support for Tiertex .seq files demuxing/video decoding, by Gregory Montoir %cyx A users P sourceforge P net%

Originally committed as revision 6672 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog

@@ -61,6 +61,7 @@ version <next>
 - WavPack lossless audio decoder
 - Targa (.TGA) picture decoder
 - Delphine Software .cin demuxer/audio and video decoder
+- Tiertex .seq demuxer/video decoder
 
 version 0.4.9-pre1:
 

doc/ffmpeg-doc.texi

@@ -740,6 +740,8 @@ library:
 @tab Multimedia format used by Delphine Software games.
 @item MXF @tab    @tab X
 @tab Material eXchange Format SMPTE 377M, used by D-Cinema, broadcast industry.
+@item SEQ @tab    @tab X
+@tab Tiertex .seq files used in the DOS CDROM version of the game Flashback.
 @end multitable
 
 @code{X} means that encoding (resp. decoding) is supported.
@@ -843,6 +845,7 @@ following image formats are supported:
 @item KMVC                   @tab     @tab  X @tab Codec used in Worms games.
 @item VMware Video           @tab     @tab  X @tab Codec used in videos captured by VMware.
 @item Cin Video              @tab     @tab  X @tab Codec used in Delphine Software games.
+@item Tiertex Seq Video      @tab     @tab  X @tab Codec used in DOS CDROM FlashBack game.
 @end multitable
 
 @code{X} means that encoding (resp. decoding) is supported.

libavcodec/Makefile

@@ -146,6 +146,7 @@ OBJS-$(CONFIG_VCR1_ENCODER)            += vcr1.o
 OBJS-$(CONFIG_VMDAUDIO_DECODER)        += vmdav.o
 OBJS-$(CONFIG_VMDVIDEO_DECODER)        += vmdav.o
 OBJS-$(CONFIG_VMNC_DECODER)            += vmnc.o
+OBJS-$(CONFIG_TIERTEXSEQVIDEO_DECODER) += tiertexseqv.o
 OBJS-$(CONFIG_VORBIS_DECODER)          += vorbis.o vorbis_data.o
 OBJS-$(CONFIG_VORBIS_ENCODER)          += vorbis_enc.o vorbis_data.o
 OBJS-$(CONFIG_VP3_DECODER)             += vp3.o

libavcodec/allcodecs.c

@@ -554,6 +554,9 @@ void avcodec_register_all(void)
 #ifdef CONFIG_DSICINAUDIO_DECODER
     register_avcodec(&dsicinaudio_decoder);
 #endif //CONFIG_DSICINAUDIO_DECODER
+#ifdef CONFIG_TIERTEXSEQVIDEO_DECODER
+    register_avcodec(&tiertexseqvideo_decoder);
+#endif //CONFIG_TIERTEXSEQVIDEO_DECODER
 
 #if defined(CONFIG_AMR_NB) || defined(CONFIG_AMR_NB_FIXED)
 #ifdef CONFIG_AMR_NB_DECODER

libavcodec/avcodec.h

@@ -37,8 +37,8 @@ extern "C" {
 #define AV_STRINGIFY(s)         AV_TOSTRING(s)
 #define AV_TOSTRING(s) #s
 
-#define LIBAVCODEC_VERSION_INT  ((51<<16)+(18<<8)+0)
+#define LIBAVCODEC_VERSION_INT  ((51<<16)+(19<<8)+0)
-#define LIBAVCODEC_VERSION      51.18.0
+#define LIBAVCODEC_VERSION      51.19.0
 #define LIBAVCODEC_BUILD        LIBAVCODEC_VERSION_INT
 
 #define LIBAVCODEC_IDENT        "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@@ -146,6 +146,7 @@ enum CodecID {
     CODEC_ID_VP6F,
     CODEC_ID_TARGA,
     CODEC_ID_DSICINVIDEO,
+    CODEC_ID_TIERTEXSEQVIDEO,
 
     /* various pcm "codecs" */
     CODEC_ID_PCM_S16LE= 0x10000,
@@ -2298,6 +2299,7 @@ extern AVCodec wavpack_decoder;
 extern AVCodec targa_decoder;
 extern AVCodec dsicinvideo_decoder;
 extern AVCodec dsicinaudio_decoder;
+extern AVCodec tiertexseqvideo_decoder;
 
