xref: /third_party/ffmpeg/libavcodec/jvdec.c (revision cabdff1a) 
1/*
2 * Bitmap Brothers JV video decoder
3 * Copyright (c) 2011 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * Bitmap Brothers JV video decoder
25 * @author Peter Ross <pross@xvid.org>
26 */
27
28#include "libavutil/intreadwrite.h"
29
30#include "avcodec.h"
31#include "blockdsp.h"
32#include "codec_internal.h"
33#include "get_bits.h"
34#include "internal.h"
35
36typedef struct JvContext {
37    BlockDSPContext bdsp;
38    AVFrame   *frame;
39    uint32_t   palette[AVPALETTE_COUNT];
40    int        palette_has_changed;
41} JvContext;
42
43static av_cold int decode_init(AVCodecContext *avctx)
44{
45    JvContext *s = avctx->priv_data;
46
47    if (!avctx->width || !avctx->height ||
48        (avctx->width & 7) || (avctx->height & 7)) {
49        av_log(avctx, AV_LOG_ERROR, "Invalid video dimensions: %dx%d\n",
50               avctx->width, avctx->height);
51        return AVERROR(EINVAL);
52    }
53
54    s->frame = av_frame_alloc();
55    if (!s->frame)
56        return AVERROR(ENOMEM);
57
58    avctx->pix_fmt = AV_PIX_FMT_PAL8;
59    ff_blockdsp_init(&s->bdsp, avctx);
60    return 0;
61}
62
63/**
64 * Decode 2x2 block
65 */
66static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
67{
68    int i, j, v[2];
69
70    switch (get_bits(gb, 2)) {
71    case 1:
72        v[0] = get_bits(gb, 8);
73        for (j = 0; j < 2; j++)
74            memset(dst + j * linesize, v[0], 2);
75        break;
76    case 2:
77        v[0] = get_bits(gb, 8);
78        v[1] = get_bits(gb, 8);
79        for (j = 0; j < 2; j++)
80            for (i = 0; i < 2; i++)
81                dst[j * linesize + i] = v[get_bits1(gb)];
82        break;
83    case 3:
84        for (j = 0; j < 2; j++)
85            for (i = 0; i < 2; i++)
86                dst[j * linesize + i] = get_bits(gb, 8);
87    }
88}
89
90/**
91 * Decode 4x4 block
92 */
93static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
94{
95    int i, j, v[2];
96
97    switch (get_bits(gb, 2)) {
98    case 1:
99        v[0] = get_bits(gb, 8);
100        for (j = 0; j < 4; j++)
101            memset(dst + j * linesize, v[0], 4);
102        break;
103    case 2:
104        v[0] = get_bits(gb, 8);
105        v[1] = get_bits(gb, 8);
106        for (j = 2; j >= 0; j -= 2) {
107            for (i = 0; i < 4; i++)
108                dst[j * linesize + i] = v[get_bits1(gb)];
109            for (i = 0; i < 4; i++)
110                dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
111        }
112        break;
113    case 3:
114        for (j = 0; j < 4; j += 2)
115            for (i = 0; i < 4; i += 2)
116                decode2x2(gb, dst + j * linesize + i, linesize);
117    }
118}
119
120/**
121 * Decode 8x8 block
122 */
123static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
124                             BlockDSPContext *bdsp)
125{
126    int i, j, v[2];
127
128    switch (get_bits(gb, 2)) {
129    case 1:
130        v[0] = get_bits(gb, 8);
131        bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
132        break;
133    case 2:
134        v[0] = get_bits(gb, 8);
135        v[1] = get_bits(gb, 8);
136        for (j = 7; j >= 0; j--)
137            for (i = 0; i < 8; i++)
138                dst[j * linesize + i] = v[get_bits1(gb)];
139        break;
140    case 3:
141        for (j = 0; j < 8; j += 4)
142            for (i = 0; i < 8; i += 4)
143                decode4x4(gb, dst + j * linesize + i, linesize);
144    }
145}
146
147static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
148                        int *got_frame, AVPacket *avpkt)
149{
150    JvContext *s = avctx->priv_data;
151    const uint8_t *buf = avpkt->data;
152    const uint8_t *buf_end = buf + avpkt->size;
153    int video_size, video_type, i, j, ret;
154
155    if (avpkt->size < 6)
156        return AVERROR_INVALIDDATA;
157
158    video_size = AV_RL32(buf);
159    video_type = buf[4];
160    buf += 5;
161
162    if (video_size) {
163        if (video_size < 0 || video_size > avpkt->size - 5) {
164            av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
165            return AVERROR_INVALIDDATA;
166        }
167
168        if (video_type == 0 || video_type == 1) {
169            GetBitContext gb;
170            init_get_bits(&gb, buf, 8 * video_size);
171
172            if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
173                return ret;
174
175            if (avctx->height/8 * (avctx->width/8) > 4 * video_size) {
176                av_log(avctx, AV_LOG_ERROR, "Insufficient input data for dimensions\n");
177                return AVERROR_INVALIDDATA;
178            }
179
180            for (j = 0; j < avctx->height; j += 8)
181                for (i = 0; i < avctx->width; i += 8)
182                    decode8x8(&gb,
183                              s->frame->data[0] + j * s->frame->linesize[0] + i,
184                              s->frame->linesize[0], &s->bdsp);
185
186            buf += video_size;
187        } else if (video_type == 2) {
188            int v = *buf++;
189
190            av_frame_unref(s->frame);
191            if ((ret = ff_get_buffer(avctx, s->frame, AV_GET_BUFFER_FLAG_REF)) < 0)
192                return ret;
193
194            for (j = 0; j < avctx->height; j++)
195                memset(s->frame->data[0] + j * s->frame->linesize[0],
196                       v, avctx->width);
197        } else {
198            av_log(avctx, AV_LOG_WARNING,
199                   "unsupported frame type %i\n", video_type);
200            return AVERROR_INVALIDDATA;
201        }
202    }
203
204    if (buf_end - buf >= AVPALETTE_COUNT * 3) {
205        for (i = 0; i < AVPALETTE_COUNT; i++) {
206            uint32_t pal = AV_RB24(buf);
207            s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
208            buf += 3;
209        }
210        s->palette_has_changed = 1;
211    }
212
213    if (video_size) {
214        s->frame->key_frame           = 1;
215        s->frame->pict_type           = AV_PICTURE_TYPE_I;
216        s->frame->palette_has_changed = s->palette_has_changed;
217        s->palette_has_changed        = 0;
218        memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
219
220        if ((ret = av_frame_ref(rframe, s->frame)) < 0)
221            return ret;
222        *got_frame = 1;
223    }
224
225    return avpkt->size;
226}
227
228static av_cold int decode_close(AVCodecContext *avctx)
229{
230    JvContext *s = avctx->priv_data;
231
232    av_frame_free(&s->frame);
233
234    return 0;
235}
236
237const FFCodec ff_jv_decoder = {
238    .p.name         = "jv",
239    .p.long_name    = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
240    .p.type         = AVMEDIA_TYPE_VIDEO,
241    .p.id           = AV_CODEC_ID_JV,
242    .priv_data_size = sizeof(JvContext),
243    .init           = decode_init,
244    .close          = decode_close,
245    FF_CODEC_DECODE_CB(decode_frame),
246    .p.capabilities = AV_CODEC_CAP_DR1,
247    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
248};
249