| /* |
| * FFM (ffserver live feed) demuxer |
| * Copyright (c) 2001 Fabrice Bellard |
| * |
| * 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 <stdint.h> |
| |
| #include "libavutil/internal.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/intfloat.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/avstring.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "ffm.h" |
| #include "avio_internal.h" |
| |
| static int ffm_is_avail_data(AVFormatContext *s, int size) |
| { |
| FFMContext *ffm = s->priv_data; |
| int64_t pos, avail_size; |
| ptrdiff_t len; |
| |
| len = ffm->packet_end - ffm->packet_ptr; |
| if (size <= len) |
| return 1; |
| pos = avio_tell(s->pb); |
| if (!ffm->write_index) { |
| if (pos == ffm->file_size) |
| return AVERROR_EOF; |
| avail_size = ffm->file_size - pos; |
| } else { |
| if (pos == ffm->write_index) { |
| /* exactly at the end of stream */ |
| if (ffm->server_attached) |
| return AVERROR(EAGAIN); |
| else |
| return AVERROR_INVALIDDATA; |
| } else if (pos < ffm->write_index) { |
| avail_size = ffm->write_index - pos; |
| } else { |
| avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE); |
| } |
| } |
| avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len; |
| if (size <= avail_size) |
| return 1; |
| else if (ffm->server_attached) |
| return AVERROR(EAGAIN); |
| else |
| return AVERROR_INVALIDDATA; |
| } |
| |
| static int ffm_resync(AVFormatContext *s, uint32_t state) |
| { |
| av_log(s, AV_LOG_ERROR, "resyncing\n"); |
| while (state != PACKET_ID) { |
| if (avio_feof(s->pb)) { |
| av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n"); |
| return -1; |
| } |
| state = (state << 8) | avio_r8(s->pb); |
| } |
| return 0; |
| } |
| |
| /* first is true if we read the frame header */ |
| static int ffm_read_data(AVFormatContext *s, |
| uint8_t *buf, int size, int header) |
| { |
| FFMContext *ffm = s->priv_data; |
| AVIOContext *pb = s->pb; |
| int fill_size, size1, frame_offset; |
| uint32_t id; |
| ptrdiff_t len; |
| int64_t last_pos = -1; |
| |
| size1 = size; |
| while (size > 0) { |
| redo: |
| len = ffm->packet_end - ffm->packet_ptr; |
| if (len < 0) |
| return -1; |
| if (len > size) |
| len = size; |
| if (len == 0) { |
| if (avio_tell(pb) == ffm->file_size) { |
| if (ffm->server_attached) { |
| avio_seek(pb, ffm->packet_size, SEEK_SET); |
| } else |
| return AVERROR_EOF; |
| } |
| retry_read: |
| if (pb->buffer_size != ffm->packet_size) { |
| int64_t tell = avio_tell(pb); |
| int ret = ffio_set_buf_size(pb, ffm->packet_size); |
| if (ret < 0) |
| return ret; |
| avio_seek(pb, tell, SEEK_SET); |
| } |
| id = avio_rb16(pb); /* PACKET_ID */ |
| if (id != PACKET_ID) { |
| if (ffm_resync(s, id) < 0) |
| return -1; |
| last_pos = avio_tell(pb); |
| } |
| fill_size = avio_rb16(pb); |
| ffm->dts = avio_rb64(pb); |
| frame_offset = avio_rb16(pb); |
| avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE); |
| if (ffm->packet_size < FFM_HEADER_SIZE + fill_size || frame_offset < 0) { |
| return -1; |
| } |
| ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size); |
| /* if first packet or resynchronization packet, we must |
| handle it specifically */ |
| if (ffm->first_packet || (frame_offset & 0x8000)) { |
| if (!frame_offset) { |
| /* This packet has no frame headers in it */ |
