lavc: fix decode_frame() third parameter semantics for video decoders
[libav.git] / libavcodec / dpx.c
1 /*
2 * DPX (.dpx) image decoder
3 * Copyright (c) 2009 Jimmy Christensen
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 #include "libavutil/intreadwrite.h"
23 #include "libavutil/imgutils.h"
24 #include "bytestream.h"
25 #include "avcodec.h"
26 #include "internal.h"
27
28 typedef struct DPXContext {
29 AVFrame picture;
30 } DPXContext;
31
32
33 static unsigned int read32(const uint8_t **ptr, int is_big)
34 {
35 unsigned int temp;
36 if (is_big) {
37 temp = AV_RB32(*ptr);
38 } else {
39 temp = AV_RL32(*ptr);
40 }
41 *ptr += 4;
42 return temp;
43 }
44
45 static inline unsigned make_16bit(unsigned value)
46 {
47 // mask away invalid bits
48 value &= 0xFFC0;
49 // correctly expand to 16 bits
50 return value + (value >> 10);
51 }
52
53 static int decode_frame(AVCodecContext *avctx,
54 void *data,
55 int *got_frame,
56 AVPacket *avpkt)
57 {
58 const uint8_t *buf = avpkt->data;
59 const uint8_t *buf_end = avpkt->data + avpkt->size;
60 int buf_size = avpkt->size;
61 DPXContext *const s = avctx->priv_data;
62 AVFrame *picture = data;
63 AVFrame *const p = &s->picture;
64 uint8_t *ptr;
65
66 unsigned int offset;
67 int magic_num, endian;
68 int x, y;
69 int w, h, stride, bits_per_color, descriptor, elements, target_packet_size, source_packet_size;
70
71 unsigned int rgbBuffer;
72
73 if (avpkt->size <= 1634) {
74 av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
75 return AVERROR_INVALIDDATA;
76 }
77
78 magic_num = AV_RB32(buf);
79 buf += 4;
80
81 /* Check if the files "magic number" is "SDPX" which means it uses
82 * big-endian or XPDS which is for little-endian files */
83 if (magic_num == AV_RL32("SDPX")) {
84 endian = 0;
85 } else if (magic_num == AV_RB32("SDPX")) {
86 endian = 1;
87 } else {
88 av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
89 return -1;
90 }
91
92 offset = read32(&buf, endian);
93 if (avpkt->size <= offset) {
94 av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
95 return AVERROR_INVALIDDATA;
96 }
97 // Need to end in 0x304 offset from start of file
98 buf = avpkt->data + 0x304;
99 w = read32(&buf, endian);
100 h = read32(&buf, endian);
101
102 // Need to end in 0x320 to read the descriptor
103 buf += 20;
104 descriptor = buf[0];
105
106 // Need to end in 0x323 to read the bits per color
107 buf += 3;
108 avctx->bits_per_raw_sample =
109 bits_per_color = buf[0];
110
111 buf += 825;
112 avctx->sample_aspect_ratio.num = read32(&buf, endian);
113 avctx->sample_aspect_ratio.den = read32(&buf, endian);
114
115 switch (descriptor) {
116 case 51: // RGBA
117 elements = 4;
118 break;
119 case 50: // RGB
120 elements = 3;
121 break;
122 default:
123 av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
124 return -1;
125 }
126
127 switch (bits_per_color) {
128 case 8:
129 if (elements == 4) {
130 avctx->pix_fmt = AV_PIX_FMT_RGBA;
131 } else {
132 avctx->pix_fmt = AV_PIX_FMT_RGB24;
133 }
134 source_packet_size = elements;
135 target_packet_size = elements;
136 break;
137 case 10:
138 avctx->pix_fmt = AV_PIX_FMT_RGB48;
139 target_packet_size = 6;
140 source_packet_size = 4;
141 break;
142 case 12:
143 case 16:
144 if (endian) {
145 avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
146 } else {
147 avctx->pix_fmt = AV_PIX_FMT_RGB48LE;
148 }
149 target_packet_size = 6;
150 source_packet_size = elements * 2;
151 break;
152 default:
153 av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
154 return -1;
155 }
156
157 if (s->picture.data[0])
158 avctx->release_buffer(avctx, &s->picture);
159 if (av_image_check_size(w, h, 0, avctx))
160 return -1;
161 if (w != avctx->width || h != avctx->height)
162 avcodec_set_dimensions(avctx, w, h);
163 if (ff_get_buffer(avctx, p) < 0) {
164 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
165 return -1;
166 }
167
168 // Move pointer to offset from start of file
169 buf = avpkt->data + offset;
170
171 ptr = p->data[0];
172 stride = p->linesize[0];
173
174 if (source_packet_size*avctx->width*avctx->height > buf_end - buf) {
175 av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
176 return -1;
177 }
178 switch (bits_per_color) {
179 case 10:
180 for (x = 0; x < avctx->height; x++) {
181 uint16_t *dst = (uint16_t*)ptr;
182 for (y = 0; y < avctx->width; y++) {
183 rgbBuffer = read32(&buf, endian);
184 // Read out the 10-bit colors and convert to 16-bit
185 *dst++ = make_16bit(rgbBuffer >> 16);
186 *dst++ = make_16bit(rgbBuffer >> 6);
187 *dst++ = make_16bit(rgbBuffer << 4);
188 }
189 ptr += stride;
190 }
191 break;
192 case 8:
193 case 12: // Treat 12-bit as 16-bit
194 case 16:
195 if (source_packet_size == target_packet_size) {
196 for (x = 0; x < avctx->height; x++) {
197 memcpy(ptr, buf, target_packet_size*avctx->width);
198 ptr += stride;
199 buf += source_packet_size*avctx->width;
200 }
201 } else {
202 for (x = 0; x < avctx->height; x++) {
203 uint8_t *dst = ptr;
204 for (y = 0; y < avctx->width; y++) {
205 memcpy(dst, buf, target_packet_size);
206 dst += target_packet_size;
207 buf += source_packet_size;
208 }
209 ptr += stride;
210 }
211 }
212 break;
213 }
214
215 *picture = s->picture;
216 *got_frame = 1;
217
218 return buf_size;
219 }
220
221 static av_cold int decode_init(AVCodecContext *avctx)
222 {
223 DPXContext *s = avctx->priv_data;
224 avcodec_get_frame_defaults(&s->picture);
225 avctx->coded_frame = &s->picture;
226 return 0;
227 }
228
229 static av_cold int decode_end(AVCodecContext *avctx)
230 {
231 DPXContext *s = avctx->priv_data;
232 if (s->picture.data[0])
233 avctx->release_buffer(avctx, &s->picture);
234
235 return 0;
236 }
237
238 AVCodec ff_dpx_decoder = {
239 .name = "dpx",
240 .type = AVMEDIA_TYPE_VIDEO,
241 .id = AV_CODEC_ID_DPX,
242 .priv_data_size = sizeof(DPXContext),
243 .init = decode_init,
244 .close = decode_end,
245 .decode = decode_frame,
246 .long_name = NULL_IF_CONFIG_SMALL("DPX image"),
247 .capabilities = CODEC_CAP_DR1,
248 };