From 3b35f4ab51b8b720491ff5c9b4e86e2de8ebce07 Mon Sep 17 00:00:00 2001 From: Baptiste Coudurier Date: Tue, 20 May 2008 23:31:10 +0000 Subject: split swf de/muxer Originally committed as revision 13203 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/swfenc.c | 561 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 561 insertions(+) create mode 100644 libavformat/swfenc.c (limited to 'libavformat/swfenc.c') diff --git a/libavformat/swfenc.c b/libavformat/swfenc.c new file mode 100644 index 0000000000..a793742bf3 --- /dev/null +++ b/libavformat/swfenc.c @@ -0,0 +1,561 @@ +/* + * 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/bitstream.h" +#include "avformat.h" +#include "swf.h" + +static void put_swf_tag(AVFormatContext *s, int tag) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *pb = s->pb; + + swf->tag_pos = url_ftell(pb); + swf->tag = tag; + /* reserve some room for the tag */ + if (tag & TAG_LONG) { + put_le16(pb, 0); + put_le32(pb, 0); + } else { + put_le16(pb, 0); + } +} + +static void put_swf_end_tag(AVFormatContext *s) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *pb = s->pb; + offset_t pos; + int tag_len, tag; + + pos = url_ftell(pb); + tag_len = pos - swf->tag_pos - 2; + tag = swf->tag; + url_fseek(pb, swf->tag_pos, SEEK_SET); + if (tag & TAG_LONG) { + tag &= ~TAG_LONG; + put_le16(pb, (tag << 6) | 0x3f); + put_le32(pb, tag_len - 4); + } else { + assert(tag_len < 0x3f); + put_le16(pb, (tag << 6) | tag_len); + } + url_fseek(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(ByteIOContext *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); + put_buffer(pb, buf, pbBufPtr(&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 + +/* put matrix */ +static void put_swf_matrix(ByteIOContext *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); + put_buffer(pb, buf, pbBufPtr(&p) - p.buf); +} + +/* */ +static int swf_write_header(AVFormatContext *s) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *pb = s->pb; + AVCodecContext *enc, *audio_enc, *video_enc; + PutBitContext p; + uint8_t buf1[256]; + int i, width, height, rate, rate_base; + int is_avm2; + + swf->audio_in_pos = 0; + swf->sound_samples = 0; + swf->swf_frame_number = 0; + swf->video_frame_number = 0; + + video_enc = NULL; + audio_enc = NULL; + for(i=0;inb_streams;i++) { + enc = s->streams[i]->codec; + if (enc->codec_type == CODEC_TYPE_AUDIO) { + if (enc->codec_id == CODEC_ID_MP3) { + if (!enc->frame_size) { + av_log(s, AV_LOG_ERROR, "audio frame size not set\n"); + return -1; + } + audio_enc = enc; + } else { + av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n"); + return -1; + } + } else { + if (enc->codec_id == CODEC_ID_VP6F || + enc->codec_id == CODEC_ID_FLV1 || + enc->codec_id == CODEC_ID_MJPEG) { + video_enc = enc; + } else { + av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n"); + return -1; + } + } + } + + if (!video_enc) { + /* currently, cannot work correctly if audio only */ + swf->video_type = 0; + width = 320; + height = 200; + rate = 10; + rate_base= 1; + } else { + swf->video_type = video_enc->codec_id; + width = video_enc->width; + height = video_enc->height; + rate = video_enc->time_base.den; + rate_base = video_enc->time_base.num; + } + + if (!audio_enc) { + swf->audio_type = 0; + swf->samples_per_frame = (44100. * rate_base) / rate; + } else { + swf->audio_type = audio_enc->codec_id; + swf->samples_per_frame = (audio_enc->sample_rate * rate_base) / rate; + } + + is_avm2 = !strcmp("avm2", s->oformat->name); + + put_tag(pb, "FWS"); + if (is_avm2) { + put_byte(pb, 9); + } else if (video_enc && video_enc->codec_id == CODEC_ID_VP6F) { + put_byte(pb, 8); /* version (version 8 and above support VP6 codec) */ + } else if (video_enc && video_enc->codec_id == CODEC_ID_FLV1) { + put_byte(pb, 6); /* version (version 6 and above support FLV1 codec) */ + } else { + put_byte(pb, 4); /* version (should use 4 for mpeg audio support) */ + } + put_le32(pb, DUMMY_FILE_SIZE); /* dummy size + (will be patched if not streamed) */ + + put_swf_rect(pb, 0, width * 20, 0, height * 20); + put_le16(pb, (rate * 256) / rate_base); /* frame rate */ + swf->duration_pos = url_ftell(pb); + put_le16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */ + + /* avm2/swf v9 (also v8?) files require a file attribute tag */ + if (is_avm2) { + put_swf_tag(s, TAG_FILEATTRIBUTES); + put_le32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */ + put_swf_end_tag(s); + } + + /* define a shape with the jpeg inside */ + if (video_enc && (video_enc->codec_id == CODEC_ID_VP6F || + video_enc->codec_id == CODEC_ID_FLV1)) { + } else if (video_enc && video_enc->codec_id == CODEC_ID_MJPEG) { + put_swf_tag(s, TAG_DEFINESHAPE); + + put_le16(pb, SHAPE_ID); /* ID of shape */ + /* bounding rectangle */ + put_swf_rect(pb, 0, width, 0, height); + /* style info */ + put_byte(pb, 1); /* one fill style */ + put_byte(pb, 0x41); /* clipped bitmap fill */ + put_le16(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); + put_byte(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); + put_buffer(pb, buf1, pbBufPtr(&p) - p.buf); + + put_swf_end_tag(s); + } + + if (audio_enc && audio_enc->codec_id == CODEC_ID_MP3) { + int v; + + /* start sound */ + put_swf_tag(s, TAG_STREAMHEAD2); + + v = 0; + switch(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 (audio_enc->channels == 2) + v |= 0x01; /* stereo playback */ + put_byte(s->pb, v); + v |= 0x20; /* mp3 compressed */ + put_byte(s->pb, v); + put_le16(s->pb, swf->samples_per_frame); /* avg samples per frame */ + put_le16(s->pb, 0); + + put_swf_end_tag(s); + } + + put_flush_packet(s->pb); + return 0; +} + +static int swf_write_video(AVFormatContext *s, + AVCodecContext *enc, const uint8_t *buf, int size) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *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 (swf->video_type == CODEC_ID_VP6F || + swf->video_type == CODEC_ID_FLV1) { + if (swf->video_frame_number == 0) { + /* create a new video object */ + put_swf_tag(s, TAG_VIDEOSTREAM); + put_le16(pb, VIDEO_ID); + put_le16(pb, 15000); /* hard flash player limit */ + put_le16(pb, enc->width); + put_le16(pb, enc->height); + put_byte(pb, 0); + put_byte(pb,codec_get_tag(swf_codec_tags,swf->video_type)); + put_swf_end_tag(s); + + /* place the video object for the first time */ + put_swf_tag(s, TAG_PLACEOBJECT2); + put_byte(pb, 0x36); + put_le16(pb, 1); + put_le16(pb, VIDEO_ID); + put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0); + put_le16(pb, swf->video_frame_number); + put_byte(pb, 'v'); + put_byte(pb, 'i'); + put_byte(pb, 'd'); + put_byte(pb, 'e'); + put_byte(pb, 'o'); + put_byte(pb, 0x00); + put_swf_end_tag(s); + } else { + /* mark the character for update */ + put_swf_tag(s, TAG_PLACEOBJECT2); + put_byte(pb, 0x11); + put_le16(pb, 1); + put_le16(pb, swf->video_frame_number); + put_swf_end_tag(s); + } + + /* set video frame data */ + put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG); + put_le16(pb, VIDEO_ID); + put_le16(pb, swf->video_frame_number++); + put_buffer(pb, buf, size); + put_swf_end_tag(s); + } else if (swf->video_type == CODEC_ID_MJPEG) { + if (swf->swf_frame_number > 0) { + /* remove the shape */ + put_swf_tag(s, TAG_REMOVEOBJECT); + put_le16(pb, SHAPE_ID); /* shape ID */ + put_le16(pb, 1); /* depth */ + put_swf_end_tag(s); + + /* free the bitmap */ + put_swf_tag(s, TAG_FREECHARACTER); + put_le16(pb, BITMAP_ID); + put_swf_end_tag(s); + } + + put_swf_tag(s, TAG_JPEG2 | TAG_LONG); + + put_le16(pb, BITMAP_ID); /* ID of the image */ + + /* a dummy jpeg header seems to be required */ + put_byte(pb, 0xff); + put_byte(pb, 0xd8); + put_byte(pb, 0xff); + put_byte(pb, 0xd9); + /* write the jpeg image */ + put_buffer(pb, buf, size); + + put_swf_end_tag(s); + + /* draw the shape */ + + put_swf_tag(s, TAG_PLACEOBJECT); + put_le16(pb, SHAPE_ID); /* shape ID */ + put_le16(pb, 1); /* depth */ + put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0); + put_swf_end_tag(s); + } else { + /* invalid codec */ + } + + swf->swf_frame_number ++; + + /* streaming sound always should be placed just before showframe tags */ + if (swf->audio_type && swf->audio_in_pos) { + put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG); + put_le16(pb, swf->sound_samples); + put_le16(pb, 0); // seek samples + put_buffer(pb, swf->audio_fifo, swf->audio_in_pos); + put_swf_end_tag(s); + + /* update FIFO */ + swf->sound_samples = 0; + swf->audio_in_pos = 0; + } + + /* output the frame */ + put_swf_tag(s, TAG_SHOWFRAME); + put_swf_end_tag(s); + + put_flush_packet(s->pb); + + return 0; +} + +static int swf_write_audio(AVFormatContext *s, + AVCodecContext *enc, const 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 (swf->audio_in_pos + size >= AUDIO_FIFO_SIZE) { + av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n"); + return -1; + } + + memcpy(swf->audio_fifo + swf->audio_in_pos, buf, size); + swf->audio_in_pos += size; + swf->sound_samples += enc->frame_size; + + /* if audio only stream make sure we add swf frames */ + if (swf->video_type == 0) { + 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 == CODEC_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; + ByteIOContext *pb = s->pb; + AVCodecContext *enc, *video_enc; + int file_size, i; + + video_enc = NULL; + for(i=0;inb_streams;i++) { + enc = s->streams[i]->codec; + if (enc->codec_type == CODEC_TYPE_VIDEO) + video_enc = enc; + } + + put_swf_tag(s, TAG_END); + put_swf_end_tag(s); + + put_flush_packet(s->pb); + + /* patch file size and number of frames if not streamed */ + if (!url_is_streamed(s->pb) && video_enc) { + file_size = url_ftell(pb); + url_fseek(pb, 4, SEEK_SET); + put_le32(pb, file_size); + url_fseek(pb, swf->duration_pos, SEEK_SET); + put_le16(pb, video_enc->frame_number); + url_fseek(pb, file_size, SEEK_SET); + } + return 0; +} + +#ifdef CONFIG_SWF_MUXER +AVOutputFormat swf_muxer = { + "swf", + "Flash format", + "application/x-shockwave-flash", + "swf", + sizeof(SWFContext), + CODEC_ID_MP3, + CODEC_ID_FLV1, + swf_write_header, + swf_write_packet, + swf_write_trailer, +}; +#endif +#ifdef CONFIG_AVM2_MUXER +AVOutputFormat avm2_muxer = { + "avm2", + "Flash 9 (AVM2) format", + "application/x-shockwave-flash", + NULL, + sizeof(SWFContext), + CODEC_ID_MP3, + CODEC_ID_FLV1, + swf_write_header, + swf_write_packet, + swf_write_trailer, +}; +#endif -- cgit v1.2.3