| /* |
| * RTMP input format |
| * Copyright (c) 2009 Kostya Shishkov |
| * |
| * 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/bytestream.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/intfloat_readwrite.h" |
| #include "avformat.h" |
| |
| #include "rtmppkt.h" |
| #include "flv.h" |
| #include "url.h" |
| |
| void ff_amf_write_bool(uint8_t **dst, int val) |
| { |
| bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL); |
| bytestream_put_byte(dst, val); |
| } |
| |
| void ff_amf_write_number(uint8_t **dst, double val) |
| { |
| bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER); |
| bytestream_put_be64(dst, av_dbl2int(val)); |
| } |
| |
| void ff_amf_write_string(uint8_t **dst, const char *str) |
| { |
| bytestream_put_byte(dst, AMF_DATA_TYPE_STRING); |
| bytestream_put_be16(dst, strlen(str)); |
| bytestream_put_buffer(dst, str, strlen(str)); |
| } |
| |
| void ff_amf_write_null(uint8_t **dst) |
| { |
| bytestream_put_byte(dst, AMF_DATA_TYPE_NULL); |
| } |
| |
| void ff_amf_write_object_start(uint8_t **dst) |
| { |
| bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT); |
| } |
| |
| void ff_amf_write_field_name(uint8_t **dst, const char *str) |
| { |
| bytestream_put_be16(dst, strlen(str)); |
| bytestream_put_buffer(dst, str, strlen(str)); |
| } |
| |
| void ff_amf_write_object_end(uint8_t **dst) |
| { |
| /* first two bytes are field name length = 0, |
| * AMF object should end with it and end marker |
| */ |
| bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END); |
| } |
| |
| int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p, |
| int chunk_size, RTMPPacket *prev_pkt) |
| { |
| uint8_t hdr, t, buf[16]; |
| int channel_id, timestamp, data_size, offset = 0; |
| uint32_t extra = 0; |
| enum RTMPPacketType type; |
| int size = 0; |
| |
| if (ffurl_read(h, &hdr, 1) != 1) |
| return AVERROR(EIO); |
| size++; |
| channel_id = hdr & 0x3F; |
| |
| if (channel_id < 2) { //special case for channel number >= 64 |
| buf[1] = 0; |
| if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1) |
| return AVERROR(EIO); |
| size += channel_id + 1; |
| channel_id = AV_RL16(buf) + 64; |
| } |
| data_size = prev_pkt[channel_id].data_size; |
| type = prev_pkt[channel_id].type; |
| extra = prev_pkt[channel_id].extra; |
| |
| hdr >>= 6; |
| if (hdr == RTMP_PS_ONEBYTE) { |
| timestamp = prev_pkt[channel_id].ts_delta; |
| } else { |
| if (ffurl_read_complete(h, buf, 3) != 3) |
| return AVERROR(EIO); |
| size += 3; |
| timestamp = AV_RB24(buf); |
| if (hdr != RTMP_PS_FOURBYTES) { |
| if (ffurl_read_complete(h, buf, 3) != 3) |
| return AVERROR(EIO); |
| size += 3; |
| data_size = AV_RB24(buf); |
| if (ffurl_read_complete(h, buf, 1) != 1) |
| return AVERROR(EIO); |
| size++; |
| type = buf[0]; |
| if (hdr == RTMP_PS_TWELVEBYTES) { |
| if (ffurl_read_complete(h, buf, 4) != 4) |
| return AVERROR(EIO); |
| size += 4; |
| extra = AV_RL32(buf); |
| } |
| } |
| if (timestamp == 0xFFFFFF) { |
| if (ffurl_read_complete(h, buf, 4) != 4) |
| return AVERROR(EIO); |
| timestamp = AV_RB32(buf); |
| } |
| } |
| if (hdr != RTMP_PS_TWELVEBYTES) |
| timestamp += prev_pkt[channel_id].timestamp; |
| |
| if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size)) |
| return -1; |
| p->extra = extra; |
| // save history |
| prev_pkt[channel_id].channel_id = channel_id; |
| prev_pkt[channel_id].type = type; |
| prev_pkt[channel_id].data_size = data_size; |
| prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp; |
| prev_pkt[channel_id].timestamp = timestamp; |
| prev_pkt[channel_id].extra = extra; |
| while (data_size > 0) { |
| int toread = FFMIN(data_size, chunk_size); |
| if (ffurl_read_complete(h, p->data + offset, toread) != toread) { |
| ff_rtmp_packet_destroy(p); |
| return AVERROR(EIO); |
| } |
| data_size -= chunk_size; |
| offset += chunk_size; |
| size += chunk_size; |
| if (data_size > 0) { |
| ffurl_read_complete(h, &t, 1); //marker |
| size++; |
| if (t != (0xC0 + channel_id)) |
| return -1; |
| } |
| } |
| return size; |
| } |
| |
| int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt, |
| int chunk_size, RTMPPacket *prev_pkt) |
| { |
| uint8_t pkt_hdr[16], *p = pkt_hdr; |
