yading@10: /*
yading@10:  * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "error_resilience.h"
yading@10: #include "internal.h"
yading@10: #include "msmpeg4data.h"
yading@10: #include "vc1.h"
yading@10: #include "mss12.h"
yading@10: #include "mss2dsp.h"
yading@10: 
yading@10: typedef struct MSS2Context {
yading@10:     VC1Context     v;
yading@10:     int            split_position;
yading@10:     AVFrame        last_pic;
yading@10:     MSS12Context   c;
yading@10:     MSS2DSPContext dsp;
yading@10:     SliceContext   sc[2];
yading@10: } MSS2Context;
yading@10: 
yading@10: static void arith2_normalise(ArithCoder *c)
yading@10: {
yading@10:     while ((c->high >> 15) - (c->low >> 15) < 2) {
yading@10:         if ((c->low ^ c->high) & 0x10000) {
yading@10:             c->high  ^= 0x8000;
yading@10:             c->value ^= 0x8000;
yading@10:             c->low   ^= 0x8000;
yading@10:         }
yading@10:         c->high  = c->high  << 8 & 0xFFFFFF | 0xFF;
yading@10:         c->value = c->value << 8 & 0xFFFFFF | bytestream2_get_byte(c->gbc.gB);
yading@10:         c->low   = c->low   << 8 & 0xFFFFFF;
yading@10:     }
yading@10: }
yading@10: 
yading@10: ARITH_GET_BIT(2)
yading@10: 
yading@10: /* L. Stuiver and A. Moffat: "Piecewise Integer Mapping for Arithmetic Coding."
yading@10:  * In Proc. 8th Data Compression Conference (DCC '98), pp. 3-12, Mar. 1998 */
yading@10: 
yading@10: static int arith2_get_scaled_value(int value, int n, int range)
yading@10: {
yading@10:     int split = (n << 1) - range;
yading@10: 
yading@10:     if (value > split)
yading@10:         return split + (value - split >> 1);
yading@10:     else
yading@10:         return value;
yading@10: }
yading@10: 
yading@10: static void arith2_rescale_interval(ArithCoder *c, int range,
yading@10:                                     int low, int high, int n)
yading@10: {
yading@10:     int split = (n << 1) - range;
yading@10: 
yading@10:     if (high > split)
yading@10:         c->high = split + (high - split << 1);
yading@10:     else
yading@10:         c->high = high;
yading@10: 
yading@10:     c->high += c->low - 1;
yading@10: 
yading@10:     if (low > split)
yading@10:         c->low += split + (low - split << 1);
yading@10:     else
yading@10:         c->low += low;
yading@10: }
yading@10: 
yading@10: static int arith2_get_number(ArithCoder *c, int n)
yading@10: {
yading@10:     int range = c->high - c->low + 1;
yading@10:     int scale = av_log2(range) - av_log2(n);
yading@10:     int val;
yading@10: 
yading@10:     if (n << scale > range)
yading@10:         scale--;
yading@10: 
yading@10:     n <<= scale;
yading@10: 
yading@10:     val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
yading@10: 
yading@10:     arith2_rescale_interval(c, range, val << scale, (val + 1) << scale, n);
yading@10: 
yading@10:     arith2_normalise(c);
yading@10: 
yading@10:     return val;
yading@10: }
yading@10: 
yading@10: static int arith2_get_prob(ArithCoder *c, int16_t *probs)
yading@10: {
yading@10:     int range = c->high - c->low + 1, n = *probs;
yading@10:     int scale = av_log2(range) - av_log2(n);
yading@10:     int i     = 0, val;
yading@10: 
yading@10:     if (n << scale > range)
yading@10:         scale--;
yading@10: 
yading@10:     n <<= scale;
yading@10: 
yading@10:     val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale;
yading@10:     while (probs[++i] > val) ;
yading@10: 
yading@10:     arith2_rescale_interval(c, range,
yading@10:                             probs[i] << scale, probs[i - 1] << scale, n);
yading@10: 
yading@10:     return i;
yading@10: }
yading@10: 
yading@10: ARITH_GET_MODEL_SYM(2)
yading@10: 
yading@10: static int arith2_get_consumed_bytes(ArithCoder *c)
yading@10: {
yading@10:     int diff = (c->high >> 16) - (c->low >> 16);
yading@10:     int bp   = bytestream2_tell(c->gbc.gB) - 3 << 3;
yading@10:     int bits = 1;
yading@10: 
yading@10:     while (!(diff & 0x80)) {
yading@10:         bits++;
yading@10:         diff <<= 1;
yading@10:     }
yading@10: 
yading@10:     return (bits + bp + 7 >> 3) + ((c->low >> 16) + 1 == c->high >> 16);
yading@10: }
