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 "imgconvert.h"
  29 #include "raw.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     { PIX_FMT_PAL8,    4 },
  43     { PIX_FMT_PAL8,    8 },
  44     { PIX_FMT_RGB444, 12 },
  45     { PIX_FMT_RGB555, 15 },
  46     { PIX_FMT_RGB555, 16 },
  47     { PIX_FMT_BGR24,  24 },
  48     { PIX_FMT_RGB32,  32 },
  49     { PIX_FMT_NONE, 0 },
  50 };
  51
  52 static const PixelFormatTag pix_fmt_bps_mov[] = {
  53     { PIX_FMT_MONOWHITE, 1 },
  54     { PIX_FMT_PAL8,      2 },
  55     { PIX_FMT_PAL8,      4 },
  56     { 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     { PIX_FMT_RGB555BE, 16 },
  60     { PIX_FMT_RGB24,    24 },
  61     { PIX_FMT_ARGB,     32 },
  62     { PIX_FMT_MONOWHITE,33 },
  63     { PIX_FMT_NONE, 0 },
  64 };
  65
  66 static enum PixelFormat find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc)
  67 {
  68     while (tags->pix_fmt >= 0) {
  69         if (tags->fourcc == fourcc)
  70             return tags->pix_fmt;
  71         tags++;
  72     }
  73     return PIX_FMT_YUV420P;
  74 }
  75
  76 static av_cold int raw_init_decoder(AVCodecContext *avctx)
  77 {
  78     RawVideoContext *context = avctx->priv_data;
  79
  80     if (avctx->codec_tag == MKTAG('r','a','w',' '))
  81         avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_mov, avctx->bits_per_coded_sample);
  82     else if (avctx->codec_tag == MKTAG('W','R','A','W'))
  83         avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
  84     else if (avctx->codec_tag)
  85         avctx->pix_fmt = find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
  86     else if (avctx->pix_fmt == PIX_FMT_NONE && avctx->bits_per_coded_sample)
  87         avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
  88
  89     ff_set_systematic_pal2(context->palette, avctx->pix_fmt);
  90     context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
  91     if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
  92        avctx->pix_fmt==PIX_FMT_PAL8 &&
  93        (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
  94         context->buffer = av_malloc(context->length);
  95         if (!context->buffer)
  96             return -1;
  97     }
  98     context->pic.pict_type = AV_PICTURE_TYPE_I;
  99     context->pic.key_frame = 1;
 100
 101     avctx->coded_frame= &context->pic;
 102
 103     if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
 104         avctx->codec_tag == MKTAG(3, 0, 0, 0) || avctx->codec_tag == MKTAG('W','R','A','W'))
 105         context->flip=1;
 106
 107     return 0;
 108 }
 109
 110 static void flip(AVCodecContext *avctx, AVPicture * picture){
 111     picture->data[0] += picture->linesize[0] * (avctx->height-1);
 112     picture->linesize[0] *= -1;
 113 }
 114
 115 static int raw_decode(AVCodecContext *avctx,
 116                             void *data, int *data_size,
 117                             AVPacket *avpkt)
 118 {
 119     const uint8_t *buf = avpkt->data;
 120     int buf_size = avpkt->size;
 121     RawVideoContext *context = avctx->priv_data;
 122     int res;
 123
 124     AVFrame   *frame   = data;
 125     AVPicture *picture = data;
 126
 127     frame->pict_type        = avctx->coded_frame->pict_type;
 128     frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
 129     frame->top_field_first = avctx->coded_frame->top_field_first;
 130     frame->reordered_opaque = avctx->reordered_opaque;
 131     frame->pkt_pts          = avctx->pkt->pts;
 132
 133     if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
 134         return -1;
 135
 136     //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
 137     if (context->buffer) {
 138         int i;
 139         uint8_t *dst = context->buffer;
 140         buf_size = context->length - 256*4;
 141         if (avctx->bits_per_coded_sample == 4){
 142             for(i=0; 2*i+1 < buf_size; i++){
 143                 dst[2*i+0]= buf[i]>>4;
 144                 dst[2*i+1]= buf[i]&15;
 145             }
 146         } else
 147             for(i=0; 4*i+3 < buf_size; i++){
 148                 dst[4*i+0]= buf[i]>>6;
 149                 dst[4*i+1]= buf[i]>>4&3;
 150                 dst[4*i+2]= buf[i]>>2&3;
 151                 dst[4*i+3]= buf[i]   &3;
 152             }
 153         buf= dst;
 154     }
 155
 156     if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
 157        avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
 158         buf += buf_size - context->length;
 159
 160     if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,
 161                               avctx->width, avctx->height)) < 0)
 162         return res;
 163     if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) ||
 164        (av_pix_fmt_descriptors[avctx->pix_fmt].flags & PIX_FMT_PSEUDOPAL)) {
 165         frame->data[1]= context->palette;
 166     }
 167     if (avctx->pix_fmt == PIX_FMT_PAL8) {
 168         const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
 169
 170         if (pal) {
 171             memcpy(frame->data[1], pal, AVPALETTE_SIZE);
 172             frame->palette_has_changed = 1;
 173         }
 174     }
 175     if(avctx->pix_fmt==PIX_FMT_BGR24 && ((frame->linesize[0]+3)&~3)*avctx->height <= buf_size)
 176         frame->linesize[0] = (frame->linesize[0]+3)&~3;
 177
 178     if(context->flip)
 179         flip(avctx, picture);
 180
 181     if (   avctx->codec_tag == MKTAG('Y', 'V', '1', '2')
 182         || avctx->codec_tag == MKTAG('Y', 'V', '1', '6')
 183         || avctx->codec_tag == MKTAG('Y', 'V', '2', '4')
 184         || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
 185         FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
 186
 187     if(avctx->codec_tag == AV_RL32("yuv2") &&
 188        avctx->pix_fmt   == PIX_FMT_YUYV422) {
 189         int x, y;
 190         uint8_t *line = picture->data[0];
 191         for(y = 0; y < avctx->height; y++) {
 192             for(x = 0; x < avctx->width; x++)
 193                 line[2*x + 1] ^= 0x80;
 194             line += picture->linesize[0];
 195         }
 196     }
 197
 198     *data_size = sizeof(AVPicture);
 199     return buf_size;
 200 }
 201
 202 static av_cold int raw_close_decoder(AVCodecContext *avctx)
 203 {
 204     RawVideoContext *context = avctx->priv_data;
 205
 206     av_freep(&context->buffer);
 207     return 0;
 208 }
 209
 210 AVCodec ff_rawvideo_decoder = {
 211     .name           = "rawvideo",
 212     .type           = AVMEDIA_TYPE_VIDEO,
 213     .id             = CODEC_ID_RAWVIDEO,
 214     .priv_data_size = sizeof(RawVideoContext),
 215     .init           = raw_init_decoder,
 216     .close          = raw_close_decoder,
 217     .decode         = raw_decode,
 218     .long_name      = NULL_IF_CONFIG_SMALL("raw video"),
 219 };