fileac3.C

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#include "asset.h"
#include "clip.h"
#include "fileac3.h"
#include "language.h"
#include "mwindow.inc"




#include <string.h>

FileAC3::FileAC3(Asset *asset, File *file)
 : FileBase(asset, file)
{
        reset_parameters();
}

FileAC3::~FileAC3()
{
        close_file();
}

int FileAC3::reset_parameters_derived()
{
        codec = 0;
        codec_context = 0;
        fd = 0;
        temp_raw = 0;
        temp_raw_size = 0;
        temp_raw_allocated = 0;
        temp_compressed = 0;
        compressed_allocated = 0;
}

void FileAC3::get_parameters(BC_WindowBase *parent_window, 
                Asset *asset, 
                BC_WindowBase* &format_window,
                int audio_options,
                int video_options)
{
        if(audio_options)
        {

                AC3ConfigAudio *window = new AC3ConfigAudio(parent_window, asset);
                format_window = window;
                window->create_objects();
                window->run_window();
                delete window;
        }
}

int FileAC3::check_sig()
{
// Libmpeg3 does this in FileMPEG.
        return 0;
}

int FileAC3::open_file(int rd, int wr)
{
        this->wr = wr;
        this->rd = rd;


        if(wr)
        {
                avcodec_init();
                avcodec_register_all();
                codec = avcodec_find_encoder(CODEC_ID_AC3);
                if(!codec)
                {
                        fprintf(stderr, 
                                "FileAC3::open_file codec not found.\n");
                        return 1;
                }
                codec_context = avcodec_alloc_context();
                codec_context->bit_rate = asset->ac3_bitrate * 1000;
                codec_context->sample_rate = asset->sample_rate;
                codec_context->channels = asset->channels;
                if(avcodec_open(codec_context, codec))
                {
                        fprintf(stderr, 
                                "FileAC3::open_file failed to open codec.\n");
                        return 1;
                }

                if(!(fd = fopen(asset->path, "w")))
                {
                        perror("FileAC3::open_file");
                        return 1;
                }
        }
        else
        {
                if(!(fd = fopen(asset->path, "r")))
                {
                        perror("FileAC3::open_file");
                        return 1;
                }
        }




        return 0;
}

int FileAC3::close_file()
{
        if(codec_context)
        {
                avcodec_close(codec_context);
                free(codec_context);
                codec_context = 0;
                codec = 0;
        }
        if(fd)
        {
                fclose(fd);
                fd = 0;
        }
        if(temp_raw)
        {
                delete [] temp_raw;
                temp_raw = 0;
        }
        if(temp_compressed)
        {
                delete [] temp_compressed;
                temp_compressed = 0;
        }
        reset_parameters();
        FileBase::close_file();
}

int FileAC3::write_samples(double **buffer, int64_t len)
{
// Convert buffer to encoder format
        if(temp_raw_size + len > temp_raw_allocated)
        {
                int new_allocated = temp_raw_size + len;
                int16_t *new_raw = new int16_t[new_allocated * asset->channels];
                if(temp_raw)
                {
                        memcpy(new_raw, 
                                temp_raw, 
                                sizeof(int16_t) * temp_raw_size * asset->channels);
                        delete [] temp_raw;
                }
                temp_raw = new_raw;
                temp_raw_allocated = new_allocated;
        }

// Allocate compressed data buffer
        if(temp_raw_allocated * asset->channels * 2 > compressed_allocated)
        {
                compressed_allocated = temp_raw_allocated * asset->channels * 2;
                delete [] temp_compressed;
                temp_compressed = new unsigned char[compressed_allocated];
        }

// Append buffer to temp raw
        int16_t *out_ptr = temp_raw + temp_raw_size * asset->channels;
        for(int i = 0; i < len; i++)
        {
                for(int j = 0; j < asset->channels; j++)
                {
                        int sample = (int)(buffer[j][i] * 32767);
                        CLAMP(sample, -32768, 32767);
                        *out_ptr++ = sample;
                }
        }
        temp_raw_size += len;

        int frame_size = codec_context->frame_size;
        int output_size = 0;
        int current_sample = 0;
        for(current_sample = 0; 
                current_sample + frame_size <= temp_raw_size; 
                current_sample += frame_size)
        {
                int compressed_size = avcodec_encode_audio(
                        codec_context, 
                        temp_compressed + output_size, 
                        compressed_allocated - output_size, 
            temp_raw + current_sample * asset->channels);
                output_size += compressed_size;
        }

// Shift buffer back
        memcpy(temp_raw,
                temp_raw + current_sample * asset->channels,
                (temp_raw_size - current_sample) * sizeof(int16_t) * asset->channels);
        temp_raw_size -= current_sample;

        int bytes_written = fwrite(temp_compressed, 1, output_size, fd);
        if(bytes_written < output_size)
        {
                perror("FileAC3::write_samples");
                return 1;
        }
        return 0;
}







AC3ConfigAudio::AC3ConfigAudio(BC_WindowBase *parent_window,
        Asset *asset)
 : BC_Window(PROGRAM_NAME ": Audio Compression",
        parent_window->get_abs_cursor_x(1),
        parent_window->get_abs_cursor_y(1),
        500,
        BC_OKButton::calculate_h() + 100,
        500,
        BC_OKButton::calculate_h() + 100,
        0,
        0,
        1)
{
        this->parent_window = parent_window;
        this->asset = asset;
}

void AC3ConfigAudio::create_objects()
{
        int x = 10, y = 10;
        int x1 = 150;
        add_tool(new BC_Title(x, y, "Bitrate (kbps):"));
        AC3ConfigAudioBitrate *bitrate;
        add_tool(bitrate = 
                new AC3ConfigAudioBitrate(this,
                        x1, 
                        y));
        bitrate->create_objects();

        add_subwindow(new BC_OKButton(this));
        show_window();
        flush();
}

int AC3ConfigAudio::close_event()
{
        set_done(0);
        return 1;
}






AC3ConfigAudioBitrate::AC3ConfigAudioBitrate(AC3ConfigAudio *gui, 
        int x, 
        int y)
 : BC_PopupMenu(x,
        y,
        150,
        AC3ConfigAudioBitrate::bitrate_to_string(gui->string, gui->asset->ac3_bitrate))
{
        this->gui = gui;
}

char* AC3ConfigAudioBitrate::bitrate_to_string(char *string, int bitrate)
{
        sprintf(string, "%d", bitrate);
        return string;
}

void AC3ConfigAudioBitrate::create_objects()
{
        add_item(new BC_MenuItem("32"));
        add_item(new BC_MenuItem("40"));
        add_item(new BC_MenuItem("48"));
        add_item(new BC_MenuItem("56"));
        add_item(new BC_MenuItem("64"));
        add_item(new BC_MenuItem("80"));
        add_item(new BC_MenuItem("96"));
        add_item(new BC_MenuItem("112"));
        add_item(new BC_MenuItem("128"));
        add_item(new BC_MenuItem("160"));
        add_item(new BC_MenuItem("192"));
        add_item(new BC_MenuItem("224"));
        add_item(new BC_MenuItem("256"));
        add_item(new BC_MenuItem("320"));
        add_item(new BC_MenuItem("384"));
        add_item(new BC_MenuItem("448"));
        add_item(new BC_MenuItem("512"));
        add_item(new BC_MenuItem("576"));
        add_item(new BC_MenuItem("640"));
}

int AC3ConfigAudioBitrate::handle_event()
{
        gui->asset->ac3_bitrate = atol(get_text());
        return 1;
}

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