libavcodec/raw.c

   1 /*
   2  * Raw Video Codec
   3  * Copyright (c) 2001 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 /**
  21  * @file raw.c
  22  * Raw Video Codec
  23  */
  24
  25 #include "avcodec.h"
  26
  27 typedef struct RawVideoContext {
  28     unsigned char * buffer;  /* block of memory for holding one frame */
  29     int             length;  /* number of bytes in buffer */
  30     AVFrame pic;             ///< AVCodecContext.coded_frame
  31 } RawVideoContext;
  32
  33 typedef struct PixelFormatTag {
  34     int pix_fmt;
  35     unsigned int fourcc;
  36 } PixelFormatTag;
  37
  38 const PixelFormatTag pixelFormatTags[] = {
  39     { PIX_FMT_YUV420P, MKTAG('I', '4', '2', '0') }, /* Planar formats */
  40     { PIX_FMT_YUV420P, MKTAG('I', 'Y', 'U', 'V') },
  41     { PIX_FMT_YUV410P, MKTAG('Y', 'U', 'V', '9') },
  42     { PIX_FMT_YUV411P, MKTAG('Y', '4', '1', 'B') },
  43     { PIX_FMT_YUV422P, MKTAG('Y', '4', '2', 'B') },
  44     { PIX_FMT_GRAY8,   MKTAG('Y', '8', '0', '0') },
  45     { PIX_FMT_GRAY8,   MKTAG(' ', ' ', 'Y', '8') },
  46
  47
  48     { PIX_FMT_YUV422,  MKTAG('Y', 'U', 'Y', '2') }, /* Packed formats */
  49     { PIX_FMT_YUV422,  MKTAG('Y', '4', '2', '2') },
  50     { PIX_FMT_UYVY422, MKTAG('U', 'Y', 'V', 'Y') },
  51     { PIX_FMT_GRAY8,   MKTAG('G', 'R', 'E', 'Y') },
  52
  53     /* quicktime */
  54     { PIX_FMT_UYVY422, MKTAG('2', 'v', 'u', 'y') },
  55
  56     { -1, 0 },
  57 };
  58
  59 static int findPixelFormat(unsigned int fourcc)
  60 {
  61     const PixelFormatTag * tags = pixelFormatTags;
  62     while (tags->pix_fmt >= 0) {
  63         if (tags->fourcc == fourcc)
  64             return tags->pix_fmt;
  65         tags++;
  66     }
  67     return PIX_FMT_YUV420P;
  68 }
  69
  70 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat fmt)
  71 {
  72     const PixelFormatTag * tags = pixelFormatTags;
  73     while (tags->pix_fmt >= 0) {
  74         if (tags->pix_fmt == fmt)
  75             return tags->fourcc;
  76         tags++;
  77     }
  78     return 0;
  79 }
  80
  81 /* RAW Decoder Implementation */
  82
  83 static int raw_init_decoder(AVCodecContext *avctx)
  84 {
  85     RawVideoContext *context = avctx->priv_data;
  86
  87     if (avctx->codec_tag)
  88         avctx->pix_fmt = findPixelFormat(avctx->codec_tag);
  89     else if (avctx->bits_per_sample){
  90         switch(avctx->bits_per_sample){
  91         case  8: avctx->pix_fmt= PIX_FMT_PAL8  ; break;
  92         case 15: avctx->pix_fmt= PIX_FMT_RGB555; break;
  93         case 16: avctx->pix_fmt= PIX_FMT_RGB565; break;
  94         case 24: avctx->pix_fmt= PIX_FMT_BGR24 ; break;
  95         case 32: avctx->pix_fmt= PIX_FMT_RGBA32; break;
  96         }
  97     }
  98
  99     context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
 100     context->buffer = av_malloc(context->length);
 101     context->pic.pict_type = FF_I_TYPE;
 102     context->pic.key_frame = 1;
 103
 104     avctx->coded_frame= &context->pic;
 105
 106     if (!context->buffer)
 107         return -1;
 108
 109     return 0;
 110 }
 111
 112 static void flip(AVCodecContext *avctx, AVPicture * picture){
 113     if(!avctx->codec_tag && avctx->bits_per_sample && picture->linesize[2]==0){
 114         picture->data[0] += picture->linesize[0] * (avctx->height-1);
 115         picture->linesize[0] *= -1;
 116     }
 117 }
 118
 119 static int raw_decode(AVCodecContext *avctx,
 120                             void *data, int *data_size,
 121                             uint8_t *buf, int buf_size)
 122 {
 123     RawVideoContext *context = avctx->priv_data;
 124
 125     AVFrame * frame = (AVFrame *) data;
 126     AVPicture * picture = (AVPicture *) data;
 127
 128     frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
 129     frame->top_field_first = avctx->coded_frame->top_field_first;
 130
 131     if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
 132         return -1;
 133
 134     avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
 135     if(avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length){
 136         frame->data[1]= context->buffer;
 137     }
 138     if (avctx->palctrl && avctx->palctrl->palette_changed) {
 139         memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
 140         avctx->palctrl->palette_changed = 0;
 141     }
 142
 143     flip(avctx, picture);
 144     *data_size = sizeof(AVPicture);
 145     return buf_size;
 146 }
 147
 148 static int raw_close_decoder(AVCodecContext *avctx)
 149 {
 150     RawVideoContext *context = avctx->priv_data;
 151
 152     av_freep(&context->buffer);
 153     return 0;
 154 }
 155
 156 /* RAW Encoder Implementation */
 157
 158 static int raw_init_encoder(AVCodecContext *avctx)
 159 {
 160     avctx->coded_frame = (AVFrame *)avctx->priv_data;
 161     avctx->coded_frame->pict_type = FF_I_TYPE;
 162     avctx->coded_frame->key_frame = 1;
 163     if(!avctx->codec_tag)
 164         avctx->codec_tag = avcodec_pix_fmt_to_codec_tag(avctx->pix_fmt);
 165     return 0;
 166 }
 167
 168 static int raw_encode(AVCodecContext *avctx,
 169                             unsigned char *frame, int buf_size, void *data)
 170 {
 171     return avpicture_layout((AVPicture *)data, avctx->pix_fmt, avctx->width,
 172                                                avctx->height, frame, buf_size);
 173 }
 174
 175 #ifdef CONFIG_RAWVIDEO_ENCODER
 176 AVCodec rawvideo_encoder = {
 177     "rawvideo",
 178     CODEC_TYPE_VIDEO,
 179     CODEC_ID_RAWVIDEO,
 180     sizeof(AVFrame),
 181     raw_init_encoder,
 182     raw_encode,
 183 };
 184 #endif // CONFIG_RAWVIDEO_ENCODER
 185
 186 AVCodec rawvideo_decoder = {
 187     "rawvideo",
 188     CODEC_TYPE_VIDEO,
 189     CODEC_ID_RAWVIDEO,
 190     sizeof(RawVideoContext),
 191     raw_init_decoder,
 192     NULL,
 193     raw_close_decoder,
 194     raw_decode,
 195 };