ac3enc: Restructure DEBUG ifdefs to avoid unused function parameter warnings
[libav.git] / libavcodec / eacmv.c
CommitLineData
495900f7
PR
1/*
2 * Electronic Arts CMV Video Decoder
3 * Copyright (c) 2007-2008 Peter Ross
4 *
2912e87a 5 * This file is part of Libav.
495900f7 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
495900f7
PR
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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
495900f7
PR
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
2912e87a 18 * License along with Libav; if not, write to the Free Software
495900f7
PR
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
ba87f080 23 * @file
495900f7 24 * Electronic Arts CMV Video Decoder
8600106a 25 * by Peter Ross (pross@xvid.org)
495900f7
PR
26 *
27 * Technical details here:
28 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_CMV
29 */
30
1d9c2dc8 31#include "libavutil/common.h"
6a5d31ac 32#include "libavutil/intreadwrite.h"
737eb597 33#include "libavutil/imgutils.h"
495900f7 34#include "avcodec.h"
594d4d5d 35#include "internal.h"
495900f7
PR
36
37typedef struct CmvContext {
38 AVCodecContext *avctx;
759001c5
AK
39 AVFrame *last_frame; ///< last
40 AVFrame *last2_frame; ///< second-last
495900f7
PR
41 int width, height;
42 unsigned int palette[AVPALETTE_COUNT];
43} CmvContext;
44
45static av_cold int cmv_decode_init(AVCodecContext *avctx){
46 CmvContext *s = avctx->priv_data;
47 s->avctx = avctx;
716d413c 48 avctx->pix_fmt = AV_PIX_FMT_PAL8;
759001c5
AK
49
50 s->last_frame = av_frame_alloc();
51 s->last2_frame = av_frame_alloc();
52 if (!s->last_frame || !s->last2_frame) {
53 av_frame_free(&s->last_frame);
54 av_frame_free(&s->last2_frame);
55 return AVERROR(ENOMEM);
56 }
57
495900f7
PR
58 return 0;
59}
60
759001c5
AK
61static void cmv_decode_intra(CmvContext * s, AVFrame *frame,
62 const uint8_t *buf, const uint8_t *buf_end)
63{
64 unsigned char *dst = frame->data[0];
495900f7
PR
65 int i;
66
8df8a87e 67 for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
495900f7 68 memcpy(dst, buf, s->avctx->width);
759001c5 69 dst += frame->linesize[0];
495900f7
PR
70 buf += s->avctx->width;
71 }
72}
73
a339e919
DB
74static void cmv_motcomp(unsigned char *dst, ptrdiff_t dst_stride,
75 const unsigned char *src, ptrdiff_t src_stride,
495900f7
PR
76 int x, int y,
77 int xoffset, int yoffset,
78 int width, int height){
79 int i,j;
80
81 for(j=y;j<y+4;j++)
82 for(i=x;i<x+4;i++)
83 {
84 if (i+xoffset>=0 && i+xoffset<width &&
85 j+yoffset>=0 && j+yoffset<height) {
86 dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset];
87 }else{
88 dst[j*dst_stride + i] = 0;
89 }
90 }
91}
92
759001c5
AK
93static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf,
94 const uint8_t *buf_end)
95{
495900f7
PR
96 const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16);
97 int x,y,i;
98
99 i = 0;
100 for(y=0; y<s->avctx->height/4; y++)
8df8a87e 101 for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
495900f7 102 if (buf[i]==0xFF) {
759001c5 103 unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4;
495900f7
PR
104 if (raw+16<buf_end && *raw==0xFF) { /* intra */
105 raw++;
106 memcpy(dst, raw, 4);
759001c5
AK
107 memcpy(dst + frame->linesize[0], raw+4, 4);
108 memcpy(dst + 2 * frame->linesize[0], raw+8, 4);
109 memcpy(dst + 3 * frame->linesize[0], raw+12, 4);
495900f7
PR
110 raw+=16;
111 }else if(raw<buf_end) { /* inter using second-last frame as reference */
112 int xoffset = (*raw & 0xF) - 7;
113 int yoffset = ((*raw >> 4)) - 7;
759001c5
AK
114 if (s->last2_frame->data[0])
115 cmv_motcomp(frame->data[0], frame->linesize[0],
116 s->last2_frame->data[0], s->last2_frame->linesize[0],
cd426563 117 x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
495900f7
PR
118 raw++;
119 }
120 }else{ /* inter using last frame as reference */
