64 if (avctx->
width & 1) {
73 s->scratch_buffer =
av_malloc(
s->buffer_size + 130);
74 if (!
s->scratch_buffer)
85 uint8_t *dst,
const int dst_size)
90 const uint8_t *dst_end = dst + dst_size;
94 tree_size = bytestream2_get_byte(&
s->gb);
95 eof = bytestream2_get_byte(&
s->gb);
96 tree_root = eof + tree_size;
100 bits = bytestream2_get_byte(&
s->gb);
106 node = bytestream2_get_byte(&tree);
118 bits = bytestream2_get_byteu(&
s->gb);
127 uint8_t *dest,
const int dest_len)
132 const uint8_t *dest_end = dest + dest_len;
134 while (dest < dest_end) {
138 opcode = bytestream2_get_byteu(&
s->gb);
142 if ((opcode & 0x80) == 0) {
144 back = ((opcode & 0x60) << 3) + bytestream2_get_byte(&
s->gb) + 1;
145 size2 = ((opcode & 0x1c) >> 2) + 3;
146 }
else if ((opcode & 0x40) == 0) {
147 size = bytestream2_peek_byte(&
s->gb) >> 6;
148 back = (bytestream2_get_be16(&
s->gb) & 0x3fff) + 1;
149 size2 = (opcode & 0x3f) + 4;
152 back = ((opcode & 0x10) << 12) + bytestream2_get_be16(&
s->gb) + 1;
153 size2 = ((opcode & 0x0c) << 6) + bytestream2_get_byte(&
s->gb) + 5;
154 if (
size + size2 > dest_end - dest)
157 if (dest +
size + size2 > dest_end ||
158 dest - orig_dest +
size < back)
165 int finish = opcode >= 0xfc;
167 size =
finish ? opcode & 3 : ((opcode & 0x1f) << 2) + 4;
168 if (dest_end - dest <
size)
176 return dest - orig_dest;
196 mode = bytestream2_get_le16(&
s->gb);
198 table_size = bytestream2_get_le16(&
s->gb);
208 memset(
s->scratch_buffer, 0,
s->buffer_size);
217 src =
s->scratch_buffer;
218 src_end =
src + dec_size;
220 for (j = 0; j < avctx->
height >> 1; j++) {
221 for (
i = 0;
i < avctx->
width >> 1;
i++) {
222 if (src_end -
src < 1)
226 if (
val >= table_size)
229 uval = (
val >> 3) & 0xF8;
230 vval = (
val >> 8) & 0xF8;
231 U[
i] = uval | (uval >> 5);
232 V[
i] = vval | (vval >> 5);
235 U +=
s->pic->linesize[1];
236 V +=
s->pic->linesize[2];
239 memcpy(
U,
U -
s->pic->linesize[1], avctx->
width >> 1);
240 memcpy(
V,
V -
s->pic->linesize[2], avctx->
width >> 1);
246 for (j = 0; j < avctx->
height >> 2; j++) {
247 for (
i = 0;
i < avctx->
width >> 1;
i += 2) {
248 if (src_end -
src < 1)
252 if (
val >= table_size)
255 uval = (
val >> 3) & 0xF8;
256 vval = (
val >> 8) & 0xF8;
257 U[
i] =
U[
i+1] = U2[
i] = U2[
i+1] = uval | (uval >> 5);
258 V[
i] =
V[
i+1] = V2[
i] = V2[
i+1] = vval | (vval >> 5);
261 U +=
s->pic->linesize[1] * 2;
262 V +=
s->pic->linesize[2] * 2;
263 U2 +=
s->pic->linesize[1] * 2;
264 V2 +=
s->pic->linesize[2] * 2;
267 int lines = ((avctx->
height + 1) >> 1) - (avctx->
height >> 2) * 2;
269 memcpy(
U,
U - lines *
s->pic->linesize[1], lines *
s->pic->linesize[1]);
270 memcpy(
V,
V - lines *
s->pic->linesize[2], lines *
s->pic->linesize[2]);
280 uint8_t *ybuf, *prev_buf, *
src =
s->scratch_buffer;
281 unsigned chroma_off, corr_off;
286 chroma_off = bytestream2_get_le32(&
s->gb);
287 corr_off = bytestream2_get_le32(&
s->gb);
306 for (j = 1; j < avctx->
width - 1; j += 2) {
307 cur = (last + *
src++) & 0x1F;
308 ybuf[j] = last + cur;
309 ybuf[j+1] = cur << 1;
314 ybuf += avctx->
width;
317 last = ((prev_buf[0] >> 1) + *
src++) & 0x1F;
319 for (j = 1; j < avctx->
width - 1; j += 2) {
320 cur = ((prev_buf[j + 1] >> 1) + *
src++) & 0x1F;
321 ybuf[j] = last + cur;
322 ybuf[j+1] = cur << 1;
327 ybuf += avctx->
width;
334 dec_size =
xan_unpack(
s,
s->scratch_buffer,
s->buffer_size / 2);
338 dec_size =
FFMIN(dec_size,
s->buffer_size/2 - 1);
340 for (
i = 0;
i < dec_size;
i++)
341 s->y_buffer[
i*2+1] = (
s->y_buffer[
i*2+1] + (
s->scratch_buffer[
i] << 1)) & 0x3F;
345 ybuf =
s->pic->data[0];
346 for (j = 0; j < avctx->
height; j++) {
350 ybuf +=
s->pic->linesize[0];
369 s->buffer_size >> 1);
377 last = (ybuf[0] + (*
src++ << 1)) & 0x3F;
379 for (j = 1; j < avctx->
width - 1; j += 2) {
380 cur = (ybuf[j + 1] + (*
src++ << 1)) & 0x3F;
381 ybuf[j] = (last + cur) >> 1;
386 ybuf += avctx->
width;
390 ybuf =
s->pic->data[0];
391 for (j = 0; j < avctx->
height; j++) {
395 ybuf +=
s->pic->linesize[0];
402 void *
data,
int *got_frame,
413 ftype = bytestream2_get_le32(&
s->gb);
static double val(void *priv, double ch)
Libavcodec external API header.
static av_cold int init(AVCodecContext *avctx)
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
static av_always_inline int bytestream2_size(GetByteContext *g)
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
static av_always_inline int bytestream2_tell(GetByteContext *g)
#define bit(string, value)
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
mode
Use these values in ebur128_init (or'ed).
#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.
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
#define AV_LOG_WARNING
Something somehow does not look correct.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
Overlapping memcpy() implementation.
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static const uint16_t mask[17]
Memory handling functions.
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
static const uint16_t table[]
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.
This structure stores compressed data.
static const uint8_t offset[127][2]
static int xan_decode_frame_type1(AVCodecContext *avctx)
static av_cold int xan_decode_init(AVCodecContext *avctx)
static int xan_unpack_luma(XanContext *s, uint8_t *dst, const int dst_size)
static int xan_unpack(XanContext *s, uint8_t *dest, const int dest_len)
static int xan_decode_chroma(AVCodecContext *avctx, unsigned chroma_off)
AVCodec ff_xan_wc4_decoder
static av_cold int xan_decode_end(AVCodecContext *avctx)
static int xan_decode_frame_type0(AVCodecContext *avctx)
static int xan_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)