diff options
Diffstat (limited to 'ffmpeg/libavformat/swfdec.c')
| -rw-r--r-- | ffmpeg/libavformat/swfdec.c | 489 |
1 files changed, 489 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/swfdec.c b/ffmpeg/libavformat/swfdec.c new file mode 100644 index 0000000..54e0f6d --- /dev/null +++ b/ffmpeg/libavformat/swfdec.c @@ -0,0 +1,489 @@ +/* + * 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/avassert.h" +#include "libavutil/channel_layout.h" +#include "libavutil/imgutils.h" +#include "libavutil/intreadwrite.h" +#include "swf.h" + +static const AVCodecTag swf_audio_codec_tags[] = { + { AV_CODEC_ID_PCM_S16LE, 0x00 }, + { AV_CODEC_ID_ADPCM_SWF, 0x01 }, + { AV_CODEC_ID_MP3, 0x02 }, + { AV_CODEC_ID_PCM_S16LE, 0x03 }, +// { AV_CODEC_ID_NELLYMOSER, 0x06 }, + { AV_CODEC_ID_NONE, 0 }, +}; + +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); + } + *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 AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info) +{ + int sample_rate_code, sample_size_code; + AVStream *ast = avformat_new_stream(s, NULL); + if (!ast) + return NULL; + ast->id = id; + if (info & 1) { + ast->codec->channels = 2; + ast->codec->channel_layout = AV_CH_LAYOUT_STEREO; + } else { + ast->codec->channels = 1; + ast->codec->channel_layout = AV_CH_LAYOUT_MONO; + } + ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; + ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15); + ast->need_parsing = AVSTREAM_PARSE_FULL; + sample_rate_code = info>>2 & 3; + sample_size_code = info>>1 & 1; + if (!sample_size_code && ast->codec->codec_id == AV_CODEC_ID_PCM_S16LE) + ast->codec->codec_id = AV_CODEC_ID_PCM_U8; + ast->codec->sample_rate = 44100 >> (3 - sample_rate_code); + avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); + return ast; +} + +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 (len < 0) { + av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len); + return AVERROR_INVALIDDATA; + } + 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 AVERROR(ENOMEM); + vst->id = ch_id; + vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; + vst->codec->codec_id = ff_codec_get_id(ff_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 */ + + 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 = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */ + if (!ast) + return AVERROR(ENOMEM); + len -= 4; + } else if (tag == TAG_DEFINESOUND) { + /* audio stream */ + int ch_id = avio_rl16(pb); + + for (i=0; i<s->nb_streams; i++) { + st = s->streams[i]; + if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id) + goto skip; + } + + // FIXME: The entire audio stream is stored in a single chunk/tag. Normally, + // these are smaller audio streams in DEFINESOUND tags, but it's technically + // possible they could be huge. Break it up into multiple packets if it's big. + v = avio_r8(pb); + ast = create_new_audio_stream(s, ch_id, v); + if (!ast) + return AVERROR(ENOMEM); + ast->duration = avio_rl32(pb); // number of samples + if (((v>>4) & 15) == 2) { // MP3 sound data record + ast->skip_samples = avio_rl16(pb); + len -= 2; + } + len -= 7; + if ((res = av_get_packet(pb, pkt, len)) < 0) + return res; + pkt->pos = pos; + pkt->stream_index = ast->index; + return pkt->size; + } 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); + len -= 2; + if (len <= 0) + goto skip; + if ((res = av_get_packet(pb, pkt, len)) < 0) + return res; + pkt->pos = pos; + pkt->pts = frame; + pkt->stream_index = st->index; + return pkt->size; + } + } + } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) { +#if CONFIG_ZLIB + long out_len; + uint8_t *buf = NULL, *zbuf = NULL, *pal; + uint32_t colormap[AVPALETTE_COUNT] = {0}; + const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2; + const int colormapbpp = 3 + alpha_bmp; + int linesize, colormapsize = 0; + + const int ch_id = avio_rl16(pb); + const int bmp_fmt = avio_r8(pb); + const int width = avio_rl16(pb); + const int height = avio_rl16(pb); + + len -= 2+1+2+2; + + switch (bmp_fmt) { + case 3: // PAL-8 + linesize = width; + colormapsize = avio_r8(pb) + 1; + len--; + break; + case 4: // RGB15 + linesize = width * 2; + break; + case 5: // RGB24 (0RGB) + linesize = width * 4; + break; + default: + av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt); + goto bitmap_end_skip; + } + + linesize = FFALIGN(linesize, 4); + + if (av_image_check_size(width, height, 0, s) < 0 || + linesize >= INT_MAX / height || + linesize * height >= INT_MAX - colormapsize * colormapbpp) { + av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height); + goto bitmap_end_skip; + } + + out_len = colormapsize * colormapbpp + linesize * height; + + av_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->codec->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->codec->codec_type = AVMEDIA_TYPE_VIDEO; + vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO; + avpriv_set_pts_info(vst, 64, 256, swf->frame_rate); + st = vst; + } + st->codec->width = width; + st->codec->height = height; + + if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0) + goto bitmap_end; + pkt->pos = pos; + pkt->stream_index = st->index; + + switch (bmp_fmt) { + case 3: + st->codec->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: + st->codec->pix_fmt = AV_PIX_FMT_RGB555; + break; + case 5: + st->codec->pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB; + break; + default: + av_assert0(0); + } + + if (linesize * height > pkt->size) { + res = AVERROR_INVALIDDATA; + goto bitmap_end; + } + 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->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) { + if (st->codec->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->codec->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->codec->codec_type = AVMEDIA_TYPE_VIDEO; + vst->codec->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; + 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; + } else { + av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag); + } + skip: + if(len<0) + av_log(s, AV_LOG_WARNING, "Cliping 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); + av_freep(&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 +}; |