public VideoEncoder(int width, int height, int fps)
{
_converter = new VideoConverter(CODEC_PIXEL_FORMAT);
AVCodec* codec = FFmpegInvoke.avcodec_find_encoder(CODEC_ID);
if (codec == null) throw new Exception("Codec not found");
_codec_context = FFmpegInvoke.avcodec_alloc_context3(codec);
if (_codec_context == null) throw new Exception("Could not allocate video codec context");
_codec_context->bit_rate = 50000;
_codec_context->width = width;
_codec_context->height = height;
_codec_context->time_base = new AVRational() { num = 1, den = fps };
_codec_context->gop_size = 10; // emit one intra frame every ten frames
_codec_context->max_b_frames = 1;
_codec_context->pix_fmt = CODEC_PIXEL_FORMAT;
FFmpegInvoke.av_opt_set(_codec_context->priv_data, "preset", "fast", 0);
if (FFmpegInvoke.avcodec_open2(_codec_context, codec, null) < 0) throw new Exception("Could not open codec");
_avFrameYUV = FFmpegInvoke.avcodec_alloc_frame();
if (_avFrameYUV == null) throw new Exception("Could not allocate video frame");
_avFrameYUV->format = (int)CODEC_PIXEL_FORMAT;
_avFrameYUV->width = width;
_avFrameYUV->height = height;
var ret1 = FFmpegInvoke.av_image_alloc(&_avFrameYUV->data_0, _avFrameYUV->linesize, width, height, CODEC_PIXEL_FORMAT, 32);
if (ret1 < 0) throw new Exception("Could not allocate raw picture buffer");
_avFrameBGR = FFmpegInvoke.avcodec_alloc_frame();
if (_avFrameBGR == null) throw new Exception("Could not allocate video frame");
_avFrameBGR->format = (int)INPUT_PIXEL_FORMAT;
_avFrameBGR->width = width;
_avFrameBGR->height = height;
var ret2 = FFmpegInvoke.av_image_alloc(&_avFrameBGR->data_0, _avFrameBGR->linesize, width, height, INPUT_PIXEL_FORMAT, 32);
if (ret2 < 0) throw new Exception("Could not allocate raw picture buffer");
}
public static extern int av_compare_ts(long ts_a, AVRational tb_a, long ts_b, AVRational tb_b);
public static extern long av_rescale_q_rnd(long a, AVRational bq, AVRational cq, AVRounding p3);
/// <summary>
/// Initialize a <see cref="Rational"/>.
/// </summary>
/// <param name="AValue">The <see cref="Unsafe.AVRational"/>.</param>
internal Rational(Unsafe.AVRational AValue)
{
Value = AValue;
Reduce(ref this);
}
public static extern void av_stream_set_r_frame_rate(AVStream* s, AVRational r);
public static extern int av_opt_set_video_rate(void* obj, String name, AVRational val, int search_flags);
public static extern AVOption* av_set_q(void* obj, String name, AVRational n);
public static extern void av_codec_set_pkt_timebase(AVCodecContext* avctx, AVRational val);
public static extern AVRational av_div_q(AVRational b, AVRational c);
public static extern AVRational av_mul_q(AVRational b, AVRational c);
private static string ToDescString(AVRational value)
{
double dVal = Math.Floor(ToDouble(value) * 10.0) / 10;
return dVal.ToString();
}
private static double ToDouble(AVRational value)
{
return Convert.ToDouble(value.num) / Convert.ToDouble(value.den);
}
/// <summary>
/// Converts seconds to a timestamp value.
/// </summary>
/// <param name="seconds">The seconds.</param>
/// <param name="streamTimeBase">The stream time base.</param>
/// <returns></returns>
public static long SecondsToTimestamp(decimal seconds, AVRational streamTimeBase)
{
return Convert.ToInt64(Convert.ToDouble(seconds) * Convert.ToDouble(streamTimeBase.den) / Convert.ToDouble(streamTimeBase.num));
}
/// <summary>
/// Converts a Timestamp to seconds.
/// </summary>
/// <param name="ts">The ts.</param>
/// <param name="streamTimeBase">The stream time base.</param>
/// <returns></returns>
public static decimal TimestampToSeconds(long ts, AVRational streamTimeBase)
{
return Convert.ToDecimal(Convert.ToDouble(ts) * Convert.ToDouble(streamTimeBase.num) / Convert.ToDouble(streamTimeBase.den));
}
private double q2d(AVRational r)
{
return (double)r.num / (double)r.den;
}
public static extern long av_rescale_delta(AVRational in_tb, long in_ts, AVRational fs_tb, int duration, long* last, AVRational out_tb);
public static extern long av_add_stable(AVRational ts_tb, long ts, AVRational inc_tb, long inc);
public static extern AVRational av_add_q(AVRational b, AVRational c);
public static extern void av_packet_rescale_ts(AVPacket* pkt, AVRational tb_src, AVRational tb_dst);
public static extern AVRational av_sub_q(AVRational b, AVRational c);
public static extern int av_opt_eval_q(void* obj, AVOption* o, String val, AVRational* q_out);
public static extern int av_nearer_q(AVRational q, AVRational q1, AVRational q2);
public static extern int av_opt_get_video_rate(void* obj, String name, int search_flags, AVRational* out_val);
public static extern int av_find_nearest_q_idx(AVRational q, AVRational* q_list);
public static extern int av_image_check_sar(int w, int h, AVRational sar);
public static extern long av_rescale_q(long a, AVRational bq, AVRational cq);
