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FFmpeg/libavcodec/mss2.c
Andreas Rheinhardt fe6037fd04 avcodec/mpegpicture: Split MPVPicture into WorkPicture and ordinary Pic 
There are two types of MPVPictures: Three (cur_pic, last_pic, next_pic)
that are directly part of MpegEncContext and an array of MPVPictures
that are separately allocated and are mostly accessed via pointers
(cur|last|next)_pic_ptr; they are also used to store AVFrames in the
encoder (necessary due to B-frames). As the name implies, each of the
former is directly associated with one of the _ptr pointers:
They actually share the same underlying buffers, but the ones
that are part of the context can have their data pointers offset
and their linesize doubled for field pictures.

Up until now, each of these had their own references; in particular,
there was an underlying av_frame_ref() to sync cur_pic and cur_pic_ptr
etc. This is wasteful.

This commit changes this relationship: cur_pic, last_pic and next_pic
now become MPVWorkPictures; this structure does not have an AVFrame
at all any more, but only the cached values of data and linesize.
It also contains a pointer to the corresponding MPVPicture, establishing
a more natural relationsship between the two.
This already means that creating the context-pictures from the pointers
can no longer fail.

What has not been changed is the fact that the MPVPicture* pointers
are not ownership pointers and that the MPVPictures are part of an
array of MPVPictures that is owned by a single AVCodecContext.
Doing so will be done in a latter commit.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-06-12 11:38:13 +02:00

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/*
* Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
*/
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "codec_internal.h"
#include "decode.h"
#include "error_resilience.h"
#include "mpeg_er.h"
#include "mpegvideodec.h"
#include "vc1.h"
#include "wmv2data.h"
#include "mss12.h"
#include "mss2dsp.h"
typedef struct MSS2Context {
VC1Context v;
int split_position;
AVFrame *last_pic;
MSS12Context c;
MSS2DSPContext dsp;
SliceContext sc[2];
} MSS2Context;
static void arith2_normalise(ArithCoder *c)
{
while ((c->high >> 15) - (c->low >> 15) < 2) {
if ((c->low ^ c->high) & 0x10000) {
c->high ^= 0x8000;
c->value ^= 0x8000;
c->low ^= 0x8000;
}
c->high = (uint16_t)c->high << 8 | 0xFF;
c->value = (uint16_t)c->value << 8 | bytestream2_get_byte(c->gbc.gB);
c->low = (uint16_t)c->low << 8;
}
}
ARITH_GET_BIT(arith2)
/* L. Stuiver and A. Moffat: "Piecewise Integer Mapping for Arithmetic Coding."
* In Proc. 8th Data Compression Conference (DCC '98), pp. 3-12, Mar. 1998 */
static int arith2_get_scaled_value(int value, int n, int range)
{
int split = (n << 1) - range;
if (value > split)
return split + (value - split >> 1);
else
return value;
}
static void arith2_rescale_interval(ArithCoder *c, int range,
int low, int high, int n)
{
int split = (n << 1) - range;
if (high > split)
c->high = split + (high - split << 1);
else
c->high = high;
c->high += c->low - 1;
if (low > split)
c->low += split + (low - split << 1);
else
c->low += low;
}
static int arith2_get_number(ArithCoder *c, int n)
{
int range = c->high - c->low + 1;
int scale = av_log2(range) - av_log2(n);
int val;
if (n << scale > range)
scale--;
n <<= scale;
val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
arith2_rescale_interval(c, range, val << scale, (val + 1) << scale, n);
arith2_normalise(c);
return val;
}
static int arith2_get_prob(ArithCoder *c, int16_t *probs)
{
int range = c->high - c->low + 1, n = *probs;
int scale = av_log2(range) - av_log2(n);
