359 lines
11 KiB
C
Executable file
359 lines
11 KiB
C
Executable file
/*
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* Smacker demuxer
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* Copyright (c) 2006 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Based on http://wiki.multimedia.cx/index.php?title=Smacker
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*/
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#include <inttypes.h>
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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "internal.h"
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#define SMACKER_PAL 0x01
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#define SMACKER_FLAG_RING_FRAME 0x01
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enum SAudFlags {
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SMK_AUD_PACKED = 0x80,
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SMK_AUD_16BITS = 0x20,
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SMK_AUD_STEREO = 0x10,
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SMK_AUD_BINKAUD = 0x08,
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SMK_AUD_USEDCT = 0x04
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};
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typedef struct SmackerContext {
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uint32_t frames;
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/* frame info */
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uint32_t *frm_size;
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uint8_t *frm_flags;
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/* internal variables */
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int64_t next_frame_pos;
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int cur_frame;
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int videoindex;
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int indexes[7];
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/* current frame for demuxing */
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uint32_t frame_size;
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int flags;
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int next_audio_index;
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int new_palette;
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uint8_t pal[768];
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int64_t aud_pts[7];
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} SmackerContext;
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/* palette used in Smacker */
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static const uint8_t smk_pal[64] = {
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0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
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0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
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0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
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0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
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0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
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0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
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0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
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0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
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};
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static int smacker_probe(const AVProbeData *p)
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{
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if ( AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '2')
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&& AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '4'))
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return 0;
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if (AV_RL32(p->buf+4) > 32768U || AV_RL32(p->buf+8) > 32768U)
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return AVPROBE_SCORE_MAX/4;
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return AVPROBE_SCORE_MAX;
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}
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static int smacker_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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SmackerContext *smk = s->priv_data;
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AVStream *st;
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AVCodecParameters *par;
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uint32_t magic, width, height, flags, treesize;
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int i, ret, pts_inc;
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int tbase;
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/* read and check header */
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magic = avio_rl32(pb);
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if (magic != MKTAG('S', 'M', 'K', '2') && magic != MKTAG('S', 'M', 'K', '4'))
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return AVERROR_INVALIDDATA;
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width = avio_rl32(pb);
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height = avio_rl32(pb);
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smk->frames = avio_rl32(pb);
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pts_inc = avio_rl32(pb);
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if (pts_inc > INT_MAX / 100) {
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av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", pts_inc);
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return AVERROR_INVALIDDATA;
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}
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flags = avio_rl32(pb);
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if (flags & SMACKER_FLAG_RING_FRAME)
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smk->frames++;
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if (smk->frames > 0xFFFFFF) {
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av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames);
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return AVERROR_INVALIDDATA;
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}
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avio_skip(pb, 28); /* Unused audio related data */
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treesize = avio_rl32(pb);
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if (treesize >= UINT_MAX/4) {
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// treesize + 16 must not overflow (this check is probably redundant)
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av_log(s, AV_LOG_ERROR, "treesize too large\n");
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return AVERROR_INVALIDDATA;
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}
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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smk->videoindex = st->index;
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/* Smacker uses 100000 as internal timebase */
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if (pts_inc < 0)
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pts_inc = -pts_inc;
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else
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pts_inc *= 100;
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tbase = 100000;
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av_reduce(&tbase, &pts_inc, tbase, pts_inc, (1UL << 31) - 1);
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avpriv_set_pts_info(st, 33, pts_inc, tbase);
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st->duration = smk->frames;
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/* init video codec */
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par = st->codecpar;
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par->width = width;
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par->height = height;
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par->format = AV_PIX_FMT_PAL8;
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par->codec_type = AVMEDIA_TYPE_VIDEO;
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par->codec_id = AV_CODEC_ID_SMACKVIDEO;
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par->codec_tag = magic;
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if ((ret = ff_alloc_extradata(par, treesize + 16)) < 0) {
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av_log(s, AV_LOG_ERROR,
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"Cannot allocate %"PRIu32" bytes of extradata\n",
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treesize + 16);
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return ret;
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}
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if ((ret = ffio_read_size(pb, par->extradata, 16)) < 0)
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return ret;
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/* handle possible audio streams */
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for (i = 0; i < 7; i++) {
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uint32_t rate = avio_rl24(pb);
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uint8_t aflag = avio_r8(pb);
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smk->indexes[i] = -1;
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if (rate) {
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AVStream *ast = avformat_new_stream(s, NULL);
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AVCodecParameters *par;
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if (!ast)
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return AVERROR(ENOMEM);
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smk->indexes[i] = ast->index;
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par = ast->codecpar;
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par->codec_type = AVMEDIA_TYPE_AUDIO;
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if (aflag & SMK_AUD_BINKAUD) {
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par->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
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} else if (aflag & SMK_AUD_USEDCT) {
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par->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
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} else if (aflag & SMK_AUD_PACKED) {
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par->codec_id = AV_CODEC_ID_SMACKAUDIO;
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par->codec_tag = MKTAG('S', 'M', 'K', 'A');
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} else {
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par->codec_id = AV_CODEC_ID_PCM_U8;
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}
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if (aflag & SMK_AUD_STEREO) {
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par->channels = 2;
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par->channel_layout = AV_CH_LAYOUT_STEREO;
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} else {
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par->channels = 1;
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par->channel_layout = AV_CH_LAYOUT_MONO;
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}
