| /* |
| * BMP image format decoder |
| * Copyright (c) 2005 Mans Rullgard |
| * |
| * 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 <inttypes.h> |
| |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "bmp.h" |
| #include "internal.h" |
| #include "msrledec.h" |
| |
| static int bmp_decode_frame(AVCodecContext *avctx, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| AVFrame *p = data; |
| unsigned int fsize, hsize; |
| int width, height; |
| unsigned int depth; |
| BiCompression comp; |
| unsigned int ihsize; |
| int i, j, n, linesize, ret; |
| uint32_t rgb[3] = {0}; |
| uint32_t alpha = 0; |
| uint8_t *ptr; |
| int dsize; |
| const uint8_t *buf0 = buf; |
| GetByteContext gb; |
| |
| if (buf_size < 14) { |
| av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (bytestream_get_byte(&buf) != 'B' || |
| bytestream_get_byte(&buf) != 'M') { |
| av_log(avctx, AV_LOG_ERROR, "bad magic number\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| fsize = bytestream_get_le32(&buf); |
| if (buf_size < fsize) { |
| av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %u), trying to decode anyway\n", |
| buf_size, fsize); |
| fsize = buf_size; |
| } |
| |
| buf += 2; /* reserved1 */ |
| buf += 2; /* reserved2 */ |
| |
| hsize = bytestream_get_le32(&buf); /* header size */ |
| ihsize = bytestream_get_le32(&buf); /* more header size */ |
| if (ihsize + 14LL > hsize) { |
| av_log(avctx, AV_LOG_ERROR, "invalid header size %u\n", hsize); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* sometimes file size is set to some headers size, set a real size in that case */ |
| if (fsize == 14 || fsize == ihsize + 14) |
| fsize = buf_size - 2; |
| |
| if (fsize <= hsize) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Declared file size is less than header size (%u < %u)\n", |
| fsize, hsize); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| switch (ihsize) { |
| case 40: // windib |
| case 56: // windib v3 |
| case 64: // OS/2 v2 |
| case 108: // windib v4 |
| case 124: // windib v5 |
| width = bytestream_get_le32(&buf); |
| height = bytestream_get_le32(&buf); |
| break; |
| case 12: // OS/2 v1 |
| width = bytestream_get_le16(&buf); |
| height = bytestream_get_le16(&buf); |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| /* planes */ |
| if (bytestream_get_le16(&buf) != 1) { |
| av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| depth = bytestream_get_le16(&buf); |
| |
| if (ihsize >= 40) |
| comp = bytestream_get_le32(&buf); |
| else |
| comp = BMP_RGB; |
| |
| if (comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 && |
| comp != BMP_RLE8) { |
| av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (comp == BMP_BITFIELDS) { |
| buf += 20; |
| rgb[0] = bytestream_get_le32(&buf); |
| rgb[1] = bytestream_get_le32(&buf); |
| rgb[2] = bytestream_get_le32(&buf); |
| if (ihsize > 40) |
| alpha = bytestream_get_le32(&buf); |
| } |
| |
| avctx->width = width; |
| avctx->height = height > 0 ? height : -height; |
| |
| avctx->pix_fmt = AV_PIX_FMT_NONE; |
| |
| switch (depth) { |
| case 32: |
| if (comp == BMP_BITFIELDS) { |
| if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00) |
| avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR; |
| else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF) |
| avctx->pix_fmt = alpha ? AV_PIX_FMT_BGRA : AV_PIX_FMT_BGR0; |
| else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000) |
| avctx->pix_fmt = alpha ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB; |
| else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000) |
| avctx->pix_fmt = alpha ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB0; |
| else { |
| av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]); |
| return AVERROR(EINVAL); |
| } |
| } else { |
| avctx->pix_fmt = AV_PIX_FMT_BGRA; |
| } |
| break; |
| case 24: |
| avctx->pix_fmt = AV_PIX_FMT_BGR24; |
| break; |
| case 16: |
| if (comp == BMP_RGB) |
| avctx->pix_fmt = AV_PIX_FMT_RGB555; |
| else if (comp == BMP_BITFIELDS) { |
| if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F) |
| avctx->pix_fmt = AV_PIX_FMT_RGB565; |
| else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F) |
| avctx->pix_fmt = AV_PIX_FMT_RGB555; |
| else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F) |
| avctx->pix_fmt = AV_PIX_FMT_RGB444; |
| else { |
| av_log(avctx, AV_LOG_ERROR, |
| "Unknown bitfields %0"PRIX32" %0"PRIX32" %0"PRIX32"\n", |
| rgb[0], rgb[1], rgb[2]); |
| return AVERROR(EINVAL); |
| } |
| } |
| break; |
| case 8: |
| if (hsize - ihsize - 14 > 0) |
| avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| else |
| avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
