Merge remote branch 'qatar/master'
[ffmpeg.git] / libavcodec / libschroedingerdec.c
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 "libavutil/imgutils.h"
31 #include "avcodec.h"
32 #include "libdirac_libschro.h"
33 #include "libschroedinger.h"
34
35 #undef NDEBUG
36 #include <assert.h>
37
38
39 #include <schroedinger/schro.h>
40 #include <schroedinger/schrodebug.h>
41 #include <schroedinger/schrovideoformat.h>
42
43 /** libschroedinger decoder private data */
44 typedef struct FfmpegSchroDecoderParams {
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
67 typedef struct FfmpegSchroParseUnitContext {
68     const uint8_t *buf;
69     int           buf_size;
70 } FfmpegSchroParseUnitContext;
71
72
73 static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
74                                                void *priv);
75
76 static void FfmpegSchroParseContextInit(FfmpegSchroParseUnitContext *parse_ctx,
77                                         const uint8_t *buf, int buf_size)
78 {
79     parse_ctx->buf           = buf;
80     parse_ctx->buf_size      = buf_size;
81 }
82
83 static SchroBuffer* FfmpegFindNextSchroParseUnit(FfmpegSchroParseUnitContext *parse_ctx)
84 {
85     SchroBuffer *enc_buf = NULL;
86     int next_pu_offset = 0;
87     unsigned char *in_buf;
88
89     if (parse_ctx->buf_size < 13 ||
90         parse_ctx->buf[0] != 'B' ||
91         parse_ctx->buf[1] != 'B' ||
92         parse_ctx->buf[2] != 'C' ||
93         parse_ctx->buf[3] != 'D')
94         return NULL;
95
96     next_pu_offset = (parse_ctx->buf[5] << 24) +
97                      (parse_ctx->buf[6] << 16) +
98                      (parse_ctx->buf[7] <<  8) +
99                       parse_ctx->buf[8];
100
101     if (next_pu_offset == 0 &&
102         SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4]))
103         next_pu_offset = 13;
104
105     if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset)
106         return NULL;
107
108     in_buf = av_malloc(next_pu_offset);
109     memcpy(in_buf, parse_ctx->buf, next_pu_offset);
110     enc_buf       = schro_buffer_new_with_data(in_buf, next_pu_offset);
111     enc_buf->free = libschroedinger_decode_buffer_free;
112     enc_buf->priv = in_buf;
113
114     parse_ctx->buf      += next_pu_offset;
115     parse_ctx->buf_size -= next_pu_offset;
116
117     return enc_buf;
118 }
119
120 /**
121 * Returns Libav chroma format.
122 */
123 static enum PixelFormat GetFfmpegChromaFormat(SchroChromaFormat schro_pix_fmt)
124 {
125     int num_formats = sizeof(ffmpeg_schro_pixel_format_map) /
126                       sizeof(ffmpeg_schro_pixel_format_map[0]);
127     int idx;
128
129     for (idx = 0; idx < num_formats; ++idx)
130         if (ffmpeg_schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt)
131             return ffmpeg_schro_pixel_format_map[idx].ff_pix_fmt;
132     return PIX_FMT_NONE;
133 }
134
135 static av_cold int libschroedinger_decode_init(AVCodecContext *avccontext)
136 {
137
138     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
139     /* First of all, initialize our supporting libraries. */
140     schro_init();
141
142     schro_debug_set_level(avccontext->debug);
143     p_schro_params->decoder = schro_decoder_new();
144     schro_decoder_set_skip_ratio(p_schro_params->decoder, 1);
145
146     if (!p_schro_params->decoder)
147         return -1;
148
149     /* Initialize the decoded frame queue. */
150     ff_dirac_schro_queue_init(&p_schro_params->dec_frame_queue);
151     return 0;
152 }
153
154 static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
155                                                void *priv)
156 {
157     av_freep(&priv);
158 }
159
160 static void libschroedinger_decode_frame_free(void *frame)
161 {
162     schro_frame_unref(frame);
163 }
164
165 static void libschroedinger_handle_first_access_unit(AVCodecContext *avccontext)
166 {
167     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
168     SchroDecoder *decoder = p_schro_params->decoder;
169
170     p_schro_params->format = schro_decoder_get_video_format(decoder);
171
172     /* Tell Libav about sequence details. */
173     if (av_image_check_size(p_schro_params->format->width, p_schro_params->format->height,
174                             0, avccontext) < 0) {
175         av_log(avccontext, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n",
176                p_schro_params->format->width, p_schro_params->format->height);
177         avccontext->height = avccontext->width = 0;
178         return;
179     }
180     avccontext->height  = p_schro_params->format->height;
181     avccontext->width   = p_schro_params->format->width;
182     avccontext->pix_fmt = GetFfmpegChromaFormat(p_schro_params->format->chroma_format);
183
184     if (ff_get_schro_frame_format(p_schro_params->format->chroma_format,
185                                   &p_schro_params->frame_format) == -1) {
186         av_log(avccontext, AV_LOG_ERROR,
187                "This codec currently only supports planar YUV 4:2:0, 4:2:2 "
188                "and 4:4:4 formats.\n");
189         return;
190     }
191
192     avccontext->time_base.den = p_schro_params->format->frame_rate_numerator;
193     avccontext->time_base.num = p_schro_params->format->frame_rate_denominator;
194
195     if (!p_schro_params->dec_pic.data[0])
196         avpicture_alloc(&p_schro_params->dec_pic,
197                         avccontext->pix_fmt,
198                         avccontext->width,
199                         avccontext->height);
200 }
201
202 static int libschroedinger_decode_frame(AVCodecContext *avccontext,
203                                         void *data, int *data_size,
204                                         AVPacket *avpkt)