| if (avio_tell(pb) >= ffm->packet_size * 3LL) { |
| int64_t seekback = FFMIN(ffm->packet_size * 2LL, avio_tell(pb) - last_pos); |
| seekback = FFMAX(seekback, 0); |
| avio_seek(pb, -seekback, SEEK_CUR); |
| goto retry_read; |
| } |
| /* This is bad, we cannot find a valid frame header */ |
| return 0; |
| } |
| ffm->first_packet = 0; |
| if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE) { |
| ffm->packet_end = ffm->packet_ptr; |
| return -1; |
| } |
| ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE; |
| if (!header) |
| break; |
| } else { |
| ffm->packet_ptr = ffm->packet; |
| } |
| goto redo; |
| } |
| memcpy(buf, ffm->packet_ptr, len); |
| buf += len; |
| ffm->packet_ptr += len; |
| size -= len; |
| header = 0; |
| } |
| return size1 - size; |
| } |
| |
| /* ensure that actual seeking happens between FFM_PACKET_SIZE |
| and file_size - FFM_PACKET_SIZE */ |
| static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1) |
| { |
| FFMContext *ffm = s->priv_data; |
| AVIOContext *pb = s->pb; |
| int64_t pos; |
| |
| pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE); |
| pos = FFMAX(pos, FFM_PACKET_SIZE); |
| ff_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos); |
| return avio_seek(pb, pos, SEEK_SET); |
| } |
| |
| static int64_t get_dts(AVFormatContext *s, int64_t pos) |
| { |
| AVIOContext *pb = s->pb; |
| int64_t dts; |
| |
| ffm_seek1(s, pos); |
| avio_skip(pb, 4); |
| dts = avio_rb64(pb); |
| ff_dlog(s, "dts=%0.6f\n", dts / 1000000.0); |
| return dts; |
| } |
| |
| static void adjust_write_index(AVFormatContext *s) |
| { |
| FFMContext *ffm = s->priv_data; |
| AVIOContext *pb = s->pb; |
| int64_t pts; |
| //int64_t orig_write_index = ffm->write_index; |
| int64_t pos_min, pos_max; |
| int64_t pts_start; |
| int64_t ptr = avio_tell(pb); |
| |
| |
| pos_min = 0; |
| pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE; |
| |
| pts_start = get_dts(s, pos_min); |
| |
| pts = get_dts(s, pos_max); |
| |
| if (pts - 100000 > pts_start) |
| goto end; |
| |
| ffm->write_index = FFM_PACKET_SIZE; |
| |
| pts_start = get_dts(s, pos_min); |
| |
| pts = get_dts(s, pos_max); |
| |
| if (pts - 100000 <= pts_start) { |
| while (1) { |
| int64_t newpos; |
| int64_t newpts; |
| |
| newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE; |
| |
| if (newpos == pos_min) |
| break; |
| |
| newpts = get_dts(s, newpos); |
| |
| if (newpts - 100000 <= pts) { |
| pos_max = newpos; |
| pts = newpts; |
| } else { |
| pos_min = newpos; |
| } |
| } |
| ffm->write_index += pos_max; |
| } |
| |
| end: |
| avio_seek(pb, ptr, SEEK_SET); |
| } |
| |
| |
| static int ffm_close(AVFormatContext *s) |
| { |
| int i; |
| |
| for (i = 0; i < s->nb_streams; i++) |
| av_freep(&s->streams[i]->codec->rc_eq); |
| |
| return 0; |
| } |
| |
| static int ffm_append_recommended_configuration(AVStream *st, char **conf) |
| { |
| int ret; |
| size_t newsize; |
| av_assert0(conf && st); |
| if (!*conf) |
| return 0; |
| if (!st->recommended_encoder_configuration) { |
| st->recommended_encoder_configuration = *conf; |
| *conf = 0; |
| return 0; |
| } |
| newsize = strlen(*conf) + strlen(st->recommended_encoder_configuration) + 2; |
| if ((ret = av_reallocp(&st->recommended_encoder_configuration, newsize)) < 0) |
| return ret; |
