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426 lines
11 KiB
C
426 lines
11 KiB
C
/*
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* PNM 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 "bytestream.h"
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#include "pnm.h"
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static int common_init(AVCodecContext *avctx){
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PNMContext *s = avctx->priv_data;
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avcodec_get_frame_defaults((AVFrame*)&s->picture);
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avctx->coded_frame= (AVFrame*)&s->picture;
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return 0;
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}
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static int pnm_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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const uint8_t *buf, int buf_size)
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{
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PNMContext * const s = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame * const p= (AVFrame*)&s->picture;
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int i, n, linesize, h, upgrade = 0;
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unsigned char *ptr;
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s->bytestream_start=
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s->bytestream= buf;
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s->bytestream_end= buf + buf_size;
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if(ff_pnm_decode_header(avctx, s) < 0)
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return -1;
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if(p->data[0])
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avctx->release_buffer(avctx, p);
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p->reference= 0;
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if(avctx->get_buffer(avctx, p) < 0){
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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p->pict_type= FF_I_TYPE;
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p->key_frame= 1;
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switch(avctx->pix_fmt) {
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default:
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return -1;
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case PIX_FMT_RGB24:
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n = avctx->width * 3;
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goto do_read;
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case PIX_FMT_GRAY8:
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n = avctx->width;
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if (s->maxval < 255)
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upgrade = 1;
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goto do_read;
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case PIX_FMT_GRAY16BE:
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case PIX_FMT_GRAY16LE:
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n = avctx->width * 2;
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if (s->maxval < 65535)
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upgrade = 2;
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goto do_read;
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case PIX_FMT_MONOWHITE:
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case PIX_FMT_MONOBLACK:
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n = (avctx->width + 7) >> 3;
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do_read:
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ptr = p->data[0];
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linesize = p->linesize[0];
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if(s->bytestream + n*avctx->height > s->bytestream_end)
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return -1;
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for(i = 0; i < avctx->height; i++) {
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if (!upgrade)
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memcpy(ptr, s->bytestream, n);
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else if (upgrade == 1) {
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unsigned int j, f = (255*128 + s->maxval/2) / s->maxval;
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for (j=0; j<n; j++)
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ptr[j] = (s->bytestream[j] * f + 64) >> 7;
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} else if (upgrade == 2) {
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unsigned int j, v, f = (65535*32768 + s->maxval/2) / s->maxval;
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for (j=0; j<n/2; j++) {
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v = be2me_16(((uint16_t *)s->bytestream)[j]);
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((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
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}
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}
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s->bytestream += n;
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ptr += linesize;
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}
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break;
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case PIX_FMT_YUV420P:
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{
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unsigned char *ptr1, *ptr2;
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n = avctx->width;
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ptr = p->data[0];
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linesize = p->linesize[0];
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if(s->bytestream + n*avctx->height*3/2 > s->bytestream_end)
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return -1;
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for(i = 0; i < avctx->height; i++) {
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memcpy(ptr, s->bytestream, n);
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s->bytestream += n;
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ptr += linesize;
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}
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ptr1 = p->data[1];
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ptr2 = p->data[2];
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n >>= 1;
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h = avctx->height >> 1;
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for(i = 0; i < h; i++) {
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memcpy(ptr1, s->bytestream, n);
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s->bytestream += n;
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memcpy(ptr2, s->bytestream, n);
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s->bytestream += n;
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ptr1 += p->linesize[1];
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ptr2 += p->linesize[2];
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}
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}
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break;
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case PIX_FMT_RGB32:
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ptr = p->data[0];
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linesize = p->linesize[0];
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if(s->bytestream + avctx->width*avctx->height*4 > s->bytestream_end)
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return -1;
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for(i = 0; i < avctx->height; i++) {
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int j, r, g, b, a;
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for(j = 0;j < avctx->width; j++) {
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r = *s->bytestream++;
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g = *s->bytestream++;
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b = *s->bytestream++;
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a = *s->bytestream++;
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((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
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}
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ptr += linesize;
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}
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break;
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}
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*picture= *(AVFrame*)&s->picture;
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*data_size = sizeof(AVPicture);
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return s->bytestream - s->bytestream_start;
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}
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static int pnm_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){
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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, h1, c, n, linesize;
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uint8_t *ptr, *ptr1, *ptr2;
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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= FF_I_TYPE;
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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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h1 = h;
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switch(avctx->pix_fmt) {
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case PIX_FMT_MONOWHITE:
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c = '4';
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n = (avctx->width + 7) >> 3;
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break;
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case PIX_FMT_GRAY8:
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c = '5';
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n = avctx->width;
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break;
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case PIX_FMT_GRAY16BE:
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c = '5';
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n = avctx->width * 2;
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break;
