split ffm de/muxer

Originally committed as revision 13413 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 0 insertions, 779 deletions

diff --git a/libavformat/ffm.c b/libavformat/ffm.c
deleted file mode 100644
index 45ac817c6b..0000000000
--- a/libavformat/ffm.c
+++ /dev/null
@@ -1,779 +0,0 @@
-/*
- * FFM (ffserver live feed) muxer and demuxer
- * Copyright (c) 2001 Fabrice Bellard.
- *
- * 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
- */
-#include "avformat.h"
-#include <unistd.h>
-
-/* The FFM file is made of blocks of fixed size */
-#define FFM_HEADER_SIZE 14
-#define PACKET_ID       0x666d
-
-/* each packet contains frames (which can span several packets */
-#define FRAME_HEADER_SIZE    8
-#define FLAG_KEY_FRAME       0x01
-
-typedef struct FFMStream {
-    int64_t pts;
-} FFMStream;
-
-enum {
-    READ_HEADER,
-    READ_DATA,
-};
-
-typedef struct FFMContext {
-    /* only reading mode */
-    offset_t write_index, file_size;
-    int read_state;
-    uint8_t header[FRAME_HEADER_SIZE];
-
-    /* read and write */
-    int first_packet; /* true if first packet, needed to set the discontinuity tag */
-    int first_frame_in_packet; /* true if first frame in packet, needed to know if PTS information is valid */
-    int packet_size;
-    int frame_offset;
-    int64_t pts;
-    uint8_t *packet_ptr, *packet_end;
-    uint8_t packet[FFM_PACKET_SIZE];
-} FFMContext;
-
-static int64_t get_pts(AVFormatContext *s, offset_t pos);
-
-/* disable pts hack for testing */
-int ffm_nopts = 0;
-
-#ifdef CONFIG_MUXERS
-static void flush_packet(AVFormatContext *s)
-{
-    FFMContext *ffm = s->priv_data;
-    int fill_size, h;
-    ByteIOContext *pb = s->pb;
-
-    fill_size = ffm->packet_end - ffm->packet_ptr;
-    memset(ffm->packet_ptr, 0, fill_size);
-
-    if (url_ftell(pb) % ffm->packet_size)
-        av_abort();
-
-    /* put header */
-    put_be16(pb, PACKET_ID);
-    put_be16(pb, fill_size);
-    put_be64(pb, ffm->pts);
-    h = ffm->frame_offset;
-    if (ffm->first_packet)
-        h |= 0x8000;
-    put_be16(pb, h);
-    put_buffer(pb, ffm->packet, ffm->packet_end - ffm->packet);
-    put_flush_packet(pb);
-
-    /* prepare next packet */
-    ffm->frame_offset = 0; /* no key frame */
-    ffm->pts = 0; /* no pts */
-    ffm->packet_ptr = ffm->packet;
-    ffm->first_packet = 0;
-}
-
-/* 'first' is true if first data of a frame */
-static void ffm_write_data(AVFormatContext *s,
-                           const uint8_t *buf, int size,
-                           int64_t pts, int first)
-{
-    FFMContext *ffm = s->priv_data;
-    int len;
-
-    if (first && ffm->frame_offset == 0)
-        ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
-    if (first && ffm->pts == 0)
-        ffm->pts = pts;
-
-    /* write as many packets as needed */
-    while (size > 0) {
-        len = ffm->packet_end - ffm->packet_ptr;
-        if (len > size)
-            len = size;
-        memcpy(ffm->packet_ptr, buf, len);
-
-        ffm->packet_ptr += len;
-        buf += len;
-        size -= len;
-        if (ffm->packet_ptr >= ffm->packet_end) {
-            /* special case : no pts in packet : we leave the current one */
-            if (ffm->pts == 0)
-                ffm->pts = pts;
-
-            flush_packet(s);
-        }
-    }
-}
-
-static int ffm_write_header(AVFormatContext *s)
-{
-    FFMContext *ffm = s->priv_data;
-    AVStream *st;
-    FFMStream *fst;
-    ByteIOContext *pb = s->pb;
-    AVCodecContext *codec;
-    int bit_rate, i;
-
-    ffm->packet_size = FFM_PACKET_SIZE;
-
-    /* header */
-    put_le32(pb, MKTAG('F', 'F', 'M', '1'));
-    put_be32(pb, ffm->packet_size);
-    /* XXX: store write position in other file ? */
-    put_be64(pb, ffm->packet_size); /* current write position */
-
-    put_be32(pb, s->nb_streams);
