Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / eacmv.c
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)
157 s->avctx->framerate = (AVRational){ fps, 1 };
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 };