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libavcodec/pamenc.c

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00001 /*
00002  * PAM image format
00003  * Copyright (c) 2002, 2003 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "avcodec.h"
00023 #include "bytestream.h"
00024 #include "pnm.h"
00025 
00026 
00027 static int pam_encode_frame(AVCodecContext *avctx, unsigned char *outbuf,
00028                             int buf_size, void *data)
00029 {
00030     PNMContext *s     = avctx->priv_data;
00031     AVFrame *pict     = data;
00032     AVFrame * const p = (AVFrame*)&s->picture;
00033     int i, h, w, n, linesize, depth, maxval;
00034     const char *tuple_type;
00035     uint8_t *ptr;
00036 
00037     if (buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200) {
00038         av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
00039         return -1;
00040     }
00041 
00042     *p           = *pict;
00043     p->pict_type = FF_I_TYPE;
00044     p->key_frame = 1;
00045 
00046     s->bytestream_start =
00047     s->bytestream       = outbuf;
00048     s->bytestream_end   = outbuf+buf_size;
00049 
00050     h = avctx->height;
00051     w = avctx->width;
00052     switch (avctx->pix_fmt) {
00053     case PIX_FMT_MONOWHITE:
00054         n          = (w + 7) >> 3;
00055         depth      = 1;
00056         maxval     = 1;
00057         tuple_type = "BLACKANDWHITE";
00058         break;
00059     case PIX_FMT_GRAY8:
00060         n          = w;
00061         depth      = 1;
00062         maxval     = 255;
00063         tuple_type = "GRAYSCALE";
00064         break;
00065     case PIX_FMT_RGB24:
00066         n          = w * 3;
00067         depth      = 3;
00068         maxval     = 255;
00069         tuple_type = "RGB";
00070         break;
00071     case PIX_FMT_RGB32:
00072         n          = w * 4;
00073         depth      = 4;
00074         maxval     = 255;
00075         tuple_type = "RGB_ALPHA";
00076         break;
00077     default:
00078         return -1;
00079     }
00080     snprintf(s->bytestream, s->bytestream_end - s->bytestream,
00081              "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLETYPE %s\nENDHDR\n",
00082              w, h, depth, maxval, tuple_type);
00083     s->bytestream += strlen(s->bytestream);
00084 
00085     ptr      = p->data[0];
00086     linesize = p->linesize[0];
00087 
00088     if (avctx->pix_fmt == PIX_FMT_RGB32) {
00089         int j;
00090         unsigned int v;
00091 
00092         for (i = 0; i < h; i++) {
00093             for (j = 0; j < w; j++) {
00094                 v = ((uint32_t *)ptr)[j];
00095                 bytestream_put_be24(&s->bytestream, v);
00096                 *s->bytestream++ = v >> 24;
00097             }
00098             ptr += linesize;
00099         }
00100     } else {
00101         for (i = 0; i < h; i++) {
00102             memcpy(s->bytestream, ptr, n);
00103             s->bytestream += n;
00104             ptr           += linesize;
00105         }
00106     }
00107     return s->bytestream - s->bytestream_start;
00108 }
00109 
00110 
00111 AVCodec pam_encoder = {
00112     "pam",
00113     AVMEDIA_TYPE_VIDEO,
00114     CODEC_ID_PAM,
00115     sizeof(PNMContext),
00116     ff_pnm_init,
00117     pam_encode_frame,
00118     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE},
00119     .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
00120 };

Generated on Fri Sep 16 2011 17:17:41 for FFmpeg by  doxygen 1.7.1