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First ugly and slow attempt to fix nuv files with extra frameheader

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and per-frame rtjpeg quality

Originally committed as revision 10441 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2007-09-09 08:42:49 +00:00
parent c612b00d7e
commit 4f8a91c961
1 changed files with 41 additions and 0 deletions
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41
libavcodec/nuv.c
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@ -30,6 +30,7 @@
typedef struct {
AVFrame pic;
int codec_frameheader;
int width, height;
unsigned int decomp_size;
unsigned char* decomp_buf;
@ -38,6 +39,28 @@ typedef struct {
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
@ -69,6 +92,17 @@ static int get_quant(AVCodecContext *avctx, NuvContext *c,
return 0;
}
/**
* \brief set quantization tables from a quality value
*/
static void get_quant_quality(NuvContext *c, int quality) {
int i;
for (i = 0; i < 64; i++) {
c->lq[i] = (fallback_lquant[i] << 7) / quality;
c->cq[i] = (fallback_cquant[i] << 7) / quality;
}
}
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
uint8_t *buf, int buf_size) {
NuvContext *c = avctx->priv_data;
@ -121,6 +155,12 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
buf = c->decomp_buf;
buf_size = c->decomp_size;
}
if (c->codec_frameheader) {
get_quant_quality(c, buf[10]);
rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
buf = &buf[12];
buf_size -= 12;
}
c->pic.pict_type = FF_I_TYPE;
c->pic.key_frame = 1;
@ -172,6 +212,7 @@ static int decode_init(AVCodecContext *avctx) {
}
avctx->pix_fmt = PIX_FMT_YUV420P;
c->pic.data[0] = NULL;
c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
c->width = avctx->width;
c->height = avctx->height;
c->decomp_size = c->height * c->width * 3 / 2;