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/libavformat/swfenc.c

http://github.com/FFmpeg/FFmpeg
C | 545 lines | 420 code | 73 blank | 52 comment | 80 complexity | 2fe432c46ada06f665be272d7ed8c1e4 MD5 | raw file
  1/*
  2 * Flash Compatible Streaming Format muxer
  3 * Copyright (c) 2000 Fabrice Bellard
  4 * Copyright (c) 2003 Tinic Uro
  5 *
  6 * This file is part of FFmpeg.
  7 *
  8 * FFmpeg is free software; you can redistribute it and/or
  9 * modify it under the terms of the GNU Lesser General Public
 10 * License as published by the Free Software Foundation; either
 11 * version 2.1 of the License, or (at your option) any later version.
 12 *
 13 * FFmpeg is distributed in the hope that it will be useful,
 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 16 * Lesser General Public License for more details.
 17 *
 18 * You should have received a copy of the GNU Lesser General Public
 19 * License along with FFmpeg; if not, write to the Free Software
 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 21 */
 22
 23#include "libavcodec/put_bits.h"
 24#include "libavutil/avassert.h"
 25#include "avformat.h"
 26#include "swf.h"
 27
 28static void put_swf_tag(AVFormatContext *s, int tag)
 29{
 30    SWFContext *swf = s->priv_data;
 31    AVIOContext *pb = s->pb;
 32
 33    swf->tag_pos = avio_tell(pb);
 34    swf->tag = tag;
 35    /* reserve some room for the tag */
 36    if (tag & TAG_LONG) {
 37        avio_wl16(pb, 0);
 38        avio_wl32(pb, 0);
 39    } else {
 40        avio_wl16(pb, 0);
 41    }
 42}
 43
 44static void put_swf_end_tag(AVFormatContext *s)
 45{
 46    SWFContext *swf = s->priv_data;
 47    AVIOContext *pb = s->pb;
 48    int64_t pos;
 49    int tag_len, tag;
 50
 51    pos = avio_tell(pb);
 52    tag_len = pos - swf->tag_pos - 2;
 53    tag = swf->tag;
 54    avio_seek(pb, swf->tag_pos, SEEK_SET);
 55    if (tag & TAG_LONG) {
 56        tag &= ~TAG_LONG;
 57        avio_wl16(pb, (tag << 6) | 0x3f);
 58        avio_wl32(pb, tag_len - 4);
 59    } else {
 60        av_assert0(tag_len < 0x3f);
 61        avio_wl16(pb, (tag << 6) | tag_len);
 62    }
 63    avio_seek(pb, pos, SEEK_SET);
 64}
 65
 66static inline void max_nbits(int *nbits_ptr, int val)
 67{
 68    int n;
 69
 70    if (val == 0)
 71        return;
 72    val = FFABS(val);
 73    n = 1;
 74    while (val != 0) {
 75        n++;
 76        val >>= 1;
 77    }
 78    if (n > *nbits_ptr)
 79        *nbits_ptr = n;
 80}
 81
 82static void put_swf_rect(AVIOContext *pb,
 83                         int xmin, int xmax, int ymin, int ymax)
 84{
 85    PutBitContext p;
 86    uint8_t buf[256];
 87    int nbits, mask;
 88
 89    init_put_bits(&p, buf, sizeof(buf));
 90
 91    nbits = 0;
 92    max_nbits(&nbits, xmin);
 93    max_nbits(&nbits, xmax);
 94    max_nbits(&nbits, ymin);
 95    max_nbits(&nbits, ymax);
 96    mask = (1 << nbits) - 1;
 97
 98    /* rectangle info */
 99    put_bits(&p, 5, nbits);
100    put_bits(&p, nbits, xmin & mask);
101    put_bits(&p, nbits, xmax & mask);
102    put_bits(&p, nbits, ymin & mask);
103    put_bits(&p, nbits, ymax & mask);
104
105    flush_put_bits(&p);
106    avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
107}
108
109static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
110{
111    int nbits, mask;
112
113    put_bits(pb, 1, 1); /* edge */
114    put_bits(pb, 1, 1); /* line select */
115    nbits = 2;
116    max_nbits(&nbits, dx);
117    max_nbits(&nbits, dy);
118
119    mask = (1 << nbits) - 1;
120    put_bits(pb, 4, nbits - 2); /* 16 bits precision */
121    if (dx == 0) {
122        put_bits(pb, 1, 0);
123        put_bits(pb, 1, 1);
124        put_bits(pb, nbits, dy & mask);
125    } else if (dy == 0) {
