205 lines
6.4 KiB
C
Executable File
205 lines
6.4 KiB
C
Executable File
/*
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* Creative YUV (CYUV) Video Decoder
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* by Mike Melanson (melanson@pcisys.net)
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* based on "Creative YUV (CYUV) stream format for AVI":
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* http://www.csse.monash.edu.au/~timf/videocodec/cyuv.txt
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*
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* Copyright (C) 2003 The FFmpeg project
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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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* Creative YUV (CYUV) Video Decoder.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "avcodec.h"
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#include "internal.h"
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#include "libavutil/internal.h"
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typedef struct CyuvDecodeContext {
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AVCodecContext *avctx;
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int width, height;
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} CyuvDecodeContext;
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static av_cold int cyuv_decode_init(AVCodecContext *avctx)
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{
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CyuvDecodeContext *s = avctx->priv_data;
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s->avctx = avctx;
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s->width = avctx->width;
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/* width needs to be divisible by 4 for this codec to work */
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if (s->width & 0x3)
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return AVERROR_INVALIDDATA;
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s->height = avctx->height;
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return 0;
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}
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static int cyuv_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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CyuvDecodeContext *s=avctx->priv_data;
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AVFrame *frame = data;
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unsigned char *y_plane;
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unsigned char *u_plane;
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unsigned char *v_plane;
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int y_ptr;
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int u_ptr;
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int v_ptr;
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/* prediction error tables (make it clear that they are signed values) */
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const signed char *y_table = (const signed char*)buf + 0;
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const signed char *u_table = (const signed char*)buf + 16;
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const signed char *v_table = (const signed char*)buf + 32;
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unsigned char y_pred, u_pred, v_pred;
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int stream_ptr;
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unsigned char cur_byte;
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int pixel_groups;
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int rawsize = s->height * FFALIGN(s->width,2) * 2;
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int ret;
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if (avctx->codec_id == AV_CODEC_ID_AURA) {
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y_table = u_table;
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u_table = v_table;
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}
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/* sanity check the buffer size: A buffer has 3x16-bytes tables
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* followed by (height) lines each with 3 bytes to represent groups
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* of 4 pixels. Thus, the total size of the buffer ought to be:
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* (3 * 16) + height * (width * 3 / 4) */
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if (buf_size == 48 + s->height * (s->width * 3 / 4)) {
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avctx->pix_fmt = AV_PIX_FMT_YUV411P;
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} else if(buf_size == rawsize ) {
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avctx->pix_fmt = AV_PIX_FMT_UYVY422;
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} else {
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av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n",
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buf_size, 48 + s->height * (s->width * 3 / 4));
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return AVERROR_INVALIDDATA;
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}
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/* pixel data starts 48 bytes in, after 3x16-byte tables */
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stream_ptr = 48;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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y_plane = frame->data[0];
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u_plane = frame->data[1];
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v_plane = frame->data[2];
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if (buf_size == rawsize) {
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int linesize = FFALIGN(s->width,2) * 2;
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y_plane += frame->linesize[0] * s->height;
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for (stream_ptr = 0; stream_ptr < rawsize; stream_ptr += linesize) {
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y_plane -= frame->linesize[0];
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memcpy(y_plane, buf+stream_ptr, linesize);
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}
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} else {
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/* iterate through each line in the height */
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for (y_ptr = 0, u_ptr = 0, v_ptr = 0;
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y_ptr < (s->height * frame->linesize[0]);
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y_ptr += frame->linesize[0] - s->width,
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u_ptr += frame->linesize[1] - s->width / 4,
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v_ptr += frame->linesize[2] - s->width / 4) {
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/* reset predictors */
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cur_byte = buf[stream_ptr++];
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u_plane[u_ptr++] = u_pred = cur_byte & 0xF0;
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y_plane[y_ptr++] = y_pred = (cur_byte & 0x0F) << 4;
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cur_byte = buf[stream_ptr++];
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v_plane[v_ptr++] = v_pred = cur_byte & 0xF0;
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y_pred += y_table[cur_byte & 0x0F];
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y_plane[y_ptr++] = y_pred;
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cur_byte = buf[stream_ptr++];
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y_pred += y_table[cur_byte & 0x0F];
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y_plane[y_ptr++] = y_pred;
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y_pred += y_table[(cur_byte & 0xF0) >> 4];
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y_plane[y_ptr++] = y_pred;
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/* iterate through the remaining pixel groups (4 pixels/group) */
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pixel_groups = s->width / 4 - 1;
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while (pixel_groups--) {
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cur_byte = buf[stream_ptr++];
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u_pred += u_table[(cur_byte & 0xF0) >> 4];
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u_plane[u_ptr++] = u_pred;
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y_pred += y_table[cur_byte & 0x0F];
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y_plane[y_ptr++] = y_pred;
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cur_byte = buf[stream_ptr++];
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v_pred += v_table[(cur_byte & 0xF0) >> 4];
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v_plane[v_ptr++] = v_pred;
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y_pred += y_table[cur_byte & 0x0F];
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y_plane[y_ptr++] = y_pred;
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cur_byte = buf[stream_ptr++];
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y_pred += y_table[cur_byte & 0x0F];
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y_plane[y_ptr++] = y_pred;
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y_pred += y_table[(cur_byte & 0xF0) >> 4];
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y_plane[y_ptr++] = y_pred;
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}
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}
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}
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*got_frame = 1;
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return buf_size;
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}
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#if CONFIG_AURA_DECODER
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AVCodec ff_aura_decoder = {
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.name = "aura",
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.long_name = NULL_IF_CONFIG_SMALL("Auravision AURA"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_AURA,
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.priv_data_size = sizeof(CyuvDecodeContext),
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.init = cyuv_decode_init,
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.decode = cyuv_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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#endif
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#if CONFIG_CYUV_DECODER
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AVCodec ff_cyuv_decoder = {
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.name = "cyuv",
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.long_name = NULL_IF_CONFIG_SMALL("Creative YUV (CYUV)"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_CYUV,
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.priv_data_size = sizeof(CyuvDecodeContext),
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.init = cyuv_decode_init,
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.decode = cyuv_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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#endif
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