ffmpeg / libavcodec / pnmdec.c @ d36beb3f
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/*
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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 "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 *data_size, 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 = (AVFrame*)&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;
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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_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 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 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 PIX_FMT_GRAY16BE:
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case 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 PIX_FMT_MONOWHITE:
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case 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 -1; |
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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 -1; |
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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 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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#if CONFIG_PGM_DECODER
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AVCodec ff_pgm_decoder = { |
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"pgm",
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AVMEDIA_TYPE_VIDEO, |
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CODEC_ID_PGM, |
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sizeof(PNMContext),
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ff_pnm_init, |
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NULL,
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ff_pnm_end, |
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pnm_decode_frame, |
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CODEC_CAP_DR1, |
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE}, |
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.max_lowres = 5,
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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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"pgmyuv",
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AVMEDIA_TYPE_VIDEO, |
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CODEC_ID_PGMYUV, |
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sizeof(PNMContext),
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ff_pnm_init, |
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NULL,
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ff_pnm_end, |
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pnm_decode_frame, |
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CODEC_CAP_DR1, |
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE}, |
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.max_lowres = 5,
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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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"ppm",
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AVMEDIA_TYPE_VIDEO, |
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CODEC_ID_PPM, |
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sizeof(PNMContext),
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ff_pnm_init, |
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NULL,
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ff_pnm_end, |
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pnm_decode_frame, |
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CODEC_CAP_DR1, |
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE}, |
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.max_lowres = 5,
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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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"pbm",
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AVMEDIA_TYPE_VIDEO, |
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CODEC_ID_PBM, |
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sizeof(PNMContext),
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ff_pnm_init, |
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NULL,
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ff_pnm_end, |
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pnm_decode_frame, |
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CODEC_CAP_DR1, |
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE}, |
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.max_lowres = 5,
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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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"pam",
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AVMEDIA_TYPE_VIDEO, |
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CODEC_ID_PAM, |
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sizeof(PNMContext),
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ff_pnm_init, |
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NULL,
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ff_pnm_end, |
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pnm_decode_frame, |
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CODEC_CAP_DR1, |
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE}, |
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.max_lowres = 5,
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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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