iec61883input.C

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#include "condition.h"
#include "iec61883input.h"
#include "mutex.h"
#include "vframe.h"

#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define INPUT_SAMPLES 131072
#define BUFFER_TIMEOUT 500000


IEC61883Input::IEC61883Input()
 : Thread(1, 1, 0)
{
        frame = 0;
        handle = 0;
        fd = 0;
        buffer = 0;
        buffer_valid = 0;
        input_buffer = 0;
        done = 0;
        total_buffers = 0;
        current_inbuffer = 0;
        current_outbuffer = 0;
        buffer_size = 0;
        audio_buffer = 0;
        audio_samples = 0;
        video_lock = 0;
        audio_lock = 0;
        buffer_lock = 0;
        decoder = 0;
}

IEC61883Input::~IEC61883Input()
{
// Driver crashes if it isn't stopped before cancelling the thread.
// May still crash during the cancel though.

        if(Thread::running())
        {
                done = 1;
                Thread::join();
        }

        if(buffer)
        {
                for(int i = 0; i < total_buffers; i++)
                        delete [] buffer[i];
                delete [] buffer;
                delete [] buffer_valid;
        }

        if(input_buffer)
                munmap(input_buffer, total_buffers * buffer_size);

        if(audio_buffer)
        {
                delete [] audio_buffer;
        }

        if(decoder)
        {
                dv_delete(decoder);
        }

        if(video_lock) delete video_lock;
        if(audio_lock) delete audio_lock;
        if(buffer_lock) delete buffer_lock;
        if(frame) iec61883_dv_fb_close(frame);
        if(handle) raw1394_destroy_handle(handle);
}

static int write_frame_static(unsigned char *data, int len, int complete, void *ptr)
{
        IEC61883Input *input = (IEC61883Input*)ptr;
        return input->write_frame(data, len, complete);
}



int IEC61883Input::open(int port,
        int channel,
        int length,
        int channels,
        int samplerate,
        int bits,
        int w,
        int h)
{
        this->port = port;
        this->channel = channel;
        this->length = length;
        this->channels = channels;
        this->samplerate = samplerate;
        this->bits = bits;
        this->w = w;
        this->h = h;
        is_pal = (h == 576);
        buffer_size = is_pal ? DV_PAL_SIZE : DV_NTSC_SIZE;
        total_buffers = length;


// Initialize grabbing
        if(!handle)
        {
                handle = raw1394_new_handle_on_port(port);
                if(handle)
                {
                        frame = iec61883_dv_fb_init(handle, write_frame_static, (void *)this);
                        if(frame)
                        {
                                if(!iec61883_dv_fb_start(frame, channel))
                                {
                                        fd = raw1394_get_fd(handle);
                                }
                        }
                }

                buffer = new char*[total_buffers];
                buffer_valid = new int[total_buffers];
                bzero(buffer_valid, sizeof(int) * total_buffers);
                for(int i = 0; i < total_buffers; i++)
                {
                        buffer[i] = new char[DV_PAL_SIZE];
                }


                audio_buffer = new char[INPUT_SAMPLES * 2 * channels];

                audio_lock = new Condition(0, "IEC61883Input::audio_lock");
                video_lock = new Condition(0, "IEC61883Input::video_lock");
                buffer_lock = new Mutex("IEC61883Input::buffer_lock");

                decoder = dv_new();

                Thread::start();
        }

        if(!handle || !frame || !fd) return 1;

        return 0;
}


void IEC61883Input::run()
{
        while(!done && handle)
        {
                struct timeval tv;
                fd_set rfds;
                FD_ZERO(&rfds);
                FD_SET(fd, &rfds);
                tv.tv_sec = 0;
                tv.tv_usec = 20000;
                if(select(fd + 1, &rfds, 0, 0, &tv) > 0)
                {
                        raw1394_loop_iterate(handle);
                }
        }

}








int IEC61883Input::write_frame(unsigned char *data, int len, int complete)
{
        if(!complete) printf("write_frame: incomplete frame received.\n");

        buffer_lock->lock("IEC61883Input write_frame 1");

