155 lines
4.5 KiB
C
155 lines
4.5 KiB
C
/*
|
|
* ZeroCodec Decoder
|
|
*
|
|
* Copyright (c) 2012, Derek Buitenhuis
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include <zlib.h>
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "libavutil/common.h"
|
|
|
|
typedef struct ZeroCodecContext {
|
|
AVFrame *previous_frame;
|
|
z_stream zstream;
|
|
} ZeroCodecContext;
|
|
|
|
static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
ZeroCodecContext *zc = avctx->priv_data;
|
|
AVFrame *pic = data;
|
|
AVFrame *prev_pic = zc->previous_frame;
|
|
z_stream *zstream = &zc->zstream;
|
|
uint8_t *prev = prev_pic->data[0];
|
|
uint8_t *dst;
|
|
int i, j, zret, ret;
|
|
|
|
if (avpkt->flags & AV_PKT_FLAG_KEY) {
|
|
pic->key_frame = 1;
|
|
pic->pict_type = AV_PICTURE_TYPE_I;
|
|
} else {
|
|
if (!prev) {
|
|
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
prev += (avctx->height - 1) * prev_pic->linesize[0];
|
|
|
|
pic->key_frame = 0;
|
|
pic->pict_type = AV_PICTURE_TYPE_P;
|
|
}
|
|
|
|
zret = inflateReset(zstream);
|
|
if (zret != Z_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (ff_get_buffer(avctx, pic, AV_GET_BUFFER_FLAG_REF) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
zstream->next_in = avpkt->data;
|
|
zstream->avail_in = avpkt->size;
|
|
|
|
dst = pic->data[0] + (avctx->height - 1) * pic->linesize[0];
|
|
|
|
/**
|
|
* ZeroCodec has very simple interframe compression. If a value
|
|
* is the same as the previous frame, set it to 0.
|
|
*/
|
|
|
|
for (i = 0; i < avctx->height; i++) {
|
|
zstream->next_out = dst;
|
|
zstream->avail_out = avctx->width << 1;
|
|
|
|
zret = inflate(zstream, Z_SYNC_FLUSH);
|
|
if (zret != Z_OK && zret != Z_STREAM_END) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Inflate failed with return code: %d.\n", zret);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (!(avpkt->flags & AV_PKT_FLAG_KEY))
|
|
for (j = 0; j < avctx->width << 1; j++)
|
|
dst[j] += prev[j] & -!dst[j];
|
|
|
|
prev -= prev_pic->linesize[0];
|
|
dst -= pic->linesize[0];
|
|
}
|
|
|
|
av_frame_unref(zc->previous_frame);
|
|
if ((ret = av_frame_ref(zc->previous_frame, pic)) < 0)
|
|
return ret;
|
|
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
|
|
{
|
|
ZeroCodecContext *zc = avctx->priv_data;
|
|
|
|
av_frame_free(&zc->previous_frame);
|
|
|
|
inflateEnd(&zc->zstream);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
|
|
{
|
|
ZeroCodecContext *zc = avctx->priv_data;
|
|
z_stream *zstream = &zc->zstream;
|
|
int zret;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_UYVY422;
|
|
avctx->bits_per_raw_sample = 8;
|
|
|
|
zstream->zalloc = Z_NULL;
|
|
zstream->zfree = Z_NULL;
|
|
zstream->opaque = Z_NULL;
|
|
|
|
zret = inflateInit(zstream);
|
|
if (zret != Z_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d.\n", zret);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
zc->previous_frame = av_frame_alloc();
|
|
if (!zc->previous_frame) {
|
|
zerocodec_decode_close(avctx);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_zerocodec_decoder = {
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.name = "zerocodec",
|
|
.long_name = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"),
|
|
.id = AV_CODEC_ID_ZEROCODEC,
|
|
.priv_data_size = sizeof(ZeroCodecContext),
|
|
.init = zerocodec_decode_init,
|
|
.decode = zerocodec_decode_frame,
|
|
.close = zerocodec_decode_close,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|