126        put_bits(pb, 1, 0);
127        put_bits(pb, 1, 0);
128        put_bits(pb, nbits, dx & mask);
129    } else {
130        put_bits(pb, 1, 1);
131        put_bits(pb, nbits, dx & mask);
132        put_bits(pb, nbits, dy & mask);
133    }
134}
135
136#define FRAC_BITS 16
137
138static void put_swf_matrix(AVIOContext *pb,
139                           int a, int b, int c, int d, int tx, int ty)
140{
141    PutBitContext p;
142    uint8_t buf[256];
143    int nbits;
144
145    init_put_bits(&p, buf, sizeof(buf));
146
147    put_bits(&p, 1, 1); /* a, d present */
148    nbits = 1;
149    max_nbits(&nbits, a);
150    max_nbits(&nbits, d);
151    put_bits(&p, 5, nbits); /* nb bits */
152    put_bits(&p, nbits, a);
153    put_bits(&p, nbits, d);
154
155    put_bits(&p, 1, 1); /* b, c present */
156    nbits = 1;
157    max_nbits(&nbits, c);
158    max_nbits(&nbits, b);
159    put_bits(&p, 5, nbits); /* nb bits */
160    put_bits(&p, nbits, c);
161    put_bits(&p, nbits, b);
162
163    nbits = 1;
164    max_nbits(&nbits, tx);
165    max_nbits(&nbits, ty);
166    put_bits(&p, 5, nbits); /* nb bits */
167    put_bits(&p, nbits, tx);
168    put_bits(&p, nbits, ty);
169
170    flush_put_bits(&p);
171    avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
172}
173
174static int swf_write_header(AVFormatContext *s)
175{
176    SWFContext *swf = s->priv_data;
177    AVIOContext *pb = s->pb;
178    PutBitContext p;
179    uint8_t buf1[256];
180    int i, width, height, rate, rate_base;
181    int version;
182
183    swf->sound_samples = 0;
184    swf->swf_frame_number = 0;
185    swf->video_frame_number = 0;
186
187    for(i=0;i<s->nb_streams;i++) {
188        AVCodecParameters *par = s->streams[i]->codecpar;
189        if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
190            if (swf->audio_par) {
191                av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n");
192                return AVERROR_INVALIDDATA;
193            }
194            if (par->codec_id == AV_CODEC_ID_MP3) {
195                swf->audio_par = par;
196                swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE);
197                if (!swf->audio_fifo)
198                    return AVERROR(ENOMEM);
199            } else {
200                av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
201                return -1;
202            }
203        } else {
204            if (swf->video_par) {
205                av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n");
206                return AVERROR_INVALIDDATA;
207            }
208            if (par->codec_id == AV_CODEC_ID_VP6F ||
209                par->codec_id == AV_CODEC_ID_FLV1 ||
210                par->codec_id == AV_CODEC_ID_MJPEG) {
211                swf->video_st  = s->streams[i];
212                swf->video_par = par;
213            } else {
214                av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
215                return -1;
216            }
217        }
218    }
219
220    if (!swf->video_par) {
221        /* currently, cannot work correctly if audio only */
222        width = 320;
223        height = 200;
224        rate = 10;
225        rate_base= 1;
226    } else {
227        width = swf->video_par->width;
228        height = swf->video_par->height;
229        // TODO: should be avg_frame_rate
230        rate = swf->video_st->time_base.den;
231        rate_base = swf->video_st->time_base.num;
232    }
233
234    if (!swf->audio_par)
235        swf->samples_per_frame = (44100LL * rate_base) / rate;
236    else
237        swf->samples_per_frame = (swf->audio_par->sample_rate * rate_base) / rate;
238
239    avio_write(pb, "FWS", 3);
240
241    if (!strcmp("avm2", s->oformat->name))
