66 return *bitmap || *(bitmap + 1) ||
73 return *bitmap == 0 &&
all_same(bitmap, w, h);
123 encode_block(bitmap + w + h * XFACE_WIDTH, w, h, level, pq);
143 int i, j, k,
ret = 0;
151 "Size value %dx%d not supported, only accepts a size of %dx%d\n",
160 buf = frame->
data[0];
163 for (k = 0; k < 8; k++)
164 xface->
bitmap[i++] = (buf[j]>>(7-k))&1;
static int all_white(char *bitmap, int w, int h)
static int all_same(char *bitmap, int w, int h)
This structure describes decoded (raw) audio or video data.
int max_line_len
max line length for compressed data
const ProbRange ff_xface_probranges_per_level[4][3]
X-Face common definitions.
static void encode_block(char *bitmap, int w, int h, int level, ProbRangesQueue *pq)
void ff_xface_generate_face(uint8_t *dst, uint8_t *const src)
#define av_assert0(cond)
assert() equivalent, that is always enabled.
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
static int xface_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
void ff_big_mul(BigInt *b, uint8_t a)
Multiply a by b storing the result in b.
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
static int all_black(char *bitmap, int w, int h)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static void push_greys(ProbRangesQueue *pq, char *bitmap, int w, int h)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
void ff_big_add(BigInt *b, uint8_t a)
Add a to b storing the result in b.
simple assert() macros that are a bit more flexible than ISO C assert().
const ProbRange ff_xface_probranges_2x2[16]
const char * name
Name of the codec implementation.
int flags
A combination of AV_PKT_FLAG values.
static void push_integer(BigInt *b, const ProbRange *prange)
int width
picture width / height.
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
void ff_big_div(BigInt *b, uint8_t a, uint8_t *r)
Divide b by a storing the result in b and the remainder in the word pointed to by r...
uint8_t bitmap[XFACE_PIXELS]
image used internally for decoding
#define XFACE_FIRST_PRINT
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
main external API structure.
Describe the class of an AVClass context structure.
static enum AVPixelFormat pix_fmts[]
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
ProbRange prob_ranges[XFACE_PIXELS *2]
common internal api header.
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb...
static int pq_push(ProbRangesQueue *pq, const ProbRange *p)
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
int set_header
set X-Face header in the output
AVPixelFormat
Pixel format.
static double val(void *priv, double ch)
This structure stores compressed data.