yading@10: 
yading@10: static void arith2_init(ArithCoder *c, GetByteContext *gB)
yading@10: {
yading@10:     c->low           = 0;
yading@10:     c->high          = 0xFFFFFF;
yading@10:     c->value         = bytestream2_get_be24(gB);
yading@10:     c->gbc.gB        = gB;
yading@10:     c->get_model_sym = arith2_get_model_sym;
yading@10:     c->get_number    = arith2_get_number;
yading@10: }
yading@10: 
yading@10: static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size)
yading@10: {
yading@10:     int i, ncol;
yading@10:     uint32_t *pal = ctx->pal + 256 - ctx->free_colours;
yading@10: 
yading@10:     if (!ctx->free_colours)
yading@10:         return 0;
yading@10: 
yading@10:     ncol = *buf++;
yading@10:     if (ncol > ctx->free_colours || buf_size < 2 + ncol * 3)
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     for (i = 0; i < ncol; i++)
yading@10:         *pal++ = AV_RB24(buf + 3 * i);
yading@10: 
yading@10:     return 1 + ncol * 3;
yading@10: }
yading@10: 
yading@10: static int decode_555(GetByteContext *gB, uint16_t *dst, int stride,
yading@10:                       int keyframe, int w, int h)
yading@10: {
yading@10:     int last_symbol = 0, repeat = 0, prev_avail = 0;
yading@10: 
yading@10:     if (!keyframe) {
yading@10:         int x, y, endx, endy, t;
yading@10: 
yading@10: #define READ_PAIR(a, b)                 \
yading@10:     a  = bytestream2_get_byte(gB) << 4; \
yading@10:     t  = bytestream2_get_byte(gB);      \
yading@10:     a |= t >> 4;                        \
yading@10:     b  = (t & 0xF) << 8;                \
yading@10:     b |= bytestream2_get_byte(gB);      \
yading@10: 
yading@10:         READ_PAIR(x, endx)
yading@10:         READ_PAIR(y, endy)
yading@10: 
yading@10:         if (endx >= w || endy >= h || x > endx || y > endy)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         dst += x + stride * y;
yading@10:         w    = endx - x + 1;
yading@10:         h    = endy - y + 1;
yading@10:         if (y)
yading@10:             prev_avail = 1;
yading@10:     }
yading@10: 
yading@10:     do {
yading@10:         uint16_t *p = dst;
yading@10:         do {
yading@10:             if (repeat-- < 1) {
yading@10:                 int b = bytestream2_get_byte(gB);
yading@10:                 if (b < 128)
yading@10:                     last_symbol = b << 8 | bytestream2_get_byte(gB);
yading@10:                 else if (b > 129) {
yading@10:                     repeat = 0;
yading@10:                     while (b-- > 130)
yading@10:                         repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
yading@10:                     if (last_symbol == -2) {
yading@10:                         int skip = FFMIN((unsigned)repeat, dst + w - p);
yading@10:                         repeat -= skip;
yading@10:                         p      += skip;
yading@10:                     }
yading@10:                 } else
yading@10:                     last_symbol = 127 - b;
yading@10:             }
yading@10:             if (last_symbol >= 0)
yading@10:                 *p = last_symbol;
yading@10:             else if (last_symbol == -1 && prev_avail)
yading@10:                 *p = *(p - stride);
yading@10:         } while (++p < dst + w);
yading@10:         dst       += stride;
yading@10:         prev_avail = 1;
yading@10:     } while (--h);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, int pal_stride,
yading@10:                       uint8_t *rgb_dst, int rgb_stride, uint32_t *pal,
yading@10:                       int keyframe, int kf_slipt, int slice, int w, int h)
yading@10: {
yading@10:     uint8_t bits[270] = { 0 };
yading@10:     uint32_t codes[270];
yading@10:     VLC vlc;
yading@10: 
yading@10:     int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0;
yading@10:     int remaining_codes, surplus_codes, i;
yading@10: 
yading@10:     const int alphabet_size = 270 - keyframe;
yading@10: 
yading@10:     int last_symbol = 0, repeat = 0, prev_avail = 0;
yading@10: 
yading@10:     if (!keyframe) {
yading@10:         int x, y, clipw, cliph;
yading@10: 
yading@10:         x     = get_bits(gb, 12);