| int mode = RTMP_PS_TWELVEBYTES; |
| int off = 0; |
| int size = 0; |
| |
| pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp; |
| |
| //if channel_id = 0, this is first presentation of prev_pkt, send full hdr. |
| if (prev_pkt[pkt->channel_id].channel_id && |
| pkt->extra == prev_pkt[pkt->channel_id].extra) { |
| if (pkt->type == prev_pkt[pkt->channel_id].type && |
| pkt->data_size == prev_pkt[pkt->channel_id].data_size) { |
| mode = RTMP_PS_FOURBYTES; |
| if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta) |
| mode = RTMP_PS_ONEBYTE; |
| } else { |
| mode = RTMP_PS_EIGHTBYTES; |
| } |
| } |
| |
| if (pkt->channel_id < 64) { |
| bytestream_put_byte(&p, pkt->channel_id | (mode << 6)); |
| } else if (pkt->channel_id < 64 + 256) { |
| bytestream_put_byte(&p, 0 | (mode << 6)); |
| bytestream_put_byte(&p, pkt->channel_id - 64); |
| } else { |
| bytestream_put_byte(&p, 1 | (mode << 6)); |
| bytestream_put_le16(&p, pkt->channel_id - 64); |
| } |
| if (mode != RTMP_PS_ONEBYTE) { |
| uint32_t timestamp = pkt->timestamp; |
| if (mode != RTMP_PS_TWELVEBYTES) |
| timestamp = pkt->ts_delta; |
| bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp); |
| if (mode != RTMP_PS_FOURBYTES) { |
| bytestream_put_be24(&p, pkt->data_size); |
| bytestream_put_byte(&p, pkt->type); |
| if (mode == RTMP_PS_TWELVEBYTES) |
| bytestream_put_le32(&p, pkt->extra); |
| } |
| if (timestamp >= 0xFFFFFF) |
| bytestream_put_be32(&p, timestamp); |
| } |
| // save history |
| prev_pkt[pkt->channel_id].channel_id = pkt->channel_id; |
| prev_pkt[pkt->channel_id].type = pkt->type; |
| prev_pkt[pkt->channel_id].data_size = pkt->data_size; |
| prev_pkt[pkt->channel_id].timestamp = pkt->timestamp; |
| if (mode != RTMP_PS_TWELVEBYTES) { |
| prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta; |
| } else { |
| prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp; |
| } |
| prev_pkt[pkt->channel_id].extra = pkt->extra; |
| |
| ffurl_write(h, pkt_hdr, p-pkt_hdr); |
| size = p - pkt_hdr + pkt->data_size; |
| while (off < pkt->data_size) { |
| int towrite = FFMIN(chunk_size, pkt->data_size - off); |
| ffurl_write(h, pkt->data + off, towrite); |
| off += towrite; |
| if (off < pkt->data_size) { |
| uint8_t marker = 0xC0 | pkt->channel_id; |
| ffurl_write(h, &marker, 1); |
| size++; |
| } |
| } |
| return size; |
| } |
| |
| int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type, |
| int timestamp, int size) |
| { |
| if (size) { |
| pkt->data = av_malloc(size); |
| if (!pkt->data) |
| return AVERROR(ENOMEM); |
| } |
| pkt->data_size = size; |
| pkt->channel_id = channel_id; |
| pkt->type = type; |
| pkt->timestamp = timestamp; |
| pkt->extra = 0; |
| pkt->ts_delta = 0; |
| |
| return 0; |
| } |
| |
| void ff_rtmp_packet_destroy(RTMPPacket *pkt) |
| { |
| if (!pkt) |
| return; |
| av_freep(&pkt->data); |
| pkt->data_size = 0; |
| } |
| |
| int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end) |
| { |
| const uint8_t *base = data; |
| |
| if (data >= data_end) |
| return -1; |
| switch (*data++) { |
| case AMF_DATA_TYPE_NUMBER: return 9; |
| case AMF_DATA_TYPE_BOOL: return 2; |
| case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data); |
| case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data); |
| case AMF_DATA_TYPE_NULL: return 1; |
| case AMF_DATA_TYPE_ARRAY: |
| data += 4; |
| case AMF_DATA_TYPE_OBJECT: |
| for (;;) { |
| int size = bytestream_get_be16(&data); |
| int t; |
| if (!size) { |
| data++; |
| break; |
| } |
| if (data + size >= data_end || data + size < data) |
| return -1; |
| data += size; |
| t = ff_amf_tag_size(data, data_end); |
| if (t < 0 || data + t >= data_end) |
| return -1; |
| data += t; |
| } |
| return data - base; |
| case AMF_DATA_TYPE_OBJECT_END: return 1; |
| default: return -1; |
| } |
| } |
| |
| int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end, |
| const uint8_t *name, uint8_t *dst, int dst_size) |
| { |
| int namelen = strlen(name); |
| int len; |
| |
| while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) { |
| len = ff_amf_tag_size(data, data_end); |
| if (len < 0) |
| len = data_end - data; |
| data += len; |
| } |
| if (data_end - data < 3) |
| return -1; |
| data++; |
