Add Dirac support through libschroedinger.

patch by Anuradha Suraparaju, anuradha rd.bbc.co uk


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@13046 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -98,6 +98,7 @@ show_help(){
   echo "  --enable-libmp3lame      enable MP3 encoding via libmp3lame [default=no]"
   echo "  --enable-libnut          enable NUT (de)muxing via libnut,"
   echo "                           native demuxer exists [default=no]"
+  echo "  --enable-libschroedinger enable Dirac support via libschroedinger [default=no]"
   echo "  --enable-libtheora       enable Theora encoding via libtheora [default=no]"
   echo "  --enable-libvorbis       enable Vorbis encoding via libvorbis,"
   echo "                           native implementation exists [default=no]"
@@ -649,6 +650,7 @@ CONFIG_LIST="
     libgsm
     libmp3lame
     libnut
+    libschroedinger
     libtheora
     libvorbis
     libx264
@@ -834,6 +836,8 @@ libgsm_encoder_deps="libgsm"
 libgsm_ms_decoder_deps="libgsm"
 libgsm_ms_encoder_deps="libgsm"
 libmp3lame_encoder_deps="libmp3lame"
+libschroedinger_decoder_deps="libschroedinger"
+libschroedinger_encoder_deps="libschroedinger"
 libtheora_encoder_deps="libtheora"
 libvorbis_encoder_deps="libvorbis"
 libx264_encoder_deps="libx264"
@@ -1637,6 +1641,8 @@ enabled libfaad    && require2 libfaad faad.h faacDecOpen -lfaad
 enabled libgsm     && require  libgsm gsm.h gsm_create -lgsm
 enabled libmp3lame && require  LAME lame/lame.h lame_init -lmp3lame -lm
 enabled libnut     && require  libnut libnut.h nut_demuxer_init -lnut
+enabled libschroedinger && add_cflags $(pkg-config --cflags schroedinger-1.0) \
+                        && require libschroedinger schroedinger/schro.h schro_init -lschroedinger-1.0 -lpthread -loil-0.3 -lm -lrt
 enabled libtheora  && require  libtheora theora/theora.h theora_info_init -ltheora -logg
 enabled libvorbis  && require  libvorbis vorbis/vorbisenc.h vorbis_info_init -lvorbisenc -lvorbis -logg
 enabled libx264    && require  x264 x264.h x264_encoder_open -lx264 -lm
@@ -1923,6 +1929,7 @@ echo "libfaad dlopened          ${libfaadbin-no}"
 echo "libgsm enabled            ${libgsm-no}"
 echo "libmp3lame enabled        ${libmp3lame-no}"
 echo "libnut enabled            ${libnut-no}"
+echo "libschroedinger enabled   ${libschroedinger-no}"
 echo "libtheora enabled         ${libtheora-no}"
 echo "libvorbis enabled         ${libvorbis-no}"
 echo "x264 enabled              ${libx264-no}"

libavcodec/Makefile

@@ -325,6 +325,8 @@ OBJS-$(CONFIG_LIBFAAC)                 += libfaac.o
 OBJS-$(CONFIG_LIBFAAD)                 += libfaad.o
 OBJS-$(CONFIG_LIBGSM)                  += libgsm.o
 OBJS-$(CONFIG_LIBMP3LAME)              += libmp3lame.o
+OBJS-$(CONFIG_LIBSCHROEDINGER_DECODER) += libschroedingerdec.o libschroedinger.o libdirac_libschro.o
+OBJS-$(CONFIG_LIBSCHROEDINGER_ENCODER) += libschroedingerenc.o libschroedinger.o libdirac_libschro.o
 OBJS-$(CONFIG_LIBTHEORA)               += libtheoraenc.o
 OBJS-$(CONFIG_LIBVORBIS)               += libvorbis.o
 OBJS-$(CONFIG_LIBX264)                 += libx264.o

