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/* |
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* AVRn decoder |
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* Copyright (c) 2012 Michael Niedermayer |
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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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#include "avcodec.h" |
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#include "internal.h" |
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#include "mjpeg.h" |
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#include "mjpegdec.h" |
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#include "libavutil/imgutils.h" |
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typedef struct { |
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AVCodecContext *mjpeg_avctx; |
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int is_mjpeg; |
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int interlace; |
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int tff; |
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} AVRnContext; |
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static av_cold int init(AVCodecContext *avctx) |
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{ |
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AVRnContext *a = avctx->priv_data; |
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int ret; |
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// Support "Resolution 1:1" for Avid AVI Codec |
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a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3); |
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if(!a->is_mjpeg && avctx->lowres) { |
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av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n"); |
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return AVERROR(EINVAL); |
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} |
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if(a->is_mjpeg) { |
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AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG); |
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AVDictionary *thread_opt = NULL; |
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if (!codec) { |
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av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n"); |
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return AVERROR_DECODER_NOT_FOUND; |
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} |
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a->mjpeg_avctx = avcodec_alloc_context3(codec); |
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av_dict_set(&thread_opt, "threads", "1", 0); // Is this needed ? |
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a->mjpeg_avctx->refcounted_frames = 1; |
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a->mjpeg_avctx->flags = avctx->flags; |
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a->mjpeg_avctx->idct_algo = avctx->idct_algo; |
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a->mjpeg_avctx->lowres = avctx->lowres; |
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a->mjpeg_avctx->width = avctx->width; |
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a->mjpeg_avctx->height = avctx->height; |
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if ((ret = ff_codec_open2_recursive(a->mjpeg_avctx, codec, &thread_opt)) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n"); |
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} |
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av_dict_free(&thread_opt); |
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return ret; |
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} |
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if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) |
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return ret; |
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avctx->pix_fmt = AV_PIX_FMT_UYVY422; |
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if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) { |
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int ndx = avctx->extradata[4] + 4; |
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a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4); |
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if(a->interlace) { |
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a->tff = avctx->extradata[ndx + 24] == 1; |
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} |
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} |
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return 0; |
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} |
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static av_cold int end(AVCodecContext *avctx) |
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{ |
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AVRnContext *a = avctx->priv_data; |
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avcodec_free_context(&a->mjpeg_avctx); |
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return 0; |
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} |
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static int decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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AVRnContext *a = avctx->priv_data; |
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AVFrame *p = data; |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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int y, ret, true_height; |
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if(a->is_mjpeg) { |
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ret = avcodec_decode_video2(a->mjpeg_avctx, data, got_frame, avpkt); |
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if (ret >= 0 && *got_frame && avctx->width <= p->width && avctx->height <= p->height) { |
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int shift = p->height - avctx->height; |
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int subsample_h, subsample_v; |
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av_pix_fmt_get_chroma_sub_sample(p->format, &subsample_h, &subsample_v); |
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p->data[0] += p->linesize[0] * shift; |
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if (p->data[2]) { |
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p->data[1] += p->linesize[1] * (shift>>subsample_v); |
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p->data[2] += p->linesize[2] * (shift>>subsample_v); |
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} |
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p->width = avctx->width; |
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p->height = avctx->height; |
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} |
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avctx->pix_fmt = a->mjpeg_avctx->pix_fmt; |
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return ret; |
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} |
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true_height = buf_size / (2*avctx->width); |
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if(buf_size < 2*avctx->width * avctx->height) { |
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av_log(avctx, AV_LOG_ERROR, "packet too small\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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return ret; |
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p->pict_type= AV_PICTURE_TYPE_I; |
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p->key_frame= 1; |
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if(a->interlace) { |
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buf += (true_height - avctx->height)*avctx->width; |
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for(y = 0; y < avctx->height-1; y+=2) { |
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memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width); |
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memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width); |
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buf += 2*avctx->width; |
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} |
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} else { |
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buf += (true_height - avctx->height)*avctx->width*2; |
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for(y = 0; y < avctx->height; y++) { |
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memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width); |
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buf += 2*avctx->width; |
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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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AVCodec ff_avrn_decoder = { |
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.name = "avrn", |
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.long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_AVRN, |
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.priv_data_size = sizeof(AVRnContext), |
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.init = init, |
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.close = end, |
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.decode = decode_frame, |
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.max_lowres = 3, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
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}; |