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a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
205 lines
6.4 KiB
C
205 lines
6.4 KiB
C
/*
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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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const 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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const 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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