550 lines
18 KiB
C
550 lines
18 KiB
C
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/*
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* Flash Compatible Streaming Format demuxer
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* Copyright (c) 2000 Fabrice Bellard
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* Copyright (c) 2003 Tinic Uro
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#if CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#include "libavutil/avassert.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/get_bits.h"
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#include "swf.h"
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static const AVCodecTag swf_audio_codec_tags[] = {
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{ AV_CODEC_ID_PCM_S16LE, 0x00 },
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{ AV_CODEC_ID_ADPCM_SWF, 0x01 },
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{ AV_CODEC_ID_MP3, 0x02 },
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{ AV_CODEC_ID_PCM_S16LE, 0x03 },
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// { AV_CODEC_ID_NELLYMOSER, 0x06 },
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{ AV_CODEC_ID_NONE, 0 },
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};
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static int get_swf_tag(AVIOContext *pb, int *len_ptr)
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{
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int tag, len;
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if (avio_feof(pb))
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return AVERROR_EOF;
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tag = avio_rl16(pb);
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len = tag & 0x3f;
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tag = tag >> 6;
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if (len == 0x3f) {
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len = avio_rl32(pb);
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}
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*len_ptr = len;
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return tag;
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}
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static int swf_probe(const AVProbeData *p)
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{
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GetBitContext gb;
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int len, xmin, xmax, ymin, ymax;
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if(p->buf_size < 15)
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return 0;
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/* check file header */
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if ( AV_RB24(p->buf) != AV_RB24("CWS")
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&& AV_RB24(p->buf) != AV_RB24("FWS"))
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return 0;
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if ( AV_RB24(p->buf) == AV_RB24("CWS")
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&& p->buf[3] <= 20)
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return AVPROBE_SCORE_MAX / 4 + 1;
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if (init_get_bits8(&gb, p->buf + 3, p->buf_size - 3) < 0)
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return 0;
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skip_bits(&gb, 40);
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len = get_bits(&gb, 5);
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if (!len)
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return 0;
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xmin = get_bits_long(&gb, len);
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xmax = get_bits_long(&gb, len);
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ymin = get_bits_long(&gb, len);
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ymax = get_bits_long(&gb, len);
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if (xmin || ymin || !xmax || !ymax)
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return 0;
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if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
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return AVPROBE_SCORE_MAX / 4;
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return AVPROBE_SCORE_EXTENSION + 1;
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}
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#if CONFIG_ZLIB
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static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
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{
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AVFormatContext *s = opaque;
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SWFContext *swf = s->priv_data;
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z_stream *z = &swf->zstream;
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int ret;
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retry:
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if (!z->avail_in) {
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int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
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if (n < 0)
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return n;
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z->next_in = swf->zbuf_in;
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z->avail_in = n;
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}
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z->next_out = buf;
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z->avail_out = buf_size;
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ret = inflate(z, Z_NO_FLUSH);
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if (ret == Z_STREAM_END)
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return AVERROR_EOF;
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if (ret != Z_OK)
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return AVERROR(EINVAL);
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if (buf_size - z->avail_out == 0)
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goto retry;
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return buf_size - z->avail_out;
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}
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static av_cold int swf_read_close(AVFormatContext *avctx);
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#endif
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static int swf_read_header(AVFormatContext *s)
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{
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SWFContext *swf = s->priv_data;
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AVIOContext *pb = s->pb;
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int nbits, len, tag;
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tag = avio_rb32(pb) & 0xffffff00;
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avio_rl32(pb);
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if (tag == MKBETAG('C', 'W', 'S', 0)) {
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av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
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#if CONFIG_ZLIB
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if (inflateInit(&swf->zstream) != Z_OK) {
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av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
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return AVERROR(EINVAL);
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}
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if (!(swf->zbuf_in = av_malloc(ZBUF_SIZE)) ||
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!(swf->zbuf_out = av_malloc(ZBUF_SIZE)) ||
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!(swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0,
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s, zlib_refill, NULL, NULL))) {
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swf_read_close(s);
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return AVERROR(ENOMEM);
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}
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swf->zpb->seekable = 0;
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pb = swf->zpb;
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#else
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av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
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return AVERROR(EIO);
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#endif
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} else if (tag != MKBETAG('F', 'W', 'S', 0))
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return AVERROR(EIO);
