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FFmpeg/libavcodec/nuv.c
Reimar Döffinger 98b0120668 nuv: Fix playback of RTjpeg from current MythTV, 
The previous validity check seems to work only for some
(presumably older) files, in current versions the first bytes
now contain the data size.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
2012-08-01 19:35:58 +02:00

307 lines
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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/lzo.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "dsputil.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, PIX_FMT_YUV420P, width, height);
av_picture_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,
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 -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;
}
/**
* @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;
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
int buf_size = 24 + height * width * 3 / 2 + AV_LZO_OUTPUT_PADDING;
if (av_image_check_size(height, width, 0, avctx) < 0 ||
buf_size > INT_MAX/8)
return -1;
avctx->width = c->width = width;
avctx->height = 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->dsp, c->width, c->height, c->lq, c->cq);
return 1;
} 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 *data_size,
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 size_change = 0;
int result;
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;
}
// 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_size < 12 || buf[0] != 'V') {
av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
return -1;
}
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;
}
retry:
// 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 - AV_LZO_OUTPUT_PADDING, 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 - AV_LZO_OUTPUT_PADDING - outlen;
}
if (c->codec_frameheader) {
int w, h, q, res;
if (buf_size < 12) {
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];
res = codec_reinit(avctx, w, h, q);
if (res < 0)
return res;
if (res) {
buf = avpkt->data;
buf_size = avpkt->size;
size_change = 1;
goto retry;
}
buf = &buf[12];
buf_size -= 12;
}
if ((size_change || keyframe) && c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
c->pic.reference = 3;
c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
result = avctx->reget_buffer(avctx, &c->pic);
if (result < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
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 -1;
}
*picture = c->pic;
*data_size = sizeof(AVFrame);
return orig_size;
}
static av_cold int decode_init(AVCodecContext *avctx) {
NuvContext *c = avctx->priv_data;
avctx->pix_fmt = 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 (codec_reinit(avctx, avctx->width, avctx->height, -1) < 0)
return 1;
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx) {
NuvContext *c = avctx->priv_data;
av_freep(&c->decomp_buf);
if (c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
return 0;
}
AVCodec ff_nuv_decoder = {
.name = "nuv",
.type = AVMEDIA_TYPE_VIDEO,
.id = 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"),
};
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