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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 "pnm.h"
00024 
00025 
00026 static int pam_encode_frame(AVCodecContext *avctx, unsigned char *outbuf,
00027                             int buf_size, void *data)
00028 {
00029     PNMContext *s     = avctx->priv_data;
00030     AVFrame *pict     = data;
00031     AVFrame * const p = (AVFrame*)&s->picture;
00032     int i, h, w, n, linesize, depth, maxval;
00033     const char *tuple_type;
00034     uint8_t *ptr;
00035 
00036     if (buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200) {
00037         av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
00038         return -1;
00039     }
00040 
00041     *p           = *pict;
00042     p->pict_type = AV_PICTURE_TYPE_I;
00043     p->key_frame = 1;
00044 
00045     s->bytestream_start =
00046     s->bytestream       = outbuf;
00047     s->bytestream_end   = outbuf+buf_size;
00048 
00049     h = avctx->height;
00050     w = avctx->width;
00051     switch (avctx->pix_fmt) {
00052     case PIX_FMT_MONOBLACK:
00053         n          = (w + 7) >> 3;
00054         depth      = 1;
00055         maxval     = 1;
00056         tuple_type = "BLACKANDWHITE";
00057         break;
00058     case PIX_FMT_GRAY8:
00059         n          = w;
00060         depth      = 1;
00061         maxval     = 255;
00062         tuple_type = "GRAYSCALE";
00063         break;
00064     case PIX_FMT_GRAY16BE:
00065         n          = w * 2;
00066         depth      = 1;
00067         maxval     = 0xFFFF;
00068         tuple_type = "GRAYSCALE";
00069         break;
00070     case PIX_FMT_GRAY8A:
00071         n          = w * 2;
00072         depth      = 2;
00073         maxval     = 255;
00074         tuple_type = "GRAYSCALE_ALPHA";
00075         break;
00076     case PIX_FMT_RGB24:
00077         n          = w * 3;
00078         depth      = 3;
00079         maxval     = 255;
00080         tuple_type = "RGB";
00081         break;
00082     case PIX_FMT_RGBA:
00083         n          = w * 4;
00084         depth      = 4;
00085         maxval     = 255;
00086         tuple_type = "RGB_ALPHA";
00087         break;
00088     case PIX_FMT_RGB48BE:
00089         n          = w * 6;
00090         depth      = 3;
00091         maxval     = 0xFFFF;
00092         tuple_type = "RGB";
00093         break;
00094     case PIX_FMT_RGBA64BE:
00095         n          = w * 8;
00096         depth      = 4;
00097         maxval     = 0xFFFF;
00098         tuple_type = "RGB_ALPHA";
00099         break;
00100     default:
00101         return -1;
00102     }
00103     snprintf(s->bytestream, s->bytestream_end - s->bytestream,
00104              "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLTYPE %s\nENDHDR\n",
00105              w, h, depth, maxval, tuple_type);
00106     s->bytestream += strlen(s->bytestream);
00107 
00108     ptr      = p->data[0];
00109     linesize = p->linesize[0];
00110 
00111     if (avctx->pix_fmt == PIX_FMT_MONOBLACK){
00112         int j;
00113         for (i = 0; i < h; i++) {
00114             for (j = 0; j < w; j++)
00115                 *s->bytestream++ = ptr[j >> 3] >> (7 - j & 7) & 1;
00116             ptr += linesize;
00117         }
00118     } else {
00119         for (i = 0; i < h; i++) {
00120             memcpy(s->bytestream, ptr, n);
00121             s->bytestream += n;
00122             ptr           += linesize;
00123         }
00124     }
00125     return s->bytestream - s->bytestream_start;
00126 }
00127 
00128 
00129 AVCodec ff_pam_encoder = {
00130     .name           = "pam",
00131     .type           = AVMEDIA_TYPE_VIDEO,
00132     .id             = CODEC_ID_PAM,
00133     .priv_data_size = sizeof(PNMContext),
00134     .init           = ff_pnm_init,
00135     .encode         = pam_encode_frame,
00136     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGBA, PIX_FMT_RGB48BE, PIX_FMT_RGBA64BE, PIX_FMT_GRAY8, PIX_FMT_GRAY8A, PIX_FMT_GRAY16BE, PIX_FMT_MONOBLACK, PIX_FMT_NONE},
00137     .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
00138 };
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