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/*

 * Image format

 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard

 * Copyright (c) 2004 Michael Niedermayer

 *

 * 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 

#include "libavutil/avstring.h"

#include "libavutil/log.h"

#include "libavutil/opt.h"

#include "libavutil/pixdesc.h"

#include "libavutil/parseutils.h"

#include "avformat.h"

#include "internal.h"

#if HAVE_GLOB

#include 

/* Locally define as 0 (bitwise-OR no-op) any missing glob options that

   are non-posix glibc/bsd extensions. */

#ifndef GLOB_NOMAGIC

#define GLOB_NOMAGIC 0

#endif

#ifndef GLOB_BRACE

#define GLOB_BRACE 0

#endif

#endif /* HAVE_GLOB */

typedef struct {

    const AVClass *class;  /**< Class for private options. */

    int img_first;

    int img_last;

    int img_number;

    int64_t pts;

    int img_count;

    int is_pipe;

    int split_planes;       /**< use independent file for each Y, U, V plane */

    char path[1024];

    char *pixel_format;     /**< Set by a private option. */

    int width, height;      /**< Set by a private option. */

    AVRational framerate;   /**< Set by a private option. */

    int loop;

    enum { PT_GLOB_SEQUENCE, PT_GLOB, PT_SEQUENCE } pattern_type;

    int use_glob;

#if HAVE_GLOB

    glob_t globstate;

#endif

    int start_number;

    int start_number_range;

    int frame_size;

    int ts_from_file;

} VideoDemuxData;

static const int sizes[][2] = {

    { 640, 480 },

    { 720, 480 },

    { 720, 576 },

    { 352, 288 },

    { 352, 240 },

    { 160, 128 },

    { 512, 384 },

    { 640, 352 },

    { 640, 240 },

};

static int infer_size(int *width_ptr, int *height_ptr, int size)

{

    int i;

    for (i = 0; i < FF_ARRAY_ELEMS(sizes); i++) {

        if ((sizes[i][0] * sizes[i][1]) == size) {

            *width_ptr  = sizes[i][0];

            *height_ptr = sizes[i][1];

            return 0;

        }

    }

    return -1;

}

static int is_glob(const char *path)

{

#if HAVE_GLOB

    size_t span = 0;

    const char *p = path;

    while (p = strchr(p, '%')) {

        if (*(++p) == '%') {

            ++p;

            continue;

        }

        if (span = strspn(p, "*?[]{}"))

            break;

    }

    /* Did we hit a glob char or get to the end? */

    return span != 0;

#else

    return 0;

#endif

}

/**

 * Get index range of image files matched by path.

 *

 * @param pfirst_index pointer to index updated with the first number in the range

 * @param plast_index  pointer to index updated with the last number in the range

 * @param path         path which has to be matched by the image files in the range

 * @param start_index  minimum accepted value for the first index in the range

 * @return -1 if no image file could be found

 */

static int find_image_range(int *pfirst_index, int *plast_index,

                            const char *path, int start_index, int start_index_range)

{

    char buf[1024];

    int range, last_index, range1, first_index;

    /* find the first image */

    for (first_index = start_index; first_index < start_index + start_index_range; first_index++) {

        if (av_get_frame_filename(buf, sizeof(buf), path, first_index) < 0) {

            *pfirst_index =

            *plast_index  = 1;

            if (avio_check(buf, AVIO_FLAG_READ) > 0)

                return 0;

            return -1;

        }

        if (avio_check(buf, AVIO_FLAG_READ) > 0)

            break;

    }

    if (first_index == start_index + start_index_range)

        goto fail;

    /* find the last image */

    last_index = first_index;

    for (;;) {

        range = 0;

        for (;;) {

            if (!range)

                range1 = 1;

            else

                range1 = 2 * range;

            if (av_get_frame_filename(buf, sizeof(buf), path,

                                      last_index + range1) < 0)

                goto fail;

            if (avio_check(buf, AVIO_FLAG_READ) <= 0)

                break;

            range = range1;

            /* just in case... */

            if (range >= (1 << 30))

                goto fail;

