33 #define UNCHECKED_BITSTREAM_READER 1 44 #define classic_shift_luma_table_size 42 46 34, 36, 35, 69, 135, 232, 9, 16, 10, 24, 11, 23, 12, 16, 13, 10,
47 14, 8, 15, 8, 16, 8, 17, 20, 16, 10, 207, 206, 205, 236, 11, 8,
48 10, 21, 9, 23, 8, 8, 199, 70, 69, 68, 0,
52 #define classic_shift_chroma_table_size 59 54 66, 36, 37, 38, 39, 40, 41, 75, 76, 77, 110, 239, 144, 81, 82, 83,
55 84, 85, 118, 183, 56, 57, 88, 89, 56, 89, 154, 57, 58, 57, 26, 141,
56 57, 56, 58, 57, 58, 57, 184, 119, 214, 245, 116, 83, 82, 49, 80, 79,
57 78, 77, 44, 75, 41, 40, 39, 38, 37, 36, 34, 0,
62 3, 9, 5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,
63 73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,
64 68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,
65 35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,
66 37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,
67 35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,
68 27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,
69 15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,
70 12, 17, 19, 13, 4, 9, 2, 11, 1, 7, 8, 0, 16, 3, 14, 6,
71 12, 10, 5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,
72 18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,
73 28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,
74 28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,
75 62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,
76 54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,
77 46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13, 7, 8,
81 3, 1, 2, 2, 2, 2, 3, 3, 7, 5, 7, 5, 8, 6, 11, 9,
82 7, 13, 11, 10, 9, 8, 7, 5, 9, 7, 6, 4, 7, 5, 8, 7,
83 11, 8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,
84 43, 45, 76, 81, 46, 82, 75, 55, 56, 144, 58, 80, 60, 74, 147, 63,
85 143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
86 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,
87 17, 14, 5, 6, 100, 54, 47, 50, 51, 53, 106, 107, 108, 109, 110, 111,
88 112, 113, 114, 115, 4, 117, 118, 92, 94, 121, 122, 3, 124, 103, 2, 1,
89 0, 129, 130, 131, 120, 119, 126, 125, 136, 137, 138, 139, 140, 141, 142, 134,
90 135, 132, 133, 104, 64, 101, 62, 57, 102, 95, 93, 59, 61, 28, 97, 96,
91 52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,
92 19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10, 9, 8, 36,
93 7, 128, 127, 105, 123, 116, 35, 34, 33, 145, 31, 79, 42, 146, 78, 26,
94 83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,
95 14, 16, 17, 18, 20, 21, 12, 14, 15, 9, 10, 6, 9, 6, 5, 8,
96 6, 12, 8, 10, 7, 9, 6, 4, 6, 2, 2, 3, 3, 3, 3, 2,
103 for (i = 0; i < n;) {
131 for (p = 0; p < 4; p++) {
132 int p0 = s->
version > 2 ? p : 0;
133 for (i = y = 0; y < s->
vlc_n; y++) {
134 int len0 = s->
len[p0][y];
136 if (limit <= 0 || !len0)
140 for (u = 0; u < s->
vlc_n; u++) {
141 int len1 = s->
len[p][
u];
142 if (len1 > limit || !len1)
147 len[
i] = len0 + len1;
148 bits[
i] = (s->
bits[p0][y] << len1) + s->
bits[p][u];
149 symbols[i] = (y << 8) + (u & 0xFF);
155 bits, 2, 2, symbols, 2, 2, 0)) < 0)
166 for (i = 0,
g = -16;
g < 16;
g++) {
167 int len0 = s->
len[p0][
g & 255];
169 if (limit0 < 2 || !len0)
171 for (
b = -16;
b < 16;
b++) {
172 int len1 = s->
len[p1][
b & 255];
173 int limit1 = limit0 - len1;
174 if (limit1 < 1 || !len1)
177 for (
