From d6902070c52151ec1e8154ce9b22283a1d0bc192 Mon Sep 17 00:00:00 2001 From: Nidhi Makhijani Date: Sun, 6 Jul 2014 19:15:52 +0530 Subject: dsicin: Split audio and video decoder Signed-off-by: Diego Biurrun --- libavcodec/dsicinvideo.c | 301 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 301 insertions(+) create mode 100644 libavcodec/dsicinvideo.c (limited to 'libavcodec/dsicinvideo.c') diff --git a/libavcodec/dsicinvideo.c b/libavcodec/dsicinvideo.c new file mode 100644 index 0000000000..b56a581ea3 --- /dev/null +++ b/libavcodec/dsicinvideo.c @@ -0,0 +1,301 @@ +/* + * Delphine Software International CIN video decoder + * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net) + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Delphine Software International CIN video decoder + */ + +#include "avcodec.h" +#include "bytestream.h" +#include "internal.h" + +typedef enum CinVideoBitmapIndex { + CIN_CUR_BMP = 0, /* current */ + CIN_PRE_BMP = 1, /* previous */ + CIN_INT_BMP = 2 /* intermediate */ +} CinVideoBitmapIndex; + +typedef struct CinVideoContext { + AVCodecContext *avctx; + AVFrame *frame; + unsigned int bitmap_size; + uint32_t palette[256]; + uint8_t *bitmap_table[3]; +} CinVideoContext; + +static av_cold int cinvideo_decode_init(AVCodecContext *avctx) +{ + CinVideoContext *cin = avctx->priv_data; + unsigned int i; + + cin->avctx = avctx; + avctx->pix_fmt = AV_PIX_FMT_PAL8; + + cin->frame = av_frame_alloc(); + if (!cin->frame) + return AVERROR(ENOMEM); + + cin->bitmap_size = avctx->width * avctx->height; + for (i = 0; i < 3; ++i) { + cin->bitmap_table[i] = av_mallocz(cin->bitmap_size); + if (!cin->bitmap_table[i]) + av_log(avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n"); + } + + return 0; +} + +static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst, + int size) +{ + while (size--) + *dst++ += *src++; +} + +static int cin_decode_huffman(const unsigned char *src, int src_size, + unsigned char *dst, int dst_size) +{ + int b, huff_code = 0; + unsigned char huff_code_table[15]; + unsigned char *dst_cur = dst; + unsigned char *dst_end = dst + dst_size; + const unsigned char *src_end = src + src_size; + + memcpy(huff_code_table, src, 15); + src += 15; + + while (src < src_end) { + huff_code = *src++; + if ((huff_code >> 4) == 15) { + b = huff_code << 4; + huff_code = *src++; + *dst_cur++ = b | (huff_code >> 4); + } else + *dst_cur++ = huff_code_table[huff_code >> 4]; + if (dst_cur >= dst_end) + break; + + huff_code &= 15; + if (huff_code == 15) { + *dst_cur++ = *src++; + } else + *dst_cur++ = huff_code_table[huff_code]; + if (dst_cur >= dst_end) + break; + } + + return dst_cur - dst; +} + +static int cin_decode_lzss(const unsigned char *src, int src_size, + unsigned char *dst, int dst_size) +{ + uint16_t cmd; + int i, sz, offset, code; + unsigned char *dst_end = dst + dst_size, *dst_start = dst; + const unsigned char *src_end = src + src_size; + + while (src < src_end && dst < dst_end) { + code = *src++; + for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) { + if (code & (1 << i)) { + *dst++ = *src++; + } else { + cmd = AV_RL16(src); + src += 2; + offset = cmd >> 4; + if ((int)(dst - dst_start) < offset + 1) + return AVERROR_INVALIDDATA; + sz = (cmd & 0xF) + 2; + /* don't use memcpy/memmove here as the decoding routine + * (ab)uses buffer overlappings to repeat bytes in the + * destination */ + sz = FFMIN(sz, dst_end - dst); + while (sz--) { + *dst = *(dst - offset - 1); + ++dst; + } + } + } + } + + return 0; +} + +static void cin_decode_rle(const unsigned char *src, int src_size, + unsigned char *dst, int dst_size) +{ + int len, code; + unsigned char *dst_end = dst + dst_size; + const unsigned char *src_end = src + src_size; + + while (src < src_end && dst < dst_end) { + code = *src++; + if (code & 0x80) { + if (src >= src_end) + break; + len = code - 0x7F; + memset(dst, *src++, FFMIN(len, dst_end - dst)); + } else { + len = code + 1; + memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src)); + src += len; + } + dst += len; + } +} + +static int cinvideo_decode_frame(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + CinVideoContext *cin = avctx->priv_data; + int i, y, palette_type, palette_colors_count, + bitmap_frame_type, bitmap_frame_size, res = 0; + + palette_type = buf[0]; + palette_colors_count = AV_RL16(buf + 1); + bitmap_frame_type = buf[3]; + buf += 4; + + bitmap_frame_size = buf_size - 4; + + /* handle palette */ + if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0))) + return AVERROR_INVALIDDATA; + if (palette_type == 0) { + if (palette_colors_count > 256) + return AVERROR_INVALIDDATA; + for (i = 0; i < palette_colors_count; ++i) { + cin->palette[i] = bytestream_get_le24(&buf); + bitmap_frame_size -= 3; + } + } else { + for (i = 0; i < palette_colors_count; ++i) { + cin->palette[buf[0]] = AV_RL24(buf + 1); + buf += 4; + bitmap_frame_size -= 4; + } + } + + bitmap_frame_size = FFMIN(cin->bitmap_size, bitmap_frame_size); + + /* note: the decoding routines below assumes that + * surface.width = surface.pitch */ + switch (bitmap_frame_type) { + case 9: + cin_decode_rle(buf, bitmap_frame_size, + cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); + break; + case 34: + cin_decode_rle(buf, bitmap_frame_size, + cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); + cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP], + cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); + break; + case 35: + cin_decode_huffman(buf, bitmap_frame_size, + cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size); + cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size, + cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); + break; + case 36: + bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size, + cin->bitmap_table[CIN_INT_BMP], + cin->bitmap_size); + cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size, + cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); + cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP], + cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); + break; + case 37: + cin_decode_huffman(buf, bitmap_frame_size, + cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); + break; + case 38: + res = cin_decode_lzss(buf, bitmap_frame_size, + cin->bitmap_table[CIN_CUR_BMP], + cin->bitmap_size); + if (res < 0) + return res; + break; + case 39: + res = cin_decode_lzss(buf, bitmap_frame_size, + cin->bitmap_table[CIN_CUR_BMP], + cin->bitmap_size); + if (res < 0) + return res; + cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP], + cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size); + break; + } + + if ((res = ff_reget_buffer(avctx, cin->frame)) < 0) { + av_log(cin->avctx, AV_LOG_ERROR, + "delphinecinvideo: reget_buffer() failed to allocate a frame\n"); + return res; + } + + memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette)); + cin->frame->palette_has_changed = 1; + for (y = 0; y < cin->avctx->height; ++y) + memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0], + cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width, + cin->avctx->width); + + FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], + cin->bitmap_table[CIN_PRE_BMP]); + + if ((res = av_frame_ref(data, cin->frame)) < 0) + return res; + + *got_frame = 1; + + return buf_size; +} + +static av_cold int cinvideo_decode_end(AVCodecContext *avctx) +{ + CinVideoContext *cin = avctx->priv_data; + int i; + + av_frame_free(&cin->frame); + + for (i = 0; i < 3; ++i) + av_free(cin->bitmap_table[i]); + + return 0; +} + +AVCodec ff_dsicinvideo_decoder = { + .name = "dsicinvideo", + .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_DSICINVIDEO, + .priv_data_size = sizeof(CinVideoContext), + .init = cinvideo_decode_init, + .close = cinvideo_decode_end, + .decode = cinvideo_decode_frame, + .capabilities = CODEC_CAP_DR1, +}; -- cgit v1.2.3