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Diffstat (limited to 'ffmpeg/libavformat/rtpdec_vp8.c')
-rw-r--r--ffmpeg/libavformat/rtpdec_vp8.c298
1 files changed, 0 insertions, 298 deletions
diff --git a/ffmpeg/libavformat/rtpdec_vp8.c b/ffmpeg/libavformat/rtpdec_vp8.c
deleted file mode 100644
index b4b4f22..0000000
--- a/ffmpeg/libavformat/rtpdec_vp8.c
+++ /dev/null
@@ -1,298 +0,0 @@
-/*
- * RTP VP8 Depacketizer
- * Copyright (c) 2010 Josh Allmann
- * Copyright (c) 2012 Martin Storsjo
- *
- * 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 VP8 payload
- * @author Josh Allmann <joshua.allmann@gmail.com>
- * @see http://tools.ietf.org/html/draft-ietf-payload-vp8-05
- */
-
-#include "libavcodec/bytestream.h"
-
-#include "rtpdec_formats.h"
-
-struct PayloadContext {
- AVIOContext *data;
- uint32_t timestamp;
- int is_keyframe;
- /* If sequence_ok is set, we keep returning data (even if we might have
- * lost some data, but we haven't lost any too critical data that would
- * cause the decoder to desynchronize and output random garbage).
- */
- int sequence_ok;
- int first_part_size;
- uint16_t prev_seq;
- int prev_pictureid;
- int broken_frame;
- /* If sequence_dirty is set, we have lost some data (critical or
- * non-critical) and decoding will have some sort of artefacts, and
- * we thus should request a new keyframe.
- */
- int sequence_dirty;
- int got_keyframe;
-};
-
-static void vp8_free_buffer(PayloadContext *vp8)
-{
- uint8_t *tmp;
- if (!vp8->data)
- return;
- avio_close_dyn_buf(vp8->data, &tmp);
- av_free(tmp);
- vp8->data = NULL;
-}
-
-static int vp8_broken_sequence(AVFormatContext *ctx, PayloadContext *vp8,
- const char *msg)
-{
- vp8->sequence_ok = 0;
- av_log(ctx, AV_LOG_WARNING, "%s", msg);
- vp8_free_buffer(vp8);
- return AVERROR(EAGAIN);
-}
-
-static int vp8_handle_packet(AVFormatContext *ctx, PayloadContext *vp8,
- AVStream *st, AVPacket *pkt, uint32_t *timestamp,
- const uint8_t *buf, int len, uint16_t seq,
- int flags)
-{
- int start_partition, end_packet;
- int extended_bits, part_id;
- int pictureid_present = 0, tl0picidx_present = 0, tid_present = 0,
- keyidx_present = 0;
- int pictureid = -1, pictureid_mask = 0;
- int returned_old_frame = 0;
- uint32_t old_timestamp = 0;
-
- if (!buf) {
- if (vp8->data) {
- int ret = ff_rtp_finalize_packet(pkt, &vp8->data, st->index);
- if (ret < 0)
- return ret;
- *timestamp = vp8->timestamp;
- if (vp8->sequence_dirty)
- pkt->flags |= AV_PKT_FLAG_CORRUPT;
- return 0;
- }
- return AVERROR(EAGAIN);
- }
-
- if (len < 1)
- return AVERROR_INVALIDDATA;
-
- extended_bits = buf[0] & 0x80;
- start_partition = buf[0] & 0x10;
- part_id = buf[0] & 0x0f;
- end_packet = flags & RTP_FLAG_MARKER;
- buf++;
- len--;
- if (extended_bits) {
- if (len < 1)
- return AVERROR_INVALIDDATA;
- pictureid_present = buf[0] & 0x80;
- tl0picidx_present = buf[0] & 0x40;
- tid_present = buf[0] & 0x20;
- keyidx_present = buf[0] & 0x10;
- buf++;
- len--;
- }
- if (pictureid_present) {
- if (len < 1)
- return AVERROR_INVALIDDATA;
- if (buf[0] & 0x80) {
- if (len < 2)
- return AVERROR_INVALIDDATA;
- pictureid = AV_RB16(buf) & 0x7fff;
- pictureid_mask = 0x7fff;
- buf += 2;
- len -= 2;
- } else {
- pictureid = buf[0] & 0x7f;
- pictureid_mask = 0x7f;
- buf++;
- len--;
- }
- }
- if (tl0picidx_present) {
- // Ignoring temporal level zero index
- buf++;
- len--;
- }
- if (tid_present || keyidx_present) {
- // Ignoring temporal layer index, layer sync bit and keyframe index
- buf++;
- len--;
- }
- if (len < 1)
- return AVERROR_INVALIDDATA;
-
- if (start_partition && part_id == 0 && len >= 3) {
- int res;
- int non_key = buf[0] & 0x01;
- if (!non_key) {
- vp8_free_buffer(vp8);
- // Keyframe, decoding ok again
- vp8->sequence_ok = 1;
- vp8->sequence_dirty = 0;
- vp8->got_keyframe = 1;
- } else {
- int can_continue = vp8->data && !vp8->is_keyframe &&
- avio_tell(vp8->data) >= vp8->first_part_size;
- if (!vp8->sequence_ok)
- return AVERROR(EAGAIN);
- if (!vp8->got_keyframe)
- return vp8_broken_sequence(ctx, vp8, "Keyframe missing\n");
- if (pictureid >= 0) {
- if (pictureid != ((vp8->prev_pictureid + 1) & pictureid_mask)) {
- return vp8_broken_sequence(ctx, vp8,
- "Missed a picture, sequence broken\n");
- } else {
- if (vp8->data && !can_continue)
- return vp8_broken_sequence(ctx, vp8,
- "Missed a picture, sequence broken\n");
- }
- } else {
- uint16_t expected_seq = vp8->prev_seq + 1;
- int16_t diff = seq - expected_seq;
- if (vp8->data) {
- // No picture id, so we can't know if missed packets
- // contained any new frames. If diff == 0, we did get
- // later packets from the same frame (matching timestamp),
- // so we know we didn't miss any frame. If diff == 1 and
- // we still have data (not flushed by the end of frame
- // marker), the single missed packet must have been part
- // of the same frame.
