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ffmpeg/libavformat/smacker.c

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/*
* 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 = AVMEDIA_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);
st->duration = smk->frames;
/* handle possible audio streams */
for(i = 0; i < 7; i++) {
smk->indexes[i] = -1;
if(smk->rates[i] & 0xFFFFFF){
ast[i] = av_new_stream(s, 0);
smk->indexes[i] = ast[i]->index;
ast[i]->codec->codec_type = AVMEDIA_TYPE_AUDIO;
if (smk->rates[i] & SMK_AUD_BINKAUD) {
ast[i]->codec->codec_id = CODEC_ID_BINKAUDIO_RDFT;
} else if (smk->rates[i] & SMK_AUD_USEDCT) {
ast[i]->codec->codec_id = CODEC_ID_BINKAUDIO_DCT;
} else if (smk->rates[i] & SMK_AUD_PACKED){
ast[i]->codec->codec_id = CODEC_ID_SMACKAUDIO;
ast[i]->codec->codec_tag = MKTAG('S', 'M', 'K', 'A');
} else {
ast[i]->codec->codec_id = CODEC_ID_PCM_U8;
}
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;
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,
};
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