diff options
Diffstat (limited to 'ffmpeg/libavformat/swfenc.c')
| -rw-r--r-- | ffmpeg/libavformat/swfenc.c | 547 |
1 files changed, 547 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/swfenc.c b/ffmpeg/libavformat/swfenc.c new file mode 100644 index 0000000..5b7fd1f --- /dev/null +++ b/ffmpeg/libavformat/swfenc.c @@ -0,0 +1,547 @@ +/* + * Flash Compatible Streaming Format muxer + * Copyright (c) 2000 Fabrice Bellard + * Copyright (c) 2003 Tinic Uro + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavcodec/put_bits.h" +#include "libavutil/avassert.h" +#include "avformat.h" +#include "swf.h" + +static void put_swf_tag(AVFormatContext *s, int tag) +{ + SWFContext *swf = s->priv_data; + AVIOContext *pb = s->pb; + + swf->tag_pos = avio_tell(pb); + swf->tag = tag; + /* reserve some room for the tag */ + if (tag & TAG_LONG) { + avio_wl16(pb, 0); + avio_wl32(pb, 0); + } else { + avio_wl16(pb, 0); + } +} + +static void put_swf_end_tag(AVFormatContext *s) +{ + SWFContext *swf = s->priv_data; + AVIOContext *pb = s->pb; + int64_t pos; + int tag_len, tag; + + pos = avio_tell(pb); + tag_len = pos - swf->tag_pos - 2; + tag = swf->tag; + avio_seek(pb, swf->tag_pos, SEEK_SET); + if (tag & TAG_LONG) { + tag &= ~TAG_LONG; + avio_wl16(pb, (tag << 6) | 0x3f); + avio_wl32(pb, tag_len - 4); + } else { + av_assert0(tag_len < 0x3f); + avio_wl16(pb, (tag << 6) | tag_len); + } + avio_seek(pb, pos, SEEK_SET); +} + +static inline void max_nbits(int *nbits_ptr, int val) +{ + int n; + + if (val == 0) + return; + val = abs(val); + n = 1; + while (val != 0) { + n++; + val >>= 1; + } + if (n > *nbits_ptr) + *nbits_ptr = n; +} + +static void put_swf_rect(AVIOContext *pb, + int xmin, int xmax, int ymin, int ymax) +{ + PutBitContext p; + uint8_t buf[256]; + int nbits, mask; + + init_put_bits(&p, buf, sizeof(buf)); + + nbits = 0; + max_nbits(&nbits, xmin); + max_nbits(&nbits, xmax); + max_nbits(&nbits, ymin); + max_nbits(&nbits, ymax); + mask = (1 << nbits) - 1; + + /* rectangle info */ + put_bits(&p, 5, nbits); + put_bits(&p, nbits, xmin & mask); + put_bits(&p, nbits, xmax & mask); + put_bits(&p, nbits, ymin & mask); + put_bits(&p, nbits, ymax & mask); + + flush_put_bits(&p); + avio_write(pb, buf, put_bits_ptr(&p) - p.buf); +} + +static void put_swf_line_edge(PutBitContext *pb, int dx, int dy) +{ + int nbits, mask; + + put_bits(pb, 1, 1); /* edge */ + put_bits(pb, 1, 1); /* line select */ + nbits = 2; + max_nbits(&nbits, dx); + max_nbits(&nbits, dy); + + mask = (1 << nbits) - 1; + put_bits(pb, 4, nbits - 2); /* 16 bits precision */ + if (dx == 0) { + put_bits(pb, 1, 0); + put_bits(pb, 1, 1); + put_bits(pb, nbits, dy & mask); + } else if (dy == 0) { + put_bits(pb, 1, 0); + put_bits(pb, 1, 0); + put_bits(pb, nbits, dx & mask); + } else { + put_bits(pb, 1, 1); + put_bits(pb, nbits, dx & mask); + put_bits(pb, nbits, dy & mask); + } +} + +#define FRAC_BITS 16 + +static void put_swf_matrix(AVIOContext *pb, + int a, int b, int c, int d, int tx, int ty) +{ + PutBitContext p; + uint8_t buf[256]; + int nbits; + + init_put_bits(&p, buf, sizeof(buf)); + + put_bits(&p, 1, 1); /* a, d present */ + nbits = 1; + max_nbits(&nbits, a); + max_nbits(&nbits, d); + put_bits(&p, 5, nbits); /* nb bits */ + put_bits(&p, nbits, a); + put_bits(&p, nbits, d); + + put_bits(&p, 1, 1); /* b, c present */ + nbits = 1; + max_nbits(&nbits, c); + max_nbits(&nbits, b); + put_bits(&p, 5, nbits); /* nb bits */ + put_bits(&p, nbits, c); + put_bits(&p, nbits, b); + + nbits = 1; + max_nbits(&nbits, tx); + max_nbits(&nbits, ty); + put_bits(&p, 5, nbits); /* nb