242        version = 9;
243    else if (swf->video_par && swf->video_par->codec_id == AV_CODEC_ID_VP6F)
244        version = 8; /* version 8 and above support VP6 codec */
245    else if (swf->video_par && swf->video_par->codec_id == AV_CODEC_ID_FLV1)
246        version = 6; /* version 6 and above support FLV1 codec */
247    else
248        version = 4; /* version 4 for mpeg audio support */
249    avio_w8(pb, version);
250
251    avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
252                                      (will be patched if not streamed) */
253
254    put_swf_rect(pb, 0, width * 20, 0, height * 20);
255    if ((rate * 256LL) / rate_base >= (1<<16)) {
256        av_log(s, AV_LOG_ERROR, "Invalid (too large) frame rate %d/%d\n", rate, rate_base);
257        return AVERROR(EINVAL);
258    }
259    avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
260    swf->duration_pos = avio_tell(pb);
261    avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
262
263    /* avm2/swf v9 (also v8?) files require a file attribute tag */
264    if (version == 9) {
265        put_swf_tag(s, TAG_FILEATTRIBUTES);
266        avio_wl32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
267        put_swf_end_tag(s);
268    }
269
270    /* define a shape with the jpeg inside */
271    if (swf->video_par && swf->video_par->codec_id == AV_CODEC_ID_MJPEG) {
272        put_swf_tag(s, TAG_DEFINESHAPE);
273
274        avio_wl16(pb, SHAPE_ID); /* ID of shape */
275        /* bounding rectangle */
276        put_swf_rect(pb, 0, width, 0, height);
277        /* style info */
278        avio_w8(pb, 1); /* one fill style */
279        avio_w8(pb, 0x41); /* clipped bitmap fill */
280        avio_wl16(pb, BITMAP_ID); /* bitmap ID */
281        /* position of the bitmap */
282        put_swf_matrix(pb, 1 << FRAC_BITS, 0,
283                       0,  1 << FRAC_BITS, 0, 0);
284        avio_w8(pb, 0); /* no line style */
285
286        /* shape drawing */
287        init_put_bits(&p, buf1, sizeof(buf1));
288        put_bits(&p, 4, 1); /* one fill bit */
289        put_bits(&p, 4, 0); /* zero line bit */
290
291        put_bits(&p, 1, 0); /* not an edge */
292        put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
293        put_bits(&p, 5, 1); /* nbits */
294        put_bits(&p, 1, 0); /* X */
295        put_bits(&p, 1, 0); /* Y */
296        put_bits(&p, 1, 1); /* set fill style 1 */
297
298        /* draw the rectangle ! */
299        put_swf_line_edge(&p, width, 0);
300        put_swf_line_edge(&p, 0, height);
301        put_swf_line_edge(&p, -width, 0);
302        put_swf_line_edge(&p, 0, -height);
303
304        /* end of shape */
305        put_bits(&p, 1, 0); /* not an edge */
306        put_bits(&p, 5, 0);
307
308        flush_put_bits(&p);
309        avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
310
311        put_swf_end_tag(s);
312    }
313
314    if (swf->audio_par && swf->audio_par->codec_id == AV_CODEC_ID_MP3) {
315        int v = 0;
316
317        /* start sound */
318        put_swf_tag(s, TAG_STREAMHEAD2);
319        switch(swf->audio_par->sample_rate) {
320        case 11025: v |= 1 << 2; break;
321        case 22050: v |= 2 << 2; break;
322        case 44100: v |= 3 << 2; break;
323        default:
324            /* not supported */
325            av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
326            return -1;
327        }
328        v |= 0x02; /* 16 bit playback */
329        if (swf->audio_par->channels == 2)
330            v |= 0x01; /* stereo playback */
331        avio_w8(s->pb, v);
332        v |= 0x20; /* mp3 compressed */
333        avio_w8(s->pb, v);
334        avio_wl16(s->pb, swf->samples_per_frame);  /* avg samples per frame */
