FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/eatqi.c
Date: 2022-11-28 23:49:43
Exec Total Coverage
Lines: 70 77 90.9%
Branches: 15 22 68.2%

Line Branch Exec Source
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 "libavutil/mem_internal.h"
30
31 #include "avcodec.h"
32 #include "blockdsp.h"
33 #include "bswapdsp.h"
34 #include "codec_internal.h"
35 #include "decode.h"
36 #include "get_bits.h"
37 #include "aandcttab.h"
38 #include "eaidct.h"
39 #include "mpeg12data.h"
40 #include "mpeg12dec.h"
41
42 typedef struct TqiContext {
43 AVCodecContext *avctx;
44 GetBitContext gb;
45 BlockDSPContext bdsp;
46 BswapDSPContext bsdsp;
47
48 void *bitstream_buf;
49 unsigned int bitstream_buf_size;
50
51 int mb_x, mb_y;
52 uint16_t intra_matrix[64];
53 int last_dc[3];
54
55 DECLARE_ALIGNED(32, int16_t, block)[6][64];
56 } TqiContext;
57
58 3 static av_cold int tqi_decode_init(AVCodecContext *avctx)
59 {
60 3 TqiContext *t = avctx->priv_data;
61
62 3 ff_blockdsp_init(&t->bdsp);
63 3 ff_bswapdsp_init(&t->bsdsp);
64
65 3 avctx->framerate = (AVRational){ 15, 1 };
66 3 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
67 3 ff_mpeg12_init_vlcs();
68 3 return 0;
69 }
70
71 8400 static int tqi_decode_mb(TqiContext *t, int16_t (*block)[64])
72 {
73 int n;
74
75 8400 t->bdsp.clear_blocks(block[0]);
76
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58800 for (n = 0; n < 6; n++) {
77 50400 int ret = ff_mpeg1_decode_block_intra(&t->gb,
78 50400 t->intra_matrix,
79 ff_zigzag_direct,
80 50400 t->last_dc, block[n], n, 1);
81
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50400 if (ret < 0) {
82 av_log(t->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
83 t->mb_x, t->mb_y);
84 return ret;
85 }
86 }
87
88 8400 return 0;
89 }
90
91 8400 static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
92 int16_t (*block)[64])
93 {
94 8400 TqiContext *t = avctx->priv_data;
95 8400 ptrdiff_t linesize = frame->linesize[0];
96 8400 uint8_t *dest_y = frame->data[0] + t->mb_y * 16 * linesize + t->mb_x * 16;
97 8400 uint8_t *dest_cb = frame->data[1] + t->mb_y * 8 * frame->linesize[1] + t->mb_x * 8;
98 8400 uint8_t *dest_cr = frame->data[2] + t->mb_y * 8 * frame->linesize[2] + t->mb_x * 8;
99
100 8400 ff_ea_idct_put_c(dest_y , linesize, block[0]);
101 8400 ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
102 8400 ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
103 8400 ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
104
105
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8400 if (!(avctx->flags & AV_CODEC_FLAG_GRAY)) {
106 8400 ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
107 8400 ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
108 }
109 8400 }
110
111 28 static void tqi_calculate_qtable(TqiContext *t, int quant)
112 {
113 28 const int64_t qscale = (215 - 2*quant)*5;
114 int i;
115
116 28 t->intra_matrix[0] = (ff_inv_aanscales[0] * ff_mpeg1_default_intra_matrix[0]) >> 11;
117
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1792 for(i=1; i<64; i++)
118 1764 t->intra_matrix[i] = (ff_inv_aanscales[i] * ff_mpeg1_default_intra_matrix[i] * qscale + 32) >> 14;
119 28 }
120
121 28 static int tqi_decode_frame(AVCodecContext *avctx, AVFrame *frame,
122 int *got_frame, AVPacket *avpkt)
123 {
124 28 const uint8_t *buf = avpkt->data;
125 28 int buf_size = avpkt->size;
126 28 const uint8_t *buf_end = buf+buf_size;
127 28 TqiContext *t = avctx->priv_data;
128 int ret, w, h;
129
130
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28 if (buf_size < 12)
131 return AVERROR_INVALIDDATA;
132
133 28 t->avctx = avctx;
134
135 28 w = AV_RL16(&buf[0]);
136 28 h = AV_RL16(&buf[2]);
137 28 tqi_calculate_qtable(t, buf[4]);
138 28 buf += 8;
139
140 28 ret = ff_set_dimensions(avctx, w, h);
141
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28 if (ret < 0)
142 return ret;
143
144
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28 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
145 return ret;
146
147 28 av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
148 28 buf_end - buf);
149
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28 if (!t->bitstream_buf)
150 return AVERROR(ENOMEM);
151 28 t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
152 28 (buf_end - buf) / 4);
153 28 init_get_bits(&t->gb, t->bitstream_buf, 8 * (buf_end - buf));
154
155 28 t->last_dc[0] =
156 28 t->last_dc[1] =
157 28 t->last_dc[2] = 0;
158
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364 for (t->mb_y = 0; t->mb_y < (h + 15) / 16; t->mb_y++) {
159
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8736 for (t->mb_x = 0; t->mb_x < (w + 15) / 16; t->mb_x++) {
160
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8400 if (tqi_decode_mb(t, t->block) < 0)
161 goto end;
162 8400 tqi_idct_put(avctx, frame, t->block);
163 }
164 }
165 28 end:
166
167 28 *got_frame = 1;
168 28 return buf_size;
169 }
170
171 3 static av_cold int tqi_decode_end(AVCodecContext *avctx)
172 {
173 3 TqiContext *t = avctx->priv_data;
174 3 av_freep(&t->bitstream_buf);
175 3 return 0;
176 }
177
178 const FFCodec ff_eatqi_decoder = {
179 .p.name = "eatqi",
180 CODEC_LONG_NAME("Electronic Arts TQI Video"),
181 .p.type = AVMEDIA_TYPE_VIDEO,
182 .p.id = AV_CODEC_ID_TQI,
183 .priv_data_size = sizeof(TqiContext),
184 .init = tqi_decode_init,
185 .close = tqi_decode_end,
186 FF_CODEC_DECODE_CB(tqi_decode_frame),
187 .p.capabilities = AV_CODEC_CAP_DR1,
188 };
189