| /* |
| * PNM image format |
| * Copyright (c) 2002, 2003 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "avcodec.h" |
| #include "internal.h" |
| #include "put_bits.h" |
| #include "pnm.h" |
| |
| static void samplecpy(uint8_t *dst, const uint8_t *src, int n, int maxval) |
| { |
| if (maxval <= 255) { |
| memcpy(dst, src, n); |
| } else { |
| int i; |
| for (i=0; i<n/2; i++) { |
| ((uint16_t *)dst)[i] = AV_RB16(src+2*i); |
| } |
| } |
| } |
| |
| static int pnm_decode_frame(AVCodecContext *avctx, void *data, |
| int *got_frame, AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| PNMContext * const s = avctx->priv_data; |
| AVFrame * const p = data; |
| int i, j, n, linesize, h, upgrade = 0, is_mono = 0; |
| unsigned char *ptr; |
| int components, sample_len, ret; |
| |
| s->bytestream_start = |
| s->bytestream = (uint8_t *)buf; |
| s->bytestream_end = (uint8_t *)buf + buf_size; |
| |
| if ((ret = ff_pnm_decode_header(avctx, s)) < 0) |
| return ret; |
| |
| if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| return ret; |
| p->pict_type = AV_PICTURE_TYPE_I; |
| p->key_frame = 1; |
| avctx->bits_per_raw_sample = av_log2(s->maxval) + 1; |
| |
| switch (avctx->pix_fmt) { |
| default: |
| return AVERROR(EINVAL); |
| case AV_PIX_FMT_RGBA64: |
| n = avctx->width * 8; |
| components=4; |
| sample_len=16; |
| if (s->maxval < 65535) |
| upgrade = 2; |
| goto do_read; |
| case AV_PIX_FMT_RGB48: |
| n = avctx->width * 6; |
| components=3; |
| sample_len=16; |
| if (s->maxval < 65535) |
| upgrade = 2; |
| goto do_read; |
| case AV_PIX_FMT_RGBA: |
| n = avctx->width * 4; |
| components=4; |
| sample_len=8; |
| goto do_read; |
| case AV_PIX_FMT_RGB24: |
| n = avctx->width * 3; |
| components=3; |
| sample_len=8; |
| if (s->maxval < 255) |
| upgrade = 1; |
| goto do_read; |
| case AV_PIX_FMT_GRAY8: |
| n = avctx->width; |
| components=1; |
| sample_len=8; |
| if (s->maxval < 255) |
| upgrade = 1; |
| goto do_read; |
| case AV_PIX_FMT_GRAY8A: |
| n = avctx->width * 2; |
| components=2; |
| sample_len=8; |
| goto do_read; |
| case AV_PIX_FMT_GRAY16: |
| n = avctx->width * 2; |
| components=1; |
| sample_len=16; |
| if (s->maxval < 65535) |
| upgrade = 2; |
| goto do_read; |
| case AV_PIX_FMT_YA16: |
| n = avctx->width * 4; |
| components=2; |
| sample_len=16; |
| if (s->maxval < 65535) |
| upgrade = 2; |
| goto do_read; |
| case AV_PIX_FMT_MONOWHITE: |
| case AV_PIX_FMT_MONOBLACK: |
| n = (avctx->width + 7) >> 3; |
| components=1; |
| sample_len=1; |
| is_mono = 1; |
| do_read: |
| ptr = p->data[0]; |
| linesize = p->linesize[0]; |
| if (s->bytestream + n * avctx->height > s->bytestream_end) |
| return AVERROR_INVALIDDATA; |
| if(s->type < 4 || (is_mono && s->type==7)){ |
| for (i=0; i<avctx->height; i++) { |
| PutBitContext pb; |
| init_put_bits(&pb, ptr, linesize); |
| for(j=0; j<avctx->width * components; j++){ |
| unsigned int c=0; |
| int v=0; |
| if(s->type < 4) |
| while(s->bytestream < s->bytestream_end && (*s->bytestream < '0' || *s->bytestream > '9' )) |
| s->bytestream++; |
| if(s->bytestream >= s->bytestream_end) |
| return AVERROR_INVALIDDATA; |
| if (is_mono) { |
| /* read a single digit */ |
| v = (*s->bytestream++)&1; |
| } else { |
| /* read a sequence of digits */ |
| do { |
| v = 10*v + c; |
| c = (*s->bytestream++) - '0'; |
| } while (c <= 9); |
| } |
| if (sample_len == 16) { |
| ((uint16_t*)ptr)[j] = (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval; |
| } else |
| put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval); |
| } |
| if (sample_len != 16) |
| flush_put_bits(&pb); |
| ptr+= linesize; |
| } |
| }else{ |
| for (i = 0; i < avctx->height; i++) { |
| if (!upgrade) |
| samplecpy(ptr, s->bytestream, n, s->maxval); |
| else if (upgrade == 1) { |
