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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * MxPEG decoder |
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| 3 | * Copyright (c) 2011 Anatoly Nenashev |
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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 | |||
| 23 | /** |
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| 24 | * @file |
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| 25 | * MxPEG decoder |
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| 26 | */ |
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| 27 | |||
| 28 | #include "internal.h" |
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| 29 | #include "mjpeg.h" |
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| 30 | #include "mjpegdec.h" |
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| 31 | |||
| 32 | typedef struct MXpegDecodeContext { |
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| 33 | MJpegDecodeContext jpg; |
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| 34 | AVFrame picture[2]; /* pictures array */ |
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| 35 | int picture_index; /* index of current picture */ |
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| 36 | int got_sof_data; /* true if SOF data successfully parsed */ |
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| 37 | int got_mxm_bitmask; /* true if MXM bitmask available */ |
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| 38 | uint8_t *mxm_bitmask; /* bitmask buffer */ |
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| 39 | unsigned bitmask_size; /* size of bitmask */ |
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| 40 | int has_complete_frame; /* true if has complete frame */ |
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| 41 | uint8_t *completion_bitmask; /* completion bitmask of macroblocks */ |
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| 42 | unsigned mb_width, mb_height; /* size of picture in MB's from MXM header */ |
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| 43 | } MXpegDecodeContext; |
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| 44 | |||
| 45 | static av_cold int mxpeg_decode_init(AVCodecContext *avctx) |
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| 46 | { |
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| 47 | MXpegDecodeContext *s = avctx->priv_data; |
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| 48 | |||
| 49 | s->jpg.picture_ptr = &s->picture[0]; |
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| 50 | return ff_mjpeg_decode_init(avctx); |
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| 51 | } |
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| 52 | |||
| 53 | static int mxpeg_decode_app(MXpegDecodeContext *s, |
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| 54 | const uint8_t *buf_ptr, int buf_size) |
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| 55 | { |
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| 56 | int len; |
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| 57 | if (buf_size < 2) |
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| 58 | return 0; |
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| 59 | len = AV_RB16(buf_ptr); |
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| 60 | skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size)); |
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| 61 | |||
| 62 | return 0; |
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| 63 | } |
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| 64 | |||
| 65 | static int mxpeg_decode_mxm(MXpegDecodeContext *s, |
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| 66 | const uint8_t *buf_ptr, int buf_size) |
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| 67 | { |
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| 68 | unsigned bitmask_size, mb_count; |
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| 69 | int i; |
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| 70 | |||
| 71 | s->mb_width = AV_RL16(buf_ptr+4); |
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| 72 | s->mb_height = AV_RL16(buf_ptr+6); |
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| 73 | mb_count = s->mb_width * s->mb_height; |
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| 74 | |||
| 75 | bitmask_size = (mb_count + 7) >> 3; |
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| 76 | if (bitmask_size > buf_size - 12) { |
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| 77 | av_log(s->jpg.avctx, AV_LOG_ERROR, |
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| 78 | "MXM bitmask is not complete\n"); |
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| 79 | return AVERROR(EINVAL); |
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| 80 | } |
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| 81 | |||
| 82 | if (s->bitmask_size != bitmask_size) { |
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| 83 | s->bitmask_size = 0; |
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| 84 | av_freep(&s->mxm_bitmask); |
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| 85 | s->mxm_bitmask = av_malloc(bitmask_size); |
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| 86 | if (!s->mxm_bitmask) { |
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| 87 | av_log(s->jpg.avctx, AV_LOG_ERROR, |
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| 88 | "MXM bitmask memory allocation error\n"); |
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| 89 | return AVERROR(ENOMEM); |
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| 90 | } |
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| 91 | |||
| 92 | av_freep(&s->completion_bitmask); |
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| 93 | s->completion_bitmask = av_mallocz(bitmask_size); |
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| 94 | if (!s->completion_bitmask) { |
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| 95 | av_log(s->jpg.avctx, AV_LOG_ERROR, |
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| 96 | "Completion bitmask memory allocation error\n"); |
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| 97 | return AVERROR(ENOMEM); |
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| 98 | } |
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| 99 | |||
| 100 | s->bitmask_size = bitmask_size; |
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| 101 | } |
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| 102 | |||
| 103 | memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size); |
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| 104 | s->got_mxm_bitmask = 1; |
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| 105 | |||
| 106 | if (!s->has_complete_frame) { |
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| 107 | uint8_t completion_check = 0xFF; |
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| 108 | for (i = 0; i < bitmask_size; ++i) { |
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| 109 | s->completion_bitmask[i] |= s->mxm_bitmask[i]; |
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| 110 | completion_check &= s->completion_bitmask[i]; |
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| 111 | } |
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| 112 | s->has_complete_frame = !(completion_check ^ 0xFF); |
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| 113 | } |
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| 114 | |||
| 115 | return 0; |
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| 116 | } |
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| 117 | |||
| 118 | static int mxpeg_decode_com(MXpegDecodeContext *s, |
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| 119 | const uint8_t *buf_ptr, int buf_size) |
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| 120 | { |
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| 121 | int len, ret = 0; |
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| 122 | if (buf_size < 2) |
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| 123 | return 0; |
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| 124 | len = AV_RB16(buf_ptr); |
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| 125 | if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) { |
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| 126 | ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2); |