| break; |
| case 1: |
| case 4: |
| if (hsize - ihsize - 14 > 0) { |
| avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| } else { |
| av_log(avctx, AV_LOG_ERROR, "Unknown palette for %u-colour BMP\n", |
| 1 << depth); |
| return AVERROR_INVALIDDATA; |
| } |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "depth %u not supported\n", depth); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (avctx->pix_fmt == AV_PIX_FMT_NONE) { |
| av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| return ret; |
| p->pict_type = AV_PICTURE_TYPE_I; |
| p->key_frame = 1; |
| |
| buf = buf0 + hsize; |
| dsize = buf_size - hsize; |
| |
| /* Line size in file multiple of 4 */ |
| n = ((avctx->width * depth + 31) / 8) & ~3; |
| |
| if (n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8) { |
| n = (avctx->width * depth + 7) / 8; |
| if (n * avctx->height > dsize) { |
| av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n", |
| dsize, n * avctx->height); |
| return AVERROR_INVALIDDATA; |
| } |
| av_log(avctx, AV_LOG_ERROR, "data size too small, assuming missing line alignment\n"); |
| } |
| |
| // RLE may skip decoding some picture areas, so blank picture before decoding |
| if (comp == BMP_RLE4 || comp == BMP_RLE8) |
| memset(p->data[0], 0, avctx->height * p->linesize[0]); |
| |
| if (height > 0) { |
| ptr = p->data[0] + (avctx->height - 1) * p->linesize[0]; |
| linesize = -p->linesize[0]; |
| } else { |
| ptr = p->data[0]; |
| linesize = p->linesize[0]; |
| } |
| |
| if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { |
| int colors = 1 << depth; |
| |
| memset(p->data[1], 0, 1024); |
| |
| if (ihsize >= 36) { |
| int t; |
| buf = buf0 + 46; |
| t = bytestream_get_le32(&buf); |
| if (t < 0 || t > (1 << depth)) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Incorrect number of colors - %X for bitdepth %u\n", |
| t, depth); |
| } else if (t) { |
| colors = t; |
| } |
| } else { |
| colors = FFMIN(256, (hsize-ihsize-14) / 3); |
| } |
| buf = buf0 + 14 + ihsize; //palette location |
| // OS/2 bitmap, 3 bytes per palette entry |
| if ((hsize-ihsize-14) < (colors << 2)) { |
| if ((hsize-ihsize-14) < colors * 3) { |
| av_log(avctx, AV_LOG_ERROR, "palette doesn't fit in packet\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| for (i = 0; i < colors; i++) |
| ((uint32_t*)p->data[1])[i] = (0xFFU<<24) | bytestream_get_le24(&buf); |
| } else { |
| for (i = 0; i < colors; i++) |
| ((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf); |
| } |
| buf = buf0 + hsize; |
| } |
| if (comp == BMP_RLE4 || comp == BMP_RLE8) { |
| if (comp == BMP_RLE8 && height < 0) { |
| p->data[0] += p->linesize[0] * (avctx->height - 1); |
| p->linesize[0] = -p->linesize[0]; |
| } |
| bytestream2_init(&gb, buf, dsize); |
| ff_msrle_decode(avctx, p, depth, &gb); |
| if (height < 0) { |
| p->data[0] += p->linesize[0] * (avctx->height - 1); |
| p->linesize[0] = -p->linesize[0]; |
| } |
| } else { |
| switch (depth) { |
| case 1: |
| for (i = 0; i < avctx->height; i++) { |
| int j; |
| for (j = 0; j < n; j++) { |
| ptr[j*8+0] = buf[j] >> 7; |
| ptr[j*8+1] = (buf[j] >> 6) & 1; |
| ptr[j*8+2] = (buf[j] >> 5) & 1; |
| ptr[j*8+3] = (buf[j] >> 4) & 1; |
| ptr[j*8+4] = (buf[j] >> 3) & 1; |
| ptr[j*8+5] = (buf[j] >> 2) & 1; |
| ptr[j*8+6] = (buf[j] >> 1) & 1; |
| ptr[j*8+7] = buf[j] & 1; |
| } |
| buf += n; |
| ptr += linesize; |
| } |
| break; |
| case 8: |
| case 24: |
| case 32: |
| for (i = 0; i < avctx->height; i++) { |
| memcpy(ptr, buf, n); |
| buf += n; |
| ptr += linesize; |
| } |
| break; |
| case 4: |
| for (i = 0; i < avctx->height; i++) { |
| int j; |
| for (j = 0; j < n; j++) { |
| ptr[j*2+0] = (buf[j] >> 4) & 0xF; |
| ptr[j*2+1] = buf[j] & 0xF; |
| } |
| buf += n; |
| ptr += linesize; |
| } |
| break; |
| case 16: |
| for (i = 0; i < avctx->height; i++) { |
| const uint16_t *src = (const uint16_t *) buf; |
| uint16_t *dst = (uint16_t *) ptr; |
| |
| for (j = 0; j < avctx->width; j++) |
| *dst++ = av_le2ne16(*src++); |
| |
| buf += n; |
| ptr += linesize; |
| } |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| if (avctx->pix_fmt == AV_PIX_FMT_BGRA) { |
| for (i = 0; i < avctx->height; i++) { |
| int j; |
| uint8_t *ptr = p->data[0] + p->linesize[0]*i + 3; |
| for (j = 0; j < avctx->width; j++) { |
| if (ptr[4*j]) |
| break; |
| } |
| if (j < avctx->width) |
| break; |
| } |
| if (i == avctx->height) |
| avctx->pix_fmt = p->format = AV_PIX_FMT_BGR0; |
| } |
| |
| *got_frame = 1; |
| |
| return buf_size; |
| } |
| |
| AVCodec ff_bmp_decoder = { |
| .name = "bmp", |
| .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_BMP, |
| .decode = bmp_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
