From ee769c6a7c1d4ec6560f5e5a6f457b770b10fb33 Mon Sep 17 00:00:00 2001 From: Alberto Delmás Date: Fri, 24 Aug 2012 17:45:57 +0200 Subject: MSS2 decoder Signed-off-by: Kostya Shishkov --- libavcodec/mss2.c | 860 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 860 insertions(+) create mode 100644 libavcodec/mss2.c (limited to 'libavcodec/mss2.c') diff --git a/libavcodec/mss2.c b/libavcodec/mss2.c new file mode 100644 index 0000000000..c0c47dc8d3 --- /dev/null +++ b/libavcodec/mss2.c @@ -0,0 +1,860 @@ +/* + * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder + */ + +#include "libavutil/avassert.h" +#include "msmpeg4data.h" +#include "vc1.h" +#include "mss12.h" +#include "mss2dsp.h" + +typedef struct MSS2Context { + VC1Context v; + int split_position; + AVFrame pic; + AVFrame last_pic; + MSS12Context c; + MSS2DSPContext dsp; + SliceContext sc[2]; +} MSS2Context; + +static void arith2_normalise(ArithCoder *c) +{ + while ((c->high >> 15) - (c->low >> 15) < 2) { + if ((c->low ^ c->high) & 0x10000) { + c->high ^= 0x8000; + c->value ^= 0x8000; + c->low ^= 0x8000; + } + c->high = c->high << 8 & 0xFFFFFF | 0xFF; + c->value = c->value << 8 & 0xFFFFFF | bytestream2_get_byte(c->gbc.gB); + c->low = c->low << 8 & 0xFFFFFF; + } +} + +ARITH_GET_BIT(2) + +/* L. Stuiver and A. Moffat: "Piecewise Integer Mapping for Arithmetic Coding." + * In Proc. 8th Data Compression Conference (DCC '98), pp. 3-12, Mar. 1998 */ + +static int arith2_get_scaled_value(int value, int n, int range) +{ + int split = (n << 1) - range; + + if (value > split) + return split + (value - split >> 1); + else + return value; +} + +static void arith2_rescale_interval(ArithCoder *c, int range, + int low, int high, int n) +{ + int split = (n << 1) - range; + + if (high > split) + c->high = split + (high - split << 1); + else + c->high = high; + + c->high += c->low - 1; + + if (low > split) + c->low += split + (low - split << 1); + else + c->low += low; +} + +static int arith2_get_number(ArithCoder *c, int n) +{ + int range = c->high - c->low + 1; + int scale = av_log2(range) - av_log2(n); + int val; + + if (n << scale > range) + scale--; + + n <<= scale; + + val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale; + + arith2_rescale_interval(c, range, val << scale, (val + 1) << scale, n); + + arith2_normalise(c); + + return val; +} + +static int arith2_get_prob(ArithCoder *c, int *probs) +{ + int range = c->high - c->low + 1, n = *probs; + int scale = av_log2(range) - av_log2(n); + int i = 0, val; + + if (n << scale > range) + scale--; + + n <<= scale; + + val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale; + while (probs[++i] > val) ; + + arith2_rescale_interval(c, range, + probs[i] << scale, probs[i - 1] << scale, n); + + return i; +} + +ARITH_GET_MODEL_SYM(2) + +static int arith2_get_consumed_bytes(ArithCoder *c) +{ + int diff = (c->high >> 16) - (c->low >> 16); + int bp = bytestream2_tell(c->gbc.gB) - 3 << 3; + int bits = 1; + + while (!