| /* |
| * 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 "libavutil/intreadwrite.h" |
| #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, |
| }; |
