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FFmpeg/libavcodec/nuv.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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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 <limits.h>
#include "libavutil/bswap.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/lzo.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "idctdsp.h"
#include "internal.h"
#include "rtjpeg.h"
typedef struct NuvContext {
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;
} 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)
{
uint8_t *src_data[4];
int src_linesize[4];
av_image_fill_arrays(src_data, src_linesize, src,
f->format, width, height, 1);
av_image_copy(f->data, f->linesize, (const uint8_t **)src_data, src_linesize,
f->format, 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) {
// also reserve space for a possible additional header
int64_t buf_size = height * (int64_t)width * 3 / 2
+ FFMAX(AV_LZO_OUTPUT_PADDING, AV_INPUT_BUFFER_PADDING_SIZE)
+ RTJPEG_HEADER_SIZE;
if (buf_size > INT_MAX/8)
return -1;
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
return ret;
c->width = width;
c->height = height;
av_fast_malloc(&c->decomp_buf, &c->decomp_size,
buf_size);
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->width, c->height, c->lq, c->cq);
av_frame_unref(c->pic);
return 1;
} else if (quality != c->quality)
ff_rtjpeg_decode_init(&c->rtj, 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, ret;
int size_change = 0;
int minsize = 0;
int flags = 0;
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 the rest of the frame header.
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->width, c->height, c->lq, c->cq);
return orig_size;
}
if (buf_size < 12 || buf[0] != 'V') {
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];
if (c->width < 16 || c->height < 16) {
return AVERROR_INVALIDDATA;
}
break;
case NUV_COPY_LAST:
flags |= FF_REGET_BUFFER_FLAG_READONLY;
keyframe = 0;
break;
default:
keyframe = 1;
break;
}
switch (comptype) {
case NUV_UNCOMPRESSED:
minsize = c->width * c->height * 3 / 2;
break;
case NUV_RTJPEG:
minsize = c->width/16 * (c->height/16) * 6;
break;
case NUV_BLACK:
case NUV_COPY_LAST:
case NUV_LZO:
case NUV_RTJPEG_IN_LZO:
break;
default:
av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
return AVERROR_INVALIDDATA;
}
if (buf_size < minsize / 4)
return AVERROR_INVALIDDATA;
retry:
// Skip the rest of the frame header.
buf = &buf[12];
buf_size -= 12;
if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
int outlen = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
int inlen = buf_size;
if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
return AVERROR_INVALIDDATA;
}
buf = c->decomp_buf;
buf_size = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
memset(c->decomp_buf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
}
if (c->codec_frameheader) {
int w, h, q;
if (buf_size < RTJPEG_HEADER_SIZE) {
av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
return AVERROR_INVALIDDATA;
}
// There seem to exist two variants of this header: one starts with 'V'
// and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
// 1 byte header size (== 12), 1 byte version (== 0)
if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\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;
if (result) {
buf = avpkt->data;
buf_size = avpkt->size;
size_change = 1;
goto retry;
}
buf = &buf[RTJPEG_HEADER_SIZE];
buf_size -= RTJPEG_HEADER_SIZE;
}
if (size_change || keyframe) {
av_frame_unref(c->pic);
init_frame = 1;
}
if ((result = ff_reget_buffer(avctx, c->pic, flags)) < 0)
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;
}
if(height > 0)
copy_frame(c->pic, buf, c->width, height);
break;
}
case NUV_RTJPEG_IN_LZO:
case NUV_RTJPEG:
ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
if (ret < 0)
return ret;
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;
}
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;
c->pic = av_frame_alloc();
if (!c->pic)
return AVERROR(ENOMEM);
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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_rtjpeg_init(&c->rtj, 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_free(&c->pic);
return 0;
}
const FFCodec ff_nuv_decoder = {
.p.name = "nuv",
.p.long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_NUV,
.priv_data_size = sizeof(NuvContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};
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