flac: move picture parsing code in a separate file

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 152 insertions, 0 deletions

diff --git a/libavformat/flac_picture.c b/libavformat/flac_picture.c
new file mode 100644
index 0000000000..69d27244ff
--- /dev/null
+++ b/libavformat/flac_picture.c
@@ -0,0 +1,152 @@
+/*
+ * Raw FLAC picture parser
+ *
+ * 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 "avformat.h"
+#include "flac_picture.h"
+#include "id3v2.h"
+#include "internal.h"
+
+int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
+{
+    const CodecMime *mime = ff_id3v2_mime_tags;
+    enum AVCodecID id = AV_CODEC_ID_NONE;
+    AVBufferRef *data = NULL;
+    uint8_t mimetype[64], *desc = NULL;
+    AVIOContext *pb = NULL;
+    AVStream *st;
+    int type, width, height;
+    int len, ret = 0;
+
+    pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
+    if (!pb)
+        return AVERROR(ENOMEM);
+
+    /* read the picture type */
+    type = avio_rb32(pb);
+    if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
+        av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
+        if (s->error_recognition & AV_EF_EXPLODE) {
+            ret = AVERROR_INVALIDDATA;
+            goto fail;
+        }
+        type = 0;
+    }
+
+    /* picture mimetype */
+    len = avio_rb32(pb);
+    if (len <= 0 ||
+        avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
+        av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
+               "picture.\n");
+        if (s->error_recognition & AV_EF_EXPLODE)
+            ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+    mimetype[len] = 0;
+
+    while (mime->id != AV_CODEC_ID_NONE) {
+        if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
+            id = mime->id;
+            break;
+        }
+        mime++;
+    }
+    if (id == AV_CODEC_ID_NONE) {
+        av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
+               mimetype);
+        if (s->error_recognition & AV_EF_EXPLODE)
+            ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    /* picture description */
+    len = avio_rb32(pb);
+    if (len > 0) {
+        if (!(desc = av_malloc(len + 1))) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        if (avio_read(pb, desc, len) != len) {
+            av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
+            if (s->error_recognition & AV_EF_EXPLODE)
+                ret = AVERROR(EIO);
+            goto fail;
+        }
+        desc[len] = 0;
+    }
+
+    /* picture metadata */
+    width  = avio_rb32(pb);
+    height = avio_rb32(pb);
+    avio_skip(pb, 8);
+
+    /* picture data */
+    len = avio_rb32(pb);
+    if (len <= 0) {
+        av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
+        if (s->error_recognition & AV_EF_EXPLODE)
+            ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+    if (!(data = av_buffer_alloc(len))) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+    if (avio_read(pb, data->data, len) != len) {
+        av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
+        if (s->error_recognition & AV_EF_EXPLODE)
+            ret = AVERROR(EIO);
+        goto fail;
+    }
+
+    st = avformat_new_stream(s, NULL);
+    if (!st) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    av_init_packet(&st->attached_pic);
+    st->attached_pic.buf          = data;
+    st->attached_pic.data         = data->data;
+    st->attached_pic.size         = len;
+    st->attached_pic.stream_index = st->index;
+    st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
+
+    st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;
+    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id   = id;
+    st->codec->width      = width;
+    st->codec->height     = height;
+    av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
+    if (desc)
+        av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
+
+    av_freep(&pb);
+
+    return 0;
+
+fail:
+    av_buffer_unref(&data);
+    av_freep(&desc);
+    av_freep(&pb);
+
+    return ret;
+}