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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.     if (avctx->field_order > AV_FIELD_PROGRESSIVE) {
  150.         /* we have interlaced material flagged in container */
  151.         pic->interlaced_frame = 1;
  152.         if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
  153.             pic->top_field_first = 1;
  154.     }
  155.  
  156.     *got_frame      = 1;
  157.  
  158.     return avpkt->size;
  159. }
  160.  
  161. #define V210DEC_FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
  162. static const AVOption v210dec_options[] = {
  163.     {"custom_stride", "Custom V210 stride", offsetof(V210DecContext, custom_stride), FF_OPT_TYPE_INT,
  164.      {.i64 = 0}, INT_MIN, INT_MAX, V210DEC_FLAGS},
  165.     {NULL}
  166. };
  167.  
  168. static const AVClass v210dec_class = {
  169.     "V210 Decoder",
  170.     av_default_item_name,
  171.     v210dec_options,
  172.     LIBAVUTIL_VERSION_INT,
  173. };
  174.  
  175. AVCodec ff_v210_decoder = {
  176.     .name           = "v210",
  177.     .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
  178.     .type           = AVMEDIA_TYPE_VIDEO,
  179.     .id             = AV_CODEC_ID_V210,
  180.     .priv_data_size = sizeof(V210DecContext),
  181.     .init           = decode_init,
  182.     .decode         = decode_frame,
  183.     .capabilities   = CODEC_CAP_DR1,
  184.     .priv_class     = &v210dec_class,
  185. };
  186.