r = -16;
r < 16;
r++) {
178 int len2 = s->
len[2][
r & 255];
179 if (len2 > limit1 || !len2)
182 len[
i] = len0 + len1 + len2;
183 bits[
i] = (
code << len2) + s->
bits[2][
r & 255];
220 for (i = 0; i <
count; i++) {
227 s->
bits[i], 4, 4, 0)) < 0)
252 for (i = 0; i < 256; i++)
254 for (i = 0; i < 256; i++)
258 memcpy(s->
bits[1], s->
bits[0], 256 *
sizeof(uint32_t));
261 memcpy(s->
bits[2], s->
bits[1], 256 *
sizeof(uint32_t));
264 for (i = 0; i < 4; i++) {
267 s->
bits[i], 4, 4, 0)) < 0)
285 for (i = 0; i < 8; i++)
302 memset(s->
vlc, 0, 4 *
sizeof(
VLC));
323 int method, interlace;
345 interlace = (avctx->
extradata[2] & 0x30) >> 4;
557 "for this combination of colorspace and predictor type.\n");
574 #define VLC_INTERN(dst, table, gb, name, bits, max_depth) \ 575 code = table[index][0]; \ 576 n = table[index][1]; \ 577 if (max_depth > 1 && n < 0) { \ 578 LAST_SKIP_BITS(name, gb, bits); \ 579 UPDATE_CACHE(name, gb); \ 582 index = SHOW_UBITS(name, gb, nb_bits) + code; \ 583 code = table[index][0]; \ 584 n = table[index][1]; \ 585 if (max_depth > 2 && n < 0) { \ 586 LAST_SKIP_BITS(name, gb, nb_bits); \ 587 UPDATE_CACHE(name, gb); \ 590 index = SHOW_UBITS(name, gb, nb_bits) + code; \ 591 code = table[index][0]; \ 592 n = table[index][1]; \ 596 LAST_SKIP_BITS(name, gb, n) 599 #define GET_VLC_DUAL(dst0, dst1, name, gb, dtable, table1, table2, \ 600 bits, max_depth, OP) \ 602 unsigned int index = SHOW_UBITS(name, gb, bits); \ 603 int code, n = dtable[index][1]; \ 607 VLC_INTERN(dst0, table1, gb, name, bits, max_depth); \ 609 UPDATE_CACHE(re, gb); \ 610 index = SHOW_UBITS(name, gb, bits); \ 611 VLC_INTERN(dst1, table2, gb, name, bits, max_depth); \ 613 code = dtable[index][0]; \ 614 OP(dst0, dst1, code); \ 615 LAST_SKIP_BITS(name, gb, n); \ 619 #define OP8bits(dst0, dst1, code) dst0 = code>>8; dst1 = code 621 #define READ_2PIX(dst0, dst1, plane1) \ 622 UPDATE_CACHE(re, &s->gb); \ 623 GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane1].table, \ 624 s->vlc[0].table, s->vlc[plane1].table, VLC_BITS, 3, OP8bits) 633 if (count >= icount) {
634 for (i = 0; i < icount; i++) {
643 for (; i <
count; i++)
644 s->
temp[0][2 * i ] = s->
temp[1][i] =
645 s->
temp[0][2 * i + 1] = s->
temp[2][i] = 0;
647 for (i = 0; i <
count; i++) {
655 #define READ_2PIX_PLANE(dst0, dst1, plane, OP) \ 656 UPDATE_CACHE(re, &s->gb); \ 657 GET_VLC_DUAL(dst0, dst1, re, &s->gb, s->vlc[4+plane].table, \ 658 s->vlc[plane].table, s->vlc[plane].table, VLC_BITS, 3, OP) 660 #define OP14bits(dst0, dst1, code) dst0 = code>>8; dst1 = sign_extend(code, 8) 664 #define READ_2PIX_PLANE16(dst0, dst1, plane){\ 665 dst0 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\ 666 dst0 += get_bits(&s->gb, 2);\ 667 dst1 = get_vlc2(&s->gb, s->vlc[plane].table, VLC_BITS, 3)<<2;\ 668 dst1 += get_bits(&s->gb, 2);\ 681 for(i=0; i<
count; i++){
687 int nb_bits,
code, n;
694 }
else if (s->
bps <= 14) {
701 for(i=0; i<
count; i++){
707 int nb_bits,
code, n;
720 for(i=0; i<
count; i++){
742 for (i = 0; i <
count; i++) {
757 int code, n, nb_bits;
775 s->
temp[0][4 * i +
B] = code + s->
temp[0][4 * i +
G];
780 s->
temp[0][4 * i +
R] = code + s->
temp[0][4 * i +
G];
802 s->
temp[0][4 * i +
A] = 0;
839 offset[1] = frame->
linesize[1] * cy;
840 offset[2] = frame->
linesize[2] * cy;
864 s->
hdsp.
