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- /*
- * Copyright (c) 2002 The Libav Project
- *
- * 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
- */
-
- #include "avcodec.h"
- #include "h263.h"
- #include "internal.h"
- #include "intrax8.h"
- #include "mathops.h"
- #include "mpegutils.h"
- #include "mpegvideo.h"
- #include "msmpeg4.h"
- #include "msmpeg4data.h"
- #include "wmv2.h"
-
-
- static void parse_mb_skip(Wmv2Context *w)
- {
- int mb_x, mb_y;
- MpegEncContext *const s = &w->s;
- uint32_t *const mb_type = s->current_picture_ptr->mb_type;
-
- w->skip_type = get_bits(&s->gb, 2);
- switch (w->skip_type) {
- case SKIP_TYPE_NONE:
- for (mb_y = 0; mb_y < s->mb_height; mb_y++)
- for (mb_x = 0; mb_x < s->mb_width; mb_x++)
- mb_type[mb_y * s->mb_stride + mb_x] =
- MB_TYPE_16x16 | MB_TYPE_L0;
- break;
- case SKIP_TYPE_MPEG:
- for (mb_y = 0; mb_y < s->mb_height; mb_y++)
- for (mb_x = 0; mb_x < s->mb_width; mb_x++)
- mb_type[mb_y * s->mb_stride + mb_x] =
- (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
- break;
- case SKIP_TYPE_ROW:
- for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
- if (get_bits1(&s->gb)) {
- for (mb_x = 0; mb_x < s->mb_width; mb_x++)
- mb_type[mb_y * s->mb_stride + mb_x] =
- MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
- } else {
- for (mb_x = 0; mb_x < s->mb_width; mb_x++)
- mb_type[mb_y * s->mb_stride + mb_x] =
- (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
- }
- }
- break;
- case SKIP_TYPE_COL:
- for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
- if (get_bits1(&s->gb)) {
- for (mb_y = 0; mb_y < s->mb_height; mb_y++)
- mb_type[mb_y * s->mb_stride + mb_x] =
- MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
- } else {
- for (mb_y = 0; mb_y < s->mb_height; mb_y++)
- mb_type[mb_y * s->mb_stride + mb_x] =
- (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
- }
- }
- break;
- }
- }
-
- static int decode_ext_header(Wmv2Context *w)
- {
- MpegEncContext *const s = &w->s;
- GetBitContext gb;
- int fps;
- int code;
-
- if (s->avctx->extradata_size < 4)
- return AVERROR_INVALIDDATA;
-
- init_get_bits(&gb, s->avctx->extradata, 32);
-
- fps = get_bits(&gb, 5);
- s->bit_rate = get_bits(&gb, 11) * 1024;
- w->mspel_bit = get_bits1(&gb);
- s->loop_filter = get_bits1(&gb);
- w->abt_flag = get_bits1(&gb);
- w->j_type_bit = get_bits1(&gb);
- w->top_left_mv_flag = get_bits1(&gb);
- w->per_mb_rl_bit = get_bits1(&gb);
- code = get_bits(&gb, 3);
-
- if (code == 0)
- return AVERROR_INVALIDDATA;
-
- s->slice_height = s->mb_height / code;
-
- if (s->avctx->debug & FF_DEBUG_PICT_INFO)
- av_log(s->avctx, AV_LOG_DEBUG,
- "fps:%d, br:%d, qpbit:%d, abt_flag:%d, j_type_bit:%d, "
- "tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, "
- "slices:%d\n",
- fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit,
- w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
- code);
- return 0;
- }
-
- int ff_wmv2_decode_picture_header(MpegEncContext *s)
- {
- Wmv2Context *const w = (Wmv2Context *) s;
- int code;
-
- if (s->picture_number == 0)
- decode_ext_header(w);
-
- s->pict_type = get_bits1(&s->gb) + 1;
- if (s->pict_type == AV_PICTURE_TYPE_I) {
- code = get_bits(&s->gb, 7);
- av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
- }
- s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
- if (s->qscale <= 0)
- return AVERROR_INVALIDDATA;
-
- return 0;
- }
-
- int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
- {
- Wmv2Context *const w = (Wmv2Context *) s;
-
- if (s->pict_type == AV_PICTURE_TYPE_I) {
- if (w->j_type_bit)
- w->j_type = get_bits1(&s->gb);
- else
- w->j_type = 0; // FIXME check
-
- if (!w->j_type) {
- if (w->per_mb_rl_bit)
- s->per_mb_rl_table = get_bits1(&s->gb);
- else
- s->per_mb_rl_table = 0;
-
- if (!s->per_mb_rl_table) {
- s->rl_chroma_table_index = decode012(&s->gb);
- s->rl_table_index = decode012(&s->gb);
- }
-
- s->dc_table_index = get_bits1(&s->gb);
- }
- s->inter_intra_pred = 0;
- s->no_rounding = 1;
- if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
- av_log(s->avctx, AV_LOG_DEBUG,
- "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
