2 * Dirac decoder support via libdirac library
3 * Copyright (c) 2005 BBC, Andrew Kennedy <dirac at rd dot bbc dot co dot uk>
4 * Copyright (c) 2006-2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * @file libavcodec/libdiracdec.c
25 * Dirac decoder support via libdirac library; more details about the Dirac
26 * project can be found at http://dirac.sourceforge.net/.
27 * The libdirac_decoder library implements Dirac specification version 2.2
28 * (http://dirac.sourceforge.net/specification.html).
36 #include <libdirac_decoder/dirac_parser.h>
38 /** contains a single frame returned from Dirac */
39 typedef struct FfmpegDiracDecoderParams
42 dirac_decoder_t* p_decoder;
44 /** buffer to hold decoded frame */
45 unsigned char* p_out_frame_buf;
46 } FfmpegDiracDecoderParams;
50 * returns FFmpeg chroma format
52 static enum PixelFormat GetFfmpegChromaFormat(dirac_chroma_t dirac_pix_fmt)
54 int num_formats = sizeof(ffmpeg_dirac_pixel_format_map) /
55 sizeof(ffmpeg_dirac_pixel_format_map[0]);
58 for (idx = 0; idx < num_formats; ++idx) {
59 if (ffmpeg_dirac_pixel_format_map[idx].dirac_pix_fmt == dirac_pix_fmt) {
60 return ffmpeg_dirac_pixel_format_map[idx].ff_pix_fmt;
66 static av_cold int libdirac_decode_init(AVCodecContext *avccontext)
69 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data ;
70 p_dirac_params->p_decoder = dirac_decoder_init(avccontext->debug);
72 if (!p_dirac_params->p_decoder)
78 static int libdirac_decode_frame(AVCodecContext *avccontext,
79 void *data, int *data_size,
82 const uint8_t *buf = avpkt->data;
83 int buf_size = avpkt->size;
85 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data;
86 AVPicture *picture = data;
89 unsigned char *buffer[3];
94 /* set data to decode into buffer */
95 dirac_buffer (p_dirac_params->p_decoder, buf, buf+buf_size);
96 if ((buf[4] &0x08) == 0x08 && (buf[4] & 0x03))
97 avccontext->has_b_frames = 1;
100 /* parse data and process result */
101 DecoderState state = dirac_parse (p_dirac_params->p_decoder);
109 /* tell FFmpeg about sequence details */
110 dirac_sourceparams_t *src_params =
111 &p_dirac_params->p_decoder->src_params;
113 if (avcodec_check_dimensions(avccontext, src_params->width,
114 src_params->height) < 0) {
115 av_log(avccontext, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n",
116 src_params->width, src_params->height);
117 avccontext->height = avccontext->width = 0;
121 avccontext->height = src_params->height;
122 avccontext->width = src_params->width;
124 avccontext->pix_fmt = GetFfmpegChromaFormat(src_params->chroma);
125 if (avccontext->pix_fmt == PIX_FMT_NONE) {
126 av_log (avccontext, AV_LOG_ERROR,
127 "Dirac chroma format %d not supported currently\n",
132 avccontext->time_base.den = src_params->frame_rate.numerator;
133 avccontext->time_base.num = src_params->frame_rate.denominator;
135 /* calculate output dimensions */
136 avpicture_fill(&pic, NULL, avccontext->pix_fmt,
137 avccontext->width, avccontext->height);
139 pict_size = avpicture_get_size(avccontext->pix_fmt,
143 /* allocate output buffer */
144 if (p_dirac_params->p_out_frame_buf == NULL)
145 p_dirac_params->p_out_frame_buf = av_malloc (pict_size);
146 buffer[0] = p_dirac_params->p_out_frame_buf;
147 buffer[1] = p_dirac_params->p_out_frame_buf +
148 pic.linesize[0] * avccontext->height;
149 buffer[2] = buffer[1] +
150 pic.linesize[1] * src_params->chroma_height;
152 /* tell Dirac about output destination */
153 dirac_set_buf(p_dirac_params->p_decoder, buffer, NULL);
156 case STATE_SEQUENCE_END:
159 case STATE_PICTURE_AVAIL:
160 /* fill picture with current buffer data from Dirac */
161 avpicture_fill(picture, p_dirac_params->p_out_frame_buf,
163 avccontext->width, avccontext->height);
164 *data_size = sizeof(AVPicture);
179 static av_cold int libdirac_decode_close(AVCodecContext *avccontext)
181 FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data;
182 dirac_decoder_close (p_dirac_params->p_decoder);
184 av_freep(&p_dirac_params->p_out_frame_buf);
189 static void libdirac_flush (AVCodecContext *avccontext)
191 /* Got a seek request. We will need free memory held in the private
192 * context and free the current Dirac decoder handle and then open
193 * a new decoder handle. */
194 libdirac_decode_close (avccontext);
195 libdirac_decode_init (avccontext);
201 AVCodec libdirac_decoder = {
205 sizeof(FfmpegDiracDecoderParams),
206 libdirac_decode_init,
208 libdirac_decode_close,
209 libdirac_decode_frame,
211 .flush = libdirac_flush,
212 .long_name = NULL_IF_CONFIG_SMALL("libdirac Dirac 2.2"),