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4243da4ff4
This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
173 lines
5.4 KiB
C
173 lines
5.4 KiB
C
/*
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* Bethesda VID video decoder
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* Copyright (C) 2007 Nicholas Tung
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; 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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* @file
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* @brief Bethesda Softworks VID Video Decoder
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* @author Nicholas Tung [ntung (at. ntung com] (2007-03)
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* @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
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* @see http://www.svatopluk.com/andux/docs/dfvid.html
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*/
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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "bethsoftvideo.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "internal.h"
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typedef struct BethsoftvidContext {
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AVFrame *frame;
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GetByteContext g;
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} BethsoftvidContext;
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static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx)
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{
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BethsoftvidContext *vid = avctx->priv_data;
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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vid->frame = av_frame_alloc();
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if (!vid->frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int set_palette(BethsoftvidContext *ctx)
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{
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uint32_t *palette = (uint32_t *)ctx->frame->data[1];
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int a;
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if (bytestream2_get_bytes_left(&ctx->g) < 256*3)
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return AVERROR_INVALIDDATA;
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for(a = 0; a < 256; a++){
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palette[a] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->g) * 4;
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palette[a] |= palette[a] >> 6 & 0x30303;
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}
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ctx->frame->palette_has_changed = 1;
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return 0;
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}
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static int bethsoftvid_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
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int *got_frame, AVPacket *avpkt)
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{
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BethsoftvidContext * vid = avctx->priv_data;
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char block_type;
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uint8_t * dst;
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uint8_t * frame_end;
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int remaining = avctx->width; // number of bytes remaining on a line
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int wrap_to_next_line;
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int code, ret;
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int yoffset;
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if ((ret = ff_reget_buffer(avctx, vid->frame, 0)) < 0)
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return ret;
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wrap_to_next_line = vid->frame->linesize[0] - avctx->width;
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if (avpkt->side_data_elems > 0 &&
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avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) {
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bytestream2_init(&vid->g, avpkt->side_data[0].data,
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avpkt->side_data[0].size);
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if ((ret = set_palette(vid)) < 0)
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return ret;
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}
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bytestream2_init(&vid->g, avpkt->data, avpkt->size);
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dst = vid->frame->data[0];
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frame_end = vid->frame->data[0] + vid->frame->linesize[0] * avctx->height;
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switch(block_type = bytestream2_get_byte(&vid->g)){
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case PALETTE_BLOCK: {
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*got_frame = 0;
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if ((ret = set_palette(vid)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "error reading palette\n");
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return ret;
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}
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return bytestream2_tell(&vid->g);
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}
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case VIDEO_YOFF_P_FRAME:
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yoffset = bytestream2_get_le16(&vid->g);
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if(yoffset >= avctx->height)
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return AVERROR_INVALIDDATA;
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dst += vid->frame->linesize[0] * yoffset;
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case VIDEO_P_FRAME:
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case VIDEO_I_FRAME:
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break;
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default:
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return AVERROR_INVALIDDATA;
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}
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// main code
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while((code = bytestream2_get_byte(&vid->g))){
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int length = code & 0x7f;
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// copy any bytes starting at the current position, and ending at the frame width
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while(length > remaining){
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if(code < 0x80)
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bytestream2_get_buffer(&vid->g, dst, remaining);
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else if(block_type == VIDEO_I_FRAME)
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memset(dst, bytestream2_peek_byte(&vid->g), remaining);
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length -= remaining; // decrement the number of bytes to be copied
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dst += remaining + wrap_to_next_line; // skip over extra bytes at end of frame
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remaining = avctx->width;
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if(dst == frame_end)
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goto end;
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}
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// copy any remaining bytes after / if line overflows
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if(code < 0x80)
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bytestream2_get_buffer(&vid->g, dst, length);
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else if(block_type == VIDEO_I_FRAME)
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memset(dst, bytestream2_get_byte(&vid->g), length);
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remaining -= length;
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dst += length;
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}
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end:
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if ((ret = av_frame_ref(rframe, vid->frame)) < 0)
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return ret;
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*got_frame = 1;
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return avpkt->size;
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}
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static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx)
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{
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BethsoftvidContext * vid = avctx->priv_data;
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av_frame_free(&vid->frame);
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return 0;
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}
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const FFCodec ff_bethsoftvid_decoder = {
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.p.name = "bethsoftvid",
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.p.long_name = NULL_IF_CONFIG_SMALL("Bethesda VID video"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_BETHSOFTVID,
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.priv_data_size = sizeof(BethsoftvidContext),
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.init = bethsoftvid_decode_init,
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.close = bethsoftvid_decode_end,
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FF_CODEC_DECODE_CB(bethsoftvid_decode_frame),
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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