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path: root/libavcodec/libschroedingerdec.c (plain)
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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/**
23* @file
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 <string.h>
31
32#include "libavutil/imgutils.h"
33#include "libavutil/internal.h"
34#include "libavutil/intreadwrite.h"
35#include "libavutil/mem.h"
36#include "avcodec.h"
37#include "internal.h"
38#include "libschroedinger.h"
39
40#include <schroedinger/schro.h>
41#include <schroedinger/schrodebug.h>
42#include <schroedinger/schrovideoformat.h>
43
44/** SchroFrame and Pts relation */
45typedef struct LibSchroFrameContext {
46 SchroFrame *frame;
47 int64_t pts;
48} LibSchroFrameContext;
49
50/** libschroedinger decoder private data */
51typedef struct SchroDecoderParams {
52 /** Schroedinger video format */
53 SchroVideoFormat *format;
54
55 /** Schroedinger frame format */
56 SchroFrameFormat frame_format;
57
58 /** decoder handle */
59 SchroDecoder* decoder;
60
61 /** queue storing decoded frames */
62 FFSchroQueue dec_frame_queue;
63
64 /** end of sequence signalled */
65 int eos_signalled;
66
67 /** end of sequence pulled */
68 int eos_pulled;
69} SchroDecoderParams;
70
71typedef struct SchroParseUnitContext {
72 const uint8_t *buf;
73 int buf_size;
74} SchroParseUnitContext;
75
76
77static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
78 void *priv)
79{
80 av_freep(&priv);
81}
82
83static void parse_context_init(SchroParseUnitContext *parse_ctx,
84 const uint8_t *buf, int buf_size)
85{
86 parse_ctx->buf = buf;
87 parse_ctx->buf_size = buf_size;
88}
89
90static SchroBuffer *find_next_parse_unit(SchroParseUnitContext *parse_ctx)
91{
92 SchroBuffer *enc_buf = NULL;
93 int next_pu_offset = 0;
94 unsigned char *in_buf;
95
96 if (parse_ctx->buf_size < 13 ||
97 parse_ctx->buf[0] != 'B' ||
98 parse_ctx->buf[1] != 'B' ||
99 parse_ctx->buf[2] != 'C' ||
100 parse_ctx->buf[3] != 'D')
101 return NULL;
102
103 next_pu_offset = (parse_ctx->buf[5] << 24) +
104 (parse_ctx->buf[6] << 16) +
105 (parse_ctx->buf[7] << 8) +
106 parse_ctx->buf[8];
107
108 if (next_pu_offset == 0 &&
109 SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4]))
110 next_pu_offset = 13;
111
112 if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset)
113 return NULL;
114
115 in_buf = av_malloc(next_pu_offset);
116 if (!in_buf) {
117 av_log(parse_ctx, AV_LOG_ERROR, "Unable to allocate input buffer\n");
118 return NULL;
119 }
120
121 memcpy(in_buf, parse_ctx->buf, next_pu_offset);
122 enc_buf = schro_buffer_new_with_data(in_buf, next_pu_offset);
123 enc_buf->free = libschroedinger_decode_buffer_free;
124 enc_buf->priv = in_buf;
125
126 parse_ctx->buf += next_pu_offset;
127 parse_ctx->buf_size -= next_pu_offset;
128
129 return enc_buf;
130}
131
132/**
133* Returns FFmpeg chroma format.
