49 while ((
c->high >> 15) - (
c->low >> 15) < 2) {
50 if ((
c->low ^
c->high) & 0x10000) {
55 c->high = (uint16_t)
c->high << 8 | 0xFF;
56 c->value = (uint16_t)
c->value << 8 | bytestream2_get_byte(
c->gbc.gB);
57 c->low = (uint16_t)
c->low << 8;
68 int split = (n << 1) - range;
77 int low,
int high,
int n)
79 int split = (n << 1) - range;
86 c->high +=
c->low - 1;
96 int range =
c->high -
c->low + 1;
100 if (n << scale > range)
116 int range =
c->high -
c->low + 1, n = *probs;
120 if (n << scale > range)
126 while (probs[++
i] >
val) ;
129 probs[
i] << scale, probs[
i - 1] << scale, n);
138 int diff = (
c->high >> 16) - (
c->low >> 16);
142 while (!(
diff & 0x80)) {
147 return (
bits + bp + 7 >> 3) + ((
c->low >> 16) + 1 ==
c->high >> 16);
154 c->value = bytestream2_get_be24(gB);
157 c->get_model_sym = arith2_get_model_sym;
164 uint32_t *pal =
ctx->pal + 256 -
ctx->free_colours;
166 if (!
ctx->free_colours)
170 if (ncol >
ctx->free_colours || buf_size < 2 + ncol * 3)
172 for (
i = 0;
i < ncol;
i++)
179 int keyframe,
int w,
int h)
181 int last_symbol = 0, repeat = 0, prev_avail = 0;
184 int x, y, endx, endy, t;
186 #define READ_PAIR(a, b) \
187 a = bytestream2_get_byte(gB) << 4; \
188 t = bytestream2_get_byte(gB); \
190 b = (t & 0xF) << 8; \
191 b |= bytestream2_get_byte(gB); \
196 if (endx >=
w || endy >=
h || x > endx || y > endy)
209 int b = bytestream2_get_byte(gB);
211 last_symbol =
b << 8 | bytestream2_get_byte(gB);
215 if (repeat >= (INT_MAX >> 8) - 1) {
219 repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
221 if (last_symbol == -2) {
222 int skip =
FFMIN((
unsigned)repeat, dst +
w - p);
227 last_symbol = 127 -
b;
229 if (last_symbol >= 0)
231 else if (last_symbol == -1 && prev_avail)
233 }
while (++p < dst +
w);
242 uint8_t *rgb_dst, ptrdiff_t rgb_stride, uint32_t *pal,
243 int keyframe,
int kf_slipt,
int slice,
int w,
int h)
249 int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0;
250 int remaining_codes, surplus_codes,
i;
252 const int alphabet_size = 270 - keyframe;
254 int last_symbol = 0, repeat = 0, prev_avail = 0;
257 int x, y, clipw, cliph;
264 if (x + clipw >
w || y + cliph >
h)
266 pal_dst += pal_stride * y + x;
267 rgb_dst += rgb_stride * y + x * 3;
274 pal_dst += pal_stride * kf_slipt;
275 rgb_dst += rgb_stride * kf_slipt;
284 while (current_codes--) {
286 if (symbol >= 204 - keyframe)
287 symbol += 14 - keyframe;
288 else if (symbol > 189)
289 symbol =
get_bits1(gb) + (symbol << 1) - 190;
292 bits[symbol] = current_length;
293 codes[symbol] = next_code++;
298 remaining_codes = (1 << current_length) - next_code;
300 if (current_length > 22 || current_codes > remaining_codes)
