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Avc.cpp
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Avc.cpp
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#include <stdio.h>
#include <stdlib.h>
#include <SDL/SDL.h>
#include "Avc.h"
#define WIDTH 640
#define HEIGHT 480
#define BPP 4
#define DEPTH 32
char *readFile(const char* filename, int *size) {
FILE *file = fopen(filename, "rb");
if (!file) {
fprintf(stderr, "Unable to open file %s\n", filename);
return NULL;
}
fseek(file, 0, SEEK_END);
unsigned long bufferSize = ftell(file) + 1;
fseek(file, 0, SEEK_SET);
char *buffer = (char *) malloc(bufferSize);
if (!buffer) {
fprintf(stderr, "Memory error!\n");
fclose(file);
return NULL;
}
fread((char *) buffer, bufferSize, 1, file);
fclose(file);
*size = (int) bufferSize;
return buffer;
}
uintptr_t my_malloc(void *userData, int32 size, int attribute) {
return (uintptr_t) malloc(size);
}
void my_free(void *userData, uintptr_t mem) {
free((void *) mem);
}
Avc::Avc(const char *filename) {
decoder.AVCObject = NULL;
decoder.CBAVC_Malloc = my_malloc;
decoder.CBAVC_Free = my_free;
decoder.debugEnable = true;
buffer = (uint8*) readFile(filename, &buffer_size);
screen = NULL;
}
int
Avc::pollKeyPress() {
SDL_Event event;
int keypress = 0;
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_QUIT:
keypress = 1;
break;
case SDL_KEYDOWN:
keypress = 1;
break;
}
}
return keypress;
}
int Avc::Play() {
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
return 1;
}
// if (!(screen = SDL_SetVideoMode(WIDTH, HEIGHT, DEPTH, SDL_HWSURFACE))) {
// SDL_Quit();
// return 1;
// }
uint8 *nal_unit = NULL;
stream = buffer;
int nal_size = buffer_size;
int nal_number = 0;
while (true) {
if (PVAVCAnnexBGetNALUnit(stream, &nal_unit, &nal_size) != AVCDEC_SUCCESS) {
printf("PVAVCAnnexBGetNALUnit Failed\n");
PVAVCCleanUpDecoder(&decoder);
break;
}
trace("+ NAL Unit %d\n", nal_number++);
trace("| nal_size: %d\n", nal_size);
if (decodeNALUnit(nal_unit, nal_size) == 0) {
break;
}
// SDL_Delay(1000 / 50);
stream = nal_unit + nal_size;
nal_size = buffer_size - (stream - buffer);
if (pollKeyPress()) {
break;
}
// SDL_Delay(1000 / 50);
}
SDL_Quit();
return 0;
}
int
Avc::decodeNALUnit(uint8 *nal_unit, int nal_size) {
int nal_type = 0;
int nal_ref_idc = 0;
PVAVCDecGetNALType(nal_unit, nal_size, &nal_type, &nal_ref_idc);
trace("| nal_type: %d\n", nal_type);
trace("| nal_ref_idc: %d\n", nal_ref_idc);
if (nal_type == AVC_NALTYPE_SPS) {
PVAVCDecSeqParamSet(&decoder, nal_unit, nal_size);
} else if (nal_type == AVC_NALTYPE_PPS) {
PVAVCDecPicParamSet(&decoder, nal_unit, nal_size);
} else if (nal_type == AVC_NALTYPE_SLICE || nal_type == AVC_NALTYPE_IDR) {
if (1) {
int ret = PVAVCDecodeSlice(&decoder, nal_unit, nal_size);
int indx;
int release;
AVCFrameIO output;
PVAVCDecGetOutput(&decoder, &indx, &release, &output);
if (!screen) {
screen = SDL_SetVideoMode(output.pitch, output.height, 32, SDL_HWSURFACE | SDL_RESIZABLE);
}
if (0) {
SDL_LockSurface(screen);
uint8 *luma = output.YCbCr[0];
uint8 *cb = output.YCbCr[1];
uint8 *cr = output.YCbCr[2];
uint32 *dst = (uint32*) screen->pixels;
int stride = output.pitch;
int strideChroma = output.pitch >> 1;
for (int y = 0; y < output.height; y++) {
int lineOffLuma = y * stride;
int lineOffChroma = (y >> 1) * strideChroma;
for (int x = 0; x < output.pitch; x++) {
int c = luma[lineOffLuma + x] - 16;
int d = cb[lineOffChroma + (x >> 1)] - 128;
int e = cr[lineOffChroma + (x >> 1)] - 128;
int red = (298 * c + 409 * e + 128) >> 8;
red = red < 0 ? 0 : (red > 255 ? 255 : red);
int green = (298 * c - 100 * d - 208 * e + 128) >> 8;
green = green < 0 ? 0 : (green > 255 ? 255 : green);
int blue = (298 * c + 516 * d + 128) >> 8;
blue = blue < 0 ? 0 : (blue > 255 ? 255 : blue);
int alpha = 255;
dst[lineOffLuma + x] = SDL_MapRGB(screen->format, red & 0xff, green & 0xff, blue & 0xff);
}
}
SDL_UnlockSurface(screen);
SDL_Flip(screen);
}
}
} else {
printf("Missed %d\n", nal_type);
}
return 1;
}