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/* skip rectangle size */
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nbits = avio_r8(pb) >> 3;
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len = (4 * nbits - 3 + 7) / 8;
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avio_skip(pb, len);
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swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
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avio_rl16(pb); /* frame count */
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swf->samples_per_frame = 0;
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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return 0;
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}
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static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
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{
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int sample_rate_code, sample_size_code;
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AVStream *ast = avformat_new_stream(s, NULL);
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if (!ast)
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return NULL;
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ast->id = id;
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if (info & 1) {
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ast->codecpar->channels = 2;
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ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
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} else {
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ast->codecpar->channels = 1;
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ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
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}
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ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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ast->codecpar->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
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ast->need_parsing = AVSTREAM_PARSE_FULL;
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sample_rate_code = info>>2 & 3;
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sample_size_code = info>>1 & 1;
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if (!sample_size_code && ast->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE)
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ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
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ast->codecpar->sample_rate = 44100 >> (3 - sample_rate_code);
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avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
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return ast;
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}
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static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SWFContext *swf = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *vst = NULL, *ast = NULL, *st = 0;
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int tag, len, i, frame, v, res;
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#if CONFIG_ZLIB
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if (swf->zpb)
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pb = swf->zpb;
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#endif
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for(;;) {
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uint64_t pos = avio_tell(pb);
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tag = get_swf_tag(pb, &len);
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if (tag < 0)
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return tag;
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if (len < 0) {
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av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
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return AVERROR_INVALIDDATA;
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}
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if (tag == TAG_VIDEOSTREAM) {
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int ch_id = avio_rl16(pb);
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len -= 2;
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for (i=0; i<s->nb_streams; i++) {
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st = s->streams[i];
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if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
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goto skip;
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}
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avio_rl16(pb);
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avio_rl16(pb);
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avio_rl16(pb);
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avio_r8(pb);
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/* Check for FLV1 */
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vst = avformat_new_stream(s, NULL);
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if (!vst)
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return AVERROR(ENOMEM);
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vst->id = ch_id;
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vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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vst->codecpar->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
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avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
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len -= 8;
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} else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
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/* streaming found */
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for (i=0; i<s->nb_streams; i++) {
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st = s->streams[i];
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if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
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goto skip;
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}
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avio_r8(pb);
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v = avio_r8(pb);
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swf->samples_per_frame = avio_rl16(pb);
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ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
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if (!ast)
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return AVERROR(ENOMEM);
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len -= 4;
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} else if (tag == TAG_DEFINESOUND) {
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/* audio stream */
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int ch_id = avio_rl16(pb);
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for (i=0; i<s->nb_streams; i++) {
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st = s->streams[i];
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if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
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goto skip;
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}
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// FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
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// these are smaller audio streams in DEFINESOUND tags, but it's technically
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// possible they could be huge. Break it up into multiple packets if it's big.
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v = avio_r8(pb);
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ast = create_new_audio_stream(s, ch_id, v);
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if (!ast)
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return AVERROR(ENOMEM);
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ast->duration = avio_rl32(pb); // number of samples
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if (((v>>4) & 15) == 2) { // MP3 sound data record
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ast->skip_samples = avio_rl16(pb);
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len -= 2;
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}
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len -= 7;
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if ((res = av_get_packet(pb, pkt, len)) < 0)
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return res;
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pkt->pos = pos;
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pkt->stream_index = ast->index;
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return pkt->size;