| av_strlcat(st->recommended_encoder_configuration, ",", newsize); |
| av_strlcat(st->recommended_encoder_configuration, *conf, newsize); |
| av_freep(conf); |
| return 0; |
| } |
| |
| static int ffm2_read_header(AVFormatContext *s) |
| { |
| FFMContext *ffm = s->priv_data; |
| AVStream *st; |
| AVIOContext *pb = s->pb; |
| AVCodecContext *codec; |
| const AVCodecDescriptor *codec_desc; |
| int ret; |
| int f_main = 0, f_cprv = -1, f_stvi = -1, f_stau = -1; |
| AVCodec *enc; |
| char *buffer; |
| |
| ffm->packet_size = avio_rb32(pb); |
| if (ffm->packet_size != FFM_PACKET_SIZE) { |
| av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n", |
| ffm->packet_size, FFM_PACKET_SIZE); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| ffm->write_index = avio_rb64(pb); |
| /* get also filesize */ |
| if (pb->seekable) { |
| ffm->file_size = avio_size(pb); |
| if (ffm->write_index && 0) |
| adjust_write_index(s); |
| } else { |
| ffm->file_size = (UINT64_C(1) << 63) - 1; |
| } |
| |
| while(!avio_feof(pb)) { |
| unsigned id = avio_rb32(pb); |
| unsigned size = avio_rb32(pb); |
| int64_t next = avio_tell(pb) + size; |
| char rc_eq_buf[128]; |
| |
| if(!id) |
| break; |
| |
| switch(id) { |
| case MKBETAG('M', 'A', 'I', 'N'): |
| if (f_main++) { |
| ret = AVERROR(EINVAL); |
| goto fail; |
| } |
| avio_rb32(pb); /* nb_streams */ |
| avio_rb32(pb); /* total bitrate */ |
| break; |
| case MKBETAG('C', 'O', 'M', 'M'): |
| f_cprv = f_stvi = f_stau = 0; |
| st = avformat_new_stream(s, NULL); |
| if (!st) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| |
| avpriv_set_pts_info(st, 64, 1, 1000000); |
| |
| codec = st->codec; |
| /* generic info */ |
| codec->codec_id = avio_rb32(pb); |
| codec_desc = avcodec_descriptor_get(codec->codec_id); |
| if (!codec_desc) { |
| av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codec->codec_id); |
| codec->codec_id = AV_CODEC_ID_NONE; |
| goto fail; |
| } |
| codec->codec_type = avio_r8(pb); |
| if (codec->codec_type != codec_desc->type) { |
| av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n", |
| codec_desc->type, codec->codec_type); |
| codec->codec_id = AV_CODEC_ID_NONE; |
| codec->codec_type = AVMEDIA_TYPE_UNKNOWN; |
| goto fail; |
| } |
| codec->bit_rate = avio_rb32(pb); |
| codec->flags = avio_rb32(pb); |
| codec->flags2 = avio_rb32(pb); |
| codec->debug = avio_rb32(pb); |
| if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) { |
| if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0) |
| return AVERROR(ENOMEM); |
| } |
| break; |
| case MKBETAG('S', 'T', 'V', 'I'): |
| if (f_stvi++) { |
| ret = AVERROR(EINVAL); |
| goto fail; |
| } |
| codec->time_base.num = avio_rb32(pb); |
| codec->time_base.den = avio_rb32(pb); |
| if (codec->time_base.num <= 0 || codec->time_base.den <= 0) { |
| av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n", |
| codec->time_base.num, codec->time_base.den); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| codec->width = avio_rb16(pb); |
| codec->height = avio_rb16(pb); |
| codec->gop_size = avio_rb16(pb); |
| codec->pix_fmt = avio_rb32(pb); |
| codec->qmin = avio_r8(pb); |
| codec->qmax = avio_r8(pb); |
| codec->max_qdiff = avio_r8(pb); |
| codec->qcompress = avio_rb16(pb) / 10000.0; |
| codec->qblur = avio_rb16(pb) / 10000.0; |
