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
25 #include "libavutil/imgutils.h"
28 MJpegDecodeContext mjpeg_ctx;
31 int interlace; //FIXME use frame.interlaced_frame
35 static av_cold int init(AVCodecContext *avctx)
37 AVRnContext *a = avctx->priv_data;
40 // Support "Resolution 1:1" for Avid AVI Codec
41 a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3);
43 if(!a->is_mjpeg && avctx->lowres) {
44 av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n");
45 return AVERROR(EINVAL);
49 return ff_mjpeg_decode_init(avctx);
51 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
54 avcodec_get_frame_defaults(&a->frame);
55 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
57 if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) {
58 int ndx = avctx->extradata[4] + 4;
59 a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4);
61 a->tff = avctx->extradata[ndx + 24] == 1;
68 static av_cold int end(AVCodecContext *avctx)
70 AVRnContext *a = avctx->priv_data;
71 AVFrame *p = &a->frame;
74 avctx->release_buffer(avctx, p);
77 ff_mjpeg_decode_end(avctx);
82 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
84 AVRnContext *a = avctx->priv_data;
85 AVFrame *p = &a->frame;
86 const uint8_t *buf = avpkt->data;
87 int buf_size = avpkt->size;
88 int y, ret, true_height;
91 return ff_mjpeg_decode_frame(avctx, data, data_size, avpkt);
93 true_height = buf_size / (2*avctx->width);
95 avctx->release_buffer(avctx, p);
97 if(buf_size < 2*avctx->width * avctx->height) {
98 av_log(avctx, AV_LOG_ERROR, "packet too small\n");
99 return AVERROR_INVALIDDATA;
102 if((ret = avctx->get_buffer(avctx, p)) < 0){
103 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
106 p->pict_type= AV_PICTURE_TYPE_I;
110 buf += (true_height - avctx->height)*avctx->width;
111 for(y = 0; y < avctx->height-1; y+=2) {
112 memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width);
113 memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width);
114 buf += 2*avctx->width;
117 buf += (true_height - avctx->height)*avctx->width*2;
118 for(y = 0; y < avctx->height; y++) {
119 memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width);
120 buf += 2*avctx->width;
124 *(AVFrame*)data = a->frame;
125 *data_size = sizeof(AVFrame);
129 AVCodec ff_avrn_decoder = {
131 .type = AVMEDIA_TYPE_VIDEO,
132 .id = AV_CODEC_ID_AVRN,
133 .priv_data_size = sizeof(AVRnContext),
136 .decode = decode_frame,
137 .long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"),
138 .capabilities = CODEC_CAP_DR1,