add_int16((uint16_t*)dst, (
const uint16_t*)src, s->
n - 1, w);
878 int buf_size,
int y_offset,
int table_size)
881 int fake_ystride, fake_ustride, fake_vstride;
883 const int width2 = s->
width >> 1;
895 for(plane = 0; plane < 1 + 2*s->
chroma + s->
alpha; plane++) {
896 int left, lefttop, y;
899 int fake_stride = fake_ystride;
901 if (s->
chroma && (plane == 1 || plane == 2)) {
904 fake_stride = plane == 1 ? fake_ustride : fake_vstride;
913 for (y = 1; y <
h; y++) {
943 lefttop = p->
data[plane][0];
964 int lefty, leftu, leftv;
965 int lefttopy, lefttopu, lefttopv;
974 "YUY2 output is not implemented yet\n");
996 for (cy = y = 1; y <
height; y++, cy++) {
1059 s->
temp[0], width, lefty);
1073 s->
temp[0], 4, lefty);
1080 lefttopy = p->
data[0][3];
1084 width - 4, &lefty, &lefttopy);
1086 lefttopu = p->
data[1][1];
1087 lefttopv = p->
data[2][1];
1094 for (; y <
height; y++, cy++) {
1098 while (2 * cy > y) {
1133 const int last_line = (y_offset + height - 1) * p->
linesize[0];
1144 left[
A] = p->
data[0][last_line +
A] = 255;
1154 s->
temp[0], width - 1, left);
1156 for (y = height - 2; y >= 0; y--) {
1160 s->
temp[0], width, left);
1167 fake_ystride, 4 * width);
1176 "prediction type not supported!\n");
1180 "BGR24 output is not implemented yet\n");
1192 int buf_size = avpkt->
size;
1198 int slice, table_size = 0,
ret, nb_slices;
1199 unsigned slices_info_offset;
1202 if (buf_size < (width * height + 7)/8)
1212 (
const uint32_t *) buf, buf_size / 4);
1223 if ((
unsigned) (buf_size - table_size) >= INT_MAX / 8)
1229 (buf_size > 32 &&
AV_RL32(avpkt->
data + buf_size - 16) == 0)) {
1230 slices_info_offset =
AV_RL32(avpkt->
data + buf_size - 4);
1231 slice_height =
AV_RL32(avpkt->
data + buf_size - 8);
1233 if (nb_slices * 8LL + slices_info_offset > buf_size - 16 ||
1235 slice_height <= 0 || nb_slices * (uint64_t)slice_height > height)
1242 for (slice = 0; slice < nb_slices; slice++) {
1243 int y_offset, slice_offset, slice_size;
1245 if (nb_slices > 1) {
1246 slice_offset =
AV_RL32(avpkt->
data + slices_info_offset + slice * 8);
1247 slice_size =
AV_RL32(avpkt->
data + slices_info_offset + slice * 8 + 4);
1249 if (slice_offset < 0 || slice_size <= 0 || (slice_offset&3) ||
1250 slice_offset + (int64_t)slice_size > buf_size)
1253 y_offset = height - (slice + 1) * slice_height;
1255 (
const uint32_t *)(buf + slice_offset), slice_size / 4);
1259 slice_size = buf_size;
1262 ret =
decode_slice(avctx, p, slice_height, slice_size, y_offset, table_size);
1286 #if CONFIG_FFVHUFF_DECODER 1301 #if CONFIG_HYMT_DECODER static void add_median_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, const uint8_t *diff, int w, int *left, int *left_top)
#define OP14bits(dst0, dst1, code)
#define AV_PIX_FMT_YUVA422P16
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
int(* add_left_pred)(uint8_t *dst, const uint8_t *src, ptrdiff_t w, int left)
#define AV_NUM_DATA_POINTERS
static void decode_plane_bitstream(HYuvContext *s, int width, int plane)
#define AV_PIX_FMT_YUVA422P9
#define READ_2PIX_PLANE(dst0, dst1, plane, OP)
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
#define AV_PIX_FMT_YUVA420P10
#define AV_PIX_FMT_YUV444P14
#define AV_PIX_FMT_YUVA422P10
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
static av_cold int init(AVCodecContext *avctx)
static void decode_422_bitstream(HYuvContext *s, int count)
int ff_init_vlc_sparse(VLC *vlc_arg, int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, const void *symbols, int symbols_wrap, int symbols_size, int flags)
#define AV_PIX_FMT_GBRP10
static av_always_inline void decode_bgr_1(HYuvContext *s, int count, int decorrelate, int alpha)
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
#define AV_PIX_FMT_YUV420P12
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
#define READ_2PIX_PLANE16(dst0, dst1, plane)
unsigned int bitstream_buffer_size
static void error(const char *err)
static int generate_joint_tables(HYuvContext *s)
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
void(* draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height)
If non NULL, 'draw_horiz_band' is called by the libavcodec decoder to draw a horizontal band...