-    bit_rate = 0;
-    for(i=0;i<s->nb_streams;i++) {
-        st = s->streams[i];
-        bit_rate += st->codec->bit_rate;
-    }
-    put_be32(pb, bit_rate);
-
-    /* list of streams */
-    for(i=0;i<s->nb_streams;i++) {
-        st = s->streams[i];
-        fst = av_mallocz(sizeof(FFMStream));
-        if (!fst)
-            goto fail;
-        av_set_pts_info(st, 64, 1, 1000000);
-        st->priv_data = fst;
-
-        codec = st->codec;
-        /* generic info */
-        put_be32(pb, codec->codec_id);
-        put_byte(pb, codec->codec_type);
-        put_be32(pb, codec->bit_rate);
-        put_be32(pb, st->quality);
-        put_be32(pb, codec->flags);
-        put_be32(pb, codec->flags2);
-        put_be32(pb, codec->debug);
-        /* specific info */
-        switch(codec->codec_type) {
-        case CODEC_TYPE_VIDEO:
-            put_be32(pb, codec->time_base.num);
-            put_be32(pb, codec->time_base.den);
-            put_be16(pb, codec->width);
-            put_be16(pb, codec->height);
-            put_be16(pb, codec->gop_size);
-            put_be32(pb, codec->pix_fmt);
-            put_byte(pb, codec->qmin);
-            put_byte(pb, codec->qmax);
-            put_byte(pb, codec->max_qdiff);
-            put_be16(pb, (int) (codec->qcompress * 10000.0));
-            put_be16(pb, (int) (codec->qblur * 10000.0));
-            put_be32(pb, codec->bit_rate_tolerance);
-            put_strz(pb, codec->rc_eq);
-            put_be32(pb, codec->rc_max_rate);
-            put_be32(pb, codec->rc_min_rate);
-            put_be32(pb, codec->rc_buffer_size);
-            put_be64(pb, av_dbl2int(codec->i_quant_factor));
-            put_be64(pb, av_dbl2int(codec->b_quant_factor));
-            put_be64(pb, av_dbl2int(codec->i_quant_offset));
-            put_be64(pb, av_dbl2int(codec->b_quant_offset));
-            put_be32(pb, codec->dct_algo);
-            put_be32(pb, codec->strict_std_compliance);
-            put_be32(pb, codec->max_b_frames);
-            put_be32(pb, codec->luma_elim_threshold);
-            put_be32(pb, codec->chroma_elim_threshold);
-            put_be32(pb, codec->mpeg_quant);
-            put_be32(pb, codec->intra_dc_precision);
-            put_be32(pb, codec->me_method);
-            put_be32(pb, codec->mb_decision);
-            put_be32(pb, codec->nsse_weight);
-            put_be32(pb, codec->frame_skip_cmp);
-            put_be64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
-            put_be32(pb, codec->codec_tag);
-            break;
-        case CODEC_TYPE_AUDIO:
-            put_be32(pb, codec->sample_rate);
-            put_le16(pb, codec->channels);
-            put_le16(pb, codec->frame_size);
-            break;
-        default:
-            return -1;
-        }
-        /* hack to have real time */
-        if (ffm_nopts)
-            fst->pts = 0;
-        else
-            fst->pts = av_gettime();
-    }
-
-    /* flush until end of block reached */
-    while ((url_ftell(pb) % ffm->packet_size) != 0)
-        put_byte(pb, 0);
-
-    put_flush_packet(pb);
-
-    /* init packet mux */
-    ffm->packet_ptr = ffm->packet;
-    ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
-    assert(ffm->packet_end >= ffm->packet);
-    ffm->frame_offset = 0;
-    ffm->pts = 0;
-    ffm->first_packet = 1;
-
-    return 0;
- fail:
-    for(i=0;i<s->nb_streams;i++) {
-        st = s->streams[i];
-        av_freep(&st->priv_data);
-    }
-    return -1;
-}
-
-static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
-{
-    AVStream *st = s->streams[pkt->stream_index];
-    FFMStream *fst = st->priv_data;
-    int64_t pts;
-    uint8_t header[FRAME_HEADER_SIZE];
-
-    pts = fst->pts;
-    /* packet size & key_frame */
-    header[0] = pkt->stream_index;
-    header[1] = 0;