302 }
while (current_codes != remaining_codes);
304 remaining_codes = alphabet_size - read_codes;
307 while ((surplus_codes = (2 << current_length) -
308 (next_code << 1) - remaining_codes) < 0) {
314 for (
i = 0;
i < alphabet_size;
i++)
316 if (surplus_codes-- == 0) {
320 bits[
i] = current_length;
321 codes[
i] = next_code++;
324 if (next_code != 1 << current_length)
327 if ((
i =
init_vlc(&vlc, 9, alphabet_size,
bits, 1, 1, codes, 4, 4, 0)) < 0)
349 repeat += (1 <<
b) - 1;
351 if (last_symbol == -2) {
352 int skip =
FFMIN(repeat, pal_dst +
w - pp);
358 last_symbol = 267 -
b;
360 if (last_symbol >= 0) {
363 }
else if (last_symbol == -1 && prev_avail) {
364 *pp = *(pp - pal_stride);
365 memcpy(rp, rp - rgb_stride, 3);
368 }
while (++pp < pal_dst +
w);
369 pal_dst += pal_stride;
370 rgb_dst += rgb_stride;
379 int x,
int y,
int w,
int h,
int wmv9_mask)
416 s->end_mb_y = (
h + 15) >> 4;
420 s->end_mb_y =
s->end_mb_y + 1 >> 1;
424 if (v->
end_mb_x ==
s->mb_width &&
s->end_mb_y ==
s->mb_height) {
428 "disabling error correction due to block count mismatch %dx%d != %dx%d\n",
429 v->
end_mb_x,
s->end_mb_y,
s->mb_width,
s->mb_height);
434 f =
s->current_picture.f;
437 ctx->dsp.upsample_plane(
f->data[0],
f->linesize[0],
w,
h);
438 ctx->dsp.upsample_plane(
f->data[1],
f->linesize[1],
w+1 >> 1,
h+1 >> 1);
439 ctx->dsp.upsample_plane(
f->data[2],
f->linesize[2],
w+1 >> 1,
h+1 >> 1);
442 "Asymmetric WMV9 rectangle subsampling");
447 ctx->dsp.mss2_blit_wmv9_masked(
c->rgb_pic + y *
c->rgb_stride + x * 3,
448 c->rgb_stride, wmv9_mask,
449 c->pal_pic + y *
c->pal_stride + x,
451 f->data[0],
f->linesize[0],
452 f->data[1],
f->data[2],
f->linesize[1],
455 ctx->dsp.mss2_blit_wmv9(
c->rgb_pic + y *
c->rgb_stride + x * 3,
457 f->data[0],
f->linesize[0],
458 f->data[1],
f->data[2],
f->linesize[1],
470 #define MAX_WMV9_RECTANGLES 20
471 #define ARITH2_PADDING 2
477 int buf_size = avpkt->
size;
485 int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
488 int used_rects = 0,
i, implicit_rect = 0,
av_uninit(wmv9_mask);
499 if (
c->slice_split > 0)
500 ctx->split_position =
c->slice_split;
501 else if (
c->slice_split < 0) {
517 if (
c->slice_split && (
ctx->split_position < 1 - is_555 ||
518 ctx->split_position > avctx->
height - 1))
528 if (is_555 && (has_wmv9 || has_mv ||
c->slice_split &&
ctx->split_position))
539 implicit_rect = !arith2_get_bit(&acoder);
541 while (arith2_get_bit(&acoder)) {
544 r = &wmv9rects[used_rects];
549 wmv9rects[used_rects - 1].
x) +
550 wmv9rects[used_rects - 1].
x;
557 if (implicit_rect && used_rects) {
565 wmv9rects[0].
w = avctx->
width;
566 wmv9rects[0].