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case PIX_FMT_RGB24:
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c = '6';
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n = avctx->width * 3;
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break;
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case PIX_FMT_YUV420P:
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c = '5';
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n = avctx->width;
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h1 = (h * 3) / 2;
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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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"P%c\n%d %d\n",
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c, avctx->width, h1);
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s->bytestream += strlen(s->bytestream);
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if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
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snprintf(s->bytestream, s->bytestream_end - s->bytestream,
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"%d\n", (avctx->pix_fmt != PIX_FMT_GRAY16BE) ? 255 : 65535);
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s->bytestream += strlen(s->bytestream);
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}
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ptr = p->data[0];
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linesize = p->linesize[0];
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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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if (avctx->pix_fmt == PIX_FMT_YUV420P) {
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h >>= 1;
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n >>= 1;
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ptr1 = p->data[1];
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ptr2 = p->data[2];
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for(i=0;i<h;i++) {
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memcpy(s->bytestream, ptr1, n);
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s->bytestream += n;
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memcpy(s->bytestream, ptr2, n);
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s->bytestream += n;
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ptr1 += p->linesize[1];
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ptr2 += p->linesize[2];
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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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static int pam_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){
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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= FF_I_TYPE;
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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_MONOWHITE:
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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_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_RGB32:
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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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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\nTUPLETYPE %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_RGB32) {
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int j;
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unsigned int v;
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for(i=0;i<h;i++) {
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for(j=0;j<w;j++) {
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v = ((uint32_t *)ptr)[j];
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bytestream_put_be24(&s->bytestream, v);
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*s->bytestream++ = v >> 24;
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}
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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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#if 0
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static int pnm_probe(AVProbeData *pd)
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{
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const char *p = pd->buf;
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if (pd->buf_size >= 8 &&
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p[0] == 'P' &&
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p[1] >= '4' && p[1] <= '6' &&
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pnm_space(p[2]) )
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return AVPROBE_SCORE_MAX - 1; /* to permit pgmyuv probe */
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else
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return 0;
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}
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static int pgmyuv_probe(AVProbeData *pd)
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{
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if (match_ext(pd->filename, "pgmyuv"))
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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static int pam_probe(AVProbeData *pd)
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{
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const char *p = pd->buf;
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if (pd->buf_size >= 8 &&
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p[0] == 'P' &&
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p[1] == '7' &&
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p[2] == '\n')
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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#endif
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#ifdef CONFIG_PGM_ENCODER
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AVCodec pgm_encoder = {
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"pgm",
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CODEC_TYPE_VIDEO,
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CODEC_ID_PGM,
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sizeof(PNMContext),
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common_init,
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pnm_encode_frame,
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NULL, //encode_end,
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pnm_decode_frame,
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.pix_fmts= (enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, -1},
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};
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#endif // CONFIG_PGM_ENCODER
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#ifdef CONFIG_PGMYUV_ENCODER
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AVCodec pgmyuv_encoder = {
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"pgmyuv",
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CODEC_TYPE_VIDEO,
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CODEC_ID_PGMYUV,
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sizeof(PNMContext),
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common_init,
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pnm_encode_frame,
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NULL, //encode_end,
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pnm_decode_frame,
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.pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
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};
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#endif // CONFIG_PGMYUV_ENCODER
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#ifdef CONFIG_PPM_ENCODER
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AVCodec ppm_encoder = {
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"ppm",
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CODEC_TYPE_VIDEO,
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CODEC_ID_PPM,
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sizeof(PNMContext),
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common_init,
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pnm_encode_frame,
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NULL, //encode_end,
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pnm_decode_frame,
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.pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, -1},
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};
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#endif // CONFIG_PPM_ENCODER
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#ifdef CONFIG_PBM_ENCODER
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AVCodec pbm_encoder = {
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"pbm",
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CODEC_TYPE_VIDEO,
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CODEC_ID_PBM,
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sizeof(PNMContext),
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common_init,
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pnm_encode_frame,
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NULL, //encode_end,
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pnm_decode_frame,
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.pix_fmts= (enum PixelFormat[]){PIX_FMT_MONOWHITE, -1},
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};
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#endif // CONFIG_PBM_ENCODER
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#ifdef CONFIG_PAM_ENCODER
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AVCodec pam_encoder = {
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"pam",
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CODEC_TYPE_VIDEO,
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CODEC_ID_PAM,
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sizeof(PNMContext),
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common_init,
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pam_encode_frame,
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NULL, //encode_end,
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pnm_decode_frame,
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.pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, -1},
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};
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#endif // CONFIG_PAM_ENCODER
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