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4349 | Serge | 1 | /* |
2 | * Electronic Arts TQI Video Decoder |
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3 | * Copyright (c) 2007-2009 Peter Ross |
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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 St, 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 | * Electronic Arts TQI Video Decoder |
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25 | * @author Peter Ross |
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26 | * @see http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI |
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27 | */ |
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28 | |||
29 | #include "avcodec.h" |
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30 | #include "get_bits.h" |
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31 | #include "aandcttab.h" |
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32 | #include "eaidct.h" |
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33 | #include "internal.h" |
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34 | #include "mpeg12.h" |
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35 | #include "mpegvideo.h" |
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36 | |||
37 | typedef struct TqiContext { |
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38 | MpegEncContext s; |
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39 | void *bitstream_buf; |
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40 | unsigned int bitstream_buf_size; |
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41 | DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
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42 | } TqiContext; |
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43 | |||
44 | static av_cold int tqi_decode_init(AVCodecContext *avctx) |
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45 | { |
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46 | TqiContext *t = avctx->priv_data; |
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47 | MpegEncContext *s = &t->s; |
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48 | s->avctx = avctx; |
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49 | ff_dsputil_init(&s->dsp, avctx); |
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50 | ff_init_scantable_permutation(s->dsp.idct_permutation, FF_NO_IDCT_PERM); |
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51 | ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct); |
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52 | s->qscale = 1; |
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53 | avctx->time_base = (AVRational){1, 15}; |
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54 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
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55 | ff_mpeg12_init_vlcs(); |
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56 | return 0; |
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57 | } |
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58 | |||
59 | static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64]) |
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60 | { |
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61 | int n; |
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62 | s->dsp.clear_blocks(block[0]); |
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63 | for (n=0; n<6; n++) |
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64 | if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0) |
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65 | return -1; |
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66 | |||
67 | return 0; |
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68 | } |
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69 | |||
70 | static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64]) |
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71 | { |
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72 | MpegEncContext *s = &t->s; |
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73 | int linesize = frame->linesize[0]; |
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74 | uint8_t *dest_y = frame->data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16; |
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75 | uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8; |
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76 | uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8; |
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77 | |||
78 | ff_ea_idct_put_c(dest_y , linesize, block[0]); |
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79 | ff_ea_idct_put_c(dest_y + 8, linesize, block[1]); |
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80 | ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]); |
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81 | ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]); |
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82 | if(!(s->avctx->flags&CODEC_FLAG_GRAY)) { |
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83 | ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]); |
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84 | ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]); |
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85 | } |
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86 | } |
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87 | |||
88 | static void tqi_calculate_qtable(MpegEncContext *s, int quant) |
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89 | { |
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90 | const int qscale = (215 - 2*quant)*5; |
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91 | int i; |
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92 | s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11; |
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93 | for(i=1; i<64; i++) |
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94 | s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14; |
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95 | } |
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96 | |||
97 | static int tqi_decode_frame(AVCodecContext *avctx, |
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98 | void *data, int *got_frame, |
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99 | AVPacket *avpkt) |
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100 | { |
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101 | const uint8_t *buf = avpkt->data; |
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102 | int buf_size = avpkt->size; |
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103 | const uint8_t *buf_end = buf+buf_size; |
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104 | TqiContext *t = avctx->priv_data; |
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105 | MpegEncContext *s = &t->s; |
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106 | AVFrame *frame = data; |
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107 | int ret; |
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108 | |||
109 | s->width = AV_RL16(&buf[0]); |
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110 | s->height = AV_RL16(&buf[2]); |
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111 | tqi_calculate_qtable(s, buf[4]); |
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112 | buf += 8; |
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113 | |||
114 | if (s->avctx->width!=s->width || s->avctx->height!=s->height) |
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115 | avcodec_set_dimensions(s->avctx, s->width, s->height); |
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116 | |||
117 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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118 | return ret; |
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119 | |||
120 | av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size, |
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121 | buf_end - buf); |
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122 | if (!t->bitstream_buf) |
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123 | return AVERROR(ENOMEM); |
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124 | s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4); |
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125 | init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf)); |
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126 | |||
127 | s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0; |
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128 | for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++) |
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129 | for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++) |
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130 | { |
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131 | if (tqi_decode_mb(s, t->block) < 0) |
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132 | goto end; |
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133 | tqi_idct_put(t, frame, t->block); |
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134 | } |
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135 | end: |
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136 | |||
137 | *got_frame = 1; |
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138 | return buf_size; |
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139 | } |
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140 | |||
141 | static av_cold int tqi_decode_end(AVCodecContext *avctx) |
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142 | { |
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143 | TqiContext *t = avctx->priv_data; |
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144 | av_free(t->bitstream_buf); |
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145 | return 0; |
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146 | } |
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147 | |||
148 | AVCodec ff_eatqi_decoder = { |
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149 | .name = "eatqi", |
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150 | .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"), |
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151 | .type = AVMEDIA_TYPE_VIDEO, |
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152 | .id = AV_CODEC_ID_TQI, |
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153 | .priv_data_size = sizeof(TqiContext), |
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154 | .init = tqi_decode_init, |
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155 | .close = tqi_decode_end, |
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156 | .decode = tqi_decode_frame, |
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157 | .capabilities = CODEC_CAP_DR1, |
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158 | };>(avctx->(avctx->>64;>>6;> |