yading@10:         y     = get_bits(gb, 12);
yading@10:         clipw = get_bits(gb, 12) + 1;
yading@10:         cliph = get_bits(gb, 12) + 1;
yading@10: 
yading@10:         if (x + clipw > w || y + cliph > h)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         pal_dst += pal_stride * y + x;
yading@10:         rgb_dst += rgb_stride * y + x * 3;
yading@10:         w        = clipw;
yading@10:         h        = cliph;
yading@10:         if (y)
yading@10:             prev_avail = 1;
yading@10:     } else {
yading@10:         if (slice > 0) {
yading@10:             pal_dst   += pal_stride * kf_slipt;
yading@10:             rgb_dst   += rgb_stride * kf_slipt;
yading@10:             prev_avail = 1;
yading@10:             h         -= kf_slipt;
yading@10:         } else
yading@10:             h = kf_slipt;
yading@10:     }
yading@10: 
yading@10:     /* read explicit codes */
yading@10:     do {
yading@10:         while (current_codes--) {
yading@10:             int symbol = get_bits(gb, 8);
yading@10:             if (symbol >= 204 - keyframe)
yading@10:                 symbol += 14 - keyframe;
yading@10:             else if (symbol > 189)
yading@10:                 symbol = get_bits1(gb) + (symbol << 1) - 190;
yading@10:             if (bits[symbol])
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             bits[symbol]  = current_length;
yading@10:             codes[symbol] = next_code++;
yading@10:             read_codes++;
yading@10:         }
yading@10:         current_length++;
yading@10:         next_code     <<= 1;
yading@10:         remaining_codes = (1 << current_length) - next_code;
yading@10:         current_codes   = get_bits(gb, av_ceil_log2(remaining_codes + 1));
yading@10:         if (current_length > 22 || current_codes > remaining_codes)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     } while (current_codes != remaining_codes);
yading@10: 
yading@10:     remaining_codes = alphabet_size - read_codes;
yading@10: 
yading@10:     /* determine the minimum length to fit the rest of the alphabet */
yading@10:     while ((surplus_codes = (2 << current_length) -
yading@10:                             (next_code << 1) - remaining_codes) < 0) {
yading@10:         current_length++;
yading@10:         next_code <<= 1;
yading@10:     }
yading@10: 
yading@10:     /* add the rest of the symbols lexicographically */
yading@10:     for (i = 0; i < alphabet_size; i++)
yading@10:         if (!bits[i]) {
yading@10:             if (surplus_codes-- == 0) {
yading@10:                 current_length++;
yading@10:                 next_code <<= 1;
yading@10:             }
yading@10:             bits[i]  = current_length;
yading@10:             codes[i] = next_code++;
yading@10:         }
yading@10: 
yading@10:     if (next_code != 1 << current_length)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     if (i = init_vlc(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0))
yading@10:         return i;
yading@10: 
yading@10:     /* frame decode */
yading@10:     do {
yading@10:         uint8_t *pp = pal_dst;
yading@10:         uint8_t *rp = rgb_dst;
yading@10:         do {
yading@10:             if (repeat-- < 1) {
yading@10:                 int b = get_vlc2(gb, vlc.table, 9, 3);
yading@10:                 if (b < 256)
yading@10:                     last_symbol = b;
yading@10:                 else if (b < 268) {
yading@10:                     b -= 256;
yading@10:                     if (b == 11)
yading@10:                         b = get_bits(gb, 4) + 10;
yading@10: 
yading@10:                     if (!b)
yading@10:                         repeat = 0;
yading@10:                     else
yading@10:                         repeat = get_bits(gb, b);
yading@10: 
yading@10:                     repeat += (1 << b) - 1;
yading@10: 
yading@10:                     if (last_symbol == -2) {
yading@10:                         int skip = FFMIN(repeat, pal_dst + w - pp);
yading@10:                         repeat -= skip;
yading@10:                         pp     += skip;
yading@10:                         rp     += skip * 3;
