| 1 | /* |
| 2 | * Electronic Arts TQI Video Decoder |
| 3 | * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Electronic Arts TQI Video Decoder |
| 25 | * @author Peter Ross <pross@xvid.org> |
| 26 | * @see http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI |
| 27 | */ |
| 28 | |
| 29 | #include "avcodec.h" |
| 30 | #include "blockdsp.h" |
| 31 | #include "bswapdsp.h" |
| 32 | #include "get_bits.h" |
| 33 | #include "aandcttab.h" |
| 34 | #include "eaidct.h" |
| 35 | #include "idctdsp.h" |
| 36 | #include "internal.h" |
| 37 | #include "mpeg12.h" |
| 38 | #include "mpegvideo.h" |
| 39 | |
| 40 | typedef struct TqiContext { |
| 41 | MpegEncContext s; |
| 42 | BswapDSPContext bsdsp; |
| 43 | void *bitstream_buf; |
| 44 | unsigned int bitstream_buf_size; |
| 45 | DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
| 46 | } TqiContext; |
| 47 | |
| 48 | static av_cold int tqi_decode_init(AVCodecContext *avctx) |
| 49 | { |
| 50 | TqiContext *t = avctx->priv_data; |
| 51 | MpegEncContext *s = &t->s; |
| 52 | s->avctx = avctx; |
| 53 | ff_blockdsp_init(&s->bdsp, avctx); |
| 54 | ff_bswapdsp_init(&t->bsdsp); |
| 55 | ff_idctdsp_init(&s->idsp, avctx); |
| 56 | ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE); |
| 57 | ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct); |
| 58 | s->qscale = 1; |
| 59 | avctx->framerate = (AVRational){ 15, 1 }; |
| 60 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 61 | ff_mpeg12_init_vlcs(); |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64]) |
| 66 | { |
| 67 | int n; |
| 68 | s->bdsp.clear_blocks(block[0]); |
| 69 | for (n=0; n<6; n++) |
| 70 | if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0) |
| 71 | return -1; |
| 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64]) |
| 77 | { |
| 78 | MpegEncContext *s = &t->s; |
| 79 | int linesize = frame->linesize[0]; |
| 80 | uint8_t *dest_y = frame->data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16; |
| 81 | uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8; |
| 82 | uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8; |
| 83 | |
| 84 | ff_ea_idct_put_c(dest_y , linesize, block[0]); |
| 85 | ff_ea_idct_put_c(dest_y + 8, linesize, block[1]); |
| 86 | ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]); |
| 87 | ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]); |
| 88 | if(!(s->avctx->flags&CODEC_FLAG_GRAY)) { |
| 89 | ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]); |
| 90 | ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]); |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | static void tqi_calculate_qtable(MpegEncContext *s, int quant) |
| 95 | { |
| 96 | const int qscale = (215 - 2*quant)*5; |
| 97 | int i; |
| 98 | s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11; |
| 99 | for(i=1; i<64; i++) |
| 100 | s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14; |
| 101 | } |
| 102 | |
| 103 | static int tqi_decode_frame(AVCodecContext *avctx, |
| 104 | void *data, int *got_frame, |
| 105 | AVPacket *avpkt) |
| 106 | { |
| 107 | const uint8_t *buf = avpkt->data; |
| 108 | int buf_size = avpkt->size; |
| 109 | const uint8_t *buf_end = buf+buf_size; |
| 110 | TqiContext *t = avctx->priv_data; |
| 111 | MpegEncContext *s = &t->s; |
| 112 | AVFrame *frame = data; |
| 113 | int ret; |
| 114 | |
| 115 | s->width = AV_RL16(&buf[0]); |
| 116 | s->height = AV_RL16(&buf[2]); |
| 117 | tqi_calculate_qtable(s, buf[4]); |
| 118 | buf += 8; |
| 119 | |
| 120 | ret = ff_set_dimensions(s->avctx, s->width, s->height); |
| 121 | if (ret < 0) |
| 122 | return ret; |
| 123 | |
| 124 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 125 | return ret; |
| 126 | |
| 127 | av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size, |
| 128 | buf_end - buf); |
| 129 | if (!t->bitstream_buf) |
| 130 | return AVERROR(ENOMEM); |
| 131 | t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf, |
| 132 | (buf_end - buf) / 4); |
| 133 | init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf)); |
| 134 | |
| 135 | s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0; |
| 136 | for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++) |
| 137 | for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++) |
| 138 | { |
| 139 | if (tqi_decode_mb(s, t->block) < 0) |
| 140 | goto end; |
| 141 | tqi_idct_put(t, frame, t->block); |
| 142 | } |
| 143 | end: |
| 144 | |
| 145 | *got_frame = 1; |
| 146 | return buf_size; |
| 147 | } |
| 148 | |
| 149 | static av_cold int tqi_decode_end(AVCodecContext *avctx) |
| 150 | { |
| 151 | TqiContext *t = avctx->priv_data; |
| 152 | av_freep(&t->bitstream_buf); |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | AVCodec ff_eatqi_decoder = { |
| 157 | .name = "eatqi", |
| 158 | .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"), |
| 159 | .type = AVMEDIA_TYPE_VIDEO, |
| 160 | .id = AV_CODEC_ID_TQI, |
| 161 | .priv_data_size = sizeof(TqiContext), |
| 162 | .init = tqi_decode_init, |
| 163 | .close = tqi_decode_end, |
| 164 | .decode = tqi_decode_frame, |
| 165 | .capabilities = CODEC_CAP_DR1, |
| 166 | }; |