-    if (pkt->flags & PKT_FLAG_KEY)
-        header[1] |= FLAG_KEY_FRAME;
-    AV_WB24(header+2, pkt->size);
-    AV_WB24(header+5, pkt->duration);
-    ffm_write_data(s, header, FRAME_HEADER_SIZE, pts, 1);
-    ffm_write_data(s, pkt->data, pkt->size, pts, 0);
-
-    fst->pts += pkt->duration;
-    return 0;
-}
-
-static int ffm_write_trailer(AVFormatContext *s)
-{
-    ByteIOContext *pb = s->pb;
-    FFMContext *ffm = s->priv_data;
-
-    /* flush packets */
-    if (ffm->packet_ptr > ffm->packet)
-        flush_packet(s);
-
-    put_flush_packet(pb);
-
-    if (!url_is_streamed(pb)) {
-        int64_t size;
-        /* update the write offset */
-        size = url_ftell(pb);
-        url_fseek(pb, 8, SEEK_SET);
-        put_be64(pb, size);
-        put_flush_packet(pb);
-    }
-
-    return 0;
-}
-#endif //CONFIG_MUXERS
-
-/* ffm demux */
-
-static int ffm_is_avail_data(AVFormatContext *s, int size)
-{
-    FFMContext *ffm = s->priv_data;
-    offset_t pos, avail_size;
-    int len;
-
-    len = ffm->packet_end - ffm->packet_ptr;
-    if (size <= len)
-        return 1;
-    pos = url_ftell(s->pb);
-    if (pos == ffm->write_index) {
-        /* exactly at the end of stream */
-        return 0;
-    } else if (pos < ffm->write_index) {
-        avail_size = ffm->write_index - pos;
-    } else {
-        avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE);
-    }
-    avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len;
-    if (size <= avail_size)
-        return 1;
-    else
-        return 0;
-}
-
-/* first is true if we read the frame header */
-static int ffm_read_data(AVFormatContext *s,
-                         uint8_t *buf, int size, int first)
-{
-    FFMContext *ffm = s->priv_data;
-    ByteIOContext *pb = s->pb;
-    int len, fill_size, size1, frame_offset;
-
-    size1 = size;
-    while (size > 0) {
-    redo:
-        len = ffm->packet_end - ffm->packet_ptr;
-        if (len > size)
-            len = size;
-        if (len == 0) {
-            if (url_ftell(pb) == ffm->file_size)
-                url_fseek(pb, ffm->packet_size, SEEK_SET);
-    retry_read:
-            get_be16(pb); /* PACKET_ID */
-            fill_size = get_be16(pb);
-            ffm->pts = get_be64(pb);
-            ffm->first_frame_in_packet = 1;
-            frame_offset = get_be16(pb);
-            get_buffer(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE);
-            ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size);
-            if (ffm->packet_end < ffm->packet)
-                return -1;
-            /* if first packet or resynchronization packet, we must
-               handle it specifically */
-            if (ffm->first_packet || (frame_offset & 0x8000)) {
-                if (!frame_offset) {
-                    /* This packet has no frame headers in it */
-                    if (url_ftell(pb) >= ffm->packet_size * 3) {
-                        url_fseek(pb, -ffm->packet_size * 2, SEEK_CUR);
-                        goto retry_read;
-                    }
-                    /* This is bad, we cannot find a valid frame header */
-                    return 0;
-                }
-                ffm->first_packet = 0;
-                if ((frame_offset & 0x7ffff) < FFM_HEADER_SIZE)
-                    return -1;
-                ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE;
-                if (!first)
-                    break;
-            } else {
-                ffm->packet_ptr = ffm->packet;
-            }
-            goto redo;
-        }
-        memcpy(buf, ffm->packet_ptr, len);
-        buf += len;
-        ffm->packet_ptr += len;
-        size -= len;
-        first = 0;
-    }
-    return size1 - size;
-}
-
-
-static void adjust_write_index(AVFormatContext *s)
-{
-    FFMContext *ffm = s->priv_data;
