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4349 | Serge | 1 | /* |
2 | * MPEG1/2 common code |
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3 | * Copyright (c) 2007 Aurelien Jacobs |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #ifndef AVCODEC_MPEG12_H |
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23 | #define AVCODEC_MPEG12_H |
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24 | |||
25 | #include "mpegvideo.h" |
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26 | |||
27 | #define DC_VLC_BITS 9 |
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28 | #define MV_VLC_BITS 9 |
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29 | #define TEX_VLC_BITS 9 |
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30 | |||
31 | #define MBINCR_VLC_BITS 9 |
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32 | #define MB_PAT_VLC_BITS 9 |
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33 | #define MB_PTYPE_VLC_BITS 6 |
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34 | #define MB_BTYPE_VLC_BITS 6 |
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35 | |||
36 | extern VLC ff_dc_lum_vlc; |
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37 | extern VLC ff_dc_chroma_vlc; |
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38 | extern VLC ff_mbincr_vlc; |
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39 | extern VLC ff_mb_ptype_vlc; |
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40 | extern VLC ff_mb_btype_vlc; |
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41 | extern VLC ff_mb_pat_vlc; |
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42 | extern VLC ff_mv_vlc; |
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43 | |||
44 | extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3]; |
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45 | |||
46 | void ff_mpeg12_common_init(MpegEncContext *s); |
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47 | void ff_mpeg12_init_vlcs(void); |
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48 | |||
49 | static inline int decode_dc(GetBitContext *gb, int component) |
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50 | { |
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51 | int code, diff; |
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52 | |||
53 | if (component == 0) { |
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54 | code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2); |
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55 | } else { |
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56 | code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2); |
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57 | } |
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58 | if (code < 0){ |
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59 | av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n"); |
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60 | return 0xffff; |
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61 | } |
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62 | if (code == 0) { |
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63 | diff = 0; |
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64 | } else { |
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65 | diff = get_xbits(gb, code); |
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66 | } |
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67 | return diff; |
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68 | } |
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69 | |||
70 | int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n); |
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71 | void ff_mpeg1_clean_buffers(MpegEncContext *s); |
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72 | int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s); |
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73 | |||
74 | #endif /* AVCODEC_MPEG12_H */> |