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66 return *bitmap || *(bitmap + 1) ||
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;
166 buf +=
frame->linesize[0];
AVPixelFormat
Pixel format.
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
ProbRange prob_ranges[XFACE_PIXELS *2]
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.
This structure describes decoded (raw) audio or video data.
@ AV_PIX_FMT_MONOWHITE
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb.
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
static int xface_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
static int pq_push(ProbRangesQueue *pq, const ProbRange *p)
static double val(void *priv, double ch)
void ff_big_add(BigInt *b, uint8_t a)
Add a to b storing the result in b.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define av_assert0(cond)
assert() equivalent, that is always enabled.
static enum AVPixelFormat pix_fmts[]
static int all_black(char *bitmap, int w, int h)
static int all_same(char *bitmap, int w, int h)
Describe the class of an AVClass context structure.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int flags
A combination of AV_PKT_FLAG values.
int set_header
set X-Face header in the output
#define i(width, name, range_min, range_max)
#define XFACE_FIRST_PRINT
const char * name
Name of the codec implementation.
int max_line_len
max line length for compressed data
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 ProbRange ff_xface_probranges_2x2[16]
static void encode_block(char *bitmap, int w, int h, int level, ProbRangesQueue *pq)
main external API structure.
const ProbRange ff_xface_probranges_per_level[4][3]
static void push_integer(BigInt *b, const ProbRange *prange)
This structure stores compressed data.
int width
picture width / height.
uint8_t bitmap[XFACE_PIXELS]
image used internally for decoding
void ff_xface_generate_face(uint8_t *dst, uint8_t *const src)
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
static int all_white(char *bitmap, int w, int h)
static void push_greys(ProbRangesQueue *pq, char *bitmap, int w, int h)
void ff_big_mul(BigInt *b, uint8_t a)
Multiply a by b storing the result in b.