Add the prefix "av_" to img_crop(), img_copy() and img_pad(), and rename "img"
[libav.git] / libavcodec / nuv.c
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1/*
2 * NuppelVideo decoder
3 * Copyright (c) 2006 Reimar Doeffinger
4 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
dfca23e3 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
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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
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21#include <stdio.h>
22#include <stdlib.h>
23
24#include "common.h"
25#include "avcodec.h"
26
27#include "bswap.h"
28#include "dsputil.h"
29#include "lzo.h"
30#include "rtjpeg.h"
31
32typedef struct {
33 AVFrame pic;
34 int width, height;
35 unsigned int decomp_size;
36 unsigned char* decomp_buf;
37 uint32_t lq[64], cq[64];
38 RTJpegContext rtj;
39 DSPContext dsp;
40} NuvContext;
41
42/**
43 * \brief copy frame data from buffer to AVFrame, handling stride.
44 * \param f destination AVFrame
45 * \param src source buffer, does not use any line-stride
46 * \param width width of the video frame
47 * \param height height of the video frame
48 */
49static void copy_frame(AVFrame *f, uint8_t *src,
50 int width, int height) {
51 AVPicture pic;
52 avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height);
636d6a4a 53 av_picture_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height);
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54}
55
56/**
57 * \brief extract quantization tables from codec data into our context
58 */
59static int get_quant(AVCodecContext *avctx, NuvContext *c,
60 uint8_t *buf, int size) {
61 int i;
62 if (size < 2 * 64 * 4) {
63 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
64 return -1;
65 }
66 for (i = 0; i < 64; i++, buf += 4)
fead30d4 67 c->lq[i] = AV_RL32(buf);
dfca23e3 68 for (i = 0; i < 64; i++, buf += 4)
fead30d4 69 c->cq[i] = AV_RL32(buf);
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70 return 0;
71}
72
73static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
74 uint8_t *buf, int buf_size) {
75 NuvContext *c = (NuvContext *)avctx->priv_data;
76 AVFrame *picture = data;
77 int orig_size = buf_size;
78 enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
79 NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
80 NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
81
82 if (buf_size < 12) {
83 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
84 return -1;
85 }
86
87 if (c->pic.data[0])
88 avctx->release_buffer(avctx, &c->pic);
89 c->pic.reference = 1;
90 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
91 FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
92 if (avctx->get_buffer(avctx, &c->pic) < 0) {
93 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
94 return -1;
95 }
96
97 // codec data (rtjpeg quant tables)
98 if (buf[0] == 'D' && buf[1] == 'R') {
99 int ret;
100 // skip rest of the frameheader.
101 buf = &buf[12];
102 buf_size -= 12;
103 ret = get_quant(avctx, c, buf, buf_size);
104 if (ret < 0)
105 return ret;
106 rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
107 return orig_size;
108 }
109
110 if (buf[0] != 'V' || buf_size < 12) {
111 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
112 return -1;
113 }
114 comptype = buf[1];
115 // skip rest of the frameheader.
116 buf = &buf[12];
117 buf_size -= 12;
118
119 c->pic.pict_type = FF_I_TYPE;
120 c->pic.key_frame = 1;
121 // decompress/copy/whatever data
122 switch (comptype) {
123 case NUV_UNCOMPRESSED: {
124 int height = c->height;
125 if (buf_size < c->width * height * 3 / 2) {
126 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
127 height = buf_size / c->width / 3 * 2;
128 }
129 copy_frame(&c->pic, buf, c->width, height);
130 break;
131 }
132 case NUV_RTJPEG: {
133 rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
134 break;
135 }
136 case NUV_RTJPEG_IN_LZO: {
137 int outlen = c->decomp_size, inlen = buf_size;
138 if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
139 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
140 rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, c->decomp_buf, c->decomp_size);
141 break;
142 }
143 case NUV_LZO: {
144 int outlen = c->decomp_size, inlen = buf_size;
145 if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
146 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
147 copy_frame(&c->pic, c->decomp_buf, c->width, c->height);
148 break;
149 }
150 case NUV_BLACK: {
151 memset(c->pic.data[0], 0, c->width * c->height);
152 memset(c->pic.data[1], 128, c->width * c->height / 4);
153 memset(c->pic.data[2], 128, c->width * c->height / 4);
154 break;
155 }
156 case NUV_COPY_LAST: {
157 c->pic.pict_type = FF_P_TYPE;
158 c->pic.key_frame = 0;
159 /* nothing more to do here */
160 break;
161 }
162 default:
163 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
164 return -1;
165 }
166
167 *picture = c->pic;
168 *data_size = sizeof(AVFrame);
169 return orig_size;
170}
171
172static int decode_init(AVCodecContext *avctx) {
173 NuvContext *c = (NuvContext *)avctx->priv_data;
174 avctx->width = (avctx->width + 1) & ~1;
175 avctx->height = (avctx->height + 1) & ~1;
176 if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
177 return 1;
178 }
179 avctx->has_b_frames = 0;
180 avctx->pix_fmt = PIX_FMT_YUV420P;
181 c->pic.data[0] = NULL;
182 c->width = avctx->width;
183 c->height = avctx->height;
184 c->decomp_size = c->height * c->width * 3 / 2;
185 c->decomp_buf = av_malloc(c->decomp_size + LZO_OUTPUT_PADDING);
186 if (!c->decomp_buf) {
187 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
188 return 1;
189 }
190 dsputil_init(&c->dsp, avctx);
191 if (avctx->extradata_size)
192 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
193 rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
194 return 0;
195}
196
197static int decode_end(AVCodecContext *avctx) {
198 NuvContext *c = (NuvContext *)avctx->priv_data;
199 av_freep(&c->decomp_buf);
200 if (c->pic.data[0])
201 avctx->release_buffer(avctx, &c->pic);
202 return 0;
203}
204
205AVCodec nuv_decoder = {
206 "nuv",
207 CODEC_TYPE_VIDEO,
208 CODEC_ID_NUV,
209 sizeof(NuvContext),
210 decode_init,
211 NULL,
212 decode_end,
213 decode_frame,
214 CODEC_CAP_DR1,
215};
216