 /* pcm codecs */
 #define PCM_CODEC(id, name) \

libavcodec/tiertexseqv.c

@@ -0,0 +1,232 @@
+/*
+ * Tiertex Limited SEQ Video Decoder
+ * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
+ *
+ * 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
+ */
+
+/**
+ * @file tiertexseqv.c
+ * Tiertex Limited SEQ video decoder
+ */
+
+#include "avcodec.h"
+#include "common.h"
+#define ALT_BITSTREAM_READER_LE
+#include "bitstream.h"
+
+
+typedef struct SeqVideoContext {
+    AVCodecContext *avctx;
+    AVFrame frame;
+    unsigned int palette[256];
+    unsigned char block[8 * 8];
+} SeqVideoContext;
+
+
+static unsigned char *seq_unpack_rle_block(unsigned char *src, unsigned char *dst, int dst_size)
+{
+    int i, len, sz;
+    GetBitContext gb;
+    int code_table[64];
+
+    /* get the rle codes (at most 64 bytes) */
+    init_get_bits(&gb, src, 64 * 8);
+    for (i = 0, sz = 0; i < 64 && sz < dst_size; i++) {
+        code_table[i] = get_sbits(&gb, 4);
+        sz += FFABS(code_table[i]);
+    }
+    src += (get_bits_count(&gb) + 7) / 8;
+
+    /* do the rle unpacking */
+    for (i = 0; i < 64 && dst_size > 0; i++) {
+        len = code_table[i];
+        if (len < 0) {
+            len = -len;
+            memset(dst, *src++, FFMIN(len, dst_size));
+        } else {
+            memcpy(dst, src, FFMIN(len, dst_size));
+            src += len;
+        }
+        dst += len;
+        dst_size -= len;
+    }
+    return src;
+}
+
+static unsigned char *seq_decode_op1(SeqVideoContext *seq, unsigned char *src, unsigned char *dst)
+{
+    unsigned char *color_table;
+    int b, i, len, bits;
+    GetBitContext gb;
+
+    len = *src++;
+    if (len & 0x80) {
+        switch (len & 3) {
+        case 1:
+            src = seq_unpack_rle_block(src, seq->block, sizeof(seq->block));
+            for (b = 0; b < 8; b++) {
+                memcpy(dst, &seq->block[b * 8], 8);
+                dst += seq->frame.linesize[0];
+            }
+            break;
+        case 2:
+            src = seq_unpack_rle_block(src, seq->block, sizeof(seq->block));
+            for (i = 0; i < 8; i++) {
+                for (b = 0; b < 8; b++)
+                    dst[b * seq->frame.linesize[0]] = seq->block[i * 8 + b];
+                ++dst;
+            }
+            break;
+        }
+    } else {
+        color_table = src;
+        src += len;
+        bits = ff_log2_tab[len - 1] + 1;
+        init_get_bits(&gb, src, bits * 8 * 8); src += bits * 8;
+        for (b = 0; b < 8; b++) {
+            for (i = 0; i < 8; i++)
+                dst[i] = color_table[get_bits(&gb, bits)];
+            dst += seq->frame.linesize[0];
+        }
+    }
+
+    return src;
+}
+
+static unsigned char *seq_decode_op2(SeqVideoContext *seq, unsigned char *src, unsigned char *dst)
+{
+    int i;
+
+    for (i = 0; i < 8; i++) {
+        memcpy(dst, src, 8);
+        src += 8;
+        dst += seq->frame.linesize[0];
+    }
+
+    return src;
+}
+
+static unsigned char *seq_decode_op3(SeqVideoContext *seq, unsigned char *src, unsigned char *dst)
+{
+    int pos, offset;
+
+    do {
+        pos = *src++;
+        offset = ((pos >> 3) & 7) * seq->frame.linesize[0] + (pos & 7);
+        dst[offset] = *src++;
+    } while (!(pos & 0x80));
+
+    return src;
+}
+
+static void seqvideo_decode(SeqVideoContext *seq, unsigned char *data, int data_size)
+{
+    GetBitContext gb;
+    int flags, i, j, x, y, op;
+    unsigned char c[3];
+    unsigned char *dst;
+
+    flags = *data++;
+
+    if (flags & 1) {
+        for (i = 0; i < 256; i++) {
+            for (j = 0; j < 3; j++, data++)
+                c[j] = (*data << 2) | (*data >> 4);
+            seq->palette[i] = (c[0] << 16) | (c[1] << 8) | c[2];
+        }
+        memcpy(seq->frame.data[1], seq->palette, sizeof(seq->palette));
+        seq->frame.palette_has_changed = 1;
+    }
+
+    if (flags & 2) {
+        init_get_bits(&gb, data, 128 * 8); data += 128;
+        for (y = 0; y < 128; y += 8)
+            for (x = 0; x < 256; x += 8) {
+                dst = &seq->frame.data[0][y * seq->frame.linesize[0] + x];
+                op = get_bits(&gb, 2);
+                switch (op) {
+                case 1:
+                    data = seq_decode_op1(seq, data, dst);
+                    break;
+                case 2:
+                    data = seq_decode_op2(seq, data, dst);
+                    break;
+                case 3:
+                    data = seq_decode_op3(seq, data, dst);
+                    break;
+                }
+            }
+    }
+}
+
+static int seqvideo_decode_init(AVCodecContext *avctx)
+{
+    SeqVideoContext *seq = (SeqVideoContext *)avctx->priv_data;
+
+    seq->avctx = avctx;
+    avctx->pix_fmt = PIX_FMT_PAL8;
+    avctx->has_b_frames = 0;
+
+    seq->frame.data[0] = NULL;
+
+    return 0;
+}
+
+static int seqvideo_decode_frame(AVCodecContext *avctx,
+                                 void *data, int *data_size,
+                                 uint8_t *buf, int buf_size)
+{
+
+    SeqVideoContext *seq = (SeqVideoContext *)avctx->priv_data;
+
+    seq->frame.reference = 1;
+    seq->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
+    if (avctx->reget_buffer(avctx, &seq->frame)) {
+        av_log(seq->avctx, AV_LOG_ERROR, "tiertexseqvideo: reget_buffer() failed\n");
+        return -1;
+    }
+
+    seqvideo_decode(seq, buf, buf_size);
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame *)data = seq->frame;
+
+    return buf_size;
+}
+
+static int seqvideo_decode_end(AVCodecContext *avctx)
+{
+    SeqVideoContext *seq = (SeqVideoContext *)avctx->priv_data;
+
+    if (seq->frame.data[0])
+        avctx->release_buffer(avctx, &seq->frame);
+
+    return 0;
+}
+
+AVCodec tiertexseqvideo_decoder = {
+    "tiertexseqvideo",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_TIERTEXSEQVIDEO,
+    sizeof(SeqVideoContext),
+    seqvideo_decode_init,
+    NULL,
+    seqvideo_decode_end,
+    seqvideo_decode_frame,
+    CODEC_CAP_DR1,
+};