libavcodec/allcodecs.c

@@ -283,6 +283,7 @@ void avcodec_register_all(void)
     REGISTER_ENCDEC  (LIBGSM, libgsm);
     REGISTER_ENCDEC  (LIBGSM_MS, libgsm_ms);
     REGISTER_ENCODER (LIBMP3LAME, libmp3lame);
+    REGISTER_ENCDEC  (LIBSCHROEDINGER, libschroedinger);
     REGISTER_ENCODER (LIBTHEORA, libtheora);
     REGISTER_ENCODER (LIBVORBIS, libvorbis);
     REGISTER_ENCODER (LIBX264, libx264);

libavcodec/libschroedinger.c

+/*
+ * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
+ *
+ * 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 libschroedinger.c
+* function definitions common to libschroedingerdec.c and libschroedingerenc.c
+*/
+
+#include "libdirac_libschro.h"
+#include "libschroedinger.h"
+
+/**
+* Schroedinger video preset table. Ensure that this tables matches up correctly
+* with the ff_dirac_schro_video_format_info table in libdirac_libschro.c.
+*/
+static const SchroVideoFormatEnum ff_schro_video_formats[]={
+    SCHRO_VIDEO_FORMAT_CUSTOM     ,
+    SCHRO_VIDEO_FORMAT_QSIF       ,
+    SCHRO_VIDEO_FORMAT_QCIF       ,
+    SCHRO_VIDEO_FORMAT_SIF        ,
+    SCHRO_VIDEO_FORMAT_CIF        ,
+    SCHRO_VIDEO_FORMAT_4SIF       ,
+    SCHRO_VIDEO_FORMAT_4CIF       ,
+    SCHRO_VIDEO_FORMAT_SD480I_60  ,
+    SCHRO_VIDEO_FORMAT_SD576I_50  ,
+    SCHRO_VIDEO_FORMAT_HD720P_60  ,
+    SCHRO_VIDEO_FORMAT_HD720P_50  ,
+    SCHRO_VIDEO_FORMAT_HD1080I_60 ,
+    SCHRO_VIDEO_FORMAT_HD1080I_50 ,
+    SCHRO_VIDEO_FORMAT_HD1080P_60 ,
+    SCHRO_VIDEO_FORMAT_HD1080P_50 ,
+    SCHRO_VIDEO_FORMAT_DC2K_24    ,
+    SCHRO_VIDEO_FORMAT_DC4K_24    ,
+};
+
+SchroVideoFormatEnum ff_get_schro_video_format_preset(AVCodecContext *avccontext)
+{
+    unsigned int num_formats = sizeof(ff_schro_video_formats) /
+                               sizeof(ff_schro_video_formats[0]);
+
+    unsigned int idx = ff_dirac_schro_get_video_format_idx (avccontext);
+
+    return (idx < num_formats) ?
+                 ff_schro_video_formats[idx] : SCHRO_VIDEO_FORMAT_CUSTOM;
+}
+
+int ff_get_schro_frame_format (SchroChromaFormat schro_pix_fmt,
+                               SchroFrameFormat  *schro_frame_fmt)
+{
+    unsigned int num_formats = sizeof(ffmpeg_schro_pixel_format_map) /
+                               sizeof(ffmpeg_schro_pixel_format_map[0]);
+
+    int idx;
+
+    for (idx = 0; idx < num_formats; ++idx) {
+        if (ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt) {
+            *schro_frame_fmt =
+                         ffmpeg_schro_pixel_format_map[idx].schro_frame_fmt;
+            return 0;
+        }
+    }
+    return -1;
+}

