| /* |
| * 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 "libavutil/bswap.h" |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| |
| #define SMACKER_PAL 0x01 |
| #define SMACKER_FLAG_RING_FRAME 0x01 |
| |
| enum SAudFlags { |
| SMK_AUD_PACKED = 0x80000000, |
| SMK_AUD_16BITS = 0x20000000, |
| SMK_AUD_STEREO = 0x10000000, |
| SMK_AUD_BINKAUD = 0x08000000, |
| SMK_AUD_USEDCT = 0x04000000 |
| }; |
| |
| typedef struct SmackerContext { |
| /* Smacker file header */ |
| uint32_t magic; |
| uint32_t width, height; |
| uint32_t frames; |
| int pts_inc; |
| uint32_t flags; |
| uint32_t audio[7]; |
| uint32_t treesize; |
| uint32_t mmap_size, mclr_size, full_size, type_size; |
| uint32_t rates[7]; |
| uint32_t pad; |
| /* frame info */ |
| uint32_t *frm_size; |
| uint8_t *frm_flags; |
| /* internal variables */ |
| int cur_frame; |
| int is_ver4; |
| int64_t cur_pts; |
| /* current frame for demuxing */ |
| uint8_t pal[768]; |
| int indexes[7]; |
| int videoindex; |
| uint8_t *bufs[7]; |
| int buf_sizes[7]; |
| int stream_id[7]; |
| int curstream; |
| int64_t nextpos; |
| int64_t aud_pts[7]; |
| } SmackerContext; |
| |
| typedef struct SmackerFrame { |
| int64_t pts; |
| int stream; |
| } SmackerFrame; |
| |
| /* 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(AVProbeData *p) |
| { |
| if(p->buf[0] == 'S' && p->buf[1] == 'M' && p->buf[2] == 'K' |
| && (p->buf[3] == '2' || p->buf[3] == '4')) |
| return AVPROBE_SCORE_MAX; |
| else |
| return 0; |
| } |
| |
| static int smacker_read_header(AVFormatContext *s, AVFormatParameters *ap) |
| { |
| ByteIOContext *pb = s->pb; |
| SmackerContext *smk = s->priv_data; |
| AVStream *st, *ast[7]; |
| int i, ret; |
| int tbase; |
| |
| /* read and check header */ |
| smk->magic = get_le32(pb); |
| if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4')) |
| return -1; |
| smk->width = get_le32(pb); |
| smk->height = get_le32(pb); |
| smk->frames = get_le32(pb); |
| smk->pts_inc = (int32_t)get_le32(pb); |
| smk->flags = get_le32(pb); |
| if(smk->flags & SMACKER_FLAG_RING_FRAME) |
| smk->frames++; |
| for(i = 0; i < 7; i++) |
| smk->audio[i] = get_le32(pb); |
| smk->treesize = get_le32(pb); |
| |
| if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant) |
| av_log(s, AV_LOG_ERROR, "treesize too large\n"); |
| return -1; |
| } |
| |
| //FIXME remove extradata "rebuilding" |
| smk->mmap_size = get_le32(pb); |
| smk->mclr_size = get_le32(pb); |
| smk->full_size = get_le32(pb); |
| smk->type_size = get_le32(pb); |
| for(i = 0; i < 7; i++) |
| smk->rates[i] = get_le32(pb); |
| smk->pad = get_le32(pb); |
| /* setup data */ |
| if(smk->frames > 0xFFFFFF) { |
| av_log(s, AV_LOG_ERROR, "Too many frames: %i\n", smk->frames); |
| return -1; |
| } |
| smk->frm_size = av_malloc(smk->frames * 4); |
| smk->frm_flags = av_malloc(smk->frames); |
| |
| smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2')); |
| |
| /* read frame info */ |
| for(i = 0; i < smk->frames; i++) { |
