diff options
Diffstat (limited to 'libavcodec/avrndec.c')
| -rw-r--r-- | libavcodec/avrndec.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/libavcodec/avrndec.c b/libavcodec/avrndec.c new file mode 100644 index 0000000000..695c4912f8 --- /dev/null +++ b/libavcodec/avrndec.c @@ -0,0 +1,173 @@ +/* + * AVRn decoder + * Copyright (c) 2012 Michael Niedermayer + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "avcodec.h" +#include "internal.h" +#include "mjpeg.h" +#include "mjpegdec.h" +#include "libavutil/imgutils.h" + +typedef struct { + AVCodecContext *mjpeg_avctx; + int is_mjpeg; + int interlace; //FIXME use frame.interlaced_frame + int tff; +} AVRnContext; + +static av_cold int init(AVCodecContext *avctx) +{ + AVRnContext *a = avctx->priv_data; + int ret; + + // Support "Resolution 1:1" for Avid AVI Codec + a->is_mjpeg = avctx->extradata_size < 31 || memcmp(&avctx->extradata[28], "1:1", 3); + + if(!a->is_mjpeg && avctx->lowres) { + av_log(avctx, AV_LOG_ERROR, "lowres is not possible with rawvideo\n"); + return AVERROR(EINVAL); + } + + if(a->is_mjpeg) { + AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG); + AVDictionary *thread_opt = NULL; + if (!codec) { + av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n"); + return AVERROR_DECODER_NOT_FOUND; + } + + a->mjpeg_avctx = avcodec_alloc_context3(codec); + + av_dict_set(&thread_opt, "threads", "1", 0); // Is this needed ? + a->mjpeg_avctx->refcounted_frames = 1; + a->mjpeg_avctx->flags = avctx->flags; + a->mjpeg_avctx->idct_algo = avctx->idct_algo; + a->mjpeg_avctx->lowres = avctx->lowres; + a->mjpeg_avctx->width = avctx->width; + a->mjpeg_avctx->height = avctx->height; + + if ((ret = ff_codec_open2_recursive(a->mjpeg_avctx, codec, &thread_opt)) < 0) { + av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n"); + } + av_dict_free(&thread_opt); + + return ret; + } + + if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) + return ret; + + avctx->pix_fmt = AV_PIX_FMT_UYVY422; + + if(avctx->extradata_size >= 9 && avctx->extradata[4]+28 < avctx->extradata_size) { + int ndx = avctx->extradata[4] + 4; + a->interlace = !memcmp(avctx->extradata + ndx, "1:1(", 4); + if(a->interlace) { + a->tff = avctx->extradata[ndx + 24] == 1; + } + } + + return 0; +} + +static av_cold int end(AVCodecContext *avctx) +{ + AVRnContext *a = avctx->priv_data; + + avcodec_close(a->mjpeg_avctx); + av_freep(&a->mjpeg_avctx); + + return 0; +} + +static int decode_frame(AVCodecContext *avctx, void *data, + int *got_frame, AVPacket *avpkt) +{ + AVRnContext *a = avctx->priv_data; + AVFrame *p = data; + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + int y, ret, true_height; + + if(a->is_mjpeg) { + ret = avcodec_decode_video2(a->mjpeg_avctx, data, got_frame, avpkt); + + if (ret >= 0 && *got_frame && avctx->width <= p->width && avctx->height <= p->height) { + int shift = p->height - avctx->height; + int subsample_h, subsample_v; + + av_pix_fmt_get_chroma_sub_sample(p->format, &subsample_h, &subsample_v); + + p->data[0] += p->linesize[0] * shift; + if (p->data[2]) { + p->data[1] += p->linesize[1] * (shift>>subsample_v); + p->data[2] += p->linesize[2] * (shift>>subsample_v); + } + + p->width = avctx->width; + p->height = avctx->height; + } + avctx->pix_fmt = a->mjpeg_avctx->pix_fmt; + return ret; + } + + true_height = buf_size / (2*avctx->width); + + if(buf_size < 2*avctx->width * avctx->height) { + av_log(avctx, AV_LOG_ERROR, "packet too small\n"); + return AVERROR_INVALIDDATA; + } + + if ((ret = ff_get_buffer(avctx, p, 0)) < 0) + return ret; + p->pict_type= AV_PICTURE_TYPE_I; + p->key_frame= 1; + + if(a->interlace) { + buf += (true_height - avctx->height)*avctx->width; + for(y = 0; y < avctx->height-1; y+=2) { + memcpy(p->data[0] + (y+ a->tff)*p->linesize[0], buf , 2*avctx->width); + memcpy(p->data[0] + (y+!a->tff)*p->linesize[0], buf + avctx->width*true_height+4, 2*avctx->width); + buf += 2*avctx->width; + } + } else { + buf += (true_height - avctx->height)*avctx->width*2; + for(y = 0; y < avctx->height; y++) { + memcpy(p->data[0] + y*p->linesize[0], buf, 2*avctx->width); + buf += 2*avctx->width; + } + } + + *got_frame = 1; + return buf_size; +} + +AVCodec ff_avrn_decoder = { + .name = "avrn", + .long_name = NULL_IF_CONFIG_SMALL("Avid AVI Codec"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_AVRN, + .priv_data_size = sizeof(AVRnContext), + .init = init, + .close = end, + .decode = decode_frame, + .capabilities = AV_CODEC_CAP_DR1, + .max_lowres = 3, +}; |