yading@11: /*
yading@11:  * Flash Compatible Streaming Format demuxer
yading@11:  * Copyright (c) 2000 Fabrice Bellard
yading@11:  * Copyright (c) 2003 Tinic Uro
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/avassert.h"
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/imgutils.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "swf.h"
yading@11: 
yading@11: static const AVCodecTag swf_audio_codec_tags[] = {
yading@11:     { AV_CODEC_ID_PCM_S16LE,  0x00 },
yading@11:     { AV_CODEC_ID_ADPCM_SWF,  0x01 },
yading@11:     { AV_CODEC_ID_MP3,        0x02 },
yading@11:     { AV_CODEC_ID_PCM_S16LE,  0x03 },
yading@11: //  { AV_CODEC_ID_NELLYMOSER, 0x06 },
yading@11:     { AV_CODEC_ID_NONE,          0 },
yading@11: };
yading@11: 
yading@11: static int get_swf_tag(AVIOContext *pb, int *len_ptr)
yading@11: {
yading@11:     int tag, len;
yading@11: 
yading@11:     if (url_feof(pb))
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     tag = avio_rl16(pb);
yading@11:     len = tag & 0x3f;
yading@11:     tag = tag >> 6;
yading@11:     if (len == 0x3f) {
yading@11:         len = avio_rl32(pb);
yading@11:     }
yading@11:     *len_ptr = len;
yading@11:     return tag;
yading@11: }
yading@11: 
yading@11: 
yading@11: static int swf_probe(AVProbeData *p)
yading@11: {
yading@11:     /* check file header */
yading@11:     if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' &&
yading@11:         p->buf[2] == 'S')
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     else
yading@11:         return 0;
yading@11: }
yading@11: 
yading@11: #if CONFIG_ZLIB
yading@11: static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
yading@11: {
yading@11:     AVFormatContext *s = opaque;
yading@11:     SWFContext *swf = s->priv_data;
yading@11:     z_stream *z = &swf->zstream;
yading@11:     int ret;
yading@11: 
yading@11: retry:
yading@11:     if (!z->avail_in) {
yading@11:         int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
yading@11:         if (n < 0)
yading@11:             return n;
yading@11:         z->next_in  = swf->zbuf_in;
yading@11:         z->avail_in = n;
yading@11:     }
yading@11: 
yading@11:     z->next_out  = buf;
yading@11:     z->avail_out = buf_size;
yading@11: 
yading@11:     ret = inflate(z, Z_NO_FLUSH);
yading@11:     if (ret < 0)
yading@11:         return AVERROR(EINVAL);
yading@11:     if (ret == Z_STREAM_END)
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     if (buf_size - z->avail_out == 0)
yading@11:         goto retry;
yading@11: 
yading@11:     return buf_size - z->avail_out;
yading@11: }
yading@11: #endif
yading@11: 
yading@11: static int swf_read_header(AVFormatContext *s)
yading@11: {
yading@11:     SWFContext *swf = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int nbits, len, tag;
yading@11: 
yading@11:     tag = avio_rb32(pb) & 0xffffff00;
yading@11:     avio_rl32(pb);
yading@11: 
yading@11:     if (tag == MKBETAG('C', 'W', 'S', 0)) {
yading@11:         av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
yading@11: #if CONFIG_ZLIB
yading@11:         swf->zbuf_in  = av_malloc(ZBUF_SIZE);
yading@11:         swf->zbuf_out = av_malloc(ZBUF_SIZE);
yading@11:         swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
yading@11:                                       zlib_refill, NULL, NULL);
yading@11:         if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
yading@11:             return AVERROR(ENOMEM);
yading@11:         swf->zpb->seekable = 0;
yading@11:         if (inflateInit(&swf->zstream) != Z_OK) {
yading@11:             av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11:         pb = swf->zpb;
yading@11: #else
yading@11:         av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
yading@11:         return AVERROR(EIO);
yading@11: #endif
yading@11:     } else if (tag != MKBETAG('F', 'W', 'S', 0))
yading@11:         return AVERROR(EIO);
yading@11:     /* skip rectangle size */
yading@11:     nbits = avio_r8(pb) >> 3;
yading@11:     len = (4 * nbits - 3 + 7) / 8;
yading@11:     avio_skip(pb, len);
yading@11:     swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
yading@11:     avio_rl16(pb); /* frame count */
yading@11: 
yading@11:     swf->samples_per_frame = 0;
yading@11:     s->ctx_flags |= AVFMTCTX_NOHEADER;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