134*/
135static enum AVPixelFormat get_chroma_format(SchroChromaFormat schro_pix_fmt)
136{
137 int num_formats = sizeof(schro_pixel_format_map) /
138 sizeof(schro_pixel_format_map[0]);
139 int idx;
140
141 for (idx = 0; idx < num_formats; ++idx)
142 if (schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt)
143 return schro_pixel_format_map[idx].ff_pix_fmt;
144 return AV_PIX_FMT_NONE;
145}
146
147static av_cold int libschroedinger_decode_init(AVCodecContext *avctx)
148{
149
150 SchroDecoderParams *p_schro_params = avctx->priv_data;
151 /* First of all, initialize our supporting libraries. */
152 schro_init();
153
154 schro_debug_set_level(avctx->debug);
155 p_schro_params->decoder = schro_decoder_new();
156 schro_decoder_set_skip_ratio(p_schro_params->decoder, 1);
157
158 if (!p_schro_params->decoder)
159 return -1;
160
161 /* Initialize the decoded frame queue. */
162 ff_schro_queue_init(&p_schro_params->dec_frame_queue);
163 return 0;
164}
165
166static void libschroedinger_decode_frame_free(void *frame)
167{
168 schro_frame_unref(frame);
169}
170
171static void libschroedinger_handle_first_access_unit(AVCodecContext *avctx)
172{
173 SchroDecoderParams *p_schro_params = avctx->priv_data;
174 SchroDecoder *decoder = p_schro_params->decoder;
175
176 p_schro_params->format = schro_decoder_get_video_format(decoder);
177
178 /* Tell FFmpeg about sequence details. */
179 if (av_image_check_size(p_schro_params->format->width,
180 p_schro_params->format->height, 0, avctx) < 0) {
181 av_log(avctx, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n",
182 p_schro_params->format->width, p_schro_params->format->height);
183 avctx->height = avctx->width = 0;
184 return;
185 }
186 avctx->height = p_schro_params->format->height;
187 avctx->width = p_schro_params->format->width;
188 avctx->pix_fmt = get_chroma_format(p_schro_params->format->chroma_format);
189
190 if (ff_get_schro_frame_format(p_schro_params->format->chroma_format,
191 &p_schro_params->frame_format) == -1) {
192 av_log(avctx, AV_LOG_ERROR,
193 "This codec currently only supports planar YUV 4:2:0, 4:2:2 "
194 "and 4:4:4 formats.\n");
195 return;
196 }
197
198 avctx->framerate.num = p_schro_params->format->frame_rate_numerator;
199 avctx->framerate.den = p_schro_params->format->frame_rate_denominator;
200}
201
202static int libschroedinger_decode_frame(AVCodecContext *avctx,
203 void *data, int *got_frame,
204 AVPacket *avpkt)
205{
206 const uint8_t *buf = avpkt->data;
207 int buf_size = avpkt->size;
208 int64_t pts = avpkt->pts;
209 SchroTag *tag;
210
211 SchroDecoderParams *p_schro_params = avctx->priv_data;
212 SchroDecoder *decoder = p_schro_params->decoder;
213 SchroBuffer *enc_buf;
214 SchroFrame* frame;
215 AVFrame *avframe = data;
216 int state;
217 int go = 1;
218 int outer = 1;
219 SchroParseUnitContext parse_ctx;
220 LibSchroFrameContext *framewithpts = NULL;
221 int ret;
222
223 *got_frame = 0;
224
225 parse_context_init(&parse_ctx, buf, buf_size);
226 if (!buf_size) {
227 if (!p_schro_params->eos_signalled) {
228 state = schro_decoder_push_end_of_stream(decoder);
229 p_schro_params->eos_signalled = 1;
230 }
231 }
232
233 /* Loop through all the individual parse units in the input buffer */
234 do {
235 if ((enc_buf = find_next_parse_unit(&parse_ctx))) {
236 /* Set Schrotag with the pts to be recovered after decoding*/
237 enc_buf->tag = schro_tag_new(av_malloc(sizeof(int64_t)), av_free);
238 if (!enc_buf->tag->value) {
239 av_log(avctx, AV_LOG_ERROR, "Unable to allocate SchroTag\n");
240 return AVERROR(ENOMEM);
241 }
242 AV_WN(64, enc_buf->tag->value, pts);
243 /* Push buffer into decoder. */
244 if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) &&
245 SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0)
246 avctx->has_b_frames = 1;
247 state = schro_decoder_push(decoder, enc_buf);
248 if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
249 libschroedinger_handle_first_access_unit(avctx);
250 go = 1;
251 } else
252 outer = 0;
253
254 while (go) {
255 /* Parse data and process result. */
256 state = schro_decoder_wait(decoder);
257 switch (state) {
258 case SCHRO_DECODER_FIRST_ACCESS_UNIT:
