mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
324 lines
9.6 KiB
C
324 lines
9.6 KiB
C
/*
|
|
* NuppelVideo decoder
|
|
* Copyright (c) 2006 Reimar Doeffinger
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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 "libavutil/bswap.h"
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/lzo.h"
|
|
#include "libavutil/imgutils.h"
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "rtjpeg.h"
|
|
|
|
typedef struct {
|
|
AVFrame pic;
|
|
int codec_frameheader;
|
|
int quality;
|
|
int width, height;
|
|
unsigned int decomp_size;
|
|
unsigned char *decomp_buf;
|
|
uint32_t lq[64], cq[64];
|
|
RTJpegContext rtj;
|
|
DSPContext dsp;
|
|
} NuvContext;
|
|
|
|
static const uint8_t fallback_lquant[] = {
|
|
16, 11, 10, 16, 24, 40, 51, 61,
|
|
12, 12, 14, 19, 26, 58, 60, 55,
|
|
14, 13, 16, 24, 40, 57, 69, 56,
|
|
14, 17, 22, 29, 51, 87, 80, 62,
|
|
18, 22, 37, 56, 68, 109, 103, 77,
|
|
24, 35, 55, 64, 81, 104, 113, 92,
|
|
49, 64, 78, 87, 103, 121, 120, 101,
|
|
72, 92, 95, 98, 112, 100, 103, 99
|
|
};
|
|
|
|
static const uint8_t fallback_cquant[] = {
|
|
17, 18, 24, 47, 99, 99, 99, 99,
|
|
18, 21, 26, 66, 99, 99, 99, 99,
|
|
24, 26, 56, 99, 99, 99, 99, 99,
|
|
47, 66, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99
|
|
};
|
|
|
|
/**
|
|
* @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, const uint8_t *src, int width, int height)
|
|
{
|
|
AVPicture pic;
|
|
avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
|
|
av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
|
|
}
|
|
|
|
/**
|
|
* @brief extract quantization tables from codec data into our context
|
|
*/
|
|
static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
|
|
int size)
|
|
{
|
|
int i;
|
|
if (size < 2 * 64 * 4) {
|
|
av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* @brief set quantization tables from a quality value
|
|
*/
|
|
static void get_quant_quality(NuvContext *c, int quality)
|
|
{
|
|
int i;
|
|
quality = FFMAX(quality, 1);
|
|
for (i = 0; i < 64; i++) {
|
|
c->lq[i] = (fallback_lquant[i] << 7) / quality;
|
|
c->cq[i] = (fallback_cquant[i] << 7) / quality;
|
|
}
|
|
}
|
|
|
|
static int codec_reinit(AVCodecContext *avctx, int width, int height,
|
|
int quality)
|
|
{
|
|
NuvContext *c = avctx->priv_data;
|
|
int ret;
|
|
|
|
width = FFALIGN(width, 2);
|
|
height = FFALIGN(height, 2);
|
|
if (quality >= 0)
|
|
get_quant_quality(c, quality);
|
|
if (width != c->width || height != c->height) {
|
|
if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
|
|
return ret;
|
|
avctx->width = c->width = width;
|
|
avctx->height = c->height = height;
|
|
av_fast_malloc(&c->decomp_buf, &c->decomp_size,
|
|
c->height * c->width * 3 / 2);
|
|
if (!c->decomp_buf) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Can't allocate decompression buffer.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
|
|
c->lq, c->cq);
|
|
} else if (quality != c->quality)
|
|
ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
|
|
c->lq, c->cq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
NuvContext *c = avctx->priv_data;
|
|
AVFrame *picture = data;
|
|
int orig_size = buf_size;
|
|
int keyframe;
|
|
int result, init_frame = !avctx->frame_number;
|
|
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 AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
// 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;
|
|
ff_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 AVERROR_INVALIDDATA;
|
|
}
|
|
comptype = buf[1];
|
|
switch (comptype) {
|
|
case NUV_RTJPEG_IN_LZO:
|
|
case NUV_RTJPEG:
|
|
keyframe = !buf[2];
|
|
break;
|
|
case NUV_COPY_LAST:
|
|
keyframe = 0;
|
|
break;
|
|
default:
|
|
keyframe = 1;
|
|
break;
|
|
}
|
|
// skip rest of the frameheader.
|
|
buf = &buf[12];
|
|
buf_size -= 12;
|
|
if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
|
|
int outlen = c->decomp_size, inlen = buf_size;
|
|
if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
|
|
av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
|
|
buf = c->decomp_buf;
|
|
buf_size = c->decomp_size;
|
|
}
|
|
if (c->codec_frameheader) {
|
|
int w, h, q;
|
|
if (buf_size < RTJPEG_HEADER_SIZE || buf[4] != RTJPEG_HEADER_SIZE ||
|
|
buf[5] != RTJPEG_FILE_VERSION) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
w = AV_RL16(&buf[6]);
|
|
h = AV_RL16(&buf[8]);
|
|
q = buf[10];
|
|
if ((result = codec_reinit(avctx, w, h, q)) < 0)
|
|
return result;
|
|
buf = &buf[RTJPEG_HEADER_SIZE];
|
|
buf_size -= RTJPEG_HEADER_SIZE;
|
|
}
|
|
|
|
if (keyframe) {
|
|
av_frame_unref(&c->pic);
|
|
init_frame = 1;
|
|
}
|
|
|
|
result = ff_reget_buffer(avctx, &c->pic);
|
|
if (result < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return result;
|
|
}
|
|
if (init_frame) {
|
|
memset(c->pic.data[0], 0, avctx->height * c->pic.linesize[0]);
|
|
memset(c->pic.data[1], 0x80, avctx->height * c->pic.linesize[1] / 2);
|
|
memset(c->pic.data[2], 0x80, avctx->height * c->pic.linesize[2] / 2);
|
|
}
|
|
|
|
c->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
|
|
c->pic.key_frame = keyframe;
|
|
// decompress/copy/whatever data
|
|
switch (comptype) {
|
|
case NUV_LZO:
|
|
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_IN_LZO:
|
|
case NUV_RTJPEG:
|
|
ff_rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
|
|
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:
|
|
/* nothing more to do here */
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if ((result = av_frame_ref(picture, &c->pic)) < 0)
|
|
return result;
|
|
|
|
*got_frame = 1;
|
|
return orig_size;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
NuvContext *c = avctx->priv_data;
|
|
int ret;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
|
|
c->pic.data[0] = NULL;
|
|
c->decomp_buf = NULL;
|
|
c->quality = -1;
|
|
c->width = 0;
|
|
c->height = 0;
|
|
|
|
c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
|
|
|
|
if (avctx->extradata_size)
|
|
get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
|
|
|
|
ff_dsputil_init(&c->dsp, avctx);
|
|
|
|
if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
NuvContext *c = avctx->priv_data;
|
|
|
|
av_freep(&c->decomp_buf);
|
|
av_frame_unref(&c->pic);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_nuv_decoder = {
|
|
.name = "nuv",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_NUV,
|
|
.priv_data_size = sizeof(NuvContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.decode = decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
|
|
};
|