yading@10:                     }
yading@10:                 } else
yading@10:                     last_symbol = 267 - b;
yading@10:             }
yading@10:             if (last_symbol >= 0) {
yading@10:                 *pp = last_symbol;
yading@10:                 AV_WB24(rp, pal[last_symbol]);
yading@10:             } else if (last_symbol == -1 && prev_avail) {
yading@10:                 *pp = *(pp - pal_stride);
yading@10:                 memcpy(rp, rp - rgb_stride, 3);
yading@10:             }
yading@10:             rp += 3;
yading@10:         } while (++pp < pal_dst + w);
yading@10:         pal_dst   += pal_stride;
yading@10:         rgb_dst   += rgb_stride;
yading@10:         prev_avail = 1;
yading@10:     } while (--h);
yading@10: 
yading@10:     ff_free_vlc(&vlc);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
yading@10:                        int x, int y, int w, int h, int wmv9_mask)
yading@10: {
yading@10:     MSS2Context *ctx  = avctx->priv_data;
yading@10:     MSS12Context *c   = &ctx->c;
yading@10:     VC1Context *v     = avctx->priv_data;
yading@10:     MpegEncContext *s = &v->s;
yading@10:     AVFrame *f;
yading@10:     int ret;
yading@10: 
yading@10:     ff_mpeg_flush(avctx);
yading@10: 
yading@10:     if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
yading@10:         int i = ff_find_unused_picture(s, 0);
yading@10:         if (i < 0)
yading@10:             return i;
yading@10:         s->current_picture_ptr = &s->picture[i];
yading@10:     }
yading@10: 
yading@10:     init_get_bits(&s->gb, buf, buf_size * 8);
yading@10: 
yading@10:     s->loop_filter = avctx->skip_loop_filter < AVDISCARD_ALL;
yading@10: 
yading@10:     if (ff_vc1_parse_frame_header(v, &s->gb) == -1) {
yading@10:         av_log(v->s.avctx, AV_LOG_ERROR, "header error\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (s->pict_type != AV_PICTURE_TYPE_I) {
yading@10:         av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
yading@10: 
yading@10:     if ((ret = ff_MPV_frame_start(s, avctx)) < 0) {
yading@10:         av_log(v->s.avctx, AV_LOG_ERROR, "ff_MPV_frame_start error\n");
yading@10:         avctx->pix_fmt = AV_PIX_FMT_RGB24;
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     ff_mpeg_er_frame_start(s);
yading@10: 
yading@10:     v->bits = buf_size * 8;
yading@10: 
yading@10:     v->end_mb_x = (w + 15) >> 4;
yading@10:     s->end_mb_y = (h + 15) >> 4;
yading@10:     if (v->respic & 1)
yading@10:         v->end_mb_x = v->end_mb_x + 1 >> 1;
yading@10:     if (v->respic & 2)
yading@10:         s->end_mb_y = s->end_mb_y + 1 >> 1;
yading@10: 
yading@10:     ff_vc1_decode_blocks(v);
yading@10: 
yading@10:     ff_er_frame_end(&s->er);
yading@10: 
yading@10:     ff_MPV_frame_end(s);
yading@10: 
yading@10:     f = &s->current_picture.f;
yading@10: 
yading@10:     if (v->respic == 3) {
yading@10:         ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w,      h);
yading@10:         ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w >> 1, h >> 1);
yading@10:         ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w >> 1, h >> 1);
yading@10:     } else if (v->respic)
yading@10:         avpriv_request_sample(v->s.avctx,
yading@10:                               "Asymmetric WMV9 rectangle subsampling");
yading@10: 
yading@10:     av_assert0(f->linesize[1] == f->linesize[2]);
yading@10: 
yading@10:     if (wmv9_mask != -1)
yading@10:         ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3,
yading@10:                                        c->rgb_stride, wmv9_mask,
yading@10:                                        c->pal_pic + y * c->pal_stride + x,
yading@10:                                        c->pal_stride,
yading@10:                                        f->data[0], f->linesize[0],
yading@10:                                        f->data[1], f->data[2], f->linesize[1],
yading@10:                                        w, h);
yading@10:     else
yading@10:         ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3,
yading@10:                                 c->rgb_stride,
yading@10:                                 f->data[0], f->linesize[0],
