GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/eacmv.c Lines: 106 119 89.1 %
Date: 2019-11-22 03:34:36 Branches: 48 72 66.7 %

Line Branch Exec Source
1
/*
2
 * Electronic Arts CMV Video Decoder
3
 * Copyright (c) 2007-2008 Peter Ross
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 CMV Video Decoder
25
 * by Peter Ross (pross@xvid.org)
26
 *
27
 * Technical details here:
28
 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_CMV
29
 */
30
31
#include "libavutil/common.h"
32
#include "libavutil/intreadwrite.h"
33
#include "libavutil/imgutils.h"
34
#include "avcodec.h"
35
#include "internal.h"
36
37
typedef struct CmvContext {
38
    AVCodecContext *avctx;
39
    AVFrame *last_frame;   ///< last
40
    AVFrame *last2_frame;  ///< second-last
41
    int width, height;
42
    unsigned int palette[AVPALETTE_COUNT];
43
} CmvContext;
44
45
2
static av_cold int cmv_decode_init(AVCodecContext *avctx){
46
2
    CmvContext *s = avctx->priv_data;
47
48
2
    s->avctx = avctx;
49
2
    avctx->pix_fmt = AV_PIX_FMT_PAL8;
50
51
2
    s->last_frame  = av_frame_alloc();
52
2
    s->last2_frame = av_frame_alloc();
53

2
    if (!s->last_frame || !s->last2_frame) {
54
        av_frame_free(&s->last_frame);
55
        av_frame_free(&s->last2_frame);
56
        return AVERROR(ENOMEM);
57
    }
58
59
2
    return 0;
60
}
61
62
3
static void cmv_decode_intra(CmvContext * s, AVFrame *frame,
63
                             const uint8_t *buf, const uint8_t *buf_end)
64
{
65
3
    unsigned char *dst = frame->data[0];
66
    int i;
67
68

603
    for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
69
600
        memcpy(dst, buf, s->avctx->width);
70
600
        dst += frame->linesize[0];
71
600
        buf += s->avctx->width;
72
    }
73
3
}
74
75
401014
static void cmv_motcomp(unsigned char *dst, ptrdiff_t dst_stride,
76
                        const unsigned char *src, ptrdiff_t src_stride,
77
                        int x, int y,
78
                        int xoffset, int yoffset,
79
                        int width, int height){
80
    int i,j;
81
82
2005070
    for(j=y;j<y+4;j++)
83
8020280
    for(i=x;i<x+4;i++)
84
    {
85

6416224
        if (i+xoffset>=0 && i+xoffset<width &&
86

6416224
            j+yoffset>=0 && j+yoffset<height) {
87
6416224
            dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset];
88
        }else{
89
            dst[j*dst_stride + i] = 0;
90
        }
91
    }
92
401014
}
93
94
192
static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf,
95
                             const uint8_t *buf_end)
96
{
97
192
    const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16);
98
    int x,y,i;
99
100
192
    i = 0;
101
9792
    for(y=0; y<s->avctx->height/4; y++)
102

489600
    for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
103
480000
        if (buf[i]==0xFF) {
104
140687
            unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4;
105

