JNIEXPORT void Java_com_dropcam_android_media_H264Decoder_nativeInit(JNIEnv* env, jobject thiz, jint color_format) {
DecoderContext *ctx = calloc(1, sizeof(DecoderContext));
D("Creating native H264 decoder context");
switch (color_format) {
case COLOR_FORMAT_YUV420:
ctx->color_format = PIX_FMT_YUV420P;
break;
case COLOR_FORMAT_RGB565LE:
ctx->color_format = PIX_FMT_RGB565LE;
break;
case COLOR_FORMAT_BGR32:
ctx->color_format = PIX_FMT_BGR32;
break;
}
ctx->codec = avcodec_find_decoder(CODEC_ID_H264);
ctx->codec_ctx = avcodec_alloc_context3(ctx->codec);
ctx->codec_ctx->pix_fmt = PIX_FMT_YUV420P;
ctx->codec_ctx->flags2 |= CODEC_FLAG2_CHUNKS;
ctx->src_frame = av_frame_alloc();
ctx->dst_frame = av_frame_alloc();
avcodec_open2(ctx->codec_ctx, ctx->codec, NULL);
set_ctx(env, thiz, ctx);
}
int hdd_io(int hdd_n, void *buff, u16 sectors, u64 start, int read)
{
u8 sbuf[32];
rm_ctx ctx;
u32 head, cyl;
u8 dos_n = hdd2dos(hdd_n);
hdd_inf *hdd = &iodb.p_hdd[hdd_n];
lba_p *lba = pv(0x580); /* this needed for avoid stupid actions by buggy BIOSes */
int succs = 0;
/* setup initial context */
set_ctx(0, &ctx);
if (hdd->flags & HDD_LBA)
{
/* save old buffer */
mincpy(sbuf, lba, sizeof(sbuf));
/* setup LBA block */
lba->size = sizeof(lba_p);
lba->unk = 0;
lba->dst_sel = rm_seg(buff);
lba->dst_off = rm_off(buff);
lba->numb = sectors;
lba->sector = start;
ctx.ah = read ? 0x42:0x43;
ctx.dl = dos_n;
ctx.si = 0x180;
ctx.ds = 0x40; /* if DS can be 0x40, we can avoid AWARD BIOS bug of int13/AX=4B01 */
/* set additional registers to serve buggy BIOSes. */
ctx.es = ctx.ds;
ctx.di = ctx.si;
ctx.bx = ctx.si;
ctx.cx = ctx.ds;
/* do not check AH because some buggy USB BIOSes fail to clear AH on success */
succs = bios_call(0x13, &ctx);
/* restore saved buffer */
mincpy(lba, sbuf, sizeof(sbuf));
} else
{
head = d32(start) / hdd->max_sect;
cyl = head / hdd->max_head;
ctx.ah = read ? 0x02:0x03;
ctx.al = d8(sectors);
ctx.ch = d8(cyl);
ctx.cl = d8(((cyl & 0x0300) >> 2) | (d32(start) % hdd->max_sect + 1));
ctx.dh = head % hdd->max_head;
ctx.dl = dos_n;
ctx.es = rm_seg(buff);
ctx.bx = rm_off(buff);
/* do not check AH because some buggy USB BIOSes fail to clear AH on success */
succs = bios_call(0x13, &ctx);
}
return succs;
}