libavcodec/libschroedinger.h

+/*
+ * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
+ *
+ * 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 libschroedinger.h
+* data structures common to libschroedingerdec.c and libschroedingerenc.c
+*/
+
+#ifndef FFMPEG_LIBSCHROEDINGER_H
+#define FFMPEG_LIBSCHROEDINGER_H
+
+#include "config.h"
+
+#ifdef CONFIG_LIBSCHROEDINGER
+
+#include <schroedinger/schrobitstream.h>
+#include <schroedinger/schroframe.h>
+#include "avcodec.h"
+
+static const struct {
+    enum PixelFormat  ff_pix_fmt;
+    SchroChromaFormat schro_pix_fmt;
+    SchroFrameFormat  schro_frame_fmt;
+} ffmpeg_schro_pixel_format_map[] = {
+    { PIX_FMT_YUV420P, SCHRO_CHROMA_420, SCHRO_FRAME_FORMAT_U8_420 },
+    { PIX_FMT_YUV422P, SCHRO_CHROMA_422, SCHRO_FRAME_FORMAT_U8_422 },
+    { PIX_FMT_YUV444P, SCHRO_CHROMA_444, SCHRO_FRAME_FORMAT_U8_444 },
+};
+
+/**
+* Returns the video format preset matching the input video dimensions and
+* time base.
+*/
+SchroVideoFormatEnum ff_get_schro_video_format_preset (AVCodecContext *avccontext);
+
+/**
+* Sets the Schroedinger frame format corresponding to the Schro chroma format
+* passed. Returns 0 on success, -1 on failure.
+*/
+int ff_get_schro_frame_format (SchroChromaFormat schro_chroma_fmt,
+                               SchroFrameFormat  *schro_frame_fmt);
+
+#endif /* CONFIG_LIBSCHROEDINGER */
+#endif /* FFMPEG_LIBSCHROEDINGER_H */

