| /* |
| * Smacker demuxer |
| * Copyright (c) 2006 Konstantin Shishkov |
| * |
| * 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 |
| */ |
| |
| /* |
| * Based on http://wiki.multimedia.cx/index.php?title=Smacker |
| */ |
| |
| #include <inttypes.h> |
| |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| #include "avio_internal.h" |
| #include "internal.h" |
| |
| #define SMACKER_PAL 0x01 |
| #define SMACKER_FLAG_RING_FRAME 0x01 |
| |
| enum SAudFlags { |
| SMK_AUD_PACKED = 0x80, |
| SMK_AUD_16BITS = 0x20, |
| SMK_AUD_STEREO = 0x10, |
| SMK_AUD_BINKAUD = 0x08, |
| SMK_AUD_USEDCT = 0x04 |
| }; |
| |
| typedef struct SmackerContext { |
| uint32_t frames; |
| /* frame info */ |
| uint32_t *frm_size; |
| uint8_t *frm_flags; |
| /* internal variables */ |
| int64_t next_frame_pos; |
| int cur_frame; |
| int videoindex; |
| int indexes[7]; |
| int duration_size[7]; |
| /* current frame for demuxing */ |
| uint32_t frame_size; |
| int flags; |
| int next_audio_index; |
| int new_palette; |
| uint8_t pal[768]; |
| int64_t aud_pts[7]; |
| } SmackerContext; |
| |
| /* palette used in Smacker */ |
| static const uint8_t smk_pal[64] = { |
| 0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C, |
| 0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C, |
| 0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D, |
| 0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D, |
| 0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E, |
| 0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE, |
| 0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF, |
| 0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF |
| }; |
| |
| |
| static int smacker_probe(const AVProbeData *p) |
| { |
| if ( AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '2') |
| && AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '4')) |
| return 0; |
| |
| if (AV_RL32(p->buf+4) > 32768U || AV_RL32(p->buf+8) > 32768U) |
| return AVPROBE_SCORE_MAX/4; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int smacker_read_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| SmackerContext *smk = s->priv_data; |
| AVStream *st; |
| AVCodecParameters *par; |
| uint32_t magic, width, height, flags, treesize; |
| int i, ret, pts_inc; |
| int tbase; |
| |
| /* read and check header */ |
| magic = avio_rl32(pb); |
| if (magic != MKTAG('S', 'M', 'K', '2') && magic != MKTAG('S', 'M', 'K', '4')) |
| return AVERROR_INVALIDDATA; |
| width = avio_rl32(pb); |
| height = avio_rl32(pb); |
| smk->frames = avio_rl32(pb); |
| pts_inc = avio_rl32(pb); |
| if (pts_inc > INT_MAX / 100) { |
| av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", pts_inc); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| flags = avio_rl32(pb); |
| if (flags & SMACKER_FLAG_RING_FRAME) |
| smk->frames++; |
| if (smk->frames > 0xFFFFFF) { |
| av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| avio_skip(pb, 28); /* Unused audio related data */ |
| |
| treesize = avio_rl32(pb); |
| if (treesize >= UINT_MAX/4) { |
| // treesize + 16 must not overflow (this check is probably redundant) |
| av_log(s, AV_LOG_ERROR, "treesize too large\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| smk->videoindex = st->index; |
| /* Smacker uses 100000 as internal timebase */ |
| if (pts_inc < 0) |
| pts_inc = -pts_inc; |
| else |
| pts_inc *= 100; |
| tbase = 100000; |
| av_reduce(&tbase, &pts_inc, tbase, pts_inc, (1UL << 31) - 1); |
| avpriv_set_pts_info(st, 33, pts_inc, tbase); |
| st->duration = smk->frames; |
| |
| /* init video codec */ |
| par = st->codecpar; |
