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Diffstat (limited to 'ffmpeg/libavcodec/8bps.c')
| -rw-r--r-- | ffmpeg/libavcodec/8bps.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/8bps.c b/ffmpeg/libavcodec/8bps.c new file mode 100644 index 0000000..a910551 --- /dev/null +++ b/ffmpeg/libavcodec/8bps.c @@ -0,0 +1,190 @@ +/* + * 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 + * QT 8BPS Video Decoder by Roberto Togni + * 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 RGB32) + * : RGB32 (RGB 32bpp, 4th plane is alpha) + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "libavutil/internal.h" +#include "libavutil/intreadwrite.h" +#include "avcodec.h" +#include "internal.h" + + +static const enum AVPixelFormat pixfmt_rgb24[] = { + AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE }; + +typedef struct EightBpsContext { + AVCodecContext *avctx; + + unsigned char planes; + unsigned char planemap[4]; + + uint32_t pal[256]; +} EightBpsContext; + +static int decode_frame(AVCodecContext *avctx, void *data, + int *got_frame, AVPacket *avpkt) +{ + AVFrame *frame = data; + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + EightBpsContext * const c = avctx->priv_data; + const unsigned char *encoded = buf; + unsigned char *pixptr, *pixptr_end; + unsigned int height = avctx->height; // Real image height + unsigned int dlen, p, row; + const unsigned char *lp, *dp; + unsigned char count; + unsigned int planes = c->planes; + unsigned char *planemap = c->planemap; + int ret; + + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + + /* Set data pointer after line lengths */ + dp = encoded + planes * (height << 1); + + 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 = frame->data[0] + row * frame->linesize[0] + planemap[p]; + pixptr_end = pixptr + frame->linesize[0]; + if(lp - encoded + row*2 + 1 >= buf_size) + return -1; + dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2)); + /* Decode a row of this plane */ + while (dlen > 0) { + if (dp + 1 >= buf + buf_size) + return AVERROR_INVALIDDATA; + if ((count = *dp++) <= 127) { + count++; + dlen -= count + 1; + if (pixptr + count * planes > pixptr_end) + break; + if (dp + count > buf + buf_size) + return AVERROR_INVALIDDATA; + while (count--) { + *pixptr = *dp++; + pixptr += planes; + } + } else { + count = 257 - count; + if (pixptr + count * planes > pixptr_end) + break; + while (count--) { + *pixptr = *dp; + pixptr += planes; + } + dp++; + dlen -= 2; + } + } + } + } + + if (avctx->bits_per_coded_sample <= 8) { + const uint8_t *pal = av_packet_get_side_data(avpkt, + AV_PKT_DATA_PALETTE, + NULL); + if (pal) { + frame->palette_has_changed = 1; + memcpy(c->pal, pal, AVPALETTE_SIZE); + } + + memcpy (frame->data[1], c->pal, AVPALETTE_SIZE); + } + + *got_frame = 1; + + /* always report that the buffer was completely consumed */ + return buf_size; +} + +static av_cold int decode_init(AVCodecContext *avctx) +{ + EightBpsContext * const c = avctx->priv_data; + + c->avctx = avctx; + + switch (avctx->bits_per_coded_sample) { + case 8: + avctx->pix_fmt = AV_PIX_FMT_PAL8; + c->planes = 1; + c->planemap[0] = 0; // 1st plane is palette indexes + 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 = AV_PIX_FMT_RGB32; + c->planes = 4; +#if HAVE_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_coded_sample); + return AVERROR_INVALIDDATA; + } + + return 0; +} + +AVCodec ff_eightbps_decoder = { + .name = "8bps", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_8BPS, + .priv_data_size = sizeof(EightBpsContext), + .init = decode_init, + .decode = decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"), +}; |