img2: split muxer and demuxer into separate files

Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 322 insertions, 0 deletions

diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
new file mode 100644
index 0000000000..b4b9723bcd
--- /dev/null
+++ b/libavformat/img2dec.c
@@ -0,0 +1,322 @@
+/*
+ * Image format
+ * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
+ * Copyright (c) 2004 Michael Niedermayer
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#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"
+
+typedef struct {
+    const AVClass *class;  /**< Class for private options. */
+    int img_first;
+    int img_last;
+    int img_number;
+    int img_count;
+    int is_pipe;
+    char path[1024];
+    char *pixel_format;     /**< Set by a private option. */
+    char *video_size;       /**< Set by a private option. */
+    char *framerate;        /**< Set by a private option. */
+    int loop;
+} 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;
+}
+
+/* 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 (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 == 5)
+        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 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
+            return AVPROBE_SCORE_MAX/2;
+    }
+    return 0;
+}
+
+static int read_header(AVFormatContext *s1)
+{
+    VideoDemuxData *s = s1->priv_data;
+    int first_index, last_index, ret = 0;
+    int width = 0, height = 0;
+    AVStream *st;
+    enum PixelFormat pix_fmt = PIX_FMT_NONE;
+    AVRational framerate;
+
+    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)) == PIX_FMT_NONE) {
+        av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n", s->pixel_format);
+        return AVERROR(EINVAL);
+    }
+    if (s->video_size && (ret = av_parse_video_size(&width, &height, s->video_size)) < 0) {
+        av_log(s, AV_LOG_ERROR, "Could not parse video size: %s.\n", s->video_size);
+        return ret;
+    }
+    if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
+        av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s->framerate);
+        return ret;
+    }
+
+    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;
+    }
+
+    avpriv_set_pts_info(st, 60, framerate.den, framerate.num);
+
+    if (width && height) {
+        st->codec->width  = width;
+        st->codec->height = height;
+    }
+
+    if (!s->is_pipe) {
+        if (find_image_range(&first_index, &last_index, s->path) < 0)
+            return AVERROR(ENOENT);
+        s->img_first = first_index;
+        s->img_last = last_index;
+        s->img_number = first_index;
+        /* compute duration */
+        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{
+        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+        st->codec->codec_id = ff_guess_image2_codec(s->path);
+    }
+    if(st->codec->codec_type == AVMEDIA_TYPE_VIDEO && pix_fmt != PIX_FMT_NONE)
+        st->codec->pix_fmt = pix_fmt;
+
+    return 0;
+}
+
+static int read_packet(AVFormatContext *s1, AVPacket *pkt)
+{
+    VideoDemuxData *s = s1->priv_data;
+    char filename[1024];
+    int i;
+    int size[3]={0}, ret[3]={0};
+    AVIOContext *f[3];
+    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 (av_get_frame_filename(filename, sizeof(filename),
+                                  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(codec->codec_id != CODEC_ID_RAWVIDEO)
+                break;
+            filename[ strlen(filename) - 1 ]= 'U' + i;
+        }
+
+        if(codec->codec_id == CODEC_ID_RAWVIDEO && !codec->width)
+            infer_size(&codec->width, &codec->height, size[0]);
+    } else {
+        f[0] = s1->pb;
+        if (f[0]->eof_reached)
+            return AVERROR(EIO);
+        size[0]= 4096;
+    }
+
+    av_new_packet(pkt, size[0] + size[1] + size[2]);
+    pkt->stream_index = 0;
+    pkt->flags |= AV_PKT_FLAG_KEY;
+
+    pkt->size= 0;
+    for(i=0; i<3; i++){
+        if(size[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++;
+        return 0;
+    }
+}
+
+#define OFFSET(x) offsetof(VideoDemuxData, x)
+#define DEC AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+    { "pixel_format", "", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
+    { "video_size",   "", OFFSET(video_size),   AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
+    { "framerate",    "", OFFSET(framerate),    AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0, DEC },
+    { "loop",         "", OFFSET(loop),         AV_OPT_TYPE_INT,    {.dbl = 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     = read_probe,
+    .read_header    = read_header,
+    .read_packet    = read_packet,
+    .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    = read_header,
+    .read_packet    = read_packet,
+    .priv_class     = &img2pipe_class,
+};
+#endif