mirror of
https://github.com/FFmpeg/FFmpeg.git
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260 lines
8.2 KiB
C
260 lines
8.2 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "internal.h"
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#include "put_bits.h"
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#include "pnm.h"
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static int pnm_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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PNMContext * const s = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame * const p = &s->picture;
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int i, j, n, linesize, h, upgrade = 0;
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unsigned char *ptr;
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int components, sample_len, ret;
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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 ((ret = ff_pnm_decode_header(avctx, s)) < 0)
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return ret;
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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 ((ret = ff_get_buffer(avctx, p)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return ret;
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}
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p->pict_type = AV_PICTURE_TYPE_I;
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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 AVERROR(EINVAL);
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case AV_PIX_FMT_RGB48BE:
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n = avctx->width * 6;
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components=3;
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sample_len=16;
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goto do_read;
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case AV_PIX_FMT_RGB24:
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n = avctx->width * 3;
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components=3;
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sample_len=8;
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goto do_read;
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case AV_PIX_FMT_GRAY8:
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n = avctx->width;
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components=1;
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sample_len=8;
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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 AV_PIX_FMT_GRAY16BE:
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case AV_PIX_FMT_GRAY16LE:
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n = avctx->width * 2;
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components=1;
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sample_len=16;
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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 AV_PIX_FMT_MONOWHITE:
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case AV_PIX_FMT_MONOBLACK:
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n = (avctx->width + 7) >> 3;
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components=1;
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sample_len=1;
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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 AVERROR_INVALIDDATA;
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if(s->type < 4){
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for (i=0; i<avctx->height; i++) {
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PutBitContext pb;
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init_put_bits(&pb, ptr, linesize);
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for(j=0; j<avctx->width * components; j++){
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unsigned int c=0;
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int v=0;
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while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' ))
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s->bytestream++;
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if(s->bytestream >= s->bytestream_end)
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return AVERROR_INVALIDDATA;
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do{
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v= 10*v + c;
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c= (*s->bytestream++) - '0';
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}while(c <= 9);
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put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval);
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}
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flush_put_bits(&pb);
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ptr+= linesize;
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}
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}else{
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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 = av_be2ne16(((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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}
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break;
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case AV_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 AVERROR_INVALIDDATA;
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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 AV_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 AVERROR_INVALIDDATA;
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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 = s->picture;
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*got_frame = 1;
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return s->bytestream - s->bytestream_start;
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}
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#if CONFIG_PGM_DECODER
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AVCodec ff_pgm_decoder = {
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.name = "pgm",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PGM,
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.priv_data_size = sizeof(PNMContext),
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.init = ff_pnm_init,
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.close = ff_pnm_end,
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.decode = pnm_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
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};
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#endif
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#if CONFIG_PGMYUV_DECODER
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AVCodec ff_pgmyuv_decoder = {
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.name = "pgmyuv",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PGMYUV,
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.priv_data_size = sizeof(PNMContext),
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.init = ff_pnm_init,
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.close = ff_pnm_end,
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.decode = pnm_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
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};
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#endif
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#if CONFIG_PPM_DECODER
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AVCodec ff_ppm_decoder = {
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.name = "ppm",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PPM,
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.priv_data_size = sizeof(PNMContext),
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.init = ff_pnm_init,
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.close = ff_pnm_end,
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.decode = pnm_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
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};
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#endif
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#if CONFIG_PBM_DECODER
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AVCodec ff_pbm_decoder = {
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.name = "pbm",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PBM,
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.priv_data_size = sizeof(PNMContext),
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.init = ff_pnm_init,
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.close = ff_pnm_end,
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.decode = pnm_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
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};
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#endif
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#if CONFIG_PAM_DECODER
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AVCodec ff_pam_decoder = {
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.name = "pam",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PAM,
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.priv_data_size = sizeof(PNMContext),
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.init = ff_pnm_init,
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.close = ff_pnm_end,
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.decode = pnm_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"),
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};
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#endif
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