libavcodec/rawdec.c

   1 /*
   2  * Raw Video Decoder
   3  * Copyright (c) 2001 Fabrice Bellard
   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 /**
  23  * @file
  24  * Raw Video Decoder
  25  */
  26
  27 #include "avcodec.h"
  28 #include "raw.h"
  29 #include "libavutil/common.h"
  30 #include "libavutil/intreadwrite.h"
  31 #include "libavutil/imgutils.h"
  32
  33 typedef struct RawVideoContext {
  34     uint32_t palette[AVPALETTE_COUNT];
  35     unsigned char *buffer;  /* block of memory for holding one frame */
  36     int            length;  /* number of bytes in buffer */
  37     int flip;
  38     AVFrame pic;             ///< AVCodecContext.coded_frame
  39 } RawVideoContext;
  40
  41 static const PixelFormatTag pix_fmt_bps_avi[] = {
  42     { AV_PIX_FMT_PAL8,    4 },
  43     { AV_PIX_FMT_PAL8,    8 },
  44     { AV_PIX_FMT_RGB444, 12 },
  45     { AV_PIX_FMT_RGB555, 15 },
  46     { AV_PIX_FMT_RGB555, 16 },
  47     { AV_PIX_FMT_BGR24,  24 },
  48     { AV_PIX_FMT_RGB32,  32 },
  49     { AV_PIX_FMT_NONE,    0 },
  50 };
  51
  52 static const PixelFormatTag pix_fmt_bps_mov[] = {
  53     { AV_PIX_FMT_MONOWHITE, 1 },
  54     { AV_PIX_FMT_PAL8,      2 },
  55     { AV_PIX_FMT_PAL8,      4 },
  56     { AV_PIX_FMT_PAL8,      8 },
  57     // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
  58     // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
  59     { AV_PIX_FMT_RGB555BE, 16 },
  60     { AV_PIX_FMT_RGB24,    24 },
  61     { AV_PIX_FMT_ARGB,     32 },
  62     { AV_PIX_FMT_MONOWHITE,33 },
  63     { AV_PIX_FMT_NONE,      0 },
  64 };
  65
  66 static enum AVPixelFormat find_pix_fmt(const PixelFormatTag *tags,
  67                                        unsigned int fourcc)
  68 {
  69     while (tags->pix_fmt >= 0) {
  70         if (tags->fourcc == fourcc)
  71             return tags->pix_fmt;
  72         tags++;
  73     }
  74     return AV_PIX_FMT_YUV420P;
  75 }
  76
  77 static av_cold int raw_init_decoder(AVCodecContext *avctx)
  78 {
  79     RawVideoContext *context = avctx->priv_data;
  80
  81     if (avctx->codec_tag == MKTAG('r', 'a', 'w', ' '))
  82         avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_mov,
  83                                       avctx->bits_per_coded_sample);
  84     else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W'))
  85         avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi,
  86                                       avctx->bits_per_coded_sample);
  87     else if (avctx->codec_tag)
  88         avctx->pix_fmt = find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
  89     else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample)
  90         avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi,
  91                                       avctx->bits_per_coded_sample);
  92
  93     avpriv_set_systematic_pal2(context->palette, avctx->pix_fmt);
  94     context->length = avpicture_get_size(avctx->pix_fmt, avctx->width,
  95                                          avctx->height);
  96     if ((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
  97         avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
  98        (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))) {
  99         context->buffer = av_malloc(context->length);
 100         if (!context->buffer)
 101             return -1;
 102     }
 103     context->pic.pict_type = AV_PICTURE_TYPE_I;
 104     context->pic.key_frame = 1;
 105
 106     avctx->coded_frame = &context->pic;
 107
 108     if ((avctx->extradata_size >= 9 &&
 109          !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
 110         avctx->codec_tag == MKTAG(3, 0, 0, 0) ||
 111         avctx->codec_tag == MKTAG('W','R','A','W'))
 112         context->flip = 1;
 113
 114     return 0;
 115 }
 116
 117 static void flip(AVCodecContext *avctx, AVPicture *picture)
 118 {
 119     picture->data[0]     += picture->linesize[0] * (avctx->height - 1);
 120     picture->linesize[0] *= -1;
 121 }
 122
 123 static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
 124                       AVPacket *avpkt)
 125 {
 126     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
 127     RawVideoContext *context       = avctx->priv_data;
 128     const uint8_t *buf             = avpkt->data;
 129     int buf_size                   = avpkt->size;
 130     int res;
 131
 132     AVFrame   *frame   = data;
 133     AVPicture *picture = data;
 134
 135     frame->pict_type        = avctx->coded_frame->pict_type;
 136     frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
 137     frame->top_field_first  = avctx->coded_frame->top_field_first;
 138     frame->reordered_opaque = avctx->reordered_opaque;
 139     frame->pkt_pts          = avctx->pkt->pts;
 140
 141     if (buf_size < context->length - (avctx->pix_fmt == AV_PIX_FMT_PAL8 ?