(diff & 0x80)) { + bits++; + diff <<= 1; + } + + return (bits + bp + 7 >> 3) + ((c->low >> 16) + 1 == c->high >> 16); +} + +static void arith2_init(ArithCoder *c, GetByteContext *gB) +{ + c->low = 0; + c->high = 0xFFFFFF; + c->value = bytestream2_get_be24(gB); + c->gbc.gB = gB; + c->get_model_sym = arith2_get_model_sym; + c->get_number = arith2_get_number; +} + +static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size) +{ + int i, ncol; + uint32_t *pal = ctx->pal + 256 - ctx->free_colours; + + if (!ctx->free_colours) + return 0; + + ncol = *buf++; + if (buf_size < 2 + ncol * 3) + return -1; + for (i = 0; i < ncol; i++) + *pal++ = AV_RB24(buf + 3 * i); + + return 1 + ncol * 3; +} + +static int decode_555(GetByteContext *gB, uint16_t *dst, int stride, + int keyframe, int w, int h) +{ + int last_symbol = 0, repeat = 0, prev_avail = 0; + + if (!keyframe) { + int x, y, endx, endy, t; + +#define READ_PAIR(a, b) \ + a = bytestream2_get_byte(gB) << 4; \ + t = bytestream2_get_byte(gB); \ + a |= t >> 4; \ + b = (t & 0xF) << 8; \ + b |= bytestream2_get_byte(gB); \ + + READ_PAIR(x, endx) + READ_PAIR(y, endy) + + if (endx >= w || endy >= h || x > endx || y > endy) + return -1; + dst += x + stride * y; + w = endx - x + 1; + h = endy - y + 1; + if (y) + prev_avail = 1; + } + + do { + uint16_t *p = dst; + do { + if (repeat-- < 1) { + int b = bytestream2_get_byte(gB); + if (b < 128) + last_symbol = b << 8 | bytestream2_get_byte(gB); + else if (b > 129) { + repeat = 0; + while (b-- > 130) + repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1; + if (last_symbol == -2) { + int skip = FFMIN((unsigned)repeat, dst + w - p); + repeat -= skip; + p += skip; + } + } else + last_symbol = 127 - b; + } + if (last_symbol >= 0) + *p = last_symbol; + else if (last_symbol == -1 && prev_avail) + *p = *(p - stride); + } while (++p < dst + w); + dst += stride; + prev_avail = 1; + } while (--h); + + return 0; +} + +static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, int pal_stride, + uint8_t *rgb_dst, int rgb_stride, uint32_t *pal, + int keyframe, int kf_slipt, int slice, int w, int h) +{ + uint8_t bits[270] = { 0 }; + uint32_t codes[270]; + VLC vlc; + + int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0; + int remaining_codes, surplus_codes, i; + + const int alphabet_size = 270 - keyframe; + + int last_symbol = 0, repeat = 0, prev_avail = 0; + + if (!keyframe) { + int x, y, clipw, cliph; + + x = get_bits(gb, 12); + y = get_bits(gb, 12); + clipw = get_bits(gb, 12) + 1; + cliph = get_bits(gb, 12) + 1; + + if (x + clipw > w || y + cliph > h) + return AVERROR_INVALIDDATA; + pal_dst += pal_stride * y + x; + rgb_dst += rgb_stride * y + x * 3; + w = clipw; + h = cliph; + if (y) + prev_avail = 1; + } else { + if (slice > 0) { + pal_dst += pal_stride * kf_slipt; + rgb_dst += rgb_stride * kf_slipt; + prev_avail = 1; + h -= kf_slipt; + } else + h = kf_slipt; + } + + /* read explicit codes */ + do { + while (current_codes--) { + int symbol = get_bits(gb, 8); + if (symbol >= 204 - keyframe) + symbol += 14 - keyframe; + else if (symbol > 189) + symbol = get_bits1(gb) + (symbol << 1) - 190; + if (bits[symbol]) + return AVERROR_INVALIDDATA; + bits[symbol] = current_length; + codes[symbol] = next_code++; + read_codes++; + } + current_length++; + next_code <<= 1; + remaining_codes = (1 << current_length) - next_code; + current_codes = get_bits(gb, av_ceil_log2(remaining_codes + 1)); + if (current_length > 22 || current_codes > remaining_codes) + return AVERROR_INVALIDDATA; + } while (current_codes != remaining_codes); + + remaining_codes = alphabet_size - read_codes; + + /* determine the minimum length to fit the rest of the alphabet */ + while ((surplus_codes = (2 << current_length) - + (next_code << 1) - remaining_codes) < 0) { + current_length++; + next_code <<= 1; + } + + /* add the rest of the symbols lexicographically */ + for (i = 0; i < alphabet_size; i++) + if (!bits[i]) { + if (surplus_codes-- == 