2 * Dirac decoder support via Schroedinger libraries
3 * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * @file libavcodec/libschroedingerdec.c
24 * Dirac decoder support via libschroedinger-1.0 libraries. More details about
25 * the Schroedinger project can be found at http://www.diracvideo.org/.
26 * The library implements Dirac Specification Version 2.2.
27 * (http://dirac.sourceforge.net/specification.html).
31 #include "libdirac_libschro.h"
32 #include "libschroedinger.h"
38 #include <schroedinger/schro.h>
39 #include <schroedinger/schrodebug.h>
40 #include <schroedinger/schrovideoformat.h>
42 /** libschroedinger decoder private data */
43 typedef struct FfmpegSchroDecoderParams
45 /** Schroedinger video format */
46 SchroVideoFormat
*format
;
48 /** Schroedinger frame format */
49 SchroFrameFormat frame_format
;
52 SchroDecoder
* decoder
;
54 /** queue storing decoded frames */
55 FfmpegDiracSchroQueue dec_frame_queue
;
57 /** end of sequence signalled */
60 /** end of sequence pulled */
63 /** decoded picture */
65 } FfmpegSchroDecoderParams
;
67 typedef struct FfmpegSchroParseUnitContext
71 } FfmpegSchroParseUnitContext
;
74 static void libschroedinger_decode_buffer_free (SchroBuffer
*schro_buf
,
77 static void FfmpegSchroParseContextInit (FfmpegSchroParseUnitContext
*parse_ctx
,
78 const uint8_t *buf
, int buf_size
)
81 parse_ctx
->buf_size
= buf_size
;
84 static SchroBuffer
* FfmpegFindNextSchroParseUnit (FfmpegSchroParseUnitContext
*parse_ctx
)
86 SchroBuffer
*enc_buf
= NULL
;
87 int next_pu_offset
= 0;
88 unsigned char *in_buf
;
90 if (parse_ctx
->buf_size
< 13 ||
91 parse_ctx
->buf
[0] != 'B' ||
92 parse_ctx
->buf
[1] != 'B' ||
93 parse_ctx
->buf
[2] != 'C' ||
94 parse_ctx
->buf
[3] != 'D')
97 next_pu_offset
= (parse_ctx
->buf
[5] << 24) +
98 (parse_ctx
->buf
[6] << 16) +
99 (parse_ctx
->buf
[7] << 8) +
102 if (next_pu_offset
== 0 &&
103 SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx
->buf
[4]))
106 if (next_pu_offset
<= 0 || parse_ctx
->buf_size
< next_pu_offset
)
109 in_buf
= av_malloc(next_pu_offset
);
110 memcpy (in_buf
, parse_ctx
->buf
, next_pu_offset
);
111 enc_buf
= schro_buffer_new_with_data (in_buf
, next_pu_offset
);
112 enc_buf
->free
= libschroedinger_decode_buffer_free
;
113 enc_buf
->priv
= in_buf
;
115 parse_ctx
->buf
+= next_pu_offset
;
116 parse_ctx
->buf_size
-= next_pu_offset
;
122 * Returns FFmpeg chroma format.
124 static enum PixelFormat
GetFfmpegChromaFormat(SchroChromaFormat schro_pix_fmt
)
126 int num_formats
= sizeof(ffmpeg_schro_pixel_format_map
) /
127 sizeof(ffmpeg_schro_pixel_format_map
[0]);
130 for (idx
= 0; idx
< num_formats
; ++idx
) {
131 if (ffmpeg_schro_pixel_format_map
[idx
].schro_pix_fmt
== schro_pix_fmt
) {
132 return ffmpeg_schro_pixel_format_map
[idx
].ff_pix_fmt
;
138 static av_cold
int libschroedinger_decode_init(AVCodecContext
*avccontext
)
141 FfmpegSchroDecoderParams
*p_schro_params
= avccontext
->priv_data
;
142 /* First of all, initialize our supporting libraries. */
145 schro_debug_set_level(avccontext
->debug
);
146 p_schro_params
->decoder
= schro_decoder_new();
147 schro_decoder_set_skip_ratio(p_schro_params
->decoder
, 1);
149 if (!p_schro_params
->decoder
)
152 /* Initialize the decoded frame queue. */
153 ff_dirac_schro_queue_init (&p_schro_params
->dec_frame_queue
);
157 static void libschroedinger_decode_buffer_free (SchroBuffer
*schro_buf
,
163 static void libschroedinger_decode_frame_free (void *frame
)
165 schro_frame_unref(frame
);
168 static void libschroedinger_handle_first_access_unit(AVCodecContext
*avccontext
)
170 FfmpegSchroDecoderParams
*p_schro_params
= avccontext
->priv_data
;
171 SchroDecoder
*decoder
= p_schro_params
->decoder
;
173 p_schro_params
->format
= schro_decoder_get_video_format (decoder
);
175 /* Tell FFmpeg about sequence details. */
176 if(avcodec_check_dimensions(avccontext
, p_schro_params
->format
->width
,
177 p_schro_params
->format
->height
) < 0) {
178 av_log(avccontext
, AV_LOG_ERROR
, "invalid dimensions (%dx%d)\n",
179 p_schro_params
->format
->width
, p_schro_params
->format
->height
);
180 avccontext
->height
= avccontext
->width
= 0;
183 avccontext
->height
= p_schro_params
->format
->height
;
184 avccontext
->width
= p_schro_params
->format
->width
;
185 avccontext
->pix_fmt
=
186 GetFfmpegChromaFormat(p_schro_params
->format
->chroma_format
);
188 if (ff_get_schro_frame_format( p_schro_params
->format
->chroma_format
,
189 &p_schro_params
->frame_format
) == -1) {
190 av_log (avccontext
, AV_LOG_ERROR
,
