame.color_primaries`.
:type: int
"""
return self.ptr.color_primaries
@color_primaries.setter
def color_primaries(self, value):
self.ptr.color_primaries = value
@property
def color_trc(self):
"""
Describes the linearization function (a.k.a. transformation characteristics) of the colorspace.
Wraps :ffmpeg:`AVFrame.color_trc`.
:type: int
"""
return self.ptr.color_trc
@color_trc.setter
def color_trc(self, value):
self.ptr.color_trc = value
@property
def colorspace(self):
"""
Describes the YUV/RGB transformation matrix of the colorspace.
Wraps :ffmpeg:`AVFrame.colorspace`.
:type: int
"""
return self.ptr.colorspace
@colorspace.setter
def colorspace(self, value):
self.ptr.colorspace = value
@property
def field_order(self):
"""The video field order as FFmpeg's raw integer value.
Wraps :ffmpeg:`AVCodecContext.field_order`.
"""
return self.ptr.field_order
@field_order.setter
def field_order(self, value: cython.int):
self.ptr.field_order = cython.cast(lib.AVFieldOrder, value)
@property
def max_b_frames(self):
"""
The maximum run of consecutive B frames when encoding a video.
:type: int
"""
return self.ptr.max_b_frames
@max_b_frames.setter
def max_b_frames(self, value):
self.ptr.max_b_frames = value
@property
def qmin(self):
"""
The minimum quantiser value of an encoded stream.
Wraps :ffmpeg:`AVCodecContext.qmin`.
:type: int
"""
return self.ptr.qmin
@qmin.setter
def qmin(self, value):
self.ptr.qmin = value
@property
def qmax(self):
"""
The maximum quantiser value of an encoded stream.
Wraps :ffmpeg:`AVCodecContext.qmax`.
:type: int
"""
return self.ptr.qmax
@qmax.setter
def qmax(self, value):
self.ptr.qmax = value
|