int i = 0, val;
if (n << scale > range)
scale--;
n <<= scale;
val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
while (probs[++i] > val) ;
arith2_rescale_interval(c, range,
probs[i] << scale, probs[i - 1] << scale, n);
return i;
}
ARITH_GET_MODEL_SYM(arith2)
static int arith2_get_consumed_bytes(ArithCoder *c)
{
int diff = (c->high >> 16) - (c->low >> 16);
int bp = bytestream2_tell(c->gbc.gB) - 3 << 3;
int bits = 1;
while (!(diff & 0x80)) {
bits++;
diff <<= 1;
}
return (bits + bp + 7 >> 3) + ((c->low >> 16) + 1 == c->high >> 16);
}
static void arith2_init(ArithCoder *c, GetByteContext *gB)
{
c->low = 0;
c->high = 0xFFFFFF;
c->value = bytestream2_get_be24(gB);
c->overread = 0;
c->gbc.gB = gB;
c->get_model_sym = arith2_get_model_sym;
c->get_number = arith2_get_number;
}
static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
{
int i, ncol;
uint32_t *pal = ctx->pal + 256 - ctx->free_colours;
if (!ctx->free_colours)
return 0;
ncol = *buf++;
if (ncol > ctx->free_colours || buf_size < 2 + ncol * 3)
return AVERROR_INVALIDDATA;
for (i = 0; i < ncol; i++)
*pal++ = AV_RB24(buf + 3 * i);
return 1 + ncol * 3;
}
static int decode_555(AVCodecContext *avctx, GetByteContext *gB, uint16_t *dst, ptrdiff_t stride,
int keyframe, int w, int h)
{
int last_symbol = 0, repeat = 0, prev_avail = 0;
if (!keyframe) {
int x, y, endx, endy, t;
#define READ_PAIR(a, b) \
a = bytestream2_get_byte(gB) << 4; \
t = bytestream2_get_byte(gB); \
a |= t >> 4; \
b = (t & 0xF) << 8; \
b |= bytestream2_get_byte(gB); \
READ_PAIR(x, endx)
READ_PAIR(y, endy)
if (endx >= w || endy >= h || x > endx || y > endy)
return AVERROR_INVALIDDATA;
dst += x + stride * y;
w = endx - x + 1;
h = endy - y + 1;
if (y)
prev_avail = 1;
}
do {
uint16_t *p = dst;
do {
if (repeat-- < 1) {
int b = bytestream2_get_byte(gB);
if (b < 128)
last_symbol = b << 8 | bytestream2_get_byte(gB);
else if (b > 129) {
repeat = 0;
while (b-- > 130) {
if (repeat >= (INT_MAX >> 8) - 1) {
av_log(avctx, AV_LOG_ERROR, "repeat overflow\n");
return AVERROR_INVALIDDATA;
}
repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
}
if (last_symbol == -2) {
int skip = FFMIN((unsigned)repeat, dst + w - p);
repeat -= skip;
p += skip;
}
} else
last_symbol = 127 - b;
}
if (last_symbol >= 0)
*p = last_symbol;
else if (last_symbol == -1 && prev_avail)
*p = *(p - stride);
} while (++p < dst + w);
dst += stride;
prev_avail = 1;
} while (--h);
return 0;
}
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)
{
uint8_t bits[270] = { 0 };
uint32_t codes[270];
VLC vlc;
int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0;
int remaining_codes, surplus_codes, i;
const int alphabet_size = 270 - keyframe;
int last_symbol = 0, repeat = 0, prev_avail = 0;
if (!keyframe) {
int x, y, clipw, cliph;
x = get_bits(gb, 12);
y = get_bits(gb, 12);
clipw = get_bits(gb, 12) + 1;
cliph = get_bits(gb, 12) + 1;
if (x + clipw > w || y + cliph > h)
return AVERROR_INVALIDDATA;
pal_dst += pal_stride * y + x;
rgb_dst += rgb_stride * y + x * 3;
w = clipw;
h = cliph;
if (y)
prev_avail = 1;
} else {
if (slice > 0) {
pal_dst += pal_stride * kf_slipt;
rgb_dst += rgb_stride * kf_slipt;
prev_avail = 1;
h -= kf_slipt;
} else
h = kf_slipt;
}
/* read explicit codes */
do {
while (current_codes--) {
int symbol = get_bits(gb, 8);
if (symbol >= 204 - keyframe)
symbol += 14 - keyframe;
else if (symbol > 189)
symbol = get_bits1(gb) + (symbol << 1) - 190;
if (bits[symbol])
return AVERROR_INVALIDDATA;
bits[symbol] = current_length;
codes[symbol] = next_code++;
read_codes++;
}
current_length++;
next_code <<= 1;
remaining_codes = (1 << current_length) - next_code;
current_codes = get_bits(gb, av_ceil_log2(remaining_codes + 1));
