3 * Copyright (c) 2012 Michael Niedermayer
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "libavutil/imgutils.h"
29 MJpegDecodeContext mjpeg_ctx;
32 int interlace; //FIXME use frame.interlaced_frame
36 static av_cold int init(AVCodecContext *avctx)
38 AVRnContext *a = avctx->priv_data;
41 // Support "Resolution 1:1" for Avid AVI Codec
42 a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3);
44 if(!a->is_mjpeg && avctx->lowres) {
45 av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n");
46 return AVERROR(EINVAL);
50 return ff_mjpeg_decode_init(avctx);
52 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
55 avcodec_get_frame_defaults(&a->frame);
56 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
58 if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) {
59 int ndx = avctx->extradata[4] + 4;
60 a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4);
62 a->tff = avctx->extradata[ndx + 24] == 1;
69 static av_cold int end(AVCodecContext *avctx)
71 AVRnContext *a = avctx->priv_data;
72 AVFrame *p = &a->frame;
75 avctx->release_buffer(avctx, p);
78 ff_mjpeg_decode_end(avctx);
83 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
85 AVRnContext *a = avctx->priv_data;
86 AVFrame *p = &a->frame;
87 const uint8_t *buf = avpkt->data;
88 int buf_size = avpkt->size;
89 int y, ret, true_height;
92 return ff_mjpeg_decode_frame(avctx, data, data_size, avpkt);
94 true_height = buf_size / (2*avctx->width);
96 avctx->release_buffer(avctx, p);
98 if(buf_size < 2*avctx->width * avctx->height) {
99 av_log(avctx, AV_LOG_ERROR, "packet too small\n");
100 return AVERROR_INVALIDDATA;
103 if((ret = ff_get_buffer(avctx, p)) < 0){
104 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
107 p->pict_type= AV_PICTURE_TYPE_I;
111 buf += (true_height - avctx->height)*avctx->width;
112 for(y = 0; y < avctx->height-1; y+=2) {
113 memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width);
114 memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width);
115 buf += 2*avctx->width;
118 buf += (true_height - avctx->height)*avctx->width*2;
119 for(y = 0; y < avctx->height; y++) {
120 memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width);
121 buf += 2*avctx->width;
125 *(AVFrame*)data = a->frame;
126 *data_size = sizeof(AVFrame);
130 AVCodec ff_avrn_decoder = {
132 .type = AVMEDIA_TYPE_VIDEO,
133 .id = AV_CODEC_ID_AVRN,
134 .priv_data_size = sizeof(AVRnContext),
137 .decode = decode_frame,
138 .long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"),
139 .capabilities = CODEC_CAP_DR1,