Rename ffmpeg-4.2-fit to ffmpeg-4-fit

trunk/3rdparty/ffmpeg-4-fit/libavcodec/aac_adtstoasc_bsf.c

@@ -0,0 +1,158 @@
+/*
+ * MPEG-2/4 AAC ADTS to MPEG-4 Audio Specific Configuration bitstream filter
+ * Copyright (c) 2009 Alex Converse <alex.converse@gmail.com>
+ *
+ * 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 "adts_header.h"
+#include "adts_parser.h"
+#include "avcodec.h"
+#include "bsf.h"
+#include "put_bits.h"
+#include "get_bits.h"
+#include "mpeg4audio.h"
+#include "internal.h"
+
+typedef struct AACBSFContext {
+    int first_frame_done;
+} AACBSFContext;
+
+/**
+ * This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
+ * ADTS header and removes the ADTS header.
+ */
+static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *pkt)
+{
+    AACBSFContext *ctx = bsfc->priv_data;
+
+    GetBitContext gb;
+    PutBitContext pb;
+    AACADTSHeaderInfo hdr;
+    int ret;
+
+    ret = ff_bsf_get_packet_ref(bsfc, pkt);
+    if (ret < 0)
+        return ret;
+
+    if (bsfc->par_in->extradata && pkt->size >= 2 && (AV_RB16(pkt->data) >> 4) != 0xfff)
+        return 0;
+
+    if (pkt->size < AV_AAC_ADTS_HEADER_SIZE)
+        goto packet_too_small;
+
+    init_get_bits(&gb, pkt->data, AV_AAC_ADTS_HEADER_SIZE * 8);
+
+    if (ff_adts_header_parse(&gb, &hdr) < 0) {
+        av_log(bsfc, AV_LOG_ERROR, "Error parsing ADTS frame header!\n");
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
+    if (!hdr.crc_absent && hdr.num_aac_frames > 1) {
+        avpriv_report_missing_feature(bsfc,
+                                      "Multiple RDBs per frame with CRC");
+        ret = AVERROR_PATCHWELCOME;
+        goto fail;
+    }
+
+    pkt->size -= AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
+    if (pkt->size <= 0)
+        goto packet_too_small;
+    pkt->data += AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
+
+    if (!ctx->first_frame_done) {
+        int            pce_size = 0;
+        uint8_t        pce_data[MAX_PCE_SIZE];
+        uint8_t       *extradata;
+
+        if (!hdr.chan_config) {
+            init_get_bits(&gb, pkt->data, pkt->size * 8);
+            if (get_bits(&gb, 3) != 5) {
+                avpriv_report_missing_feature(bsfc,
+                                              "PCE-based channel configuration "
+                                              "without PCE as first syntax "
+                                              "element");
+                ret = AVERROR_PATCHWELCOME;
+                goto fail;
+            }
+            init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
+            pce_size = ff_copy_pce_data(&pb, &gb) / 8;
+            flush_put_bits(&pb);
+            pkt->size -= get_bits_count(&gb)/8;
+            pkt->data += get_bits_count(&gb)/8;
+        }
+
+        extradata = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
+                                            2 + pce_size);
+        if (!extradata) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        init_put_bits(&pb, extradata, 2 + pce_size);
+        put_bits(&pb, 5, hdr.object_type);
+        put_bits(&pb, 4, hdr.sampling_index);
+        put_bits(&pb, 4, hdr.chan_config);
+        put_bits(&pb, 1, 0); //frame length - 1024 samples
+        put_bits(&pb, 1, 0); //does not depend on core coder
+        put_bits(&pb, 1, 0); //is not extension
+        flush_put_bits(&pb);
+        if (pce_size) {
+            memcpy(extradata + 2, pce_data, pce_size);
+        }
+
+        ctx->first_frame_done = 1;
+    }
+
+    return 0;
+
+packet_too_small:
+    av_log(bsfc, AV_LOG_ERROR, "Input packet too small\n");
+    ret = AVERROR_INVALIDDATA;
+fail:
+    av_packet_unref(pkt);
+    return ret;
+}
+
+static int aac_adtstoasc_init(AVBSFContext *ctx)
+{
+    /* Validate the extradata if the stream is already MPEG-4 AudioSpecificConfig */
+    if (ctx->par_in->extradata) {
+        MPEG4AudioConfig mp4ac;
+        int ret = avpriv_mpeg4audio_get_config(&mp4ac, ctx->par_in->extradata,
+                                               ctx->par_in->extradata_size * 8, 1);
+        if (ret < 0) {
+            av_log(ctx, AV_LOG_ERROR, "Error parsing AudioSpecificConfig extradata!\n");
+            return ret;
+        }
+    }
+
+    return 0;
+}
+
+static const enum AVCodecID codec_ids[] = {
+    AV_CODEC_ID_AAC, AV_CODEC_ID_NONE,
+};
+
+const AVBitStreamFilter ff_aac_adtstoasc_bsf = {
+    .name           = "aac_adtstoasc",
+    .priv_data_size = sizeof(AACBSFContext),
+    .init           = aac_adtstoasc_init,
+    .filter         = aac_adtstoasc_filter,
+    .codec_ids      = codec_ids,
+};