if (current_length > 22 || current_codes > remaining_codes)
return AVERROR_INVALIDDATA;
} while (current_codes != remaining_codes);
remaining_codes = alphabet_size - read_codes;
/* determine the minimum length to fit the rest of the alphabet */
while ((surplus_codes = (2 << current_length) -
(next_code << 1) - remaining_codes) < 0) {
current_length++;
next_code <<= 1;
}
/* add the rest of the symbols lexicographically */
for (i = 0; i < alphabet_size; i++)
if (!bits[i]) {
if (surplus_codes-- == 0) {
current_length++;
next_code <<= 1;
}
bits[i] = current_length;
codes[i] = next_code++;
}
if (next_code != 1 << current_length)
return AVERROR_INVALIDDATA;
if ((i = vlc_init(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0)) < 0)
return i;
/* frame decode */
do {
uint8_t *pp = pal_dst;
uint8_t *rp = rgb_dst;
do {
if (repeat-- < 1) {
int b = get_vlc2(gb, vlc.table, 9, 3);
if (b < 256)
last_symbol = b;
else if (b < 268) {
b -= 256;
if (b == 11)
b = get_bits(gb, 4) + 10;
if (!b)
repeat = 0;
else
repeat = get_bits(gb, b);
repeat += (1 << b) - 1;
if (last_symbol == -2) {
int skip = FFMIN(repeat, pal_dst + w - pp);
repeat -= skip;
pp += skip;
rp += skip * 3;
}
} else
last_symbol = 267 - b;
}
if (last_symbol >= 0) {
*pp = last_symbol;
AV_WB24(rp, pal[last_symbol]);
} else if (last_symbol == -1 && prev_avail) {
*pp = *(pp - pal_stride);
memcpy(rp, rp - rgb_stride, 3);
}
rp += 3;
} while (++pp < pal_dst + w);
pal_dst += pal_stride;
rgb_dst += rgb_stride;
prev_avail = 1;
} while (--h);
ff_vlc_free(&vlc);
return 0;
}
static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
int x, int y, int w, int h, int wmv9_mask)
{
MSS2Context *ctx = avctx->priv_data;
MSS12Context *c = &ctx->c;
VC1Context *v = avctx->priv_data;
MpegEncContext *s = &v->s;
MPVWorkPicture *f;
int ret;
ff_mpeg_flush(avctx);
if ((ret = init_get_bits8(&s->gb, buf, buf_size)) < 0)
return ret;
s->loop_filter = avctx->skip_loop_filter < AVDISCARD_ALL;
if (ff_vc1_parse_frame_header(v, &s->gb) < 0) {
av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
return AVERROR_INVALIDDATA;
}
if (s->pict_type != AV_PICTURE_TYPE_I) {
av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n");
return AVERROR_INVALIDDATA;
}
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
if ((ret = ff_mpv_frame_start(s, avctx)) < 0) {
av_log(v->s.avctx, AV_LOG_ERROR, "ff_mpv_frame_start error\n");
avctx->pix_fmt = AV_PIX_FMT_RGB24;
return ret;
}
ff_mpeg_er_frame_start(s);
v->end_mb_x = (w + 15) >> 4;
s->end_mb_y = (h + 15) >> 4;
if (v->respic & 1)
v->end_mb_x = v->end_mb_x + 1 >> 1;
if (v->respic & 2)
s->end_mb_y = s->end_mb_y + 1 >> 1;
ff_vc1_decode_blocks(v);
if (v->end_mb_x == s->mb_width && s->end_mb_y == s->mb_height) {
ff_er_frame_end(&s->er, NULL);
} else {
av_log(v->s.avctx, AV_LOG_WARNING,
"disabling error correction due to block count mismatch %dx%d != %dx%d\n",
v->end_mb_x, s->end_mb_y, s->mb_width, s->mb_height);
}
ff_mpv_frame_end(s);
f = &s->cur_pic;
if (v->respic == 3) {
ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h);
ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w+1 >> 1, h+1 >> 1);
ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w+1 >> 1, h+1 >> 1);
} else if (v->respic)
avpriv_request_sample(v->s.avctx,
"Asymmetric WMV9 rectangle subsampling");
av_assert0(f->linesize[1] == f->linesize[2]);
if (wmv9_mask != -1)
ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3,
c->rgb_stride, wmv9_mask,
c->pal_pic + y * c->pal_stride + x,
c->pal_stride,
f->data[0], f->linesize[0],
f->data[1], f->data[2], f->linesize[1],
w, h);
else
ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3,
c->rgb_stride,