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| 127 | } |
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| 128 | skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size)); |
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| 129 | |||
| 130 | return ret; |
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| 131 | } |
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| 132 | |||
| 133 | static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg, |
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| 134 | AVFrame *reference_ptr) |
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| 135 | { |
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| 136 | if ((jpg->width + 0x0F)>>4 != s->mb_width || |
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| 137 | (jpg->height + 0x0F)>>4 != s->mb_height) { |
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| 138 | av_log(jpg->avctx, AV_LOG_ERROR, |
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| 139 | "Picture dimensions stored in SOF and MXM mismatch\n"); |
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| 140 | return AVERROR(EINVAL); |
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| 141 | } |
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| 142 | |||
| 143 | if (reference_ptr->data[0]) { |
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| 144 | int i; |
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| 145 | for (i = 0; i < MAX_COMPONENTS; ++i) { |
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| 146 | if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) || |
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| 147 | reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) { |
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| 148 | av_log(jpg->avctx, AV_LOG_ERROR, |
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| 149 | "Dimensions of current and reference picture mismatch\n"); |
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| 150 | return AVERROR(EINVAL); |
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| 151 | } |
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| 152 | } |
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| 153 | } |
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| 154 | |||
| 155 | return 0; |
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| 156 | } |
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| 157 | |||
| 158 | static int mxpeg_decode_frame(AVCodecContext *avctx, |
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| 159 | void *data, int *got_frame, |
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| 160 | AVPacket *avpkt) |
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| 161 | { |
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| 162 | const uint8_t *buf = avpkt->data; |
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| 163 | int buf_size = avpkt->size; |
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| 164 | MXpegDecodeContext *s = avctx->priv_data; |
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| 165 | MJpegDecodeContext *jpg = &s->jpg; |
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| 166 | const uint8_t *buf_end, *buf_ptr; |
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| 167 | const uint8_t *unescaped_buf_ptr; |
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| 168 | int unescaped_buf_size; |
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| 169 | int start_code; |
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| 170 | int ret; |
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| 171 | |||
| 172 | buf_ptr = buf; |
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| 173 | buf_end = buf + buf_size; |
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| 174 | jpg->got_picture = 0; |
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| 175 | s->got_mxm_bitmask = 0; |
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| 176 | while (buf_ptr < buf_end) { |
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| 177 | start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end, |
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| 178 | &unescaped_buf_ptr, &unescaped_buf_size); |
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| 179 | if (start_code < 0) |
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| 180 | goto the_end; |
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| 181 | { |
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| 182 | init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8); |
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| 183 | |||
| 184 | if (start_code >= APP0 && start_code <= APP15) { |
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| 185 | mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size); |
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| 186 | } |
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| 187 | |||
| 188 | switch (start_code) { |
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| 189 | case SOI: |
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| 190 | if (jpg->got_picture) //emulating EOI |
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| 191 | goto the_end; |
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| 192 | break; |
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| 193 | case EOI: |
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| 194 | goto the_end; |
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| 195 | case DQT: |
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| 196 | ret = ff_mjpeg_decode_dqt(jpg); |
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| 197 | if (ret < 0) { |
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| 198 | av_log(avctx, AV_LOG_ERROR, |
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| 199 | "quantization table decode error\n"); |
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| 200 | return ret; |
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| 201 | } |
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| 202 | break; |
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| 203 | case DHT: |
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| 204 | ret = ff_mjpeg_decode_dht(jpg); |
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| 205 | if (ret < 0) { |
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| 206 | av_log(avctx, AV_LOG_ERROR, |
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| 207 | "huffman table decode error\n"); |
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| 208 | return ret; |
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| 209 | } |
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| 210 | break; |
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| 211 | case COM: |
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| 212 | ret = mxpeg_decode_com(s, unescaped_buf_ptr, |
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| 213 | unescaped_buf_size); |
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| 214 | if (ret < 0) |
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| 215 | return ret; |
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| 216 | break; |
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| 217 | case SOF0: |
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| 218 | s->got_sof_data = 0; |
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| 219 | ret = ff_mjpeg_decode_sof(jpg); |
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| 220 | if (ret < 0) { |
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| 221 | av_log(avctx, AV_LOG_ERROR, |
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| 222 | "SOF data decode error\n"); |
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| 223 | return ret; |
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| 224 | } |
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| 225 | if (jpg->interlaced) { |
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| 226 | av_log(avctx, AV_LOG_ERROR, |
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| 227 | "Interlaced mode not supported in MxPEG\n"); |
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| 228 | return AVERROR(EINVAL); |
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| 229 | } |
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| 230 | s->got_sof_data = 1; |
