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61 if (
w & 1) bitmap[0] = 1;
62 if (
w & 2) bitmap[1] = 1;
97 "Size value %dx%d not supported, only accepts a size of %dx%d\n",
123 for (
i = 0, k = 0;
i < avpkt->
size && avpkt->
data[
i];
i++) {
132 "Buffer is longer than expected, truncating at byte %d\n",
i);
#define AV_LOG_WARNING
Something somehow does not look correct.
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
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.
const FFCodec ff_xface_decoder
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.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static void pop_greys(BigInt *b, char *bitmap, int w, int h)
AVCodec p
The public AVCodec.
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 FF_CODEC_DECODE_CB(func)
int(* init)(AVBSFContext *ctx)
#define CODEC_LONG_NAME(str)
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
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_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_WB16 unsigned int_TMPL byte
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
#define i(width, name, range_min, range_max)
#define XFACE_FIRST_PRINT
const char * name
Name of the codec implementation.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
const ProbRange ff_xface_probranges_2x2[16]
main external API structure.
const ProbRange ff_xface_probranges_per_level[4][3]
This structure stores compressed data.
int width
picture width / height.
static void decode_block(BigInt *b, char *bitmap, int w, int h, int level)
uint8_t bitmap[XFACE_PIXELS]
image used internally for decoding
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
void ff_xface_generate_face(uint8_t *dst, uint8_t *const src)
static av_cold int xface_decode_init(AVCodecContext *avctx)
static int xface_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
static int pop_integer(BigInt *b, const ProbRange *pranges)
void ff_big_mul(BigInt *b, uint8_t a)
Multiply a by b storing the result in b.