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/*
* NuppelVideo decoder
* Copyright (c) 2006 Reimar Doeffinger
*
* 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 <stdio.h>
#include <stdlib.h>
#include "common.h"
#include "avcodec.h"
#include "bswap.h"
#include "dsputil.h"
#include "lzo.h"
#include "rtjpeg.h"
typedef struct {
AVFrame pic;
int width, height;
unsigned int decomp_size;
unsigned char* decomp_buf;
uint32_t lq[64], cq[64];
RTJpegContext rtj;
DSPContext dsp;
} NuvContext;
/**
* \brief copy frame data from buffer to AVFrame, handling stride.
* \param f destination AVFrame
* \param src source buffer, does not use any line-stride
* \param width width of the video frame
* \param height height of the video frame
*/
static void copy_frame(AVFrame *f, uint8_t *src,
int width, int height) {
AVPicture pic;
avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height);
img_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height);
}
/**
* \brief extract quantization tables from codec data into our context
*/
static int get_quant(AVCodecContext *avctx, NuvContext *c,
uint8_t *buf, int size) {
int i;
if (size < 2 * 64 * 4) {
av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
return -1;
}
for (i = 0; i < 64; i++, buf += 4)
c->lq[i] = AV_RL32(buf);
for (i = 0; i < 64; i++, buf += 4)
c->cq[i] = AV_RL32(buf);
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
uint8_t *buf, int buf_size) {
NuvContext *c = (NuvContext *)avctx->priv_data;
AVFrame *picture = data;
int orig_size = buf_size;
enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
if (buf_size < 12) {
av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
return -1;
}
if (c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
c->pic.reference = 1;
c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
if (avctx->get_buffer(avctx, &c->pic) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
// codec data (rtjpeg quant tables)
if (buf[0] == 'D' && buf[1] == 'R') {
int ret;
// skip rest of the frameheader.
buf = &buf[12];
buf_size -= 12;
ret = get_quant(avctx, c, buf, buf_size);
if (ret < 0)
return ret;
rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
return orig_size;
}
if (buf[0] != 'V' || buf_size < 12) {
av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
return -1;
}
comptype = buf[1];
// skip rest of the frameheader.
buf = &buf[12];
buf_size -= 12;
c->pic.pict_type = FF_I_TYPE;
c->pic.key_frame = 1;
// decompress/copy/whatever data
switch (comptype) {
case NUV_UNCOMPRESSED: {
int height = c->height;
if (buf_size < c->width * height * 3 / 2) {
av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
height = buf_size / c->width / 3 * 2;
}
copy_frame(&c->pic, buf, c->width, height);
break;
}
case NUV_RTJPEG: {
rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
break;
}
case NUV_RTJPEG_IN_LZO: {
int outlen = c->decomp_size, inlen = buf_size;
if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, c->decomp_buf, c->decomp_size);
break;
}
case NUV_LZO: {
int outlen = c->decomp_size, inlen = buf_size;
if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
copy_frame(&c->pic, c->decomp_buf, c->width, c->height);
break;
}
case NUV_BLACK: {
memset(c->pic.data[0], 0, c->width * c->height);
memset(c->pic.data[1], 128, c->width * c->height / 4);
memset(c->pic.data[2], 128, c->width * c->height / 4);
break;
}
case NUV_COPY_LAST: {
c->pic.pict_type = FF_P_TYPE;
c->pic.key_frame = 0;
/* nothing more to do here */
break;
}
default:
av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
return -1;
}
*picture = c->pic;
*data_size = sizeof(AVFrame);
return orig_size;
}
static int decode_init(AVCodecContext *avctx) {
NuvContext *c = (NuvContext *)avctx->priv_data;
avctx->width = (avctx->width + 1) & ~1;
avctx->height = (avctx->height + 1) & ~1;
if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
return 1;
}
avctx->has_b_frames = 0;
avctx->pix_fmt = PIX_FMT_YUV420P;
c->pic.data[0] = NULL;
c->width = avctx->width;
c->height = avctx->height;
c->decomp_size = c->height * c->width * 3 / 2;
c->decomp_buf = av_malloc(c->decomp_size + LZO_OUTPUT_PADDING);
if (!c->decomp_buf) {
av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
return 1;
}
dsputil_init(&c->dsp, avctx);
if (avctx->extradata_size)
get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
return 0;
}
static int decode_end(AVCodecContext *avctx) {
NuvContext *c = (NuvContext *)avctx->priv_data;
av_freep(&c->decomp_buf);
if (c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
return 0;
}
AVCodec nuv_decoder = {
"nuv",
CODEC_TYPE_VIDEO,
CODEC_ID_NUV,
sizeof(NuvContext),
decode_init,
NULL,
decode_end,
decode_frame,
CODEC_CAP_DR1,
};
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