libavformat/Makefile

@@ -130,6 +130,7 @@ OBJS-$(CONFIG_WSVQA_DEMUXER)             += westwood.o
 OBJS-$(CONFIG_WV_DEMUXER)                += wv.o
 OBJS-$(CONFIG_YUV4MPEGPIPE_MUXER)        += yuv4mpeg.o
 OBJS-$(CONFIG_YUV4MPEGPIPE_DEMUXER)      += yuv4mpeg.o
+OBJS-$(CONFIG_TIERTEXSEQ_DEMUXER)        += tiertexseq.o
 
 # image formats
 OBJS+= pnm.o yuv.o png.o jpeg.o gifdec.o sgi.o

libavformat/allformats.c

@@ -478,6 +478,9 @@ void av_register_all(void)
 #ifdef CONFIG_YUV4MPEGPIPE_DEMUXER
     av_register_input_format(&yuv4mpegpipe_demuxer);
 #endif
+#ifdef CONFIG_TIERTEXSEQ_DEMUXER
+    av_register_input_format(&tiertexseq_demuxer);
+#endif
 
     /* image formats */
 #if 0

libavformat/allformats.h

@@ -162,6 +162,7 @@ extern AVInputFormat wsvqa_demuxer;
 extern AVInputFormat wv_demuxer;
 extern AVOutputFormat yuv4mpegpipe_muxer;
 extern AVInputFormat yuv4mpegpipe_demuxer;
+extern AVInputFormat tiertexseq_demuxer;
 
 /* raw.c */
 int pcm_read_seek(AVFormatContext *s,

libavformat/avformat.h

@@ -25,8 +25,8 @@
 extern "C" {
 #endif
 
-#define LIBAVFORMAT_VERSION_INT ((50<<16)+(5<<8)+0)
+#define LIBAVFORMAT_VERSION_INT ((50<<16)+(6<<8)+0)
-#define LIBAVFORMAT_VERSION     50.5.0
+#define LIBAVFORMAT_VERSION     50.6.0
 #define LIBAVFORMAT_BUILD       LIBAVFORMAT_VERSION_INT
 