0) { + current_length++; + next_code <<= 1; + } + bits[i] = current_length; + codes[i] = next_code++; + } + + if (next_code != 1 << current_length) + return AVERROR_INVALIDDATA; + + if (i = init_vlc(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0)) + return i; + + /* frame decode */ + do { + uint8_t *pp = pal_dst; + uint8_t *rp = rgb_dst; + do { + if (repeat-- < 1) { + int b = get_vlc2(gb, vlc.table, 9, 3); + if (b < 256) + last_symbol = b; + else if (b < 268) { + b -= 256; + if (b == 11) + b = get_bits(gb, 4) + 10; + + if (!b) + repeat = 0; + else + repeat = get_bits(gb, b); + + while (b--) + repeat += 1 << b; + + if (last_symbol == -2) { + int skip = FFMIN(repeat, pal_dst + w - pp); + repeat -= skip; + pp += skip; + rp += skip * 3; + } + } else + last_symbol = 267 - b; + } + if (last_symbol >= 0) { + *pp = last_symbol; + AV_WB24(rp, pal[last_symbol]); + } else if (last_symbol == -1 && prev_avail) { + *pp = *(pp - pal_stride); + memcpy(rp, rp - rgb_stride, 3); + } + rp += 3; + } while (++pp < pal_dst + w); + pal_dst += pal_stride; + rgb_dst += rgb_stride; + prev_avail = 1; + } while (--h); + + ff_free_vlc(&vlc); + return 0; +} + +static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size, + int x, int y, int w, int h, int wmv9_mask) +{ + MSS2Context *ctx = avctx->priv_data; + MSS12Context *c = &ctx->c; + VC1Context *v = avctx->priv_data; + MpegEncContext *s = &v->s; + AVFrame *f; + + ff_mpeg_flush(avctx); + + if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) { + int i = ff_find_unused_picture(s, 0); + if (i < 0) + return -1; + s->current_picture_ptr = &s->picture[i]; + } + + init_get_bits(&s->gb, buf, buf_size * 8); + + s->loop_filter = avctx->skip_loop_filter < AVDISCARD_ALL; + + if (ff_vc1_parse_frame_header(v, &s->gb) == -1) { + av_log(v->s.avctx, AV_LOG_ERROR, "header error\n"); + return AVERROR_INVALIDDATA; + } + + if (s->pict_type != AV_PICTURE_TYPE_I) { + av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n"); + return AVERROR_INVALIDDATA; + } + + avctx->pix_fmt = PIX_FMT_YUV420P; + + if (ff_MPV_frame_start(s, avctx) < 0) { + av_log(v->s.avctx, AV_LOG_ERROR, "ff_MPV_frame_start error\n"); + avctx->pix_fmt = PIX_FMT_RGB24; + return -1; + } + + ff_er_frame_start(s); + + v->bits = buf_size * 8; + + v->end_mb_x = (w + 15) >> 4; + s->end_mb_y = (h + 15) >> 4; + if (v->respic & 1) + v->end_mb_x = v->end_mb_x + 1 >> 1; + if (v->respic & 2) + s->end_mb_y = s->end_mb_y + 1 >> 1; + + ff_vc1_decode_blocks(v); + + ff_er_frame_end(s); + + ff_MPV_frame_end(s); + + f = &s->current_picture.f; + + if (v->respic == 3) { + ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h); + ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w >> 1, h >> 1); + ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w >> 1, h >> 1); + } else if (v->respic) + av_log_ask_for_sample(v->s.avctx, + "Asymmetric WMV9 rectangle subsampling\n"); + + av_assert0(f->linesize[1] == f->linesize[2]); + + if (wmv9_mask != -1) + ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3, + c->rgb_stride, wmv9_mask, + c->pal_pic + y * c->pal_stride + x, + c->pal_stride, + f->data[0], f->linesize[0], + f->data[1], f->data[2], f->linesize[1], + w, h); + else + ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3, + c->rgb_stride, + f->data[0], f->linesize[0], + f->data[1], f->data[2], f->linesize[1], + w, h); + + avctx->pix_fmt = PIX_FMT_RGB24; + + return 0; +} + +typedef struct Rectangle { + int