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ffmpeg / libavformat / img.c @ 5509bffa

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/*
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 * Image format
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 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
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 *
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 * This library 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 of the License, or (at your option) any later version.
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 *
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 * This library 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 this library; 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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#include "avformat.h"
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/* XXX: this is a hack */
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int loop_input = 0;
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typedef struct {
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    int width;
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    int height;
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    int img_first;
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    int img_last;
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    int img_number;
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    int img_count;
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    int img_size;
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    AVImageFormat *img_fmt;
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    int pix_fmt;
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    int is_pipe;
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    char path[1024];
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    /* temporary usage */
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    void *ptr;
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} VideoData;
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/* return -1 if no image found */
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static int find_image_range(int *pfirst_index, int *plast_index,
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                            const char *path)
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{
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    char buf[1024];
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    int range, last_index, range1, first_index;
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    /* find the first image */
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    for(first_index = 0; first_index < 5; first_index++) {
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        if (get_frame_filename(buf, sizeof(buf), path, first_index) < 0)
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            goto fail;
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        if (url_exist(buf))
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            break;
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    }
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    if (first_index == 5)
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        goto fail;
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    /* find the last image */
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    last_index = first_index;
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    for(;;) {
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        range = 0;
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        for(;;) {
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            if (!range)
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                range1 = 1;
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            else
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                range1 = 2 * range;
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            if (get_frame_filename(buf, sizeof(buf), path,
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                                   last_index + range1) < 0)
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                goto fail;
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            if (!url_exist(buf))
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                break;
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            range = range1;
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            /* just in case... */
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            if (range >= (1 << 30))
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                goto fail;
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        }
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        /* we are sure than image last_index + range exists */
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        if (!range)
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            break;
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        last_index += range;
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    }
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    *pfirst_index = first_index;
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    *plast_index = last_index;
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    return 0;
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 fail:
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    return -1;
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}
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static int image_probe(AVProbeData *p)
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{
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    if (filename_number_test(p->filename) >= 0 && guess_image_format(p->filename))
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        return AVPROBE_SCORE_MAX-1;
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    else
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        return 0;
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}
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static int read_header_alloc_cb(void *opaque, AVImageInfo *info)
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{
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    VideoData *s = opaque;
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    s->width = info->width;
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    s->height = info->height;
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    s->pix_fmt = info->pix_fmt;
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    /* stop image reading but no error */
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    return 1;
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}
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static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
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{
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    VideoData *s = s1->priv_data;
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    int ret, first_index, last_index;
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    char buf[1024];
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    ByteIOContext pb1, *f = &pb1;
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    AVStream *st;
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    st = av_new_stream(s1, 0);
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    if (!st) {
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        av_free(s);
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        return -ENOMEM;
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    }
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    if (ap && ap->image_format)
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        s->img_fmt = ap->image_format;
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    pstrcpy(s->path, sizeof(s->path), s1->filename);
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    s->img_number = 0;
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    s->img_count = 0;
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    /* find format */
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    if (s1->iformat->flags & AVFMT_NOFILE)
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        s->is_pipe = 0;
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    else
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        s->is_pipe = 1;
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    if (!ap || !ap->time_base.num) {
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        st->codec->time_base= (AVRational){1,25};
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    } else {
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        st->codec->time_base= ap->time_base;
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    }
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    if (!s->is_pipe) {
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        if (find_image_range(&first_index, &last_index, s->path) < 0)
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            goto fail;
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        s->img_first = first_index;
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        s->img_last = last_index;
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        s->img_number = first_index;
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        /* compute duration */
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        st->start_time = 0;
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        st->duration = last_index - first_index + 1;
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        if (get_frame_filename(buf, sizeof(buf), s->path, s->img_number) < 0)
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            goto fail;
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        if (url_fopen(f, buf, URL_RDONLY) < 0)
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            goto fail;
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    } else {
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        f = &s1->pb;
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    }
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    ret = av_read_image(f, s1->filename, s->img_fmt, read_header_alloc_cb, s);
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    if (ret < 0)
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        goto fail1;
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    if (!s->is_pipe) {
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        url_fclose(f);
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    } else {
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        url_fseek(f, 0, SEEK_SET);
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    }
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    st->codec->codec_type = CODEC_TYPE_VIDEO;
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    st->codec->codec_id = CODEC_ID_RAWVIDEO;
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    st->codec->width = s->width;
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    st->codec->height = s->height;
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    st->codec->pix_fmt = s->pix_fmt;
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    s->img_size = avpicture_get_size(s->pix_fmt, (s->width+15)&(~15), (s->height+15)&(~15));
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    return 0;
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 fail1:
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    if (!s->is_pipe)
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        url_fclose(f);
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 fail:
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    av_free(s);
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    return AVERROR_IO;
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}
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static int read_packet_alloc_cb(void *opaque, AVImageInfo *info)
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{
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    VideoData *s = opaque;
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    if (info->width != s->width ||
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        info->height != s->height)
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        return -1;
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    avpicture_fill(&info->pict, s->ptr, info->pix_fmt, (info->width+15)&(~15), (info->height+15)&(~15));
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    return 0;
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}
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static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)
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{
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    VideoData *s = s1->priv_data;
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    char filename[1024];
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    int ret;
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    ByteIOContext f1, *f;
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    if (!s->is_pipe) {
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        /* loop over input */
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        if (loop_input && s->img_number > s->img_last) {
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            s->img_number = s->img_first;
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        }
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        if (get_frame_filename(filename, sizeof(filename),
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                               s->path, s->img_number) < 0)
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            return AVERROR_IO;
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        f = &f1;
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        if (url_fopen(f, filename, URL_RDONLY) < 0)
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            return AVERROR_IO;
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    } else {
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        f = &s1->pb;
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        if (url_feof(f))
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            return AVERROR_IO;
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    }
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    av_new_packet(pkt, s->img_size);
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    pkt->stream_index = 0;
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    s->ptr = pkt->data;
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    ret = av_read_image(f, filename, s->img_fmt, read_packet_alloc_cb, s);
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    if (!s->is_pipe) {
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        url_fclose(f);
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    }
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    if (ret < 0) {
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        av_free_packet(pkt);
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        return AVERROR_IO; /* signal EOF */
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    } else {
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        /* XXX: computing this pts is not necessary as it is done in
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           the generic code too */
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        pkt->pts = av_rescale((int64_t)s->img_count * s1->streams[0]->codec->time_base.num, s1->streams[0]->time_base.den, s1->streams[0]->codec->time_base.den) / s1->streams[0]->time_base.num;
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        s->img_count++;
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        s->img_number++;
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        return 0;
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    }
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}
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static int img_read_close(AVFormatContext *s1)
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{
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    return 0;
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}
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/******************************************************/
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/* image output */
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static int img_set_parameters(AVFormatContext *s, AVFormatParameters *ap)
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{
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    VideoData *img = s->priv_data;
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    AVStream *st;
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    AVImageFormat *img_fmt;
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    int i;
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    /* find output image format */
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    if (ap && ap->image_format) {
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        img_fmt = ap->image_format;
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    } else {
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        img_fmt = guess_image_format(s->filename);
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    }
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    if (!img_fmt)
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        return -1;
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    if (s->nb_streams != 1)
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        return -1;
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    st = s->streams[0];
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    /* we select the first matching format */
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    for(i=0;i<PIX_FMT_NB;i++) {
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        if (img_fmt->supported_pixel_formats & (1 << i))
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            break;
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    }
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    if (i >= PIX_FMT_NB)
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        return -1;
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    img->img_fmt = img_fmt;
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    img->pix_fmt = i;
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    st->codec->pix_fmt = img->pix_fmt;
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    return 0;
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}
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static int img_write_header(AVFormatContext *s)
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{
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    VideoData *img = s->priv_data;
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    img->img_number = 1;
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    pstrcpy(img->path, sizeof(img->path), s->filename);
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    /* find format */
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    if (s->oformat->flags & AVFMT_NOFILE)
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        img->is_pipe = 0;
293
    else
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        img->is_pipe = 1;
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296
    return 0;
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}
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static int img_write_packet(AVFormatContext *s, AVPacket *pkt)
300
{
301
    VideoData *img = s->priv_data;
302
    AVStream *st = s->streams[pkt->stream_index];
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    ByteIOContext pb1, *pb;
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    AVPicture *picture;
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    int width, height, ret;
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    char filename[1024];
307
    AVImageInfo info;
308