yading@11: {
yading@11:     int sample_rate_code, sample_size_code;
yading@11:     AVStream *ast = avformat_new_stream(s, NULL);
yading@11:     if (!ast)
yading@11:         return NULL;
yading@11:     ast->id = id;
yading@11:     if (info & 1) {
yading@11:         ast->codec->channels       = 2;
yading@11:         ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
yading@11:     } else {
yading@11:         ast->codec->channels       = 1;
yading@11:         ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:     }
yading@11:     ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:     ast->codec->codec_id   = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
yading@11:     ast->need_parsing = AVSTREAM_PARSE_FULL;
yading@11:     sample_rate_code = info>>2 & 3;
yading@11:     sample_size_code = info>>1 & 1;
yading@11:     if (!sample_size_code && ast->codec->codec_id == AV_CODEC_ID_PCM_S16LE)
yading@11:         ast->codec->codec_id = AV_CODEC_ID_PCM_U8;
yading@11:     ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
yading@11:     avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
yading@11:     return ast;
yading@11: }
yading@11: 
yading@11: static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     SWFContext *swf = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVStream *vst = NULL, *ast = NULL, *st = 0;
yading@11:     int tag, len, i, frame, v, res;
yading@11: 
yading@11: #if CONFIG_ZLIB
yading@11:     if (swf->zpb)
yading@11:         pb = swf->zpb;
yading@11: #endif
yading@11: 
yading@11:     for(;;) {
yading@11:         uint64_t pos = avio_tell(pb);
yading@11:         tag = get_swf_tag(pb, &len);
yading@11:         if (tag < 0)
yading@11:             return tag;
yading@11:         if (len < 0) {
yading@11:             av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:         if (tag == TAG_VIDEOSTREAM) {
yading@11:             int ch_id = avio_rl16(pb);
yading@11:             len -= 2;
yading@11: 
yading@11:             for (i=0; i<s->nb_streams; i++) {
yading@11:                 st = s->streams[i];
yading@11:                 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
yading@11:                     goto skip;
yading@11:             }
yading@11: 
yading@11:             avio_rl16(pb);
yading@11:             avio_rl16(pb);
yading@11:             avio_rl16(pb);
yading@11:             avio_r8(pb);
yading@11:             /* Check for FLV1 */
yading@11:             vst = avformat_new_stream(s, NULL);
yading@11:             if (!vst)
yading@11:                 return AVERROR(ENOMEM);
yading@11:             vst->id = ch_id;
yading@11:             vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:             vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
yading@11:             avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
yading@11:             len -= 8;
yading@11:         } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
yading@11:             /* streaming found */
yading@11: 
yading@11:             for (i=0; i<s->nb_streams; i++) {
yading@11:                 st = s->streams[i];
yading@11:                 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
yading@11:                     goto skip;
yading@11:             }
yading@11: 
yading@11:             avio_r8(pb);
yading@11:             v = avio_r8(pb);
yading@11:             swf->samples_per_frame = avio_rl16(pb);
yading@11:             ast = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
yading@11:             if (!ast)
yading@11:                 return AVERROR(ENOMEM);
yading@11:             len -= 4;
yading@11:         } else if (tag == TAG_DEFINESOUND) {
yading@11:             /* audio stream */
yading@11:             int ch_id = avio_rl16(pb);
yading@11: 
yading@11:             for (i=0; i<s->nb_streams; i++) {
yading@11:                 st = s->streams[i];
yading@11:                 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
yading@11:                     goto skip;
yading@11:             }
yading@11: 
yading@11:             // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
yading@11:             // these are smaller audio streams in DEFINESOUND tags, but it's technically
yading@11:             // possible they could be huge. Break it up into multiple packets if it's big.