205 {
206     const uint8_t *buf = avpkt->data;
207     int buf_size = avpkt->size;
208
209     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
210     SchroDecoder *decoder = p_schro_params->decoder;
211     SchroVideoFormat *format;
212     AVPicture *picture = data;
213     SchroBuffer *enc_buf;
214     SchroFrame* frame;
215     int state;
216     int go = 1;
217     int outer = 1;
218     FfmpegSchroParseUnitContext parse_ctx;
219
220     *data_size = 0;
221
222     FfmpegSchroParseContextInit(&parse_ctx, buf, buf_size);
223     if (!buf_size) {
224         if (!p_schro_params->eos_signalled) {
225             state = schro_decoder_push_end_of_stream(decoder);
226             p_schro_params->eos_signalled = 1;
227         }
228     }
229
230     /* Loop through all the individual parse units in the input buffer */
231     do {
232         if ((enc_buf = FfmpegFindNextSchroParseUnit(&parse_ctx))) {
233             /* Push buffer into decoder. */
234             if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) &&
235                 SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0)
236                 avccontext->has_b_frames = 1;
237             state = schro_decoder_push(decoder, enc_buf);
238             if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
239                 libschroedinger_handle_first_access_unit(avccontext);
240             go = 1;
241         } else
242             outer = 0;
243         format = p_schro_params->format;
244
245         while (go) {
246             /* Parse data and process result. */
247             state = schro_decoder_wait(decoder);
248             switch (state) {
249             case SCHRO_DECODER_FIRST_ACCESS_UNIT:
250                 libschroedinger_handle_first_access_unit(avccontext);
251                 break;
252
253             case SCHRO_DECODER_NEED_BITS:
254                 /* Need more input data - stop iterating over what we have. */
255                 go = 0;
256                 break;
257
258             case SCHRO_DECODER_NEED_FRAME:
259                 /* Decoder needs a frame - create one and push it in. */
260                 frame = ff_create_schro_frame(avccontext,
261                                               p_schro_params->frame_format);
262                 schro_decoder_add_output_picture(decoder, frame);
263                 break;
264
265             case SCHRO_DECODER_OK:
266                 /* Pull a frame out of the decoder. */
267                 frame = schro_decoder_pull(decoder);
268
269                 if (frame)
270                     ff_dirac_schro_queue_push_back(&p_schro_params->dec_frame_queue,
271                                                    frame);
272                 break;
273             case SCHRO_DECODER_EOS:
274                 go = 0;
275                 p_schro_params->eos_pulled = 1;
276                 schro_decoder_reset(decoder);
277                 outer = 0;
278                 break;
279
280             case SCHRO_DECODER_ERROR:
281                 return -1;
282                 break;
283             }
284         }
285     } while (outer);
286
287     /* Grab next frame to be returned from the top of the queue. */
288     frame = ff_dirac_schro_queue_pop(&p_schro_params->dec_frame_queue);
289
290     if (frame) {
291         memcpy(p_schro_params->dec_pic.data[0],
292                frame->components[0].data,
293                frame->components[0].length);
294
295         memcpy(p_schro_params->dec_pic.data[1],
296                frame->components[1].data,
297                frame->components[1].length);
298
299         memcpy(p_schro_params->dec_pic.data[2],
300                frame->components[2].data,
301                frame->components[2].length);
302
303         /* Fill picture with current buffer data from Schroedinger. */
304         avpicture_fill(picture, p_schro_params->dec_pic.data[0],
305                        avccontext->pix_fmt,
306                        avccontext->width, avccontext->height);
307
308         *data_size = sizeof(AVPicture);
309
310         /* Now free the frame resources. */
311         libschroedinger_decode_frame_free(frame);
312     }
313     return buf_size;
314 }
315
316
317 static av_cold int libschroedinger_decode_close(AVCodecContext *avccontext)
318 {
319     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
320     /* Free the decoder. */
321     schro_decoder_free(p_schro_params->decoder);
322     av_freep(&p_schro_params->format);
323
324     avpicture_free(&p_schro_params->dec_pic);
325
326     /* Free data in the output frame queue. */
327     ff_dirac_schro_queue_free(&p_schro_params->dec_frame_queue,
328                               libschroedinger_decode_frame_free);
329
330     return 0;
331 }
332
333 static void libschroedinger_flush(AVCodecContext *avccontext)
334 {
335     /* Got a seek request. Free the decoded frames queue and then reset
336      * the decoder */
337     FfmpegSchroDecoderParams *p_schro_params = avccontext->priv_data;
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     ff_dirac_schro_queue_init(&p_schro_params->dec_frame_queue);
344     schro_decoder_reset(p_schro_params->decoder);
345     p_schro_params->eos_pulled = 0;
346     p_schro_params->eos_signalled = 0;
347 }
348
349 AVCodec ff_libschroedinger_decoder = {
350     "libschroedinger",
351     AVMEDIA_TYPE_VIDEO,
352     CODEC_ID_DIRAC,
353     sizeof(FfmpegSchroDecoderParams),
354     libschroedinger_decode_init,
355     NULL,
356     libschroedinger_decode_close,
357     libschroedinger_decode_frame,
358     CODEC_CAP_DELAY,
359     .flush = libschroedinger_flush,
360     .long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
361 };