        }

        /* we are sure than image last_index + range exists */

        if (!range)

            break;

        last_index += range;

    }

    *pfirst_index = first_index;

    *plast_index  = last_index;

    return 0;

fail:

    return -1;

}

static int img_read_probe(AVProbeData *p)

{

    if (p->filename && ff_guess_image2_codec(p->filename)) {

        if (av_filename_number_test(p->filename))

            return AVPROBE_SCORE_MAX;

        else if (is_glob(p->filename))

            return AVPROBE_SCORE_MAX;

        else if (av_match_ext(p->filename, "raw") || av_match_ext(p->filename, "gif"))

            return 5;

        else

            return AVPROBE_SCORE_EXTENSION;

    }

    return 0;

}

static int img_read_header(AVFormatContext *s1)

{

    VideoDemuxData *s = s1->priv_data;

    int first_index, last_index;

    AVStream *st;

    enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;

    s1->ctx_flags |= AVFMTCTX_NOHEADER;

    st = avformat_new_stream(s1, NULL);

    if (!st) {

        return AVERROR(ENOMEM);

    }

    if (s->pixel_format &&

        (pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {

        av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",

               s->pixel_format);

        return AVERROR(EINVAL);

    }

    av_strlcpy(s->path, s1->filename, sizeof(s->path));

    s->img_number = 0;

    s->img_count  = 0;

    /* find format */

    if (s1->iformat->flags & AVFMT_NOFILE)

        s->is_pipe = 0;

    else {

        s->is_pipe       = 1;

        st->need_parsing = AVSTREAM_PARSE_FULL;

    }

    if (s->ts_from_file)

        avpriv_set_pts_info(st, 64, 1, 1);

    else

        avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);

    if (s->width && s->height) {

        st->codec->width  = s->width;

        st->codec->height = s->height;

    }

    if (!s->is_pipe) {

        if (s->pattern_type == PT_GLOB_SEQUENCE) {

        s->use_glob = is_glob(s->path);

        if (s->use_glob) {

            char *p = s->path, *q, *dup;

            int gerr;

            av_log(s1, AV_LOG_WARNING, "Pattern type 'glob_sequence' is deprecated: "

                   "use pattern_type 'glob' instead\n");

#if HAVE_GLOB

            dup = q = av_strdup(p);

            while (*q) {

                /* Do we have room for the next char and a \ insertion? */

                if ((p - s->path) >= (sizeof(s->path) - 2))

                  break;

                if (*q == '%' && strspn(q + 1, "%*?[]{}"))

                    ++q;

                else if (strspn(q, "\\*?[]{}"))

                    *p++ = '\\';

                *p++ = *q++;

            }

            *p = 0;

            av_free(dup);

            gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);

            if (gerr != 0) {

                return AVERROR(ENOENT);

            }

            first_index = 0;

            last_index = s->globstate.gl_pathc - 1;

#endif

        }

        }

        if ((s->pattern_type == PT_GLOB_SEQUENCE && !s->use_glob) || s->pattern_type == PT_SEQUENCE) {

            if (find_image_range(&first_index, &last_index, s->path,

                                 s->start_number, s->start_number_range) < 0) {

                av_log(s1, AV_LOG_ERROR,

                       "Could find no file with path '%s' and index in the range %d-%d\n",

                       s->path, s->start_number, s->start_number + s->start_number_range - 1);

                return AVERROR(ENOENT);

            }

        } else if (s->pattern_type == PT_GLOB) {

#if HAVE_GLOB

            int gerr;

            gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);

            if (gerr != 0) {

                return AVERROR(ENOENT);

            }

            first_index = 0;

            last_index = s->globstate.gl_pathc - 1;

            s->use_glob = 1;

#else

            av_log(s1, AV_LOG_ERROR,

                   "Pattern type 'glob' was selected but globbing "

                   "is not supported by this libavformat build\n");

            return AVERROR(ENOSYS);

#endif

        } else if (s->pattern_type != PT_GLOB_SEQUENCE) {

            av_log(s1, AV_LOG_ERROR,

                   "Unknown value '%d' for pattern_type option\n", s->pattern_type);

            return AVERROR(EINVAL);

