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33 { 0, 0, 0, 0, 0, 0, 0, 0 },
34 { 2, 0, 0, 0, 0, 0, 0, 0 },
35 { 5, 7, 0, 0, 0, 0, 0, 0 },
36 { 5, 0, 0, 0, 0, 0, 0, 0 },
37 { 6, 0, 0, 0, 0, 0, 0, 0 },
38 { 5, 7, 5, 7, 0, 0, 0, 0 },
39 { 5, 7, 5, 0, 0, 0, 0, 0 },
40 { 5, 7, 6, 0, 0, 0, 0, 0 },
41 { 5, 5, 0, 0, 0, 0, 0, 0 },
42 { 3, 0, 0, 0, 0, 0, 0, 0 },
43 { 6, 6, 0, 0, 0, 0, 0, 0 },
44 { 2, 4, 0, 0, 0, 0, 0, 0 },
45 { 2, 4, 5, 7, 0, 0, 0, 0 },
46 { 2, 4, 5, 0, 0, 0, 0, 0 },
47 { 2, 4, 6, 0, 0, 0, 0, 0 },
48 { 2, 4, 5, 7, 5, 7, 0, 0 },
74 for (
i = 0;
i < 4;
i++)
91 "width %d and height %d must be multiplie of 4.\n",
107 for (
i = 0;
i < 4;
i++) {
120 for (
i = 0;
i < 4;
i++) {
130 for (
i = 0;
i < 4;
i++) {
131 if (
mask & (1 << 7 -
i))
133 if (
mask & (1 << 3 -
i))
142 for (
i = 0;
i < 4;
i++) {
143 if (
mask & (1 << 7 -
i))
145 if (
mask & (1 << 3 -
i))
152 const uint8_t **pend)
154 int val = bytestream2_get_be16(&
c->gb);
155 int page =
val >> 14;
156 int x = (
val & 0x7F);
157 int y = ((
val >> 7) & 0x7F);
159 *p =
c->frame[page] + x * 2 + y * 2 *
c->width;
160 *pend =
c->frame[page] +
c->frame_size;
165 uint32_t opcode_size,
offset;
167 const uint8_t *
src, *send, *opcodes;
170 i = bytestream2_get_byte(&
c->gb);
181 val = bytestream2_get_be16(&
c->gb);
183 x = (
val & 0x7F) * 2;
184 y = ((
val >> 7) & 0x7F) * 2;
185 dst =
c->frame[page] + x + y *
c->width;
186 dend =
c->frame[page] +
c->frame_size;
188 j = bytestream2_get_le16(&
c->gb) +
offset;
194 if (
dst + 3 *
c->width + 4 > dend)
204 dst =
c->frame[
c->current_frame];
205 dend =
c->frame[
c->current_frame] +
c->frame_size;
208 if ((
src + 3 *
c->width + 4 > send) ||
209 (
dst + 3 *
c->width + 4 > dend) ||
217 }
while (i < c->video_size / 16);
219 opcode_size = bytestream2_get_le16(&
c->gb);
228 dst =
c->frame[
c->current_frame];
230 for (
i = 0;
i <
c->height;
i += 4,
dst +=
c->width * 3)
231 for (j = 0; j <
c->width; j += 4,
dst += 4) {
233 if (
op > opcode_size)
236 opcode = opcodes[
op] & 15;
239 opcode = opcodes[
op] >> 4;
250 color = bytestream2_get_byte(&
c->gb);
252 mask = bytestream2_get_byte(&
c->gb);
262 mask = bytestream2_get_byte(&
c->gb);
284 code = bytestream2_get_byte(&
c->gb);
285 if ((
code & 0xF) > 4 || (
code & 0xF) == 3) {
290 if ((
code & 0xF) == 0 &&
299 c->current_frame = 0;
308 uint32_t *
out = (uint32_t *)
c->pic->data[1];
311 index = bytestream2_get_byte(&
c->gb);
312 count = bytestream2_get_byte(&
c->gb) + 1;
314 if (
index + count > 256)
320 for (
i = 0;
i < count;
i++) {
323 r = bytestream2_get_byteu(&
c->gb);
325 g = bytestream2_get_byteu(&
c->gb);
327 b = bytestream2_get_byteu(&
c->gb);
329 *
out++ = (0xFF
U << 24) | (
r << 16) | (
g << 8) |
b;
331 #if FF_API_PALETTE_HAS_CHANGED
333 c->pic->palette_has_changed = 1;
338 c->dirty[
c->current_frame] = 1;
340 for (
i = 0;
i < 4;
i++) {
342 memset(
c->frame[
i], 0,
c->frame_size);
346 switch (
code & 0x0F) {
356 dst =
c->frame[
c->current_frame];
367 frame = bytestream2_get_byte(&
c->gb);
370 if (
frame !=
c->current_frame)
371 memcpy(
c->frame[
c->current_frame],
c->frame[
frame],
c->frame_size);
375 dst =
c->frame[
c->current_frame];
376 end =
dst +
c->video_size;
387 code = bytestream2_get_byteu(&
c->gb);
390 if (
dst + count > end)
393 memset(
dst, bytestream2_get_byteu(&
c->gb), count);
404 c->frame[
c->current_frame],
c->width,
405 c->width,
c->height);
407 c->current_frame = (
c->current_frame + 1) & 3;
417 .
p.
name =
"paf_video",
#define FF_ENABLE_DEPRECATION_WARNINGS
static int paf_video_decode(AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *pkt)
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
static av_always_inline void bytestream2_skipu(GetByteContext *g, unsigned int size)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
This structure describes decoded (raw) audio or video data.
void av_image_copy_plane(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int bytewidth, int height)
Copy image plane from src to dst.
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
AVCodec p
The public AVCodec.
static double val(void *priv, double ch)
static void copy_src_mask(uint8_t *dst, int width, uint8_t mask, const uint8_t *src)
int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of a plane of an image with...
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
#define FF_CODEC_DECODE_CB(func)
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
#define av_assert0(cond)
assert() equivalent, that is always enabled.
static av_cold int paf_video_init(AVCodecContext *avctx)
int64_t max_pixels
The number of pixels per image to maximally accept.
#define CODEC_LONG_NAME(str)
static void copy_color_mask(uint8_t *dst, int width, uint8_t mask, uint8_t color)
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
static const uint8_t block_sequences[16][8]
@ AV_PICTURE_TYPE_I
Intra.
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
static void read4x4block(PAFVideoDecContext *c, uint8_t *dst, int width)
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
static av_always_inline int bytestream2_tell(GetByteContext *g)
int(* init)(AVBSFContext *ctx)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
static const uint8_t *BS_FUNC() align(BSCTX *bc)
Skip bits to a byte boundary.
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
static void copy_block4(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)
#define i(width, name, range_min, range_max)
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
const char * name
Name of the codec implementation.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
static void set_src_position(PAFVideoDecContext *c, const uint8_t **p, const uint8_t **pend)
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
const FFCodec ff_paf_video_decoder
main external API structure.
int discard_damaged_percentage
The percentage of damaged samples to discard a frame.
#define FF_DISABLE_DEPRECATION_WARNINGS
@ AV_PICTURE_TYPE_P
Predicted.
static av_always_inline unsigned int bytestream2_get_bufferu(GetByteContext *g, uint8_t *dst, unsigned int size)
#define avpriv_request_sample(...)
This structure stores compressed data.
int width
picture width / height.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
static av_cold int paf_video_close(AVCodecContext *avctx)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
static int decode_0(PAFVideoDecContext *c, const uint8_t *pkt, uint8_t code)