| codec->bit_rate_tolerance = avio_rb32(pb); |
| avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf)); |
| codec->rc_eq = av_strdup(rc_eq_buf); |
| codec->rc_max_rate = avio_rb32(pb); |
| codec->rc_min_rate = avio_rb32(pb); |
| codec->rc_buffer_size = avio_rb32(pb); |
| codec->i_quant_factor = av_int2double(avio_rb64(pb)); |
| codec->b_quant_factor = av_int2double(avio_rb64(pb)); |
| codec->i_quant_offset = av_int2double(avio_rb64(pb)); |
| codec->b_quant_offset = av_int2double(avio_rb64(pb)); |
| codec->dct_algo = avio_rb32(pb); |
| codec->strict_std_compliance = avio_rb32(pb); |
| codec->max_b_frames = avio_rb32(pb); |
| codec->mpeg_quant = avio_rb32(pb); |
| codec->intra_dc_precision = avio_rb32(pb); |
| codec->me_method = avio_rb32(pb); |
| codec->mb_decision = avio_rb32(pb); |
| codec->nsse_weight = avio_rb32(pb); |
| codec->frame_skip_cmp = avio_rb32(pb); |
| codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb)); |
| codec->codec_tag = avio_rb32(pb); |
| codec->thread_count = avio_r8(pb); |
| codec->coder_type = avio_rb32(pb); |
| codec->me_cmp = avio_rb32(pb); |
| codec->me_subpel_quality = avio_rb32(pb); |
| codec->me_range = avio_rb32(pb); |
| codec->keyint_min = avio_rb32(pb); |
| codec->scenechange_threshold = avio_rb32(pb); |
| codec->b_frame_strategy = avio_rb32(pb); |
| codec->qcompress = av_int2double(avio_rb64(pb)); |
| codec->qblur = av_int2double(avio_rb64(pb)); |
| codec->max_qdiff = avio_rb32(pb); |
| codec->refs = avio_rb32(pb); |
| break; |
| case MKBETAG('S', 'T', 'A', 'U'): |
| if (f_stau++) { |
| ret = AVERROR(EINVAL); |
| goto fail; |
| } |
| codec->sample_rate = avio_rb32(pb); |
| codec->channels = avio_rl16(pb); |
| codec->frame_size = avio_rl16(pb); |
| break; |
| case MKBETAG('C', 'P', 'R', 'V'): |
| if (f_cprv++) { |
| ret = AVERROR(EINVAL); |
| goto fail; |
| } |
| enc = avcodec_find_encoder(codec->codec_id); |
| if (enc && enc->priv_data_size && enc->priv_class) { |
| buffer = av_malloc(size + 1); |
| if (!buffer) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| avio_get_str(pb, size, buffer, size + 1); |
| if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0) |
| goto fail; |
| } |
| break; |
| case MKBETAG('S', '2', 'V', 'I'): |
| if (f_stvi++ || !size) { |
| ret = AVERROR(EINVAL); |
| goto fail; |
| } |
| buffer = av_malloc(size); |
| if (!buffer) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| avio_get_str(pb, INT_MAX, buffer, size); |
| av_set_options_string(codec, buffer, "=", ","); |
| if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0) |
| goto fail; |
| break; |
| case MKBETAG('S', '2', 'A', 'U'): |
| if (f_stau++ || !size) { |
| ret = AVERROR(EINVAL); |
| goto fail; |
| } |
| buffer = av_malloc(size); |
| if (!buffer) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| avio_get_str(pb, INT_MAX, buffer, size); |
| av_set_options_string(codec, buffer, "=", ","); |
| if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0) |
| goto fail; |
| break; |
| } |
| avio_seek(pb, next, SEEK_SET); |
| } |
| |
| /* get until end of block reached */ |
| while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached) |
| avio_r8(pb); |
| |
| /* init packet demux */ |
| ffm->packet_ptr = ffm->packet; |
| ffm->packet_end = ffm->packet; |
| ffm->frame_offset = 0; |
