image2 / image API cleanup phase-1

with this its possible to encode&decode any video codec to individual (1 file per frame) files

Originally committed as revision 3319 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 370 insertions, 0 deletions

diff --git a/libavformat/img2.c b/libavformat/img2.c
new file mode 100644
index 0000000000..a31a0faf91
--- /dev/null
+++ b/libavformat/img2.c
@@ -0,0 +1,370 @@
+/*
+ * Image format
+ * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
+ * Copyright (c) 2004 Michael Niedermayer
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+
+typedef struct {
+    int img_first;
+    int img_last;
+    int img_number;
+    int img_count;
+    int is_pipe;
+    char path[1024];
+} VideoData;
+
+typedef struct {
+    enum CodecID id;
+    const char *str;
+} IdStrMap;
+
+static const IdStrMap img_tags[] = {
+    { CODEC_ID_MJPEG     , "jpeg"},
+    { CODEC_ID_MJPEG     , "jpg"},
+    { CODEC_ID_LJPEG     , "ljpg"},
+    { CODEC_ID_MPEG1VIDEO, "mpg1-img"},
+    { CODEC_ID_MPEG2VIDEO, "mpg2-img"},
+    { CODEC_ID_MPEG4     , "mpg4-img"},
+    { CODEC_ID_FFV1      , "ffv1-img"},
+    {0, NULL}
+};
+
+static enum CodecID av_str2id(const IdStrMap *tags, const char *str)
+{
+    while(*str && *str!='.') str++;
+    if(*str) str++;
+
+    while (tags->id) {
+        int i;
+        for(i=0; toupper(tags->str[i]) == toupper(str[i]); i++){
+            if(tags->str[i]==0 && str[i]==0)
+                return tags->id;
+        }
+
+        tags++;
+    }
+    return CODEC_ID_NONE;
+}
+
+static const char *av_id2str(const IdStrMap *tags, enum CodecID id)
+{
+    while (tags->id) {
+        if(tags->id == id)
+            return tags->str;
+        tags++;
+    }
+    return NULL;
+}
+
+/* return -1 if no image found */
+static int find_image_range(int *pfirst_index, int *plast_index, 
+                            const char *path)
+{
+    char buf[1024];
+    int range, last_index, range1, first_index;
+
+    /* find the first image */
+    for(first_index = 0; first_index < 5; first_index++) {
+        if (get_frame_filename(buf, sizeof(buf), path, first_index) < 0)
+            goto fail;
+        if (url_exist(buf))
+            break;
+    }
+    if (first_index == 5)
+        goto fail;
+    
+    /* find the last image */
+    last_index = first_index;
+    for(;;) {
+        range = 0;
+        for(;;) {
+            if (!range)
+                range1 = 1;
+            else
+                range1 = 2 * range;
+            if (get_frame_filename(buf, sizeof(buf), path, 
+                                   last_index + range1) < 0)
+                goto fail;
+            if (!url_exist(buf))
+                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 image_probe(AVProbeData *p)
+{
+    if (filename_number_test(p->filename) >= 0 && av_str2id(img_tags, p->filename))
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
+{
+    VideoData *s = s1->priv_data;
+    int first_index, last_index;
+    char buf[1024];
+    ByteIOContext pb1, *f = &pb1;
+    AVStream *st;
+
+    s1->ctx_flags |= AVFMTCTX_NOHEADER;
+
+    st = av_new_stream(s1, 0);
+    if (!st) {
+        av_free(s);
+        return -ENOMEM;
+    }
+
+    strcpy(s->path, s1->filename);
+    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;
+        
+    if (!ap || !ap->frame_rate) {
+        st->codec.frame_rate      = 25;
+        st->codec.frame_rate_base = 1;
+    } else {
+        st->codec.frame_rate      = ap->frame_rate;
+        st->codec.frame_rate_base = ap->frame_rate_base;
+    }
+    
+    if (!s->is_pipe) {
+        if (find_image_range(&first_index, &last_index, s->path) < 0)
+            goto fail;
+        s->img_first = first_index;
+        s->img_last = last_index;
+        s->img_number = first_index;
+        /* compute duration */
+        st->start_time = 0;
+        st->duration = ((int64_t)AV_TIME_BASE * 
+                        (last_index - first_index + 1) * 
+                        st->codec.frame_rate_base) / st->codec.frame_rate;
+        if (get_frame_filename(buf, sizeof(buf), s->path, s->img_number) < 0)
+            goto fail;