    
309
    width = st->codec->width;
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    height = st->codec->height;
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    picture = (AVPicture *)pkt->data;
313

    
314
    if (!img->is_pipe) {
315
        if (get_frame_filename(filename, sizeof(filename),
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                               img->path, img->img_number) < 0)
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            return AVERROR_IO;
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        pb = &pb1;
319
        if (url_fopen(pb, filename, URL_WRONLY) < 0)
320
            return AVERROR_IO;
321
    } else {
322
        pb = &s->pb;
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    }
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    info.width = width;
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    info.height = height;
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    info.pix_fmt = st->codec->pix_fmt;
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    info.interleaved = 0;    /* FIXME: there should be a way to set it right */
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    info.pict = *picture;
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    ret = av_write_image(pb, img->img_fmt, &info);
330
    if (!img->is_pipe) {
331
        url_fclose(pb);
332
    }
333

    
334
    img->img_number++;
335
    return 0;
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}
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338
static int img_write_trailer(AVFormatContext *s)
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{
340
    return 0;
341
}
342

    
343
/* input */
344

    
345
static AVInputFormat image_iformat = {
346
    "image",
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    "image sequence",
348
    sizeof(VideoData),
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    image_probe,
350
    img_read_header,
351
    img_read_packet,
352
    img_read_close,
353
    NULL,
354
    NULL,
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    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
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};
357

    
358
static AVInputFormat imagepipe_iformat = {
359
    "imagepipe",
360
    "piped image sequence",
361
    sizeof(VideoData),
362
    NULL, /* no probe */
363
    img_read_header,
364
    img_read_packet,
365
    img_read_close,
366
    NULL,
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};
368

    
369

    
370
/* output */
371

    
372
static AVOutputFormat image_oformat = {
373
    "image",
374
    "image sequence",
375
    "",
376
    "",
377
    sizeof(VideoData),
378
    CODEC_ID_NONE,
379
    CODEC_ID_RAWVIDEO,
380
    img_write_header,
381
    img_write_packet,
382
    img_write_trailer,
383
    AVFMT_NOFILE | AVFMT_NEEDNUMBER | AVFMT_RAWPICTURE,
384
    img_set_parameters,
385
};
386

    
387
static AVOutputFormat imagepipe_oformat = {
388
    "imagepipe",
389
    "piped image sequence",
390
    "",
391
    "",
392
    sizeof(VideoData),
393
    CODEC_ID_NONE,
394
    CODEC_ID_RAWVIDEO,
395
    img_write_header,
396
    img_write_packet,
397
    img_write_trailer,
398
    AVFMT_RAWPICTURE,
399
    img_set_parameters,
400
};
401

    
402
int img_init(void)
403
{
404
    av_register_input_format(&image_iformat);
405
    av_register_output_format(&image_oformat);
406

    
407
    av_register_input_format(&imagepipe_iformat);
408
    av_register_output_format(&imagepipe_oformat);
409

    
410
    return 0;
411
}