ffmpeg / libavcodec / 8bps.c @ 5509bffa
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/*
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* Quicktime Planar RGB (8BPS) Video Decoder
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* Copyright (C) 2003 Roberto Togni
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/**
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* @file 8bps.c
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* QT 8BPS Video Decoder by Roberto Togni <rtogni at bresciaonline dot it>
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* For more information about the 8BPS format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*
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* Supports: PAL8 (RGB 8bpp, paletted)
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* : BGR24 (RGB 24bpp) (can also output it as RGBA32)
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* : RGBA32 (RGB 32bpp, 4th plane is probably alpha and it's ignored)
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*
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*/
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#include <stdio.h> |
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#include <stdlib.h> |
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#include "common.h" |
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#include "avcodec.h" |
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const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGBA32, -1}; |
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/*
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* Decoder context
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*/
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typedef struct EightBpsContext { |
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AVCodecContext *avctx; |
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AVFrame pic; |
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unsigned char planes; |
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unsigned char planemap[4]; |
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} EightBpsContext; |
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/*
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*
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* Decode a frame
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*
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*/
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) |
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{ |
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EightBpsContext * const c = (EightBpsContext *)avctx->priv_data;
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unsigned char *encoded = (unsigned char *)buf; |
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unsigned char *pixptr, *pixptr_end; |
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unsigned int height = avctx->height; // Real image height |
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unsigned int dlen, p, row; |
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unsigned char *lp, *dp; |
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unsigned char count; |
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unsigned int px_inc; |
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unsigned int planes = c->planes; |
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unsigned char *planemap = c->planemap; |
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if(c->pic.data[0]) |
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avctx->release_buffer(avctx, &c->pic); |
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c->pic.reference = 0;
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c->pic.buffer_hints = FF_BUFFER_HINTS_VALID; |
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if(avctx->get_buffer(avctx, &c->pic) < 0){ |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1; |
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} |
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/* Set data pointer after line lengths */
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dp = encoded + planes * (height << 1);
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/* Ignore alpha plane, don't know what to do with it */
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if (planes == 4) |
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planes--; |
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px_inc = planes + (avctx->pix_fmt == PIX_FMT_RGBA32); |
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for (p = 0; p < planes; p++) { |
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/* Lines length pointer for this plane */
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lp = encoded + p * (height << 1);
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/* Decode a plane */
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for(row = 0; row < height; row++) { |
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pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p]; |
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pixptr_end = pixptr + c->pic.linesize[0];
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dlen = be2me_16(*(unsigned short *)(lp+row*2)); |
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/* Decode a row of this plane */
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while(dlen > 0) { |
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if(dp + 1 >= buf+buf_size) return -1; |
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if ((count = *dp++) <= 127) { |
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count++; |
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dlen -= count + 1;
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if (pixptr + count * px_inc > pixptr_end)
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break;
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if(dp + count > buf+buf_size) return -1; |
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while(count--) {
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*pixptr = *dp++; |
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pixptr += px_inc; |
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} |
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} else {
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count = 257 - count;
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if (pixptr + count * px_inc > pixptr_end)
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break;
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while(count--) {
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*pixptr = *dp; |
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pixptr += px_inc; |
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} |
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dp++; |
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dlen -= 2;
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} |
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} |
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} |
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} |
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if (avctx->palctrl) {
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memcpy (c->pic.data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
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if (avctx->palctrl->palette_changed) {
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c->pic.palette_has_changed = 1;
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avctx->palctrl->palette_changed = 0;
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} else
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c->pic.palette_has_changed = 0;
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} |
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = c->pic; |
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/* always report that the buffer was completely consumed */
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return buf_size;
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} |
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/*
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*
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* Init 8BPS decoder
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*
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*/
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static int decode_init(AVCodecContext *avctx) |
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{ |
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EightBpsContext * const c = (EightBpsContext *)avctx->priv_data;
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c->avctx = avctx; |
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avctx->has_b_frames = 0;
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c->pic.data[0] = NULL; |
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if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) { |
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return 1; |
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} |
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switch (avctx->bits_per_sample) {
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case 8: |
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avctx->pix_fmt = PIX_FMT_PAL8; |
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c->planes = 1;
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c->planemap[0] = 0; // 1st plane is palette indexes |
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if (avctx->palctrl == NULL) { |
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av_log(avctx, AV_LOG_ERROR, "Error: PAL8 format but no palette from demuxer.\n");
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return -1; |
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} |
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break;
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case 24: |
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avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24); |
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c->planes = 3;
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c->planemap[0] = 2; // 1st plane is red |
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c->planemap[1] = 1; // 2nd plane is green |
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c->planemap[2] = 0; // 3rd plane is blue |
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break;
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case 32: |
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avctx->pix_fmt = PIX_FMT_RGBA32; |
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c->planes = 4;
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#ifdef WORDS_BIGENDIAN
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c->planemap[0] = 1; // 1st plane is red |
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c->planemap[1] = 2; // 2nd plane is green |
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c->planemap[2] = 3; // 3rd plane is blue |
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c->planemap[3] = 0; // 4th plane is alpha??? |
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#else
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c->planemap[0] = 2; // 1st plane is red |
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c->planemap[1] = 1; // 2nd plane is green |
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c->planemap[2] = 0; // 3rd plane is blue |
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c->planemap[3] = 3; // 4th plane is alpha??? |
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#endif
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n", avctx->bits_per_sample);
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return -1; |
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} |
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return 0; |
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} |
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/*
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*
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* Uninit 8BPS decoder
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*
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*/
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static int decode_end(AVCodecContext *avctx) |
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{ |
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EightBpsContext * const c = (EightBpsContext *)avctx->priv_data;
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if (c->pic.data[0]) |
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avctx->release_buffer(avctx, &c->pic); |
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return 0; |
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} |
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AVCodec eightbps_decoder = { |
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"8bps",
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CODEC_TYPE_VIDEO, |
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CODEC_ID_8BPS, |
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sizeof(EightBpsContext),
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decode_init, |
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NULL,
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decode_end, |
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decode_frame, |
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CODEC_CAP_DR1, |
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}; |