/* * MPEG4 encoder/decoder internal header. * Copyright (c) 2000,2001 Fabrice Bellard * Copyright (c) 2002-2010 Michael Niedermayer * * 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 */ #ifndef AVCODEC_MPEG4VIDEO_H #define AVCODEC_MPEG4VIDEO_H #include #include "get_bits.h" #include "mpegvideo.h" #include "rl.h" // shapes #define RECT_SHAPE 0 #define BIN_SHAPE 1 #define BIN_ONLY_SHAPE 2 #define GRAY_SHAPE 3 #define SIMPLE_VO_TYPE 1 #define CORE_VO_TYPE 3 #define MAIN_VO_TYPE 4 #define NBIT_VO_TYPE 5 #define ARTS_VO_TYPE 10 #define ACE_VO_TYPE 12 #define ADV_SIMPLE_VO_TYPE 17 // aspect_ratio_info #define EXTENDED_PAR 15 //vol_sprite_usage / sprite_enable #define STATIC_SPRITE 1 #define GMC_SPRITE 2 #define MOTION_MARKER 0x1F001 #define DC_MARKER 0x6B001 #define VOS_STARTCODE 0x1B0 #define USER_DATA_STARTCODE 0x1B2 #define GOP_STARTCODE 0x1B3 #define VISUAL_OBJ_STARTCODE 0x1B5 #define VOP_STARTCODE 0x1B6 typedef struct Mpeg4DecContext { MpegEncContext m; ///< number of bits to represent the fractional part of time int time_increment_bits; int shape; int vol_sprite_usage; // reversible vlc int rvlc; ///< could this stream contain resync markers int resync_marker; } Mpeg4DecContext; /* dc encoding for mpeg4 */ extern const uint8_t ff_mpeg4_DCtab_lum[13][2]; extern const uint8_t ff_mpeg4_DCtab_chrom[13][2]; extern const uint16_t ff_mpeg4_intra_vlc[103][2]; extern const int8_t ff_mpeg4_intra_level[102]; extern const int8_t ff_mpeg4_intra_run[102]; extern RLTable ff_mpeg4_rl_intra; /* Note this is identical to the intra rvlc except that it is reordered. */ extern RLTable ff_rvlc_rl_inter; extern RLTable ff_rvlc_rl_intra; extern const uint16_t ff_sprite_trajectory_tab[15][2]; extern const uint8_t ff_mb_type_b_tab[4][2]; /* these matrixes will be permuted for the idct */ extern const int16_t ff_mpeg4_default_intra_matrix[64]; extern const int16_t ff_mpeg4_default_non_intra_matrix[64]; extern const uint8_t ff_mpeg4_y_dc_scale_table[32]; extern const uint8_t ff_mpeg4_c_dc_scale_table[32]; extern const uint16_t ff_mpeg4_resync_prefix[8]; extern const uint8_t ff_mpeg4_dc_threshold[8]; void ff_mpeg4_encode_mb(MpegEncContext *s, int16_t block[6][64], int motion_x, int motion_y); void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir); void ff_set_mpeg4_time(MpegEncContext *s); void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number); int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb); void ff_mpeg4_encode_video_packet_header(MpegEncContext *s); void ff_mpeg4_clean_buffers(MpegEncContext *s); void ff_mpeg4_stuffing(PutBitContext *pbc); void ff_mpeg4_init_partitions(MpegEncContext *s); void ff_mpeg4_merge_partitions(MpegEncContext *s); void ff_clean_mpeg4_qscales(MpegEncContext *s); int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx); int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s); int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx); void ff_mpeg4_init_direct_mv(MpegEncContext *s); /** * * @return the mb_type */ int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my); extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3]; #if 0 //3IV1 is quite rare and it slows things down a tiny bit #define IS_3IV1 s->codec_tag == AV_RL32("3IV1") #else #define IS_3IV1 0 #endif /** * Predict the dc. * encoding quantized level -> quantized diff * decoding quantized diff -> quantized level * @param n block index (0-3 are luma, 4-5 are chroma) * @param dir_ptr pointer to an integer where the prediction direction will be stored */ static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding) { int a, b, c, wrap, pred, scale, ret; int16_t *dc_val; /* find prediction */ if (n < 4) scale = s->y_dc_scale; else scale = s->c_dc_scale; if (IS_3IV1) scale = 8; wrap = s->block_wrap[n]; dc_val = s->dc_val[0] + s->block_index[n]; /* B C * A X */ a = dc_val[-1]; b = dc_val[-1 - wrap]; c = dc_val[-wrap]; /* outside slice handling (we can't do that by memset as we need the * dc for error resilience) */ if (s->first_slice_line && n != 3) { if (n != 2) b = c = 1024; if (n != 1 && s->mb_x == s->resync_mb_x) b = a = 1024; } if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) { if (n == 0 || n == 4 || n == 5) b = 1024; } if (abs(a - b) < abs(b - c)) { pred = c; *dir_ptr = 1; /* top */ } else { pred = a; *dir_ptr = 0; /* left */ } /* we assume pred is positive */ pred = FASTDIV((pred + (scale >> 1)), scale); if (encoding) { ret = level - pred; } else { level += pred; ret = level; if (s->err_recognition & AV_EF_BITSTREAM) { if (level < 0) { av_log(s->avctx, AV_LOG_ERROR, "dc<0 at %dx%d\n", s->mb_x, s->mb_y); return -1; } if (level * scale > 2048 + scale) { av_log(s->avctx, AV_LOG_ERROR, "dc overflow at %dx%d\n", s->mb_x, s->mb_y); return -1; } } } level *= scale; if (level & (~2047)) { if (level < 0) level = 0; else if (!(s->workaround_bugs & FF_BUG_DC_CLIP)) level = 2047; } dc_val[0] = level; return ret; } #endif /* AVCODEC_MPEG4VIDEO_H */