h = avctx->
height;
570 for (
i = 0;
i < used_rects;
i++) {
571 if (!implicit_rect && arith2_get_bit(&acoder)) {
576 wmv9_mask = arith2_get_bit(&acoder) - 1;
590 if (keyframe && !is_555) {
604 if (
c->mvX < 0 ||
c->mvY < 0) {
610 if (
ctx->last_pic->data[0]) {
612 c->last_rgb_pic =
ctx->last_pic->data[0] +
613 ctx->last_pic->linesize[0] * (avctx->
height - 1);
624 c->last_rgb_pic =
NULL;
636 if (
decode_555(avctx, &gB, (uint16_t *)
c->rgb_pic,
c->rgb_stride >> 1,
652 c->rgb_pic,
c->rgb_stride,
c->pal, keyframe,
653 ctx->split_position, 0,
660 c->rgb_pic,
c->rgb_stride,
c->pal, keyframe,
661 ctx->split_position, 1,
668 }
else if (!implicit_rect || wmv9_mask != -1) {
673 c->keyframe = keyframe;
676 ctx->split_position))
681 if (
c->slice_split) {
696 memset(
c->pal_pic, 0,
c->pal_stride * avctx->
height);
700 for (
i = 0;
i < used_rects;
i++) {
701 int x = wmv9rects[
i].
x;
702 int y = wmv9rects[
i].
y;
703 int w = wmv9rects[
i].
w;
704 int h = wmv9rects[
i].
h;
706 int WMV9codedFrameSize;
707 if (buf_size < 4 || !(WMV9codedFrameSize =
AV_RL24(buf)))
709 if (ret =
decode_wmv9(avctx, buf + 3, buf_size - 3,
710 x,
y,
w,
h, wmv9_mask))
712 buf += WMV9codedFrameSize + 3;
713 buf_size -= WMV9codedFrameSize + 3;
715 uint8_t *dst =
c->rgb_pic +
y *
c->rgb_stride +
x * 3;
716 if (wmv9_mask != -1) {
717 ctx->dsp.mss2_gray_fill_masked(dst,
c->rgb_stride,
719 c->pal_pic +
y *
c->pal_stride +
x,
724 memset(dst, 0x80,
w * 3);
725 dst +=
c->rgb_stride;
735 if (
c->mvX < 0 ||
c->mvY < 0) {
829 c->pal_stride =
c->mask_stride;
832 if (!
c->pal_pic || !
c->last_pal_pic || !
ctx->last_pic) {
static double val(void *priv, double ch)
static char * split(char *message, char delim)
simple assert() macros that are a bit more flexible than ISO C assert().
#define av_assert0(cond)
assert() equivalent, that is always enabled.
static av_cold int init(AVCodecContext *avctx)
void ff_free_vlc(VLC *vlc)
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
static av_always_inline int bytestream2_tell(GetByteContext *g)
#define FFSWAP(type, a, b)
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
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)
void ff_er_frame_end(ERContext *s)
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
static unsigned int get_bits1(GetBitContext *s)
static void skip_bits(GetBitContext *s, int n)
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
static int get_bits_count(const GetBitContext *s)
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
static const uint8_t * align_get_bits(GetBitContext *s)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
@ AVDISCARD_ALL
discard all
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
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_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
@ AV_PICTURE_TYPE_I
Intra.
@ AV_PICTURE_TYPE_P
Predicted.
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
void ff_mpeg_er_frame_start(MpegEncContext *s)
int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
generic function called after decoding the header and before a frame is decoded.
void ff_mpv_frame_end(MpegEncContext *s)
void ff_mpeg_flush(AVCodecContext *avctx)
int ff_msmpeg4_decode_init(AVCodecContext *avctx)
int ff_mss12_decode_rect(SliceContext *sc, ArithCoder *acoder, int x, int y, int width, int height)
av_cold int ff_mss12_decode_end(MSS12Context *c)
av_cold int ff_mss12_decode_init(MSS12Context *c, int version, SliceContext *sc1, SliceContext *sc2)
void ff_mss12_slicecontext_reset(SliceContext *sc)
Common header for Microsoft Screen 1 and 2.