| ffm->dts = 0; |
| ffm->read_state = READ_HEADER; |
| ffm->first_packet = 1; |
| return 0; |
| fail: |
| ffm_close(s); |
| return ret; |
| } |
| |
| static int ffm_read_header(AVFormatContext *s) |
| { |
| FFMContext *ffm = s->priv_data; |
| AVStream *st; |
| AVIOContext *pb = s->pb; |
| AVCodecContext *codec; |
| const AVCodecDescriptor *codec_desc; |
| int i, nb_streams; |
| uint32_t tag; |
| |
| /* header */ |
| tag = avio_rl32(pb); |
| if (tag == MKTAG('F', 'F', 'M', '2')) |
| return ffm2_read_header(s); |
| if (tag != MKTAG('F', 'F', 'M', '1')) |
| goto fail; |
| ffm->packet_size = avio_rb32(pb); |
| if (ffm->packet_size != FFM_PACKET_SIZE) |
| goto fail; |
| ffm->write_index = avio_rb64(pb); |
| /* get also filesize */ |
| if (pb->seekable) { |
| ffm->file_size = avio_size(pb); |
| if (ffm->write_index && 0) |
| adjust_write_index(s); |
| } else { |
| ffm->file_size = (UINT64_C(1) << 63) - 1; |
| } |
| |
| nb_streams = avio_rb32(pb); |
| avio_rb32(pb); /* total bitrate */ |
| /* read each stream */ |
| for(i=0;i<nb_streams;i++) { |
| char rc_eq_buf[128]; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| goto fail; |
| |
| avpriv_set_pts_info(st, 64, 1, 1000000); |
| |
| codec = st->codec; |
| /* generic info */ |
| codec->codec_id = avio_rb32(pb); |
| codec_desc = avcodec_descriptor_get(codec->codec_id); |
| if (!codec_desc) { |
| av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codec->codec_id); |
| codec->codec_id = AV_CODEC_ID_NONE; |
| goto fail; |
| } |
| codec->codec_type = avio_r8(pb); /* codec_type */ |
| if (codec->codec_type != codec_desc->type) { |
| av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n", |
| codec_desc->type, codec->codec_type); |
| codec->codec_id = AV_CODEC_ID_NONE; |
| codec->codec_type = AVMEDIA_TYPE_UNKNOWN; |
| goto fail; |
| } |
| codec->bit_rate = avio_rb32(pb); |
| codec->flags = avio_rb32(pb); |
| codec->flags2 = avio_rb32(pb); |
| codec->debug = avio_rb32(pb); |
| /* specific info */ |
| switch(codec->codec_type) { |
| case AVMEDIA_TYPE_VIDEO: |
| codec->time_base.num = avio_rb32(pb); |
| codec->time_base.den = avio_rb32(pb); |
| if (codec->time_base.num <= 0 || codec->time_base.den <= 0) { |
| av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n", |
| codec->time_base.num, codec->time_base.den); |
| goto fail; |
| } |
| codec->width = avio_rb16(pb); |
| codec->height = avio_rb16(pb); |
| codec->gop_size = avio_rb16(pb); |
| codec->pix_fmt = avio_rb32(pb); |
| codec->qmin = avio_r8(pb); |
| codec->qmax = avio_r8(pb); |
| codec->max_qdiff = avio_r8(pb); |
| codec->qcompress = avio_rb16(pb) / 10000.0; |
| codec->qblur = avio_rb16(pb) / 10000.0; |
| codec->bit_rate_tolerance = avio_rb32(pb); |
| avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf)); |
| codec->rc_eq = av_strdup(rc_eq_buf); |
| codec->rc_max_rate = avio_rb32(pb); |
| codec->rc_min_rate = avio_rb32(pb); |
| codec->rc_buffer_size = avio_rb32(pb); |
| codec->i_quant_factor = av_int2double(avio_rb64(pb)); |
| codec->b_quant_factor = av_int2double(avio_rb64(pb)); |
| codec->i_quant_offset = av_int2double(avio_rb64(pb)); |
| codec->b_quant_offset = av_int2double(avio_rb64(pb)); |
| codec->dct_algo = avio_rb32(pb); |
| codec->strict_std_compliance = avio_rb32(pb); |
| codec->max_b_frames = avio_rb32(pb); |
