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251 lines
6.3 KiB
251 lines
6.3 KiB
/* |
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* BMP image format |
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* Copyright (c) 2005 Mans Rullgard |
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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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#include "avcodec.h" |
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#include "bitstream.h" |
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#include "bswap.h" |
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typedef struct BMPContext { |
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AVFrame picture; |
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} BMPContext; |
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#define BMP_RGB 0 |
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#define BMP_RLE8 1 |
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#define BMP_RLE4 2 |
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#define BMP_BITFIELDS 3 |
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#define read16(bits) bswap_16(get_bits(bits, 16)) |
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#define read32(bits) bswap_32(get_bits_long(bits, 32)) |
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static int bmp_decode_init(AVCodecContext *avctx){ |
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BMPContext *s = avctx->priv_data; |
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avcodec_get_frame_defaults((AVFrame*)&s->picture); |
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avctx->coded_frame = (AVFrame*)&s->picture; |
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return 0; |
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} |
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static int bmp_decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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uint8_t *buf, int buf_size) |
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{ |
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BMPContext *s = avctx->priv_data; |
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AVFrame *picture = data; |
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AVFrame *p = &s->picture; |
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GetBitContext bits; |
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unsigned int fsize, hsize; |
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int width, height; |
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unsigned int depth; |
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unsigned int comp; |
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unsigned int ihsize; |
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int i, j, n, linesize; |
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uint32_t rgb[3]; |
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uint8_t *ptr; |
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int dsize; |
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if(buf_size < 14){ |
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av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size); |
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return -1; |
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} |
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init_get_bits(&bits, buf, buf_size); |
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if(get_bits(&bits, 16) != 0x424d){ /* 'BM' */ |
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av_log(avctx, AV_LOG_ERROR, "bad magic number\n"); |
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return -1; |
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} |
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fsize = read32(&bits); |
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if(buf_size < fsize){ |
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av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n", |
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buf_size, fsize); |
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return -1; |
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} |
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skip_bits(&bits, 16); /* reserved1 */ |
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skip_bits(&bits, 16); /* reserved2 */ |
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hsize = read32(&bits); /* header size */ |
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if(fsize <= hsize){ |
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av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n", |
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fsize, hsize); |
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return -1; |
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} |
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ihsize = read32(&bits); /* more header size */ |
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if(ihsize + 14 > hsize){ |
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av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize); |
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return -1; |
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} |
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width = read32(&bits); |
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height = read32(&bits); |
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if(read16(&bits) != 1){ /* planes */ |
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av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n"); |
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return -1; |
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} |
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depth = read16(&bits); |
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if(ihsize > 16) |
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comp = read32(&bits); |
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else |
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comp = BMP_RGB; |
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if(comp != BMP_RGB && comp != BMP_BITFIELDS){ |
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av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp); |
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return -1; |
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} |
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if(comp == BMP_BITFIELDS){ |
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skip_bits(&bits, 20 * 8); |
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rgb[0] = read32(&bits); |
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rgb[1] = read32(&bits); |
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rgb[2] = read32(&bits); |
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} |
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avctx->codec_id = CODEC_ID_BMP; |
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avctx->width = width; |
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avctx->height = height > 0? height: -height; |
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avctx->pix_fmt = PIX_FMT_NONE; |
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switch(depth){ |
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case 32: |
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if(comp == BMP_BITFIELDS){ |
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rgb[0] = (rgb[0] >> 15) & 3; |
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rgb[1] = (rgb[1] >> 15) & 3; |
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rgb[2] = (rgb[2] >> 15) & 3; |
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if(rgb[0] + rgb[1] + rgb[2] != 3 || |
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rgb[0] == rgb[1] || rgb[0] == rgb[2] || rgb[1] == rgb[2]){ |
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break; |
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} |
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} else { |
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rgb[0] = 2; |
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rgb[1] = 1; |
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rgb[2] = 0; |
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} |
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avctx->pix_fmt = PIX_FMT_BGR24; |
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break; |
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case 24: |
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avctx->pix_fmt = PIX_FMT_BGR24; |
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break; |
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case 16: |
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if(comp == BMP_RGB) |
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avctx->pix_fmt = PIX_FMT_RGB555; |
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break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, "depth %d not supported\n", depth); |
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return -1; |
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} |
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if(avctx->pix_fmt == PIX_FMT_NONE){ |
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av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n"); |
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return -1; |
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} |
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p->reference = 0; |
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if(avctx->get_buffer(avctx, p) < 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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p->pict_type = FF_I_TYPE; |
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p->key_frame = 1; |
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buf += hsize; |
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dsize = buf_size - hsize; |
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n = avctx->width * (depth / 8); |
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if(n * avctx->height > dsize){ |
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av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n", |
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dsize, n * avctx->height); |
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return -1; |
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} |
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if(height > 0){ |
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ptr = p->data[0] + (avctx->height - 1) * p->linesize[0]; |
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linesize = -p->linesize[0]; |
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} else { |
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ptr = p->data[0]; |
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linesize = p->linesize[0]; |
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} |
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switch(depth){ |
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case 24: |
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for(i = 0; i < avctx->height; i++){ |
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memcpy(ptr, buf, n); |
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buf += n; |
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ptr += linesize; |
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} |
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break; |
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case 16: |
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for(i = 0; i < avctx->height; i++){ |
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uint16_t *src = (uint16_t *) buf; |
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uint16_t *dst = (uint16_t *) ptr; |
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for(j = 0; j < avctx->width; j++) |
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*dst++ = le2me_16(*src++); |
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buf += n; |
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ptr += linesize; |
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} |
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break; |
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case 32: |
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for(i = 0; i < avctx->height; i++){ |
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uint8_t *src = buf; |
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uint8_t *dst = ptr; |
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for(j = 0; j < avctx->width; j++){ |
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dst[0] = src[rgb[2]]; |
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dst[1] = src[rgb[1]]; |
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dst[2] = src[rgb[0]]; |
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dst += 3; |
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src += 4; |
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} |
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buf += n; |
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ptr += linesize; |
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} |
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break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n"); |
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return -1; |
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} |
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*picture = s->picture; |
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*data_size = sizeof(AVPicture); |
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return buf_size; |
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} |
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AVCodec bmp_decoder = { |
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"bmp", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_BMP, |
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sizeof(BMPContext), |
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bmp_decode_init, |
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NULL, |
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NULL, |
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bmp_decode_frame |
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};
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