2008-05-03 05:47:26 +02:00
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/*
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* Dirac decoder support via libdirac library
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* Copyright (c) 2005 BBC, Andrew Kennedy <dirac at rd dot bbc dot co dot uk>
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* Copyright (c) 2006-2008 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 libdiracdec.c
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* Dirac decoder support via libdirac library; more details about the Dirac
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* project can be found at http://dirac.sourceforge.net/.
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* The libdirac_decoder 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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#include "libdirac.h"
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#undef NDEBUG
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#include <assert.h>
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#include <libdirac_decoder/dirac_parser.h>
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/** contains a single frame returned from Dirac */
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typedef struct FfmpegDiracDecoderParams
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{
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/** decoder handle */
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dirac_decoder_t* p_decoder;
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/** buffer to hold decoded frame */
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unsigned char* p_out_frame_buf;
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} FfmpegDiracDecoderParams;
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/**
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* returns FFmpeg chroma format
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*/
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static enum PixelFormat GetFfmpegChromaFormat(dirac_chroma_t dirac_pix_fmt)
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{
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int num_formats = sizeof(ffmpeg_dirac_pixel_format_map) /
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sizeof(ffmpeg_dirac_pixel_format_map[0]);
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int idx;
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for (idx = 0; idx < num_formats; ++idx) {
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if (ffmpeg_dirac_pixel_format_map[idx].dirac_pix_fmt == dirac_pix_fmt) {
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return ffmpeg_dirac_pixel_format_map[idx].ff_pix_fmt;
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}
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}
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return PIX_FMT_NONE;
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}
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static int libdirac_decode_init(AVCodecContext *avccontext)
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{
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FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data ;
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p_dirac_params->p_decoder = dirac_decoder_init(avccontext->debug);
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if (!p_dirac_params->p_decoder)
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return -1;
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return 0 ;
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}
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static int libdirac_decode_frame(AVCodecContext *avccontext,
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void *data, int *data_size,
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const uint8_t *buf, int buf_size)
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{
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FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data;
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AVPicture *picture = data;
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AVPicture pic;
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int pict_size;
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unsigned char *buffer[3];
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*data_size = 0;
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if (buf_size>0)
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/* set data to decode into buffer */
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dirac_buffer (p_dirac_params->p_decoder, buf, buf+buf_size);
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while (1) {
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/* parse data and process result */
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DecoderState state = dirac_parse (p_dirac_params->p_decoder);
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switch (state)
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{
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case STATE_BUFFER:
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return buf_size;
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case STATE_SEQUENCE:
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{
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/* tell FFmpeg about sequence details */
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dirac_sourceparams_t *src_params =
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&p_dirac_params->p_decoder->src_params;
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if (avcodec_check_dimensions(avccontext, src_params->width,
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src_params->height) < 0) {
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av_log(avccontext, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n",
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src_params->width, src_params->height);
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avccontext->height = avccontext->width = 0;
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return -1;
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}
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avccontext->height = src_params->height;
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avccontext->width = src_params->width;
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avccontext->pix_fmt = GetFfmpegChromaFormat(src_params->chroma);
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if (avccontext->pix_fmt == PIX_FMT_NONE) {
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av_log (avccontext, AV_LOG_ERROR,
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"Dirac chroma format %d not supported currently\n",
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src_params->chroma);
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return -1;
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}
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avccontext->time_base.den = src_params->frame_rate.numerator;
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avccontext->time_base.num = src_params->frame_rate.denominator;
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/* calculate output dimensions */
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avpicture_fill(&pic, NULL, avccontext->pix_fmt,
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avccontext->width, avccontext->height);
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pict_size = avpicture_get_size(avccontext->pix_fmt,
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avccontext->width,
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avccontext->height);
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/* allocate output buffer */
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if (p_dirac_params->p_out_frame_buf == NULL)
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p_dirac_params->p_out_frame_buf = av_malloc (pict_size);
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buffer[0] = p_dirac_params->p_out_frame_buf;
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buffer[1] = p_dirac_params->p_out_frame_buf +
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pic.linesize[0] * avccontext->height;
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buffer[2] = buffer[1] +
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pic.linesize[1] * src_params->chroma_height;
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/* tell Dirac about output destination */
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dirac_set_buf(p_dirac_params->p_decoder, buffer, NULL);
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break;
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}
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case STATE_SEQUENCE_END:
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break;
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case STATE_PICTURE_AVAIL:
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/* fill picture with current buffer data from Dirac */
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avpicture_fill(picture, p_dirac_params->p_out_frame_buf,
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avccontext->pix_fmt,
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avccontext->width, avccontext->height);
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*data_size = sizeof(AVPicture);
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return buf_size;
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case STATE_INVALID:
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return -1;
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default:
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break;
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}
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}
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return buf_size;
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}
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static int libdirac_decode_close(AVCodecContext *avccontext)
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{
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FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data;
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dirac_decoder_close (p_dirac_params->p_decoder);
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av_freep(&p_dirac_params->p_out_frame_buf);
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return 0 ;
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}
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static void libdirac_flush (AVCodecContext *avccontext)
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{
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/* Got a seek request. We will need free memory held in the private
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* context and free the current Dirac decoder handle and then open
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* a new decoder handle. */
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libdirac_decode_close (avccontext);
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libdirac_decode_init (avccontext);
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return;
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}
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AVCodec libdirac_decoder = {
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"libdirac",
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CODEC_TYPE_VIDEO,
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CODEC_ID_DIRAC,
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sizeof(FfmpegDiracDecoderParams),
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libdirac_decode_init,
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NULL,
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libdirac_decode_close,
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libdirac_decode_frame,
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CODEC_CAP_DELAY,
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2008-05-17 12:20:01 +02:00
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.flush = libdirac_flush,
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.long_name = "libdirac Dirac 2.2",
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2008-05-03 05:47:26 +02:00
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} ;
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