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 AVCodecContext *mjpeg_avctx;
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 const AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
50 AVDictionary *thread_opt = NULL;
52 av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n");
53 return AVERROR_DECODER_NOT_FOUND;
56 a->mjpeg_avctx = avcodec_alloc_context3(codec);
58 av_dict_set(&thread_opt, "threads", "1", 0); // Is this needed ?
59 a->mjpeg_avctx->refcounted_frames = 1;
60 a->mjpeg_avctx->flags = avctx->flags;
61 a->mjpeg_avctx->idct_algo = avctx->idct_algo;
62 a->mjpeg_avctx->lowres = avctx->lowres;
63 a->mjpeg_avctx->width = avctx->width;
64 a->mjpeg_avctx->height = avctx->height;
66 if ((ret = ff_codec_open2_recursive(a->mjpeg_avctx, codec, &thread_opt)) < 0) {
67 av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n");
69 av_dict_free(&thread_opt);
74 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
77 avctx->pix_fmt = AV_PIX_FMT_UYVY422;
79 if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) {
80 int ndx = avctx->extradata[4] + 4;
81 a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4);
83 a->tff = avctx->extradata[ndx + 24] == 1;
90 static av_cold int end(AVCodecContext *avctx)
92 AVRnContext *a = avctx->priv_data;
94 avcodec_free_context(&a->mjpeg_avctx);
99 static int decode_frame(AVCodecContext *avctx, void *data,
100 int *got_frame, AVPacket *avpkt)
102 AVRnContext *a = avctx->priv_data;
104 const uint8_t *buf = avpkt->data;
105 int buf_size = avpkt->size;
106 int y, ret, true_height;
109 ret = avcodec_decode_video2(a->mjpeg_avctx, data, got_frame, avpkt);
111 if (ret >= 0 && *got_frame && avctx->width <= p->width && avctx->height <= p->height) {
112 int shift = p->height - avctx->height;
113 int subsample_h, subsample_v;
115 av_pix_fmt_get_chroma_sub_sample(p->format, &subsample_h, &subsample_v);
117 p->data[0] += p->linesize[0] * shift;
119 p->data[1] += p->linesize[1] * (shift>>subsample_v);
120 p->data[2] += p->linesize[2] * (shift>>subsample_v);
123 p->width = avctx->width;
124 p->height = avctx->height;
126 avctx->pix_fmt = a->mjpeg_avctx->pix_fmt;
130 true_height = buf_size / (2*avctx->width);
132 if(buf_size < 2*avctx->width * avctx->height) {
133 av_log(avctx, AV_LOG_ERROR, "packet too small\n");
134 return AVERROR_INVALIDDATA;
137 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
139 p->pict_type= AV_PICTURE_TYPE_I;
143 buf += (true_height - avctx->height)*avctx->width;
144 for(y = 0; y < avctx->height-1; y+=2) {
145 memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width);
146 memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width);
147 buf += 2*avctx->width;
150 buf += (true_height - avctx->height)*avctx->width*2;
151 for(y = 0; y < avctx->height; y++) {
152 memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width);
153 buf += 2*avctx->width;
161 AVCodec ff_avrn_decoder = {
163 .long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"),
164 .type = AVMEDIA_TYPE_VIDEO,
165 .id = AV_CODEC_ID_AVRN,
166 .priv_data_size = sizeof(AVRnContext),
169 .decode = decode_frame,
171 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,