191 "This codec currently only supports planar YUV 4:2:0, 4:2:2 "
192 "and 4:4:4 formats.\n");
196 avccontext
->time_base
.den
= p_schro_params
->format
->frame_rate_numerator
;
197 avccontext
->time_base
.num
= p_schro_params
->format
->frame_rate_denominator
;
199 if (p_schro_params
->dec_pic
.data
[0] == NULL
)
201 avpicture_alloc(&p_schro_params
->dec_pic
,
208 static int libschroedinger_decode_frame(AVCodecContext
*avccontext
,
209 void *data
, int *data_size
,
212 const uint8_t *buf
= avpkt
->data
;
213 int buf_size
= avpkt
->size
;
215 FfmpegSchroDecoderParams
*p_schro_params
= avccontext
->priv_data
;
216 SchroDecoder
*decoder
= p_schro_params
->decoder
;
217 SchroVideoFormat
*format
;
218 AVPicture
*picture
= data
;
219 SchroBuffer
*enc_buf
;
224 FfmpegSchroParseUnitContext parse_ctx
;
228 FfmpegSchroParseContextInit (&parse_ctx
, buf
, buf_size
);
230 if (!p_schro_params
->eos_signalled
) {
231 state
= schro_decoder_push_end_of_stream(decoder
);
232 p_schro_params
->eos_signalled
= 1;
236 /* Loop through all the individual parse units in the input buffer */
238 if ((enc_buf
= FfmpegFindNextSchroParseUnit(&parse_ctx
))) {
239 /* Push buffer into decoder. */
240 if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf
->data
[4]) &&
241 SCHRO_PARSE_CODE_NUM_REFS(enc_buf
->data
[4]) > 0)
242 avccontext
->has_b_frames
= 1;
243 state
= schro_decoder_push (decoder
, enc_buf
);
244 if (state
== SCHRO_DECODER_FIRST_ACCESS_UNIT
)
245 libschroedinger_handle_first_access_unit(avccontext
);
250 format
= p_schro_params
->format
;
253 /* Parse data and process result. */
254 state
= schro_decoder_wait (decoder
);
257 case SCHRO_DECODER_FIRST_ACCESS_UNIT
:
258 libschroedinger_handle_first_access_unit (avccontext
);
261 case SCHRO_DECODER_NEED_BITS
:
262 /* Need more input data - stop iterating over what we have. */
266 case SCHRO_DECODER_NEED_FRAME
:
267 /* Decoder needs a frame - create one and push it in. */
269 frame
= schro_frame_new_and_alloc(NULL
,
270 p_schro_params
->frame_format
,
273 schro_decoder_add_output_picture (decoder
, frame
);
276 case SCHRO_DECODER_OK
:
277 /* Pull a frame out of the decoder. */
278 frame
= schro_decoder_pull (decoder
);
281 ff_dirac_schro_queue_push_back(
282 &p_schro_params
->dec_frame_queue
,
286 case SCHRO_DECODER_EOS
:
288 p_schro_params
->eos_pulled
= 1;
289 schro_decoder_reset (decoder
);
293 case SCHRO_DECODER_ERROR
:
300 /* Grab next frame to be returned from the top of the queue. */
301 frame
= ff_dirac_schro_queue_pop(&p_schro_params
->dec_frame_queue
);
304 memcpy (p_schro_params
->dec_pic
.data
[0],
305 frame
->components
[0].data
,
306 frame
->components
[0].length
);
308 memcpy (p_schro_params
->dec_pic
.data
[1],
309 frame
->components
[1].data
,
310 frame
->components
[1].length
);
312 memcpy (p_schro_params
->dec_pic
.data
[2],
313 frame
->components
[2].data
,
314 frame
->components
[2].length
);
316 /* Fill picture with current buffer data from Schroedinger. */
317 avpicture_fill(picture
, p_schro_params
->dec_pic
.data
[0],
319 avccontext
->width
, avccontext
->height
);
321 *data_size
= sizeof(AVPicture
);
323 /* Now free the frame resources. */
324 libschroedinger_decode_frame_free (frame
);
330 static av_cold
int libschroedinger_decode_close(AVCodecContext
*avccontext
)
332 FfmpegSchroDecoderParams
*p_schro_params
= avccontext
->priv_data
;
333 /* Free the decoder. */
334 schro_decoder_free (p_schro_params
->decoder
);
335 av_freep(&p_schro_params
->format
);
337 avpicture_free (&p_schro_params
->dec_pic
);
339 /* Free data in the output frame queue. */
340 ff_dirac_schro_queue_free (&p_schro_params
->dec_frame_queue
,
341 libschroedinger_decode_frame_free
);
346 static void libschroedinger_flush (AVCodecContext
*avccontext
)
348 /* Got a seek request. Free the decoded frames queue and then reset
350 FfmpegSchroDecoderParams
*p_schro_params
= avccontext
->priv_data
;
352 /* Free data in the output frame queue. */
353 ff_dirac_schro_queue_free (&p_schro_params
->dec_frame_queue
,
354 libschroedinger_decode_frame_free
);
356 ff_dirac_schro_queue_init (&p_schro_params
->dec_frame_queue
);
357 schro_decoder_reset(p_schro_params
->decoder
);
358 p_schro_params
->eos_pulled
= 0;
359 p_schro_params
->eos_signalled
= 0;
362 AVCodec libschroedinger_decoder
= {
366 sizeof(FfmpegSchroDecoderParams
),
367 libschroedinger_decode_init
,
369 libschroedinger_decode_close
,
370 libschroedinger_decode_frame
,
372 .flush
= libschroedinger_flush
,
373 .long_name
= NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),