Simplify 'if' condition statements.
[libav.git] / libavcodec / libschroedingerdec.c
CommitLineData
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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
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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 */
43typedef 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
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67typedef struct FfmpegSchroParseUnitContext
68{
69 const uint8_t *buf;
70 int buf_size;
71} FfmpegSchroParseUnitContext;
72
73
74static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf,
75 void *priv);
76
77static 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
84static 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
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121/**
122* Returns FFmpeg chroma format.
123*/
124static 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 138static av_cold int libschroedinger_decode_init(AVCodecContext *avccontext)
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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
157static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf,
158 void *priv)
159{
160 av_freep(&priv);
161}
162
163static void libschroedinger_decode_frame_free (void *frame)
164{
165 schro_frame_unref(frame);
166}
167
168static 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;
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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;
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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])
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200 {
201 avpicture_alloc(&p_schro_params->dec_pic,
202 avccontext->pix_fmt,
203 avccontext->width,
204 avccontext->height);
205 }
206}
207
208static int libschroedinger_decode_frame(AVCodecContext *avccontext,
209 void *data, int *data_size,
7a00bbad 210 AVPacket *avpkt)
f7cd9eed 211{
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212 const uint8_t *buf = avpkt->data;
213 int buf_size = avpkt->size;
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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;
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223 int outer = 1;
224 FfmpegSchroParseUnitContext parse_ctx;
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225
226 *data_size = 0;
227
733cec1d 228 FfmpegSchroParseContextInit (&parse_ctx, buf, buf_size);
7c809dc3 229 if (!buf_size) {
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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
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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. */
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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;
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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;
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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;
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291 break;
292
293 case SCHRO_DECODER_ERROR:
294 return -1;
295 break;
296 }
297 }
733cec1d 298 } while(outer);
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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) {
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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 330static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext)
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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
346static 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
362AVCodec 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};