f->data[0], f->linesize[0],
f->data[1], f->data[2], f->linesize[1],
w, h);
avctx->pix_fmt = AV_PIX_FMT_RGB24;
return 0;
}
struct Rectangle {
int coded, x, y, w, h;
};
struct Rectangle2 {
int left, right, top, bottom;
};
static void calc_draw_region(struct Rectangle2 * draw, const struct Rectangle2 * rect)
{
#define COMPARE(top, bottom, left, right) \
if (rect->top <= draw->top && rect->bottom >= draw->bottom) { \
if (rect->left <= draw->left && rect->right >= draw->left) \
draw->left = FFMIN(rect->right, draw->right); \
\
if (rect->right >= draw->right) { \
if (rect->left >= draw->left) { \
if (rect->left < draw->right) \
draw->right = rect->left; \
} else { \
draw->right = draw->left; \
} \
} \
}
COMPARE(top, bottom, left, right)
COMPARE(left, right, top, bottom)
}
static int calc_split_position(int split_position, const struct Rectangle2 * rect, int height)
{
if (rect->top || rect->bottom != height)
split_position = rect->top + split_position * (rect->bottom - rect->top) / height;
return av_clip(split_position, rect->top + 1, rect->bottom - 1);
}
#define MAX_WMV9_RECTANGLES 20
#define ARITH2_PADDING 2
static int mss2_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MSS2Context *ctx = avctx->priv_data;
MSS12Context *c = &ctx->c;
GetBitContext gb;
GetByteContext gB;
ArithCoder acoder;
int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
struct Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
struct Rectangle2 draw;
int used_rects = 0, i, implicit_rect = 0, wmv9_mask = -1;
if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
return ret;
if (keyframe = get_bits1(&gb))
skip_bits(&gb, 7);
has_wmv9 = get_bits1(&gb);
has_mv = keyframe ? 0 : get_bits1(&gb);
is_rle = get_bits1(&gb);
is_555 = is_rle && get_bits1(&gb);
if (c->slice_split > 0)
ctx->split_position = c->slice_split;
else if (c->slice_split < 0) {
if (get_bits1(&gb)) {
if (get_bits1(&gb)) {
if (get_bits1(&gb))
ctx->split_position = get_bits(&gb, 16);
else
ctx->split_position = get_bits(&gb, 12);
} else
ctx->split_position = get_bits(&gb, 8) << 4;
} else {
if (keyframe)
ctx->split_position = avctx->height / 2;
}
} else
ctx->split_position = avctx->height;
if (c->slice_split && (ctx->split_position < 1 - is_555 ||
ctx->split_position > avctx->height - 1))
return AVERROR_INVALIDDATA;
align_get_bits(&gb);
buf += get_bits_count(&gb) >> 3;
buf_size -= get_bits_count(&gb) >> 3;
if (buf_size < 1)
return AVERROR_INVALIDDATA;
if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position))
return AVERROR_INVALIDDATA;
avctx->pix_fmt = is_555 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_RGB24;
if (ctx->last_pic->format != avctx->pix_fmt)
av_frame_unref(ctx->last_pic);
if (has_wmv9) {
bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
arith2_init(&acoder, &gB);
implicit_rect = !arith2_get_bit(&acoder);
while (arith2_get_bit(&acoder)) {
if (used_rects == MAX_WMV9_RECTANGLES)
return AVERROR_INVALIDDATA;
r = &wmv9rects[used_rects];
if (!used_rects)
r->x = arith2_get_number(&acoder, avctx->width);
else
r->x = arith2_get_number(&acoder, avctx->width -
wmv9rects[used_rects - 1].x) +
wmv9rects[used_rects - 1].x;
r->y = arith2_get_number(&acoder, avctx->height);
r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1;
r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1;
used_rects++;
}
if (implicit_rect && used_rects) {
av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n");
return AVERROR_INVALIDDATA;
}
if (implicit_rect) {
wmv9rects[0].x = 0;
wmv9rects[0].y = 0;
wmv9rects[0].w = avctx->width;
wmv9rects[0].h = avctx->height;
used_rects = 1;
}
for (i = 0; i < used_rects; i++) {
if (!implicit_rect && arith2_get_bit(&acoder)) {
