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Diffstat (limited to 'ffmpeg1/libavformat/rtpdec_qdm2.c')
-rw-r--r--ffmpeg1/libavformat/rtpdec_qdm2.c319
1 files changed, 0 insertions, 319 deletions
diff --git a/ffmpeg1/libavformat/rtpdec_qdm2.c b/ffmpeg1/libavformat/rtpdec_qdm2.c
deleted file mode 100644
index 6ce776d..0000000
--- a/ffmpeg1/libavformat/rtpdec_qdm2.c
+++ /dev/null
@@ -1,319 +0,0 @@
-/*
- * QDesign Music 2 (QDM2) payload for RTP
- * Copyright (c) 2010 Ronald S. Bultje
- *
- * 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
- */
-
-/**
- * @file
- * @brief RTP support for the QDM2 payload (todo: wiki)
- * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
- */
-
-#include <string.h>
-#include "libavutil/avassert.h"
-#include "libavutil/intreadwrite.h"
-#include "libavcodec/avcodec.h"
-#include "rtp.h"
-#include "rtpdec.h"
-#include "rtpdec_formats.h"
-
-struct PayloadContext {
- /** values read from the config header, used as packet headers */
- //@{
- int block_type; ///< superblock type, value 2 .. 8
- int block_size; ///< from extradata, used as pkt length
- int subpkts_per_block; ///< max. nr. of subpackets to add per output buffer
- //@}
-
- /** Temporary storage for superblock restoring, per packet ID (0x80 total) */
- //@{
- uint16_t len[0x80]; ///< how much the temporary buffer is filled
- uint8_t buf[0x80][0x800]; ///< the temporary storage buffer
-
- unsigned int cache; ///< number of data packets that we have cached right now
- unsigned int n_pkts; ///< number of RTP packets received since last packet output / config
- uint32_t timestamp; ///< timestamp of next-to-be-returned packet
- //@}
-};
-
-/**
- * Parse configuration (basically the codec-specific extradata) from
- * an RTP config subpacket (starts with 0xff).
- *
- * Layout of the config subpacket (in bytes):
- * 1: 0xFF <- config ID
- * then an array {
- * 1: size <- of the current item
- * 1: item type <- 0 .. 4
- * size-2: data <- data depends on the item type
- * }
- *
- * Item 0 implies the end of the config subpacket, and has no data.
- * Item 1 implies a stream configuration without extradata.
- * Item 2 max. nr. of subpackets per superblock
- * Item 3 superblock type for the stream
- * Item 4 implies a stream configuration with extradata (size >= 0x1c).
- *
- * @return <0 on error, otherwise the number of bytes parsed from the
- * input buffer.
- */
-static int qdm2_parse_config(PayloadContext *qdm, AVStream *st,
- const uint8_t *buf, const uint8_t *end)
-{
- const uint8_t *p = buf;
-
- while (end - p >= 2) {
- unsigned int item_len = p[0], config_item = p[1];
-
- if (item_len < 2 || end - p < item_len || config_item > 4)
- return AVERROR_INVALIDDATA;
-
- switch (config_item) {
- case 0: /* end of config block */
- return p - buf + item_len;
- case 1: /* stream without extradata */
- /* FIXME: set default qdm->block_size */
- break;
- case 2: /**< subpackets per block */
- if (item_len < 3)
- return AVERROR_INVALIDDATA;
- qdm->subpkts_per_block = p[2];
- break;
- case 3: /* superblock type */
- if (item_len < 4)
- return AVERROR_INVALIDDATA;
- qdm->block_type = AV_RB16(p + 2);
- break;
- case 4: /* stream with extradata */
- if (item_len < 30)
- return AVERROR_INVALIDDATA;
- av_freep(&st->codec->extradata);
- st->codec->extradata_size = 26 + item_len;
- if (!(st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE))) {
- st->codec->extradata_size = 0;
- return AVERROR(ENOMEM);
- }
- AV_WB32(st->codec->extradata, 12);
- memcpy(st->codec->extradata + 4, "frma", 4);
- memcpy(st->codec->extradata + 8, "QDM2", 4);
- AV_WB32(st->codec->extradata + 12, 6 + item_len);
- memcpy(st->codec->extradata + 16, "QDCA", 4);
- memcpy(st->codec->extradata + 20, p + 2, item_len - 2);
- AV_WB32(st->codec->extradata + 18 + item_len, 8);
- AV_WB32(st->codec->extradata + 22 + item_len, 0);
-
- qdm->block_size = AV_RB32(p + 26);
- break;
- }
-
- p += item_len;
- }
-
- return AVERROR(EAGAIN); /* not enough data */
-}
-
-/**
- * Parse a single subpacket. We store this subpacket in an intermediate
- * buffer (position depends on the ID (byte[0]). When called, at least
- * 4 bytes are available for reading (see qdm2_parse_packet()).
- *
- * Layout of a single subpacket (RTP packets commonly contain multiple
- * such subpackets) - length in bytes:
- * 1: ordering ID <- 0 .. 0x7F
- * 1: subpacket type <- 0 .. 0x7F; value & 0x80 means subpacket length = 2 bytes, else 1 byte
- * 1/2: subpacket length <- length of the data following the flags/length fields
- * if (subpacket type & 0x7F) == 0x7F
- * 1: subpacket type, higher bits
- * size: subpacket data
- *
- * The subpackets come in randomly, and should be encapsulated into 1
- * or more superblocks (containing qdm->subpkts_per_block subpackets
- * each) per RTP packet, in order of ascending "ordering ID", see
- * qdm2_restore_block().
- *
- * @return <0 on error, otherwise the number of bytes parsed from the
- * input buffer.
