2 * Flash Compatible Streaming Format demuxer
3 * Copyright (c) 2000 Fabrice Bellard.
4 * Copyright (c) 2003 Tinic Uro.
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 static int get_swf_tag(ByteIOContext *pb, int *len_ptr)
38 // av_log(NULL, AV_LOG_DEBUG, "Tag: %d - Len: %d\n", tag, len);
44 static int swf_probe(AVProbeData *p)
46 /* check file header */
47 if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' &&
49 return AVPROBE_SCORE_MAX;
54 static int swf_read_header(AVFormatContext *s, AVFormatParameters *ap)
56 SWFContext *swf = s->priv_data;
57 ByteIOContext *pb = s->pb;
60 tag = get_be32(pb) & 0xffffff00;
62 if (tag == MKBETAG('C', 'W', 'S', 0)) {
63 av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n");
66 if (tag != MKBETAG('F', 'W', 'S', 0))
69 /* skip rectangle size */
70 nbits = get_byte(pb) >> 3;
71 len = (4 * nbits - 3 + 7) / 8;
73 swf->frame_rate = get_le16(pb); /* 8.8 fixed */
74 get_le16(pb); /* frame count */
76 swf->samples_per_frame = 0;
77 s->ctx_flags |= AVFMTCTX_NOHEADER;
81 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
83 SWFContext *swf = s->priv_data;
84 ByteIOContext *pb = s->pb;
85 AVStream *vst = NULL, *ast = NULL, *st = 0;
86 int tag, len, i, frame, v;
89 tag = get_swf_tag(pb, &len);
92 if (tag == TAG_VIDEOSTREAM && !vst) {
93 int ch_id = get_le16(pb);
99 vst = av_new_stream(s, ch_id);
102 vst->codec->codec_type = CODEC_TYPE_VIDEO;
103 vst->codec->codec_id = codec_get_id(swf_codec_tags, get_byte(pb));
104 av_set_pts_info(vst, 64, 256, swf->frame_rate);
105 vst->codec->time_base = (AVRational){ 256, swf->frame_rate };
107 } else if ((tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) && !ast) {
108 /* streaming found */
109 int sample_rate_code;
112 swf->samples_per_frame = get_le16(pb);
113 ast = av_new_stream(s, -1); /* -1 to avoid clash with video stream ch_id */
116 swf->audio_stream_index = ast->index;
117 ast->codec->channels = 1 + (v&1);
118 ast->codec->codec_type = CODEC_TYPE_AUDIO;
119 ast->codec->codec_id = codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
120 ast->need_parsing = AVSTREAM_PARSE_FULL;
121 sample_rate_code= (v>>2) & 3;
122 if (!sample_rate_code)
124 ast->codec->sample_rate = 11025 << (sample_rate_code-1);
125 av_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
127 } else if (tag == TAG_VIDEOFRAME) {
128 int ch_id = get_le16(pb);
130 for(i=0; i<s->nb_streams; i++) {
132 if (st->codec->codec_type == CODEC_TYPE_VIDEO && st->id == ch_id) {
133 frame = get_le16(pb);
134 av_get_packet(pb, pkt, len-2);
136 pkt->stream_index = st->index;
140 } else if (tag == TAG_STREAMBLOCK) {
141 st = s->streams[swf->audio_stream_index];
142 if (st->codec->codec_id == CODEC_ID_MP3) {
144 av_get_packet(pb, pkt, len-4);
145 } else { // ADPCM, PCM
146 av_get_packet(pb, pkt, len);
148 pkt->stream_index = st->index;
150 } else if (tag == TAG_JPEG2) {
151 for (i=0; i<s->nb_streams; i++) {
156 if (i == s->nb_streams) {
157 vst = av_new_stream(s, -2); /* -2 to avoid clash with video stream and audio stream */
160 vst->codec->codec_type = CODEC_TYPE_VIDEO;
161 vst->codec->codec_id = CODEC_ID_MJPEG;
162 av_set_pts_info(vst, 64, 256, swf->frame_rate);
163 vst->codec->time_base = (AVRational){ 256, swf->frame_rate };
166 get_le16(pb); /* BITMAP_ID */
167 av_new_packet(pkt, len-2);
168 get_buffer(pb, pkt->data, 4);
169 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
170 AV_RB32(pkt->data) == 0xffd9ffd8) {
171 /* old SWF files containing SOI/EOI as data start */
172 /* files created by swink have reversed tag */
174 get_buffer(pb, pkt->data, pkt->size);
176 get_buffer(pb, pkt->data + 4, pkt->size - 4);
178 pkt->stream_index = st->index;
186 AVInputFormat swf_demuxer = {
188 NULL_IF_CONFIG_SMALL("Flash format"),