#define ARITH_GET_MODEL_SYM(prefix)
#define ARITH_GET_BIT(prefix)
static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
static void arith2_rescale_interval(ArithCoder *c, int range, int low, int high, int n)
static int arith2_get_scaled_value(int value, int n, int range)
static av_cold int mss2_decode_init(AVCodecContext *avctx)
static void arith2_normalise(ArithCoder *c)
static int arith2_get_prob(ArithCoder *c, int16_t *probs)
static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static av_cold int mss2_decode_end(AVCodecContext *avctx)
static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int x, int y, int w, int h, int wmv9_mask)
static int arith2_get_consumed_bytes(ArithCoder *c)
static void arith2_init(ArithCoder *c, GetByteContext *gB)
#define MAX_WMV9_RECTANGLES
static av_cold int wmv9_init(AVCodecContext *avctx)
static int arith2_get_number(ArithCoder *c, int n)
static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, ptrdiff_t pal_stride, uint8_t *rgb_dst, ptrdiff_t rgb_stride, uint32_t *pal, int keyframe, int kf_slipt, int slice, int w, int h)
static int decode_555(AVCodecContext *avctx, GetByteContext *gB, uint16_t *dst, ptrdiff_t stride, int keyframe, int w, int h)
av_cold void ff_mss2dsp_init(MSS2DSPContext *dsp)
Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder DSP routines.
@ AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
#define AV_PIX_FMT_RGB555
av_cold void ff_qpeldsp_init(QpelDSPContext *c)
main external API structure.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
int width
picture width / height.
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
enum AVDiscard skip_loop_filter
Skip loop filtering for selected frames.
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.
qpel_mc_func(* qpel_put)[16]
qpel_mc_func(* qpel_avg)[16]
int max_b_frames
max number of B-frames for encoding
struct AVCodecContext * avctx
qpel_mc_func avg_qpel_pixels_tab[2][16]
qpel_mc_func put_qpel_pixels_tab[2][16]
int profile
Sequence header data for all Profiles TODO: choose between ints, uint8_ts and monobit flags.
int dquant
How qscale varies with MBs, 2 bits (not in Simple)
int multires
frame-level RESPIC syntax element present
const uint8_t * zz_4x8
Zigzag scan table for TT_4x8 coding mode.
int finterpflag
INTERPFRM present.
int extended_mv
Ext MV in P/B (not in Simple)
int end_mb_x
Horizontal macroblock limit (used only by mss2)
int res_rtm_flag
reserved, set to 1
int res_fasttx
reserved, always 1
int res_sprite
Simple/Main Profile sequence header.
int quantizer_mode
2 bits, quantizer mode used for sequence, see QUANT_*
int res_y411
reserved, old interlaced mode
int overlap
overlapped transforms in use
int res_transtab
reserved, always 0
int bitrtq_postproc
5 bits, quantized framerate-based postprocessing strength
const uint8_t * zz_8x4
Zigzag scan table for TT_8x4 coding mode.
int resync_marker
could this stream contain resync markers
uint8_t respic
Frame-level flag for resized images.
int fastuvmc
Rounding of qpel vector to hpel ? (not in Simple)
int frmrtq_postproc
3 bits,
int rangered
RANGEREDFRM (range reduction) syntax element present at frame level.
int vstransform
variable-size [48]x[48] transform type + info
VLC_TYPE(* table)[2]
code, bits
#define avpriv_request_sample(...)
av_cold int ff_vc1_init_common(VC1Context *v)
Init VC-1 specific tables and VC1Context members.
int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext *gb)
int ff_vc1_decode_init_alloc_tables(VC1Context *v)
int ff_vc1_decode_end(AVCodecContext *avctx)
Close a VC1/WMV3 decoder.
void ff_vc1_decode_blocks(VC1Context *v)
void ff_vc1_init_transposed_scantables(VC1Context *v)
av_cold void ff_vc1dsp_init(VC1DSPContext *dsp)
static av_always_inline int diff(const uint32_t a, const uint32_t b)
#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
const uint8_t ff_wmv2_scantableA[64]
const uint8_t ff_wmv2_scantableB[64]