| smk->frm_size[i] = get_le32(pb); |
| } |
| for(i = 0; i < smk->frames; i++) { |
| smk->frm_flags[i] = get_byte(pb); |
| } |
| |
| /* init video codec */ |
| st = av_new_stream(s, 0); |
| if (!st) |
| return -1; |
| smk->videoindex = st->index; |
| st->codec->width = smk->width; |
| st->codec->height = smk->height; |
| st->codec->pix_fmt = PIX_FMT_PAL8; |
| st->codec->codec_type = CODEC_TYPE_VIDEO; |
| st->codec->codec_id = CODEC_ID_SMACKVIDEO; |
| st->codec->codec_tag = smk->magic; |
| /* Smacker uses 100000 as internal timebase */ |
| if(smk->pts_inc < 0) |
| smk->pts_inc = -smk->pts_inc; |
| else |
| smk->pts_inc *= 100; |
| tbase = 100000; |
| av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1); |
| av_set_pts_info(st, 33, smk->pts_inc, tbase); |
| /* handle possible audio streams */ |
| for(i = 0; i < 7; i++) { |
| smk->indexes[i] = -1; |
| if((smk->rates[i] & 0xFFFFFF) && !(smk->rates[i] & SMK_AUD_BINKAUD)){ |
| ast[i] = av_new_stream(s, 0); |
| smk->indexes[i] = ast[i]->index; |
| ast[i]->codec->codec_type = CODEC_TYPE_AUDIO; |
| ast[i]->codec->codec_id = (smk->rates[i] & SMK_AUD_PACKED) ? CODEC_ID_SMACKAUDIO : CODEC_ID_PCM_U8; |
| ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A'); |
| ast[i]->codec->channels = (smk->rates[i] & SMK_AUD_STEREO) ? 2 : 1; |
| ast[i]->codec->sample_rate = smk->rates[i] & 0xFFFFFF; |
| ast[i]->codec->bits_per_coded_sample = (smk->rates[i] & SMK_AUD_16BITS) ? 16 : 8; |
| if(ast[i]->codec->bits_per_coded_sample == 16 && ast[i]->codec->codec_id == CODEC_ID_PCM_U8) |
| ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE; |
| ast[i]->codec->sample_fmt = ast[i]->codec->bits_per_coded_sample == 8 ? SAMPLE_FMT_U8 : SAMPLE_FMT_S16; |
| av_set_pts_info(ast[i], 64, 1, ast[i]->codec->sample_rate |
| * ast[i]->codec->channels * ast[i]->codec->bits_per_coded_sample / 8); |
| } |
| } |
| |
| |
| /* load trees to extradata, they will be unpacked by decoder */ |
| st->codec->extradata = av_malloc(smk->treesize + 16); |
| st->codec->extradata_size = smk->treesize + 16; |
| if(!st->codec->extradata){ |
| av_log(s, AV_LOG_ERROR, "Cannot allocate %i bytes of extradata\n", smk->treesize + 16); |
| av_free(smk->frm_size); |
| av_free(smk->frm_flags); |
| return -1; |
| } |
| ret = get_buffer(pb, st->codec->extradata + 16, st->codec->extradata_size - 16); |
| if(ret != st->codec->extradata_size - 16){ |
| av_free(smk->frm_size); |
| av_free(smk->frm_flags); |
| return AVERROR(EIO); |
| } |
| ((int32_t*)st->codec->extradata)[0] = le2me_32(smk->mmap_size); |
| ((int32_t*)st->codec->extradata)[1] = le2me_32(smk->mclr_size); |
| ((int32_t*)st->codec->extradata)[2] = le2me_32(smk->full_size); |
| ((int32_t*)st->codec->extradata)[3] = le2me_32(smk->type_size); |
| |
| smk->curstream = -1; |
| smk->nextpos = url_ftell(pb); |
| |
| return 0; |
| } |
| |
| |
| static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| SmackerContext *smk = s->priv_data; |
| int flags; |
| int ret; |
| int i; |