 #define LIBAVFORMAT_IDENT       "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)

libavformat/tiertexseq.c

@@ -0,0 +1,305 @@
+/*
+ * Tiertex Limited SEQ File Demuxer
+ * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
+ *
+ * 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
+ */
+
+/**
+ * @file tiertexseq.c
+ * Tiertex Limited SEQ file demuxer
+ */
+
+#include "avformat.h"
+
+#define SEQ_FRAME_SIZE         6144
+#define SEQ_FRAME_W            256
+#define SEQ_FRAME_H            128
+#define SEQ_NUM_FRAME_BUFFERS  30
+#define SEQ_AUDIO_BUFFER_SIZE  882
+#define SEQ_SAMPLE_RATE        22050
+#define SEQ_FRAME_RATE         25
+
+
+typedef struct TiertexSeqFrameBuffer {
+    int fill_size;
+    int data_size;
+    unsigned char *data;
+} TiertexSeqFrameBuffer;
+
+typedef struct SeqDemuxContext {
+    int audio_stream_index;
+    int video_stream_index;
+    int current_frame_pts;
+    int current_frame_offs;
+    TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS];
+    int frame_buffers_count;
+    unsigned int current_audio_data_size;
+    unsigned int current_audio_data_offs;
+    unsigned int current_pal_data_size;
+    unsigned int current_pal_data_offs;
+    unsigned int current_video_data_size;
+    unsigned char *current_video_data_ptr;
+    int audio_buffer_full;
+} SeqDemuxContext;
+
+
+static int seq_probe(AVProbeData *p)
+{
+    int i;
+
+    if (p->buf_size < 256)
+        return 0;
+
+    /* there's no real header in a .seq file, the only thing they have in common */
+    /* is the first 256 bytes of the file which are always filled with 0 */
+    for (i = 0; i < 256; i++)
+        if (p->buf[0] != 0)
+            return 0;
+
+    /* only one fourth of the score since the previous check is too naive */
+    return AVPROBE_SCORE_MAX / 4;
+}
+
+static int seq_init_frame_buffers(SeqDemuxContext *seq, ByteIOContext *pb)
+{
+    int i, sz;
+    TiertexSeqFrameBuffer *seq_buffer;
+
+    url_fseek(pb, 256, SEEK_SET);
+
+    for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) {
+        sz = get_le16(pb);
+        if (sz == 0)
+            break;
+        else {
+            seq_buffer = &seq->frame_buffers[i];
+            seq_buffer->fill_size = 0;
+            seq_buffer->data_size = sz;
+            seq_buffer->data = av_malloc(sz);
+            if (!seq_buffer->data)
+                return AVERROR_NOMEM;
+        }
+    }
+    seq->frame_buffers_count = i;
+    return 0;
+}
+
+static int seq_fill_buffer(SeqDemuxContext *seq, ByteIOContext *pb, int buffer_num, unsigned int data_offs, int data_size)
+{
+    TiertexSeqFrameBuffer *seq_buffer;
+
+    if (buffer_num >= SEQ_NUM_FRAME_BUFFERS)
+        return AVERROR_INVALIDDATA;
+
+    seq_buffer = &seq->frame_buffers[buffer_num];
+    if (seq_buffer->fill_size + data_size > seq_buffer->data_size)
+        return AVERROR_INVALIDDATA;
+
+    url_fseek(pb, seq->current_frame_offs + data_offs, SEEK_SET);
+    if (get_buffer(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size)
+        return AVERROR_IO;
+
+    seq_buffer->fill_size += data_size;
+    return 0;
+}
+
+static int seq_parse_frame_data(SeqDemuxContext *seq, ByteIOContext *pb)
+{
+    unsigned int offset_table[4], buffer_num[4];
+    TiertexSeqFrameBuffer *seq_buffer;
+    int i, e;
+
+    seq->current_frame_offs += SEQ_FRAME_SIZE;
+    url_fseek(pb, seq->current_frame_offs, SEEK_SET);
+
+    /* sound data */
+    seq->current_audio_data_offs = get_le16(pb);
+    if (seq->current_audio_data_offs != 0) {
+        seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2;
+    } else {
+        seq->current_audio_data_size = 0;
+    }
+
+    /* palette data */
+    seq->current_pal_data_offs = get_le16(pb);
+    if (seq->current_pal_data_offs != 0) {
+        seq->current_pal_data_size = 768;
+    } else {
+        seq->current_pal_data_size = 0;
+    }
+
+    /* video data */
+    for (i = 0; i < 4; i++)
+        buffer_num[i] = get_byte(pb);
+
+    for (i = 0; i < 4; i++)
+        offset_table[i] = get_le16(pb);
+
+    for (i = 0; i < 3; i++) {
+        if (offset_table[i] != 0) {
+            for (e = i + 1; e < 4 && offset_table[e] == 0; e++);
+            seq_fill_buffer(seq, pb, buffer_num[1 + i],
+              offset_table[i],
+              offset_table[e] - offset_table[i]);
+        }
+    }
+