140687
            if (raw+16<buf_end && *raw==0xFF) { /* intra */
106
78986
                raw++;
107
78986
                memcpy(dst, raw, 4);
108
78986
                memcpy(dst +     frame->linesize[0], raw+4, 4);
109
78986
                memcpy(dst + 2 * frame->linesize[0], raw+8, 4);
110
78986
                memcpy(dst + 3 * frame->linesize[0], raw+12, 4);
111
78986
                raw+=16;
112
61701
            }else if(raw<buf_end) {  /* inter using second-last frame as reference */
113
61701
                int xoffset = (*raw & 0xF) - 7;
114
61701
                int yoffset = ((*raw >> 4)) - 7;
115
61701
                if (s->last2_frame->data[0])
116
61701
                    cmv_motcomp(frame->data[0], frame->linesize[0],
117
61701
                                s->last2_frame->data[0], s->last2_frame->linesize[0],
118
61701
                                x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
119
61701
                raw++;
120
            }
121
        }else{  /* inter using last frame as reference */
122
339313
            int xoffset = (buf[i] & 0xF) - 7;
123
339313
            int yoffset = ((buf[i] >> 4)) - 7;
124
339313
            if (s->last_frame->data[0])
125
339313
                cmv_motcomp(frame->data[0], frame->linesize[0],
126
339313
                            s->last_frame->data[0], s->last_frame->linesize[0],
127
339313
                            x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
128
        }
129
480000
        i++;
130
    }
131
192
}
132
133
3
static int cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
134
{
135
    int pal_start, pal_count, i, ret, fps;
136
137
3
    if(buf_end - buf < 16) {
138
        av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
139
        return AVERROR_INVALIDDATA;
140
    }
141
142
3
    s->width  = AV_RL16(&buf[4]);
143
3
    s->height = AV_RL16(&buf[6]);
144
145
3
    if (s->width  != s->avctx->width ||
146
2
        s->height != s->avctx->height) {
147
1
        av_frame_unref(s->last_frame);
148
1
        av_frame_unref(s->last2_frame);
149
    }
150
151
3
    ret = ff_set_dimensions(s->avctx, s->width, s->height);
152
3
    if (ret < 0)
153
        return ret;
154
155
3
    fps = AV_RL16(&buf[10]);
156
3
    if (fps > 0)
157
3
        s->avctx->framerate = (AVRational){ fps, 1 };
158
159
3
    pal_start = AV_RL16(&buf[12]);
160
3
    pal_count = AV_RL16(&buf[14]);
161
162
3
    buf += 16;
163

576
    for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
164
573
        s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
165
573
        buf += 3;
166
    }
167
168
3
    return 0;
169
}
170
171
#define EA_PREAMBLE_SIZE 8
172
#define MVIh_TAG MKTAG('M', 'V', 'I', 'h')
173
174
195
static int cmv_decode_frame(AVCodecContext *avctx,
175
                            void *data, int *got_frame,
176
                            AVPacket *avpkt)
177
{
178
195
    const uint8_t *buf = avpkt->data;
179
195
    int buf_size = avpkt->size;
180
195
    CmvContext *s = avctx->priv_data;
181
195
    const uint8_t *buf_end = buf + buf_size;
182
195
    AVFrame *frame = data;
183
    int ret;
184
185
195
    if (buf_end - buf < EA_PREAMBLE_SIZE)
186
        return AVERROR_INVALIDDATA;
187
188

195
    if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) {
189
3
        unsigned size = AV_RL32(buf + 4);
190
3
        ret = cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
191
3
        if (ret < 0)
192
            return ret;
193
3
        if (size > buf_end - buf - EA_PREAMBLE_SIZE)
194
            return AVERROR_INVALIDDATA;
195
3
        buf += size;
196
    }
197
198
195
    if ((ret = av_image_check_size(s->width, s->height, 0, s->avctx)) < 0)
199
        return ret;
200
201
195
    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
202
        return ret;
203
204
195
    memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
205
206
195
    buf += EA_PREAMBLE_SIZE;
207
195
    if ((buf[0]&1)) {  // subtype
208
192
        cmv_decode_inter(s, frame, buf+2, buf_end);
209
192
        frame->key_frame = 0;
210
192
        frame->pict_type = AV_PICTURE_TYPE_P;
211
    }else{
212
3
        frame->key_frame = 1;
213
3
        frame->pict_type = AV_PICTURE_TYPE_I;
214
3
        cmv_decode_intra(s, frame, buf+2, buf_end);
215
    }
216
217
195
    av_frame_unref(s->last2_frame);
218
195
    av_frame_move_ref(s->last2_frame, s->last_frame);
219
195
    if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
220
        return ret;
221
222
195
    *got_frame = 1;
223
224
195
    return buf_size;
225
}
226
227
2
static av_cold int cmv_decode_end(AVCodecContext *avctx){
228
2
    CmvContext *s = avctx->priv_data;
229
230
2
    av_frame_free(&s->last_frame);
231
2
    av_frame_free(&s->last2_frame);
232
233
2
    return 0;
234
}
235
236
AVCodec ff_eacmv_decoder = {
237
    .name           = "eacmv",
238
    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
239
    .type           = AVMEDIA_TYPE_VIDEO,
240
    .id             = AV_CODEC_ID_CMV,
241
    .priv_data_size = sizeof(CmvContext),
242
    .init           = cmv_decode_init,
243
    .close          = cmv_decode_end,
244
    .decode         = cmv_decode_frame,
245
    .capabilities   = AV_CODEC_CAP_DR1,
246
};