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/*
* Copyright (C) 2005 Rik Snel <rsnel@cube.dyndns.org>, license GPL v2 or later
* - based on vd_mpegpes.c by A'rpi (C) 2002-2003
* - guess_mjpeg_type code stolen from lav_io.c (C) 2000 Rainer Johanni
* <Rainer@Johanni.de> from the mjpegtools package
*/
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include "mp_msg.h"
#include "vfcap.h"
/* some convenient #define's, is this portable enough? */
#define VERBOSE(...) mp_msg(MSGT_DECVIDEO, MSGL_V, "vd_zrmjpeg: " __VA_ARGS__)
#define ERROR(...) mp_msg(MSGT_DECVIDEO, MSGL_ERR, "vd_zrmjpeg: " __VA_ARGS__)
#define WARNING(...) mp_msg(MSGT_DECVIDEO, MSGL_WARN, \
"vd_zrmjpeg: " __VA_ARGS__)
#include "vd_internal.h"
static const vd_info_t info =
{
"Zoran MJPEG Video passthrough",
"zrmjpeg",
"Rik Snel <snel@phys.uu.nl>",
"Rik Snel <snel@phys.uu.nl>",
"for hw decoders (DC10(+)/buz/lml33)"
};
LIBVD_EXTERN(zrmjpeg)
#include "libvo/video_out.h"
typedef struct {
int vo_initialized;
unsigned int preferred_csp;
} vd_zrmjpeg_ctx_t;
static int query_format(sh_video_t *sh, unsigned int format) {
vd_zrmjpeg_ctx_t *ctx = sh->context;
if (format == ctx->preferred_csp) return VFCAP_CSP_SUPPORTED;
return CONTROL_FALSE;
}
// to set/get/query special features/parameters
static int control(sh_video_t *sh, int cmd, void* arg, ...) {
switch (cmd) {
case VDCTRL_QUERY_FORMAT:
return query_format(sh, *((unsigned int*)arg));
}
return CONTROL_UNKNOWN;
}
// init driver
static int init(sh_video_t *sh) {
vd_zrmjpeg_ctx_t *ctx;
VERBOSE("init called\n");
ctx = malloc(sizeof(*ctx));
if (!ctx) return 0;
memset(ctx, 0, sizeof(*ctx));
sh->context = ctx;
/* defer init of vo until the first frame is known */
return 1;
#if 0
return mpcodecs_config_vo(sh, sh->disp_w, sh->disp_h, IMGFMT_ZRMJPEGIT);
#endif
}
// uninit driver
static void uninit(sh_video_t *sh) {
free(sh->context);
}
/* parts directly stolen from scan_jpg() and lav_open_input_file */
static int get_int2(unsigned char *buf) {
return buf[0]*256 + buf[1];
}
#define M_SOF0 0xC0
#define M_SOF1 0xC1
#define M_DHT 0xC4
#define M_SOI 0xD8 /* Start Of Image (beginning of datastream) */
#define M_EOI 0xD9 /* End Of Image (end of datastream) */
#define M_SOS 0xDA /* Start Of Scan (begins compressed data) */
#define M_DQT 0xDB
#define M_APP0 0xE0
#define M_APP1 0xE1
/* returns 0 in case of failure */
static unsigned int guess_mjpeg_type(unsigned char *data, unsigned int size,
int d_height) {
unsigned int p;
int marker, length, height, ncomps, i, hf[3], vf[3];
unsigned int app0 = 0, header = 0;
/* The initial marker must be SIO */
if (size < 2) {
ERROR("JPEG data too short (%d bytes)\n", size);
return 0;
}
if (data[0] != 0xFF || data[1] != M_SOI) {
ERROR("JPEG data must start with FFD8, but doesn't\n");
return 0;
}
p = 2; /* pointer within jpeg data */
while (p < size) {
/* search 0xFF */
while(data[p] != 0xFF) {
p++;
if (p >= size) return 0;
}
/* get marker code, skip duplicate FF's */
while(data[p] == 0xFF) {
p++;
if (p >= size) return 0;
}
marker = data[p++];
/* marker may have an associated length */
if (p <= size - 2) length = get_int2(data+p);
else length = 0;
switch (marker) {
case M_SOF0:
case M_SOF1:
header = p-2;
VERBOSE("found offset of header %u\n",
header);
break;
case M_SOS:
size = 0;
continue;
case M_APP0:
app0 = p-2;
VERBOSE("found offset of APP0 %u\n",
app0);
break;
}
/* these markers shouldn't have parameters,
* i.e. we don't need to skip anaything */
if (marker == 0 || marker == 1 ||
(marker >= 0xd0 && marker < 0xd8))
continue;
if (p + length <= size) p += length;
else {
ERROR("input JPEG too short, data missing\n");
return 0;
}
}
if (!header) {
ERROR("JPEG header (with resolution and sampling factors) not found\n");
return 0;
}
if (data[header + 9] != 3) {
ERROR("JPEG has wrong number of components\n");
return 0;
}
/* get the horizontal and vertical sample factors */
for (i = 0; i < 3; i++) {
hf[i] = data[header + 10 + 3*i + 1]>>4;
vf[i] = data[header + 10 + 3*i + 1]&0x0F;
}
if (hf[0] != 2 || hf[1] != 1 || hf[2] != 1 ||
vf[0] != 1 || vf[1] != 1 || vf[2] != 1) {
ERROR("JPEG has wrong internal image format\n");
} else VERBOSE("JPEG has colorspace YUV422 with minimal sampling factors (good)\n");
height = get_int2(data + header + 5);
if (height == d_height) {
VERBOSE("data is non interlaced\n");
return IMGFMT_ZRMJPEGNI;
}
if (2*height != d_height) {
ERROR("something very inconsistent happened\n");
return 0;
}
if (app0 && get_int2(data + app0 + 2) >= 5 &&
strncasecmp((char*)(data + app0 + 4), "AVI1", 4) == 0) {
if (data[app0+8] == 1) {
VERBOSE("data is interlaced, APP0: top-first (1)\n");
return IMGFMT_ZRMJPEGIT;
} else {
VERBOSE("data is interlaced, APP0: bottom-first (%d)\n",
data[app0+8]);
return IMGFMT_ZRMJPEGIB;
}
} else {
VERBOSE("data is interlaced, no (valid) APP0 marker, "
"guessing top-first\n");
return IMGFMT_ZRMJPEGIT;
}
return 0;
}
// decode a frame
static mp_image_t* decode(sh_video_t *sh, void* data, int len, int flags) {
mp_image_t* mpi;
vd_zrmjpeg_ctx_t *ctx = sh->context;
if (!ctx->vo_initialized) {
ctx->preferred_csp = guess_mjpeg_type(data, len, sh->disp_h);
if (ctx->preferred_csp == 0) return NULL;
mpcodecs_config_vo(sh, sh->disp_w, sh->disp_h,
ctx->preferred_csp);
ctx->vo_initialized = 1;
}
mpi = mpcodecs_get_image(sh, MP_IMGTYPE_EXPORT, 0,
sh->disp_w, sh->disp_h);
/* abuse of mpi */
mpi->planes[0]=(uint8_t*)data;
mpi->planes[1]=(uint8_t*)len;
return mpi;
}
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