Add Dirac support through libschroedinger.

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

Originally committed as revision 13046 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 310 insertions, 0 deletions

diff --git a/libavcodec/libschroedingerdec.c b/libavcodec/libschroedingerdec.c
new file mode 100644
index 0000000000..2f8c88f59c
--- /dev/null
+++ b/libavcodec/libschroedingerdec.c
@@ -0,0 +1,310 @@
+/*
+ * 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
+};