55 const uint8_t *bytestream_end = bytestream + avpkt->
size;
68 for (
i = 0;
i < 16;
i++) {
69 a->delta[
i] = *bytestream++;
73 for (y = 0; y < avctx->
height; y++) {
83 for (
i = 0;
i < 4;
i++)
84 a->offset[
i] = *bytestream++;
86 offset =
a->offset[0] -
a->delta[bytestream[2] & 0xF];
87 for (x = 0; x < avctx->
width; x += 4) {
88 luma[0] =
offset +=
a->delta[bytestream[2] & 0xF];
89 luma[1] =
offset +=
a->delta[bytestream[2] >> 4];
90 luma[2] =
offset +=
a->delta[bytestream[0] & 0xF];
91 luma[3] =
offset +=
a->delta[bytestream[0] >> 4];
94 *
cb++ = bytestream[3];
95 *
cr++ = bytestream[1];
102 offset =
a->offset[y & 3] -
a->delta[bytestream[2] & 0xF];
104 for (x = 0; x < avctx->
width; x += 8) {
105 luma[0] =
offset +=
a->delta[bytestream[2] & 0xF];
106 luma[1] =
offset +=
a->delta[bytestream[2] >> 4];
107 luma[2] =
offset +=
a->delta[bytestream[3] & 0xF];
108 luma[3] =
offset +=
a->delta[bytestream[3] >> 4];
109 luma[4] =
offset +=
a->delta[bytestream[0] & 0xF];
110 luma[5] =
offset +=
a->delta[bytestream[0] >> 4];
111 luma[6] =
offset +=
a->delta[bytestream[1] & 0xF];
112 luma[7] =
offset +=
a->delta[bytestream[1] >> 4];
121 return bytestream - avpkt->
data;
simple assert() macros that are a bit more flexible than ISO C assert().
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Libavcodec external API header.
static av_cold int init(AVCodecContext *avctx)
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
@ AV_PICTURE_TYPE_I
Intra.
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
main external API structure.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
int width
picture width / height.
const char * name
Name of the codec implementation.
This structure describes decoded (raw) audio or video data.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
int key_frame
1 -> keyframe, 0-> not
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
enum AVPictureType pict_type
Picture type of the frame.
This structure stores compressed data.
#define avpriv_request_sample(...)
static int vcr1_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static av_cold int vcr1_decode_init(AVCodecContext *avctx)
static double cr(void *priv, double x, double y)
static double cb(void *priv, double x, double y)
static const uint8_t offset[127][2]