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43 #define DECOMP_BUF_PADDING 16
48 static const uint8_t
shift1[6] = { 0, 8, 8, 8, 4, 4 };
49 static const uint8_t
shift2[6] = { 0, 0, 8, 4, 0, 4 };
55 uint8_t *src_end =
src + srcsize;
57 int type, x, y,
d, d2;
68 for(j = 0; j < avctx->
height; j += 4){
69 for(
i = 0;
i < avctx->
width;
i += 4){
70 if (
data > src_end ||
mv > src_end || msk > src_end)
77 x = (*mv) >> 4;
if(x & 8) x = 8 - x;
78 y = (*
mv++) & 0xF;
if(y & 8) y = 8 - y;
79 if (i < -x || avctx->
width -
i - 4 < x ||
80 j < -y || avctx->
height - j - 4 < y) {
87 for(y = 0; y < 4; y++){
108 for(y = 0; y < 4; y++){
109 for(x = 0; x < 4; x++){
118 for(y = 0; y < 4; y++){
125 for(y = 0; y < 4; y++){
133 for(k = 0; k < 4; k++){
134 d = ((k & 1) << 1) + ((k & 2) *
stride);
135 d2 = ((k & 1) << 1) + ((k & 2) *
stride);
139 x = (*mv) >> 4;
if(x & 8) x = 8 - x;
140 y = (*
mv++) & 0xF;
if(y & 8) y = 8 - y;
141 if (
i + 2*(k & 1) < -x || avctx->
width -
i - 2*(k & 1) - 2 < x ||
142 j + (k & 2) < -y || avctx->
height - j - (k & 2) - 2 < y) {
148 tmp[
d + 0 ] = tmp2[0];
149 tmp[
d + 1 ] = tmp2[1];
173 for(y = 0; y < 4; y++){
174 for(x = 0; x < 4; x++){
187 for(y = 0; y < 4; y++){
188 for(x = 0; x < 4; x++){
212 uint8_t *outptr, *srcptr, *tmpptr;
214 int i, j, compr,
ret;
222 if (bytestream2_peek_le32(&gb) ==
MKTAG(
'C',
'M',
'A',
'P')) {
224 for(
i = 0;
i < 256;
i++){
225 c->pal[
i] = 0xFF
U << 24 | bytestream2_get_be24(&gb);
233 #if FF_API_PALETTE_HAS_CHANGED
240 srcptr =
c->decomp_buf;
241 tmpptr =
c->prev->data[0];
244 if (bytestream2_get_le32(&gb) ==
MKTAG(
'N',
'U',
'L',
'L'))
247 compr = bytestream2_get_byte(&gb);
250 if (compr != 4 && compr != -1) {
267 if (
c->prev->data[0])
279 for (j = 0; j < avctx->
height; j++) {
280 memcpy(outptr, srcptr, avctx->
width);
282 srcptr += avctx->
width;
294 for (j = 0; j < avctx->
height; j++) {
297 outptr[
i] = srcptr[
i] ^ tmpptr[
i];
300 memcpy(outptr, srcptr, avctx->
width);
302 srcptr += avctx->
width;
309 if (!
c->prev->data[0]) {
346 if (!
c->decomp_buf) {
#define FF_ENABLE_DEPRECATION_WARNINGS
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
attribute_deprecated int palette_has_changed
Tell user application that palette has changed from previous frame.
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 const int8_t mv[256][2]
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.
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
const FFCodec ff_dxa_decoder
#define FF_DEBUG_PICT_INFO
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
AVCodec p
The public AVCodec.
static av_cold int decode_end(AVCodecContext *avctx)
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 type
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.
static const uint16_t mask[17]
#define FF_CODEC_DECODE_CB(func)
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
int(* init)(AVBSFContext *ctx)
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
#define DECOMP_BUF_PADDING
#define CODEC_LONG_NAME(str)
@ AV_PICTURE_TYPE_I
Intra.
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 flags2
AV_CODEC_FLAG2_*.
enum AVPictureType pict_type
Picture type of the frame.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t *dst, int stride, uint8_t *src, int srcsize, uint8_t *ref)
#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
#define AV_CODEC_FLAG2_SHOW_ALL
Show all frames before the first keyframe.
static const uint8_t shift2[6]
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
static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
int av_frame_replace(AVFrame *dst, const AVFrame *src)
Ensure the destination frame refers to the same data described by the source frame,...
main external API structure.
static int ref[MAX_W *MAX_W]
#define FF_DISABLE_DEPRECATION_WARNINGS
@ AV_PICTURE_TYPE_P
Predicted.
#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)
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define MKTAG(a, b, c, d)
static const uint8_t shift1[6]
static av_cold int decode_init(AVCodecContext *avctx)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16