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} else if (tag == TAG_VIDEOFRAME) {
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int ch_id = avio_rl16(pb);
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len -= 2;
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for(i=0; i<s->nb_streams; i++) {
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st = s->streams[i];
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if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
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frame = avio_rl16(pb);
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len -= 2;
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if (len <= 0)
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goto skip;
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if ((res = av_get_packet(pb, pkt, len)) < 0)
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return res;
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pkt->pos = pos;
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pkt->pts = frame;
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pkt->stream_index = st->index;
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return pkt->size;
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}
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}
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} else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
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#if CONFIG_ZLIB
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long out_len;
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uint8_t *buf = NULL, *zbuf = NULL, *pal;
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uint32_t colormap[AVPALETTE_COUNT] = {0};
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const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
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const int colormapbpp = 3 + alpha_bmp;
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int linesize, colormapsize = 0;
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const int ch_id = avio_rl16(pb);
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const int bmp_fmt = avio_r8(pb);
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const int width = avio_rl16(pb);
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const int height = avio_rl16(pb);
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int pix_fmt;
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len -= 2+1+2+2;
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switch (bmp_fmt) {
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case 3: // PAL-8
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linesize = width;
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colormapsize = avio_r8(pb) + 1;
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len--;
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break;
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case 4: // RGB15
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linesize = width * 2;
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break;
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case 5: // RGB24 (0RGB)
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linesize = width * 4;
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break;
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default:
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av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
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goto bitmap_end_skip;
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}
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linesize = FFALIGN(linesize, 4);
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if (av_image_check_size(width, height, 0, s) < 0 ||
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linesize >= INT_MAX / height ||
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linesize * height >= INT_MAX - colormapsize * colormapbpp) {
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av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
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goto bitmap_end_skip;
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}
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|
|
||
|
|
out_len = colormapsize * colormapbpp + linesize * height;
|
||
|
|
|
||
|
|
ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
|
||
|
|
ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
|
||
|
|
|
||
|
|
zbuf = av_malloc(len);
|
||
|
|
buf = av_malloc(out_len);
|
||
|
|
if (!zbuf || !buf) {
|
||
|
|
res = AVERROR(ENOMEM);
|
||
|
|
goto bitmap_end;
|
||
|
|
}
|
||
|
|
|
||
|
|
len = avio_read(pb, zbuf, len);
|
||
|
|
if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
|
||
|
|
av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
|
||
|
|
goto bitmap_end_skip;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < s->nb_streams; i++) {
|
||
|
|
st = s->streams[i];
|
||
|
|
if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (i == s->nb_streams) {
|
||
|
|
vst = avformat_new_stream(s, NULL);
|
||
|
|
if (!vst) {
|
||
|
|
res = AVERROR(ENOMEM);
|
||
|
|
goto bitmap_end;
|
||
|
|
}
|
||
|
|
vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
|
||
|
|
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
||
|
|
vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
|
||
|
|
avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
|
||
|
|
st = vst;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
|
||
|
|
goto bitmap_end;
|
||
|
|
if (!st->codecpar->width && !st->codecpar->height) {
|
||
|
|
st->codecpar->width = width;
|
||
|
|
st->codecpar->height = height;
|
||
|
|
} else {
|
||
|
|
ff_add_param_change(pkt, 0, 0, 0, width, height);
|
||
|
|
}
|
||
|
|
pkt->pos = pos;
|
||
|
|
pkt->stream_index = st->index;
|
||
|
|
|
||
|
|
if (linesize * height > pkt->size) {
|
||
|
|
res = AVERROR_INVALIDDATA;
|
||
|
|
goto bitmap_end;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (bmp_fmt) {
|
||
|
|
case 3:
|
||
|
|
pix_fmt = AV_PIX_FMT_PAL8;
|
||
|
|
for (i = 0; i < colormapsize; i++)
|
||
|
|
if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
|
||
|
|
else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
|
||
|
|
pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
|
||
|
|
if (!pal) {
|
||
|
|
res = AVERROR(ENOMEM);
|
||
|
|
goto bitmap_end;
|
||
|
|
}
|
||
|
|
memcpy(pal, colormap, AVPALETTE_SIZE);
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
pix_fmt = AV_PIX_FMT_RGB555;
|
||
|
|
break;
|
||
|
|
case 5:
|
||
|
|
pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
av_assert0(0);
|
||
|
|
}
|
||
|
|
if (st->codecpar->format != AV_PIX_FMT_NONE && st->codecpar->format != pix_fmt) {
|
||
|
|
av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
|
||
|
|
} else
|
||
|
|
st->codecpar->format = pix_fmt;
|
||
|
|
|
||
|
|
memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
|
||
|
|
|
||
|
|
res = pkt->size;
|
||
|
|
|
||
|
|
bitmap_end:
|
||
|
|
av_freep(&zbuf);
|
||
|
|
av_freep(&buf);
|
||
|
|
return res;
|
||
|
|
bitmap_end_skip:
|
||
|
|
av_freep(&zbuf);
|
||
|
|
av_freep(&buf);
|
||
|
|
#else
|
||
|
|
av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
|
||
|
|
#endif
|
||
|
|
} else if (tag == TAG_STREAMBLOCK) {
|
||
|
|
for (i = 0; i < s->nb_streams; i++) {
|
||
|
|
st = s->streams[i];
|
||
|
|
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
|
||
|
|
if (st->codecpar->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->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (i == s->nb_streams) {
|
||
|
|
vst = avformat_new_stream(s, NULL);
|
||
|
|
if (!vst)
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
|
||
|
|
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
||
|
|
vst->codecpar->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;
|
||
|
|
if (avio_read(pb, pkt->data, 4) != 4) {
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
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;
|
||
|
|
memset(pkt->data+pkt->size, 0, 4);
|
||
|
|
res = avio_read(pb, pkt->data, pkt->size);
|
||
|
|
} else {
|
||
|
|
res = avio_read(pb, pkt->data + 4, pkt->size - 4);
|
||
|
|
if (res >= 0)
|
||
|
|
res += 4;
|
||
|
|
}
|
||
|
|
if (res != pkt->size) {
|
||
|
|
if (res < 0) {
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
av_shrink_packet(pkt, res);
|
||
|
|
}
|
||
|
|
|
||
|
|
pkt->pos = pos;
|
||
|
|
pkt->stream_index = st->index;
|
||
|
|
return pkt->size;
|
||
|
|
} else {
|
||
|
|
av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
|
||
|
|
}
|
||
|
|
skip:
|
||
|
|
if(len<0)
|
||
|
|
av_log(s, AV_LOG_WARNING, "Clipping len %d\n", len);
|
||
|
|
len = FFMAX(0, len);
|
||
|
|
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);
|
||
|
|
avio_context_free(&s->zpb);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
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,
|
||
|
|
#if CONFIG_ZLIB
|
||
|
|
.read_close = swf_read_close,
|
||
|
|
#endif
|
||
|
|
};
|