#define READ_2PIX(dst0, dst1, plane1)
static int read_old_huffman_tables(HYuvContext *s)
static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
void(* add_int16)(uint16_t *dst, const uint16_t *src, unsigned mask, int w)
#define av_assert0(cond)
assert() equivalent, that is always enabled.
uint32_t pix_bgr_map[1<< VLC_BITS]
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
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
static void decode_bgr_bitstream(HYuvContext *s, int count)
Multithreading support functions.
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
#define u(width, name, range_min, range_max)
#define AV_PIX_FMT_YUVA420P9
static int get_bits_count(const GetBitContext *s)
void(* add_median_pred)(uint8_t *dst, const uint8_t *top, const uint8_t *diff, ptrdiff_t w, int *left, int *left_top)
bitstream reader API header.
#define AV_PIX_FMT_YUV444P16
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
#define AV_PIX_FMT_YUV422P12
#define AV_PIX_FMT_YUVA420P16
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
uint16_t * temp16[3]
identical to temp but 16bit type
uint8_t len[4][MAX_VLC_N]
av_cold int ff_huffyuv_alloc_temp(HYuvContext *s)
static int get_bits_left(GetBitContext *gb)
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
#define UPDATE_CACHE(name, gb)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
av_cold void ff_huffyuv_common_end(HYuvContext *s)
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
static const unsigned char classic_add_luma[256]
uint8_t * bitstream_buffer
int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
#define AV_PIX_FMT_YUVA444P16
const char * name
Name of the codec implementation.
#define AV_PIX_FMT_YUV444P10
#define CLOSE_READER(name, gb)
huffyuv codec for libavcodec.
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
#define classic_shift_chroma_table_size
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call have so the codec calls ff_thread_report set FF_CODEC_CAP_ALLOCATE_PROGRESS in AVCodec caps_internal and use ff_thread_get_buffer() to allocate frames.The frames must then be freed with ff_thread_release_buffer().Otherwise decode directly into the user-supplied frames.Call ff_thread_report_progress() after some part of the current picture has decoded.A good place to put this is where draw_horiz_band() is called-add this if it isn't called anywhere
#define AV_PIX_FMT_YUV422P9
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
#define AV_CODEC_CAP_DRAW_HORIZ_BAND
Decoder can use draw_horiz_band callback.
#define AV_PIX_FMT_GBRP16
#define AV_PIX_FMT_GRAY16
#define VLC_INTERN(dst, table, gb, name, bits, max_depth)
Subset of GET_VLC for use in hand-roller VLC code.
int width
picture width / height.
static const unsigned char classic_shift_chroma[classic_shift_chroma_table_size+AV_INPUT_BUFFER_PADDING_SIZE]
int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table, int n)
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
#define LAST_SKIP_BITS(name, gb, num)
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
packed RGB 8:8:8, 24bpp, BGRBGR...