coded, x, y, w, h; +} Rectangle; + +#define MAX_WMV9_RECTANGLES 20 +#define ARITH2_PADDING 2 + +static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *data_size, + AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + MSS2Context *ctx = avctx->priv_data; + MSS12Context *c = &ctx->c; + GetBitContext gb; + GetByteContext gB; + ArithCoder acoder; + + int keyframe, has_wmv9, has_mv, is_rle, is_555, ret; + + Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r; + int used_rects = 0, i, implicit_rect, av_uninit(wmv9_mask); + + av_assert0(FF_INPUT_BUFFER_PADDING_SIZE >= + ARITH2_PADDING + (MIN_CACHE_BITS + 7) / 8); + + init_get_bits(&gb, buf, buf_size * 8); + + if (keyframe = get_bits1(&gb)) + skip_bits(&gb, 7); + has_wmv9 = get_bits1(&gb); + has_mv = keyframe ? 0 : get_bits1(&gb); + is_rle = get_bits1(&gb); + is_555 = is_rle && get_bits1(&gb); + if (c->slice_split > 0) + ctx->split_position = c->slice_split; + else if (c->slice_split < 0) { + if (get_bits1(&gb)) { + if (get_bits1(&gb)) { + if (get_bits1(&gb)) + ctx->split_position = get_bits(&gb, 16); + else + ctx->split_position = get_bits(&gb, 12); + } else + ctx->split_position = get_bits(&gb, 8) << 4; + } else { + if (keyframe) + ctx->split_position = avctx->height / 2; + } + } else + ctx->split_position = avctx->height; + + if (c->slice_split && (ctx->split_position < 1 - is_555 || + ctx->split_position > avctx->height - 1)) + return AVERROR_INVALIDDATA; + + align_get_bits(&gb); + buf += get_bits_count(&gb) >> 3; + buf_size -= get_bits_count(&gb) >> 3; + + if (buf_size < 1) + return AVERROR_INVALIDDATA; + + if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position)) + return AVERROR_INVALIDDATA; + + avctx->pix_fmt = is_555 ? PIX_FMT_RGB555 : PIX_FMT_RGB24; + if (ctx->pic.data[0] && ctx->pic.format != avctx->pix_fmt) + avctx->release_buffer(avctx, &ctx->pic); + + if (has_wmv9) { + bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING); + arith2_init(&acoder, &gB); + + implicit_rect = !arith2_get_bit(&acoder); + + while (arith2_get_bit(&acoder)) { + if (used_rects == MAX_WMV9_RECTANGLES) + return AVERROR_INVALIDDATA; + r = &wmv9rects[used_rects]; + if (!used_rects) + r->x = arith2_get_number(&acoder, avctx->width); + else + r->x = arith2_get_number(&acoder, avctx->width - + wmv9rects[used_rects - 1].x) + + wmv9rects[used_rects - 1].x; + r->y = arith2_get_number(&acoder, avctx->height); + r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1; + r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1; + used_rects++; + } + + if (implicit_rect && used_rects) { + av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n"); + return AVERROR_INVALIDDATA; + } + + if (implicit_rect) { + wmv9rects[0].x = 0; + wmv9rects[0].y = 0; + wmv9rects[0].w = avctx->width; + wmv9rects[0].h = avctx->height; + + used_rects = 1; + } + for (i = 0; i < used_rects; i++) { + if (!implicit_rect && arith2_get_bit(&acoder)) { + av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n"); + return AVERROR_INVALIDDATA; + } + if (!i) { + wmv9_mask = arith2_get_bit(&acoder) - 1; + if (!wmv9_mask) + wmv9_mask = arith2_get_number(&acoder, 256); + } + wmv9rects[i].coded = arith2_get_number(&acoder, 2); + } + + buf += arith2_get_consumed_bytes(&acoder); + buf_size -= arith2_get_consumed_bytes(&acoder); + if (buf_size < 1) + return AVERROR_INVALIDDATA; + } + + c->mvX = c->mvY = 0; + if (keyframe && !is_555) { + if ((i = decode_pal_v2(c, buf, buf_size)) < 0) + return