FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/eatqi.c
Date: 2024-05-08 16:03:45
Exec Total Coverage
Lines: 73 77 94.8%
Functions: 6 6 100.0%
Branches: 17 22 77.3%
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.h"
30 #include "libavutil/mem_internal.h"
31
32 #include "avcodec.h"
33 #include "blockdsp.h"
34 #include "bswapdsp.h"
35 #include "codec_internal.h"
36 #include "decode.h"
37 #include "get_bits.h"
38 #include "aandcttab.h"
39 #include "eaidct.h"
40 #include "mpeg12data.h"
41 #include "mpeg12dec.h"
42
43 typedef struct TqiContext {
44 AVCodecContext *avctx;
45 GetBitContext gb;
46 BlockDSPContext bdsp;
47 BswapDSPContext bsdsp;
48
49 void *bitstream_buf;
50 unsigned int bitstream_buf_size;
51
52 int mb_x, mb_y;
53 uint16_t intra_matrix[64];
54 int last_dc[3];
55
56 DECLARE_ALIGNED(32, int16_t, block)[6][64];
57 } TqiContext;
58
59 3 static av_cold int tqi_decode_init(AVCodecContext *avctx)
60 {
61 3 TqiContext *t = avctx->priv_data;
62
63 3 ff_blockdsp_init(&t->bdsp);
64 3 ff_bswapdsp_init(&t->bsdsp);
65
66 3 avctx->framerate = (AVRational){ 15, 1 };
67 3 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
68 3 ff_mpeg12_init_vlcs();
69 3 return 0;
70 }
71
72 8460 static int tqi_decode_mb(TqiContext *t, int16_t (*block)[64])
73 {
74 int n;
75
76 8460 t->bdsp.clear_blocks(block[0]);
77
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 59216 for (n = 0; n < 6; n++) {
78 50757 int ret = ff_mpeg1_decode_block_intra(&t->gb,
79 50757 t->intra_matrix,
80 ff_zigzag_direct,
81 50757 t->last_dc, block[n], n, 1);
82
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 50757 if (ret < 0) {
83 1 av_log(t->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
84 t->mb_x, t->mb_y);
85 1 return ret;
86 }
87 }
88
89 8459 return 0;
90 }
91
92 8459 static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
93 int16_t (*block)[64])
94 {
95 8459 TqiContext *t = avctx->priv_data;
96 8459 ptrdiff_t linesize = frame->linesize[0];
97 8459 uint8_t *dest_y = frame->data[0] + t->mb_y * 16 * linesize + t->mb_x * 16;
98 8459 uint8_t *dest_cb = frame->data[1] + t->mb_y * 8 * frame->linesize[1] + t->mb_x * 8;
99 8459 uint8_t *dest_cr = frame->data[2] + t->mb_y * 8 * frame->linesize[2] + t->mb_x * 8;
100
101 8459 ff_ea_idct_put_c(dest_y , linesize, block[0]);
102 8459 ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
103 8459 ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
104 8459 ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
105
106
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 8459 if (!(avctx->flags & AV_CODEC_FLAG_GRAY)) {
107 8459 ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
108 8459 ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
109 }
110 8459 }
111
112 29 static void tqi_calculate_qtable(TqiContext *t, int quant)
113 {
114 29 const int64_t qscale = (215 - 2*quant)*5;
115 int i;
116
117 29 t->intra_matrix[0] = (ff_inv_aanscales[0] * ff_mpeg1_default_intra_matrix[0]) >> 11;
118
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 1856 for(i=1; i<64; i++)
119 1827 t->intra_matrix[i] = (ff_inv_aanscales[i] * ff_mpeg1_default_intra_matrix[i] * qscale + 32) >> 14;
120 29 }
121
122 29 static int tqi_decode_frame(AVCodecContext *avctx, AVFrame *frame,
123 int *got_frame, AVPacket *avpkt)
124 {
125 29 const uint8_t *buf = avpkt->data;
126 29 int buf_size = avpkt->size;
127 29 const uint8_t *buf_end = buf+buf_size;
128 29 TqiContext *t = avctx->priv_data;
129 int ret, w, h;
130
131
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 29 if (buf_size < 12)
132 ✗ return AVERROR_INVALIDDATA;
133
134 29 t->avctx = avctx;
135
136 29 w = AV_RL16(&buf[0]);
137 29 h = AV_RL16(&buf[2]);
138 29 tqi_calculate_qtable(t, buf[4]);
139 29 buf += 8;
140
141 29 ret = ff_set_dimensions(avctx, w, h);
142
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 29 if (ret < 0)
143 ✗ return ret;
144
145
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 29 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
146 ✗ return ret;
147
148 29 av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
149 29 buf_end - buf);
150
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 29 if (!t->bitstream_buf)
151 ✗ return AVERROR(ENOMEM);
152 29 t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
153 29 (buf_end - buf) / 4);
154 29 init_get_bits(&t->gb, t->bitstream_buf, 8 * (buf_end - buf));
155
156 29 t->last_dc[0] =
157 29 t->last_dc[1] =
158 29 t->last_dc[2] = 0;
159
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 367 for (t->mb_y = 0; t->mb_y < (h + 15) / 16; t->mb_y++) {
160
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 8798 for (t->mb_x = 0; t->mb_x < (w + 15) / 16; t->mb_x++) {
161
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 8460 if (tqi_decode_mb(t, t->block) < 0)
162 1 goto end;
163 8459 tqi_idct_put(avctx, frame, t->block);
164 }
165 }
166 28 end:
167
168 29 *got_frame = 1;
169 29 return buf_size;
170 }
171
172 3 static av_cold int tqi_decode_end(AVCodecContext *avctx)
173 {
174 3 TqiContext *t = avctx->priv_data;
175 3 av_freep(&t->bitstream_buf);
176 3 return 0;
177 }
178
179 const FFCodec ff_eatqi_decoder = {
180 .p.name = "eatqi",
181 CODEC_LONG_NAME("Electronic Arts TQI Video"),
182 .p.type = AVMEDIA_TYPE_VIDEO,
183 .p.id = AV_CODEC_ID_TQI,
184 .priv_data_size = sizeof(TqiContext),
185 .init = tqi_decode_init,
186 .close = tqi_decode_end,
187 FF_CODEC_DECODE_CB(tqi_decode_frame),
188 .p.capabilities = AV_CODEC_CAP_DR1,
189 };
190