| for (;;) { |
| int size = bytestream_get_be16(&data); |
| if (!size) |
| break; |
| if (data + size >= data_end || data + size < data) |
| return -1; |
| data += size; |
| if (size == namelen && !memcmp(data-size, name, namelen)) { |
| switch (*data++) { |
| case AMF_DATA_TYPE_NUMBER: |
| snprintf(dst, dst_size, "%g", av_int2dbl(AV_RB64(data))); |
| break; |
| case AMF_DATA_TYPE_BOOL: |
| snprintf(dst, dst_size, "%s", *data ? "true" : "false"); |
| break; |
| case AMF_DATA_TYPE_STRING: |
| len = bytestream_get_be16(&data); |
| av_strlcpy(dst, data, FFMIN(len+1, dst_size)); |
| break; |
| default: |
| return -1; |
| } |
| return 0; |
| } |
| len = ff_amf_tag_size(data, data_end); |
| if (len < 0 || data + len >= data_end || data + len < data) |
| return -1; |
| data += len; |
| } |
| return -1; |
| } |
| |
| static const char* rtmp_packet_type(int type) |
| { |
| switch (type) { |
| case RTMP_PT_CHUNK_SIZE: return "chunk size"; |
| case RTMP_PT_BYTES_READ: return "bytes read"; |
| case RTMP_PT_PING: return "ping"; |
| case RTMP_PT_SERVER_BW: return "server bandwidth"; |
| case RTMP_PT_CLIENT_BW: return "client bandwidth"; |
| case RTMP_PT_AUDIO: return "audio packet"; |
| case RTMP_PT_VIDEO: return "video packet"; |
| case RTMP_PT_FLEX_STREAM: return "Flex shared stream"; |
| case RTMP_PT_FLEX_OBJECT: return "Flex shared object"; |
| case RTMP_PT_FLEX_MESSAGE: return "Flex shared message"; |
| case RTMP_PT_NOTIFY: return "notification"; |
| case RTMP_PT_SHARED_OBJ: return "shared object"; |
| case RTMP_PT_INVOKE: return "invoke"; |
| case RTMP_PT_METADATA: return "metadata"; |
| default: return "unknown"; |
| } |
| } |
| |
| static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end) |
| { |
| int size; |
| char buf[1024]; |
| |
| if (data >= data_end) |
| return; |
| switch (*data++) { |
| case AMF_DATA_TYPE_NUMBER: |
| av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2dbl(AV_RB64(data))); |
| return; |
| case AMF_DATA_TYPE_BOOL: |
| av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data); |
| return; |
| case AMF_DATA_TYPE_STRING: |
| case AMF_DATA_TYPE_LONG_STRING: |
| if (data[-1] == AMF_DATA_TYPE_STRING) { |
| size = bytestream_get_be16(&data); |
| } else { |
| size = bytestream_get_be32(&data); |
| } |
| size = FFMIN(size, 1023); |
| memcpy(buf, data, size); |
| buf[size] = 0; |
| av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf); |
| return; |
| case AMF_DATA_TYPE_NULL: |
| av_log(ctx, AV_LOG_DEBUG, " NULL\n"); |
| return; |
| case AMF_DATA_TYPE_ARRAY: |
| data += 4; |
| case AMF_DATA_TYPE_OBJECT: |
| av_log(ctx, AV_LOG_DEBUG, " {\n"); |
| for (;;) { |
| int size = bytestream_get_be16(&data); |
| int t; |
| memcpy(buf, data, size); |
| buf[size] = 0; |
| if (!size) { |
| av_log(ctx, AV_LOG_DEBUG, " }\n"); |
| data++; |
| break; |
| } |
| if (data + size >= data_end || data + size < data) |
| return; |
| data += size; |
| av_log(ctx, AV_LOG_DEBUG, " %s: ", buf); |
| ff_amf_tag_contents(ctx, data, data_end); |
| t = ff_amf_tag_size(data, data_end); |
| if (t < 0 || data + t >= data_end) |
| return; |
| data += t; |
| } |
| return; |
| case AMF_DATA_TYPE_OBJECT_END: |
| av_log(ctx, AV_LOG_DEBUG, " }\n"); |
| return; |
| default: |
| return; |
| } |
| } |
| |
| void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p) |
| { |
| av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n", |
| rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size); |
| if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) { |
| uint8_t *src = p->data, *src_end = p->data + p->data_size; |
| while (src < src_end) { |
| int sz; |
| ff_amf_tag_contents(ctx, src, src_end); |
| sz = ff_amf_tag_size(src, src_end); |
| if (sz < 0) |
| break; |
| src += sz; |
| } |
| } else if (p->type == RTMP_PT_SERVER_BW){ |
| av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data)); |
| } else if (p->type == RTMP_PT_CLIENT_BW){ |
| av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data)); |
| } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) { |
| int i; |
| for (i = 0; i < p->data_size; i++) |
| av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]); |
| av_log(ctx, AV_LOG_DEBUG, "\n"); |
| } |
| } |