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f7cd9eed AS |
1 | /* |
2 | * Dirac decoder support via Schroedinger libraries | |
3 | * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com > | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | /** | |
bad5537e | 23 | * @file libavcodec/libschroedingerdec.c |
f7cd9eed AS |
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). | |
28 | */ | |
29 | ||
30 | #include "avcodec.h" | |
31 | #include "libdirac_libschro.h" | |
32 | #include "libschroedinger.h" | |
33 | ||
34 | #undef NDEBUG | |
35 | #include <assert.h> | |
36 | ||
37 | ||
38 | #include <schroedinger/schro.h> | |
39 | #include <schroedinger/schrodebug.h> | |
40 | #include <schroedinger/schrovideoformat.h> | |
41 | ||
42 | /** libschroedinger decoder private data */ | |
43 | typedef struct FfmpegSchroDecoderParams | |
44 | { | |
45 | /** Schroedinger video format */ | |
46 | SchroVideoFormat *format; | |
47 | ||
48 | /** Schroedinger frame format */ | |
49 | SchroFrameFormat frame_format; | |
50 | ||
51 | /** decoder handle */ | |
52 | SchroDecoder* decoder; | |
53 | ||
54 | /** queue storing decoded frames */ | |
55 | FfmpegDiracSchroQueue dec_frame_queue; | |
56 | ||
57 | /** end of sequence signalled */ | |
58 | int eos_signalled; | |
59 | ||
60 | /** end of sequence pulled */ | |
61 | int eos_pulled; | |
62 | ||
63 | /** decoded picture */ | |
64 | AVPicture dec_pic; | |
65 | } FfmpegSchroDecoderParams; | |
66 | ||
733cec1d AS |
67 | typedef struct FfmpegSchroParseUnitContext |
68 | { | |
69 | const uint8_t *buf; | |
70 | int buf_size; | |
71 | } FfmpegSchroParseUnitContext; | |
72 | ||
73 | ||
74 | static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf, | |
75 | void *priv); | |
76 | ||
77 | static void FfmpegSchroParseContextInit (FfmpegSchroParseUnitContext *parse_ctx, | |
78 | const uint8_t *buf, int buf_size) | |
79 | { | |
80 | parse_ctx->buf = buf; | |
81 | parse_ctx->buf_size = buf_size; | |
82 | } | |
83 | ||
84 | static SchroBuffer* FfmpegFindNextSchroParseUnit (FfmpegSchroParseUnitContext *parse_ctx) | |
85 | { | |
86 | SchroBuffer *enc_buf = NULL; | |
87 | int next_pu_offset = 0; | |
88 | unsigned char *in_buf; | |
89 | ||
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') | |
95 | return NULL; | |
96 | ||
97 | next_pu_offset = (parse_ctx->buf[5] << 24) + | |
98 | (parse_ctx->buf[6] << 16) + | |
99 | (parse_ctx->buf[7] << 8) + | |
100 | parse_ctx->buf[8]; | |
101 | ||
102 | if (next_pu_offset == 0 && | |
103 | SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4])) | |
104 | next_pu_offset = 13; | |
105 | ||
106 | if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset) | |
107 | return NULL; | |
108 | ||
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; | |
114 | ||
115 | parse_ctx->buf += next_pu_offset; | |
116 | parse_ctx->buf_size -= next_pu_offset; | |
117 | ||
118 | return enc_buf; | |
119 | } | |
120 | ||
f7cd9eed AS |
121 | /** |
122 | * Returns FFmpeg chroma format. | |
123 | */ | |
124 | static enum PixelFormat GetFfmpegChromaFormat(SchroChromaFormat schro_pix_fmt) | |
125 | { | |
126 | int num_formats = sizeof(ffmpeg_schro_pixel_format_map) / | |
127 | sizeof(ffmpeg_schro_pixel_format_map[0]); | |
128 | int idx; | |
129 | ||
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; | |
133 | } | |
134 | } | |
135 | return PIX_FMT_NONE; | |
136 | } | |
137 | ||
5ef251e5 | 138 | static av_cold int libschroedinger_decode_init(AVCodecContext *avccontext) |
f7cd9eed AS |
139 | { |