bits */ + put_bits(&p, nbits, tx); + put_bits(&p, nbits, ty); + + flush_put_bits(&p); + avio_write(pb, buf, put_bits_ptr(&p) - p.buf); +} + +static int swf_write_header(AVFormatContext *s) +{ + SWFContext *swf = s->priv_data; + AVIOContext *pb = s->pb; + PutBitContext p; + uint8_t buf1[256]; + int i, width, height, rate, rate_base; + int version; + + swf->sound_samples = 0; + swf->swf_frame_number = 0; + swf->video_frame_number = 0; + + for(i=0;i<s->nb_streams;i++) { + AVCodecContext *enc = s->streams[i]->codec; + if (enc->codec_type == AVMEDIA_TYPE_AUDIO) { + if (swf->audio_enc) { + av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n"); + return AVERROR_INVALIDDATA; + } + if (enc->codec_id == AV_CODEC_ID_MP3) { + if (!enc->frame_size) { + av_log(s, AV_LOG_ERROR, "audio frame size not set\n"); + return -1; + } + swf->audio_enc = enc; + swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE); + if (!swf->audio_fifo) + return AVERROR(ENOMEM); + } else { + av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n"); + return -1; + } + } else { + if (swf->video_enc) { + av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n"); + return AVERROR_INVALIDDATA; + } + if (enc->codec_id == AV_CODEC_ID_VP6F || + enc->codec_id == AV_CODEC_ID_FLV1 || + enc->codec_id == AV_CODEC_ID_MJPEG) { + swf->video_enc = enc; + } else { + av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n"); + return -1; + } + } + } + + if (!swf->video_enc) { + /* currently, cannot work correctly if audio only */ + width = 320; + height = 200; + rate = 10; + rate_base= 1; + } else { + width = swf->video_enc->width; + height = swf->video_enc->height; + rate = swf->video_enc->time_base.den; + rate_base = swf->video_enc->time_base.num; + } + + if (!swf->audio_enc) + swf->samples_per_frame = (44100. * rate_base) / rate; + else + swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate; + + avio_write(pb, "FWS", 3); + + if (!strcmp("avm2", s->oformat->name)) + version = 9; + else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_VP6F) + version = 8; /* version 8 and above support VP6 codec */ + else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_FLV1) + version = 6; /* version 6 and above support FLV1 codec */ + else + version = 4; /* version 4 for mpeg audio support */ + avio_w8(pb, version); + + avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size + (will be patched if not streamed) */ + + put_swf_rect(pb, 0, width * 20, 0, height * 20); + avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */ + swf->duration_pos = avio_tell(pb); + avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */ + + /* avm2/swf v9 (also v8?) files require a file attribute tag */ + if (version == 9) { + put_swf_tag(s, TAG_FILEATTRIBUTES); + avio_wl32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */ + put_swf_end_tag(s); + } + + /* define a shape with the jpeg inside */ + if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_MJPEG) { + put_swf_tag(s, TAG_DEFINESHAPE); + + avio_wl16(pb, SHAPE_ID); /* ID of shape */ + /* bounding rectangle */ + put_swf_rect(pb, 0, width, 0, height); + /* style info */ + avio_w8(pb, 1); /* one fill style */ + avio_w8(pb, 0x41); /* clipped bitmap fill */ + avio_wl16(pb, BITMAP_ID); /* bitmap ID */ + /* position of the bitmap */ + put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0, + 0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0); + avio_w8(pb, 0); /* no line style */ + + /* shape drawing */ + init_put_bits(&p, buf1, sizeof(buf1)); + put_bits(&p, 4, 1); /* one