From 318888f8082b9d388fa69632f0cb034cde4d34d1 Mon Sep 17 00:00:00 2001 From: Diego Biurrun Date: Wed, 28 Oct 2009 06:34:00 +0000 Subject: Split the decoders from pnmen.c off into their own file. Originally committed as revision 20394 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/pnmdec.c | 234 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 234 insertions(+) create mode 100644 libavcodec/pnmdec.c (limited to 'libavcodec/pnmdec.c') diff --git a/libavcodec/pnmdec.c b/libavcodec/pnmdec.c new file mode 100644 index 0000000000..f29c873200 --- /dev/null +++ b/libavcodec/pnmdec.c @@ -0,0 +1,234 @@ +/* + * 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 "bytestream.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 = (AVFrame*)&s->picture; + int i, n, linesize, h, upgrade = 0; + unsigned char *ptr; + + 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 = FF_I_TYPE; + p->key_frame = 1; + + switch (avctx->pix_fmt) { + default: + return -1; + case PIX_FMT_RGB48BE: + n = avctx->width * 6; + goto do_read; + case PIX_FMT_RGB24: + n = avctx->width * 3; + goto do_read; + case PIX_FMT_GRAY8: + n = avctx->width; + if (s->maxval < 255) + upgrade = 1; + goto do_read; + case PIX_FMT_GRAY16BE: + case PIX_FMT_GRAY16LE: + n = avctx->width * 2; + if (s->maxval < 65535) + upgrade = 2; + goto do_read; + case PIX_FMT_MONOWHITE: + case PIX_FMT_MONOBLACK: + n = (avctx->width + 7) >> 3; + do_read: + ptr = p->data[0]; + linesize = p->linesize[0]; + if (s->bytestream + n * avctx->height > s->bytestream_end) + return -1; + 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 = be2me_16(((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; + case PIX_FMT_RGB32: + ptr = p->data[0]; + linesize = p->linesize[0]; + if (s->bytestream + avctx->width * avctx->height * 4 > s->bytestream_end) + return -1; + for (i = 0; i < avctx->height; i++) { + int j, r, g, b, a; + + for (j = 0; j < avctx->width; j++) { + r = *s->bytestream++; + g = *s->bytestream++; + b = *s->bytestream++; + a = *s->bytestream++; + ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b; + } + ptr += linesize; + } + break; + } + *picture = *(AVFrame*)&s->picture; + *data_size = sizeof(AVPicture); + + return s->bytestream - s->bytestream_start; +} + + +#if CONFIG_PGM_DECODER +AVCodec pgm_decoder = { + "pgm", + CODEC_TYPE_VIDEO, + CODEC_ID_PGM, + sizeof(PNMContext), + ff_pnm_init, + NULL, + ff_pnm_end, + pnm_decode_frame, + CODEC_CAP_DR1, + .pix_fmts = (const enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"), +}; +#endif + +#if CONFIG_PGMYUV_DECODER +AVCodec pgmyuv_decoder = { + "pgmyuv", + CODEC_TYPE_VIDEO, + CODEC_ID_PGMYUV, + sizeof(PNMContext), + ff_pnm_init, + NULL, + ff_pnm_end, + pnm_decode_frame, + CODEC_CAP_DR1, + .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"), +}; +#endif + +#if CONFIG_PPM_DECODER +AVCodec ppm_decoder = { + "ppm", + CODEC_TYPE_VIDEO, + CODEC_ID_PPM, + sizeof(PNMContext), + ff_pnm_init, + NULL, + ff_pnm_end, + pnm_decode_frame, + CODEC_CAP_DR1, + .pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB48BE, PIX_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"), +}; +#endif + +#if CONFIG_PBM_DECODER +AVCodec pbm_decoder = { + "pbm", + CODEC_TYPE_VIDEO, + CODEC_ID_PBM, + sizeof(PNMContext), + ff_pnm_init, + NULL, + ff_pnm_end, + pnm_decode_frame, + CODEC_CAP_DR1, + .pix_fmts = (const enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"), +}; +#endif + +#if CONFIG_PAM_DECODER +AVCodec pam_decoder = { + "pam", + CODEC_TYPE_VIDEO, + CODEC_ID_PAM, + sizeof(PNMContext), + ff_pnm_init, + NULL, + ff_pnm_end, + pnm_decode_frame, + CODEC_CAP_DR1, + .pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("PAM (Portable AnyMap) image"), +}; +#endif -- cgit v1.2.3