- if ((diff == 0 || diff == 1) && can_continue) {
- // Proceed with what we have
- } else {
- return vp8_broken_sequence(ctx, vp8,
- "Missed too much, sequence broken\n");
- }
- } else {
- if (diff != 0)
- return vp8_broken_sequence(ctx, vp8,
- "Missed unknown data, sequence broken\n");
- }
- }
- if (vp8->data) {
- vp8->sequence_dirty = 1;
- if (avio_tell(vp8->data) >= vp8->first_part_size) {
- int ret = ff_rtp_finalize_packet(pkt, &vp8->data, st->index);
- if (ret < 0)
- return ret;
- pkt->flags |= AV_PKT_FLAG_CORRUPT;
- returned_old_frame = 1;
- old_timestamp = vp8->timestamp;
- } else {
- // Shouldn't happen
- vp8_free_buffer(vp8);
- }
- }
- }
- vp8->first_part_size = (AV_RL16(&buf[1]) << 3 | buf[0] >> 5) + 3;
- if ((res = avio_open_dyn_buf(&vp8->data)) < 0)
- return res;
- vp8->timestamp = *timestamp;
- vp8->broken_frame = 0;
- vp8->prev_pictureid = pictureid;
- vp8->is_keyframe = !non_key;
- } else {
- uint16_t expected_seq = vp8->prev_seq + 1;
-
- if (!vp8->sequence_ok)
- return AVERROR(EAGAIN);
-
- if (vp8->timestamp != *timestamp) {
- // Missed the start of the new frame, sequence broken
- return vp8_broken_sequence(ctx, vp8,
- "Received no start marker; dropping frame\n");
- }
-
- if (seq != expected_seq) {
- if (vp8->is_keyframe) {
- return vp8_broken_sequence(ctx, vp8,
- "Missed part of a keyframe, sequence broken\n");
- } else if (vp8->data && avio_tell(vp8->data) >= vp8->first_part_size) {
- vp8->broken_frame = 1;
- vp8->sequence_dirty = 1;
- } else {
- return vp8_broken_sequence(ctx, vp8,
- "Missed part of the first partition, sequence broken\n");
- }
- }
- }
-
- if (!vp8->data)
- return vp8_broken_sequence(ctx, vp8, "Received no start marker\n");
-
- vp8->prev_seq = seq;
- if (!vp8->broken_frame)
- avio_write(vp8->data, buf, len);
-
- if (returned_old_frame) {
- *timestamp = old_timestamp;
- return end_packet ? 1 : 0;
- }
-
- if (end_packet) {
- int ret;
- ret = ff_rtp_finalize_packet(pkt, &vp8->data, st->index);
- if (ret < 0)
- return ret;
- if (vp8->sequence_dirty)
- pkt->flags |= AV_PKT_FLAG_CORRUPT;
- return 0;
- }
-
- return AVERROR(EAGAIN);
-}
-
-static PayloadContext *vp8_new_context(void)
-{
- PayloadContext *vp8 = av_mallocz(sizeof(PayloadContext));
- if (!vp8)
- return NULL;
- vp8->sequence_ok = 1;
- return vp8;
-}
-
-static void vp8_free_context(PayloadContext *vp8)
-{
- vp8_free_buffer(vp8);
- av_free(vp8);
-}
-
-static int vp8_need_keyframe(PayloadContext *vp8)
-{
- return vp8->sequence_dirty || !vp8->sequence_ok;
-}
-
-RTPDynamicProtocolHandler ff_vp8_dynamic_handler = {
- .enc_name = "VP8",
- .codec_type = AVMEDIA_TYPE_VIDEO,
- .codec_id = AV_CODEC_ID_VP8,
- .alloc = vp8_new_context,
- .free = vp8_free_context,
- .parse_packet = vp8_handle_packet,
- .need_keyframe = vp8_need_keyframe,
-};
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