mirror of
https://github.com/FFmpeg/FFmpeg.git
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139 lines
4.1 KiB
C
139 lines
4.1 KiB
C
/*
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* PAM image format
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* Copyright (c) 2002, 2003 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "pnm.h"
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static int pam_encode_frame(AVCodecContext *avctx, unsigned char *outbuf,
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int buf_size, void *data)
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{
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PNMContext *s = avctx->priv_data;
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AVFrame *pict = data;
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AVFrame * const p = (AVFrame*)&s->picture;
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int i, h, w, n, linesize, depth, maxval;
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const char *tuple_type;
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uint8_t *ptr;
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if (buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200) {
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av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
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return -1;
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}
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*p = *pict;
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p->pict_type = AV_PICTURE_TYPE_I;
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p->key_frame = 1;
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s->bytestream_start =
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s->bytestream = outbuf;
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s->bytestream_end = outbuf+buf_size;
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h = avctx->height;
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w = avctx->width;
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switch (avctx->pix_fmt) {
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case PIX_FMT_MONOBLACK:
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n = (w + 7) >> 3;
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depth = 1;
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maxval = 1;
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tuple_type = "BLACKANDWHITE";
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break;
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case PIX_FMT_GRAY8:
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n = w;
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depth = 1;
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maxval = 255;
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tuple_type = "GRAYSCALE";
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break;
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case PIX_FMT_GRAY16BE:
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n = w * 2;
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depth = 1;
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maxval = 0xFFFF;
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tuple_type = "GRAYSCALE";
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break;
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case PIX_FMT_GRAY8A:
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n = w * 2;
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depth = 2;
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maxval = 255;
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tuple_type = "GRAYSCALE_ALPHA";
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break;
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case PIX_FMT_RGB24:
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n = w * 3;
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depth = 3;
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maxval = 255;
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tuple_type = "RGB";
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break;
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case PIX_FMT_RGBA:
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n = w * 4;
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depth = 4;
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maxval = 255;
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tuple_type = "RGB_ALPHA";
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break;
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case PIX_FMT_RGB48BE:
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n = w * 6;
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depth = 3;
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maxval = 0xFFFF;
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tuple_type = "RGB";
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break;
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case PIX_FMT_RGBA64BE:
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n = w * 8;
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depth = 4;
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maxval = 0xFFFF;
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tuple_type = "RGB_ALPHA";
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break;
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default:
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return -1;
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}
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snprintf(s->bytestream, s->bytestream_end - s->bytestream,
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"P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLTYPE %s\nENDHDR\n",
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w, h, depth, maxval, tuple_type);
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s->bytestream += strlen(s->bytestream);
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ptr = p->data[0];
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linesize = p->linesize[0];
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if (avctx->pix_fmt == PIX_FMT_MONOBLACK){
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int j;
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++)
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*s->bytestream++ = ptr[j >> 3] >> (7 - j & 7) & 1;
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ptr += linesize;
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}
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} else {
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for (i = 0; i < h; i++) {
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memcpy(s->bytestream, ptr, n);
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s->bytestream += n;
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ptr += linesize;
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}
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}
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return s->bytestream - s->bytestream_start;
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}
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AVCodec ff_pam_encoder = {
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.name = "pam",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_PAM,
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.priv_data_size = sizeof(PNMContext),
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.init = ff_pnm_init,
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.encode = pam_encode_frame,
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.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},
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.long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
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};
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