AVERROR_INVALIDDATA; + buf += i; + buf_size -= i; + } else if (has_mv) { + buf += 4; + buf_size -= 4; + if (buf_size < 1) + return AVERROR_INVALIDDATA; + c->mvX = AV_RB16(buf - 4) - avctx->width; + c->mvY = AV_RB16(buf - 2) - avctx->height; + } + + if (c->mvX < 0 || c->mvY < 0) { + FFSWAP(AVFrame, ctx->pic, ctx->last_pic); + FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic); + + if (ctx->pic.data[0]) + avctx->release_buffer(avctx, &ctx->pic); + + ctx->pic.reference = 3; + ctx->pic.buffer_hints = FF_BUFFER_HINTS_VALID | + FF_BUFFER_HINTS_READABLE | + FF_BUFFER_HINTS_PRESERVE | + FF_BUFFER_HINTS_REUSABLE; + + if ((ret = avctx->get_buffer(avctx, &ctx->pic)) < 0) { + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return ret; + } + + if (ctx->last_pic.data[0]) { + av_assert0(ctx->pic.linesize[0] == ctx->last_pic.linesize[0]); + c->last_rgb_pic = ctx->last_pic.data[0] + + ctx->last_pic.linesize[0] * (avctx->height - 1); + } else { + av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n"); + return -1; + } + } else { + if (ctx->last_pic.data[0]) + avctx->release_buffer(avctx, &ctx->last_pic); + + ctx->pic.reference = 3; + ctx->pic.buffer_hints = FF_BUFFER_HINTS_VALID | + FF_BUFFER_HINTS_READABLE | + FF_BUFFER_HINTS_PRESERVE | + FF_BUFFER_HINTS_REUSABLE; + + if ((ret = avctx->reget_buffer(avctx, &ctx->pic)) < 0) { + av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); + return ret; + } + + c->last_rgb_pic = NULL; + } + c->rgb_pic = ctx->pic.data[0] + + ctx->pic.linesize[0] * (avctx->height - 1); + c->rgb_stride = -ctx->pic.linesize[0]; + + ctx->pic.key_frame = keyframe; + ctx->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; + + if (is_555) { + bytestream2_init(&gB, buf, buf_size); + + if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1, + keyframe, avctx->width, avctx->height)) + return AVERROR_INVALIDDATA; + + buf_size -= bytestream2_tell(&gB); + } else if (is_rle) { + init_get_bits(&gb, buf, buf_size * 8); + if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride, + c->rgb_pic, c->rgb_stride, c->pal, keyframe, + ctx->split_position, 0, + avctx->width, avctx->height)) + return ret; + align_get_bits(&gb); + + if (c->slice_split) + if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride, + c->rgb_pic, c->rgb_stride, c->pal, keyframe, + ctx->split_position, 1, + avctx->width, avctx->height)) + return ret; + + align_get_bits(&gb); + buf += get_bits_count(&gb) >> 3; + buf_size -= get_bits_count(&gb) >> 3; + } else { + if (keyframe) + ff_mss12_codec_reset(c); + else if (c->corrupted) + return AVERROR_INVALIDDATA; + bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING); + arith2_init(&acoder, &gB); + c->keyframe = keyframe; + if (c->corrupted = ff_mss12_decode_rect(&c->sc[0], &acoder, 0, 0, + avctx->width, + ctx->split_position)) + return AVERROR_INVALIDDATA; + + buf += arith2_get_consumed_bytes(&acoder); + buf_size -= arith2_get_consumed_bytes(&acoder); + if (c->slice_split) { + if (buf_size < 1) + return AVERROR_INVALIDDATA; + bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING); + arith2_init(&acoder, &gB); + if (c->corrupted = ff_mss12_decode_rect(&c->sc[1], &acoder, 0, + ctx->split_position, + avctx->width, + avctx->height - ctx->split_position)) + return AVERROR_INVALIDDATA; + + buf += arith2_get_consumed_bytes(&acoder); + buf_size -= arith2_get_consumed_bytes(&acoder); + } + } + + if (has_wmv9) { + for (i = 0; i < used_rects; i++) { + int x = wmv9rects[i].x; + int