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| /* |
| * Bethesda VID video decoder |
| * Copyright (C) 2007 Nicholas Tung |
| * |
| * 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 |
| * @brief Bethesda Softworks VID Video Decoder |
| * @author Nicholas Tung [ntung (at. ntung com] (2007-03) |
| * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID |
| * @see http://www.svatopluk.com/andux/docs/dfvid.html |
| */ |
| |
| #include "libavutil/common.h" |
| #include "avcodec.h" |
| #include "bethsoftvideo.h" |
| #include "bytestream.h" |
| #include "internal.h" |
| |
| typedef struct BethsoftvidContext { |
| AVFrame frame; |
| GetByteContext g; |
| } BethsoftvidContext; |
| |
| static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx) |
| { |
| BethsoftvidContext *vid = avctx->priv_data; |
| avcodec_get_frame_defaults(&vid->frame); |
| avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| return 0; |
| } |
| |
| static int set_palette(BethsoftvidContext *ctx) |
| { |
| uint32_t *palette = (uint32_t *)ctx->frame.data[1]; |
| int a; |
| |
| if (bytestream2_get_bytes_left(&ctx->g) < 256*3) |
| return AVERROR_INVALIDDATA; |
| |
| for(a = 0; a < 256; a++){ |
| palette[a] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->g) * 4; |
| palette[a] |= palette[a] >> 6 & 0x30303; |
| } |
| ctx->frame.palette_has_changed = 1; |
| return 0; |
| } |
| |
| static int bethsoftvid_decode_frame(AVCodecContext *avctx, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| BethsoftvidContext * vid = avctx->priv_data; |
| char block_type; |
| uint8_t * dst; |
| uint8_t * frame_end; |
| int remaining = avctx->width; // number of bytes remaining on a line |
| int wrap_to_next_line; |
| int code, ret; |
| int yoffset; |
| |
| if ((ret = ff_reget_buffer(avctx, &vid->frame)) < 0) |
| return ret; |
| wrap_to_next_line = vid->frame.linesize[0] - avctx->width; |
| |
| if (avpkt->side_data_elems > 0 && |
| avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) { |
| bytestream2_init(&vid->g, avpkt->side_data[0].data, |
| avpkt->side_data[0].size); |
| if ((ret = set_palette(vid)) < 0) |
| return ret; |
| } |
| |
| bytestream2_init(&vid->g, avpkt->data, avpkt->size); |
| dst = vid->frame.data[0]; |
| frame_end = vid->frame.data[0] + vid->frame.linesize[0] * avctx->height; |
| |
| switch(block_type = bytestream2_get_byte(&vid->g)){ |
| case PALETTE_BLOCK: { |
| *got_frame = 0; |
| if ((ret = set_palette(vid)) < 0) { |
| av_log(avctx, AV_LOG_ERROR, "error reading palette\n"); |
| return ret; |
| } |
| return bytestream2_tell(&vid->g); |
| } |
| case VIDEO_YOFF_P_FRAME: |
| yoffset = bytestream2_get_le16(&vid->g); |
| if(yoffset >= avctx->height) |
| return AVERROR_INVALIDDATA; |
| dst += vid->frame.linesize[0] * yoffset; |
| } |
| |
| // main code |
| while((code = bytestream2_get_byte(&vid->g))){ |
| int length = code & 0x7f; |
| |
| // copy any bytes starting at the current position, and ending at the frame width |
| while(length > remaining){ |
| if(code < 0x80) |
| bytestream2_get_buffer(&vid->g, dst, remaining); |
| else if(block_type == VIDEO_I_FRAME) |
| memset(dst, bytestream2_peek_byte(&vid->g), remaining); |
| length -= remaining; // decrement the number of bytes to be copied |
| dst += remaining + wrap_to_next_line; // skip over extra bytes at end of frame |
| remaining = avctx->width; |
| if(dst == frame_end) |
| goto end; |
| } |
| |
| // copy any remaining bytes after / if line overflows |
| if(code < 0x80) |
| bytestream2_get_buffer(&vid->g, dst, length); |
| else if(block_type == VIDEO_I_FRAME) |
| memset(dst, bytestream2_get_byte(&vid->g), length); |
| remaining -= length; |
| dst += length; |
| } |
| end: |
| |
| if ((ret = av_frame_ref(data, &vid->frame)) < 0) |
| return ret; |
| |
| *got_frame = 1; |
| |
| return avpkt->size; |
| } |
| |
| static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx) |
| { |
| BethsoftvidContext * vid = avctx->priv_data; |
| av_frame_unref(&vid->frame); |
| return 0; |
| } |
| |
| AVCodec ff_bethsoftvid_decoder = { |
| .name = "bethsoftvid", |
| .long_name = NULL_IF_CONFIG_SMALL("Bethesda VID video"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_BETHSOFTVID, |
| .priv_data_size = sizeof(BethsoftvidContext), |
| .init = bethsoftvid_decode_init, |
| .close = bethsoftvid_decode_end, |
| .decode = bethsoftvid_decode_frame, |
| .capabilities = CODEC_CAP_DR1, |
| }; |