6a923f307d1059c790a23dac544262aa4ffab543
[libav.git] / libavformat / swfdec.c
1 /*
2 * Flash Compatible Streaming Format demuxer
3 * Copyright (c) 2000 Fabrice Bellard
4 * Copyright (c) 2003 Tinic Uro
5 *
6 * This file is part of Libav.
7 *
8 * Libav 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.
12 *
13 * Libav 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.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "libavutil/intreadwrite.h"
24 #include "swf.h"
25
26 static const AVCodecTag swf_audio_codec_tags[] = {
27 { AV_CODEC_ID_PCM_S16LE, 0x00 },
28 { AV_CODEC_ID_ADPCM_SWF, 0x01 },
29 { AV_CODEC_ID_MP3, 0x02 },
30 { AV_CODEC_ID_PCM_S16LE, 0x03 },
31 // { AV_CODEC_ID_NELLYMOSER, 0x06 },
32 { AV_CODEC_ID_NONE, 0 },
33 };
34
35 static int get_swf_tag(AVIOContext *pb, int *len_ptr)
36 {
37 int tag, len;
38
39 if (pb->eof_reached)
40 return -1;
41
42 tag = avio_rl16(pb);
43 len = tag & 0x3f;
44 tag = tag >> 6;
45 if (len == 0x3f) {
46 len = avio_rl32(pb);
47 }
48 // av_log(NULL, AV_LOG_DEBUG, "Tag: %d - Len: %d\n", tag, len);
49 *len_ptr = len;
50 return tag;
51 }
52
53
54 static int swf_probe(AVProbeData *p)
55 {
56 /* check file header */
57 if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' &&
58 p->buf[2] == 'S')
59 return AVPROBE_SCORE_MAX;
60 else
61 return 0;
62 }
63
64 static int swf_read_header(AVFormatContext *s)
65 {
66 SWFContext *swf = s->priv_data;
67 AVIOContext *pb = s->pb;
68 int nbits, len, tag;
69
70 tag = avio_rb32(pb) & 0xffffff00;
71
72 if (tag == MKBETAG('C', 'W', 'S', 0)) {
73 av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n");
74 return AVERROR(EIO);
75 }
76 if (tag != MKBETAG('F', 'W', 'S', 0))
77 return AVERROR(EIO);
78 avio_rl32(pb);
79 /* skip rectangle size */
80 nbits = avio_r8(pb) >> 3;
81 len = (4 * nbits - 3 + 7) / 8;
82 avio_skip(pb, len);
83 swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
84 avio_rl16(pb); /* frame count */
85
86 swf->samples_per_frame = 0;
87 s->ctx_flags |= AVFMTCTX_NOHEADER;
88 return 0;
89 }
90
91 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
92 {
93 SWFContext *swf = s->priv_data;
94 AVIOContext *pb = s->pb;
95 AVStream *vst = NULL, *ast = NULL, *st = 0;
96 int tag, len, i, frame, v, res;
97
98 for(;;) {
99 uint64_t pos = avio_tell(pb);
100 tag = get_swf_tag(pb, &len);
101 if (tag < 0)
102 return AVERROR(EIO);
103 if (tag == TAG_VIDEOSTREAM) {
104 int ch_id = avio_rl16(pb);
105 len -= 2;
106
107 for (i=0; i<s->nb_streams; i++) {
108 st = s->streams[i];
109 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
110 goto skip;
111 }
112
113 avio_rl16(pb);
114 avio_rl16(pb);
115 avio_rl16(pb);
116 avio_r8(pb);
117 /* Check for FLV1 */
118 vst = avformat_new_stream(s, NULL);
119 if (!vst)
120 return -1;
121 vst->id = ch_id;
122 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
123 vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
124 avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
125 len -= 8;
126 } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
127 /* streaming found */
128 int sample_rate_code;
129
130 for (i=0; i<s->nb_streams; i++) {
131 st = s->streams[i];
132 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
133 goto skip;
134 }
135
136 avio_r8(pb);
137 v = avio_r8(pb);
138 swf->samples_per_frame = avio_rl16(pb);
139 ast = avformat_new_stream(s, NULL);
140 if (!ast)
141 return -1;
142 ast->id = -1; /* -1 to avoid clash with video stream ch_id */
143 ast->codec->channels = 1 + (v&1);
144 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
145 ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
146 ast->need_parsing = AVSTREAM_PARSE_FULL;
147 sample_rate_code= (v>>2) & 3;
148 ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
149 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
150 len -= 4;
151 } else if (tag == TAG_VIDEOFRAME) {
152 int ch_id = avio_rl16(pb);
153 len -= 2;
154 for(i=0; i<s->nb_streams; i++) {
155 st = s->streams[i];
156 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
157 frame = avio_rl16(pb);
158 if ((res = av_get_packet(pb, pkt, len-2)) < 0)
159 return res;
160 pkt->pos = pos;
161 pkt->pts = frame;
162 pkt->stream_index = st->index;
163 return pkt->size;
164 }
165 }
166 } else if (tag == TAG_STREAMBLOCK) {
167 for (i = 0; i < s->nb_streams; i++) {
168 st = s->streams[i];
169 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
170 if (st->codec->codec_id == AV_CODEC_ID_MP3) {
171 avio_skip(pb, 4);
172 if ((res = av_get_packet(pb, pkt, len-4)) < 0)
173 return res;
174 } else { // ADPCM, PCM
175 if ((res = av_get_packet(pb, pkt, len)) < 0)
176 return res;
177 }
178 pkt->pos = pos;
179 pkt->stream_index = st->index;
180 return pkt->size;
181 }
182 }
183 } else if (tag == TAG_JPEG2) {
184 for (i=0; i<s->nb_streams; i++) {
185 st = s->streams[i];
186 if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
187 break;
188 }
189 if (i == s->nb_streams) {
190 vst = avformat_new_stream(s, NULL);
191 if (!vst)
192 return -1;
193 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
194 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
195 vst->codec->codec_id = AV_CODEC_ID_MJPEG;
196 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
197 st = vst;
198 }
199 avio_rl16(pb); /* BITMAP_ID */
200 if ((res = av_new_packet(pkt, len-2)) < 0)
201 return res;
202 avio_read(pb, pkt->data, 4);
203 if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
204 AV_RB32(pkt->data) == 0xffd9ffd8) {
205 /* old SWF files containing SOI/EOI as data start */
206 /* files created by swink have reversed tag */
207 pkt->size -= 4;
208 avio_read(pb, pkt->data, pkt->size);
209 } else {
210 avio_read(pb, pkt->data + 4, pkt->size - 4);
211 }
212 pkt->pos = pos;
213 pkt->stream_index = st->index;
214 return pkt->size;
215 }
216 skip:
217 avio_skip(pb, len);
218 }
219 }
220
221 AVInputFormat ff_swf_demuxer = {
222 .name = "swf",
223 .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
224 .priv_data_size = sizeof(SWFContext),
225 .read_probe = swf_probe,
226 .read_header = swf_read_header,
227 .read_packet = swf_read_packet,
228 };