y = wmv9rects[i].y; + int w = wmv9rects[i].w; + int h = wmv9rects[i].h; + if (wmv9rects[i].coded) { + int WMV9codedFrameSize; + if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf))) + return AVERROR_INVALIDDATA; + if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3, + x, y, w, h, wmv9_mask)) + return ret; + buf += WMV9codedFrameSize + 3; + buf_size -= WMV9codedFrameSize + 3; + } else { + uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3; + if (wmv9_mask != -1) { + ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride, + wmv9_mask, + c->pal_pic + y * c->pal_stride + x, + c->pal_stride, + w, h); + } else { + do { + memset(dst, 0x80, w * 3); + dst += c->rgb_stride; + } while (--h); + } + } + } + } + + if (buf_size) + av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n"); + + *data_size = sizeof(AVFrame); + *(AVFrame *)data = ctx->pic; + + return avpkt->size; +} + +static av_cold int wmv9_init(AVCodecContext *avctx) +{ + VC1Context *v = avctx->priv_data; + + v->s.avctx = avctx; + avctx->flags |= CODEC_FLAG_EMU_EDGE; + v->s.flags |= CODEC_FLAG_EMU_EDGE; + + if (avctx->idct_algo == FF_IDCT_AUTO) + avctx->idct_algo = FF_IDCT_WMV2; + + if (ff_vc1_init_common(v) < 0) + return -1; + ff_vc1dsp_init(&v->vc1dsp); + + v->profile = PROFILE_MAIN; + + v->zz_8x4 = ff_wmv2_scantableA; + v->zz_4x8 = ff_wmv2_scantableB; + v->res_y411 = 0; + v->res_sprite = 0; + + v->frmrtq_postproc = 7; + v->bitrtq_postproc = 31; + + v->res_x8 = 0; + v->multires = 0; + v->res_fasttx = 1; + + v->fastuvmc = 0; + + v->extended_mv = 0; + + v->dquant = 1; + v->vstransform = 1; + + v->res_transtab = 0; + + v->overlap = 0; + + v->s.resync_marker = 0; + v->rangered = 0; + + v->s.max_b_frames = avctx->max_b_frames = 0; + v->quantizer_mode = 0; + + v->finterpflag = 0; + + v->res_rtm_flag = 1; + + ff_vc1_init_transposed_scantables(v); + + if (ff_msmpeg4_decode_init(avctx) < 0 || + ff_vc1_decode_init_alloc_tables(v) < 0) + return -1; + + /* error concealment */ + v->s.me.qpel_put = v->s.dsp.put_qpel_pixels_tab; + v->s.me.qpel_avg = v->s.dsp.avg_qpel_pixels_tab; + + return 0; +} + +static av_cold int mss2_decode_end(AVCodecContext *avctx) +{ + MSS2Context *const ctx = avctx->priv_data; + + if (ctx->pic.data[0]) + avctx->release_buffer(avctx, &ctx->pic); + if (ctx->last_pic.data[0]) + avctx->release_buffer(avctx, &ctx->last_pic); + + ff_mss12_decode_end(&ctx->c); + av_freep(&ctx->c.pal_pic); + av_freep(&ctx->c.last_pal_pic); + ff_vc1_decode_end(avctx); + + return 0; +} + +static av_cold int mss2_decode_init(AVCodecContext *avctx) +{ + MSS2Context * const ctx = avctx->priv_data; + MSS12Context *c = &ctx->c; + int ret; + c->avctx = avctx; + avctx->coded_frame = &ctx->pic; + if (ret = ff_mss12_decode_init(c, 1)) + return ret; + c->pal_stride = c->mask_stride; + c->pal_pic = av_malloc(c->pal_stride * avctx->height); + c->last_pal_pic = av_malloc(c->pal_stride * avctx->height); + if (!c->pal_pic || !c->last_pal_pic) { + mss2_decode_end(avctx); + return AVERROR(ENOMEM); + } + if (ret = wmv9_init(avctx)) { + mss2_decode_end(avctx); + return ret; + } + ff_mss2dsp_init(&ctx->dsp); + return 0; +} + +AVCodec ff_mss2_decoder = { + .name = "mss2", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_MSS2, + .priv_data_size = sizeof(MSS2Context), + .init = mss2_decode_init, + .close = mss2_decode_end, + .decode = mss2_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("MS Windows Media Video V9 Screen"), +}; -- cgit v1.2.3