| par->width = width; |
| par->height = height; |
| par->format = AV_PIX_FMT_PAL8; |
| par->codec_type = AVMEDIA_TYPE_VIDEO; |
| par->codec_id = AV_CODEC_ID_SMACKVIDEO; |
| par->codec_tag = magic; |
| |
| if ((ret = ff_alloc_extradata(par, treesize + 16)) < 0) { |
| av_log(s, AV_LOG_ERROR, |
| "Cannot allocate %"PRIu32" bytes of extradata\n", |
| treesize + 16); |
| return ret; |
| } |
| if ((ret = ffio_read_size(pb, par->extradata, 16)) < 0) |
| return ret; |
| |
| /* handle possible audio streams */ |
| for (i = 0; i < 7; i++) { |
| uint32_t rate = avio_rl24(pb); |
| uint8_t aflag = avio_r8(pb); |
| |
| smk->indexes[i] = -1; |
| |
| if (rate) { |
| AVStream *ast = avformat_new_stream(s, NULL); |
| AVCodecParameters *par; |
| if (!ast) |
| return AVERROR(ENOMEM); |
| |
| smk->indexes[i] = ast->index; |
| par = ast->codecpar; |
| par->codec_type = AVMEDIA_TYPE_AUDIO; |
| if (aflag & SMK_AUD_BINKAUD) { |
| par->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT; |
| } else if (aflag & SMK_AUD_USEDCT) { |
| par->codec_id = AV_CODEC_ID_BINKAUDIO_DCT; |
| } else if (aflag & SMK_AUD_PACKED) { |
| par->codec_id = AV_CODEC_ID_SMACKAUDIO; |
| par->codec_tag = MKTAG('S', 'M', 'K', 'A'); |
| } else { |
| par->codec_id = AV_CODEC_ID_PCM_U8; |
| } |
| if (aflag & SMK_AUD_STEREO) { |
| par->channels = 2; |
| par->channel_layout = AV_CH_LAYOUT_STEREO; |
| } else { |
| par->channels = 1; |
| par->channel_layout = AV_CH_LAYOUT_MONO; |
| } |
| par->sample_rate = rate; |
| par->bits_per_coded_sample = (aflag & SMK_AUD_16BITS) ? 16 : 8; |
| if (par->bits_per_coded_sample == 16 && |
| par->codec_id == AV_CODEC_ID_PCM_U8) |
| par->codec_id = AV_CODEC_ID_PCM_S16LE; |
| else |
| smk->duration_size[i] = 4; |
| avpriv_set_pts_info(ast, 64, 1, par->sample_rate * par->channels |
| * par->bits_per_coded_sample / 8); |
| } |
| } |
| |
| avio_rl32(pb); /* padding */ |
| |
| /* setup data */ |
| st->priv_data = av_malloc_array(smk->frames, sizeof(*smk->frm_size) + |
| sizeof(*smk->frm_flags)); |
| if (!st->priv_data) |
| return AVERROR(ENOMEM); |
| smk->frm_size = st->priv_data; |
| smk->frm_flags = (void*)(smk->frm_size + smk->frames); |
| |
| /* read frame info */ |
| for (i = 0; i < smk->frames; i++) { |
| smk->frm_size[i] = avio_rl32(pb); |
| } |
| if ((ret = ffio_read_size(pb, smk->frm_flags, smk->frames)) < 0 || |
| /* load trees to extradata, they will be unpacked by decoder */ |
| (ret = ffio_read_size(pb, par->extradata + 16, |
| par->extradata_size - 16)) < 0) { |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| SmackerContext *smk = s->priv_data; |
| int flags; |
| int ret; |
| |
| if (avio_feof(s->pb) || smk->cur_frame >= smk->frames) |
| return AVERROR_EOF; |
| |
| /* if we demuxed all streams, pass another frame */ |
| if (!smk->next_audio_index) { |
| smk->frame_size = smk->frm_size[smk->cur_frame] & (~3); |
| smk->next_frame_pos = avio_tell(s->pb) + smk->frame_size; |
| flags = smk->frm_flags[smk->cur_frame]; |
| smk->flags = flags >> 1; |
| /* handle palette change event */ |
| if (flags & SMACKER_PAL) { |
| int size, sz, t, off, j, pos; |
| uint8_t *pal = smk->pal; |
| uint8_t oldpal[768]; |
| |
| memcpy(oldpal, pal, 768); |
| size = avio_r8(s->pb); |
| size = size * 4; |
| if (size > smk->frame_size) { |
| ret = AVERROR_INVALIDDATA; |
| goto next_frame; |
| } |
| smk->frame_size -= size--; |
| sz = 0; |
| pos = avio_tell(s->pb) + size; |
| while (sz < 256) { |
| t = avio_r8(s->pb); |
| if (t & 0x80) { /* skip palette entries */ |
| sz += (t & 0x7F) + 1; |
| pal += ((t & 0x7F) + 1) * 3; |