        }

        s->img_first  = first_index;

        s->img_last   = last_index;

        s->img_number = first_index;

        /* compute duration */

        if (!s->ts_from_file) {

            st->start_time = 0;

            st->duration   = last_index - first_index + 1;

        }

    }

    if (s1->video_codec_id) {

        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

        st->codec->codec_id   = s1->video_codec_id;

    } else if (s1->audio_codec_id) {

        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

        st->codec->codec_id   = s1->audio_codec_id;

    } else {

        const char *str = strrchr(s->path, '.');

        s->split_planes       = str && !av_strcasecmp(str + 1, "y");

        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

        st->codec->codec_id   = ff_guess_image2_codec(s->path);

        if (st->codec->codec_id == AV_CODEC_ID_LJPEG)

            st->codec->codec_id = AV_CODEC_ID_MJPEG;

    }

    if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&

        pix_fmt != AV_PIX_FMT_NONE)

        st->codec->pix_fmt = pix_fmt;

    return 0;

}

static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)

{

    VideoDemuxData *s = s1->priv_data;

    char filename_bytes[1024];

    char *filename = filename_bytes;

    int i;

    int size[3]           = { 0 }, ret[3] = { 0 };

    AVIOContext *f[3]     = { NULL };

    AVCodecContext *codec = s1->streams[0]->codec;

    if (!s->is_pipe) {

        /* loop over input */

        if (s->loop && s->img_number > s->img_last) {

            s->img_number = s->img_first;

        }

        if (s->img_number > s->img_last)

            return AVERROR_EOF;

        if (s->use_glob) {

#if HAVE_GLOB

            filename = s->globstate.gl_pathv[s->img_number];

#endif

        } else {

        if (av_get_frame_filename(filename_bytes, sizeof(filename_bytes),

                                  s->path,

                                  s->img_number) < 0 && s->img_number > 1)

            return AVERROR(EIO);

        }

        for (i = 0; i < 3; i++) {

            if (avio_open2(&f[i], filename, AVIO_FLAG_READ,

                           &s1->interrupt_callback, NULL) < 0) {

                if (i >= 1)

                    break;

                av_log(s1, AV_LOG_ERROR, "Could not open file : %s\n",

                       filename);

                return AVERROR(EIO);

            }

            size[i] = avio_size(f[i]);

            if (!s->split_planes)

                break;

            filename[strlen(filename) - 1] = 'U' + i;

        }

        if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->width)

            infer_size(&codec->width, &codec->height, size[0]);

    } else {

        f[0] = s1->pb;

        if (url_feof(f[0]))

            return AVERROR(EIO);

        if (s->frame_size > 0) {

            size[0] = s->frame_size;

        } else {

            size[0] = 4096;

        }

    }

    if (av_new_packet(pkt, size[0] + size[1] + size[2]) < 0)

        return AVERROR(ENOMEM);

    pkt->stream_index = 0;

    pkt->flags       |= AV_PKT_FLAG_KEY;

/*

    if (s->ts_from_file) {

        struct stat img_stat;

        if (stat(filename, &img_stat))

            return AVERROR(EIO);

        pkt->pts = (int64_t)img_stat.st_mtime;

        av_add_index_entry(s1->streams[0], s->img_number, pkt->pts, 0, 0, AVINDEX_KEYFRAME);

    } else if (!s->is_pipe) {

        pkt->pts      = s->pts;

    }

*/

    pkt->size = 0;

    for (i = 0; i < 3; i++) {

        if (f[i]) {

            ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);

            if (!s->is_pipe)

                avio_close(f[i]);

            if (ret[i] > 0)

                pkt->size += ret[i];

        }

    }

    if (ret[0] <= 0 || ret[1] < 0 || ret[2] < 0) {

        av_free_packet(pkt);

        return AVERROR(EIO); /* signal EOF */

    } else {

        s->img_count++;

        s->img_number++;

        s->pts++;

        return 0;

    }

}

static int img_read_close(struct AVFormatContext* s1)

{

    VideoDemuxData *s = s1->priv_data;

#if HAVE_GLOB

    if (s->use_glob) {

        globfree(&s->globstate);

