making act segmenter

1 files changed, 295 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/flacdec.c b/ffmpeg/libavformat/flacdec.c
new file mode 100644
index 0000000..d5aacfd
--- /dev/null
+++ b/ffmpeg/libavformat/flacdec.c
@@ -0,0 +1,295 @@
+/*
+ * Raw FLAC demuxer
+ * Copyright (c) 2001 Fabrice Bellard
+ *
+ * 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 "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"
+
+#define RETURN_ERROR(code) do { ret = (code); goto fail; } while (0)
+
+static int 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) {
+            RETURN_ERROR(AVERROR_INVALIDDATA);
+        }
+        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))) {
+            RETURN_ERROR(AVERROR(ENOMEM));
+        }
+
+        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))) {
+        RETURN_ERROR(AVERROR(ENOMEM));
+    }
+    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) {
+        RETURN_ERROR(AVERROR(ENOMEM));
+    }
+
+    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;
+
+}
+
+static int flac_read_header(AVFormatContext *s)
+{
+    int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
+    uint8_t header[4];
+    uint8_t *buffer=NULL;
+    AVStream *st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id = AV_CODEC_ID_FLAC;
+    st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
+    /* the parameters will be extracted from the compressed bitstream */
+
+    /* if fLaC marker is not found, assume there is no header */
+    if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) {
+        avio_seek(s->pb, -4, SEEK_CUR);
+        return 0;
+    }
+
+    /* process metadata blocks */
+    while (!url_feof(s->pb) && !metadata_last) {
+        avio_read(s->pb, header, 4);
+        avpriv_flac_parse_block_header(header, &metadata_last, &metadata_type,
+                                   &metadata_size);
+        switch (metadata_type) {
+        /* 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) {
+                return AVERROR(ENOMEM);
+            }
+            if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
+                RETURN_ERROR(AVERROR(EIO));
+            }
+            break;
+        /* skip metadata block for unsupported types */
+        default:
+            ret = avio_skip(s->pb, metadata_size);
+            if (ret < 0)
+                return ret;
+        }
+
+        if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
+            FLACStreaminfo si;
+            /* STREAMINFO can only occur once */
+            if (found_streaminfo) {
+                RETURN_ERROR(AVERROR_INVALIDDATA);
+            }
+            if (metadata_size != FLAC_STREAMINFO_SIZE) {
+                RETURN_ERROR(AVERROR_INVALIDDATA);
+            }
+            found_streaminfo = 1;
+            st->codec->extradata      = buffer;
+            st->codec->extradata_size = metadata_size;
+            buffer = NULL;
+
+            /* get codec params from STREAMINFO header */
+            avpriv_flac_parse_streaminfo(st->codec, &si, st->codec->extradata);
+
+            /* set time base and duration */
+            if (si.samplerate > 0) {
+                avpriv_set_pts_info(st, 64, 1, si.samplerate);
+                if (si.samples > 0)
+                    st->duration = si.samples;
+            }
+        } else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
+            uint8_t isrc[13];
+            uint64_t start;
+            const uint8_t *offset;
+            int i, chapters, track, ti;
+            if (metadata_size < 431)
+                RETURN_ERROR(AVERROR_INVALIDDATA);
+            offset = buffer + 395;
+            chapters = bytestream_get_byte(&offset) - 1;
+            if (chapters <= 0)
+                RETURN_ERROR(AVERROR_INVALIDDATA);
+            for (i = 0; i < chapters; i++) {
+                if (offset + 36 - buffer > metadata_size)
+                    RETURN_ERROR(AVERROR_INVALIDDATA);
+                start = bytestream_get_be64(&offset);
+                track = bytestream_get_byte(&offset);
+                bytestream_get_buffer(&offset, isrc, 12);
+                isrc[12] = 0;
+                offset += 14;
+                ti = bytestream_get_byte(&offset);
+                if (ti <= 0) RETURN_ERROR(AVERROR_INVALIDDATA);
+                offset += ti * 12;
+                avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
+            }
+            av_freep(&buffer);
+        } 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) {
+                RETURN_ERROR(AVERROR_INVALIDDATA);
+            }
+            /* process supported blocks other than STREAMINFO */
+            if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
+                if (ff_vorbis_comment(s, &s->metadata, buffer, metadata_size)) {
+                    av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
+                }
+            }
+            av_freep(&buffer);
+        }
+    }
+
+    return 0;
+
+fail:
+    av_free(buffer);
+    return ret;
+}
+
+static int flac_probe(AVProbeData *p)
+{
+    if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4))
+        return 0;
+    return AVPROBE_SCORE_MAX/2;
+}
+
+AVInputFormat ff_flac_demuxer = {
+    .name           = "flac",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw FLAC"),
+    .read_probe     = flac_probe,
+    .read_header    = flac_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .flags          = AVFMT_GENERIC_INDEX,
+    .extensions     = "flac",
+    .raw_codec_id   = AV_CODEC_ID_FLAC,
+};