| /* |
| * 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(AVIOContext *pb, int *len_ptr) |
| { |
| int tag, len; |
| |
| if (url_feof(pb)) |
| return AVERROR_EOF; |
| |
| tag = avio_rl16(pb); |
| len = tag & 0x3f; |
| tag = tag >> 6; |
| if (len == 0x3f) { |
| len = avio_rl32(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; |
| } |
| |
| #if CONFIG_ZLIB |
| static int zlib_refill(void *opaque, uint8_t *buf, int buf_size) |
| { |
| AVFormatContext *s = opaque; |
| SWFContext *swf = s->priv_data; |
| z_stream *z = &swf->zstream; |
| int ret; |
| |
| retry: |
| if (!z->avail_in) { |
| int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE); |
| if (n <= 0) |
| return n; |
| z->next_in = swf->zbuf_in; |
| z->avail_in = n; |
| } |
| |
| z->next_out = buf; |
| z->avail_out = buf_size; |
| |
| ret = inflate(z, Z_NO_FLUSH); |
| if (ret < 0) |
| return AVERROR(EINVAL); |
| if (ret == Z_STREAM_END) |
| return AVERROR_EOF; |
| |
| if (buf_size - z->avail_out == 0) |
| goto retry; |
| |
| return buf_size - z->avail_out; |
| } |
| #endif |
| |
| 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; |
| avio_rl32(pb); |
| |
| if (tag == MKBETAG('C', 'W', 'S', 0)) { |
| av_log(s, AV_LOG_INFO, "SWF compressed file detected\n"); |
| #if CONFIG_ZLIB |
| swf->zbuf_in = av_malloc(ZBUF_SIZE); |
| swf->zbuf_out = av_malloc(ZBUF_SIZE); |
| swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s, |
| zlib_refill, NULL, NULL); |
| if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb) |
| return AVERROR(ENOMEM); |
| swf->zpb->seekable = 0; |
| if (inflateInit(&swf->zstream) != Z_OK) { |
| av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n"); |
| return AVERROR(EINVAL); |
| } |
| pb = swf->zpb; |
| #else |
| av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n"); |
| return AVERROR(EIO); |
| #endif |
| } else if (tag != MKBETAG('F', 'W', 'S', 0)) |
| return AVERROR(EIO); |
| /* 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; |
| |
| #if CONFIG_ZLIB |
| if (swf->zpb) |
| pb = swf->zpb; |
| #endif |
| |
| for(;;) { |
| uint64_t pos = avio_tell(pb); |
| tag = get_swf_tag(pb, &len); |
| if (tag < 0) |
| return tag; |
| 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(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 */ |
| ast->codec->channels = 1 + (v&1); |
| 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); |
| if ((res = av_get_packet(pb, pkt, len-2)) < 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 == CODEC_ID_MP3) { |
| avio_skip(pb, 4); |
| if ((res = av_get_packet(pb, pkt, len-4)) < 0) |
| return res; |
| } else { // ADPCM, PCM |
| 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 == 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 = CODEC_ID_MJPEG; |
| avpriv_set_pts_info(vst, 64, 256, swf->frame_rate); |
| st = vst; |
| } |
| avio_rl16(pb); /* BITMAP_ID */ |
| if ((res = av_new_packet(pkt, len-2)) < 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: |
| avio_skip(pb, len); |
| } |
| } |
| |
| #if CONFIG_ZLIB |
| static av_cold int swf_read_close(AVFormatContext *avctx) |
| { |
| SWFContext *s = avctx->priv_data; |
| inflateEnd(&s->zstream); |
| av_freep(&s->zbuf_in); |
| av_freep(&s->zbuf_out); |
| av_freep(&s->zpb); |
| return 0; |
| } |
| #endif |
| |
| AVInputFormat ff_swf_demuxer = { |
| .name = "swf", |
| .long_name = NULL_IF_CONFIG_SMALL("Flash format"), |
| .priv_data_size = sizeof(SWFContext), |
| .read_probe = swf_probe, |
| .read_header = swf_read_header, |
| .read_packet = swf_read_packet, |
| #if CONFIG_ZLIB |
| .read_close = swf_read_close, |
| #endif |
| }; |
