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