yading@10:                                 f->data[1], f->data[2], f->linesize[1],
yading@10:                                 w, h);
yading@10: 
yading@10:     avctx->pix_fmt = AV_PIX_FMT_RGB24;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: typedef struct Rectangle {
yading@10:     int coded, x, y, w, h;
yading@10: } Rectangle;
yading@10: 
yading@10: #define MAX_WMV9_RECTANGLES 20
yading@10: #define ARITH2_PADDING 2
yading@10: 
yading@10: static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
yading@10:                              AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size       = avpkt->size;
yading@10:     MSS2Context *ctx = avctx->priv_data;
yading@10:     MSS12Context *c  = &ctx->c;
yading@10:     AVFrame *frame   = data;
yading@10:     GetBitContext gb;
yading@10:     GetByteContext gB;
yading@10:     ArithCoder acoder;
yading@10: 
yading@10:     int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
yading@10: 
yading@10:     Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
yading@10:     int used_rects = 0, i, implicit_rect = 0, av_uninit(wmv9_mask);
yading@10: 
yading@10:     av_assert0(FF_INPUT_BUFFER_PADDING_SIZE >=
yading@10:                ARITH2_PADDING + (MIN_CACHE_BITS + 7) / 8);
yading@10: 
yading@10:     init_get_bits(&gb, buf, buf_size * 8);
yading@10: 
yading@10:     if (keyframe = get_bits1(&gb))
yading@10:         skip_bits(&gb, 7);
yading@10:     has_wmv9 = get_bits1(&gb);
yading@10:     has_mv   = keyframe ? 0 : get_bits1(&gb);
yading@10:     is_rle   = get_bits1(&gb);
yading@10:     is_555   = is_rle && get_bits1(&gb);
yading@10:     if (c->slice_split > 0)
yading@10:         ctx->split_position = c->slice_split;
yading@10:     else if (c->slice_split < 0) {
yading@10:         if (get_bits1(&gb)) {
yading@10:             if (get_bits1(&gb)) {
yading@10:                 if (get_bits1(&gb))
yading@10:                     ctx->split_position = get_bits(&gb, 16);
yading@10:                 else
yading@10:                     ctx->split_position = get_bits(&gb, 12);
yading@10:             } else
yading@10:                 ctx->split_position = get_bits(&gb, 8) << 4;
yading@10:         } else {
yading@10:             if (keyframe)
yading@10:                 ctx->split_position = avctx->height / 2;
yading@10:         }
yading@10:     } else
yading@10:         ctx->split_position = avctx->height;
yading@10: 
yading@10:     if (c->slice_split && (ctx->split_position < 1 - is_555 ||
yading@10:                            ctx->split_position > avctx->height - 1))
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     align_get_bits(&gb);
yading@10:     buf      += get_bits_count(&gb) >> 3;
yading@10:     buf_size -= get_bits_count(&gb) >> 3;
yading@10: 
yading@10:     if (buf_size < 1)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position))
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     avctx->pix_fmt = is_555 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_RGB24;
yading@10:     if (ctx->last_pic.format != avctx->pix_fmt)
yading@10:         av_frame_unref(&ctx->last_pic);
yading@10: 
yading@10:     if (has_wmv9) {
yading@10:         bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
yading@10:         arith2_init(&acoder, &gB);
yading@10: 
yading@10:         implicit_rect = !arith2_get_bit(&acoder);
yading@10: 
yading@10:         while (arith2_get_bit(&acoder)) {
yading@10:             if (used_rects == MAX_WMV9_RECTANGLES)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             r = &wmv9rects[used_rects];
yading@10:             if (!used_rects)
yading@10:                 r->x = arith2_get_number(&acoder, avctx->width);
yading@10:             else
yading@10:                 r->x = arith2_get_number(&acoder, avctx->width -
yading@10:                                          wmv9rects[used_rects - 1].x) +
yading@10:                        wmv9rects[used_rects - 1].x;
yading@10:             r->y = arith2_get_number(&acoder, avctx->height);
yading@10:             r->w = arith2_get_number(&acoder, avctx->width  - r->x) + 1;
