/* * Flash Compatible Streaming Format demuxer * Copyright (c) 2000 Fabrice Bellard * Copyright (c) 2003 Tinic Uro * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/channel_layout.h" #include "libavutil/intreadwrite.h" #include "swf.h" static const AVCodecTag swf_audio_codec_tags[] = { { AV_CODEC_ID_PCM_S16LE, 0x00 }, { AV_CODEC_ID_ADPCM_SWF, 0x01 }, { AV_CODEC_ID_MP3, 0x02 }, { AV_CODEC_ID_PCM_S16LE, 0x03 }, // { AV_CODEC_ID_NELLYMOSER, 0x06 }, { AV_CODEC_ID_NONE, 0 }, }; static int get_swf_tag(AVIOContext *pb, int *len_ptr) { int tag, len; if (pb->eof_reached) return -1; tag = avio_rl16(pb); len = tag & 0x3f; tag = tag >> 6; if (len == 0x3f) { len = avio_rl32(pb); } *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) { SWFContext *swf = s->priv_data; AVIOContext *pb = s->pb; int nbits, len, tag; tag = avio_rb32(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); avio_rl32(pb); /* skip rectangle size */ nbits = avio_r8(pb) >> 3; len = (4 * nbits - 3 + 7) / 8; avio_skip(pb, len); swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */ avio_rl16(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; AVIOContext *pb = s->pb; AVStream *vst = NULL, *ast = NULL, *st = 0; int tag, len, i, frame, v, res; for(;;) { uint64_t pos = avio_tell(pb); tag = get_swf_tag(pb, &len); if (tag < 0) return AVERROR(EIO); if (len < 0) { av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len); return AVERROR_INVALIDDATA; } if (tag == TAG_VIDEOSTREAM) { int ch_id = avio_rl16(pb); len -= 2; for (i=0; i<s->nb_streams; i++) { st = s->streams[i]; if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) goto skip; } avio_rl16(pb); avio_rl16(pb); avio_rl16(pb); avio_r8(pb); /* Check for FLV1 */ vst = avformat_new_stream(s, NULL); if (!vst) return -1; vst->id = ch_id; vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb)); avpriv_set_pts_info(vst, 16, 256, swf->frame_rate); len -= 8; } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) { /* streaming found */ int sample_rate_code; for (i=0; i<s->nb_streams; i++) { st = s->streams[i]; if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) goto skip; } avio_r8(pb); v = avio_r8(pb); swf->samples_per_frame = avio_rl16(pb); ast = avformat_new_stream(s, NULL); if (!ast) return -1; ast->id = -1; /* -1 to avoid clash with video stream ch_id */ if (v & 1) { ast->codec->channels = 2; ast->codec->channel_layout = AV_CH_LAYOUT_STEREO; } else { ast->codec->channels = 1; ast->codec->channel_layout = AV_CH_LAYOUT_MONO; } ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15); ast->need_parsing = AVSTREAM_PARSE_FULL; sample_rate_code= (v>>2) & 3; ast->codec->sample_rate = 44100 >> (3 - sample_rate_code); avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); len -= 4; } else if (tag == TAG_VIDEOFRAME) { int ch_id = avio_rl16(pb); len -= 2; for(i=0; i<s->nb_streams; i++) { st = s->streams[i]; if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) { frame = avio_rl16(pb); len -= 2; if (len <= 0) goto skip; if ((res = av_get_packet(pb, pkt, len)) < 0) return res; pkt->pos = pos; pkt->pts = frame; pkt->stream_index = st->index; return pkt->size; } } } else if (tag == TAG_STREAMBLOCK) { for (i = 0; i < s->nb_streams; i++) { st = s->streams[i]; if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) { if (st->codec->codec_id == AV_CODEC_ID_MP3) { avio_skip(pb, 4); len -= 4; if (len <= 0) goto skip; if ((res = av_get_packet(pb, pkt, len)) < 0) return res; } else { // ADPCM, PCM if (len <= 0) goto skip; if ((res = av_get_packet(pb, pkt, len)) < 0) return res; } pkt->pos = pos; 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->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2) break; } if (i == s->nb_streams) { vst = avformat_new_stream(s, NULL); if (!vst) return -1; vst->id = -2; /* -2 to avoid clash with video stream and audio stream */ vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; vst->codec->codec_id = AV_CODEC_ID_MJPEG; avpriv_set_pts_info(vst, 64, 256, swf->frame_rate); st = vst; } avio_rl16(pb); /* BITMAP_ID */ len -= 2; if (len < 4) goto skip; if ((res = av_new_packet(pkt, len)) < 0) return res; avio_read(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; avio_read(pb, pkt->data, pkt->size); } else { avio_read(pb, pkt->data + 4, pkt->size - 4); } pkt->pos = pos; pkt->stream_index = st->index; return pkt->size; } skip: len = FFMAX(0, len); avio_skip(pb, len); } } AVInputFormat ff_swf_demuxer = { .name = "swf", .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"), .priv_data_size = sizeof(SWFContext), .read_probe = swf_probe, .read_header = swf_read_header, .read_packet = swf_read_packet, };