FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
v210dec.c
Go to the documentation of this file.
1 /*
2  * V210 decoder
3  *
4  * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
5  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include "avcodec.h"
25 #include "internal.h"
26 #include "v210dec.h"
27 #include "libavutil/bswap.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/mem.h"
30 
31 #define READ_PIXELS(a, b, c) \
32  do { \
33  val = av_le2ne32(*src++); \
34  *a++ = val & 0x3FF; \
35  *b++ = (val >> 10) & 0x3FF; \
36  *c++ = (val >> 20) & 0x3FF; \
37  } while (0)
38 
39 static void v210_planar_unpack_c(const uint32_t *src, uint16_t *y, uint16_t *u, uint16_t *v, int width)
40 {
41  uint32_t val;
42  int i;
43 
44  for( i = 0; i < width-5; i += 6 ){
45  READ_PIXELS(u, y, v);
46  READ_PIXELS(y, u, y);
47  READ_PIXELS(v, y, u);
48  READ_PIXELS(y, v, y);
49  }
50 }
51 
53 {
54  V210DecContext *s = avctx->priv_data;
55 
56  if (avctx->width & 1) {
57  av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
58  return AVERROR_INVALIDDATA;
59  }
61  avctx->bits_per_raw_sample = 10;
62 
64  if (!avctx->coded_frame)
65  return AVERROR(ENOMEM);
66 
68 
69  if (HAVE_MMX)
70  v210_x86_init(s);
71 
72  return 0;
73 }
74 
75 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
76  AVPacket *avpkt)
77 {
78  V210DecContext *s = avctx->priv_data;
79 
80  int h, w, ret, stride, aligned_input;
81  AVFrame *pic = avctx->coded_frame;
82  const uint8_t *psrc = avpkt->data;
83  uint16_t *y, *u, *v;
84 
85  if (s->custom_stride )
86  stride = s->custom_stride;
87  else {
88  int aligned_width = ((avctx->width + 47) / 48) * 48;
89  stride = aligned_width * 8 / 3;
90  }
91 
92  if (avpkt->size < stride * avctx->height) {
93  if ((((avctx->width + 23) / 24) * 24 * 8) / 3 * avctx->height == avpkt->size) {
94  stride = avpkt->size / avctx->height;
95  if (!s->stride_warning_shown)
96  av_log(avctx, AV_LOG_WARNING, "Broken v210 with too small padding (64 byte) detected\n");
97  s->stride_warning_shown = 1;
98  } else {
99  av_log(avctx, AV_LOG_ERROR, "packet too small\n");
100  return AVERROR_INVALIDDATA;
101  }
102  }
103 
104  aligned_input = !((uintptr_t)psrc & 0xf) && !(stride & 0xf);
105  if (aligned_input != s->aligned_input) {
106  s->aligned_input = aligned_input;
107  if (HAVE_MMX)
108  v210_x86_init(s);
109  }
110 
111  if (pic->data[0])
112  avctx->release_buffer(avctx, pic);
113 
114  pic->reference = 0;
115  if ((ret = ff_get_buffer(avctx, pic)) < 0)
116  return ret;
117 
118  y = (uint16_t*)pic->data[0];
119  u = (uint16_t*)pic->data[1];
120  v = (uint16_t*)pic->data[2];
122  pic->key_frame = 1;
123 
124  for (h = 0; h < avctx->height; h++) {
125  const uint32_t *src = (const uint32_t*)psrc;
126  uint32_t val;
127 
128  w = (avctx->width / 6) * 6;
129  s->unpack_frame(src, y, u, v, w);
130 
131  y += w;
132  u += w >> 1;
133  v += w >> 1;
134  src += (w << 1) / 3;
135 
136  if (w < avctx->width - 1) {
137  READ_PIXELS(u, y, v);
138 
139  val = av_le2ne32(*src++);
140  *y++ = val & 0x3FF;
141  if (w < avctx->width - 3) {
142  *u++ = (val >> 10) & 0x3FF;
143  *y++ = (val >> 20) & 0x3FF;
144 
145  val = av_le2ne32(*src++);
146  *v++ = val & 0x3FF;
147  *y++ = (val >> 10) & 0x3FF;
148  }
149  }
150 
151  psrc += stride;
152  y += pic->linesize[0] / 2 - avctx->width;
153  u += pic->linesize[1] / 2 - avctx->width / 2;
154  v += pic->linesize[2] / 2 - avctx->width / 2;
155  }
156 
157  *got_frame = 1;
158  *(AVFrame*)data = *avctx->coded_frame;
159 
160  return avpkt->size;
161 }
162 
164 {
165  AVFrame *pic = avctx->coded_frame;
166  if (pic->data[0])
167  avctx->release_buffer(avctx, pic);
168  av_freep(&avctx->coded_frame);
169 
170  return 0;
171 }
172 
173 #define V210DEC_FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
174 static const AVOption v210dec_options[] = {
175  {"custom_stride", "Custom V210 stride", offsetof(V210DecContext, custom_stride), FF_OPT_TYPE_INT,
176  {.i64 = 0}, INT_MIN, INT_MAX, V210DEC_FLAGS},
177  {NULL}
178 };
179 
180 static const AVClass v210dec_class = {
181  "V210 Decoder",
185 };
186 
188  .name = "v210",
189  .type = AVMEDIA_TYPE_VIDEO,
190  .id = AV_CODEC_ID_V210,
191  .priv_data_size = sizeof(V210DecContext),
192  .init = decode_init,
193  .close = decode_close,
194  .decode = decode_frame,
195  .capabilities = CODEC_CAP_DR1,
196  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
197  .priv_class = &v210dec_class,
198 };