libavcodec/libschroedingerdec.c

+/*
+ * Dirac decoder support via Schroedinger libraries
+ * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
+ *
+ * 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 libschroedingerdec.c
+* Dirac decoder 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).
+*/
+
+#include "avcodec.h"
+#include "libdirac_libschro.h"
+#include "libschroedinger.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+
+#include <schroedinger/schro.h>
+#include <schroedinger/schrodebug.h>
+#include <schroedinger/schrovideoformat.h>
+
+/** libschroedinger decoder private data */
+typedef struct FfmpegSchroDecoderParams
+{
+    /** Schroedinger video format */
+    SchroVideoFormat *format;
+
+    /** Schroedinger frame format */
+    SchroFrameFormat frame_format;
+
+    /** decoder handle */
+    SchroDecoder* decoder;
+
+    /** queue storing decoded frames */
+    FfmpegDiracSchroQueue dec_frame_queue;
+
+    /** end of sequence signalled */
+    int eos_signalled;
+
+    /** end of sequence pulled */
+    int eos_pulled;
+
+    /** decoded picture */
+    AVPicture dec_pic;
+} FfmpegSchroDecoderParams;
+
+/**
+* Returns FFmpeg chroma format.
+*/
+static enum PixelFormat GetFfmpegChromaFormat(SchroChromaFormat schro_pix_fmt)
+{
+    int num_formats = sizeof(ffmpeg_schro_pixel_format_map) /
+                      sizeof(ffmpeg_schro_pixel_format_map[0]);
+    int idx;
+
+    for (idx = 0; idx < num_formats; ++idx) {
+        if (ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt) {
+            return ffmpeg_schro_pixel_format_map[idx].ff_pix_fmt;
+        }
+    }
+    return PIX_FMT_NONE;
+}
+
+/*-------------------------DECODER------------------------------------------*/
+
+static int libschroedinger_decode_init(AVCodecContext *avccontext)
+{
+
+    FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data ;
+    /* First of all, initialize our supporting libraries. */
+    schro_init();
+
+    schro_debug_set_level(avccontext->debug);
+    p_schro_params->decoder =  schro_decoder_new();
+    schro_decoder_set_skip_ratio(p_schro_params->decoder, 1);
+
+    if (!p_schro_params->decoder)
+        return -1;
+
+    /* Initialize the decoded frame queue. */
+    ff_dirac_schro_queue_init (&p_schro_params->dec_frame_queue);
+    return 0 ;
+}
+
+static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf,
+                                                void *priv)
+{
+    av_freep(&priv);
+}
+
+static void libschroedinger_decode_frame_free (void *frame)
+{
+    schro_frame_unref(frame);
+}
+
+static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext)
+{
+    FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
+    SchroDecoder *decoder = p_schro_params->decoder;
+
+    p_schro_params->format = schro_decoder_get_video_format (decoder);
+
+    /* Tell FFmpeg about sequence details. */
+    if(avcodec_check_dimensions(avccontext, p_schro_params->format->width,
+                                p_schro_params->format->height) < 0) {
+        av_log(avccontext, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n",
+               p_schro_params->format->width, p_schro_params->format->height);
+        avccontext->height = avccontext->width = 0;
+        return -1;
+    }
+    avccontext->height  = p_schro_params->format->height;
+    avccontext->width   = p_schro_params->format->width;
+    avccontext->pix_fmt =
+                   GetFfmpegChromaFormat(p_schro_params->format->chroma_format);
+
+    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 only supports planar YUV 4:2:0, 4:2:2 "
+                "and 4:4:4 formats.\n");
+        return -1;
+    }
+
+    avccontext->time_base.den = p_schro_params->format->frame_rate_numerator;
+    avccontext->time_base.num = p_schro_params->format->frame_rate_denominator;
+
+    if (p_schro_params->dec_pic.data[0] == NULL)
+    {
+        avpicture_alloc(&p_schro_params->dec_pic,
+                        avccontext->pix_fmt,
+                        avccontext->width,
+                        avccontext->height);
+    }
+}
+
+static int libschroedinger_decode_frame(AVCodecContext *avccontext,
+                                        void *data, int *data_size,
+                                        const uint8_t *buf, int buf_size)
+{
+
+    FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
+    SchroDecoder *decoder = p_schro_params->decoder;
+    SchroVideoFormat *format;
+    AVPicture *picture = data;
+    SchroBuffer *enc_buf;
+    SchroFrame* frame;
+    int state;
+    int go = 1;
+
+    *data_size = 0;
+
+    if (buf_size>0) {
+        unsigned char *in_buf = av_malloc(buf_size);
+        memcpy (in_buf, buf, buf_size);
+        enc_buf = schro_buffer_new_with_data (in_buf, buf_size);
+        enc_buf->free = libschroedinger_decode_buffer_free;
+        enc_buf->priv = in_buf;
+        /* Push buffer into decoder. */
+        state = schro_decoder_push (decoder, enc_buf);
+        if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
+            libschroedinger_handle_first_access_unit(avccontext);
+    } else {
+        if (!p_schro_params->eos_signalled) {
+            state = schro_decoder_push_end_of_stream(decoder);
+            p_schro_params->eos_signalled = 1;
+        }
+    }
+
+    format = p_schro_params->format;
+
+    while (go) {
+        /* Parse data and process result. */
+        state = schro_decoder_wait (decoder);
+        switch (state)
+        {
+        case SCHRO_DECODER_FIRST_ACCESS_UNIT:
+            libschroedinger_handle_first_access_unit (avccontext);
+            break;
+
+        case SCHRO_DECODER_NEED_BITS:
+            /* Need more input data - stop iterating over what we have. */
+            go = 0;
+            break;
+
+        case SCHRO_DECODER_NEED_FRAME:
+            /* Decoder needs a frame - create one and push it in. */
+
+            frame = schro_frame_new_and_alloc(NULL,
+                                              p_schro_params->frame_format,
+                                              format->width,
+                                              format->height);
+            schro_decoder_add_output_picture (decoder, frame);
+            break;
+
+        case SCHRO_DECODER_OK:
+            /* Pull a frame out of the decoder. */
+            frame = schro_decoder_pull (decoder);
+
+            if (frame) {
+                ff_dirac_schro_queue_push_back(
+                                             &p_schro_params->dec_frame_queue,
+                                             frame);
+            }
+            break;
+        case SCHRO_DECODER_EOS:
+            go = 0;
+            p_schro_params->eos_pulled = 1;
+            schro_decoder_reset (decoder);
+            break;
+
+        case SCHRO_DECODER_ERROR:
+            return -1;
+            break;
+        }
+    }
+
+    /* Grab next frame to be returned from the top of the queue. */
+    frame = ff_dirac_schro_queue_pop(&p_schro_params->dec_frame_queue);
+
+    if (frame != NULL) {
+        memcpy (p_schro_params->dec_pic.data[0],
+                frame->components[0].data,
+                frame->components[0].length);
+
+        memcpy (p_schro_params->dec_pic.data[1],
+                frame->components[1].data,
+                frame->components[1].length);
+
+        memcpy (p_schro_params->dec_pic.data[2],
+                frame->components[2].data,
+                frame->components[2].length);
+
+        /* Fill picture with current buffer data from Schroedinger. */
+        avpicture_fill(picture, p_schro_params->dec_pic.data[0],
+                       avccontext->pix_fmt,
+                       avccontext->width, avccontext->height);
+
+        *data_size = sizeof(AVPicture);
+
+        /* Now free the frame resources. */
+        libschroedinger_decode_frame_free (frame);
+    }
+    return buf_size;
+}
+
+
+static int libschroedinger_decode_close(AVCodecContext *avccontext)
+{
+    FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
+    /* Free the decoder. */
+    schro_decoder_free (p_schro_params->decoder);
+    av_freep(&p_schro_params->format);
+
+    avpicture_free (&p_schro_params->dec_pic);
+
+    /* Free data in the output frame queue. */
+    ff_dirac_schro_queue_free (&p_schro_params->dec_frame_queue,
+                               libschroedinger_decode_frame_free);
+
+    return 0 ;
+}
+
+static void libschroedinger_flush (AVCodecContext *avccontext)
+{
+    /* Got a seek request. Free the decoded frames queue and then reset
+     * the decoder */
+    FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
+
+    /* Free data in the output frame queue. */
+    ff_dirac_schro_queue_free (&p_schro_params->dec_frame_queue,
+                               libschroedinger_decode_frame_free);
+
+    ff_dirac_schro_queue_init (&p_schro_params->dec_frame_queue);
+    schro_decoder_reset(p_schro_params->decoder);
+    p_schro_params->eos_pulled = 0;
+    p_schro_params->eos_signalled = 0;
+}
+
+AVCodec libschroedinger_decoder = {
+     "libschroedinger",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_DIRAC,
+    sizeof(FfmpegSchroDecoderParams),
+    libschroedinger_decode_init,
+    NULL,
+    libschroedinger_decode_close,
+    libschroedinger_decode_frame,
+    CODEC_CAP_DELAY,
+    .flush = libschroedinger_flush
+};

