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6148 | serge | 1 | /* |
2 | * Microsoft RLE video decoder |
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3 | * Copyright (C) 2003 the ffmpeg project |
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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 | /** |
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23 | * @file |
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24 | * MS RLE video decoder by Mike Melanson (melanson@pcisys.net) |
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25 | * For more information about the MS RLE format, visit: |
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26 | * http://www.pcisys.net/~melanson/codecs/ |
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27 | * |
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28 | * The MS RLE decoder outputs PAL8 colorspace data. |
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29 | */ |
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30 | |||
31 | #include |
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32 | #include |
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33 | #include |
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34 | |||
35 | #include "avcodec.h" |
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36 | #include "internal.h" |
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37 | #include "msrledec.h" |
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38 | |||
39 | typedef struct MsrleContext { |
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40 | AVCodecContext *avctx; |
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41 | AVFrame frame; |
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42 | |||
43 | GetByteContext gb; |
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44 | const unsigned char *buf; |
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45 | int size; |
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46 | |||
47 | uint32_t pal[256]; |
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48 | } MsrleContext; |
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49 | |||
50 | static av_cold int msrle_decode_init(AVCodecContext *avctx) |
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51 | { |
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52 | MsrleContext *s = avctx->priv_data; |
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53 | int i; |
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54 | |||
55 | s->avctx = avctx; |
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56 | |||
57 | switch (avctx->bits_per_coded_sample) { |
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58 | case 1: |
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59 | avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; |
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60 | break; |
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61 | case 4: |
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62 | case 8: |
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63 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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64 | break; |
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65 | case 24: |
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66 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
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67 | break; |
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68 | default: |
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69 | av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n"); |
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70 | return AVERROR_INVALIDDATA; |
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71 | } |
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72 | |||
73 | avcodec_get_frame_defaults(&s->frame); |
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74 | |||
75 | if (avctx->extradata_size >= 4) |
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76 | for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++) |
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77 | s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i); |
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78 | |||
79 | return 0; |
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80 | } |
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81 | |||
82 | static int msrle_decode_frame(AVCodecContext *avctx, |
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83 | void *data, int *got_frame, |
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84 | AVPacket *avpkt) |
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85 | { |
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86 | const uint8_t *buf = avpkt->data; |
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87 | int buf_size = avpkt->size; |
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88 | MsrleContext *s = avctx->priv_data; |
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89 | int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8; |
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90 | int ret; |
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91 | |||
92 | s->buf = buf; |
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93 | s->size = buf_size; |
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94 | |||
95 | if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0) |
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96 | return ret; |
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97 | |||
98 | if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) { |
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99 | const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); |
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100 | |||
101 | if (pal) { |
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102 | s->frame.palette_has_changed = 1; |
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103 | memcpy(s->pal, pal, AVPALETTE_SIZE); |
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104 | } |
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105 | /* make the palette available */ |
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106 | memcpy(s->frame.data[1], s->pal, AVPALETTE_SIZE); |
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107 | } |
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108 | |||
109 | /* FIXME how to correctly detect RLE ??? */ |
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110 | if (avctx->height * istride == avpkt->size) { /* assume uncompressed */ |
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111 | int linesize = (avctx->width * avctx->bits_per_coded_sample + 7) / 8; |
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112 | uint8_t *ptr = s->frame.data[0]; |
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113 | uint8_t *buf = avpkt->data + (avctx->height-1)*istride; |
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114 | int i, j; |
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115 | |||
116 | for (i = 0; i < avctx->height; i++) { |
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117 | if (avctx->bits_per_coded_sample == 4) { |
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118 | for (j = 0; j < avctx->width - 1; j += 2) { |
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119 | ptr[j+0] = buf[j>>1] >> 4; |
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120 | ptr[j+1] = buf[j>>1] & 0xF; |
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121 | } |
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122 | if (avctx->width & 1) |
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123 | ptr[j+0] = buf[j>>1] >> 4; |
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124 | } else { |
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125 | memcpy(ptr, buf, linesize); |
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126 | } |
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127 | buf -= istride; |
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128 | ptr += s->frame.linesize[0]; |
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129 | } |
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130 | } else { |
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131 | bytestream2_init(&s->gb, buf, buf_size); |
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132 | ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, &s->gb); |
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133 | } |
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134 | |||
135 | if ((ret = av_frame_ref(data, &s->frame)) < 0) |
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136 | return ret; |
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137 | |||
138 | *got_frame = 1; |
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139 | |||
140 | /* report that the buffer was completely consumed */ |
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141 | return buf_size; |
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142 | } |
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143 | |||
144 | static av_cold int msrle_decode_end(AVCodecContext *avctx) |
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145 | { |
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146 | MsrleContext *s = avctx->priv_data; |
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147 | |||
148 | /* release the last frame */ |
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149 | av_frame_unref(&s->frame); |
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150 | |||
151 | return 0; |
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152 | } |
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153 | |||
154 | AVCodec ff_msrle_decoder = { |
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155 | .name = "msrle", |
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156 | .long_name = NULL_IF_CONFIG_SMALL("Microsoft RLE"), |
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157 | .type = AVMEDIA_TYPE_VIDEO, |
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158 | .id = AV_CODEC_ID_MSRLE, |
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159 | .priv_data_size = sizeof(MsrleContext), |
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160 | .init = msrle_decode_init, |
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161 | .close = msrle_decode_end, |
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162 | .decode = msrle_decode_frame, |
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163 | .capabilities = CODEC_CAP_DR1, |
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164 | };>>>=>>24><24>> |