yading@10:             r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1;
yading@10:             used_rects++;
yading@10:         }
yading@10: 
yading@10:         if (implicit_rect && used_rects) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10: 
yading@10:         if (implicit_rect) {
yading@10:             wmv9rects[0].x = 0;
yading@10:             wmv9rects[0].y = 0;
yading@10:             wmv9rects[0].w = avctx->width;
yading@10:             wmv9rects[0].h = avctx->height;
yading@10: 
yading@10:             used_rects = 1;
yading@10:         }
yading@10:         for (i = 0; i < used_rects; i++) {
yading@10:             if (!implicit_rect && arith2_get_bit(&acoder)) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:             if (!i) {
yading@10:                 wmv9_mask = arith2_get_bit(&acoder) - 1;
yading@10:                 if (!wmv9_mask)
yading@10:                     wmv9_mask = arith2_get_number(&acoder, 256);
yading@10:             }
yading@10:             wmv9rects[i].coded = arith2_get_number(&acoder, 2);
yading@10:         }
yading@10: 
yading@10:         buf      += arith2_get_consumed_bytes(&acoder);
yading@10:         buf_size -= arith2_get_consumed_bytes(&acoder);
yading@10:         if (buf_size < 1)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     c->mvX = c->mvY = 0;
yading@10:     if (keyframe && !is_555) {
yading@10:         if ((i = decode_pal_v2(c, buf, buf_size)) < 0)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         buf      += i;
yading@10:         buf_size -= i;
yading@10:     } else if (has_mv) {
yading@10:         buf      += 4;
yading@10:         buf_size -= 4;
yading@10:         if (buf_size < 1)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         c->mvX = AV_RB16(buf - 4) - avctx->width;
yading@10:         c->mvY = AV_RB16(buf - 2) - avctx->height;
yading@10:     }
yading@10: 
yading@10:     if (c->mvX < 0 || c->mvY < 0) {
yading@10:         FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic);
yading@10: 
yading@10:         if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:         if (ctx->last_pic.data[0]) {
yading@10:             av_assert0(frame->linesize[0] == ctx->last_pic.linesize[0]);
yading@10:             c->last_rgb_pic = ctx->last_pic.data[0] +
yading@10:                               ctx->last_pic.linesize[0] * (avctx->height - 1);
yading@10:         } else {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     } else {
yading@10:         if ((ret = ff_reget_buffer(avctx, &ctx->last_pic)) < 0)
yading@10:             return ret;
yading@10:         if ((ret = av_frame_ref(frame, &ctx->last_pic)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:         c->last_rgb_pic = NULL;
yading@10:     }
yading@10:     c->rgb_pic    = frame->data[0] +
yading@10:                     frame->linesize[0] * (avctx->height - 1);
yading@10:     c->rgb_stride = -frame->linesize[0];
yading@10: 
yading@10:     frame->key_frame = keyframe;
yading@10:     frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
yading@10: 
yading@10:     if (is_555) {
yading@10:         bytestream2_init(&gB, buf, buf_size);
yading@10: 
yading@10:         if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1,
yading@10:                        keyframe, avctx->width, avctx->height))
yading@10:             return AVERROR_INVALIDDATA;
yading@10: 
yading@10:         buf_size -= bytestream2_tell(&gB);
yading@10:     } else {
yading@10:         if (keyframe) {
yading@10:             c->corrupted = 0;
yading@10:             ff_mss12_slicecontext_reset(&ctx->sc[0]);
yading@10:             if (c->slice_split)
yading@10:                 ff_mss12_slicecontext_reset(&ctx->sc[1]);
yading@10:         }
yading@10:         if (is_rle) {
yading@10:             init_get_bits(&gb, buf, buf_size * 8);
yading@10:             if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
yading@10:                                  c->rgb_pic, c->rgb_stride, c->pal, keyframe,
yading@10:                                  ctx->split_position, 0,
yading@10:                                  avctx->width, avctx->height))
