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ffmpeg / libavcodec / libschroedingerenc.c @ 72415b2a

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