fill bit */ + put_bits(&p, 4, 0); /* zero line bit */ + + put_bits(&p, 1, 0); /* not an edge */ + put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0); + put_bits(&p, 5, 1); /* nbits */ + put_bits(&p, 1, 0); /* X */ + put_bits(&p, 1, 0); /* Y */ + put_bits(&p, 1, 1); /* set fill style 1 */ + + /* draw the rectangle ! */ + put_swf_line_edge(&p, width, 0); + put_swf_line_edge(&p, 0, height); + put_swf_line_edge(&p, -width, 0); + put_swf_line_edge(&p, 0, -height); + + /* end of shape */ + put_bits(&p, 1, 0); /* not an edge */ + put_bits(&p, 5, 0); + + flush_put_bits(&p); + avio_write(pb, buf1, put_bits_ptr(&p) - p.buf); + + put_swf_end_tag(s); + } + + if (swf->audio_enc && swf->audio_enc->codec_id == AV_CODEC_ID_MP3) { + int v = 0; + + /* start sound */ + put_swf_tag(s, TAG_STREAMHEAD2); + switch(swf->audio_enc->sample_rate) { + case 11025: v |= 1 << 2; break; + case 22050: v |= 2 << 2; break; + case 44100: v |= 3 << 2; break; + default: + /* not supported */ + av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n"); + return -1; + } + v |= 0x02; /* 16 bit playback */ + if (swf->audio_enc->channels == 2) + v |= 0x01; /* stereo playback */ + avio_w8(s->pb, v); + v |= 0x20; /* mp3 compressed */ + avio_w8(s->pb, v); + avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */ + avio_wl16(s->pb, 0); + + put_swf_end_tag(s); + } + + avio_flush(s->pb); + return 0; +} + +static int swf_write_video(AVFormatContext *s, + AVCodecContext *enc, const uint8_t *buf, int size) +{ + SWFContext *swf = s->priv_data; + AVIOContext *pb = s->pb; + + /* Flash Player limit */ + if (swf->swf_frame_number == 16000) + av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n"); + + if (enc->codec_id == AV_CODEC_ID_VP6F || + enc->codec_id == AV_CODEC_ID_FLV1) { + if (swf->video_frame_number == 0) { + /* create a new video object */ + put_swf_tag(s, TAG_VIDEOSTREAM); + avio_wl16(pb, VIDEO_ID); + swf->vframes_pos = avio_tell(pb); + avio_wl16(pb, 15000); /* hard flash player limit */ + avio_wl16(pb, enc->width); + avio_wl16(pb, enc->height); + avio_w8(pb, 0); + avio_w8(pb,ff_codec_get_tag(ff_swf_codec_tags, enc->codec_id)); + put_swf_end_tag(s); + + /* place the video object for the first time */ + put_swf_tag(s, TAG_PLACEOBJECT2); + avio_w8(pb, 0x36); + avio_wl16(pb, 1); + avio_wl16(pb, VIDEO_ID); + put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0); + avio_wl16(pb, swf->video_frame_number); + avio_write(pb, "video", 5); + avio_w8(pb, 0x00); + put_swf_end_tag(s); + } else { + /* mark the character for update */ + put_swf_tag(s, TAG_PLACEOBJECT2); + avio_w8(pb, 0x11); + avio_wl16(pb, 1); + avio_wl16(pb, swf->video_frame_number); + put_swf_end_tag(s); + } + + /* set video frame data */ + put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG); + avio_wl16(pb, VIDEO_ID); + avio_wl16(pb, swf->video_frame_number++); + avio_write(pb, buf, size); + put_swf_end_tag(s); + } else if (enc->codec_id == AV_CODEC_ID_MJPEG) { + if (swf->swf_frame_number > 0) { + /* remove the shape */ + put_swf_tag(s, TAG_REMOVEOBJECT); + avio_wl16(pb, SHAPE_ID); /* shape ID */ + avio_wl16(pb, 1); /* depth */ + put_swf_end_tag(s); + + /* free the bitmap */ + put_swf_tag(s, TAG_FREECHARACTER); + avio_wl16(pb, BITMAP_ID); + put_swf_end_tag(s); + } + + put_swf_tag(s, TAG_JPEG2 | TAG_LONG); + + avio_wl16(pb, BITMAP_ID); /* ID of the image */ + + /* a dummy jpeg header seems to be required */ + avio_wb32(pb, 0xffd8ffd9); + /* write the jpeg image */ + avio_write(pb, buf, size); + + put_swf_end_tag(s); + + /* draw the shape */ + + put_swf_tag(s, TAG_PLACEOBJECT); + avio_wl16(pb, SHAPE_ID); /* shape ID */ + avio_wl16(pb, 1); /* depth */ + put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0); + put_swf_end_tag(s); + } + + swf->swf_frame_number++; + + /* streaming sound always should be placed just before showframe tags */ + if (swf->audio_enc && av_fifo_size(swf->audio_fifo)) { + int frame_size = av_fifo_size(swf->audio_fifo); + put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG); + avio_wl16(pb, swf->sound_samples); + avio_wl16(pb, 0); // seek samples + av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write); + put_swf_end_tag(s); + + /* update FIFO */ + swf->sound_samples = 0; + } + + /* output the frame */ + put_swf_tag(s, TAG_SHOWFRAME); + put_swf_end_tag(s); + + avio_flush(s->pb); + + return 0; +} + +static int swf_write_audio(AVFormatContext *s, + AVCodecContext *enc, uint8_t *buf, int size) +{ + SWFContext *swf = s->priv_data; + + /* Flash Player limit */ + if (swf->swf_frame_number == 16000) + av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n"); + + if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) { + av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n"); + return -1; + } + + av_fifo_generic_write(swf->audio_fifo, buf, size, NULL); + swf->sound_samples += enc->frame_size; + + /* if audio only stream make sure we add swf frames */ + if (!swf->video_enc) + swf_write_video(s, enc, 0, 0); + + return 0; +} + +static int swf_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + AVCodecContext *codec = s->streams[pkt->stream_index]->codec; + if (codec->codec_type == AVMEDIA_TYPE_AUDIO) + return swf_write_audio(s, codec, pkt->data, pkt->size); + else + return swf_write_video(s, codec, pkt->data, pkt->size); +} + +static int swf_write_trailer(AVFormatContext *s) +{ + SWFContext *swf = s->priv_data; + AVIOContext *pb = s->pb; + AVCodecContext *enc, *video_enc; + int file_size, i; + + video_enc = NULL; + for(i=0;i<s->nb_streams;i++) { + enc = s->streams[i]->codec; + if (enc->codec_type == AVMEDIA_TYPE_VIDEO) + video_enc = enc; + else { + av_fifo_free(swf->audio_fifo); + swf->audio_fifo = NULL; + } + } + + put_swf_tag(s, TAG_END); + put_swf_end_tag(s); + + /* patch file size and number of frames if not streamed */ + if (s->pb->seekable && video_enc) { + file_size = avio_tell(pb); + avio_seek(pb, 4, SEEK_SET); + avio_wl32(pb, file_size); + avio_seek(pb, swf->duration_pos, SEEK_SET); + avio_wl16(pb, swf->video_frame_number); + if (swf->vframes_pos) { + avio_seek(pb, swf->vframes_pos, SEEK_SET); + avio_wl16(pb, swf->video_frame_number); + } + avio_seek(pb, file_size, SEEK_SET); + } + return 0; +} + +#if CONFIG_SWF_MUXER +AVOutputFormat ff_swf_muxer = { + .name = "swf", + .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"), + .mime_type = "application/x-shockwave-flash", + .extensions = "swf", + .priv_data_size = sizeof(SWFContext), + .audio_codec = AV_CODEC_ID_MP3, + .video_codec = AV_CODEC_ID_FLV1, + .write_header = swf_write_header, + .write_packet = swf_write_packet, + .write_trailer = swf_write_trailer, + .flags = AVFMT_TS_NONSTRICT, +}; +#endif +#if CONFIG_AVM2_MUXER +AVOutputFormat ff_avm2_muxer = { + .name = "avm2", + .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"), + .mime_type = "application/x-shockwave-flash", + .priv_data_size = sizeof(SWFContext), + .audio_codec = AV_CODEC_ID_MP3, + .video_codec = AV_CODEC_ID_FLV1, + .write_header = swf_write_header, + .write_packet = swf_write_packet, + .write_trailer = swf_write_trailer, + .flags = AVFMT_TS_NONSTRICT, +}; +#endif |