| int frame_size = 0; |
| int palchange = 0; |
| int pos; |
| |
| if (url_feof(s->pb) || smk->cur_frame >= smk->frames) |
| return AVERROR(EIO); |
| |
| /* if we demuxed all streams, pass another frame */ |
| if(smk->curstream < 0) { |
| url_fseek(s->pb, smk->nextpos, 0); |
| frame_size = smk->frm_size[smk->cur_frame] & (~3); |
| flags = smk->frm_flags[smk->cur_frame]; |
| /* handle palette change event */ |
| pos = url_ftell(s->pb); |
| 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 = get_byte(s->pb); |
| size = size * 4 - 1; |
| frame_size -= size; |
| frame_size--; |
| sz = 0; |
| pos = url_ftell(s->pb) + size; |
| while(sz < 256){ |
| t = get_byte(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 = get_byte(s->pb) * 3; |
| j = (t & 0x3F) + 1; |
| 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[get_byte(s->pb) & 0x3F]; |
| *pal++ = smk_pal[get_byte(s->pb) & 0x3F]; |
| sz++; |
| } |
| } |
| url_fseek(s->pb, pos, 0); |
| palchange |= 1; |
| } |
| flags >>= 1; |
| smk->curstream = -1; |
| /* if audio chunks are present, put them to stack and retrieve later */ |
| for(i = 0; i < 7; i++) { |
| if(flags & 1) { |
| int size; |
| size = get_le32(s->pb) - 4; |
| frame_size -= size; |
| frame_size -= 4; |
| smk->curstream++; |
| smk->bufs[smk->curstream] = av_realloc(smk->bufs[smk->curstream], size); |
| smk->buf_sizes[smk->curstream] = size; |
| ret = get_buffer(s->pb, smk->bufs[smk->curstream], size); |
| if(ret != size) |
| return AVERROR(EIO); |
| smk->stream_id[smk->curstream] = smk->indexes[i]; |
| } |
| flags >>= 1; |
| } |
| if (av_new_packet(pkt, frame_size + 768)) |
| return AVERROR(ENOMEM); |
| if(smk->frm_size[smk->cur_frame] & 1) |
| palchange |= 2; |
| pkt->data[0] = palchange; |
| memcpy(pkt->data + 1, smk->pal, 768); |
| ret = get_buffer(s->pb, pkt->data + 769, frame_size); |
| if(ret != frame_size) |
| return AVERROR(EIO); |
| pkt->stream_index = smk->videoindex; |
| pkt->size = ret + 769; |
| smk->cur_frame++; |
| smk->nextpos = url_ftell(s->pb); |
| } else { |
| if (av_new_packet(pkt, smk->buf_sizes[smk->curstream])) |
| return AVERROR(ENOMEM); |
| memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]); |
| pkt->size = smk->buf_sizes[smk->curstream]; |
| pkt->stream_index = smk->stream_id[smk->curstream]; |
| pkt->pts = smk->aud_pts[smk->curstream]; |
| smk->aud_pts[smk->curstream] += AV_RL32(pkt->data); |
| smk->curstream--; |
| } |
| |
| return 0; |
| } |
| |
| static int smacker_read_close(AVFormatContext *s) |
| { |
| SmackerContext *smk = s->priv_data; |
| int i; |
| |
| for(i = 0; i < 7; i++) |
| if(smk->bufs[i]) |
| av_free(smk->bufs[i]); |
| if(smk->frm_size) |
| av_free(smk->frm_size); |
| if(smk->frm_flags) |
| av_free(smk->frm_flags); |
| |
| return 0; |
| } |
| |
| AVInputFormat smacker_demuxer = { |
| "smk", |
| NULL_IF_CONFIG_SMALL("Smacker video"), |
| sizeof(SmackerContext), |
| smacker_probe, |
| smacker_read_header, |
| smacker_read_packet, |
| smacker_read_close, |
| }; |