 142                                       AVPALETTE_SIZE : 0))
 143         return -1;
 144
 145     //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
 146     if (context->buffer) {
 147         int i;
 148         uint8_t *dst = context->buffer;
 149         buf_size = context->length - AVPALETTE_SIZE;
 150         if (avctx->bits_per_coded_sample == 4) {
 151             for (i = 0; 2 * i + 1 < buf_size; i++) {
 152                 dst[2 * i + 0] = buf[i] >> 4;
 153                 dst[2 * i + 1] = buf[i] & 15;
 154             }
 155         } else {
 156             for (i = 0; 4 * i + 3 < buf_size; i++) {
 157                 dst[4 * i + 0] = buf[i] >> 6;
 158                 dst[4 * i + 1] = buf[i] >> 4 & 3;
 159                 dst[4 * i + 2] = buf[i] >> 2 & 3;
 160                 dst[4 * i + 3] = buf[i]      & 3;
 161             }
 162         }
 163         buf = dst;
 164     }
 165
 166     if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
 167         avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
 168         buf += buf_size - context->length;
 169
 170     if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,
 171                               avctx->width, avctx->height)) < 0)
 172         return res;
 173     if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->length) ||
 174         (desc->flags & PIX_FMT_PSEUDOPAL)) {
 175         frame->data[1] = context->palette;
 176     }
 177     if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
 178         const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE,
 179                                                      NULL);
 180
 181         if (pal) {
 182             memcpy(frame->data[1], pal, AVPALETTE_SIZE);
 183             frame->palette_has_changed = 1;
 184         }
 185     }
 186     if (avctx->pix_fmt == AV_PIX_FMT_BGR24 &&
 187         ((frame->linesize[0] + 3) & ~3) * avctx->height <= buf_size)
 188         frame->linesize[0] = (frame->linesize[0] + 3) & ~3;
 189
 190     if (context->flip)
 191         flip(avctx, picture);
 192
 193     if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2') ||
 194         avctx->codec_tag == MKTAG('Y', 'V', '1', '6') ||
 195         avctx->codec_tag == MKTAG('Y', 'V', '2', '4') ||
 196         avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
 197         FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
 198
 199     if (avctx->codec_tag == AV_RL32("yuv2") &&
 200         avctx->pix_fmt   == AV_PIX_FMT_YUYV422) {
 201         int x, y;
 202         uint8_t *line = picture->data[0];
 203         for (y = 0; y < avctx->height; y++) {
 204             for (x = 0; x < avctx->width; x++)
 205                 line[2 * x + 1] ^= 0x80;
 206             line += picture->linesize[0];
 207         }
 208     }
 209
 210     *got_frame = 1;
 211     return buf_size;
 212 }
 213
 214 static av_cold int raw_close_decoder(AVCodecContext *avctx)
 215 {
 216     RawVideoContext *context = avctx->priv_data;
 217
 218     av_freep(&context->buffer);
 219     return 0;
 220 }
 221
 222 AVCodec ff_rawvideo_decoder = {
 223     .name           = "rawvideo",
 224     .type           = AVMEDIA_TYPE_VIDEO,
 225     .id             = AV_CODEC_ID_RAWVIDEO,
 226     .priv_data_size = sizeof(RawVideoContext),
 227     .init           = raw_init_decoder,
 228     .close          = raw_close_decoder,
 229     .decode         = raw_decode,
 230     .long_name      = NULL_IF_CONFIG_SMALL("raw video"),
 231 };