41 int transparent,
interlaced = 1, skip, opaque_length,
i, j, k;
44 while (extradata_size >= 24) {
45 uint32_t atom_size =
AV_RB32(extradata);
46 if (!memcmp(&extradata[4],
"APRGAPRG0001", 12)) {
47 interlaced = extradata[19] != 1;
50 if (atom_size && atom_size <= extradata_size) {
51 extradata += atom_size;
52 extradata_size -= atom_size;
57 if (avctx->
height == 486) {
62 opaque_length = 2 * avctx->
width * (avctx->
height + skip) + 4 * interlaced;
63 if (avpkt->
size < opaque_length) {
68 avpkt->
size >= opaque_length * 2 + 4;
69 srca = src + opaque_length + 5;
78 src += avctx->
width * skip;
79 srca += avctx->
width * skip;
82 for (i = 0; i < interlaced + 1; i++) {
83 src += avctx->
width * skip;
84 srca += avctx->
width * skip;
85 if (interlaced && avctx->
height == 486) {
98 for (k = 0; k < avctx->
width >> 1; k++) {
101 a[2 * k ] = 0xFF - (transparent ? *srca++ : 0);
104 y[2 * k + 1] = *src++;
105 a[2 * k + 1] = 0xFF - (transparent ? *srca++ : 0);
109 y += (interlaced + 1) * pic->
linesize[0];
110 u += (interlaced + 1) * pic->
linesize[1];
111 v += (interlaced + 1) * pic->
linesize[2];
112 a += (interlaced + 1) * pic->
linesize[3];
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
#define u(width, name, range_min, range_max)
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
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
const char * name
Name of the codec implementation.
static int avui_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
enum AVPictureType pict_type
Picture type of the frame.
int width
picture width / height.
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
main external API structure.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
common internal api header.
int key_frame
1 -> keyframe, 0-> not
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
This structure stores compressed data.
static av_cold int avui_decode_init(AVCodecContext *avctx)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.