libavcodec/libschroedingerenc.c

+/*
+ * Dirac encoder support via Schroedinger libraries
+ * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
+ *
+ * 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 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 <assert.h>
+
+#include <schroedinger/schro.h>
+#include <schroedinger/schrodebug.h>
+#include <schroedinger/schrovideoformat.h>
+
+#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;
+
+    /** 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 == 0){
+        schro_encoder_setting_set_double (p_schro_params->encoder,
+                                          "gop_structure",
+                                          SCHRO_ENCODER_GOP_INTRA_ONLY);
+    }
+    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 == 0) {
+            /* 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);
+
+
+    /* Hardcode motion vector precision to quarter pixel. */
+    schro_encoder_setting_set_double (p_schro_params->encoder,
+                                      "mv_precision", 2);
+
+    /* 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;
+
+    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);
+
+            /* Create output frame. */
+            p_frame_output = av_mallocz(sizeof(FfmpegDiracSchroEncodedFrame));
+            /* Set output data. */
+            p_frame_output->size     = enc_buf->length;
+            p_frame_output->p_encbuf = av_malloc(enc_buf->length);
+            memcpy(p_frame_output->p_encbuf, enc_buf->data, enc_buf->length);
+
+            parse_code = enc_buf->data[4];
+            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. */
+            if (SCHRO_PARSE_CODE_IS_PICTURE(parse_code))
+            {
+                assert (enc_buf->length >= 17);
+                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);
+            schro_buffer_unref (enc_buf);
+
+            if (state == SCHRO_STATE_END_OF_STREAM) {
+                p_schro_params->eos_pulled = 1;
+                   go = 0;
+            }
+            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. */
+    p_frame_output =
+               ff_dirac_schro_queue_pop (&p_schro_params->enc_frame_queue);
+
+    if (p_frame_output == NULL)
+        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;
+
+    /* 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 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, -1},
+};