259 libschroedinger_handle_first_access_unit(avctx);
260 break;
261
262 case SCHRO_DECODER_NEED_BITS:
263 /* Need more input data - stop iterating over what we have. */
264 go = 0;
265 break;
266
267 case SCHRO_DECODER_NEED_FRAME:
268 /* Decoder needs a frame - create one and push it in. */
269 frame = ff_create_schro_frame(avctx,
270 p_schro_params->frame_format);
271 if (!frame)
272 return AVERROR(ENOMEM);
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 tag = schro_decoder_get_picture_tag(decoder);
279 frame = schro_decoder_pull(decoder);
280
281 if (frame) {
282 /* Add relation between schroframe and pts. */
283 framewithpts = av_malloc(sizeof(LibSchroFrameContext));
284 if (!framewithpts) {
285 av_log(avctx, AV_LOG_ERROR, "Unable to allocate FrameWithPts\n");
286 return AVERROR(ENOMEM);
287 }
288 framewithpts->frame = frame;
289 framewithpts->pts = AV_RN64(tag->value);
290 ff_schro_queue_push_back(&p_schro_params->dec_frame_queue,
291 framewithpts);
292 }
293 break;
294 case SCHRO_DECODER_EOS:
295 go = 0;
296 p_schro_params->eos_pulled = 1;
297 schro_decoder_reset(decoder);
298 outer = 0;
299 break;
300
301 case SCHRO_DECODER_ERROR:
302 return -1;
303 break;
304 }
305 }
306 } while (outer);
307
308 /* Grab next frame to be returned from the top of the queue. */
309 framewithpts = ff_schro_queue_pop(&p_schro_params->dec_frame_queue);
310
311 if (framewithpts && framewithpts->frame && framewithpts->frame->components[0].stride) {
312
313 if ((ret = ff_get_buffer(avctx, avframe, 0)) < 0)
314 goto end;
315
316 memcpy(avframe->data[0],
317 framewithpts->frame->components[0].data,
318 framewithpts->frame->components[0].length);
319
320 memcpy(avframe->data[1],
321 framewithpts->frame->components[1].data,
322 framewithpts->frame->components[1].length);
323
324 memcpy(avframe->data[2],
325 framewithpts->frame->components[2].data,
326 framewithpts->frame->components[2].length);
327
328 /* Fill frame with current buffer data from Schroedinger. */
329 avframe->pts = framewithpts->pts;
330#if FF_API_PKT_PTS
331FF_DISABLE_DEPRECATION_WARNINGS
332 avframe->pkt_pts = avframe->pts;
333FF_ENABLE_DEPRECATION_WARNINGS
334#endif
335 avframe->linesize[0] = framewithpts->frame->components[0].stride;
336 avframe->linesize[1] = framewithpts->frame->components[1].stride;
337 avframe->linesize[2] = framewithpts->frame->components[2].stride;
338
339 *got_frame = 1;
340 } else {
341 data = NULL;
342 *got_frame = 0;
343 }
344 ret = buf_size;
345end:
346 /* Now free the frame resources. */
347 if (framewithpts && framewithpts->frame)
348 libschroedinger_decode_frame_free(framewithpts->frame);
349 av_freep(&framewithpts);
350 return ret;
351}
352
353
354static av_cold int libschroedinger_decode_close(AVCodecContext *avctx)
355{
356 SchroDecoderParams *p_schro_params = avctx->priv_data;
357 /* Free the decoder. */
358 schro_decoder_free(p_schro_params->decoder);
359 av_freep(&p_schro_params->format);
360
361 /* Free data in the output frame queue. */
362 ff_schro_queue_free(&p_schro_params->dec_frame_queue,
363 libschroedinger_decode_frame_free);
364
365 return 0;
366}
367
368static void libschroedinger_flush(AVCodecContext *avctx)
369{
370 /* Got a seek request. Free the decoded frames queue and then reset
371 * the decoder */
372 SchroDecoderParams *p_schro_params = avctx->priv_data;
373
374 /* Free data in the output frame queue. */
375 ff_schro_queue_free(&p_schro_params->dec_frame_queue,
376 libschroedinger_decode_frame_free);
377
378 ff_schro_queue_init(&p_schro_params->dec_frame_queue);
379 schro_decoder_reset(p_schro_params->decoder);
380 p_schro_params->eos_pulled = 0;
381 p_schro_params->eos_signalled = 0;
382}
383
384AVCodec ff_libschroedinger_decoder = {
385 .name = "libschroedinger",
386 .long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
387 .type = AVMEDIA_TYPE_VIDEO,
388 .id = AV_CODEC_ID_DIRAC,
389 .priv_data_size = sizeof(SchroDecoderParams),
390 .init = libschroedinger_decode_init,
391 .close = libschroedinger_decode_close,
392 .decode = libschroedinger_decode_frame,
393 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
394 .flush = libschroedinger_flush,
395};
396
generated by cgit at 2024-05-17 04:13:39 (GMT)