    }

#endif

    return 0;

}

static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)

{

    VideoDemuxData *s1 = s->priv_data;

    AVStream *st = s->streams[0];

    if (s1->ts_from_file) {

        int index = av_index_search_timestamp(st, timestamp, flags);

        if(index < 0)

            return -1;

        s1->img_number = st->index_entries[index].pos;

        return 0;

    }

    if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first)

        return -1;

    s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first;

    s1->pts = timestamp;

    return 0;

}

#define OFFSET(x) offsetof(VideoDemuxData, x)

#define DEC AV_OPT_FLAG_DECODING_PARAM

static const AVOption options[] = {

    { "framerate",    "set the video framerate",             OFFSET(framerate),    AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0,   DEC },

    { "loop",         "force loop over input file sequence", OFFSET(loop),         AV_OPT_TYPE_INT,    {.i64 = 0   }, 0, 1,       DEC },

    { "pattern_type", "set pattern type",                    OFFSET(pattern_type), AV_OPT_TYPE_INT,    {.i64=PT_GLOB_SEQUENCE}, 0,       INT_MAX, DEC, "pattern_type"},

    { "glob_sequence","select glob/sequence pattern type",   0, AV_OPT_TYPE_CONST,  {.i64=PT_GLOB_SEQUENCE}, INT_MIN, INT_MAX, DEC, "pattern_type" },

    { "glob",         "select glob pattern type",            0, AV_OPT_TYPE_CONST,  {.i64=PT_GLOB         }, INT_MIN, INT_MAX, DEC, "pattern_type" },

    { "sequence",     "select sequence pattern type",        0, AV_OPT_TYPE_CONST,  {.i64=PT_SEQUENCE     }, INT_MIN, INT_MAX, DEC, "pattern_type" },

    { "pixel_format", "set video pixel format",              OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0,       DEC },

    { "start_number", "set first number in the sequence",    OFFSET(start_number), AV_OPT_TYPE_INT,    {.i64 = 0   }, 0, INT_MAX, DEC },

    { "start_number_range", "set range for looking at the first sequence number", OFFSET(start_number_range), AV_OPT_TYPE_INT, {.i64 = 5}, 1, INT_MAX, DEC },

    { "video_size",   "set video size",                      OFFSET(width),        AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0,   DEC },

    { "frame_size",   "force frame size in bytes",           OFFSET(frame_size),   AV_OPT_TYPE_INT,    {.i64 = 0   }, 0, INT_MAX, DEC },

    { "ts_from_file", "set frame timestamp from file's one", OFFSET(ts_from_file), AV_OPT_TYPE_INT,    {.i64 = 0   }, 0, 1,       DEC },

    { NULL },

};

#if CONFIG_IMAGE2_DEMUXER

static const AVClass img2_class = {

    .class_name = "image2 demuxer",

    .item_name  = av_default_item_name,

    .option     = options,

    .version    = LIBAVUTIL_VERSION_INT,

};

AVInputFormat ff_image2_demuxer = {

    .name           = "image2",

    .long_name      = NULL_IF_CONFIG_SMALL("image2 sequence"),

    .priv_data_size = sizeof(VideoDemuxData),

    .read_probe     = img_read_probe,

    .read_header    = img_read_header,

    .read_packet    = img_read_packet,

    .read_close     = img_read_close,

    .read_seek      = img_read_seek,

    .flags          = AVFMT_NOFILE,

    .priv_class     = &img2_class,

};

#endif

#if CONFIG_IMAGE2PIPE_DEMUXER

static const AVClass img2pipe_class = {

    .class_name = "image2pipe demuxer",

    .item_name  = av_default_item_name,

    .option     = options,

    .version    = LIBAVUTIL_VERSION_INT,

};

AVInputFormat ff_image2pipe_demuxer = {

    .name           = "image2pipe",

    .long_name      = NULL_IF_CONFIG_SMALL("piped image2 sequence"),

    .priv_data_size = sizeof(VideoDemuxData),

    .read_header    = img_read_header,

    .read_packet    = img_read_packet,

    .priv_class     = &img2pipe_class,

};

#endif