flacdec: read attached pictures.

libavformat/flacdec.c

@@ -21,12 +21,127 @@
 
 #include "libavcodec/flac.h"
 #include "avformat.h"
+#include "id3v2.h"
 #include "internal.h"
 #include "rawdec.h"
 #include "oggdec.h"
 #include "vorbiscomment.h"
 #include "libavcodec/bytestream.h"
 
+static int parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
+{
+    const CodecMime *mime = ff_id3v2_mime_tags;
+    enum  CodecID      id = CODEC_ID_NONE;
+    uint8_t mimetype[64], *desc = NULL, *data = NULL;
+    AVIOContext *pb = NULL;
+    AVStream *st;
+    int type, width, height;
+    int len, ret = 0;
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    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);
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    /* 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");
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+    mimetype[len] = 0;
+
+    while (mime->id != CODEC_ID_NONE) {
+        if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
+            id = mime->id;
+            break;
+        }
+        mime++;
+    }
+    if (id == CODEC_ID_NONE) {
+        av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
+               mimetype);
+        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) {
+            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) {
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+    if (!(data = av_malloc(len))) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+    if (avio_read(pb, data, len) != len) {
+        ret = AVERROR(EIO);
+        goto fail;
+    }
+
+    av_init_packet(&st->attached_pic);
+    st->attached_pic.data         = data;
+    st->attached_pic.size         = len;
+    st->attached_pic.destruct     = av_destruct_packet;
+    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_freep(&desc);
+    av_freep(&data);
+    av_freep(&pb);
+    return ret;
+
+}
+
 static int flac_read_header(AVFormatContext *s)
 {
     int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
@@ -55,6 +170,7 @@ static int flac_read_header(AVFormatContext *s)
         /* allocate and read metadata block for supported types */
         case FLAC_METADATA_TYPE_STREAMINFO:
         case FLAC_METADATA_TYPE_CUESHEET:
+        case FLAC_METADATA_TYPE_PICTURE:
         case FLAC_METADATA_TYPE_VORBIS_COMMENT:
             buffer = av_mallocz(metadata_size + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!buffer) {
@@ -121,6 +237,13 @@ static int flac_read_header(AVFormatContext *s)
                 offset += ti * 12;
                 avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
             }
+        } else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
+            ret = parse_picture(s, buffer, metadata_size);
+            av_freep(&buffer);
+            if (ret < 0) {
+                av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");
+                return ret;
+            }
         } else {
             /* STREAMINFO must be the first block */
             if (!found_streaminfo) {