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par->sample_rate = rate;
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par->bits_per_coded_sample = (aflag & SMK_AUD_16BITS) ? 16 : 8;
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if (par->bits_per_coded_sample == 16 &&
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par->codec_id == AV_CODEC_ID_PCM_U8)
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par->codec_id = AV_CODEC_ID_PCM_S16LE;
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avpriv_set_pts_info(ast, 64, 1, par->sample_rate * par->channels
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* par->bits_per_coded_sample / 8);
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}
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}
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avio_rl32(pb); /* padding */
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/* setup data */
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st->priv_data = av_malloc_array(smk->frames, sizeof(*smk->frm_size) +
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sizeof(*smk->frm_flags));
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if (!st->priv_data)
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return AVERROR(ENOMEM);
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smk->frm_size = st->priv_data;
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smk->frm_flags = (void*)(smk->frm_size + smk->frames);
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/* read frame info */
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for (i = 0; i < smk->frames; i++) {
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smk->frm_size[i] = avio_rl32(pb);
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}
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if ((ret = ffio_read_size(pb, smk->frm_flags, smk->frames)) < 0 ||
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/* load trees to extradata, they will be unpacked by decoder */
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(ret = ffio_read_size(pb, par->extradata + 16,
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par->extradata_size - 16)) < 0) {
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return ret;
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}
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return 0;
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}
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static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SmackerContext *smk = s->priv_data;
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int flags;
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int ret;
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if (avio_feof(s->pb) || smk->cur_frame >= smk->frames)
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return AVERROR_EOF;
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/* if we demuxed all streams, pass another frame */
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if (!smk->next_audio_index) {
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smk->frame_size = smk->frm_size[smk->cur_frame] & (~3);
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smk->next_frame_pos = avio_tell(s->pb) + smk->frame_size;
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flags = smk->frm_flags[smk->cur_frame];
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smk->flags = flags >> 1;
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/* handle palette change event */
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if (flags & SMACKER_PAL) {
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int size, sz, t, off, j, pos;
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uint8_t *pal = smk->pal;
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uint8_t oldpal[768];
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memcpy(oldpal, pal, 768);
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size = avio_r8(s->pb);
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size = size * 4;
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if (size > smk->frame_size) {
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ret = AVERROR_INVALIDDATA;
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goto next_frame;
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}
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smk->frame_size -= size--;
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sz = 0;
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pos = avio_tell(s->pb) + size;
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while (sz < 256) {
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t = avio_r8(s->pb);
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if (t & 0x80) { /* skip palette entries */
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sz += (t & 0x7F) + 1;
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pal += ((t & 0x7F) + 1) * 3;
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} else if (t & 0x40) { /* copy with offset */
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off = avio_r8(s->pb);
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j = (t & 0x3F) + 1;
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if (off + j > 0x100) {
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av_log(s, AV_LOG_ERROR,
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"Invalid palette update, offset=%d length=%d extends beyond palette size\n",
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off, j);
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ret = AVERROR_INVALIDDATA;
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goto next_frame;
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}
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off *= 3;
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while (j-- && sz < 256) {
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*pal++ = oldpal[off + 0];
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*pal++ = oldpal[off + 1];
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*pal++ = oldpal[off + 2];
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sz++;
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off += 3;
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}
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} else { /* new entries */
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*pal++ = smk_pal[t];
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*pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
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*pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
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sz++;
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}
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}
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avio_seek(s->pb, pos, 0);
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smk->new_palette = 1;
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}
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}
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for (int i = smk->next_audio_index; i < 7; i++) {
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if (smk->flags & (1 << i)) {
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uint32_t size;
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size = avio_rl32(s->pb);
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if ((int)size < 8 || size > smk->frame_size) {
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av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
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ret = AVERROR_INVALIDDATA;
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goto next_frame;
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}
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smk->frame_size -= size;
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size -= 4;
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if (smk->indexes[i] < 0) {
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avio_skip(s->pb, size);
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continue;
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}
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if ((ret = av_get_packet(s->pb, pkt, size)) != size) {
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ret = ret < 0 ? ret : AVERROR_INVALIDDATA;
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goto next_frame;
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}
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pkt->stream_index = smk->indexes[i];
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pkt->pts = smk->aud_pts[i];
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smk->aud_pts[i] += AV_RL32(pkt->data);
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smk->next_audio_index = i + 1;
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return 0;
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}
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}
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if (smk->frame_size >= INT_MAX/2) {
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ret = AVERROR_INVALIDDATA;
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goto next_frame;
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}
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if ((ret = av_new_packet(pkt, smk->frame_size + 769)) < 0)
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goto next_frame;
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flags = smk->new_palette;
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if (smk->frm_size[smk->cur_frame] & 1)
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flags |= 2;
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pkt->data[0] = flags;
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memcpy(pkt->data + 1, smk->pal, 768);
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ret = ffio_read_size(s->pb, pkt->data + 769, smk->frame_size);
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if (ret < 0)
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goto next_frame;
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pkt->stream_index = smk->videoindex;
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pkt->pts = smk->cur_frame;
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smk->next_audio_index = 0;
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smk->new_palette = 0;
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smk->cur_frame++;
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return 0;
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next_frame:
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avio_seek(s->pb, smk->next_frame_pos, SEEK_SET);
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smk->next_audio_index = 0;
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smk->cur_frame++;
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return ret;
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}
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AVInputFormat ff_smacker_demuxer = {
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.name = "smk",
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.long_name = NULL_IF_CONFIG_SMALL("Smacker"),
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.priv_data_size = sizeof(SmackerContext),
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.read_probe = smacker_probe,
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.read_header = smacker_read_header,
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.read_packet = smacker_read_packet,
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};
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