-    ByteIOContext *pb = s->pb;
-    int64_t pts;
-    //offset_t orig_write_index = ffm->write_index;
-    offset_t pos_min, pos_max;
-    int64_t pts_start;
-    offset_t ptr = url_ftell(pb);
-
-
-    pos_min = 0;
-    pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
-
-    pts_start = get_pts(s, pos_min);
-
-    pts = get_pts(s, pos_max);
-
-    if (pts - 100000 > pts_start)
-        goto end;
-
-    ffm->write_index = FFM_PACKET_SIZE;
-
-    pts_start = get_pts(s, pos_min);
-
-    pts = get_pts(s, pos_max);
-
-    if (pts - 100000 <= pts_start) {
-        while (1) {
-            offset_t newpos;
-            int64_t newpts;
-
-            newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE;
-
-            if (newpos == pos_min)
-                break;
-
-            newpts = get_pts(s, newpos);
-
-            if (newpts - 100000 <= pts) {
-                pos_max = newpos;
-                pts = newpts;
-            } else {
-                pos_min = newpos;
-            }
-        }
-        ffm->write_index += pos_max;
-    }
-
-    //printf("Adjusted write index from %"PRId64" to %"PRId64": pts=%0.6f\n", orig_write_index, ffm->write_index, pts / 1000000.);
-    //printf("pts range %0.6f - %0.6f\n", get_pts(s, 0) / 1000000. , get_pts(s, ffm->file_size - 2 * FFM_PACKET_SIZE) / 1000000. );
-
- end:
-    url_fseek(pb, ptr, SEEK_SET);
-}
-
-
-static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
-{
-    FFMContext *ffm = s->priv_data;
-    AVStream *st;
-    FFMStream *fst;
-    ByteIOContext *pb = s->pb;
-    AVCodecContext *codec;
-    int i, nb_streams;
-    uint32_t tag;
-
-    /* header */
-    tag = get_le32(pb);
-    if (tag != MKTAG('F', 'F', 'M', '1'))
-        goto fail;
-    ffm->packet_size = get_be32(pb);
-    if (ffm->packet_size != FFM_PACKET_SIZE)
-        goto fail;
-    ffm->write_index = get_be64(pb);
-    /* get also filesize */
-    if (!url_is_streamed(pb)) {
-        ffm->file_size = url_fsize(pb);
-        adjust_write_index(s);
-    } else {
-        ffm->file_size = (UINT64_C(1) << 63) - 1;
-    }
-
-    nb_streams = get_be32(pb);
-    get_be32(pb); /* total bitrate */
-    /* read each stream */
-    for(i=0;i<nb_streams;i++) {
-        char rc_eq_buf[128];
-
-        st = av_new_stream(s, 0);
-        if (!st)
-            goto fail;
-        fst = av_mallocz(sizeof(FFMStream));
-        if (!fst)
-            goto fail;
-        s->streams[i] = st;
-
-        av_set_pts_info(st, 64, 1, 1000000);
-
-        st->priv_data = fst;
-
-        codec = st->codec;
-        /* generic info */
-        codec->codec_id = get_be32(pb);
-        codec->codec_type = get_byte(pb); /* codec_type */
-        codec->bit_rate = get_be32(pb);
-        st->quality = get_be32(pb);
-        codec->flags = get_be32(pb);
-        codec->flags2 = get_be32(pb);
-        codec->debug = get_be32(pb);
-        /* specific info */
-        switch(codec->codec_type) {
-        case CODEC_TYPE_VIDEO:
-            codec->time_base.num = get_be32(pb);
-            codec->time_base.den = get_be32(pb);
-            codec->width = get_be16(pb);
-            codec->height = get_be16(pb);
-            codec->gop_size = get_be16(pb);
-            codec->pix_fmt = get_be32(pb);
-            codec->qmin = get_byte(pb);
-            codec->qmax = get_byte(pb);
-            codec->max_qdiff = get_byte(pb);
-            codec->qcompress = get_be16(pb) / 10000.0;
-            codec->qblur = get_be16(pb) / 10000.0;
-            codec->bit_rate_tolerance = get_be32(pb);
-            codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf)));
-            codec->rc_max_rate = get_be32(pb);
-            codec->rc_min_rate = get_be32(pb);
-            codec->rc_buffer_size = get_be32(pb);
-            codec->i_quant_factor = av_int2dbl(get_be64(pb));