// Get a buffer to transfer to
        char *dst = 0;
        int is_overflow = 0;
        if(!buffer_valid[current_inbuffer])
                dst = buffer[current_inbuffer];
        else
                is_overflow = 1;

        char *src = (char*)(data);
// static FILE *test = 0;
// if(!test) test = fopen("/tmp/test", "w");
// fwrite(src, buffer_size, 1, test);

// Export the video
        if(dst)
        {
                memcpy(dst, src, len);
                buffer_valid[current_inbuffer] = 1;
                video_lock->unlock();
        }


// Extract the audio
        if(audio_samples < INPUT_SAMPLES - 2048)
        {
                int audio_result = dv_read_audio(decoder, 
                        (unsigned char*)audio_buffer + 
                                audio_samples * 2 * 2,
                        (unsigned char*)src,
                        len,
                        channels,
                        bits);
                int real_freq = decoder->decoder->audio->frequency;
                if (real_freq == 32000) 
                {
// do in-place _FAST_ && _SIMPLE_ upsampling to 48khz
// i also think user should get a warning that his material is effectively 32khz
// we take 16bit samples for both channels in one 32bit int
                        int *twosample = (int*) (audio_buffer + audio_samples * 2 * 2);
                        int from = audio_result - 1;
                        int new_result = audio_result * 48000 / real_freq;
                        for (int to = new_result - 1; to >=0; to--)
                        {       
                                if ((to % 3) == 0 || (to % 3) == 1) from --;
                                twosample[to] = twosample[from];
                        }
                        audio_result = new_result;
                }


                audio_samples += audio_result;

// Export the audio
                audio_lock->unlock();
        }

// Advance buffer
        if(!is_overflow)
                increment_counter(&current_inbuffer);


        buffer_lock->unlock();
        return 0;
}







void IEC61883Input::increment_counter(int *counter)
{
        (*counter)++;
        if(*counter >= total_buffers) *counter = 0;
}

void IEC61883Input::decrement_counter(int *counter)
{
        (*counter)--;
        if(*counter < 0) *counter = total_buffers - 1;
}



int IEC61883Input::read_video(VFrame *data)
{
        int result = 0;

// Take over buffer table
        buffer_lock->lock("IEC61883Input::read_video 1");
// Wait for buffer with timeout
        while(!buffer_valid[current_outbuffer] && !result)
        {
                buffer_lock->unlock();
                result = video_lock->timed_lock(BUFFER_TIMEOUT, "IEC61883Input::read_video 2");
                buffer_lock->lock("IEC61883Input::read_video 3");
        }

// Copy frame
        if(buffer_valid[current_outbuffer])
        {
                data->allocate_compressed_data(buffer_size);
                data->set_compressed_size(buffer_size);
                memcpy(data->get_data(), buffer[current_outbuffer], buffer_size);
                buffer_valid[current_outbuffer] = 0;
                increment_counter(&current_outbuffer);
        }

        buffer_lock->unlock();
        return result;
}




int IEC61883Input::read_audio(char *data, int samples)
{
        int result = 0;
        int timeout = (int64_t)samples * (int64_t)1000000 * (int64_t)2 / (int64_t)samplerate;
        if(timeout < 500000) timeout = 500000;

// Take over buffer table
        buffer_lock->lock("IEC61883Input::read_audio 1");
// Wait for buffer with timeout
        while(audio_samples < samples && !result)
        {
                buffer_lock->unlock();
                result = audio_lock->timed_lock(timeout, "IEC61883Input::read_audio 2");
                buffer_lock->lock("IEC61883Input::read_audio 3");
        }

        if(audio_samples >= samples)
        {
                memcpy(data, audio_buffer, samples * bits * channels / 8);
                memcpy(audio_buffer, 
                        audio_buffer + samples * bits * channels / 8,
                        (audio_samples - samples) * bits * channels / 8);
                audio_samples -= samples;
        }

        buffer_lock->unlock();
        return result;
}

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