/* * Dirac encoder support via Schroedinger libraries * Copyright (c) 2008 BBC, Anuradha Suraparaju * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file libavcodec/libschroedingerenc.c * Dirac encoder support via libschroedinger-1.0 libraries. More details about * the Schroedinger project can be found at http://www.diracvideo.org/. * The library implements Dirac Specification Version 2.2 * (http://dirac.sourceforge.net/specification.html). */ #undef NDEBUG #include #include #include #include #include "avcodec.h" #include "libdirac_libschro.h" #include "libschroedinger.h" /** libschroedinger encoder private data */ typedef struct FfmpegSchroEncoderParams { /** Schroedinger video format */ SchroVideoFormat *format; /** Schroedinger frame format */ SchroFrameFormat frame_format; /** frame being encoded */ AVFrame picture; /** frame size */ int frame_size; /** Schroedinger encoder handle*/ SchroEncoder* encoder; /** buffer to store encoder output before writing it to the frame queue*/ unsigned char *enc_buf; /** Size of encoder buffer*/ int enc_buf_size; /** queue storing encoded frames */ FfmpegDiracSchroQueue enc_frame_queue; /** end of sequence signalled */ int eos_signalled; /** end of sequence pulled */ int eos_pulled; } FfmpegSchroEncoderParams; /** * Works out Schro-compatible chroma format. */ static int SetSchroChromaFormat(AVCodecContext *avccontext) { int num_formats = sizeof(ffmpeg_schro_pixel_format_map) / sizeof(ffmpeg_schro_pixel_format_map[0]); int idx; FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data; for (idx = 0; idx < num_formats; ++idx) { if (ffmpeg_schro_pixel_format_map[idx].ff_pix_fmt == avccontext->pix_fmt) { p_schro_params->format->chroma_format = ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt; return 0; } } av_log (avccontext, AV_LOG_ERROR, "This codec currently only supports planar YUV 4:2:0, 4:2:2" " and 4:4:4 formats.\n"); return -1; } static int libschroedinger_encode_init(AVCodecContext *avccontext) { FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data; SchroVideoFormatEnum preset; /* Initialize the libraries that libschroedinger depends on. */ schro_init(); /* Create an encoder object. */ p_schro_params->encoder = schro_encoder_new(); if (!p_schro_params->encoder) { av_log(avccontext, AV_LOG_ERROR, "Unrecoverable Error: schro_encoder_new failed. "); return -1; } /* Initialize the format. */ preset = ff_get_schro_video_format_preset(avccontext); p_schro_params->format = schro_encoder_get_video_format(p_schro_params->encoder); schro_video_format_set_std_video_format (p_schro_params->format, preset); p_schro_params->format->width = avccontext->width; p_schro_params->format->height = avccontext->height; if (SetSchroChromaFormat(avccontext) == -1) return -1; if (ff_get_schro_frame_format(p_schro_params->format->chroma_format, &p_schro_params->frame_format) == -1) { av_log (avccontext, AV_LOG_ERROR, "This codec currently supports only planar YUV 4:2:0, 4:2:2" " and 4:4:4 formats.\n"); return -1; } p_schro_params->format->frame_rate_numerator = avccontext->time_base.den; p_schro_params->format->frame_rate_denominator = avccontext->time_base.num; p_schro_params->frame_size = avpicture_get_size(avccontext->pix_fmt, avccontext->width, avccontext->height); avccontext->coded_frame = &p_schro_params->picture; if (!avccontext->gop_size) { schro_encoder_setting_set_double (p_schro_params->encoder, "gop_structure", SCHRO_ENCODER_GOP_INTRA_ONLY); if (avccontext->coder_type == FF_CODER_TYPE_VLC) schro_encoder_setting_set_double (p_schro_params->encoder, "enable_noarith", 1); } else { schro_encoder_setting_set_double (p_schro_params->encoder, "gop_structure", SCHRO_ENCODER_GOP_BIREF); avccontext->has_b_frames = 1; } /* FIXME - Need to handle SCHRO_ENCODER_RATE_CONTROL_LOW_DELAY. */ if (avccontext->flags & CODEC_FLAG_QSCALE) { if (!avccontext->global_quality) { /* lossless coding */ schro_encoder_setting_set_double (p_schro_params->encoder, "rate_control", SCHRO_ENCODER_RATE_CONTROL_LOSSLESS); } else { int noise_threshold; schro_encoder_setting_set_double (p_schro_params->encoder, "rate_control", SCHRO_ENCODER_RATE_CONTROL_CONSTANT_NOISE_THRESHOLD); noise_threshold = avccontext->global_quality/FF_QP2LAMBDA; if (noise_threshold > 100) noise_threshold = 100; schro_encoder_setting_set_double (p_schro_params->encoder, "noise_threshold", noise_threshold); } } else { schro_encoder_setting_set_double ( p_schro_params->encoder, "rate_control", SCHRO_ENCODER_RATE_CONTROL_CONSTANT_BITRATE); schro_encoder_setting_set_double (p_schro_params->encoder, "bitrate", avccontext->bit_rate); } if (avccontext->flags & CODEC_FLAG_INTERLACED_ME) /* All material can be coded as interlaced or progressive irrespective of the type of source material. */ schro_encoder_setting_set_double (p_schro_params->encoder, "interlaced_coding", 1); /* FIXME: Signal range hardcoded to 8-bit data until both libschroedinger * and libdirac support other bit-depth data. */ schro_video_format_set_std_signal_range(p_schro_params->format, SCHRO_SIGNAL_RANGE_8BIT_VIDEO); /* Set the encoder format. */ schro_encoder_set_video_format(p_schro_params->encoder, p_schro_params->format); /* Set the debug level. */ schro_debug_set_level (avccontext->debug); schro_encoder_start (p_schro_params->encoder); /* Initialize the encoded frame queue. */ ff_dirac_schro_queue_init (&p_schro_params->enc_frame_queue); return 0 ; } static SchroFrame *libschroedinger_frame_from_data (AVCodecContext *avccontext, void *in_data) { FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data; SchroFrame *in_frame; /* Input line size may differ from what the codec supports. Especially * when transcoding from one format to another. So use avpicture_layout * to copy the frame. */ in_frame = schro_frame_new_and_alloc (NULL, p_schro_params->frame_format, p_schro_params->format->width, p_schro_params->format->height); avpicture_layout ((AVPicture *)in_data, avccontext->pix_fmt, avccontext->width, avccontext->height, in_frame->components[0].data, p_schro_params->frame_size); return in_frame; } static void SchroedingerFreeFrame(void *data) { FfmpegDiracSchroEncodedFrame *enc_frame = data; av_freep (&(enc_frame->p_encbuf)); av_free(enc_frame); } static int libschroedinger_encode_frame(AVCodecContext *avccontext, unsigned char *frame, int buf_size, void *data) { int enc_size = 0; FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data; SchroEncoder *encoder = p_schro_params->encoder; struct FfmpegDiracSchroEncodedFrame* p_frame_output = NULL; int go = 1; SchroBuffer *enc_buf; int presentation_frame; int parse_code; int last_frame_in_sequence = 0; if(data == NULL) { /* Push end of sequence if not already signalled. */ if (!p_schro_params->eos_signalled) { schro_encoder_end_of_stream(encoder); p_schro_params->eos_signalled = 1; } } else { /* Allocate frame data to schro input buffer. */ SchroFrame *in_frame = libschroedinger_frame_from_data (avccontext, data); /* Load next frame. */ schro_encoder_push_frame(encoder, in_frame); } if (p_schro_params->eos_pulled) go = 0; /* Now check to see if we have any output from the encoder. */ while (go) { SchroStateEnum state; state = schro_encoder_wait(encoder); switch (state) { case SCHRO_STATE_HAVE_BUFFER: case SCHRO_STATE_END_OF_STREAM: enc_buf = schro_encoder_pull (encoder, &presentation_frame); assert (enc_buf->length > 0); assert (enc_buf->length <= buf_size); parse_code = enc_buf->data[4]; /* All non-frame data is prepended to actual frame data to * be able to set the pts correctly. So we don't write data * to the frame output queue until we actually have a frame */ p_schro_params->enc_buf = av_realloc ( p_schro_params->enc_buf, p_schro_params->enc_buf_size + enc_buf->length ); memcpy(p_schro_params->enc_buf+p_schro_params->enc_buf_size, enc_buf->data, enc_buf->length); p_schro_params->enc_buf_size += enc_buf->length; if (state == SCHRO_STATE_END_OF_STREAM) { p_schro_params->eos_pulled = 1; go = 0; } if (!SCHRO_PARSE_CODE_IS_PICTURE(parse_code)) { schro_buffer_unref (enc_buf); break; } /* Create output frame. */ p_frame_output = av_mallocz(sizeof(FfmpegDiracSchroEncodedFrame)); /* Set output data. */ p_frame_output->size = p_schro_params->enc_buf_size; p_frame_output->p_encbuf = p_schro_params->enc_buf; if (SCHRO_PARSE_CODE_IS_INTRA(parse_code) && SCHRO_PARSE_CODE_IS_REFERENCE(parse_code)) p_frame_output->key_frame = 1; /* Parse the coded frame number from the bitstream. Bytes 14 * through 17 represesent the frame number. */ p_frame_output->frame_num = (enc_buf->data[13] << 24) + (enc_buf->data[14] << 16) + (enc_buf->data[15] << 8) + enc_buf->data[16]; ff_dirac_schro_queue_push_back (&p_schro_params->enc_frame_queue, p_frame_output); p_schro_params->enc_buf_size = 0; p_schro_params->enc_buf = NULL; schro_buffer_unref (enc_buf); break; case SCHRO_STATE_NEED_FRAME: go = 0; break; case SCHRO_STATE_AGAIN: break; default: av_log(avccontext, AV_LOG_ERROR, "Unknown Schro Encoder state\n"); return -1; } } /* Copy 'next' frame in queue. */ if (p_schro_params->enc_frame_queue.size == 1 && p_schro_params->eos_pulled) last_frame_in_sequence = 1; p_frame_output = ff_dirac_schro_queue_pop (&p_schro_params->enc_frame_queue); if (!p_frame_output) return 0; memcpy(frame, p_frame_output->p_encbuf, p_frame_output->size); avccontext->coded_frame->key_frame = p_frame_output->key_frame; /* Use the frame number of the encoded frame as the pts. It is OK to * do so since Dirac is a constant frame rate codec. It expects input * to be of constant frame rate. */ avccontext->coded_frame->pts = p_frame_output->frame_num; enc_size = p_frame_output->size; /* Append the end of sequence information to the last frame in the * sequence. */ if (last_frame_in_sequence && p_schro_params->enc_buf_size > 0) { memcpy (frame + enc_size, p_schro_params->enc_buf, p_schro_params->enc_buf_size); enc_size += p_schro_params->enc_buf_size; av_freep (&p_schro_params->enc_buf); p_schro_params->enc_buf_size = 0; } /* free frame */ SchroedingerFreeFrame (p_frame_output); return enc_size; } static int libschroedinger_encode_close(AVCodecContext *avccontext) { FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data; /* Close the encoder. */ schro_encoder_free(p_schro_params->encoder); /* Free data in the output frame queue. */ ff_dirac_schro_queue_free (&p_schro_params->enc_frame_queue, SchroedingerFreeFrame); /* Free the encoder buffer. */ if (p_schro_params->enc_buf_size) av_freep(&p_schro_params->enc_buf); /* Free the video format structure. */ av_freep(&p_schro_params->format); return 0 ; } AVCodec libschroedinger_encoder = { "libschroedinger", CODEC_TYPE_VIDEO, CODEC_ID_DIRAC, sizeof(FfmpegSchroEncoderParams), libschroedinger_encode_init, libschroedinger_encode_frame, libschroedinger_encode_close, .capabilities= CODEC_CAP_DELAY, .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_NONE}, .long_name= NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"), };