| codec->mpeg_quant = avio_rb32(pb); |
| codec->intra_dc_precision = avio_rb32(pb); |
| codec->me_method = avio_rb32(pb); |
| codec->mb_decision = avio_rb32(pb); |
| codec->nsse_weight = avio_rb32(pb); |
| codec->frame_skip_cmp = avio_rb32(pb); |
| codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb)); |
| codec->codec_tag = avio_rb32(pb); |
| codec->thread_count = avio_r8(pb); |
| codec->coder_type = avio_rb32(pb); |
| codec->me_cmp = avio_rb32(pb); |
| codec->me_subpel_quality = avio_rb32(pb); |
| codec->me_range = avio_rb32(pb); |
| codec->keyint_min = avio_rb32(pb); |
| codec->scenechange_threshold = avio_rb32(pb); |
| codec->b_frame_strategy = avio_rb32(pb); |
| codec->qcompress = av_int2double(avio_rb64(pb)); |
| codec->qblur = av_int2double(avio_rb64(pb)); |
| codec->max_qdiff = avio_rb32(pb); |
| codec->refs = avio_rb32(pb); |
| break; |
| case AVMEDIA_TYPE_AUDIO: |
| codec->sample_rate = avio_rb32(pb); |
| codec->channels = avio_rl16(pb); |
| codec->frame_size = avio_rl16(pb); |
| break; |
| default: |
| goto fail; |
| } |
| if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) { |
| if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0) |
| return AVERROR(ENOMEM); |
| } |
| } |
| |
| /* get until end of block reached */ |
| while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached) |
| avio_r8(pb); |
| |
| /* init packet demux */ |
| ffm->packet_ptr = ffm->packet; |
| ffm->packet_end = ffm->packet; |
| ffm->frame_offset = 0; |
| ffm->dts = 0; |
| ffm->read_state = READ_HEADER; |
| ffm->first_packet = 1; |
| return 0; |
| fail: |
| ffm_close(s); |
| return -1; |
| } |
| |
| /* return < 0 if eof */ |
| static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| int size; |
| FFMContext *ffm = s->priv_data; |
| int duration, ret; |
| |
| switch(ffm->read_state) { |
| case READ_HEADER: |
| if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0) |
| return ret; |
| |
| ff_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n", |
| avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size); |
| if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) != |
| FRAME_HEADER_SIZE) |
| return -1; |
| if (ffm->header[1] & FLAG_DTS) |
| if (ffm_read_data(s, ffm->header+16, 4, 1) != 4) |
| return -1; |
| ffm->read_state = READ_DATA; |
| /* fall through */ |
| case READ_DATA: |
| size = AV_RB24(ffm->header + 2); |
| if ((ret = ffm_is_avail_data(s, size)) < 0) |
| return ret; |
| |
| duration = AV_RB24(ffm->header + 5); |
| |
| if (av_new_packet(pkt, size) < 0) { |
| return AVERROR(ENOMEM); |
| } |
| pkt->stream_index = ffm->header[0]; |
| if ((unsigned)pkt->stream_index >= s->nb_streams) { |
| av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index); |
| av_packet_unref(pkt); |
| ffm->read_state = READ_HEADER; |
| return -1; |
| } |
| pkt->pos = avio_tell(s->pb); |
| if (ffm->header[1] & FLAG_KEY_FRAME) |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| |
| ffm->read_state = READ_HEADER; |
| if (ffm_read_data(s, pkt->data, size, 0) != size) { |
| /* bad case: desynchronized packet. we cancel all the packet loading */ |
| av_packet_unref(pkt); |
| return -1; |
| } |
| pkt->pts = AV_RB64(ffm->header+8); |
| if (ffm->header[1] & FLAG_DTS) |
| pkt->dts = pkt->pts - AV_RB32(ffm->header+16); |
