| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MPEG-4 encoder/decoder internal header. | ||
| 3 | * Copyright (c) 2000,2001 Fabrice Bellard | ||
| 4 | * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at> | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | #ifndef AVCODEC_MPEG4VIDEO_H | ||
| 24 | #define AVCODEC_MPEG4VIDEO_H | ||
| 25 | |||
| 26 | #include <stdint.h> | ||
| 27 | |||
| 28 | #include "mpegvideo.h" | ||
| 29 | |||
| 30 | void ff_mpeg4_clean_buffers(MpegEncContext *s); | ||
| 31 | int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s); | ||
| 32 | void ff_mpeg4_init_direct_mv(MpegEncContext *s); | ||
| 33 | |||
| 34 | /** | ||
| 35 | * @return the mb_type | ||
| 36 | */ | ||
| 37 | int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my); | ||
| 38 | |||
| 39 | #if 0 //3IV1 is quite rare and it slows things down a tiny bit | ||
| 40 | #define IS_3IV1 s->codec_tag == AV_RL32("3IV1") | ||
| 41 | #else | ||
| 42 | #define IS_3IV1 0 | ||
| 43 | #endif | ||
| 44 | |||
| 45 | /** | ||
| 46 | * Predict the dc. | ||
| 47 | * encoding quantized level -> quantized diff | ||
| 48 | * decoding quantized diff -> quantized level | ||
| 49 | * @param n block index (0-3 are luma, 4-5 are chroma) | ||
| 50 | * @param dir_ptr pointer to an integer where the prediction direction will be stored | ||
| 51 | */ | ||
| 52 | 2339274 | static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, | |
| 53 | int *dir_ptr, int encoding) | ||
| 54 | { | ||
| 55 | int a, b, c, wrap, pred, scale, ret; | ||
| 56 | int16_t *dc_val; | ||
| 57 | |||
| 58 | /* find prediction */ | ||
| 59 |
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2339274 | if (n < 4) |
| 60 | 1559516 | scale = s->y_dc_scale; | |
| 61 | else | ||
| 62 | 779758 | scale = s->c_dc_scale; | |
| 63 | if (IS_3IV1) | ||
| 64 | scale = 8; | ||
| 65 | |||
| 66 | 2339274 | wrap = s->block_wrap[n]; | |
| 67 | 2339274 | dc_val = s->dc_val[0] + s->block_index[n]; | |
| 68 | |||
| 69 | /* B C | ||
| 70 | * A X | ||
| 71 | */ | ||
| 72 | 2339274 | a = dc_val[-1]; | |
| 73 | 2339274 | b = dc_val[-1 - wrap]; | |
| 74 | 2339274 | c = dc_val[-wrap]; | |
| 75 | |||
| 76 | /* outside slice handling (we can't do that by memset as we need the | ||
| 77 | * dc for error resilience) */ | ||
| 78 |
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2339274 | if (s->first_slice_line && n != 3) { |
| 79 |
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234510 | if (n != 2) |
| 80 | 187608 | b = c = 1024; | |
| 81 |
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234510 | if (n != 1 && s->mb_x == s->resync_mb_x) |
| 82 | 9928 | b = a = 1024; | |
| 83 | } | ||
| 84 |
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2339274 | if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) { |
| 85 |
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14964 | if (n == 0 || n == 4 || n == 5) |
| 86 | 7482 | b = 1024; | |
| 87 | } | ||
| 88 | |||
| 89 |
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2339274 | if (abs(a - b) < abs(b - c)) { |
| 90 | 860326 | pred = c; | |
| 91 | 860326 | *dir_ptr = 1; /* top */ | |
| 92 | } else { | ||
| 93 | 1478948 | pred = a; | |
| 94 | 1478948 | *dir_ptr = 0; /* left */ | |
| 95 | } | ||
| 96 | /* we assume pred is positive */ | ||
| 97 | 2339274 | pred = FASTDIV((pred + (scale >> 1)), scale); | |
| 98 | |||
| 99 |
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2339274 | if (encoding) { |
| 100 | 1228296 | ret = level - pred; | |
| 101 | } else { | ||
| 102 | 1110978 | level += pred; | |
| 103 | 1110978 | ret = level; | |
| 104 | } | ||
| 105 | 2339274 | level *= scale; | |
| 106 |
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2339274 | if (level & (~2047)) { |
| 107 | ✗ | if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE))) { | |
| 108 | ✗ | if (level < 0) { | |
| 109 | ✗ | av_log(s->avctx, AV_LOG_ERROR, | |
| 110 | "dc<0 at %dx%d\n", s->mb_x, s->mb_y); | ||
| 111 | ✗ | return AVERROR_INVALIDDATA; | |
| 112 | } | ||
| 113 | ✗ | if (level > 2048 + scale) { | |
| 114 | ✗ | av_log(s->avctx, AV_LOG_ERROR, | |
| 115 | "dc overflow at %dx%d\n", s->mb_x, s->mb_y); | ||
| 116 | ✗ | return AVERROR_INVALIDDATA; | |
| 117 | } | ||
| 118 | } | ||
| 119 | ✗ | if (level < 0) | |
| 120 | ✗ | level = 0; | |
| 121 | ✗ | else if (!(s->workaround_bugs & FF_BUG_DC_CLIP)) | |
| 122 | ✗ | level = 2047; | |
| 123 | } | ||
| 124 | 2339274 | dc_val[0] = level; | |
| 125 | |||
| 126 | 2339274 | return ret; | |
| 127 | } | ||
| 128 | |||
| 129 | #endif /* AVCODEC_MPEG4VIDEO_H */ | ||
| 130 |