- s->qscale, s->rl_chroma_table_index, s->rl_table_index,
- s->dc_table_index, s->per_mb_rl_table, w->j_type);
- }
- } else {
- int cbp_index;
- w->j_type = 0;
-
- parse_mb_skip(w);
- cbp_index = decode012(&s->gb);
- if (s->qscale <= 10) {
- int map[3] = { 0, 2, 1 };
- w->cbp_table_index = map[cbp_index];
- } else if (s->qscale <= 20) {
- int map[3] = { 1, 0, 2 };
- w->cbp_table_index = map[cbp_index];
- } else {
- int map[3] = {2,1,0};
- w->cbp_table_index = map[cbp_index];
- }
-
- if (w->mspel_bit)
- s->mspel = get_bits1(&s->gb);
- else
- s->mspel = 0; // FIXME check
-
- if (w->abt_flag) {
- w->per_mb_abt = get_bits1(&s->gb) ^ 1;
- if (!w->per_mb_abt)
- w->abt_type = decode012(&s->gb);
- }
-
- if (w->per_mb_rl_bit)
- s->per_mb_rl_table = get_bits1(&s->gb);
- else
- s->per_mb_rl_table = 0;
-
- if (!s->per_mb_rl_table) {
- s->rl_table_index = decode012(&s->gb);
- s->rl_chroma_table_index = s->rl_table_index;
- }
-
- s->dc_table_index = get_bits1(&s->gb);
- s->mv_table_index = get_bits1(&s->gb);
-
- s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
- s->no_rounding ^= 1;
-
- if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
- av_log(s->avctx, AV_LOG_DEBUG,
- "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d "
- "per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
- s->rl_table_index, s->rl_chroma_table_index,
- s->dc_table_index, s->mv_table_index,
- s->per_mb_rl_table, s->qscale, s->mspel,
- w->per_mb_abt, w->abt_type, w->cbp_table_index,
- s->inter_intra_pred);
- }
- }
- s->esc3_level_length = 0;
- s->esc3_run_length = 0;
- s->picture_number++; // FIXME ?
-
- if (w->j_type) {
- ff_intrax8_decode_picture(&w->x8, &s->current_picture,
- &s->gb, &s->mb_x, &s->mb_y,
- 2 * s->qscale, (s->qscale - 1) | 1,
- s->loop_filter, s->low_delay);
-
- ff_er_add_slice(&w->s.er, 0, 0,
- (w->s.mb_x >> 1) - 1, (w->s.mb_y >> 1) - 1,
- ER_MB_END);
- return 1;
- }
-
- return 0;
- }
-
- static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr)
- {
- MpegEncContext *const s = &w->s;
- int ret;
-
- ret = ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
-
- if (ret < 0)
- return ret;
-
- if ((((*mx_ptr) | (*my_ptr)) & 1) && s->mspel)
- w->hshift = get_bits1(&s->gb);
- else
- w->hshift = 0;
-
- return 0;
- }
-
- static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py)
- {
- MpegEncContext *const s = &w->s;
- int xy, wrap, diff, type;
- int16_t *A, *B, *C, *mot_val;
-
- wrap = s->b8_stride;
- xy = s->block_index[0];
-
- mot_val = s->current_picture.motion_val[0][xy];
-
- A = s->current_picture.motion_val[0][xy - 1];
- B = s->current_picture.motion_val[0][xy - wrap];
- C = s->current_picture.motion_val[0][xy + 2 - wrap];
-
- if (s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
- diff = FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
- else
- diff = 0;
-
- if (diff >= 8)
- type = get_bits1(&s->gb);
- else
- type = 2;
-
- if (type == 0) {
- *px = A[0];
- *py = A[1];
- } else if (type == 1) {
- *px = B[0];
- *py = B[1];
- } else {
- /* special case for first (slice) line */
- if (s->first_slice_line) {
- *px = A[0];
- *py = A[1];
- } else {
- *px = mid_pred(A[0], B[0], C[0]);
- *py = mid_pred(A[1], B[1], C[1]);
- }
- }
-
- return mot_val;
- }
-
- static inline int wmv2_decode_inter_block(Wmv2Context *w, int16_t *block,
- int n, int cbp)
- {
- MpegEncContext *const s = &w->s;
- static const int sub_cbp_table[3] = { 2, 3, 1 };
- int sub_cbp, ret;
-
- if (!cbp) {
- s->block_last_index[n] = -1;
- return 0;
- }
-
- if (w->per_block_abt)
- w->abt_type = decode012(&s->gb);
- w->abt_type_table[n] = w->abt_type;
-
- if (w->abt_type) {
- // const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].permutated;
- const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].scantable;
- // const uint8_t *scantable = w->abt_type - 1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
-
- sub_cbp = sub_cbp_table[decode012(&s->gb)];
-
- if (sub_cbp & 1)
- if ((ret = ff_msmpeg4_decode_block(s, block, n, 1, scantable)) < 0)
- return ret;
-
- if (sub_cbp & 2)
- if ((ret = ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable)) < 0)
- return ret;
-
