FFmpeg: libavcodec/v210dec.c Source File

FFmpeg
v210dec.c
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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 
52  static av_cold int decode_init(AVCodecContext *avctx)
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  }
60  avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
61  avctx->bits_per_raw_sample = 10;
62 
63  s->unpack_frame = v210_planar_unpack_c;
64 
65  if (HAVE_MMX)
66  v210_x86_init(s);
67 
68  return 0;
69 }
70 
71  static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
72  AVPacket *avpkt)
73 {
74  V210DecContext *s = avctx->priv_data;
75 
76  int h, w, ret, stride, aligned_input;
77  AVFrame *pic = data;
78  const uint8_t *psrc = avpkt->data;
79  uint16_t *y, *u, *v;
80 
81  if (s->custom_stride )
82  stride = s->custom_stride;
83  else {
84  int aligned_width = ((avctx->width + 47) / 48) * 48;
85  stride = aligned_width * 8 / 3;
86  }
87 
88  if (avpkt->size < stride * avctx->height) {
89  if ((((avctx->width + 23) / 24) * 24 * 8) / 3 * avctx->height == avpkt->size) {
90  stride = avpkt->size / avctx->height;
91  if (!s->stride_warning_shown)
92  av_log(avctx, AV_LOG_WARNING, "Broken v210 with too small padding (64 byte) detected\n");
93  s->stride_warning_shown = 1;
94  } else {
95  av_log(avctx, AV_LOG_ERROR, "packet too small\n");
96  return AVERROR_INVALIDDATA;
97  }
98  }
99 
100  aligned_input = !((uintptr_t)psrc & 0xf) && !(stride & 0xf);
101  if (aligned_input != s->aligned_input) {
102  s->aligned_input = aligned_input;
103  if (HAVE_MMX)
104  v210_x86_init(s);
105  }
106 
107  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
108  return ret;
109 
110  y = (uint16_t*)pic->data[0];
111  u = (uint16_t*)pic->data[1];
112  v = (uint16_t*)pic->data[2];
113  pic->pict_type = AV_PICTURE_TYPE_I;
114  pic->key_frame = 1;
115 
116  for (h = 0; h < avctx->height; h++) {
117  const uint32_t *src = (const uint32_t*)psrc;
118  uint32_t val;
119 
120  w = (avctx->width / 6) * 6;
121  s->unpack_frame(src, y, u, v, w);
122 
123  y += w;
124  u += w >> 1;
125  v += w >> 1;
126  src += (w << 1) / 3;
127 
128  if (w < avctx->width - 1) {
129  READ_PIXELS(u, y, v);
130 
131  val = av_le2ne32(*src++);
132  *y++ = val & 0x3FF;
133  if (w < avctx->width - 3) {
134  *u++ = (val >> 10) & 0x3FF;
135  *y++ = (val >> 20) & 0x3FF;
136 
137  val = av_le2ne32(*src++);
138  *v++ = val & 0x3FF;
139  *y++ = (val >> 10) & 0x3FF;
140  }
141  }
142 
143  psrc += stride;
144  y += pic->linesize[0] / 2 - avctx->width;
145  u += pic->linesize[1] / 2 - avctx->width / 2;
146  v += pic->linesize[2] / 2 - avctx->width / 2;
147  }
148 
149  *got_frame = 1;
150 
151  return avpkt->size;
152 }
153 
154  #define V210DEC_FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
155  static const AVOption v210dec_options[] = {
156  {"custom_stride", "Custom V210 stride", offsetof(V210DecContext, custom_stride), FF_OPT_TYPE_INT,
157  {.i64 = 0}, INT_MIN, INT_MAX, V210DEC_FLAGS},
158  {NULL}
159 };
160 
161  static const AVClass v210dec_class = {
162  "V210 Decoder",
163  av_default_item_name,
164  v210dec_options,
165  LIBAVUTIL_VERSION_INT,
166 };
167 
168  AVCodec ff_v210_decoder = {
169  .name = "v210",
170  .type = AVMEDIA_TYPE_VIDEO,
171  .id = AV_CODEC_ID_V210,
172  .priv_data_size = sizeof(V210DecContext),
173  .init = decode_init,
174  .decode = decode_frame,
175  .capabilities = CODEC_CAP_DR1,
176  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
177  .priv_class = &v210dec_class,
178 };
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