-            codec->b_quant_factor = av_int2dbl(get_be64(pb));
-            codec->i_quant_offset = av_int2dbl(get_be64(pb));
-            codec->b_quant_offset = av_int2dbl(get_be64(pb));
-            codec->dct_algo = get_be32(pb);
-            codec->strict_std_compliance = get_be32(pb);
-            codec->max_b_frames = get_be32(pb);
-            codec->luma_elim_threshold = get_be32(pb);
-            codec->chroma_elim_threshold = get_be32(pb);
-            codec->mpeg_quant = get_be32(pb);
-            codec->intra_dc_precision = get_be32(pb);
-            codec->me_method = get_be32(pb);
-            codec->mb_decision = get_be32(pb);
-            codec->nsse_weight = get_be32(pb);
-            codec->frame_skip_cmp = get_be32(pb);
-            codec->rc_buffer_aggressivity = av_int2dbl(get_be64(pb));
-            codec->codec_tag = get_be32(pb);
-            break;
-        case CODEC_TYPE_AUDIO:
-            codec->sample_rate = get_be32(pb);
-            codec->channels = get_le16(pb);
-            codec->frame_size = get_le16(pb);
-            break;
-        default:
-            goto fail;
-        }
-
-    }
-
-    /* get until end of block reached */
-    while ((url_ftell(pb) % ffm->packet_size) != 0)
-        get_byte(pb);
-
-    /* init packet demux */
-    ffm->packet_ptr = ffm->packet;
-    ffm->packet_end = ffm->packet;
-    ffm->frame_offset = 0;
-    ffm->pts = 0;
-    ffm->read_state = READ_HEADER;
-    ffm->first_packet = 1;
-    return 0;
- fail:
-    for(i=0;i<s->nb_streams;i++) {
-        st = s->streams[i];
-        if (st) {
-            av_freep(&st->priv_data);
-            av_free(st);
-        }
-    }
-    return -1;
-}
-
-/* return < 0 if eof */
-static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
-{
-    int size;
-    FFMContext *ffm = s->priv_data;
-    int duration;
-
-    switch(ffm->read_state) {
-    case READ_HEADER:
-        if (!ffm_is_avail_data(s, FRAME_HEADER_SIZE)) {
-            return AVERROR(EAGAIN);
-        }
-#if 0
-        printf("pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
-               url_ftell(s->pb), s->pb.pos, ffm->write_index, ffm->file_size);
-#endif
-        if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
-            FRAME_HEADER_SIZE)
-            return AVERROR(EAGAIN);
-#if 0
-        {
-            int i;
-            for(i=0;i<FRAME_HEADER_SIZE;i++)
-                printf("%02x ", ffm->header[i]);
-            printf("\n");
-        }
-#endif
-        ffm->read_state = READ_DATA;
-        /* fall thru */
-    case READ_DATA:
-        size = AV_RB24(ffm->header + 2);
-        if (!ffm_is_avail_data(s, size)) {
-            return AVERROR(EAGAIN);
-        }
-
-        duration = AV_RB24(ffm->header + 5);
-
-        av_new_packet(pkt, size);
-        pkt->stream_index = ffm->header[0];
-        if ((unsigned)pkt->stream_index >= s->nb_streams) {
-            av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index);
-            av_free_packet(pkt);
-            ffm->read_state = READ_HEADER;
-            return AVERROR(EAGAIN);
-        }
-        pkt->pos = url_ftell(s->pb);
-        if (ffm->header[1] & FLAG_KEY_FRAME)
-            pkt->flags |= PKT_FLAG_KEY;
-
-        ffm->read_state = READ_HEADER;
-        if (ffm_read_data(s, pkt->data, size, 0) != size) {
-            /* bad case: desynchronized packet. we cancel all the packet loading */
-            av_free_packet(pkt);
-            return AVERROR(EAGAIN);
-        }
-        if (ffm->first_frame_in_packet)
-        {
-            pkt->pts = ffm->pts;
-            ffm->first_frame_in_packet = 0;
-        }
-        pkt->duration = duration;
-        break;
-    }
-    return 0;
-}
-
-//#define DEBUG_SEEK
-
-/* pos is between 0 and file_size - FFM_PACKET_SIZE. It is translated