yading@10:                 return ret;
yading@10:             align_get_bits(&gb);
yading@10: 
yading@10:             if (c->slice_split)
yading@10:                 if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride,
yading@10:                                      c->rgb_pic, c->rgb_stride, c->pal, keyframe,
yading@10:                                      ctx->split_position, 1,
yading@10:                                      avctx->width, avctx->height))
yading@10:                     return ret;
yading@10: 
yading@10:             align_get_bits(&gb);
yading@10:             buf      += get_bits_count(&gb) >> 3;
yading@10:             buf_size -= get_bits_count(&gb) >> 3;
yading@10:         } else if (!implicit_rect || wmv9_mask != -1) {
yading@10:             if (c->corrupted)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
yading@10:             arith2_init(&acoder, &gB);
yading@10:             c->keyframe = keyframe;
yading@10:             if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[0], &acoder, 0, 0,
yading@10:                                                     avctx->width,
yading@10:                                                     ctx->split_position))
yading@10:                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:             buf      += arith2_get_consumed_bytes(&acoder);
yading@10:             buf_size -= arith2_get_consumed_bytes(&acoder);
yading@10:             if (c->slice_split) {
yading@10:                 if (buf_size < 1)
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING);
yading@10:                 arith2_init(&acoder, &gB);
yading@10:                 if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[1], &acoder, 0,
yading@10:                                                         ctx->split_position,
yading@10:                                                         avctx->width,
yading@10:                                                         avctx->height - ctx->split_position))
yading@10:                     return AVERROR_INVALIDDATA;
yading@10: 
yading@10:                 buf      += arith2_get_consumed_bytes(&acoder);
yading@10:                 buf_size -= arith2_get_consumed_bytes(&acoder);
yading@10:             }
yading@10:         } else
yading@10:             memset(c->pal_pic, 0, c->pal_stride * avctx->height);
yading@10:     }
yading@10: 
yading@10:     if (has_wmv9) {
yading@10:         for (i = 0; i < used_rects; i++) {
yading@10:             int x = wmv9rects[i].x;
yading@10:             int y = wmv9rects[i].y;
yading@10:             int w = wmv9rects[i].w;
yading@10:             int h = wmv9rects[i].h;
yading@10:             if (wmv9rects[i].coded) {
yading@10:                 int WMV9codedFrameSize;
yading@10:                 if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf)))
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3,
yading@10:                                       x, y, w, h, wmv9_mask))
yading@10:                     return ret;
yading@10:                 buf      += WMV9codedFrameSize + 3;
yading@10:                 buf_size -= WMV9codedFrameSize + 3;
yading@10:             } else {
yading@10:                 uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3;
yading@10:                 if (wmv9_mask != -1) {
yading@10:                     ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride,
yading@10:                                                    wmv9_mask,
yading@10:                                                    c->pal_pic + y * c->pal_stride + x,
yading@10:                                                    c->pal_stride,
yading@10:                                                    w, h);
yading@10:                 } else {
yading@10:                     do {
yading@10:                         memset(dst, 0x80, w * 3);
yading@10:                         dst += c->rgb_stride;
yading@10:                     } while (--h);
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (buf_size)
yading@10:         av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n");
yading@10: 