140 | ||
141 | FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data ; | |
142 | /* First of all, initialize our supporting libraries. */ | |
143 | schro_init(); | |
144 | ||
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); | |
148 | ||
149 | if (!p_schro_params->decoder) | |
150 | return -1; | |
151 | ||
152 | /* Initialize the decoded frame queue. */ | |
153 | ff_dirac_schro_queue_init (&p_schro_params->dec_frame_queue); | |
154 | return 0 ; | |
155 | } | |
156 | ||
157 | static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf, | |
158 | void *priv) | |
159 | { | |
160 | av_freep(&priv); | |
161 | } | |
162 | ||
163 | static void libschroedinger_decode_frame_free (void *frame) | |
164 | { | |
165 | schro_frame_unref(frame); | |
166 | } | |
167 | ||
168 | static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext) | |
169 | { | |
170 | FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; | |
171 | SchroDecoder *decoder = p_schro_params->decoder; | |
172 | ||
173 | p_schro_params->format = schro_decoder_get_video_format (decoder); | |
174 | ||
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; | |
35027edd | 181 | return; |
f7cd9eed AS |
182 | } |
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); | |
187 | ||
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"); | |
35027edd | 193 | return; |
f7cd9eed AS |
194 | } |
195 | ||
196 | avccontext->time_base.den = p_schro_params->format->frame_rate_numerator; | |
197 | avccontext->time_base.num = p_schro_params->format->frame_rate_denominator; | |
198 | ||
7c809dc3 | 199 | if (!p_schro_params->dec_pic.data[0]) |
f7cd9eed AS |
200 | { |
201 | avpicture_alloc(&p_schro_params->dec_pic, | |
202 | avccontext->pix_fmt, | |
203 | avccontext->width, | |
204 | avccontext->height); | |
205 | } | |
206 | } | |
207 | ||
208 | static int libschroedinger_decode_frame(AVCodecContext *avccontext, | |
209 | void *data, int *data_size, | |
7a00bbad | 210 | AVPacket *avpkt) |
f7cd9eed | 211 | { |
7a00bbad TB |
212 | const uint8_t *buf = avpkt->data; |
213 | int buf_size = avpkt->size; | |
f7cd9eed AS |
214 | |
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; | |
220 | SchroFrame* frame; | |
221 | int state; | |
222 | int go = 1; | |
733cec1d AS |
223 | int outer = 1; |
224 | FfmpegSchroParseUnitContext parse_ctx; | |
f7cd9eed AS |
225 | |
226 | *data_size = 0; | |
227 | ||
733cec1d | 228 | FfmpegSchroParseContextInit (&parse_ctx, buf, buf_size); |
7c809dc3 | 229 | if (!buf_size) { |
f7cd9eed AS |
230 | if (!p_schro_params->eos_signalled) { |
231 | state = schro_decoder_push_end_of_stream(decoder); | |
232 | p_schro_params->eos_signalled = 1; | |
233 | } | |
234 | } | |
235 | ||
733cec1d AS |
236 | /* Loop through all the individual parse units in the input buffer */ |
237 | do { | |
238 | if ((enc_buf = FfmpegFindNextSchroParseUnit(&parse_ctx))) { | |
239 | /* Push buffer into decoder. */ | |
64bfc584 AS |
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; | |
733cec1d AS |
243 | state = schro_decoder_push (decoder, enc_buf); |
244 | if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT) | |
245 | libschroedinger_handle_first_access_unit(avccontext); | |
246 | go = 1; | |
247 | } | |
248 | else | |
249 | outer = 0; | |
f7cd9eed AS |
250 | format = p_schro_params->format; |
251 | ||
252 | while (go) { | |
253 | /* Parse data and process result. */ | |
254 | state = schro_decoder_wait (decoder); | |
255 | switch (state) | |
256 | { | |
