/* * 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 "put_bits.h" #include "pnm.h" static int pnm_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; PNMContext * const s = avctx->priv_data; AVFrame *picture = data; AVFrame * const p = &s->picture; int i, j, n, linesize, h, upgrade = 0, is_mono = 0; unsigned char *ptr; int components, sample_len; s->bytestream_start = s->bytestream = buf; s->bytestream_end = buf + buf_size; if (ff_pnm_decode_header(avctx, s) < 0) return -1; if (p->data[0]) avctx->release_buffer(avctx, p); p->reference = 0; if (avctx->get_buffer(avctx, p) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } p->pict_type = AV_PICTURE_TYPE_I; p->key_frame = 1; switch (avctx->pix_fmt) { default: return -1; case PIX_FMT_RGBA64BE: n = avctx->width * 8; components=4; sample_len=16; goto do_read; case PIX_FMT_RGB48BE: n = avctx->width * 6; components=3; sample_len=16; goto do_read; case PIX_FMT_RGBA: n = avctx->width * 4; components=4; sample_len=8; goto do_read; case PIX_FMT_RGB24: n = avctx->width * 3; components=3; sample_len=8; goto do_read; case PIX_FMT_GRAY8: n = avctx->width; components=1; sample_len=8; if (s->maxval < 255) upgrade = 1; goto do_read; case PIX_FMT_GRAY8A: n = avctx->width * 2; components=2; sample_len=8; goto do_read; case PIX_FMT_GRAY16BE: case PIX_FMT_GRAY16LE: n = avctx->width * 2; components=1; sample_len=16; if (s->maxval < 65535) upgrade = 2; goto do_read; case PIX_FMT_MONOWHITE: case 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 -1; 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 -1; 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); } put_bits(&pb, sample_len, (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval); } flush_put_bits(&pb); ptr+= linesize; } }else{ for (i = 0; i < avctx->height; i++) { if (!upgrade) memcpy(ptr, s->bytestream, n); 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 PIX_FMT_YUV420P: { unsigned char *ptr1, *ptr2; n = avctx->width; ptr = p->data[0]; linesize = p->linesize[0]; if (s->bytestream + n * avctx->height * 3 / 2 > s->bytestream_end) return -1; for (i = 0; i < avctx->height; i++) { memcpy(ptr, s->bytestream, n); 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++) { memcpy(ptr1, s->bytestream, n); s->bytestream += n; memcpy(ptr2, s->bytestream, n); s->bytestream += n; ptr1 += p->linesize[1]; ptr2 += p->linesize[2]; } } break; } *picture = s->picture; *data_size = sizeof(AVPicture); return s->bytestream - s->bytestream_start; } #if CONFIG_PGM_DECODER AVCodec ff_pgm_decoder = { .name = "pgm", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_PGM, .priv_data_size = sizeof(PNMContext), .init = ff_pnm_init, .close = ff_pnm_end, .decode = pnm_decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"), }; #endif #if CONFIG_PGMYUV_DECODER AVCodec ff_pgmyuv_decoder = { .name = "pgmyuv", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_PGMYUV, .priv_data_size = sizeof(PNMContext), .init = ff_pnm_init, .close = ff_pnm_end, .decode = pnm_decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"), }; #endif #if CONFIG_PPM_DECODER AVCodec ff_ppm_decoder = { .name = "ppm", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_PPM, .priv_data_size = sizeof(PNMContext), .init = ff_pnm_init, .close = ff_pnm_end, .decode = pnm_decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"), }; #endif #if CONFIG_PBM_DECODER AVCodec ff_pbm_decoder = { .name = "pbm", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_PBM, .priv_data_size = sizeof(PNMContext), .init = ff_pnm_init, .close = ff_pnm_end, .decode = pnm_decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"), }; #endif #if CONFIG_PAM_DECODER AVCodec ff_pam_decoder = { .name = "pam", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_PAM, .priv_data_size = sizeof(PNMContext), .init = ff_pnm_init, .close = ff_pnm_end, .decode = pnm_decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"), }; #endif