av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n");
return AVERROR_INVALIDDATA;
}
if (!i) {
wmv9_mask = arith2_get_bit(&acoder) - 1;
if (!wmv9_mask)
wmv9_mask = arith2_get_number(&acoder, 256);
}
wmv9rects[i].coded = arith2_get_number(&acoder, 2);
}
buf += arith2_get_consumed_bytes(&acoder);
buf_size -= arith2_get_consumed_bytes(&acoder);
if (buf_size < 1)
return AVERROR_INVALIDDATA;
}
c->mvX = c->mvY = 0;
if (keyframe && !is_555) {
if ((i = decode_pal_v2(c, buf, buf_size)) < 0)
return AVERROR_INVALIDDATA;
buf += i;
buf_size -= i;
} else if (has_mv) {
buf += 4;
buf_size -= 4;
if (buf_size < 1)
return AVERROR_INVALIDDATA;
c->mvX = AV_RB16(buf - 4) - avctx->width;
c->mvY = AV_RB16(buf - 2) - avctx->height;
}
if (c->mvX < 0 || c->mvY < 0) {
FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic);
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
if (ctx->last_pic->data[0]) {
av_assert0(frame->linesize[0] == ctx->last_pic->linesize[0]);
c->last_rgb_pic = ctx->last_pic->data[0] +
ctx->last_pic->linesize[0] * (avctx->height - 1);
} else {
av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n");
return AVERROR_INVALIDDATA;
}
} else {
if ((ret = ff_reget_buffer(avctx, ctx->last_pic, 0)) < 0)
return ret;
if ((ret = av_frame_ref(frame, ctx->last_pic)) < 0)
return ret;
c->last_rgb_pic = NULL;
}
c->rgb_pic = frame->data[0] +
frame->linesize[0] * (avctx->height - 1);
c->rgb_stride = -frame->linesize[0];
if (keyframe)
frame->flags |= AV_FRAME_FLAG_KEY;
else
frame->flags &= ~AV_FRAME_FLAG_KEY;
frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
if (is_555) {
bytestream2_init(&gB, buf, buf_size);
if (decode_555(avctx, &gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
keyframe, avctx->width, avctx->height))
return AVERROR_INVALIDDATA;
buf_size -= bytestream2_tell(&gB);
} else {
if (keyframe) {
c->corrupted = 0;
ff_mss12_slicecontext_reset(&ctx->sc[0]);
if (c->slice_split)
ff_mss12_slicecontext_reset(&ctx->sc[1]);
}
if (is_rle) {
if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
return ret;
if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
c->rgb_pic, c->rgb_stride, c->pal, keyframe,
ctx->split_position, 0,
avctx->width, avctx->height))
return ret;
align_get_bits(&gb);
if (c->slice_split)
if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
c->rgb_pic, c->rgb_stride, c->pal, keyframe,
ctx->split_position, 1,
avctx->width, avctx->height))
return ret;
align_get_bits(&gb);
buf += get_bits_count(&gb) >> 3;
buf_size -= get_bits_count(&gb) >> 3;
} else if (!implicit_rect || wmv9_mask != -1) {
if (c->corrupted)
return AVERROR_INVALIDDATA;
bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
arith2_init(&acoder, &gB);
c->keyframe = keyframe;
draw.left = 0;
draw.top = 0;
draw.right = avctx->width;
draw.bottom = avctx->height;
if (wmv9_mask == -1) {
for (i = 0; i < used_rects; i++) {
struct Rectangle2 r;
r.left = wmv9rects[i].x;
r.top = wmv9rects[i].y;
r.right = r.left + wmv9rects[i].w;
r.bottom = r.top + wmv9rects[i].h;
calc_draw_region(&draw, &r);
}
}
if (draw.left >= avctx->width || draw.right > avctx->width ||
draw.top >= avctx->height || draw.bottom > avctx->height)
return AVERROR_INVALIDDATA;
if (c->slice_split && draw.bottom - draw.top >= 10) {
ctx->split_position = calc_split_position(ctx->split_position, &draw, avctx->height);
if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[0], &acoder, 0, draw.top,
avctx->width,
ctx->split_position - draw.top))
return AVERROR_INVALIDDATA;
buf += arith2_get_consumed_bytes(&acoder);
buf_size -= arith2_get_consumed_bytes(&acoder);
if (c->slice_split) {
if (buf_size < 1)
return AVERROR_INVALIDDATA;
bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
arith2_init(&acoder, &gB);
if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[1], &acoder, 0,
ctx->split_position,
avctx->width,
draw.bottom - ctx->split_position))
return AVERROR_INVALIDDATA;
buf += arith2_get_consumed_bytes(&acoder);
buf_size -= arith2_get_consumed_bytes(&acoder);
}
} else {
if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[0], &acoder, draw.left, draw.top,
draw.right - draw.left, draw.bottom - draw.top))
return AVERROR_INVALIDDATA;
buf += arith2_get_consumed_bytes(&acoder);
buf_size -= arith2_get_consumed_bytes(&acoder);
}
} else
memset(c->pal_pic, 0, c->pal_stride * avctx->height);
}
if (has_wmv9) {
for (i = 0; i < used_rects; i++) {
int x = wmv9rects[i].x;
int y = wmv9rects[i].y;
int w = wmv9rects[i].w;
int h = wmv9rects[i].h;
if (wmv9rects[i].coded) {
int WMV9codedFrameSize;
if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf)))
return AVERROR_INVALIDDATA;
if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3,
x, y, w, h, wmv9_mask))
return ret;
buf += WMV9codedFrameSize + 3;
buf_size -= WMV9codedFrameSize + 3;
} else {
uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3;
if (wmv9_mask != -1) {
ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride,
wmv9_mask,
c->pal_pic + y * c->pal_stride + x,
c->pal_stride,
w, h);
} else {
do {
memset(dst, 0x80, w * 3);
dst += c->rgb_stride;
} while (--h);
}
}
}
}
if (buf_size)
av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n");
if (c->mvX < 0 || c->mvY < 0) {
ret = av_frame_replace(ctx->last_pic, frame);
if (ret < 0)
return ret;
}
*got_frame = 1;
return avpkt->size;
}
static av_cold int wmv9_init(AVCodecContext *avctx)
{
VC1Context *v = avctx->priv_data;
int ret;
v->s.avctx = avctx;
ff_vc1_init_common(v);
v->profile = PROFILE_MAIN;
v->zz_8x4 = ff_wmv2_scantableA;
v->zz_4x8 = ff_wmv2_scantableB;
v->res_y411 = 0;
v->res_sprite = 0;
v->frmrtq_postproc = 7;
v->bitrtq_postproc = 31;
v->res_x8 = 0;
v->multires = 0;
v->res_fasttx = 1;
v->fastuvmc = 0;
v->extended_mv = 0;
v->dquant = 1;
v->vstransform = 1;
v->res_transtab = 0;
v->overlap = 0;
v->resync_marker = 0;
v->rangered = 0;
v->s.max_b_frames = avctx->max_b_frames = 0;
v->quantizer_mode = 0;
v->finterpflag = 0;
v->res_rtm_flag = 1;
ff_vc1_init_transposed_scantables(v);
ret = ff_vc1_decode_init(avctx);
if (ret < 0)
return ret;
return 0;
}
static av_cold int mss2_decode_end(AVCodecContext *avctx)
{
MSS2Context *const ctx = avctx->priv_data;
av_frame_free(&ctx->last_pic);
ff_mss12_decode_end(&ctx->c);
av_freep(&ctx->c.pal_pic);
av_freep(&ctx->c.last_pal_pic);
ff_vc1_decode_end(avctx);
return 0;
}
static av_cold int mss2_decode_init(AVCodecContext *avctx)
{
MSS2Context * const ctx = avctx->priv_data;
MSS12Context *c = &ctx->c;
int ret;
c->avctx = avctx;
if (ret = ff_mss12_decode_init(c, 1, &ctx->sc[0], &ctx->sc[1]))
return ret;
ctx->last_pic = av_frame_alloc();
c->pal_stride = c->mask_stride;
c->pal_pic = av_mallocz(c->pal_stride * avctx->height);
c->last_pal_pic = av_mallocz(c->pal_stride * avctx->height);
if (!c->pal_pic || !c->last_pal_pic || !ctx->last_pic)
return AVERROR(ENOMEM);
if (ret = wmv9_init(avctx))
return ret;
ff_mss2dsp_init(&ctx->dsp);
avctx->pix_fmt = c->free_colours == 127 ? AV_PIX_FMT_RGB555
: AV_PIX_FMT_RGB24;
return 0;
}
const FFCodec ff_mss2_decoder = {
.p.name = "mss2",
CODEC_LONG_NAME("MS Windows Media Video V9 Screen"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MSS2,
.priv_data_size = sizeof(MSS2Context),
.init = mss2_decode_init,
.close = mss2_decode_end,
FF_CODEC_DECODE_CB(mss2_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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