| } else if (t & 0x40) { /* copy with offset */ |
| off = avio_r8(s->pb); |
| j = (t & 0x3F) + 1; |
| if (off + j > 0x100) { |
| av_log(s, AV_LOG_ERROR, |
| "Invalid palette update, offset=%d length=%d extends beyond palette size\n", |
| off, j); |
| ret = AVERROR_INVALIDDATA; |
| goto next_frame; |
| } |
| off *= 3; |
| while (j-- && sz < 256) { |
| *pal++ = oldpal[off + 0]; |
| *pal++ = oldpal[off + 1]; |
| *pal++ = oldpal[off + 2]; |
| sz++; |
| off += 3; |
| } |
| } else { /* new entries */ |
| *pal++ = smk_pal[t]; |
| *pal++ = smk_pal[avio_r8(s->pb) & 0x3F]; |
| *pal++ = smk_pal[avio_r8(s->pb) & 0x3F]; |
| sz++; |
| } |
| } |
| avio_seek(s->pb, pos, 0); |
| smk->new_palette = 1; |
| } |
| } |
| |
| for (int i = smk->next_audio_index; i < 7; i++) { |
| if (smk->flags & (1 << i)) { |
| uint32_t size; |
| |
| size = avio_rl32(s->pb); |
| if ((int)size < 4 + smk->duration_size[i] || size > smk->frame_size) { |
| av_log(s, AV_LOG_ERROR, "Invalid audio part size\n"); |
| ret = AVERROR_INVALIDDATA; |
| goto next_frame; |
| } |
| smk->frame_size -= size; |
| size -= 4; |
| |
| if (smk->indexes[i] < 0 || |
| s->streams[smk->indexes[i]]->discard >= AVDISCARD_ALL) { |
| smk->aud_pts[i] += smk->duration_size[i] ? avio_rl32(s->pb) |
| : size; |
| avio_skip(s->pb, size - smk->duration_size[i]); |
| continue; |
| } |
| if ((ret = av_get_packet(s->pb, pkt, size)) != size) { |
| ret = ret < 0 ? ret : AVERROR_INVALIDDATA; |
| goto next_frame; |
| } |
| pkt->stream_index = smk->indexes[i]; |
| pkt->pts = smk->aud_pts[i]; |
| pkt->duration = smk->duration_size[i] ? AV_RL32(pkt->data) |
| : size; |
| smk->aud_pts[i] += pkt->duration; |
| smk->next_audio_index = i + 1; |
| return 0; |
| } |
| } |
| |
| if (s->streams[smk->videoindex]->discard >= AVDISCARD_ALL) { |
| ret = FFERROR_REDO; |
| goto next_frame; |
| } |
| if (smk->frame_size >= INT_MAX/2) { |
| ret = AVERROR_INVALIDDATA; |
| goto next_frame; |
| } |
| if ((ret = av_new_packet(pkt, smk->frame_size + 769)) < 0) |
| goto next_frame; |
| flags = smk->new_palette; |
| if (smk->frm_size[smk->cur_frame] & 1) |
| flags |= 2; |
| pkt->data[0] = flags; |
| memcpy(pkt->data + 1, smk->pal, 768); |
| ret = ffio_read_size(s->pb, pkt->data + 769, smk->frame_size); |
| if (ret < 0) |
| goto next_frame; |
| pkt->stream_index = smk->videoindex; |
| pkt->pts = smk->cur_frame; |
| smk->next_audio_index = 0; |
| smk->new_palette = 0; |
| smk->cur_frame++; |
| |
| return 0; |
| next_frame: |
| avio_seek(s->pb, smk->next_frame_pos, SEEK_SET); |
| smk->next_audio_index = 0; |
| smk->cur_frame++; |
| return ret; |
| } |
| |
| static int smacker_read_seek(AVFormatContext *s, int stream_index, |
| int64_t timestamp, int flags) |
| { |
| SmackerContext *smk = s->priv_data; |
| int64_t ret; |
| |
| /* only rewinding to start is supported */ |
| if (timestamp != 0) { |
| av_log(s, AV_LOG_ERROR, |
| "Random seeks are not supported (can only seek to start).\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| if ((ret = avio_seek(s->pb, s->internal->data_offset, SEEK_SET)) < 0) |
| return ret; |
| |
| smk->cur_frame = 0; |
| smk->next_audio_index = 0; |
| smk->new_palette = 0; |
| memset(smk->pal, 0, sizeof(smk->pal)); |
| memset(smk->aud_pts, 0, sizeof(smk->aud_pts)); |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_smacker_demuxer = { |
| .name = "smk", |
| .long_name = NULL_IF_CONFIG_SMALL("Smacker"), |
| .priv_data_size = sizeof(SmackerContext), |
| .read_probe = smacker_probe, |
| .read_header = smacker_read_header, |
| .read_packet = smacker_read_packet, |
| .read_seek = smacker_read_seek, |
| }; |
