* Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
* Mans Rullgard <mans@mansr.com>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * 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.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "libavcodec/bitstream.h"
+#include "libavcodec/get_bits.h"
+#include "libavcodec/put_bits.h"
+#include "libavcodec/avcodec.h"
+#include "libavcodec/mpeg4audio.h"
#include "avformat.h"
+#include "adts.h"
-#define ADTS_HEADER_SIZE 7
+#define ADTS_MAX_FRAME_BYTES ((1 << 13) - 1)
-typedef struct {
- int write_adts;
- int objecttype;
- int sample_rate_index;
- int channel_conf;
-} ADTSContext;
-
-static int decode_extradata(ADTSContext *adts, uint8_t *buf, int size)
+int ff_adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf, int size)
{
GetBitContext gb;
+ PutBitContext pb;
+ MPEG4AudioConfig m4ac;
+ int off;
init_get_bits(&gb, buf, size * 8);
- adts->objecttype = get_bits(&gb, 5) - 1;
- adts->sample_rate_index = get_bits(&gb, 4);
- adts->channel_conf = get_bits(&gb, 4);
+ off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1);
+ if (off < 0)
+ return off;
+ skip_bits_long(&gb, off);
+ adts->objecttype = m4ac.object_type - 1;
+ adts->sample_rate_index = m4ac.sampling_index;
+ adts->channel_conf = m4ac.chan_config;
+
+ if (adts->objecttype > 3U) {
+ av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
+ return -1;
+ }
+ if (adts->sample_rate_index == 15) {
+ av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
+ return -1;
+ }
+ if (get_bits(&gb, 1)) {
+ av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
+ return -1;
+ }
+ if (get_bits(&gb, 1)) {
+ av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
+ return -1;
+ }
+ if (get_bits(&gb, 1)) {
+ av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n");
+ return -1;
+ }
+ if (!adts->channel_conf) {
+ init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
+
+ put_bits(&pb, 3, 5); //ID_PCE
+ adts->pce_size = (avpriv_copy_pce_data(&pb, &gb) + 3) / 8;
+ flush_put_bits(&pb);
+ }
adts->write_adts = 1;
ADTSContext *adts = s->priv_data;
AVCodecContext *avc = s->streams[0]->codec;
- if(avc->extradata_size > 0)
- decode_extradata(adts, avc->extradata, avc->extradata_size);
+ if (avc->extradata_size > 0 &&
+ ff_adts_decode_extradata(s, adts, avc->extradata, avc->extradata_size) < 0)
+ return -1;
return 0;
}
-static int adts_write_frame_header(AVFormatContext *s, int size)
+int ff_adts_write_frame_header(ADTSContext *ctx,
+ uint8_t *buf, int size, int pce_size)
{
- ADTSContext *ctx = s->priv_data;
PutBitContext pb;
- uint8_t buf[ADTS_HEADER_SIZE];
+
+ unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size;
+ if (full_frame_size > ADTS_MAX_FRAME_BYTES) {
+ av_log(NULL, AV_LOG_ERROR, "ADTS frame size too large: %u (max %d)\n",
+ full_frame_size, ADTS_MAX_FRAME_BYTES);
+ return AVERROR_INVALIDDATA;
+ }
init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
/* adts_variable_header */
put_bits(&pb, 1, 0); /* copyright_identification_bit */
put_bits(&pb, 1, 0); /* copyright_identification_start */
- put_bits(&pb, 13, ADTS_HEADER_SIZE + size); /* aac_frame_length */
+ put_bits(&pb, 13, full_frame_size); /* aac_frame_length */
put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
flush_put_bits(&pb);
- put_buffer(s->pb, buf, ADTS_HEADER_SIZE);
return 0;
}
static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
{
ADTSContext *adts = s->priv_data;
- ByteIOContext *pb = s->pb;
+ AVIOContext *pb = s->pb;
+ uint8_t buf[ADTS_HEADER_SIZE];
if (!pkt->size)
return 0;
- if(adts->write_adts)
- adts_write_frame_header(s, pkt->size);
- put_buffer(pb, pkt->data, pkt->size);
- put_flush_packet(pb);
+ if (adts->write_adts) {
+ int err = ff_adts_write_frame_header(adts, buf, pkt->size,
+ adts->pce_size);
+ if (err < 0)
+ return err;
+ avio_write(pb, buf, ADTS_HEADER_SIZE);
+ if (adts->pce_size) {
+ avio_write(pb, adts->pce_data, adts->pce_size);
+ adts->pce_size = 0;
+ }
+ }
+ avio_write(pb, pkt->data, pkt->size);
+ avio_flush(pb);
return 0;
}
-AVOutputFormat adts_muxer = {
- "adts",
- NULL_IF_CONFIG_SMALL("ADTS AAC"),
- "audio/aac",
- "aac",
- sizeof(ADTSContext),
- CODEC_ID_AAC,
- CODEC_ID_NONE,
- adts_write_header,
- adts_write_packet,
+AVOutputFormat ff_adts_muxer = {
+ .name = "adts",
+ .long_name = NULL_IF_CONFIG_SMALL("ADTS AAC"),
+ .mime_type = "audio/aac",
+ .extensions = "aac,adts",
+ .priv_data_size = sizeof(ADTSContext),
+ .audio_codec = CODEC_ID_AAC,
+ .video_codec = CODEC_ID_NONE,
+ .write_header = adts_write_header,
+ .write_packet = adts_write_packet,
};
projects / ffmpeg / blobdiff