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| 231 | break; |
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| 232 | case SOS: |
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| 233 | if (!s->got_sof_data) { |
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| 234 | av_log(avctx, AV_LOG_WARNING, |
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| 235 | "Can not process SOS without SOF data, skipping\n"); |
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| 236 | break; |
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| 237 | } |
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| 238 | if (!jpg->got_picture) { |
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| 239 | if (jpg->first_picture) { |
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| 240 | av_log(avctx, AV_LOG_WARNING, |
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| 241 | "First picture has no SOF, skipping\n"); |
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| 242 | break; |
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| 243 | } |
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| 244 | if (!s->got_mxm_bitmask){ |
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| 245 | av_log(avctx, AV_LOG_WARNING, |
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| 246 | "Non-key frame has no MXM, skipping\n"); |
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| 247 | break; |
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| 248 | } |
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| 249 | /* use stored SOF data to allocate current picture */ |
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| 250 | av_frame_unref(jpg->picture_ptr); |
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| 251 | if ((ret = ff_get_buffer(avctx, jpg->picture_ptr, |
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| 252 | AV_GET_BUFFER_FLAG_REF)) < 0) |
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| 253 | return ret; |
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| 254 | jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P; |
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| 255 | jpg->picture_ptr->key_frame = 0; |
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| 256 | jpg->got_picture = 1; |
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| 257 | } else { |
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| 258 | jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I; |
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| 259 | jpg->picture_ptr->key_frame = 1; |
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| 260 | } |
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| 261 | |||
| 262 | if (s->got_mxm_bitmask) { |
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| 263 | AVFrame *reference_ptr = &s->picture[s->picture_index ^ 1]; |
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| 264 | if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0) |
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| 265 | break; |
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| 266 | |||
| 267 | /* allocate dummy reference picture if needed */ |
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| 268 | if (!reference_ptr->data[0] && |
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| 269 | (ret = ff_get_buffer(avctx, reference_ptr, |
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| 270 | AV_GET_BUFFER_FLAG_REF)) < 0) |
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| 271 | return ret; |
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| 272 | |||
| 273 | ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, reference_ptr); |
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| 274 | if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) |
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| 275 | return ret; |
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| 276 | } else { |
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| 277 | ret = ff_mjpeg_decode_sos(jpg, NULL, NULL); |
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| 278 | if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) |
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| 279 | return ret; |
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| 280 | } |
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| 281 | |||
| 282 | break; |
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| 283 | } |
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| 284 | |||
| 285 | buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3; |
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| 286 | } |
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| 287 | |||
| 288 | } |
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| 289 | |||
| 290 | the_end: |
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| 291 | if (jpg->got_picture) { |
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| 292 | int ret = av_frame_ref(data, jpg->picture_ptr); |
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| 293 | if (ret < 0) |
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| 294 | return ret; |
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| 295 | *got_frame = 1; |
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| 296 | |||
| 297 | s->picture_index ^= 1; |
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| 298 | jpg->picture_ptr = &s->picture[s->picture_index]; |
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| 299 | |||
| 300 | if (!s->has_complete_frame) { |
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| 301 | if (!s->got_mxm_bitmask) |
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| 302 | s->has_complete_frame = 1; |
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| 303 | else |
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| 304 | *got_frame = 0; |
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| 305 | } |
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| 306 | } |
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| 307 | |||
| 308 | return buf_ptr - buf; |
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| 309 | } |
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| 310 | |||
| 311 | static av_cold int mxpeg_decode_end(AVCodecContext *avctx) |
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| 312 | { |
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| 313 | MXpegDecodeContext *s = avctx->priv_data; |
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| 314 | MJpegDecodeContext *jpg = &s->jpg; |
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| 315 | int i; |
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| 316 | |||
| 317 | jpg->picture_ptr = NULL; |
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| 318 | ff_mjpeg_decode_end(avctx); |
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| 319 | |||
| 320 | for (i = 0; i < 2; ++i) |
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| 321 | av_frame_unref(&s->picture[i]); |
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| 322 | |||
| 323 | av_freep(&s->mxm_bitmask); |
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| 324 | av_freep(&s->completion_bitmask); |
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| 325 | |||
| 326 | return 0; |
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| 327 | } |
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| 328 | |||
| 329 | AVCodec ff_mxpeg_decoder = { |
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| 330 | .name = "mxpeg", |
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| 331 | .long_name = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"), |
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| 332 | .type = AVMEDIA_TYPE_VIDEO, |
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| 333 | .id = AV_CODEC_ID_MXPEG, |
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| 334 | .priv_data_size = sizeof(MXpegDecodeContext), |
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| 335 | .init = mxpeg_decode_init, |
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| 336 | .close = mxpeg_decode_end, |
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| 337 | .decode = mxpeg_decode_frame, |
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| 338 | .capabilities = CODEC_CAP_DR1, |
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| 339 | .max_lowres = 3, |
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| 340 | }; |