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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 "internal.h" |
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#include "put_bits.h" |
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#include "pnm.h" |
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static void samplecpy(uint8_t *dst, const uint8_t *src, int n, int maxval) |
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{ |
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if (maxval <= 255) { |
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memcpy(dst, src, n); |
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} else { |
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int i; |
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for (i=0; i |
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((uint16_t *)dst)[i] = AV_RB16(src+2*i); |
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} |
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} |
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} |
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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 * const p = data; |
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int i, j, n, linesize, h, upgrade = 0, is_mono = 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 = (uint8_t *)buf; |
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s->bytestream_end = (uint8_t *)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 ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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return ret; |
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p->pict_type = AV_PICTURE_TYPE_I; |
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p->key_frame = 1; |
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avctx->bits_per_raw_sample = av_log2(s->maxval) + 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_RGBA64: |
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n = avctx->width * 8; |
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components=4; |
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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_RGB48: |
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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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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_RGBA: |
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n = avctx->width * 4; |
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components=4; |
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sample_len=8; |
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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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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_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_GRAY8A: |
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n = avctx->width * 2; |
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components=2; |
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sample_len=8; |
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goto do_read; |
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case AV_PIX_FMT_GRAY16: |
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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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is_mono = 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 || (is_mono && s->type==7)){ |
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for (i=0; iheight; i++) { |
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PutBitContext pb; |
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init_put_bits(&pb, ptr, linesize); |
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for(j=0; jwidth * components; j++){ |
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unsigned int c=0; |
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int v=0; |
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if(s->type < 4) |
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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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if (is_mono) { |
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/* read a single digit */ |
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v = (*s->bytestream++)&1; |
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} else { |
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/* read a sequence of digits */ |
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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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} |
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if (sample_len == 16) { |
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((uint16_t*)ptr)[j] = (((1<maxval>>1))/s->maxval; |
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} else |
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put_bits(&pb, sample_len, (((1<maxval>>1))/s->maxval); |
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} |
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if (sample_len != 16) |
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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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samplecpy(ptr, s->bytestream, n, s->maxval); |
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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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case AV_PIX_FMT_YUV420P9: |
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case AV_PIX_FMT_YUV420P10: |
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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->maxval >= 256) |
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n *= 2; |
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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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samplecpy(ptr, s->bytestream, n, s->maxval); |
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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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samplecpy(ptr1, s->bytestream, n, s->maxval); |
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s->bytestream += n; |
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samplecpy(ptr2, s->bytestream, n, s->maxval); |
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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_YUV420P16: |
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{ |
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uint16_t *ptr1, *ptr2; |
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const int f = (65535 * 32768 + s->maxval / 2) / s->maxval; |
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unsigned int j, v; |
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n = avctx->width * 2; |
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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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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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s->bytestream += n; |
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ptr += linesize; |
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} |
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ptr1 = (uint16_t*)p->data[1]; |
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ptr2 = (uint16_t*)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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for (j = 0; j < n / 2; j++) { |
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v = av_be2ne16(((uint16_t *)s->bytestream)[j]); |
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ptr1[j] = (v * f + 16384) >> 15; |
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} |
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s->bytestream += n; |
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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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ptr2[j] = (v * f + 16384) >> 15; |
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} |
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s->bytestream += n; |
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ptr1 += p->linesize[1] / 2; |
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ptr2 += p->linesize[2] / 2; |
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} |
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} |
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break; |
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} |
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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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.long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"), |
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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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.decode = pnm_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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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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.long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"), |
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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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.decode = pnm_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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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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.long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"), |
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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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.decode = pnm_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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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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.long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"), |
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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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.decode = pnm_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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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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.long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"), |
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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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.decode = pnm_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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}; |
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#endif |