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author | Mike Melanson <mike@multimedia.cx> | 2003-09-02 04:32:02 +0000 |
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committer | Mike Melanson <mike@multimedia.cx> | 2003-09-02 04:32:02 +0000 |
commit | 3ef8be2bfc89672060a2a2f2b8926b3decb08172 (patch) | |
tree | 10889fe4d2d844deed4952a7f82416ee6bcb9692 /libavcodec/interplayvideo.c | |
parent | 149f7c029ccdc649dc9ee523f1dcf23ab8d0f6ac (diff) | |
download | ffmpeg-streaming-3ef8be2bfc89672060a2a2f2b8926b3decb08172.zip ffmpeg-streaming-3ef8be2bfc89672060a2a2f2b8926b3decb08172.tar.gz |
initial commit for Id RoQ and Interplay MVE multimedia subsystems
Originally committed as revision 2195 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/interplayvideo.c')
-rw-r--r-- | libavcodec/interplayvideo.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/libavcodec/interplayvideo.c b/libavcodec/interplayvideo.c new file mode 100644 index 0000000..c94f16f --- /dev/null +++ b/libavcodec/interplayvideo.c @@ -0,0 +1,145 @@ +/* + * Interplay MVE Video Decoder + * Copyright (C) 2003 the ffmpeg project + * + * This library 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 of the License, or (at your option) any later version. + * + * This library 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 this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +/** + * @file roqvideo.c + * Interplay MVE Video Decoder by Mike Melanson + * For more information about the Interplay MVE format, visit: + * http://www.pcisys.net/~melanson/codecs/ + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "common.h" +#include "avcodec.h" +#include "dsputil.h" + +typedef struct IpvideoContext { + + AVCodecContext *avctx; + DSPContext dsp; + AVFrame last_frame; + AVFrame current_frame; + int first_frame; + int receiving_decoding_map; + unsigned char *decoding_map; + int decoding_map_size; + + unsigned char *buf; + int size; + +} IpvideoContext; + +static int ipvideo_decode_init(AVCodecContext *avctx) +{ + IpvideoContext *s = avctx->priv_data; + + s->avctx = avctx; + avctx->pix_fmt = PIX_FMT_YUV444P; + avctx->has_b_frames = 0; + dsputil_init(&s->dsp, avctx); + + s->first_frame = 1; + s->receiving_decoding_map = 1; /* decoding map will be received first */ + + /* decoding map contains 4 bits of information per 8x8 block */ + s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2); + s->decoding_map = av_malloc(s->decoding_map_size); + + return 0; +} + +static int ipvideo_decode_frame(AVCodecContext *avctx, + void *data, int *data_size, + uint8_t *buf, int buf_size) +{ + IpvideoContext *s = avctx->priv_data; + + if (s->receiving_decoding_map) { + /* receiving the decoding map on this iteration */ + s->receiving_decoding_map = 0; + + if (buf_size != s->decoding_map_size) + printf (" Interplay video: buf_size != decoding_map_size (%d != %d)\n", + buf_size, s->decoding_map_size); + else + memcpy(s->decoding_map, buf, buf_size); + + *data_size = 0; + *(AVFrame*)data = s->last_frame; + } else { + /* receiving the compressed video data on this iteration */ + s->receiving_decoding_map = 1; + s->buf = buf; + s->size = buf_size; + + if (avctx->get_buffer(avctx, &s->current_frame)) { + printf (" Interplay Video: get_buffer() failed\n"); + return -1; + } + +// ipvideo_decode_frame(s); +memset(s->current_frame.data[0], 0x80, s->current_frame.linesize[0] * avctx->height); +memset(s->current_frame.data[1], 0x80, s->current_frame.linesize[1] * avctx->height / 4); +memset(s->current_frame.data[2], 0x80, s->current_frame.linesize[2] * avctx->height / 4); + + /* release the last frame if it is allocated */ + if (s->first_frame) + s->first_frame = 0; + else + avctx->release_buffer(avctx, &s->last_frame); + + /* shuffle frames */ + s->last_frame = s->current_frame; + + *data_size = sizeof(AVFrame); + *(AVFrame*)data = s->current_frame; + } + + /* always report that the buffer was completely consumed */ + return buf_size; +} + +static int ipvideo_decode_end(AVCodecContext *avctx) +{ + IpvideoContext *s = avctx->priv_data; + + /* release the last frame */ + avctx->release_buffer(avctx, &s->last_frame); + + av_free(s->decoding_map); + + return 0; +} + +AVCodec interplay_video_decoder = { + "interplayvideo", + CODEC_TYPE_VIDEO, + CODEC_ID_INTERPLAY_VIDEO, + sizeof(IpvideoContext), + ipvideo_decode_init, + NULL, + ipvideo_decode_end, + ipvideo_decode_frame, + CODEC_CAP_DR1, +}; |