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libavcodec/pnmenc.c

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00001 /*
00002  * PNM 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 pnm_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, h1, c, n, linesize;
00034     uint8_t *ptr, *ptr1, *ptr2;
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 = FF_I_TYPE;
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     h1 = h;
00051     switch (avctx->pix_fmt) {
00052     case PIX_FMT_MONOWHITE:
00053         c  = '4';
00054         n  = (avctx->width + 7) >> 3;
00055         break;
00056     case PIX_FMT_GRAY8:
00057         c  = '5';
00058         n  = avctx->width;
00059         break;
00060     case PIX_FMT_GRAY16BE:
00061         c  = '5';
00062         n  = avctx->width * 2;
00063         break;
00064     case PIX_FMT_RGB24:
00065         c  = '6';
00066         n  = avctx->width * 3;
00067         break;
00068     case PIX_FMT_RGB48BE:
00069         c  = '6';
00070         n  = avctx->width * 6;
00071         break;
00072     case PIX_FMT_YUV420P:
00073         c  = '5';
00074         n  = avctx->width;
00075         h1 = (h * 3) / 2;
00076         break;
00077     default:
00078         return -1;
00079     }
00080     snprintf(s->bytestream, s->bytestream_end - s->bytestream,
00081              "P%c\n%d %d\n", c, avctx->width, h1);
00082     s->bytestream += strlen(s->bytestream);
00083     if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
00084         snprintf(s->bytestream, s->bytestream_end - s->bytestream,
00085                  "%d\n", (avctx->pix_fmt != PIX_FMT_GRAY16BE && avctx->pix_fmt != PIX_FMT_RGB48BE) ? 255 : 65535);
00086         s->bytestream += strlen(s->bytestream);
00087     }
00088 
00089     ptr      = p->data[0];
00090     linesize = p->linesize[0];
00091     for (i = 0; i < h; i++) {
00092         memcpy(s->bytestream, ptr, n);
00093         s->bytestream += n;
00094         ptr           += linesize;
00095     }
00096 
00097     if (avctx->pix_fmt == PIX_FMT_YUV420P) {
00098         h >>= 1;
00099         n >>= 1;
00100         ptr1 = p->data[1];
00101         ptr2 = p->data[2];
00102         for (i = 0; i < h; i++) {
00103             memcpy(s->bytestream, ptr1, n);
00104             s->bytestream += n;
00105             memcpy(s->bytestream, ptr2, n);
00106             s->bytestream += n;
00107                 ptr1 += p->linesize[1];
00108                 ptr2 += p->linesize[2];
00109         }
00110     }
00111     return s->bytestream - s->bytestream_start;
00112 }
00113 
00114 
00115 #if CONFIG_PGM_ENCODER
00116 AVCodec pgm_encoder = {
00117     "pgm",
00118     AVMEDIA_TYPE_VIDEO,
00119     CODEC_ID_PGM,
00120     sizeof(PNMContext),
00121     ff_pnm_init,
00122     pnm_encode_frame,
00123     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE},
00124     .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
00125 };
00126 #endif
00127 
00128 #if CONFIG_PGMYUV_ENCODER
00129 AVCodec pgmyuv_encoder = {
00130     "pgmyuv",
00131     AVMEDIA_TYPE_VIDEO,
00132     CODEC_ID_PGMYUV,
00133     sizeof(PNMContext),
00134     ff_pnm_init,
00135     pnm_encode_frame,
00136     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
00137     .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
00138 };
00139 #endif
00140 
00141 #if CONFIG_PPM_ENCODER
00142 AVCodec ppm_encoder = {
00143     "ppm",
00144     AVMEDIA_TYPE_VIDEO,
00145     CODEC_ID_PPM,
00146     sizeof(PNMContext),
00147     ff_pnm_init,
00148     pnm_encode_frame,
00149     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE},
00150     .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
00151 };
00152 #endif
00153 
00154 #if CONFIG_PBM_ENCODER
00155 AVCodec pbm_encoder = {
00156     "pbm",
00157     AVMEDIA_TYPE_VIDEO,
00158     CODEC_ID_PBM,
00159     sizeof(PNMContext),
00160     ff_pnm_init,
00161     pnm_encode_frame,
00162     .pix_fmts  = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE},
00163     .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
00164 };
00165 #endif

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