- s->block_last_index[n] = 63;
-
- return 0;
- } else {
- return ff_msmpeg4_decode_block(s, block, n, 1,
- s->inter_scantable.permutated);
- }
- }
-
- int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
- {
- Wmv2Context *const w = (Wmv2Context *) s;
- int cbp, code, i, ret;
- uint8_t *coded_val;
-
- if (w->j_type)
- return 0;
-
- if (s->pict_type == AV_PICTURE_TYPE_P) {
- if (IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])) {
- /* skip mb */
- s->mb_intra = 0;
- for (i = 0; i < 6; i++)
- s->block_last_index[i] = -1;
- s->mv_dir = MV_DIR_FORWARD;
- s->mv_type = MV_TYPE_16X16;
- s->mv[0][0][0] = 0;
- s->mv[0][0][1] = 0;
- s->mb_skipped = 1;
- w->hshift = 0;
- return 0;
- }
-
- code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table,
- MB_NON_INTRA_VLC_BITS, 3);
- if (code < 0)
- return AVERROR_INVALIDDATA;
- s->mb_intra = (~code & 0x40) >> 6;
-
- cbp = code & 0x3f;
- } else {
- s->mb_intra = 1;
- code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
- if (code < 0) {
- av_log(s->avctx, AV_LOG_ERROR,
- "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
- return AVERROR_INVALIDDATA;
- }
- /* predict coded block pattern */
- cbp = 0;
- for (i = 0; i < 6; i++) {
- int val = ((code >> (5 - i)) & 1);
- if (i < 4) {
- int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
- val = val ^ pred;
- *coded_val = val;
- }
- cbp |= val << (5 - i);
- }
- }
-
- if (!s->mb_intra) {
- int mx, my;
- wmv2_pred_motion(w, &mx, &my);
-
- if (cbp) {
- s->bdsp.clear_blocks(s->block[0]);
- if (s->per_mb_rl_table) {
- s->rl_table_index = decode012(&s->gb);
- s->rl_chroma_table_index = s->rl_table_index;
- }
-
- if (w->abt_flag && w->per_mb_abt) {
- w->per_block_abt = get_bits1(&s->gb);
- if (!w->per_block_abt)
- w->abt_type = decode012(&s->gb);
- } else
- w->per_block_abt = 0;
- }
-
- if ((ret = wmv2_decode_motion(w, &mx, &my)) < 0)
- return ret;
-
- s->mv_dir = MV_DIR_FORWARD;
- s->mv_type = MV_TYPE_16X16;
- s->mv[0][0][0] = mx;
- s->mv[0][0][1] = my;
-
- for (i = 0; i < 6; i++) {
- if ((ret = wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1)) < 0) {
- av_log(s->avctx, AV_LOG_ERROR,
- "\nerror while decoding inter block: %d x %d (%d)\n",
- s->mb_x, s->mb_y, i);
- return ret;
- }
- }
- } else {
- if (s->pict_type == AV_PICTURE_TYPE_P)
- ff_dlog(s->avctx, "%d%d ", s->inter_intra_pred, cbp);
- ff_dlog(s->avctx, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
- ((cbp & 3) ? 1 : 0) + ((cbp & 0x3C) ? 2 : 0),
- show_bits(&s->gb, 24));
- s->ac_pred = get_bits1(&s->gb);
- if (s->inter_intra_pred) {
- s->h263_aic_dir = get_vlc2(&s->gb, ff_inter_intra_vlc.table,
- INTER_INTRA_VLC_BITS, 1);
- ff_dlog(s->avctx, "%d%d %d %d/",
- s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
- }
- if (s->per_mb_rl_table && cbp) {
- s->rl_table_index = decode012(&s->gb);
- s->rl_chroma_table_index = s->rl_table_index;
- }
-
- s->bdsp.clear_blocks(s->block[0]);
- for (i = 0; i < 6; i++) {
- if ((ret = ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL)) < 0) {
- av_log(s->avctx, AV_LOG_ERROR,
- "\nerror while decoding intra block: %d x %d (%d)\n",
- s->mb_x, s->mb_y, i);
- return ret;
- }
- }
- }
-
- return 0;
- }
-
- static av_cold int wmv2_decode_init(AVCodecContext *avctx)
- {
- Wmv2Context *const w = avctx->priv_data;
- int ret;
-
- if ((ret = ff_msmpeg4_decode_init(avctx)) < 0)
- return ret;
-
- ff_wmv2_common_init(w);
-
- return ff_intrax8_common_init(avctx, &w->x8, &w->s.idsp,
- w->s.block, w->s.block_last_index,
- w->s.mb_width, w->s.mb_height);
- }
-
- static av_cold int wmv2_decode_end(AVCodecContext *avctx)
- {
- Wmv2Context *w = avctx->priv_data;
-
- ff_intrax8_common_end(&w->x8);
- return ff_h263_decode_end(avctx);
- }
-
- AVCodec ff_wmv2_decoder = {
- .name = "wmv2",
- .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_WMV2,
- .priv_data_size = sizeof(Wmv2Context),
- .init = wmv2_decode_init,
- .close = wmv2_decode_end,
- .decode = ff_h263_decode_frame,
- .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
- .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
- AV_PIX_FMT_NONE },
- };
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