257 | case SCHRO_DECODER_FIRST_ACCESS_UNIT: | |
258 | libschroedinger_handle_first_access_unit (avccontext); | |
259 | break; | |
260 | ||
261 | case SCHRO_DECODER_NEED_BITS: | |
262 | /* Need more input data - stop iterating over what we have. */ | |
263 | go = 0; | |
264 | break; | |
265 | ||
266 | case SCHRO_DECODER_NEED_FRAME: | |
267 | /* Decoder needs a frame - create one and push it in. */ | |
268 | ||
269 | frame = schro_frame_new_and_alloc(NULL, | |
270 | p_schro_params->frame_format, | |
271 | format->width, | |
272 | format->height); | |
273 | schro_decoder_add_output_picture (decoder, frame); | |
274 | break; | |
275 | ||
276 | case SCHRO_DECODER_OK: | |
277 | /* Pull a frame out of the decoder. */ | |
278 | frame = schro_decoder_pull (decoder); | |
279 | ||
280 | if (frame) { | |
281 | ff_dirac_schro_queue_push_back( | |
282 | &p_schro_params->dec_frame_queue, | |
283 | frame); | |
284 | } | |
285 | break; | |
286 | case SCHRO_DECODER_EOS: | |
287 | go = 0; | |
288 | p_schro_params->eos_pulled = 1; | |
289 | schro_decoder_reset (decoder); | |
733cec1d | 290 | outer = 0; |
f7cd9eed AS |
291 | break; |
292 | ||
293 | case SCHRO_DECODER_ERROR: | |
294 | return -1; | |
295 | break; | |
296 | } | |
297 | } | |
733cec1d | 298 | } while(outer); |
f7cd9eed AS |
299 | |
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); | |
302 | ||
7c809dc3 | 303 | if (frame) { |
f7cd9eed AS |
304 | memcpy (p_schro_params->dec_pic.data[0], |
305 | frame->components[0].data, | |
306 | frame->components[0].length); | |
307 | ||
308 | memcpy (p_schro_params->dec_pic.data[1], | |
309 | frame->components[1].data, | |
310 | frame->components[1].length); | |
311 | ||
312 | memcpy (p_schro_params->dec_pic.data[2], | |
313 | frame->components[2].data, | |
314 | frame->components[2].length); | |
315 | ||
316 | /* Fill picture with current buffer data from Schroedinger. */ | |
317 | avpicture_fill(picture, p_schro_params->dec_pic.data[0], | |
318 | avccontext->pix_fmt, | |
319 | avccontext->width, avccontext->height); | |
320 | ||
321 | *data_size = sizeof(AVPicture); | |
322 | ||
323 | /* Now free the frame resources. */ | |
324 | libschroedinger_decode_frame_free (frame); | |
325 | } | |
326 | return buf_size; | |
327 | } | |
328 | ||
329 | ||
5ef251e5 | 330 | static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext) |
f7cd9eed AS |
331 | { |
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); | |
336 | ||
337 | avpicture_free (&p_schro_params->dec_pic); | |
338 | ||
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); | |
342 | ||
343 | return 0 ; | |
344 | } | |
345 | ||
346 | static void libschroedinger_flush (AVCodecContext *avccontext) | |
347 | { | |
348 | /* Got a seek request. Free the decoded frames queue and then reset | |
349 | * the decoder */ | |
350 | FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data; | |
351 | ||
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); | |
355 | ||
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; | |
360 | } | |
361 | ||
362 | AVCodec libschroedinger_decoder = { | |
363 | "libschroedinger", | |
364 | CODEC_TYPE_VIDEO, | |
365 | CODEC_ID_DIRAC, | |
366 | sizeof(FfmpegSchroDecoderParams), | |
367 | libschroedinger_decode_init, | |
368 | NULL, | |
369 | libschroedinger_decode_close, | |
370 | libschroedinger_decode_frame, | |
371 | CODEC_CAP_DELAY, | |
9f4aa353 | 372 | .flush = libschroedinger_flush, |
fe4bf374 | 373 | .long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"), |
f7cd9eed | 374 | }; |