lavc decoders: work with refcounted frames.
[libav.git] / libavcodec / cljr.c
1 /*
2 * Cirrus Logic AccuPak (CLJR) codec
3 * Copyright (c) 2003 Alex Beregszaszi
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 * Cirrus Logic AccuPak codec.
25 */
26
27 #include "avcodec.h"
28 #include "get_bits.h"
29 #include "internal.h"
30 #include "put_bits.h"
31
32 #if CONFIG_CLJR_DECODER
33 static int decode_frame(AVCodecContext *avctx,
34 void *data, int *got_frame,
35 AVPacket *avpkt)
36 {
37 const uint8_t *buf = avpkt->data;
38 int buf_size = avpkt->size;
39 GetBitContext gb;
40 AVFrame * const p = data;
41 int x, y, ret;
42
43 if (avctx->height <= 0 || avctx->width <= 0) {
44 av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");
45 return AVERROR_INVALIDDATA;
46 }
47
48 if (buf_size < avctx->height * avctx->width) {
49 av_log(avctx, AV_LOG_ERROR,
50 "Resolution larger than buffer size. Invalid header?\n");
51 return AVERROR_INVALIDDATA;
52 }
53
54 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
55 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
56 return ret;
57 }
58 p->pict_type = AV_PICTURE_TYPE_I;
59 p->key_frame = 1;
60
61 init_get_bits(&gb, buf, buf_size * 8);
62
63 for (y = 0; y < avctx->height; y++) {
64 uint8_t *luma = &p->data[0][y * p->linesize[0]];
65 uint8_t *cb = &p->data[1][y * p->linesize[1]];
66 uint8_t *cr = &p->data[2][y * p->linesize[2]];
67 for (x = 0; x < avctx->width; x += 4) {
68 luma[3] = get_bits(&gb, 5) << 3;
69 luma[2] = get_bits(&gb, 5) << 3;
70 luma[1] = get_bits(&gb, 5) << 3;
71 luma[0] = get_bits(&gb, 5) << 3;
72 luma += 4;
73 *(cb++) = get_bits(&gb, 6) << 2;
74 *(cr++) = get_bits(&gb, 6) << 2;
75 }
76 }
77
78 *got_frame = 1;
79
80 return buf_size;
81 }
82
83 static av_cold int decode_init(AVCodecContext *avctx)
84 {
85 avctx->pix_fmt = AV_PIX_FMT_YUV411P;
86 return 0;
87 }
88
89 AVCodec ff_cljr_decoder = {
90 .name = "cljr",
91 .type = AVMEDIA_TYPE_VIDEO,
92 .id = AV_CODEC_ID_CLJR,
93 .init = decode_init,
94 .decode = decode_frame,
95 .capabilities = CODEC_CAP_DR1,
96 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
97 };
98 #endif
99
100 #if CONFIG_CLJR_ENCODER
101 typedef struct CLJRContext {
102 AVFrame picture;
103 } CLJRContext;
104
105 static av_cold int encode_init(AVCodecContext *avctx)
106 {
107 CLJRContext * const a = avctx->priv_data;
108
109 avctx->coded_frame = &a->picture;
110
111 return 0;
112 }
113
114 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
115 const AVFrame *p, int *got_packet)
116 {
117 PutBitContext pb;
118 int x, y, ret;
119
120 if ((ret = ff_alloc_packet(pkt, 32*avctx->height*avctx->width/4)) < 0) {
121 av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
122 return ret;
123 }
124
125 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
126 avctx->coded_frame->key_frame = 1;
127
128 init_put_bits(&pb, pkt->data, pkt->size);
129
130 for (y = 0; y < avctx->height; y++) {
131 uint8_t *luma = &p->data[0][y * p->linesize[0]];
132 uint8_t *cb = &p->data[1][y * p->linesize[1]];
133 uint8_t *cr = &p->data[2][y * p->linesize[2]];
134 for (x = 0; x < avctx->width; x += 4) {
135 put_bits(&pb, 5, luma[3] >> 3);
136 put_bits(&pb, 5, luma[2] >> 3);
137 put_bits(&pb, 5, luma[1] >> 3);
138 put_bits(&pb, 5, luma[0] >> 3);
139 luma += 4;
140 put_bits(&pb, 6, *(cb++) >> 2);
141 put_bits(&pb, 6, *(cr++) >> 2);
142 }
143 }
144
145 flush_put_bits(&pb);
146
147 pkt->size = put_bits_count(&pb) / 8;
148 pkt->flags |= AV_PKT_FLAG_KEY;
149 *got_packet = 1;
150 return 0;
151 }
152
153 AVCodec ff_cljr_encoder = {
154 .name = "cljr",
155 .type = AVMEDIA_TYPE_VIDEO,
156 .id = AV_CODEC_ID_CLJR,
157 .priv_data_size = sizeof(CLJRContext),
158 .init = encode_init,
159 .encode2 = encode_frame,
160 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV411P,
161 AV_PIX_FMT_NONE },
162 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
163 };
164 #endif