+    if (buffer_num[0] != 255) {
+        seq_buffer = &seq->frame_buffers[buffer_num[0]];
+        seq->current_video_data_size = seq_buffer->fill_size;
+        seq->current_video_data_ptr  = seq_buffer->data;
+        seq_buffer->fill_size = 0;
+    } else {
+        seq->current_video_data_size = 0;
+        seq->current_video_data_ptr  = 0;
+    }
+
+    return 0;
+}
+
+static int seq_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    int i, rc;
+    SeqDemuxContext *seq = (SeqDemuxContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    AVStream *st;
+
+    /* init internal buffers */
+    rc = seq_init_frame_buffers(seq, pb);
+    if (rc)
+        return rc;
+
+    seq->current_frame_offs = 0;
+
+    /* preload (no audio data, just buffer operations related data) */
+    for (i = 1; i <= 100; i++) {
+        rc = seq_parse_frame_data(seq, pb);
+        if (rc)
+            return rc;
+    }
+
+    seq->current_frame_pts = 0;
+
+    seq->audio_buffer_full = 0;
+
+    /* initialize the video decoder stream */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+
+    av_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
+    seq->video_stream_index = st->index;
+    st->codec->codec_type = CODEC_TYPE_VIDEO;
+    st->codec->codec_id = CODEC_ID_TIERTEXSEQVIDEO;
+    st->codec->codec_tag = 0;  /* no fourcc */
+    st->codec->width = SEQ_FRAME_W;
+    st->codec->height = SEQ_FRAME_H;
+
+    /* initialize the audio decoder stream */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+
+    av_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
+    seq->audio_stream_index = st->index;
+    st->codec->codec_type = CODEC_TYPE_AUDIO;
+    st->codec->codec_id = CODEC_ID_PCM_S16BE;
+    st->codec->codec_tag = 0;  /* no tag */
+    st->codec->channels = 1;
+    st->codec->sample_rate = SEQ_SAMPLE_RATE;
+    st->codec->bits_per_sample = 16;
+    st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_sample * st->codec->channels;
+    st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
+
+    return 0;
+}
+
+static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int rc;
+    SeqDemuxContext *seq = (SeqDemuxContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+
+    if (!seq->audio_buffer_full) {
+        rc = seq_parse_frame_data(seq, pb);
+        if (rc)
+            return rc;
+
+        /* video packet */
+        if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
+            if (av_new_packet(pkt, 1 + seq->current_pal_data_size + seq->current_video_data_size))
+                return AVERROR_NOMEM;
+
+            pkt->data[0] = 0;
+            if (seq->current_pal_data_size != 0) {
+                pkt->data[0] |= 1;
+                url_fseek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
+                if (get_buffer(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
+                    return AVERROR_IO;
+            }
+            if (seq->current_video_data_size != 0) {
+                pkt->data[0] |= 2;
+                memcpy(&pkt->data[1 + seq->current_pal_data_size],
+                  seq->current_video_data_ptr,
+                  seq->current_video_data_size);
+            }
+            pkt->stream_index = seq->video_stream_index;
+            pkt->pts = seq->current_frame_pts;
+
+            /* sound buffer will be processed on next read_packet() call */
+            seq->audio_buffer_full = 1;
+            return 0;
+       }
+    }
+
+    /* audio packet */
+    if (seq->current_audio_data_offs == 0) /* end of data reached */
+        return AVERROR_IO;
+
+    url_fseek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
+    rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
+    if (rc < 0)
+        return rc;
+
+    pkt->stream_index = seq->audio_stream_index;
+    pkt->pts = seq->current_frame_pts++;
+
+    seq->audio_buffer_full = 0;
+    return 0;
+}
+
+static int seq_read_close(AVFormatContext *s)
+{
+    int i;
+    SeqDemuxContext *seq = (SeqDemuxContext *)s->priv_data;
+
+    for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++)
+        av_free(seq->frame_buffers[i].data);
+
+    return 0;
+}
+
+AVInputFormat tiertexseq_demuxer = {
+    "tiertexseq",
+    "Tiertex Limited SEQ format",
+    sizeof(SeqDemuxContext),
+    seq_probe,
+    seq_read_header,
+    seq_read_packet,
+    seq_read_close,
+};