yading@10:     if (c->mvX < 0 || c->mvY < 0) {
yading@10:         av_frame_unref(&ctx->last_pic);
yading@10:         ret = av_frame_ref(&ctx->last_pic, frame);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:     }
yading@10: 
yading@10:     *got_frame       = 1;
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: static av_cold int wmv9_init(AVCodecContext *avctx)
yading@10: {
yading@10:     VC1Context *v = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     v->s.avctx    = avctx;
yading@10:     avctx->flags |= CODEC_FLAG_EMU_EDGE;
yading@10:     v->s.flags   |= CODEC_FLAG_EMU_EDGE;
yading@10: 
yading@10:     if ((ret = ff_vc1_init_common(v)) < 0)
yading@10:         return ret;
yading@10:     ff_vc1dsp_init(&v->vc1dsp);
yading@10: 
yading@10:     v->profile = PROFILE_MAIN;
yading@10: 
yading@10:     v->zz_8x4     = ff_wmv2_scantableA;
yading@10:     v->zz_4x8     = ff_wmv2_scantableB;
yading@10:     v->res_y411   = 0;
yading@10:     v->res_sprite = 0;
yading@10: 
yading@10:     v->frmrtq_postproc = 7;
yading@10:     v->bitrtq_postproc = 31;
yading@10: 
yading@10:     v->res_x8          = 0;
yading@10:     v->multires        = 0;
yading@10:     v->res_fasttx      = 1;
yading@10: 
yading@10:     v->fastuvmc        = 0;
yading@10: 
yading@10:     v->extended_mv     = 0;
yading@10: 
yading@10:     v->dquant          = 1;
yading@10:     v->vstransform     = 1;
yading@10: 
yading@10:     v->res_transtab    = 0;
yading@10: 
yading@10:     v->overlap         = 0;
yading@10: 
yading@10:     v->s.resync_marker = 0;
yading@10:     v->rangered        = 0;
yading@10: 
yading@10:     v->s.max_b_frames = avctx->max_b_frames = 0;
yading@10:     v->quantizer_mode = 0;
yading@10: 
yading@10:     v->finterpflag = 0;
yading@10: 
yading@10:     v->res_rtm_flag = 1;
yading@10: 
yading@10:     ff_vc1_init_transposed_scantables(v);
yading@10: 
yading@10:     if ((ret = ff_msmpeg4_decode_init(avctx)) < 0 ||
yading@10:         (ret = ff_vc1_decode_init_alloc_tables(v)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     /* error concealment */
yading@10:     v->s.me.qpel_put = v->s.dsp.put_qpel_pixels_tab;
yading@10:     v->s.me.qpel_avg = v->s.dsp.avg_qpel_pixels_tab;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int mss2_decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     MSS2Context *const ctx = avctx->priv_data;
yading@10: 
yading@10:     av_frame_unref(&ctx->last_pic);
yading@10: 
yading@10:     ff_mss12_decode_end(&ctx->c);
yading@10:     av_freep(&ctx->c.pal_pic);
yading@10:     av_freep(&ctx->c.last_pal_pic);
yading@10:     ff_vc1_decode_end(avctx);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int mss2_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     MSS2Context * const ctx = avctx->priv_data;
yading@10:     MSS12Context *c = &ctx->c;
yading@10:     int ret;
yading@10:     c->avctx = avctx;
yading@10:     if (ret = ff_mss12_decode_init(c, 1, &ctx->sc[0], &ctx->sc[1]))
yading@10:         return ret;
yading@10:     c->pal_stride   = c->mask_stride;
yading@10:     c->pal_pic      = av_mallocz(c->pal_stride * avctx->height);
yading@10:     c->last_pal_pic = av_mallocz(c->pal_stride * avctx->height);
yading@10:     if (!c->pal_pic || !c->last_pal_pic) {
yading@10:         mss2_decode_end(avctx);
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10:     if (ret = wmv9_init(avctx)) {
yading@10:         mss2_decode_end(avctx);
yading@10:         return ret;
yading@10:     }
yading@10:     ff_mss2dsp_init(&ctx->dsp);
yading@10: 
yading@10:     avctx->pix_fmt = c->free_colours == 127 ? AV_PIX_FMT_RGB555
yading@10:                                             : AV_PIX_FMT_RGB24;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_mss2_decoder = {
yading@10:     .name           = "mss2",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_MSS2,
yading@10:     .priv_data_size = sizeof(MSS2Context),
yading@10:     .init           = mss2_decode_init,
yading@10:     .close          = mss2_decode_end,
yading@10:     .decode         = mss2_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("MS Windows Media Video V9 Screen"),
yading@10: };