335        avio_wl16(s->pb, 0);
336
337        put_swf_end_tag(s);
338    }
339
340    return 0;
341}
342
343static int swf_write_video(AVFormatContext *s,
344                           AVCodecParameters *par, const uint8_t *buf, int size)
345{
346    SWFContext *swf = s->priv_data;
347    AVIOContext *pb = s->pb;
348
349    /* Flash Player limit */
350    if (swf->swf_frame_number == 16000)
351        av_log(s, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
352
353    if (par->codec_id == AV_CODEC_ID_VP6F ||
354        par->codec_id == AV_CODEC_ID_FLV1) {
355        if (swf->video_frame_number == 0) {
356            /* create a new video object */
357            put_swf_tag(s, TAG_VIDEOSTREAM);
358            avio_wl16(pb, VIDEO_ID);
359            swf->vframes_pos = avio_tell(pb);
360            avio_wl16(pb, 15000); /* hard flash player limit */
361            avio_wl16(pb, par->width);
362            avio_wl16(pb, par->height);
363            avio_w8(pb, 0);
364            avio_w8(pb,ff_codec_get_tag(ff_swf_codec_tags, par->codec_id));
365            put_swf_end_tag(s);
366
367            /* place the video object for the first time */
368            put_swf_tag(s, TAG_PLACEOBJECT2);
369            avio_w8(pb, 0x36);
370            avio_wl16(pb, 1);
371            avio_wl16(pb, VIDEO_ID);
372            put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
373            avio_wl16(pb, swf->video_frame_number);
374            avio_write(pb, "video", 5);
375            avio_w8(pb, 0x00);
376            put_swf_end_tag(s);
377        } else {
378            /* mark the character for update */
379            put_swf_tag(s, TAG_PLACEOBJECT2);
380            avio_w8(pb, 0x11);
381            avio_wl16(pb, 1);
382            avio_wl16(pb, swf->video_frame_number);
383            put_swf_end_tag(s);
384        }
385
386        /* set video frame data */
387        put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
388        avio_wl16(pb, VIDEO_ID);
389        avio_wl16(pb, swf->video_frame_number++);
390        avio_write(pb, buf, size);
391        put_swf_end_tag(s);
392    } else if (par->codec_id == AV_CODEC_ID_MJPEG) {
393        if (swf->swf_frame_number > 0) {
394            /* remove the shape */
395            put_swf_tag(s, TAG_REMOVEOBJECT);
396            avio_wl16(pb, SHAPE_ID); /* shape ID */
397            avio_wl16(pb, 1); /* depth */
398            put_swf_end_tag(s);
399
400            /* free the bitmap */
401            put_swf_tag(s, TAG_FREECHARACTER);
402            avio_wl16(pb, BITMAP_ID);
403            put_swf_end_tag(s);
404        }
405
406        put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
407
408        avio_wl16(pb, BITMAP_ID); /* ID of the image */
409
410        /* a dummy jpeg header seems to be required */
411        avio_wb32(pb, 0xffd8ffd9);
412        /* write the jpeg image */
413        avio_write(pb, buf, size);
414
415        put_swf_end_tag(s);
416
417        /* draw the shape */
418
419        put_swf_tag(s, TAG_PLACEOBJECT);
420        avio_wl16(pb, SHAPE_ID); /* shape ID */
421        avio_wl16(pb, 1); /* depth */
422        put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
423        put_swf_end_tag(s);
424    }
425
426    swf->swf_frame_number++;
427
428    /* streaming sound always should be placed just before showframe tags */
429    if (swf->audio_par && av_fifo_size(swf->audio_fifo)) {
430        int frame_size = av_fifo_size(swf->audio_fifo);
431        put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
432        avio_wl16(pb, swf->sound_samples);
433        avio_wl16(pb, 0); // seek samples
434        av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write);
