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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 | static av_cold int cmv_decode_init(AVCodecContext *avctx){ | |
46 | CmvContext *s = avctx->priv_data; | |
47 | ||
48 | s->avctx = avctx; | |
49 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
50 | ||
51 | s->last_frame = av_frame_alloc(); | |
52 | s->last2_frame = av_frame_alloc(); | |
53 | 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 | return 0; | |
60 | } | |
61 | ||
62 | static void cmv_decode_intra(CmvContext * s, AVFrame *frame, | |
63 | const uint8_t *buf, const uint8_t *buf_end) | |
64 | { | |
65 | unsigned char *dst = frame->data[0]; | |
66 | int i; | |
67 | ||
68 | for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) { | |
69 | memcpy(dst, buf, s->avctx->width); | |
70 | dst += frame->linesize[0]; | |
71 | buf += s->avctx->width; | |
72 | } | |
73 | } | |
74 | ||
75 | static void cmv_motcomp(unsigned char *dst, int dst_stride, | |
76 | const unsigned char *src, int src_stride, | |
77 | int x, int y, | |
78 | int xoffset, int yoffset, | |
79 | int width, int height){ | |
80 | int i,j; | |
81 | ||
82 | for(j=y;j<y+4;j++) | |
83 | for(i=x;i<x+4;i++) | |
84 | { | |
85 | if (i+xoffset>=0 && i+xoffset<width && | |
86 | j+yoffset>=0 && j+yoffset<height) { | |
87 | dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset]; | |
88 | }else{ | |
89 | dst[j*dst_stride + i] = 0; | |
90 | } | |
91 | } | |
92 | } | |
93 | ||
94 | static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf, | |
95 | const uint8_t *buf_end) | |
96 | { | |
97 | const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16); | |
98 | int x,y,i; | |
99 | ||
100 | i = 0; | |
101 | for(y=0; y<s->avctx->height/4; y++) | |
102 | for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) { | |
103 | if (buf[i]==0xFF) { | |
104 | unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4; | |
105 | if (raw+16<buf_end && *raw==0xFF) { /* intra */ | |
106 | raw++; | |
107 | memcpy(dst, raw, 4); | |
108 | memcpy(dst + frame->linesize[0], raw+4, 4); | |
109 | memcpy(dst + 2 * frame->linesize[0], raw+8, 4); | |
110 | memcpy(dst + 3 * frame->linesize[0], raw+12, 4); | |
111 | raw+=16; | |
112 | }else if(raw<buf_end) { /* inter using second-last frame as reference */ | |
113 | int xoffset = (*raw & 0xF) - 7; | |
114 | int yoffset = ((*raw >> 4)) - 7; | |
115 | if (s->last2_frame->data[0]) | |
116 | cmv_motcomp(frame->data[0], frame->linesize[0], | |
117 | s->last2_frame->data[0], s->last2_frame->linesize[0], | |
118 | x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height); | |
119 | raw++; | |
120 | } | |
121 | }else{ /* inter using last frame as reference */ | |
122 | int xoffset = (buf[i] & 0xF) - 7; | |
123 | int yoffset = ((buf[i] >> 4)) - 7; | |
124 | if (s->last_frame->data[0]) | |
125 | cmv_motcomp(frame->data[0], frame->linesize[0], | |
126 | s->last_frame->data[0], s->last_frame->linesize[0], | |
127 | x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height); | |
128 | } | |
129 | i++; | |
130 | } | |
131 | } | |
132 | ||
133 | 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 | if(buf_end - buf < 16) { | |
138 | av_log(s->avctx, AV_LOG_WARNING, "truncated header\n"); | |
139 | return AVERROR_INVALIDDATA; | |
140 | } | |
141 | ||
142 | s->width = AV_RL16(&buf[4]); | |
143 | s->height = AV_RL16(&buf[6]); | |
144 | ||
145 | if (s->width != s->avctx->width || | |
146 | s->height != s->avctx->height) { | |
147 | av_frame_unref(s->last_frame); | |
148 | av_frame_unref(s->last2_frame); | |
149 | } | |
150 | ||
151 | ret = ff_set_dimensions(s->avctx, s->width, s->height); | |
152 | if (ret < 0) | |
153 | return ret; | |
154 | ||
155 | fps = AV_RL16(&buf[10]); | |
156 | if (fps > 0) | |
f6fa7814 | 157 | s->avctx->framerate = (AVRational){ fps, 1 }; |
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158 | |
159 | pal_start = AV_RL16(&buf[12]); | |
160 | pal_count = AV_RL16(&buf[14]); | |
161 | ||
162 | buf += 16; | |
163 | for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) { | |
164 | s->palette[i] = 0xFFU << 24 | AV_RB24(buf); | |
165 | buf += 3; | |
166 | } | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
171 | #define EA_PREAMBLE_SIZE 8 | |
172 | #define MVIh_TAG MKTAG('M', 'V', 'I', 'h') | |
173 | ||
174 | static int cmv_decode_frame(AVCodecContext *avctx, | |
175 | void *data, int *got_frame, | |
176 | AVPacket *avpkt) | |
177 | { | |
178 | const uint8_t *buf = avpkt->data; | |
179 | int buf_size = avpkt->size; | |
180 | CmvContext *s = avctx->priv_data; | |
181 | const uint8_t *buf_end = buf + buf_size; | |
182 | AVFrame *frame = data; | |
183 | int ret; | |
184 | ||
185 | if (buf_end - buf < EA_PREAMBLE_SIZE) | |
186 | return AVERROR_INVALIDDATA; | |
187 | ||
188 | if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) { | |
189 | unsigned size = AV_RL32(buf + 4); | |
190 | ret = cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end); | |
191 | if (ret < 0) | |
192 | return ret; | |
193 | if (size > buf_end - buf - EA_PREAMBLE_SIZE) | |
194 | return -1; | |
195 | buf += size; | |
196 | } | |
197 | ||
198 | if (av_image_check_size(s->width, s->height, 0, s->avctx)) | |
199 | return -1; | |
200 | ||
201 | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) | |
202 | return ret; | |
203 | ||
204 | memcpy(frame->data[1], s->palette, AVPALETTE_SIZE); | |
205 | ||
206 | buf += EA_PREAMBLE_SIZE; | |
207 | if ((buf[0]&1)) { // subtype | |
208 | cmv_decode_inter(s, frame, buf+2, buf_end); | |
209 | frame->key_frame = 0; | |
210 | frame->pict_type = AV_PICTURE_TYPE_P; | |
211 | }else{ | |
212 | frame->key_frame = 1; | |
213 | frame->pict_type = AV_PICTURE_TYPE_I; | |
214 | cmv_decode_intra(s, frame, buf+2, buf_end); | |
215 | } | |
216 | ||
217 | av_frame_unref(s->last2_frame); | |
218 | av_frame_move_ref(s->last2_frame, s->last_frame); | |
219 | if ((ret = av_frame_ref(s->last_frame, frame)) < 0) | |
220 | return ret; | |
221 | ||
222 | *got_frame = 1; | |
223 | ||
224 | return buf_size; | |
225 | } | |
226 | ||
227 | static av_cold int cmv_decode_end(AVCodecContext *avctx){ | |
228 | CmvContext *s = avctx->priv_data; | |
229 | ||
230 | av_frame_free(&s->last_frame); | |
231 | av_frame_free(&s->last2_frame); | |
232 | ||
233 | 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 = CODEC_CAP_DR1, | |
246 | }; |