#define AV_PIX_FMT_YUVA444P10
AVCodec ff_ffvhuff_decoder
#define AV_PIX_FMT_YUV444P9
#define AV_PIX_FMT_GBRP14
#define SHOW_UBITS(name, gb, num)
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
#define AV_PIX_FMT_YUV420P16
static void add_bytes(HYuvContext *s, uint8_t *dst, uint8_t *src, int w)
int(* add_left_pred_int16)(uint16_t *dst, const uint16_t *src, unsigned mask, ptrdiff_t w, unsigned left)
#define AV_PIX_FMT_YUV420P14
AVCodec ff_huffyuv_decoder
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
static const int16_t alpha[]
main external API structure.
packed YUV 4:2:2, 16bpp, Y0 Cb Y1 Cr
#define OPEN_READER(name, gb)
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2]...the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so...,+,-,+,-,+,+,-,+,-,+,...hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32-hcoeff[1]-hcoeff[2]-...a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2}an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||.........intra?||||:Block01:yes no||||:Block02:.................||||:Block03::y DC::ref index:||||:Block04::cb DC::motion x:||||.........:cr DC::motion y:||||.................|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------------------------------|||Y subbands||Cb subbands||Cr subbands||||------||------||------|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||------||------||------||||------||------||------|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||------||------||------||||------||------||------|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||------||------||------||||------||------||------|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------------------------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction------------|\Dequantization-------------------\||Reference frames|\IDWT|--------------|Motion\|||Frame 0||Frame 1||Compensation.OBMC v-------|--------------|--------------.\------> Frame n output Frame Frame<----------------------------------/|...|-------------------Range Coder:============Binary Range Coder:-------------------The implemented range coder is an adapted version based upon"Range encoding: an algorithm for removing redundancy from a digitised message."by G.N.N.Martin.The symbols encoded by the Snow range coder are bits(0|1).The associated probabilities are not fix but change depending on the symbol mix seen so far.bit seen|new state---------+-----------------------------------------------0|256-state_transition_table[256-old_state];1|state_transition_table[old_state];state_transition_table={0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:-------------------------FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1.the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
void ff_llviddsp_init(LLVidDSPContext *c)
#define AV_PIX_FMT_YUV420P10
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
static void skip_bits(GetBitContext *s, int n)
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
av_cold void ff_huffyuvdsp_init(HuffYUVDSPContext *c, enum AVPixelFormat pix_fmt)
static void decode_gray_bitstream(HYuvContext *s, int count)
#define AV_PIX_FMT_YUV420P9
#define classic_shift_luma_table_size
const VDPAUPixFmtMap * map
static av_const int sign_extend(int val, unsigned bits)
#define AV_PIX_FMT_YUV422P14
#define AV_PIX_FMT_GBRP12
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
#define AV_PIX_FMT_YUV422P10
#define AV_PIX_FMT_YUV444P12
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static av_cold int decode_init(AVCodecContext *avctx)
void(* add_hfyu_left_pred_bgr32)(uint8_t *dst, const uint8_t *src, intptr_t w, uint8_t *left)
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
#define BITS_LEFT(name, gb)
planar GBRA 4:4:4:4 32bpp
void(* add_hfyu_median_pred_int16)(uint16_t *dst, const uint16_t *top, const uint16_t *diff, unsigned mask, int w, int *left, int *left_top)
#define AV_PIX_FMT_YUVA444P9
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
av_cold void ff_huffyuv_common_init(AVCodecContext *avctx)
static av_cold int decode_end(AVCodecContext *avctx)
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
static av_always_inline int diff(const uint32_t a, const uint32_t b)
static const unsigned char classic_add_chroma[256]
VLC_TYPE(* table)[2]
code, bits
static int left_prediction(HYuvContext *s, uint8_t *dst, const uint8_t *src, int w, int acc)
static const unsigned char classic_shift_luma[classic_shift_luma_table_size+AV_INPUT_BUFFER_PADDING_SIZE]
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
static int decode_slice(AVCodecContext *avctx, AVFrame *p, int height, int buf_size, int y_offset, int table_size)
uint32_t bits[4][MAX_VLC_N]
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(* add_bytes)(uint8_t *dst, uint8_t *src, ptrdiff_t w)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
static double val(void *priv, double ch)
This structure stores compressed data.
static void decorrelate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median)
void ff_free_vlc(VLC *vlc)
static int read_len_table(uint8_t *dst, GetBitContext *gb, int n)
#define OP8bits(dst0, dst1, code)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators...
#define AV_PIX_FMT_YUV422P16
static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
#define AV_PIX_FMT_0RGB32