435        put_swf_end_tag(s);
436
437        /* update FIFO */
438        swf->sound_samples = 0;
439    }
440
441    /* output the frame */
442    put_swf_tag(s, TAG_SHOWFRAME);
443    put_swf_end_tag(s);
444
445    return 0;
446}
447
448static int swf_write_audio(AVFormatContext *s,
449                           AVCodecParameters *par, uint8_t *buf, int size)
450{
451    SWFContext *swf = s->priv_data;
452
453    /* Flash Player limit */
454    if (swf->swf_frame_number == 16000)
455        av_log(s, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
456
457    if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) {
458        av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
459        return -1;
460    }
461
462    av_fifo_generic_write(swf->audio_fifo, buf, size, NULL);
463    swf->sound_samples += av_get_audio_frame_duration2(par, size);
464
465    /* if audio only stream make sure we add swf frames */
466    if (!swf->video_par)
467        swf_write_video(s, par, 0, 0);
468
469    return 0;
470}
471
472static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
473{
474    AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
475    if (par->codec_type == AVMEDIA_TYPE_AUDIO)
476        return swf_write_audio(s, par, pkt->data, pkt->size);
477    else
478        return swf_write_video(s, par, pkt->data, pkt->size);
479}
480
481static int swf_write_trailer(AVFormatContext *s)
482{
483    SWFContext *swf = s->priv_data;
484    AVIOContext *pb = s->pb;
485    AVCodecParameters *par, *video_par;
486    int file_size, i;
487
488    video_par = NULL;
489    for(i=0;i<s->nb_streams;i++) {
490        par = s->streams[i]->codecpar;
491        if (par->codec_type == AVMEDIA_TYPE_VIDEO)
492            video_par = par;
493        else {
494            av_fifo_freep(&swf->audio_fifo);
495        }
496    }
497
498    put_swf_tag(s, TAG_END);
499    put_swf_end_tag(s);
500
501    /* patch file size and number of frames if not streamed */
502    if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && video_par) {
503        file_size = avio_tell(pb);
504        avio_seek(pb, 4, SEEK_SET);
505        avio_wl32(pb, file_size);
506        avio_seek(pb, swf->duration_pos, SEEK_SET);
507        avio_wl16(pb, swf->video_frame_number);
508        if (swf->vframes_pos) {
509        avio_seek(pb, swf->vframes_pos, SEEK_SET);
510        avio_wl16(pb, swf->video_frame_number);
511        }
512        avio_seek(pb, file_size, SEEK_SET);
513    }
514    return 0;
515}
516
517#if CONFIG_SWF_MUXER
518AVOutputFormat ff_swf_muxer = {
519    .name              = "swf",
520    .long_name         = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
521    .mime_type         = "application/x-shockwave-flash",
522    .extensions        = "swf",
523    .priv_data_size    = sizeof(SWFContext),
524    .audio_codec       = AV_CODEC_ID_MP3,
525    .video_codec       = AV_CODEC_ID_FLV1,
526    .write_header      = swf_write_header,
527    .write_packet      = swf_write_packet,
528    .write_trailer     = swf_write_trailer,
529    .flags             = AVFMT_TS_NONSTRICT,
530};
531#endif
532#if CONFIG_AVM2_MUXER
533AVOutputFormat ff_avm2_muxer = {
534    .name              = "avm2",
535    .long_name         = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"),
536    .mime_type         = "application/x-shockwave-flash",
537    .priv_data_size    = sizeof(SWFContext),
538    .audio_codec       = AV_CODEC_ID_MP3,
539    .video_codec       = AV_CODEC_ID_FLV1,
540    .write_header      = swf_write_header,
541    .write_packet      = swf_write_packet,
542    .write_trailer     = swf_write_trailer,
543    .flags             = AVFMT_TS_NONSTRICT,
544};
545#endif