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Diffstat (limited to 'contrib/ffmpeg/libavcodec/8bps.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/8bps.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/8bps.c b/contrib/ffmpeg/libavcodec/8bps.c new file mode 100644 index 000000000..297465043 --- /dev/null +++ b/contrib/ffmpeg/libavcodec/8bps.c @@ -0,0 +1,236 @@ +/* + * Quicktime Planar RGB (8BPS) Video Decoder + * Copyright (C) 2003 Roberto Togni + * + * 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 + * + */ + +/** + * @file 8bps.c + * QT 8BPS Video Decoder by Roberto Togni <rtogni at bresciaonline dot it> + * For more information about the 8BPS format, visit: + * http://www.pcisys.net/~melanson/codecs/ + * + * Supports: PAL8 (RGB 8bpp, paletted) + * : BGR24 (RGB 24bpp) (can also output it as RGBA32) + * : RGBA32 (RGB 32bpp, 4th plane is probably alpha and it's ignored) + * + */ + +#include <stdio.h> +#include <stdlib.h> + +#include "common.h" +#include "avcodec.h" + + +static const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGBA32, -1}; + +/* + * Decoder context + */ +typedef struct EightBpsContext { + + AVCodecContext *avctx; + AVFrame pic; + + unsigned char planes; + unsigned char planemap[4]; +} EightBpsContext; + + +/* + * + * Decode a frame + * + */ +static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) +{ + EightBpsContext * const c = (EightBpsContext *)avctx->priv_data; + unsigned char *encoded = (unsigned char *)buf; + unsigned char *pixptr, *pixptr_end; + unsigned int height = avctx->height; // Real image height + unsigned int dlen, p, row; + unsigned char *lp, *dp; + unsigned char count; + unsigned int px_inc; + unsigned int planes = c->planes; + unsigned char *planemap = c->planemap; + + if(c->pic.data[0]) + avctx->release_buffer(avctx, &c->pic); + + c->pic.reference = 0; + c->pic.buffer_hints = FF_BUFFER_HINTS_VALID; + if(avctx->get_buffer(avctx, &c->pic) < 0){ + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return -1; + } + + /* Set data pointer after line lengths */ + dp = encoded + planes * (height << 1); + + /* Ignore alpha plane, don't know what to do with it */ + if (planes == 4) + planes--; + + px_inc = planes + (avctx->pix_fmt == PIX_FMT_RGBA32); + + for (p = 0; p < planes; p++) { + /* Lines length pointer for this plane */ + lp = encoded + p * (height << 1); + + /* Decode a plane */ + for(row = 0; row < height; row++) { + pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p]; + pixptr_end = pixptr + c->pic.linesize[0]; + dlen = be2me_16(*(unsigned short *)(lp+row*2)); + /* Decode a row of this plane */ + while(dlen > 0) { + if(dp + 1 >= buf+buf_size) return -1; + if ((count = *dp++) <= 127) { + count++; + dlen -= count + 1; + if (pixptr + count * px_inc > pixptr_end) + break; + if(dp + count > buf+buf_size) return -1; + while(count--) { + *pixptr = *dp++; + pixptr += px_inc; + } + } else { + count = 257 - count; + if (pixptr + count * px_inc > pixptr_end) + break; + while(count--) { + *pixptr = *dp; + pixptr += px_inc; + } + dp++; + dlen -= 2; + } + } + } + } + + if (avctx->palctrl) { + memcpy (c->pic.data[1], avctx->palctrl->palette, AVPALETTE_SIZE); + if (avctx->palctrl->palette_changed) { + c->pic.palette_has_changed = 1; + avctx->palctrl->palette_changed = 0; + } else + c->pic.palette_has_changed = 0; + } + + *data_size = sizeof(AVFrame); + *(AVFrame*)data = c->pic; + + /* always report that the buffer was completely consumed */ + return buf_size; +} + + +/* + * + * Init 8BPS decoder + * + */ +static int decode_init(AVCodecContext *avctx) +{ + EightBpsContext * const c = (EightBpsContext *)avctx->priv_data; + + c->avctx = avctx; + avctx->has_b_frames = 0; + + c->pic.data[0] = NULL; + + if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) { + return 1; + } + + switch (avctx->bits_per_sample) { + case 8: + avctx->pix_fmt = PIX_FMT_PAL8; + c->planes = 1; + c->planemap[0] = 0; // 1st plane is palette indexes + if (avctx->palctrl == NULL) { + av_log(avctx, AV_LOG_ERROR, "Error: PAL8 format but no palette from demuxer.\n"); + return -1; + } + break; + case 24: + avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24); + c->planes = 3; + c->planemap[0] = 2; // 1st plane is red + c->planemap[1] = 1; // 2nd plane is green + c->planemap[2] = 0; // 3rd plane is blue + break; + case 32: + avctx->pix_fmt = PIX_FMT_RGBA32; + c->planes = 4; +#ifdef WORDS_BIGENDIAN + c->planemap[0] = 1; // 1st plane is red + c->planemap[1] = 2; // 2nd plane is green + c->planemap[2] = 3; // 3rd plane is blue + c->planemap[3] = 0; // 4th plane is alpha??? +#else + c->planemap[0] = 2; // 1st plane is red + c->planemap[1] = 1; // 2nd plane is green + c->planemap[2] = 0; // 3rd plane is blue + c->planemap[3] = 3; // 4th plane is alpha??? +#endif + break; + default: + av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n", avctx->bits_per_sample); + return -1; + } + + return 0; +} + + + + +/* + * + * Uninit 8BPS decoder + * + */ +static int decode_end(AVCodecContext *avctx) +{ + EightBpsContext * const c = (EightBpsContext *)avctx->priv_data; + + if (c->pic.data[0]) + avctx->release_buffer(avctx, &c->pic); + + return 0; +} + + + +AVCodec eightbps_decoder = { + "8bps", + CODEC_TYPE_VIDEO, + CODEC_ID_8BPS, + sizeof(EightBpsContext), + decode_init, + NULL, + decode_end, + decode_frame, + CODEC_CAP_DR1, +}; |