-   by the write position inside this function */
-static void ffm_seek1(AVFormatContext *s, offset_t pos1)
-{
-    FFMContext *ffm = s->priv_data;
-    ByteIOContext *pb = s->pb;
-    offset_t pos;
-
-    pos = pos1 + ffm->write_index;
-    if (pos >= ffm->file_size)
-        pos -= (ffm->file_size - FFM_PACKET_SIZE);
-#ifdef DEBUG_SEEK
-    printf("seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos);
-#endif
-    url_fseek(pb, pos, SEEK_SET);
-}
-
-static int64_t get_pts(AVFormatContext *s, offset_t pos)
-{
-    ByteIOContext *pb = s->pb;
-    int64_t pts;
-
-    ffm_seek1(s, pos);
-    url_fskip(pb, 4);
-    pts = get_be64(pb);
-#ifdef DEBUG_SEEK
-    printf("pts=%0.6f\n", pts / 1000000.0);
-#endif
-    return pts;
-}
-
-/* seek to a given time in the file. The file read pointer is
-   positioned at or before pts. XXX: the following code is quite
-   approximative */
-static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags)
-{
-    FFMContext *ffm = s->priv_data;
-    offset_t pos_min, pos_max, pos;
-    int64_t pts_min, pts_max, pts;
-    double pos1;
-
-#ifdef DEBUG_SEEK
-    printf("wanted_pts=%0.6f\n", wanted_pts / 1000000.0);
-#endif
-    /* find the position using linear interpolation (better than
-       dichotomy in typical cases) */
-    pos_min = 0;
-    pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE;
-    while (pos_min <= pos_max) {
-        pts_min = get_pts(s, pos_min);
-        pts_max = get_pts(s, pos_max);
-        /* linear interpolation */
-        pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) /
-            (double)(pts_max - pts_min);
-        pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE;
-        if (pos <= pos_min)
-            pos = pos_min;
-        else if (pos >= pos_max)
-            pos = pos_max;
-        pts = get_pts(s, pos);
-        /* check if we are lucky */
-        if (pts == wanted_pts) {
-            goto found;
-        } else if (pts > wanted_pts) {
-            pos_max = pos - FFM_PACKET_SIZE;
-        } else {
-            pos_min = pos + FFM_PACKET_SIZE;
-        }
-    }
-    pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
-    if (pos > 0)
-        pos -= FFM_PACKET_SIZE;
- found:
-    ffm_seek1(s, pos);
-    return 0;
-}
-
-#ifdef CONFIG_FFSERVER
-offset_t ffm_read_write_index(int fd)
-{
-    uint8_t buf[8];
-
-    lseek(fd, 8, SEEK_SET);
-    read(fd, buf, 8);
-    return AV_RB64(buf);
-}
-
-void ffm_write_write_index(int fd, offset_t pos)
-{
-    uint8_t buf[8];
-    int i;
-
-    for(i=0;i<8;i++)
-        buf[i] = (pos >> (56 - i * 8)) & 0xff;
-    lseek(fd, 8, SEEK_SET);
-    write(fd, buf, 8);
-}
-
-void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size)
-{
-    FFMContext *ffm = s->priv_data;
-    ffm->write_index = pos;
-    ffm->file_size = file_size;
-}
-#endif // CONFIG_FFSERVER
-
-static int ffm_read_close(AVFormatContext *s)
-{
-    AVStream *st;
-    int i;
-
-    for(i=0;i<s->nb_streams;i++) {
-        st = s->streams[i];
-        av_freep(&st->priv_data);
-    }
-    return 0;
-}
-
-static int ffm_probe(AVProbeData *p)
-{
-    if (
-        p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' &&
-        p->buf[3] == '1')
-        return AVPROBE_SCORE_MAX + 1;
-    return 0;
-}
-
-#ifdef CONFIG_FFM_DEMUXER
-AVInputFormat ffm_demuxer = {
-    "ffm",
-    "ffm format",
-    sizeof(FFMContext),
-    ffm_probe,
-    ffm_read_header,
-    ffm_read_packet,
-    ffm_read_close,
-    ffm_seek,
-};
-#endif
-#ifdef CONFIG_FFM_MUXER
-AVOutputFormat ffm_muxer = {
-    "ffm",
-    "ffm format",
-    "",
-    "ffm",
-    sizeof(FFMContext),
-    /* not really used */
-    CODEC_ID_MP2,
-    CODEC_ID_MPEG1VIDEO,
-    ffm_write_header,
-    ffm_write_packet,
-    ffm_write_trailer,
-};
-#endif //CONFIG_FFM_MUXER