- */
-static int qdm2_parse_subpacket(PayloadContext *qdm, AVStream *st,
- const uint8_t *buf, const uint8_t *end)
-{
- const uint8_t *p = buf;
- unsigned int id, len, type, to_copy;
-
- /* parse header so we know the size of the header/data */
- id = *p++;
- type = *p++;
- if (type & 0x80) {
- len = AV_RB16(p);
- p += 2;
- type &= 0x7F;
- } else
- len = *p++;
-
- if (end - p < len + (type == 0x7F) || id >= 0x80)
- return AVERROR_INVALIDDATA;
- if (type == 0x7F)
- type |= *p++ << 8;
-
- /* copy data into a temporary buffer */
- to_copy = FFMIN(len + (p - &buf[1]), 0x800 - qdm->len[id]);
- memcpy(&qdm->buf[id][qdm->len[id]], buf + 1, to_copy);
- qdm->len[id] += to_copy;
-
- return p + len - buf;
-}
-
-/**
- * Add a superblock header around a set of subpackets.
- *
- * @return <0 on error, else 0.
- */
-static int qdm2_restore_block(PayloadContext *qdm, AVStream *st, AVPacket *pkt)
-{
- int to_copy, n, res, include_csum;
- uint8_t *p, *csum_pos = NULL;
-
- /* create packet to hold subpkts into a superblock */
- assert(qdm->cache > 0);
- for (n = 0; n < 0x80; n++)
- if (qdm->len[n] > 0)
- break;
- av_assert0(n < 0x80);
-
- if ((res = av_new_packet(pkt, qdm->block_size)) < 0)
- return res;
- memset(pkt->data, 0, pkt->size);
- pkt->stream_index = st->index;
- p = pkt->data;
-
- /* superblock header */
- if (qdm->len[n] > 0xff) {
- *p++ = qdm->block_type | 0x80;
- AV_WB16(p, qdm->len[n]);
- p += 2;
- } else {
- *p++ = qdm->block_type;
- *p++ = qdm->len[n];
- }
- if ((include_csum = (qdm->block_type == 2 || qdm->block_type == 4))) {
- csum_pos = p;
- p += 2;
- }
-
- /* subpacket data */
- to_copy = FFMIN(qdm->len[n], pkt->size - (p - pkt->data));
- memcpy(p, qdm->buf[n], to_copy);
- qdm->len[n] = 0;
-
- /* checksum header */
- if (include_csum) {
- unsigned int total = 0;
- uint8_t *q;
-
- for (q = pkt->data; q < &pkt->data[qdm->block_size]; q++)
- total += *q;
- AV_WB16(csum_pos, (uint16_t) total);
- }
-
- return 0;
-}
-
-/** return 0 on packet, no more left, 1 on packet, -1 on partial packet... */
-static int qdm2_parse_packet(AVFormatContext *s, PayloadContext *qdm,
- AVStream *st, AVPacket *pkt,
- uint32_t *timestamp,
- const uint8_t *buf, int len, uint16_t seq,
- int flags)
-{
- int res = AVERROR_INVALIDDATA, n;
- const uint8_t *end = buf + len, *p = buf;
-
- if (len > 0) {
- if (len < 2)
- return AVERROR_INVALIDDATA;
-
- /* configuration block */
- if (*p == 0xff) {
- if (qdm->n_pkts > 0) {
- av_log(s, AV_LOG_WARNING,
- "Out of sequence config - dropping queue\n");
- qdm->n_pkts = 0;
- memset(qdm->len, 0, sizeof(qdm->len));
- }
-
- if ((res = qdm2_parse_config(qdm, st, ++p, end)) < 0)
- return res;
- p += res;
-
- /* We set codec_id to AV_CODEC_ID_NONE initially to
- * delay decoder initialization since extradata is
- * carried within the RTP stream, not SDP. Here,
- * by setting codec_id to AV_CODEC_ID_QDM2, we are signalling
- * to the decoder that it is OK to initialize. */
- st->codec->codec_id = AV_CODEC_ID_QDM2;
- }
- if (st->codec->codec_id == AV_CODEC_ID_NONE)
- return AVERROR(EAGAIN);
-
- /* subpackets */
- while (end - p >= 4) {
- if ((res = qdm2_parse_subpacket(qdm, st, p, end)) < 0)
- return res;
- p += res;
- }
-
- qdm->timestamp = *timestamp;
- if (++qdm->n_pkts < qdm->subpkts_per_block)
- return AVERROR(EAGAIN);
- qdm->cache = 0;
- for (n = 0; n < 0x80; n++)
- if (qdm->len[n] > 0)
- qdm->cache++;
- }
-
- /* output the subpackets into freshly created superblock structures */
- if (!qdm->cache || (res = qdm2_restore_block(qdm, st, pkt)) < 0)
- return res;
- if (--qdm->cache == 0)
- qdm->n_pkts = 0;
-
- *timestamp = qdm->timestamp;
- qdm->timestamp = RTP_NOTS_VALUE;
-
- return (qdm->cache > 0) ? 1 : 0;
-}
-
-static PayloadContext *qdm2_extradata_new(void)
-{
- return av_mallocz(sizeof(PayloadContext));
-}
-
-static void qdm2_extradata_free(PayloadContext *qdm)
-{
- av_free(qdm);
-}
-
-RTPDynamicProtocolHandler ff_qdm2_dynamic_handler = {
- .enc_name = "X-QDM",
- .codec_type = AVMEDIA_TYPE_AUDIO,
- .codec_id = AV_CODEC_ID_NONE,
- .alloc = qdm2_extradata_new,
- .free = qdm2_extradata_free,
- .parse_packet = qdm2_parse_packet,
-};
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