/* * Flash Compatible Streaming Format demuxer * 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 "swf.h" static int get_swf_tag(ByteIOContext *pb, int *len_ptr) { int tag, len; if (url_feof(pb)) return -1; tag = get_le16(pb); len = tag & 0x3f; tag = tag >> 6; if (len == 0x3f) { len = get_le32(pb); } // av_log(NULL, AV_LOG_DEBUG, "Tag: %d - Len: %d\n", tag, len); *len_ptr = len; return tag; } static int swf_probe(AVProbeData *p) { /* check file header */ if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' && p->buf[2] == 'S') return AVPROBE_SCORE_MAX; else return 0; } static int swf_read_header(AVFormatContext *s, AVFormatParameters *ap) { SWFContext *swf = s->priv_data; ByteIOContext *pb = s->pb; int nbits, len, tag; tag = get_be32(pb) & 0xffffff00; if (tag == MKBETAG('C', 'W', 'S', 0)) { av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n"); return AVERROR(EIO); } if (tag != MKBETAG('F', 'W', 'S', 0)) return AVERROR(EIO); get_le32(pb); /* skip rectangle size */ nbits = get_byte(pb) >> 3; len = (4 * nbits - 3 + 7) / 8; url_fskip(pb, len); swf->frame_rate = get_le16(pb); /* 8.8 fixed */ get_le16(pb); /* frame count */ swf->samples_per_frame = 0; s->ctx_flags |= AVFMTCTX_NOHEADER; return 0; } static int swf_read_packet(AVFormatContext *s, AVPacket *pkt) { SWFContext *swf = s->priv_data; ByteIOContext *pb = s->pb; AVStream *vst = NULL, *ast = NULL, *st = 0; int tag, len, i, frame, v; for(;;) { tag = get_swf_tag(pb, &len); if (tag < 0) return AVERROR(EIO); if (tag == TAG_VIDEOSTREAM && !vst) { int ch_id = get_le16(pb); get_le16(pb); get_le16(pb); get_le16(pb); get_byte(pb); /* Check for FLV1 */ vst = av_new_stream(s, ch_id); if (!vst) return -1; vst->codec->codec_type = CODEC_TYPE_VIDEO; vst->codec->codec_id = codec_get_id(swf_codec_tags, get_byte(pb)); av_set_pts_info(vst, 64, 256, swf->frame_rate); vst->codec->time_base = (AVRational){ 256, swf->frame_rate }; len -= 10; } else if ((tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) && !ast) { /* streaming found */ int sample_rate_code; get_byte(pb); v = get_byte(pb); swf->samples_per_frame = get_le16(pb); ast = av_new_stream(s, -1); /* -1 to avoid clash with video stream ch_id */ if (!ast) return -1; swf->audio_stream_index = ast->index; ast->codec->channels = 1 + (v&1); ast->codec->codec_type = CODEC_TYPE_AUDIO; ast->codec->codec_id = codec_get_id(swf_audio_codec_tags, (v>>4) & 15); ast->need_parsing = AVSTREAM_PARSE_FULL; sample_rate_code= (v>>2) & 3; if (!sample_rate_code) return AVERROR(EIO); ast->codec->sample_rate = 11025 << (sample_rate_code-1); av_set_pts_info(ast, 64, 1, ast->codec->sample_rate); len -= 4; } else if (tag == TAG_VIDEOFRAME) { int ch_id = get_le16(pb); len -= 2; for(i=0; i<s->nb_streams; i++) { st = s->streams[i]; if (st->codec->codec_type == CODEC_TYPE_VIDEO && st->id == ch_id) { frame = get_le16(pb); av_get_packet(pb, pkt, len-2); pkt->pts = frame; pkt->stream_index = st->index; return pkt->size; } } } else if (tag == TAG_STREAMBLOCK) { st = s->streams[swf->audio_stream_index]; if (st->codec->codec_id == CODEC_ID_MP3) { url_fskip(pb, 4); av_get_packet(pb, pkt, len-4); } else { // ADPCM, PCM av_get_packet(pb, pkt, len); } pkt->stream_index = st->index; return pkt->size; } else if (tag == TAG_JPEG2) { for (i=0; i<s->nb_streams; i++) { st = s->streams[i]; if (st->id == -2) break; } if (i == s->nb_streams) { vst = av_new_stream(s, -2); /* -2 to avoid clash with video stream and audio stream */ if (!vst) return -1; vst->codec->codec_type = CODEC_TYPE_VIDEO; vst->codec->codec_id = CODEC_ID_MJPEG; av_set_pts_info(vst, 64, 256, swf->frame_rate); vst->codec->time_base = (AVRational){ 256, swf->frame_rate }; st = vst; } get_le16(pb); /* BITMAP_ID */ av_new_packet(pkt, len-2); get_buffer(pb, pkt->data, 4); if (AV_RB32(pkt->data) == 0xffd8ffd9 || AV_RB32(pkt->data) == 0xffd9ffd8) { /* old SWF files containing SOI/EOI as data start */ /* files created by swink have reversed tag */ pkt->size -= 4; get_buffer(pb, pkt->data, pkt->size); } else { get_buffer(pb, pkt->data + 4, pkt->size - 4); } pkt->stream_index = st->index; return pkt->size; } url_fskip(pb, len); } return 0; } AVInputFormat swf_demuxer = { "swf", NULL_IF_CONFIG_SMALL("Flash format"), sizeof(SWFContext), swf_probe, swf_read_header, swf_read_packet, };