yading@11:             v = avio_r8(pb);
yading@11:             ast = create_new_audio_stream(s, ch_id, v);
yading@11:             if (!ast)
yading@11:                 return AVERROR(ENOMEM);
yading@11:             ast->duration = avio_rl32(pb); // number of samples
yading@11:             if (((v>>4) & 15) == 2) { // MP3 sound data record
yading@11:                 ast->skip_samples = avio_rl16(pb);
yading@11:                 len -= 2;
yading@11:             }
yading@11:             len -= 7;
yading@11:             if ((res = av_get_packet(pb, pkt, len)) < 0)
yading@11:                 return res;
yading@11:             pkt->pos = pos;
yading@11:             pkt->stream_index = ast->index;
yading@11:             return pkt->size;
yading@11:         } else if (tag == TAG_VIDEOFRAME) {
yading@11:             int ch_id = avio_rl16(pb);
yading@11:             len -= 2;
yading@11:             for(i=0; i<s->nb_streams; i++) {
yading@11:                 st = s->streams[i];
yading@11:                 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
yading@11:                     frame = avio_rl16(pb);
yading@11:                     len -= 2;
yading@11:                     if (len <= 0)
yading@11:                         goto skip;
yading@11:                     if ((res = av_get_packet(pb, pkt, len)) < 0)
yading@11:                         return res;
yading@11:                     pkt->pos = pos;
yading@11:                     pkt->pts = frame;
yading@11:                     pkt->stream_index = st->index;
yading@11:                     return pkt->size;
yading@11:                 }
yading@11:             }
yading@11:         } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
yading@11: #if CONFIG_ZLIB
yading@11:             long out_len;
yading@11:             uint8_t *buf = NULL, *zbuf = NULL, *pal;
yading@11:             uint32_t colormap[AVPALETTE_COUNT] = {0};
yading@11:             const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
yading@11:             const int colormapbpp = 3 + alpha_bmp;
yading@11:             int linesize, colormapsize = 0;
yading@11: 
yading@11:             const int ch_id   = avio_rl16(pb);
yading@11:             const int bmp_fmt = avio_r8(pb);
yading@11:             const int width   = avio_rl16(pb);
yading@11:             const int height  = avio_rl16(pb);
yading@11: 
yading@11:             len -= 2+1+2+2;
yading@11: 
yading@11:             switch (bmp_fmt) {
yading@11:             case 3: // PAL-8
yading@11:                 linesize = width;
yading@11:                 colormapsize = avio_r8(pb) + 1;
yading@11:                 len--;
yading@11:                 break;
yading@11:             case 4: // RGB15
yading@11:                 linesize = width * 2;
yading@11:                 break;
yading@11:             case 5: // RGB24 (0RGB)
yading@11:                 linesize = width * 4;
yading@11:                 break;
yading@11:             default:
yading@11:                 av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
yading@11:                 goto bitmap_end_skip;
yading@11:             }
yading@11: 
yading@11:             linesize = FFALIGN(linesize, 4);
yading@11: 
yading@11:             if (av_image_check_size(width, height, 0, s) < 0 ||
yading@11:                 linesize >= INT_MAX / height ||
yading@11:                 linesize * height >= INT_MAX - colormapsize * colormapbpp) {
yading@11:                 av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
yading@11:                 goto bitmap_end_skip;
yading@11:             }
yading@11: 
yading@11:             out_len = colormapsize * colormapbpp + linesize * height;
yading@11: 
yading@11:             av_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
yading@11:                     ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
yading@11: 
yading@11:             zbuf = av_malloc(len);
yading@11:             buf  = av_malloc(out_len);
yading@11:             if (!zbuf || !buf) {
yading@11:                 res = AVERROR(ENOMEM);
yading@11:                 goto bitmap_end;
yading@11:             }
yading@11: 
yading@11:             len = avio_read(pb, zbuf, len);
yading@11:             if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
yading@11:                 av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
yading@11:                 goto bitmap_end_skip;
yading@11:             }
yading@11: 
yading@11:             for (i = 0; i < s->nb_streams; i++) {
yading@11:                 st = s->streams[i];
yading@11:                 if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
yading@11:                     break;
yading@11:             }
yading@11:             if (i == s->nb_streams) {
yading@11:                 vst = avformat_new_stream(s, NULL);
yading@11:                 if (!vst) {
yading@11:                     res = AVERROR(ENOMEM);
yading@11:                     goto bitmap_end;
yading@11:                 }
yading@11:                 vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
yading@11:                 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:                 vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
yading@11:                 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
yading@11:                 st = vst;
yading@11:             }
yading@11:             st->codec->width  = width;
yading@11:             st->codec->height = height;
yading@11: 
yading@11:             if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
yading@11:                 goto bitmap_end;
yading@11:             pkt->pos = pos;
yading@11:             pkt->stream_index = st->index;
yading@11: 
yading@11:             switch (bmp_fmt) {
yading@11:             case 3:
yading@11:                 st->codec->pix_fmt = AV_PIX_FMT_PAL8;
yading@11:                 for (i = 0; i < colormapsize; i++)