121 int xoffset = (buf[i] & 0xF) - 7;
122 int yoffset = ((buf[i] >> 4)) - 7;
ea78a348
MS
123 if (s->last_frame->data[0])
124 cmv_motcomp(frame->data[0], frame->linesize[0],
125 s->last_frame->data[0], s->last_frame->linesize[0],
126 x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
495900f7
PR
127 }
128 i++;
129 }
130}
131
d6da3729 132static int cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
495900f7 133{
24057c83 134 int pal_start, pal_count, i, ret, fps;
495900f7 135
8df8a87e 136 if(buf_end - buf < 16) {
495900f7 137 av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
d6da3729 138 return AVERROR_INVALIDDATA;
495900f7
PR
139 }
140
141 s->width = AV_RL16(&buf[4]);
142 s->height = AV_RL16(&buf[6]);
d6da3729 143
54308391
AK
144 if (s->width != s->avctx->width ||
145 s->height != s->avctx->height) {
146 av_frame_unref(s->last_frame);
147 av_frame_unref(s->last2_frame);
148 }
149
d6da3729
AK
150 ret = ff_set_dimensions(s->avctx, s->width, s->height);
151 if (ret < 0)
152 return ret;
495900f7 153
24057c83
AK
154 fps = AV_RL16(&buf[10]);
155 if (fps > 0)
7ea1b347 156 s->avctx->framerate = (AVRational){ fps, 1 };
495900f7
PR
157
158 pal_start = AV_RL16(&buf[12]);
159 pal_count = AV_RL16(&buf[14]);
160
161 buf += 16;
8df8a87e 162 for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
495900f7
PR
163 s->palette[i] = AV_RB24(buf);
164 buf += 3;
165 }
d6da3729
AK
166
167 return 0;
495900f7
PR
168}
169
170#define EA_PREAMBLE_SIZE 8
171#define MVIh_TAG MKTAG('M', 'V', 'I', 'h')
172
173static int cmv_decode_frame(AVCodecContext *avctx,
df9b9567 174 void *data, int *got_frame,
7a00bbad 175 AVPacket *avpkt)
495900f7 176{
7a00bbad
TB
177 const uint8_t *buf = avpkt->data;
178 int buf_size = avpkt->size;
495900f7
PR
179 CmvContext *s = avctx->priv_data;
180 const uint8_t *buf_end = buf + buf_size;
759001c5
AK
181 AVFrame *frame = data;
182 int ret;
495900f7 183
46cb2f6a
LA
184 if (buf_end - buf < EA_PREAMBLE_SIZE)
185 return AVERROR_INVALIDDATA;
186
495900f7 187 if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) {
d6da3729
AK
188 ret = cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
189 if (ret < 0)
190 return ret;
495900f7
PR
191 return buf_size;
192 }
193
e16f217c 194 if (av_image_check_size(s->width, s->height, 0, s->avctx))
495900f7
PR
195 return -1;
196
759001c5 197 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
495900f7 198 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
759001c5 199 return ret;
495900f7
PR
200 }
201
759001c5 202 memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
495900f7
PR
203
204 buf += EA_PREAMBLE_SIZE;
205 if ((buf[0]&1)) { // subtype
759001c5
AK
206 cmv_decode_inter(s, frame, buf+2, buf_end);
207 frame->key_frame = 0;
208 frame->pict_type = AV_PICTURE_TYPE_P;
495900f7 209 }else{
759001c5
AK
210 frame->key_frame = 1;
211 frame->pict_type = AV_PICTURE_TYPE_I;
212 cmv_decode_intra(s, frame, buf+2, buf_end);
495900f7
PR
213 }
214
759001c5
AK
215 av_frame_unref(s->last2_frame);
216 av_frame_move_ref(s->last2_frame, s->last_frame);
217 if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
218 return ret;
219
df9b9567 220 *got_frame = 1;
495900f7
PR
221
222 return buf_size;
223}
224
225static av_cold int cmv_decode_end(AVCodecContext *avctx){
226 CmvContext *s = avctx->priv_data;
759001c5
AK
227
228 av_frame_free(&s->last_frame);
229 av_frame_free(&s->last2_frame);
495900f7
PR
230
231 return 0;
232}
233
d36beb3f 234AVCodec ff_eacmv_decoder = {
ec6402b7 235 .name = "eacmv",
b2bed932 236 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
ec6402b7 237 .type = AVMEDIA_TYPE_VIDEO,
36ef5369 238 .id = AV_CODEC_ID_CMV,
ec6402b7
AK
239 .priv_data_size = sizeof(CmvContext),
240 .init = cmv_decode_init,
241 .close = cmv_decode_end,
242 .decode = cmv_decode_frame,
def97856 243 .capabilities = AV_CODEC_CAP_DR1,
495900f7 244};