+        if (url_fopen(f, buf, URL_RDONLY) < 0)
+            goto fail;
+    } else {
+        f = &s1->pb;
+    }
+    
+    if (!s->is_pipe) {
+        url_fclose(f);
+    } else {
+        url_fseek(f, 0, SEEK_SET);
+    }
+    
+    st->codec.codec_type = CODEC_TYPE_VIDEO;
+    st->codec.codec_id = av_str2id(img_tags, s->path);
+
+    return 0;
+ 
+    if (!s->is_pipe)
+        url_fclose(f);
+ fail:
+    av_free(s);
+    return AVERROR_IO;
+}
+
+static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)
+{
+    VideoData *s = s1->priv_data;
+    char filename[1024];
+    int ret;
+    ByteIOContext f1, *f;
+
+    if (!s->is_pipe) {
+        /* loop over input */
+/*        if (loop_input && s->img_number > s->img_last) {
+            s->img_number = s->img_first;
+        }*/
+        if (get_frame_filename(filename, sizeof(filename),
+                               s->path, s->img_number) < 0)
+            return AVERROR_IO;
+        f = &f1;
+        if (url_fopen(f, filename, URL_RDONLY) < 0)
+            return AVERROR_IO;
+    } else {
+        f = &s1->pb;
+        if (url_feof(f))
+            return AVERROR_IO;
+    }
+
+    if (s->is_pipe) {
+        av_new_packet(pkt, 4096);
+    }else{
+        av_new_packet(pkt, url_filesize(url_fileno(f)));
+    }
+    pkt->stream_index = 0;
+    pkt->flags |= PKT_FLAG_KEY;
+
+    ret = get_buffer(f, pkt->data, pkt->size);
+    if (!s->is_pipe) {
+        url_fclose(f);
+    }
+
+    if (ret <= 0) {
+        av_free_packet(pkt);
+        return AVERROR_IO; /* signal EOF */
+    } else {
+        s->img_count++;
+        s->img_number++;
+        return 0;
+    }
+}
+
+static int img_read_close(AVFormatContext *s1)
+{
+    return 0;
+}
+
+/******************************************************/
+/* image output */
+
+static int img_write_header(AVFormatContext *s)
+{
+    VideoData *img = s->priv_data;
+
+    img->img_number = 1;
+    strcpy(img->path, s->filename);
+
+    /* find format */
+    if (s->oformat->flags & AVFMT_NOFILE)
+        img->is_pipe = 0;
+    else
+        img->is_pipe = 1;
+        
+    return 0;
+}
+
+static int img_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    VideoData *img = s->priv_data;
+    ByteIOContext pb1, *pb;
+    char filename[1024];
+
+    if (!img->is_pipe) {
+        if (get_frame_filename(filename, sizeof(filename), 
+                               img->path, img->img_number) < 0)
+            return AVERROR_IO;
+        pb = &pb1;
+        if (url_fopen(pb, filename, URL_WRONLY) < 0)
+            return AVERROR_IO;
+    } else {
+        pb = &s->pb;
+    }
+
+    put_buffer(pb, pkt->data, pkt->size);
+    put_flush_packet(pb);
+    if (!img->is_pipe) {
+        url_fclose(pb);
+    }
+
+    img->img_number++;
+    return 0;
+}
+
+static int img_write_trailer(AVFormatContext *s)
+{
+    return 0;
+}
+
+/* input */
+
+static AVInputFormat image2_iformat = {
+    "image2",
+    "image2 sequence",
+    sizeof(VideoData),
+    image_probe,
+    img_read_header,
+    img_read_packet,
+    img_read_close,
+    NULL,
+    NULL,
+    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
+};
+
+static AVInputFormat image2pipe_iformat = {
+    "image2pipe",
+    "piped image2 sequence",
+    sizeof(VideoData),
+    NULL, /* no probe */
+    img_read_header,
+    img_read_packet,
+    img_read_close,
+    NULL,
+};
+
+
+/* output */
+
+static AVOutputFormat image2_oformat = {
+    "image2",
+    "image2 sequence",
+    "",
+    "",
+    sizeof(VideoData),
+    CODEC_ID_NONE,
+    CODEC_ID_MJPEG,
+    img_write_header,
+    img_write_packet,
+    img_write_trailer,
+    AVFMT_NOFILE | AVFMT_NEEDNUMBER,
+};
+
+static AVOutputFormat image2pipe_oformat = {
+    "image2pipe",
+    "piped image2 sequence",
+    "",
+    "",
+    sizeof(VideoData),
+    CODEC_ID_NONE,
+    CODEC_ID_MJPEG,
+    img_write_header,
+    img_write_packet,
+    img_write_trailer,
+};
+
+int img2_init(void)
+{
+    av_register_input_format(&image2_iformat);
+    av_register_output_format(&image2_oformat);
+
+    av_register_input_format(&image2pipe_iformat);
+    av_register_output_format(&image2pipe_oformat);
+    
+    return 0;
+}