yading@11:                     if (alpha_bmp)  colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
yading@11:                     else            colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
yading@11:                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
yading@11:                 if (!pal) {
yading@11:                     res = AVERROR(ENOMEM);
yading@11:                     goto bitmap_end;
yading@11:                 }
yading@11:                 memcpy(pal, colormap, AVPALETTE_SIZE);
yading@11:                 break;
yading@11:             case 4:
yading@11:                 st->codec->pix_fmt = AV_PIX_FMT_RGB555;
yading@11:                 break;
yading@11:             case 5:
yading@11:                 st->codec->pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
yading@11:                 break;
yading@11:             default:
yading@11:                 av_assert0(0);
yading@11:             }
yading@11: 
yading@11:             if (linesize * height > pkt->size) {
yading@11:                 res = AVERROR_INVALIDDATA;
yading@11:                 goto bitmap_end;
yading@11:             }
yading@11:             memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
yading@11: 
yading@11:             res = pkt->size;
yading@11: 
yading@11: bitmap_end:
yading@11:             av_freep(&zbuf);
yading@11:             av_freep(&buf);
yading@11:             return res;
yading@11: bitmap_end_skip:
yading@11:             av_freep(&zbuf);
yading@11:             av_freep(&buf);
yading@11: #else
yading@11:             av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
yading@11: #endif
yading@11:         } else if (tag == TAG_STREAMBLOCK) {
yading@11:             for (i = 0; i < s->nb_streams; i++) {
yading@11:                 st = s->streams[i];
yading@11:                 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
yading@11:                     if (st->codec->codec_id == AV_CODEC_ID_MP3) {
yading@11:                         avio_skip(pb, 4);
yading@11:                         len -= 4;
yading@11:                         if (len <= 0)
yading@11:                             goto skip;
yading@11:                         if ((res = av_get_packet(pb, pkt, len)) < 0)
yading@11:                             return res;
yading@11:                     } else { // ADPCM, PCM
yading@11:                         if (len <= 0)
yading@11:                             goto skip;
yading@11:                         if ((res = av_get_packet(pb, pkt, len)) < 0)
yading@11:                             return res;
yading@11:                     }
yading@11:                     pkt->pos          = pos;
yading@11:                     pkt->stream_index = st->index;
yading@11:                     return pkt->size;
yading@11:                 }
yading@11:             }
yading@11:         } else if (tag == TAG_JPEG2) {
yading@11:             for (i=0; i<s->nb_streams; i++) {
yading@11:                 st = s->streams[i];
yading@11:                 if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
yading@11:                     break;
yading@11:             }
yading@11:             if (i == s->nb_streams) {
yading@11:                 vst = avformat_new_stream(s, NULL);
yading@11:                 if (!vst)
yading@11:                     return AVERROR(ENOMEM);
yading@11:                 vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
yading@11:                 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:                 vst->codec->codec_id = AV_CODEC_ID_MJPEG;
yading@11:                 avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
yading@11:                 st = vst;
yading@11:             }
yading@11:             avio_rl16(pb); /* BITMAP_ID */
yading@11:             len -= 2;
yading@11:             if (len < 4)
yading@11:                 goto skip;
yading@11:             if ((res = av_new_packet(pkt, len)) < 0)
yading@11:                 return res;
yading@11:             avio_read(pb, pkt->data, 4);
yading@11:             if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
yading@11:                 AV_RB32(pkt->data) == 0xffd9ffd8) {
yading@11:                 /* old SWF files containing SOI/EOI as data start */
yading@11:                 /* files created by swink have reversed tag */
yading@11:                 pkt->size -= 4;
yading@11:                 avio_read(pb, pkt->data, pkt->size);
yading@11:             } else {
yading@11:                 avio_read(pb, pkt->data + 4, pkt->size - 4);
yading@11:             }
yading@11:             pkt->pos = pos;
yading@11:             pkt->stream_index = st->index;
yading@11:             return pkt->size;
yading@11:         } else {
yading@11:             av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
yading@11:         }
yading@11:     skip:
yading@11:         if(len<0)
yading@11:             av_log(s, AV_LOG_WARNING, "Cliping len %d\n", len);
yading@11:         len = FFMAX(0, len);
yading@11:         avio_skip(pb, len);
yading@11:     }
yading@11: }
yading@11: 
yading@11: #if CONFIG_ZLIB
yading@11: static av_cold int swf_read_close(AVFormatContext *avctx)
yading@11: {
yading@11:     SWFContext *s = avctx->priv_data;
yading@11:     inflateEnd(&s->zstream);
yading@11:     av_freep(&s->zbuf_in);
yading@11:     av_freep(&s->zbuf_out);
yading@11:     av_freep(&s->zpb);
yading@11:     return 0;
yading@11: }
yading@11: #endif
yading@11: 
yading@11: AVInputFormat ff_swf_demuxer = {
yading@11:     .name           = "swf",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
yading@11:     .priv_data_size = sizeof(SWFContext),
yading@11:     .read_probe     = swf_probe,
yading@11:     .read_header    = swf_read_header,
yading@11:     .read_packet    = swf_read_packet,
yading@11: #if CONFIG_ZLIB
yading@11:     .read_close     = swf_read_close,
yading@11: #endif
yading@11: };