| else |
| pkt->dts = pkt->pts; |
| pkt->duration = duration; |
| break; |
| } |
| return 0; |
| } |
| |
| /* seek to a given time in the file. The file read pointer is |
| positioned at or before pts. XXX: the following code is quite |
| approximative */ |
| static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags) |
| { |
| FFMContext *ffm = s->priv_data; |
| int64_t pos_min, pos_max, pos; |
| int64_t pts_min, pts_max, pts; |
| double pos1; |
| |
| ff_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0); |
| /* find the position using linear interpolation (better than |
| dichotomy in typical cases) */ |
| if (ffm->write_index && ffm->write_index < ffm->file_size) { |
| if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) { |
| pos_min = FFM_PACKET_SIZE; |
| pos_max = ffm->write_index - FFM_PACKET_SIZE; |
| } else { |
| pos_min = ffm->write_index; |
| pos_max = ffm->file_size - FFM_PACKET_SIZE; |
| } |
| } else { |
| pos_min = FFM_PACKET_SIZE; |
| pos_max = ffm->file_size - FFM_PACKET_SIZE; |
| } |
| while (pos_min <= pos_max) { |
| pts_min = get_dts(s, pos_min); |
| pts_max = get_dts(s, pos_max); |
| if (pts_min > wanted_pts || pts_max <= wanted_pts) { |
| pos = pts_min > wanted_pts ? pos_min : pos_max; |
| goto found; |
| } |
| /* linear interpolation */ |
| pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) / |
| (double)(pts_max - pts_min); |
| pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE; |
| if (pos <= pos_min) |
| pos = pos_min; |
| else if (pos >= pos_max) |
| pos = pos_max; |
| pts = get_dts(s, pos); |
| /* check if we are lucky */ |
| if (pts == wanted_pts) { |
| goto found; |
| } else if (pts > wanted_pts) { |
| pos_max = pos - FFM_PACKET_SIZE; |
| } else { |
| pos_min = pos + FFM_PACKET_SIZE; |
| } |
| } |
| pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max; |
| |
| found: |
| if (ffm_seek1(s, pos) < 0) |
| return -1; |
| |
| /* reset read state */ |
| ffm->read_state = READ_HEADER; |
| ffm->packet_ptr = ffm->packet; |
| ffm->packet_end = ffm->packet; |
| ffm->first_packet = 1; |
| |
| return 0; |
| } |
| |
| static int ffm_probe(AVProbeData *p) |
| { |
| if ( |
| p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' && |
| (p->buf[3] == '1' || p->buf[3] == '2')) |
| return AVPROBE_SCORE_MAX + 1; |
| return 0; |
| } |
| |
| static const AVOption options[] = { |
| {"server_attached", NULL, offsetof(FFMContext, server_attached), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_EXPORT }, |
| {"ffm_write_index", NULL, offsetof(FFMContext, write_index), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, 1, AV_OPT_FLAG_EXPORT }, |
| {"ffm_file_size", NULL, offsetof(FFMContext, file_size), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, 1, AV_OPT_FLAG_EXPORT }, |
| { NULL }, |
| }; |
| |
| static const AVClass ffm_class = { |
| .class_name = "ffm demuxer", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| AVInputFormat ff_ffm_demuxer = { |
| .name = "ffm", |
| .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"), |
| .priv_data_size = sizeof(FFMContext), |
| .read_probe = ffm_probe, |
| .read_header = ffm_read_header, |
| .read_packet = ffm_read_packet, |
| .read_close = ffm_close, |
| .read_seek = ffm_seek, |
| .priv_class = &ffm_class, |
| }; |