| unsigned int j, f = (255 * 128 + s->maxval / 2) / s->maxval; |
| for (j = 0; j < n; j++) |
| ptr[j] = (s->bytestream[j] * f + 64) >> 7; |
| } else if (upgrade == 2) { |
| unsigned int j, v, f = (65535 * 32768 + s->maxval / 2) / s->maxval; |
| for (j = 0; j < n / 2; j++) { |
| v = av_be2ne16(((uint16_t *)s->bytestream)[j]); |
| ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15; |
| } |
| } |
| s->bytestream += n; |
| ptr += linesize; |
| } |
| } |
| break; |
| case AV_PIX_FMT_YUV420P: |
| case AV_PIX_FMT_YUV420P9: |
| case AV_PIX_FMT_YUV420P10: |
| { |
| unsigned char *ptr1, *ptr2; |
| |
| n = avctx->width; |
| ptr = p->data[0]; |
| linesize = p->linesize[0]; |
| if (s->maxval >= 256) |
| n *= 2; |
| if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end) |
| return AVERROR_INVALIDDATA; |
| for (i = 0; i < avctx->height; i++) { |
| samplecpy(ptr, s->bytestream, n, s->maxval); |
| s->bytestream += n; |
| ptr += linesize; |
| } |
| ptr1 = p->data[1]; |
| ptr2 = p->data[2]; |
| n >>= 1; |
| h = avctx->height >> 1; |
| for (i = 0; i < h; i++) { |
| samplecpy(ptr1, s->bytestream, n, s->maxval); |
| s->bytestream += n; |
| samplecpy(ptr2, s->bytestream, n, s->maxval); |
| s->bytestream += n; |
| ptr1 += p->linesize[1]; |
| ptr2 += p->linesize[2]; |
| } |
| } |
| break; |
| case AV_PIX_FMT_YUV420P16: |
| { |
| uint16_t *ptr1, *ptr2; |
| const int f = (65535 * 32768 + s->maxval / 2) / s->maxval; |
| unsigned int j, v; |
| |
| n = avctx->width * 2; |
| ptr = p->data[0]; |
| linesize = p->linesize[0]; |
| if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end) |
| return AVERROR_INVALIDDATA; |
| for (i = 0; i < avctx->height; i++) { |
| for (j = 0; j < n / 2; j++) { |
| v = av_be2ne16(((uint16_t *)s->bytestream)[j]); |
| ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15; |
| } |
| s->bytestream += n; |
| ptr += linesize; |
| } |
| ptr1 = (uint16_t*)p->data[1]; |
| ptr2 = (uint16_t*)p->data[2]; |
| n >>= 1; |
| h = avctx->height >> 1; |
| for (i = 0; i < h; i++) { |
| for (j = 0; j < n / 2; j++) { |
| v = av_be2ne16(((uint16_t *)s->bytestream)[j]); |
| ptr1[j] = (v * f + 16384) >> 15; |
| } |
| s->bytestream += n; |
| |
| for (j = 0; j < n / 2; j++) { |
| v = av_be2ne16(((uint16_t *)s->bytestream)[j]); |
| ptr2[j] = (v * f + 16384) >> 15; |
| } |
| s->bytestream += n; |
| |
| ptr1 += p->linesize[1] / 2; |
| ptr2 += p->linesize[2] / 2; |
| } |
| } |
| break; |
| } |
| *got_frame = 1; |
| |
| return s->bytestream - s->bytestream_start; |
| } |
| |
| |
| #if CONFIG_PGM_DECODER |
| AVCodec ff_pgm_decoder = { |
| .name = "pgm", |
| .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_PGM, |
| .priv_data_size = sizeof(PNMContext), |
| .decode = pnm_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
| |
| #if CONFIG_PGMYUV_DECODER |
| AVCodec ff_pgmyuv_decoder = { |
| .name = "pgmyuv", |
| .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_PGMYUV, |
| .priv_data_size = sizeof(PNMContext), |
| .decode = pnm_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
| |
| #if CONFIG_PPM_DECODER |
| AVCodec ff_ppm_decoder = { |
| .name = "ppm", |
| .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_PPM, |
| .priv_data_size = sizeof(PNMContext), |
| .decode = pnm_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
| |
| #if CONFIG_PBM_DECODER |
| AVCodec ff_pbm_decoder = { |
| .name = "pbm", |
| .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_PBM, |
| .priv_data_size = sizeof(PNMContext), |
| .decode = pnm_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
| |
| #if CONFIG_PAM_DECODER |
| AVCodec ff_pam_decoder = { |
| .name = "pam", |
| .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_PAM, |
| .priv_data_size = sizeof(PNMContext), |
| .decode = pnm_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
